JP4281368B2 - Abrasion resistant spray coating - Google Patents
Abrasion resistant spray coating Download PDFInfo
- Publication number
- JP4281368B2 JP4281368B2 JP2003022860A JP2003022860A JP4281368B2 JP 4281368 B2 JP4281368 B2 JP 4281368B2 JP 2003022860 A JP2003022860 A JP 2003022860A JP 2003022860 A JP2003022860 A JP 2003022860A JP 4281368 B2 JP4281368 B2 JP 4281368B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- spray coating
- less
- thermal spray
- wear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005507 spraying Methods 0.000 title claims description 51
- 238000005299 abrasion Methods 0.000 title claims description 12
- 239000000843 powder Substances 0.000 claims description 92
- 238000000576 coating method Methods 0.000 claims description 46
- 239000011248 coating agent Substances 0.000 claims description 45
- 239000000203 mixture Substances 0.000 claims description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 26
- 229910052750 molybdenum Inorganic materials 0.000 claims description 24
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 23
- 229910000423 chromium oxide Inorganic materials 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 21
- 239000011651 chromium Substances 0.000 claims description 20
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 claims description 20
- 229910003470 tongbaite Inorganic materials 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 19
- 238000007751 thermal spraying Methods 0.000 claims description 19
- 229910002804 graphite Inorganic materials 0.000 claims description 15
- 239000010439 graphite Substances 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- 229910052748 manganese Inorganic materials 0.000 claims description 12
- 230000003746 surface roughness Effects 0.000 claims description 11
- 229910052717 sulfur Inorganic materials 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- 238000009689 gas atomisation Methods 0.000 claims description 3
- 238000009692 water atomization Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 50
- 229910017116 Fe—Mo Inorganic materials 0.000 description 18
- 238000012360 testing method Methods 0.000 description 18
- 239000002245 particle Substances 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000007747 plating Methods 0.000 description 6
- 229910001018 Cast iron Inorganic materials 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 4
- 238000007750 plasma spraying Methods 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910017112 Fe—C Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- UOUJSJZBMCDAEU-UHFFFAOYSA-N chromium(3+);oxygen(2-) Chemical group [O-2].[O-2].[O-2].[Cr+3].[Cr+3] UOUJSJZBMCDAEU-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Images
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Coating By Spraying Or Casting (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、ＦｅとＭｏを主成分とする溶射皮膜において軟質相（グラファイト）あるいは硬質相（酸化クロム、炭化クロム）を分散させた多相混合組織を有する溶射皮膜に関するものである。
【０００２】
【従来の技術】
従来の技術としては、基材の摺動面に、摩耗層（硬質層）、必要に応じて中間層、さらに擦り合わせ層（軟質層）を形成させた層状の組織構造を有する被膜が知られている。硬質層としては、炭化クロムや酸化クロム等の硬質粒子が埋め込まれたクロム、ニッケル、モリブデンが挙げられ、軟質層としては、モリブデン、アルミニウム、銀、ニッケル等で被覆されたグラファイトからなるものが挙げられている（例えば、特許文献１参照）。また、ＦｅとＭｏからなるコーティングを溶射する技術も公知である（例えば、特許文献２参照）。
【０００３】
【特許文献１】
特表平９−５０８６８８号公報
【特許文献２】
特表平１１−５１５０５７号公報
【０００４】
【発明が解決しようとする課題】
上記のように、金属で被覆されたグラファイト粉末を溶射する技術（例えば、特許文献１参照）は知られているが、硬質層の上に金属で被覆されたグラファイトを軟質層として溶射するもので、硬質層、軟質層が完全な層状になった組織構造の被膜であり、耐摩耗性、耐焼付き性、初期なじみ性等といった複合的な性質には改善の余地があるものと考えられる。また、この技術は、本発明の混合組織構造とは異なっている。さらに、材料系が本発明のＦｅ−Ｍｏ系とは異なっている。
【０００５】
また、上記のように、Ｆｅ−Ｍｏ系溶射皮膜（例えば、特許文献２参照）は公知であるが、Ｆｅ系部分とＭｏの２相混合組織構造であり、耐摩耗性、耐焼付き性、初期なじみ性等に問題があると考えられる。また、この溶射皮膜は、本発明のＦｅ系部分とＭｏ部分と軟質相部分、あるいはＦｅ系部分とＭｏ部分と硬質相部分といった３相の混合組織構造とは、組織構造が異なっている。
【０００６】
摺動部分、特に、エンジンのシリンダボアは、耐摩耗性、耐焼付き性、初期なじみ性等といった複合的な特性が要求される。本発明は上記の諸点に鑑みなされたもので、本発明の目的は、軟質相（グラファイト）を分散させたＦｅ−Ｍｏ系溶射皮膜、あるいは硬質相（酸化クロム、炭化クロム）を分散させたＦｅ−Ｍｏ系溶射皮膜とすることで、摺動部での耐摩耗性、耐焼付き性、初期なじみ性等といった複合的な特性を向上させるようにした溶射皮膜を提供することにある。
【０００７】
【課題を解決するための手段】
上記の目的を達成するために、本発明の耐摩耗溶射皮膜は、Ｆｅ及びＭｏを主成分とし、軟質相としてグラファイトを分散させた溶射皮膜であって、Ｆｅ系部分とＭｏ部分と軟質相部分とからなる多相混合組織を有するように構成されている。この場合、Ｆｅ系部分、Ｍｏ部分、軟質相部分の混合組織状態とし、表面組織状態（摺動面の組織状態）は体積比率でＦｅ系部分３０〜８０％、Ｍｏ１０〜６０％、軟質相５〜３０％の組成範囲とすることが好ましい。
【０００８】
また、本発明の耐摩耗溶射皮膜は、Ｆｅ及びＭｏを主成分とし、硬質相として酸化クロム又は炭化クロムを分散させた溶射皮膜であって、Ｆｅ系部分とＭｏ部分と硬質相部分とからなる多相混合組織を有することを特徴としている。この場合、Ｆｅ系部分、Ｍｏ部分、硬質相部分の混合組織状態とし、表面組織状態（摺動面の組織状態）は体積比率でＦｅ系部分３０〜８０％、Ｍｏ１０〜６０％、硬質相１０〜３０％の組成範囲とすることが好ましい。
【０００９】
軟質相を分散させた溶射皮膜において、表面組織として平面的に見た１つのＭｏの大きさ（長さ）は１０〜１００μm、１つの軟質相の大きさ（長さ）は３０〜１００μmとすることが好ましい。また、硬質相を分散させた溶射皮膜において、表面組織として平面的に見た１つのＭｏの大きさ（長さ）は１０〜１００μm、１つの硬質相の大きさ（長さ）は１０〜５０μmとすることが好ましい。混合組織皮膜の気孔率は体積率で１〜１０％とすることが好ましい。また、軟質相を分散させた溶射皮膜において、混合組織皮膜の平均硬さは２００〜５００HV（ビッカース硬さ）とし、各組織相では、Ｆｅ系部分の硬さ４００〜８００HV、Ｍｏ部分の硬さ３００〜５００HVとすることが好ましい。また、硬質相を分散させた溶射皮膜において、混合組織皮膜の平均硬さは３００〜６００HVとし、各組織相では、Ｆｅ系部分の硬さ４００〜８００HV、Ｍｏ部分の硬さ３００〜５００HV、硬質相部分の硬さ５００〜９００HVとすることが好ましい。これらの本発明において、溶射したときの皮膜の膜厚は１００〜３００μmとすることが好ましい。さらに、溶射後、加工により仕上げたときの膜厚は５０〜２００μm、表面粗さは算術平均粗さＲaで０．１〜０．６μmとすることが好ましい。算術平均粗さＲaとは、粗さ曲線からその平均線の方向に基準長さだけ抜き取り、この抜取り部分の平均線の方向にＸ軸を、縦倍率の方向にＹ軸を取り、粗さ曲線をｙ＝ｆ（ｘ）で表したときに、下記の数１に示す式によって求められる値をマイクロメートル（μm）で表したものをいう。下記の数１に示す式において、ｌは基準長さで
ある。
【００１０】
【数１】
本発明において、溶射に用いる粉末は、Ｆｅに対してＣが０．４０〜１．００wt％、Ｓｉが０．１５〜０．３５wt％、Ｍｎが０．３０〜０．９０wt％、Ｐが０．０３０wt％以下、Ｓが０．０３５wt％以下の組成を有する粉末、又は、Ｆｅに対してＣが０．４０〜１．００wt％、Ｓｉが１．２０〜１．６０wt％、Ｍｎが０．５０〜０．８０wt％、Ｐが０．０２５wt％以下、Ｓが０．０２５wt％以下、Ｃｒが０．５０〜０．８０wt％の組成を有する粉末、又は、Ｆｅに対してＣが１．１５〜１．２５wt％、Ｓｉが０．４５wt％以下、Ｍｎが０．４０wt％以下、Ｐが０．０３０wt％以下、Ｓが０．０３０wt％以下、Ｃｒが３．８０〜４．５０wt％、Ｍｏが４．７０〜５．２０wt％、Ｗが５．９０〜６．７０wt％、Ｖが２．７０〜３．２０wt％の組成を有する粉末を、水アトマイズ法又はガスアトマイズ法により処理して作製したＦｅ系粉末とし、粒子径は３０〜７０μmとすることが好ましい。また、溶射に用いる粉末は、Ｍｏ及び不可避的不純物元素（Ｃ、Ｏ、Ｓｉ、Ｆｅ等）からなる１〜１０μmの粉末を造粒焼結して作製したＭｏ粉末とし、粒子径は５０〜１００μmとすることが好ましい。また、溶射に用いる粉末は、グラファイトをＭｏ又はＮｉにより膜厚１〜１０μmで被覆したグラファイト粉末とし、粒子径は３０〜９０μmとすることが好ましい。また、溶射に用いる粉末は、１〜１０μmの酸化クロム粉末又は炭化クロム粉末と１〜１０μmのＭｏ粉末を造粒焼結して作製した酸化クロム粉末又は炭化クロム粉末とし、粒子径は１０〜７０μmとすることが好ましい。
【００１２】
また、本発明においては、皮膜を形成させる基材表面にブラスト処理を行い、粗面化後の表面粗さが算術平均粗さＲaで３．０μm以上となる前処理を行うことが好ましい。
また、本発明の耐摩耗溶射皮膜は、大気プラズマ溶射により基材表面に作製することが好ましい。この場合、溶射に用いる粉末を溶射ガンにて供給するに際し、それぞれ別々の供給口から供給するか、全部混合して１つの供給口から供給するか、又は２種類を混合したものと他の１種類とを別々の供給口から供給するようにして作製することが好ましい。
【００１３】
【発明の実施の形態】
以下、本発明の実施の形態を説明するが、本発明は下記の実施の形態に何ら限定されるものではなく、適宜変更して実施することが可能なものである。
▲１▼ 本発明は、Ｆｅ系部分とＭｏ部分と軟質相部分（グラファイト）といった多相混合組織を有する皮膜とし、耐摩耗性、耐焼付き性に優れた溶射皮膜としたものである。また、本発明は、Ｆｅ系部分とＭｏ部分と硬質相部分（酸化クロムあるいは炭化クロム）といった多相混合組織を有する皮膜とし、耐摩耗性、耐焼付き性に優れた溶射皮膜としたものである。なお、酸化クロムには、Ｃｒ2Ｏ3、Ｃｒ3Ｏ4等があり、炭化クロムには、Ｃｒ3Ｃ2、Ｃｒ7Ｃ3、Ｃｒ23Ｃ6等がある。
【００１４】
▲２▼ 溶射皮膜の作製方法
１） 使用する溶射粉末
Ｆｅ粉末としては、Ｆｅに対して、Ｃが０．４０〜１．００wt％、Ｓｉが０．１５〜０．３５wt％、Ｍｎが０．３０〜０．９０wt％、Ｐが０．０３０wt％以下、Ｓが０．０３５wt％以下の組成のもの、あるいは、Ｆｅ−Ｃ系に、焼戻し軟化抵抗を付与するために、ＳｉやＭｎを添加したもの、例えば、Ｆｅに対して、Ｃ：０．４０〜１．００wt％、Ｓｉ：１．２０〜１．６０wt％、Ｍｎ：０．５０〜０．８０wt％、Ｐ：０．０２５wt％以下、Ｓ：０．０２５wt％以下、Ｃｒ：０．５０〜０．８０wt％の組成のもの、あるいは、合金元素を添加し高温強度、耐摩耗性を向上させたもの、例えば、Ｆｅに対して、Ｃ：１．１５〜１．２５wt％、Ｓｉ：０．４５wt％以下、Ｍｎ：０．４０wt％以下、Ｐ：０．０３０wt％以下、Ｓ：０．０３０wt％以下、Ｃｒ：３．８０〜４．５０wt％、Ｍｏ：４．７０〜５．２０wt％、Ｗ：５．９０〜６．７０wt％、Ｖ：２．７０〜３．２０wt％の組成のものとする。このような組成のＦｅ粉末を水アトマイズ法又はガスアトマイズ法により処理して、溶射に用いる粉末を作製する。粒子径は３０〜７０μmとする。Ｍｏ粉末は、Ｍｏ及び不可避的不純物元素（不可避的不純物元素とは、Ｃ、Ｏ、Ｓｉ、Ｆｅ等である）からなる１〜１０μmの粉末を造粒焼結して作製する。粒子径は５０〜１００μmとする。軟質相を形成する粉末であるグラファイト粉末は、グラファイトをＭｏあるいはＮｉで膜厚１〜１０μmで被覆した粉末である。粒子径は３０〜９０μmとする。硬質相を形成する粉末である酸化クロム粉末（あるいは炭化クロム粉末）は、１〜１０μmの酸化クロム粉末（あるいは炭化クロム粉末）と１〜１０μmのＭｏ粉末の造粒焼結粉末として作製する。粒子径は１０〜７０μmとする。
【００１５】
２） 前処理
溶射の前処理として、Ａｌ2Ｏ3研削材を用いて、皮膜を形成させる基材表面にブラスト処理を行い、粗面化後の表面粗さが算術平均粗さＲaで３．０μm以上となる処理を行う。
【００１６】
３） 溶射粉末供給方法
多相混合組織構造のＦｅ−Ｍｏ系皮膜は大気プラズマ溶射法で作製する。Ｆｅ系粉末及びＭｏ粉末と、軟質相組成粉末（グラファイト粉末）又は硬質相組成粉末（酸化クロム粉末あるいは炭化クロム粉末）を目標とする組成になるよう調製し、以下のような粉末供給方法により、粉末供給口からプラズマガンに粉末を供給することで溶射皮膜の組成を管理する。
ａ） 軟質相を分散させたＦｅ−Ｍｏ系溶射皮膜
ア） Ｆｅ系粉末とＭｏ粉末とグラファイト粉末をそれぞれ別々の供給口から供給する。
イ） Ｆｅ系粉末とＭｏ粉末を混合したものと、グラファイト粉末を別々の供給口から供給する。
ウ） Ｆｅ系粉末とグラファイト粉末を混合したものと、Ｍｏ粉末を別々の供給口から供給する。
エ） Ｍｏ粉末とグラファイト粉末を混合したものと、Ｆｅ系粉末を別々の供給口から供給する。
オ） Ｆｅ系粉末とＭｏ粉末とグラファイト粉末を混合したものを１つの供給口から供給する。
のいずれかの方法で粉末を供給し、皮膜を作製する。
【００１７】
ｂ） 硬質相を分散させたＦｅ−Ｍｏ系溶射皮膜
ア） Ｆｅ系粉末とＭｏ粉末と酸化クロム粉末（あるいは炭化クロム粉末）をそれぞれ別々の供給口から供給する。
イ） Ｆｅ系粉末とＭｏ粉末を混合したものと、酸化クロム粉末（あるいは炭化クロム粉末）を別々の供給口から供給する。
ウ） Ｆｅ系粉末と酸化クロム粉末（あるいは炭化クロム粉末）を混合したものと、Ｍｏ粉末を別々の供給口から供給する。
エ） Ｍｏ粉末と酸化クロム粉末（あるいは炭化クロム粉末）を混合したものと、Ｆｅ系粉末を別々の供給口から供給する。
オ） Ｆｅ系粉末とＭｏ粉末と酸化クロム粉末（あるいは炭化クロム粉末）を混合したものを１つの供給口から供給する。
のいずれかの方法で粉末を供給し、皮膜を作製する。
【００１８】
▲３▼ 皮膜の組織構造
ａ） 軟質相を分散させたＦｅ−Ｍｏ系溶射皮膜の組織構造
Ｆｅ系部分、Ｍｏ部分、軟質相部分の混合組織状態の皮膜とし、摺動面の組織状態（表面組織状態）は、Ｆｅ系部分：３０〜８０％、Ｍｏ：１０〜６０％、軟質相：５〜３０％の体積比率の組成範囲とする。表面組織として平面的に見た１つのＭｏの大きさ（長さ）は１０〜１００μm、１つの軟質相の大きさ（長さ）は３０〜１００μmとする。残部がＦｅ系部分である。また、混合組織皮膜の気孔率は、体積率で１〜１０％とする。平均硬さは２００〜５００HVとし、各組織相の硬さは、Ｆｅ系部分の硬さが４００〜８００HV、Ｍｏ部分の硬さが３００〜５００HVとする。溶射皮膜の膜厚は１００〜３００μmとする。
【００１９】
ｂ） 硬質相を分散させたＦｅ−Ｍｏ系溶射皮膜の組織構造
Ｆｅ系部分、Ｍｏ部分、硬質相部分の混合組織状態の皮膜とし、摺動面の組織状態（表面組織状態）は、Ｆｅ系部分：３０〜８０％、Ｍｏ：１０〜６０％、硬質相：１０〜３０％の体積比率の組成範囲とする。表面組織として平面的に見た１つのＭｏの大きさ（長さ）は１０〜１００μm、１つの硬質相の大きさ（長さ）は１０〜５０μmとする。残部がＦｅ系部分である。また、混合組織皮膜の気孔率は、体積率で１〜１０％とする。平均硬さは３００〜６００HVとし、各組織相の硬さは、Ｆｅ系部分の硬さが４００〜８００HV、Ｍｏ部分の硬さが３００〜５００HV、硬質相部分の硬さが５００〜９００HVとする。溶射皮膜の膜厚は１００〜３００μmとする。
【００２０】
▲４▼ 皮膜の仕上げ方法
軟質相を分散させたＦｅ−Ｍｏ系溶射皮膜、硬質相を分散させたＦｅ−Ｍｏ系溶射皮膜どちらも、溶射後、加工（一例として、ホーニング加工）により、膜厚は５０〜２００μm、表面粗さは算術平均粗さＲaで０．１〜０．６μmに仕上げる。
▲５▼ 本発明の溶射皮膜は、様々な摺動部で用いることが可能である。特に、エンジンのシリンダボア内面に適用すること等が有効である。
【００２１】
【実施例】
▲１▼ 軟質相を分散させたＦｅ−Ｍｏ系溶射皮膜の実施例（実施例１）
１） 溶射皮膜の作製方法と皮膜の組織構造
溶射粉末は下記の表１に示す組成、粒径、作製方法の溶射粉末を用いた。溶射の前処理として、Ａｌ2Ｏ3研削材を用いて、皮膜を形成させる基材表面にブラスト処理を行い、表面粗さがＲaで３．０μm以上となるようにした。大気プラズマ溶射法を用いて、表２に示す条件で溶射を行い、膜厚が２００μmの皮膜を作製した。その後、溶射皮膜を研磨し、膜厚が１００μm、皮膜の表面粗さをＲa０．０７〜０．２μmとした。溶射皮膜の表面組織構造は、図１に示す組織構造（表面組織構造が良く分かるようにするために、本写真は、表面粗さがＲa０．０５μm以下となるように仕上げてある）であり、皮膜の体積比率は、Ｆｅ系部分：６０％、Ｍｏ組織部分：３０％、グラファイト部分：１０％である。なお、溶射皮膜の表面組織は、図２に示す断面組織の模式図において、皮膜表面を図２に示すような位置から観察したものである。１０は基材、１２は溶射皮膜である。
【００２２】
【表１】
【表２】
２） 皮膜の評価方法
往復動摩耗試験機を用いて、表３に示す試験条件で耐焼付き性と耐摩耗性を評価した。耐焼付き性試験を実施する方法の概念図を図４に、耐摩耗性試験を実施する方法の概念図を図５に示す。耐焼付き性は、油膜切れ状態を模擬した潤滑条件での、荷重増加試験により評価した。一方、耐摩耗性は、潤滑油を滴下した潤滑条件での、一定荷重試験により評価した。相手材のピン試験片には、表面がＣｒめっきとＣｒＮ皮膜のもの２種類を用いている。Ｃｒめっきの膜厚は１００μmで、硬さは１０００HVである。ＣｒＮ皮膜は、アークイオンプレーティング法で作製しており、膜厚は４０μmで、硬さは１５００HVである。
本実施例の皮膜の比較材として、鋳鉄とＣｒめっき（相手材）の組合せを用いた。なお、鋳鉄とＣｒめっきの組合せは、現状材でのシリンダライナとピストンリングの摺動を模擬したものである。鋳鉄の組成は、Ｆｅ−３．２５Ｃ−２．２２Ｓｉ−０．７４Ｍｎ−０．１５Ｐ−０．０２２Ｓ−０．１４Ｃｒ−０．２４Ｃｕである。基地が微細なパーライト組織で、片状黒鉛、炭化物が均等に分散した組織構造である。
【００２５】
【表３】
３） 皮膜の評価結果
表３に示す試験条件で焼付き試験を行った結果を図６に、摩耗試験を行った結果を図７に示す。本実施例の軟質相（グラファイト）を分散させたＦｅ−Ｍｏ系溶射皮膜とＣｒＮ皮膜（相手材）との組合せは、比較材の鋳鉄とＣｒめっき（相手材）の組合せの８倍以上の焼付き荷重を示した。また、本実施例の軟質相（グラファイト）を分散させたＦｅ−Ｍｏ系溶射皮膜とＣｒＮ皮膜（相手材）との組合せでの摩耗試験における摩耗量は、比較材の鋳鉄とＣｒめっき（相手材）の組合せでの試験における摩耗量の１／６以下であった。
【００２７】
▲２▼ 硬質相を分散させたＦｅ−Ｍｏ系溶射皮膜の実施例（実施例２）
１） 溶射皮膜の作製方法と皮膜の組織構造
溶射粉末は下記の表４に示す組成、粒径、作製方法の溶射粉末を用いた。溶射の前処理として、Ａｌ2Ｏ3研削材を用いて、皮膜を形成させる基材表面にブラスト処理を行い、表面粗さがＲaで３．０μm以上となるようにした。大気プラズマ溶射法を用いて、表５に示す条件で溶射を行い、膜厚が２００μmの皮膜を作製した。その後、溶射皮膜を研磨し、膜厚が１００μm、皮膜の表面粗さをＲa０．０７〜０．２μmとした。溶射皮膜の表面組織構造は、図３に示す組織構造（表面組織構造が良く分かるようにするために、本写真は、表面粗さがＲa０．０５μm以下となるように仕上げてある）であり、皮膜の体積比率は、Ｆｅ系部分：６０％、Ｍｏ組織部分：１０％、酸化クロム部分：３０％である。
【００２８】
【表４】
【表５】
２） 皮膜の評価方法
上述した表３に示す試験条件で耐焼付き性、耐摩耗性を評価した。比較材も同じである。
３） 皮膜の評価結果
表３に示す試験条件で焼付き試験を行った結果を図６に、摩耗試験を行った結果を図７に示す。本実施例の硬質相（酸化クロム）を分散させたＦｅ−Ｍｏ系溶射皮膜とＣｒＮ皮膜（相手材）との組合せは、比較材の鋳鉄とＣｒめっき（相手材）の組合せの５倍以上の焼付き荷重を示した。また、本実施例の硬質相（酸化クロム）を分散させたＦｅ−Ｍｏ系溶射皮膜とＣｒＮ皮膜（相手材）との組合せでの摩耗試験における摩耗量は、摩耗量の測定が不可能なほど微量であった。
【００３１】
【発明の効果】
本発明は上記のように構成されているので、つぎのような効果を奏する。
（１） ＦｅとＭｏを主成分とする溶射皮膜において軟質相（グラファイト）あるいは硬質相（酸化クロム、炭化クロム）を分散させた多相混合組織を有する溶射皮膜とすることで、摺動部での耐摩耗性、耐焼付き性、初期なじみ性等といった複合的な性質を向上させることができる。
（２） 本発明の溶射皮膜は、様々な摺動部で用いることが可能である。特に、エンジンのシリンダボア内面に適用すること等が有効である。
【図面の簡単な説明】
【図１】本発明の実施例１における耐摩耗溶射皮膜（軟質相（グラファイト）を分散させたＦｅ−Ｍｏ系溶射皮膜）の表面組織を示す走査型電子顕微鏡で撮影した写真である（倍率１００倍）。
【図２】耐摩耗溶射皮膜の断面組織の一例を示す模式図であり、溶射皮膜の表面組織の観察位置を示している。
【図３】本発明の実施例２における耐摩耗溶射皮膜（硬質相（酸化クロム）を分散させたＦｅ−Ｍｏ系溶射皮膜）の表面組織を示す走査型電子顕微鏡で撮影した写真である（倍率１００倍）。
【図４】本発明の実施例で用いる耐焼付き性を評価するための試験方法を説明する概念図である。
【図５】本発明の実施例で用いる耐摩耗性を評価するための試験方法を説明する概念図である。
【図６】本発明の実施例における耐焼付き性の試験結果を示すグラフである。
【図７】本発明の実施例における耐摩耗性の試験結果を示すグラフである。
【符号の説明】
１０ 基材
１２ 溶射皮膜[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thermal spray coating having a multiphase mixed structure in which a soft phase (graphite) or a hard phase (chromium oxide, chromium carbide) is dispersed in a thermal spray coating mainly composed of Fe and Mo.
[0002]
[Prior art]
As a conventional technique, a coating having a layered structure in which a wear layer (hard layer), an intermediate layer, and a rubbing layer (soft layer) are formed on a sliding surface of a base material is known. ing. Examples of the hard layer include chromium, nickel, and molybdenum in which hard particles such as chromium carbide and chromium oxide are embedded. Examples of the soft layer include those made of graphite coated with molybdenum, aluminum, silver, nickel, and the like. (For example, refer to Patent Document 1). Further, a technique for thermally spraying a coating made of Fe and Mo is also known (see, for example, Patent Document 2).
[0003]
[Patent Document 1]
Japanese Patent Publication No. 9-508688 [Patent Document 2]
Japanese National Patent Publication No. 11-515057
[Problems to be solved by the invention]
As described above, a technique for spraying graphite powder coated with metal (for example, refer to Patent Document 1) is known. However, graphite coated with metal on a hard layer is sprayed as a soft layer. It is considered that there is room for improvement in composite properties such as wear resistance, seizure resistance, initial conformability, etc. This technique is also different from the mixed tissue structure of the present invention. Furthermore, the material system is different from the Fe—Mo system of the present invention.
[0005]
Further, as described above, the Fe—Mo-based sprayed coating (for example, see Patent Document 2) is known, but has a two-phase mixed structure structure of Fe-based part and Mo, and has wear resistance, seizure resistance, and initial stage. There seems to be a problem with familiarity. Further, this thermal spray coating has a different structure from the three-phase mixed structure of the present invention, such as the Fe-based part, the Mo part, and the soft phase part, or the Fe-based part, the Mo part, and the hard phase part.
[0006]
Sliding parts, particularly cylinder bores of engines, are required to have a combination of characteristics such as wear resistance, seizure resistance, and initial conformability. The present invention has been made in view of the above points, and an object of the present invention is to provide an Fe—Mo-based thermal spray coating in which a soft phase (graphite) is dispersed, or Fe in which a hard phase (chromium oxide, chromium carbide) is dispersed. The object of the present invention is to provide a sprayed coating in which composite characteristics such as wear resistance, seizure resistance, initial conformability, etc. at the sliding portion are improved by using a Mo-based sprayed coating.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the wear-resistant thermal spray coating of the present invention is a thermal spray coating in which Fe and Mo are the main components and graphite is dispersed as a soft phase, and includes an Fe-based portion, an Mo portion, and a soft phase portion. It is comprised so that it may have the multiphase mixed structure which consists of. In this case, the mixed structure of the Fe-based part, the Mo part, and the soft phase part is used, and the surface texture state (sliding surface texture state) is 30 to 80% Fe-based part, 10 to 60% Mo, and the soft phase 5 by volume ratio. A composition range of ˜30% is preferable.
[0008]
Further, the abrasion-resistant sprayed coating of the present invention is a sprayed coating in which Fe and Mo are main components and chromium oxide or chromium carbide is dispersed as a hard phase, and consists of an Fe-based portion, a Mo portion, and a hard phase portion. It is characterized by having a multiphase mixed structure. In this case, the mixed structure state of the Fe-based part, the Mo part, and the hard phase part is used, and the surface structure state (sliding surface texture state) is Fe-based part 30 to 80%,
[0009]
In the thermal spray coating in which the soft phase is dispersed, the size (length) of one Mo viewed in a plane as the surface structure is 10 to 100 μm, and the size (length) of one soft phase is 30 to 100 μm. It is preferable. Further, in the thermal spray coating in which the hard phase is dispersed, the size (length) of one Mo viewed in a plane as the surface structure is 10 to 100 μm, and the size (length) of one hard phase is 10 to 50 μm. It is preferable that The porosity of the mixed tissue film is preferably 1 to 10% by volume. Moreover, in the thermal spray coating in which the soft phase is dispersed, the average hardness of the mixed structure coating is 200 to 500 HV (Vickers hardness), and in each structure phase, the hardness of the Fe-based portion is 400 to 800 HV and the hardness of the Mo portion. 300 to 500 HV is preferable. In the thermal spray coating in which the hard phase is dispersed, the average hardness of the mixed structure film is 300 to 600 HV, and in each structure phase, the hardness of the Fe-based portion is 400 to 800 HV, the hardness of the Mo portion is 300 to 500 HV, The hardness of the phase portion is preferably 500 to 900 HV. In these present inventions, the thickness of the film when sprayed is preferably 100 to 300 μm. Further, after spraying, the film thickness when finished by processing is preferably 50 to 200 μm, and the surface roughness is preferably an arithmetic average roughness Ra of 0.1 to 0.6 μm. Arithmetic average roughness Ra is a roughness curve extracted from the roughness curve by a reference length in the direction of the average line, taking the X axis in the direction of the average line of the extracted portion and the Y axis in the direction of the vertical magnification. When y is expressed as y = f (x), the value obtained by the following
[0010]
[Expression 1]
In the present invention, the powder used for thermal spraying is 0.40 to 1.00 wt% of C, 0.15 to 0.35 wt% of Si, 0.30 to 0.90 wt% of Mn, and 0 P of Fe with respect to Fe. 0.030 wt% or less, S having a composition of 0.035 wt% or less, or C with respect to Fe of 0.40 to 1.00 wt%, Si of 1.20 to 1.60 wt%, and Mn of 0.1%. Powder having a composition of 50 to 0.80 wt%, P of 0.025 wt% or less, S of 0.025 wt% or less, Cr of 0.50 to 0.80 wt%, or C with respect to Fe of 1.15 ~ 1.25 wt%, Si 0.45 wt% or less, Mn 0.40 wt% or less, P 0.030 wt% or less, S 0.030 wt% or less, Cr 3.80 to 4.50 wt%, Mo Having a composition of 4.70 to 5.20 wt%, W of 5.90 to 6.70 wt%, and V of 2.70 to 3.20 wt%. An Fe-based powder produced by treatment by a water atomizing method or a gas atomizing method, and a particle diameter of 30 to 70 μm is preferable. The powder used for thermal spraying is Mo powder prepared by granulating and sintering 1-10 μm powder composed of Mo and inevitable impurity elements (C, O, Si, Fe, etc.), and the particle diameter is 50-100 μm. It is preferable that Moreover, it is preferable that the powder used for thermal spraying is the graphite powder which coat | covered the graphite with the film thickness of 1-10 micrometers by Mo or Ni, and makes a particle diameter 30-90 micrometers. The powder used for thermal spraying is chromium oxide powder or chromium carbide powder produced by granulating and sintering 1 to 10 μm chromium oxide powder or chromium carbide powder and 1 to 10 μm Mo powder, and the particle size is 10 to 70 μm. It is preferable that
[0012]
In the present invention, it is preferable to perform a blast treatment on the surface of the substrate on which the film is to be formed, and to perform a pretreatment so that the surface roughness after the roughening becomes an arithmetic average roughness Ra of 3.0 μm or more.
Moreover, it is preferable to produce the abrasion-resistant thermal spray coating of the present invention on the substrate surface by atmospheric plasma spraying. In this case, when supplying the powder used for thermal spraying with a thermal spray gun, each is supplied from a separate supply port, or all are mixed and supplied from one supply port, or a mixture of two types and another 1 It is preferable that the types are prepared so as to be supplied from separate supply ports.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below, but the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications.
(1) The present invention is a coating having a multiphase mixed structure such as an Fe-based portion, a Mo portion, and a soft phase portion (graphite), and is a sprayed coating excellent in wear resistance and seizure resistance. Further, the present invention is a coating having a multiphase mixed structure such as an Fe-based portion, a Mo portion, and a hard phase portion (chromium oxide or chromium carbide), and a sprayed coating having excellent wear resistance and seizure resistance. . Note that chromium oxide includes Cr 2 O 3 and Cr 3 O 4 , and chromium carbide includes Cr 3 C 2 , Cr 7 C 3 , and Cr 23 C 6 .
[0014]
(2) Preparation method of thermal spray coating 1) As the thermal spray powder Fe powder to be used, C is 0.40 to 1.00 wt%, Si is 0.15 to 0.35 wt%, and Mn is 0.00. Si or Mn was added to impart temper softening resistance to a composition of 30 to 0.90 wt%, P of 0.030 wt% or less, and S of 0.035 wt% or less, or Fe-C system. For example, with respect to Fe, C: 0.40 to 1.00 wt%, Si: 1.20 to 1.60 wt%, Mn: 0.50 to 0.80 wt%, P: 0.025 wt% or less, S: 0.025 wt% or less, Cr: 0.50 to 0.80 wt%, or alloy elements added to improve high-temperature strength and wear resistance, for example, Fe with respect to C : 1.15 to 1.25 wt%, Si: 0.45 wt% or less, Mn: 0.40 wt% or less, P:. 30 wt% or less, S: 0.030 wt% or less, Cr: 3.80 to 4.50 wt%, Mo: 4.70 to 5.20 wt%, W: 5.90 to 6.70 wt%, V: 2.70 The composition should be ˜3.20 wt%. The Fe powder having such a composition is processed by a water atomizing method or a gas atomizing method to produce a powder used for thermal spraying. The particle diameter is 30 to 70 μm. The Mo powder is prepared by granulating and sintering a powder of 1 to 10 μm made of Mo and inevitable impurity elements (inevitable impurity elements are C, O, Si, Fe, etc.). The particle diameter is 50-100 μm. The graphite powder, which is a powder that forms a soft phase, is a powder obtained by coating graphite with Mo or Ni to a thickness of 1 to 10 μm. The particle diameter is 30 to 90 μm. The chromium oxide powder (or chromium carbide powder), which is a powder forming a hard phase, is prepared as a granulated sintered powder of 1 to 10 μm chromium oxide powder (or chromium carbide powder) and 1 to 10 μm Mo powder. The particle diameter is 10 to 70 μm.
[0015]
2) As a pretreatment for the pretreatment spraying, the surface of the base material on which the film is to be formed is blasted using an Al 2 O 3 abrasive, and the surface roughness after the roughening is calculated as an arithmetic average roughness Ra. Processing to become 0 μm or more is performed.
[0016]
3) Thermal spray powder supply method An Fe-Mo coating having a multiphase mixed structure is produced by an atmospheric plasma spraying method. Fe-based powder and Mo powder and soft phase composition powder (graphite powder) or hard phase composition powder (chromium oxide powder or chromium carbide powder) are prepared to have a target composition, and by the following powder supply method, The composition of the thermal spray coating is managed by supplying powder to the plasma gun from the powder supply port.
a) Fe-Mo-based thermal sprayed coating in which soft phase is dispersed a) Fe-based powder, Mo powder and graphite powder are supplied from separate supply ports.
B) A mixture of Fe-based powder and Mo powder and graphite powder are supplied from separate supply ports.
C) A mixture of Fe-based powder and graphite powder and Mo powder are supplied from separate supply ports.
D) A mixture of Mo powder and graphite powder and an Fe-based powder are supplied from separate supply ports.
E) A mixture of Fe-based powder, Mo powder and graphite powder is supplied from one supply port.
The powder is supplied by any of the methods to prepare a film.
[0017]
b) Fe-Mo system sprayed coating in which hard phase is dispersed a) Fe system powder, Mo powder and chromium oxide powder (or chromium carbide powder) are supplied from separate supply ports.
B) Supplying a mixture of Fe-based powder and Mo powder and chromium oxide powder (or chromium carbide powder) from separate supply ports.
C) A mixture of Fe-based powder and chromium oxide powder (or chromium carbide powder) and Mo powder are supplied from separate supply ports.
D) A mixture of Mo powder and chromium oxide powder (or chromium carbide powder) and an Fe-based powder are supplied from separate supply ports.
E) A mixture of Fe-based powder, Mo powder, and chromium oxide powder (or chromium carbide powder) is supplied from one supply port.
The powder is supplied by any of the methods to prepare a film.
[0018]
(3) Structure of the film a) Structure of the Fe-Mo-based sprayed coating in which the soft phase is dispersed The film is a mixed structure of the Fe-based part, Mo part and soft-phase part, and the structure of the sliding surface (surface The structure state is set to a composition range of volume ratios of Fe-based portion: 30 to 80%, Mo: 10 to 60%, and soft phase: 5 to 30%. The size (length) of one Mo viewed planarly as a surface structure is 10 to 100 μm, and the size (length) of one soft phase is 30 to 100 μm. The balance is the Fe-based part. Moreover, the porosity of a mixed structure | tissue film | membrane shall be 1-10% by a volume ratio. The average hardness is 200 to 500 HV, and the hardness of each texture phase is 400 to 800 HV for the Fe-based portion and 300 to 500 HV for the Mo portion. The film thickness of the thermal spray coating is 100 to 300 μm.
[0019]
b) Structure of Fe-Mo thermal spray coating in which hard phase is dispersed Fe-part, Mo part, hard phase part mixed-structure film, and sliding structure (surface structure) is Fe-based Part: 30 to 80%, Mo: 10 to 60%, hard phase: 10 to 30% of volume composition range. The size (length) of one Mo viewed in plan as a surface structure is 10 to 100 μm, and the size (length) of one hard phase is 10 to 50 μm. The balance is the Fe-based part. Moreover, the porosity of a mixed structure | tissue film | membrane shall be 1-10% by a volume ratio. The average hardness is 300 to 600 HV, and the hardness of each texture phase is 400 to 800 HV for the Fe-based portion, 300 to 500 HV for the Mo portion, and 500 to 900 HV for the hard phase portion. . The film thickness of the thermal spray coating is 100 to 300 μm.
[0020]
(4) Finishing method of the film Both the Fe-Mo type thermal sprayed film in which the soft phase is dispersed and the Fe-Mo type thermal sprayed film in which the hard phase is dispersed are subjected to processing (for example, honing) as a film thickness after thermal spraying. Is 50 to 200 μm, and the surface roughness is finished with an arithmetic average roughness Ra of 0.1 to 0.6 μm.
(5) The thermal spray coating of the present invention can be used in various sliding portions. In particular, it is effective to apply to the inner surface of the cylinder bore of the engine.
[0021]
【Example】
(1) Example of Fe-Mo-based thermal sprayed coating in which soft phase is dispersed (Example 1)
1) The thermal spray coating of the composition, particle size, and manufacturing method shown in Table 1 below was used as the thermal spray coating preparation method and the coating structure sprayed powder. As a pretreatment for thermal spraying, an Al 2 O 3 abrasive was used to perform a blast treatment on the surface of the base material on which the film was formed so that the surface roughness Ra was 3.0 μm or more. Using an atmospheric plasma spraying method, thermal spraying was performed under the conditions shown in Table 2 to produce a film having a thickness of 200 μm. Thereafter, the sprayed coating was polished, the film thickness was 100 μm, and the surface roughness of the coating was Ra 0.07 to 0.2 μm. The surface texture structure of the thermal spray coating is the texture structure shown in FIG. 1 (this photo is finished so that the surface roughness is Ra 0.05 μm or less in order to make the surface texture structure well understood) The volume ratio of the film is Fe-based part: 60%, Mo structure part: 30%, and graphite part: 10%. In addition, the surface structure of the thermal spray coating is obtained by observing the coating surface from the position shown in FIG. 2 in the schematic diagram of the cross-sectional structure shown in FIG. 10 is a base material, 12 is a thermal spray coating.
[0022]
[Table 1]
[Table 2]
2) Evaluation method of film Using a reciprocating wear tester, seizure resistance and wear resistance were evaluated under the test conditions shown in Table 3. FIG. 4 is a conceptual diagram of a method for performing a seizure resistance test, and FIG. 5 is a conceptual diagram of a method for performing an abrasion resistance test. The seizure resistance was evaluated by a load increase test under a lubrication condition simulating an oil film breakage state. On the other hand, the wear resistance was evaluated by a constant load test under lubricating conditions in which lubricating oil was dropped. For the pin test piece of the mating material, two types of surfaces having Cr plating and CrN coating are used. The film thickness of the Cr plating is 100 μm and the hardness is 1000 HV. The CrN film is produced by an arc ion plating method, and has a film thickness of 40 μm and a hardness of 1500 HV.
A combination of cast iron and Cr plating (mating material) was used as a comparative material for the coating of this example. The combination of cast iron and Cr plating simulates the sliding of the cylinder liner and piston ring with the current material. The composition of cast iron is Fe-3.25C-2.22Si-0.74Mn-0.15P-0.022S-0.14Cr-0.24Cu. The base is a fine pearlite structure with flake graphite and carbide uniformly dispersed.
[0025]
[Table 3]
3) Evaluation results of the film FIG. 6 shows the result of the seizure test under the test conditions shown in Table 3, and FIG. 7 shows the result of the wear test. The combination of the Fe—Mo-based thermal spray coating in which the soft phase (graphite) is dispersed and the CrN coating (counter material) of this example is 8 times more than the combination of the cast iron of the comparative material and the Cr plating (counter material). The attached load is shown. In addition, the wear amount in the wear test in the combination of the Fe—Mo-based thermal sprayed coating in which the soft phase (graphite) is dispersed and the CrN coating (counter material) of this example is as follows. ) And the wear amount in the combination test was 1/6 or less.
[0027]
(2) Example of Fe-Mo type thermal spray coating in which hard phase is dispersed (Example 2)
1) The thermal spraying powder having the composition, particle size, and manufacturing method shown in Table 4 below was used as the thermal spraying coating method and coating structure sprayed powder. As a pretreatment for thermal spraying, an Al 2 O 3 abrasive was used to perform a blast treatment on the surface of the base material on which the film was formed so that the surface roughness Ra was 3.0 μm or more. Using an atmospheric plasma spraying method, thermal spraying was performed under the conditions shown in Table 5 to produce a coating having a thickness of 200 μm. Thereafter, the sprayed coating was polished, the film thickness was 100 μm, and the surface roughness of the coating was Ra 0.07 to 0.2 μm. The surface texture structure of the thermal spray coating is the texture structure shown in FIG. 3 (this photo is finished so that the surface roughness is 0.05 μm or less in order to make the surface texture structure well understood) The volume ratio of the film is Fe-based part: 60%, Mo structure part: 10%, and chromium oxide part: 30%.
[0028]
[Table 4]
[Table 5]
2) Evaluation method of film The seizure resistance and the abrasion resistance were evaluated under the test conditions shown in Table 3 above. The comparison material is the same.
3) Evaluation results of the film FIG. 6 shows the result of the seizure test under the test conditions shown in Table 3, and FIG. 7 shows the result of the wear test. The combination of the Fe—Mo-based thermal spray coating in which the hard phase (chromium oxide) is dispersed and the CrN coating (counter material) of this example is more than five times the combination of the cast iron of the comparative material and the Cr plating (counter material). The seizure load was shown. Further, the wear amount in the wear test in the combination of the Fe—Mo-based thermal spray coating in which the hard phase (chromium oxide) is dispersed in this example and the CrN coating (the counterpart material) is such that the wear amount cannot be measured. Trace amount.
[0031]
【The invention's effect】
Since this invention is comprised as mentioned above, there exist the following effects.
(1) By forming a thermal spray coating having a multiphase mixed structure in which a soft phase (graphite) or a hard phase (chromium oxide, chromium carbide) is dispersed in a thermal spray coating mainly composed of Fe and Mo, the sliding portion It is possible to improve composite properties such as wear resistance, seizure resistance, and initial conformability.
(2) The thermal spray coating of the present invention can be used in various sliding portions. In particular, it is effective to apply to the inner surface of the cylinder bore of the engine.
[Brief description of the drawings]
1 is a photograph taken with a scanning electron microscope showing the surface structure of an abrasion-resistant sprayed coating (Fe—Mo based sprayed coating in which a soft phase (graphite) is dispersed) in Example 1 of the present invention (magnification 100). Times).
FIG. 2 is a schematic diagram showing an example of a cross-sectional structure of an abrasion-resistant sprayed coating, and shows an observation position of a surface structure of the sprayed coating.
FIG. 3 is a photograph taken with a scanning electron microscope showing the surface structure of an abrasion-resistant sprayed coating (Fe—Mo-based sprayed coating in which a hard phase (chromium oxide) is dispersed) in Example 2 of the present invention (magnification) 100 times).
FIG. 4 is a conceptual diagram illustrating a test method for evaluating seizure resistance used in examples of the present invention.
FIG. 5 is a conceptual diagram illustrating a test method for evaluating wear resistance used in an example of the present invention.
FIG. 6 is a graph showing a seizure resistance test result in an example of the present invention.
FIG. 7 is a graph showing the test results of wear resistance in the examples of the present invention.
[Explanation of symbols]
10 Substrate 12 Thermal spray coating
Claims (14)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003022860A JP4281368B2 (en) | 2003-01-30 | 2003-01-30 | Abrasion resistant spray coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003022860A JP4281368B2 (en) | 2003-01-30 | 2003-01-30 | Abrasion resistant spray coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004232035A JP2004232035A (en) | 2004-08-19 |
| JP4281368B2 true JP4281368B2 (en) | 2009-06-17 |
Family
ID=32951821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003022860A Expired - Lifetime JP4281368B2 (en) | 2003-01-30 | 2003-01-30 | Abrasion resistant spray coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4281368B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007177760A (en) * | 2005-12-28 | 2007-07-12 | Nissan Motor Co Ltd | Piston, piston ring and cylinder block for internal combustion engine |
| JP5229862B2 (en) * | 2007-08-29 | 2013-07-03 | 独立行政法人産業技術総合研究所 | Fe7Mo6 base alloy composed of three phases and manufacturing method thereof |
| JP5146402B2 (en) | 2009-05-19 | 2013-02-20 | トヨタ自動車株式会社 | Method for forming carbon particle-containing coating, heat transfer member, power module, and vehicle inverter |
| JP5826958B1 (en) * | 2014-07-29 | 2015-12-02 | 株式会社リケン | Piston ring for internal combustion engine |
| KR20160053121A (en) | 2014-10-31 | 2016-05-13 | 현대자동차주식회사 | Coating method for shift fork and shift fork with amorphous coating layer by using the same |
| JP7435803B2 (en) * | 2020-09-02 | 2024-02-21 | 日産自動車株式会社 | Thermal spray coating and method for producing the spray coating |
-
2003
- 2003-01-30 JP JP2003022860A patent/JP4281368B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004232035A (en) | 2004-08-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Yan et al. | Microstructure and wear resistance of plasma-sprayed molybdenum coating reinforced by MoSi2 particles | |
| JP5903085B2 (en) | Combination of cylinder bore and piston ring | |
| US9194492B2 (en) | Piston ring having a thermally sprayed coating and method for producing same | |
| US20110254230A1 (en) | Coatings and powders, methods of making same, and uses thereof | |
| JP4790135B2 (en) | Wear-resistant sliding member | |
| JPWO2004035852A1 (en) | Piston ring, thermal spray coating used therefor, and manufacturing method | |
| JP2003064463A (en) | Wear-resistant sprayed coating film on sliding member | |
| JP2003013163A (en) | Powder aluminum alloy sliding member and combination of cylinder and piston ring | |
| JP5514187B2 (en) | piston ring | |
| JP4281368B2 (en) | Abrasion resistant spray coating | |
| RU2635119C2 (en) | Wear-resistant coating for piston rings | |
| JP5257756B2 (en) | Iron-based thermal spray coating, method for forming the same, and sliding member | |
| JP4247882B2 (en) | Abrasion resistant spray coating | |
| JP2005155711A (en) | Thermal spray piston ring and manufacturing method thereof | |
| KR101915593B1 (en) | Piston ring and manufacturing method thereof | |
| JPH08246944A (en) | Cylinder for internal combustion engine and manufacture thereof | |
| JP2004183075A (en) | Wear resistant member, and rolling member using it | |
| JP2019100350A (en) | Sliding member | |
| JP2004307975A (en) | Sliding member | |
| DK201870188A1 (en) | Piston ring and manufacturing method therefor | |
| JPS5993865A (en) | Sliding member | |
| JPH10183327A (en) | Thermally sprayed film layer having fitness to sliding member | |
| WO2023113035A1 (en) | Thermal spray coating film, sliding member and piston ring | |
| JP3248938B2 (en) | Sliding member | |
| JPH09152035A (en) | Piston ring |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20050927 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20060201 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20060620 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20060811 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20061031 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20061214 |
|
| A911 | Transfer to examiner for re-examination before appeal (zenchi) |
Free format text: JAPANESE INTERMEDIATE CODE: A911 Effective date: 20070329 |
|
| A912 | Re-examination (zenchi) completed and case transferred to appeal board |
Free format text: JAPANESE INTERMEDIATE CODE: A912 Effective date: 20070420 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20090309 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 4281368 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120327 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120327 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130327 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130327 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140327 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20150327 Year of fee payment: 6 |
|
| EXPY | Cancellation because of completion of term |