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JPH0633185A - Production of sintered alloy for valve seat excellent in wear resistance - Google Patents

Production of sintered alloy for valve seat excellent in wear resistance

Info

Publication number
JPH0633185A
JPH0633185A JP19424792A JP19424792A JPH0633185A JP H0633185 A JPH0633185 A JP H0633185A JP 19424792 A JP19424792 A JP 19424792A JP 19424792 A JP19424792 A JP 19424792A JP H0633185 A JPH0633185 A JP H0633185A
Authority
JP
Japan
Prior art keywords
powder
iron
wear resistance
alloy
sintered
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.)
Pending
Application number
JP19424792A
Other languages
Japanese (ja)
Inventor
Tadataka Kaneko
忠孝 金子
Hiroshi Okajima
博司 岡島
Yoshitaka Takahashi
義孝 高橋
Takashi Maejima
隆 前島
Hideki Kato
秀樹 加藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NIPPON FUNMATSU GOKIN KK
Toyota Motor Corp
Original Assignee
NIPPON FUNMATSU GOKIN KK
Toyota Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NIPPON FUNMATSU GOKIN KK, Toyota Motor Corp filed Critical NIPPON FUNMATSU GOKIN KK
Priority to JP19424792A priority Critical patent/JPH0633185A/en
Publication of JPH0633185A publication Critical patent/JPH0633185A/en
Pending legal-status Critical Current

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  • Powder Metallurgy (AREA)

Abstract

PURPOSE:To produce an iron-base sintered alloy for valve seat excellent in heat, corrosion and wear resistances by mixing powders of carbon, Co, FeMo, etc., with a powder of iron-base alloy of specific composition at specific ratio, applying compacting and sintering to the resulting powder mixture, and then subjecting the resulting sintered compact to subzero treatment and to tempering treatment. CONSTITUTION:As a ferrous matrix structure constituting a matrix, a powder of an iron-base alloy having a composition consisting of, by weight, 1.0-5.0% Cr, <=0.2% O, 0.1% C, and the balance Fe with inevitable impurities is used. A powder mixture is prepared by mixing 0.3-2.0% carbon powder, 3.0-30% of one or more kinds among the powders of Co, Ni, and Fe, and 2.0-20% of one or more kinds among the powders of FeMo, FeW, and FeCr are mixed with the iron-base alloy powder. This powder mixture is compacted and sintered. Then the resulting sintered compact is subjected to subzero treatment, by which a martensite or sorbite structure is formed. Further, the strain resulting from this treatment is removed by tempering treatment.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は自動車内燃機関のバルブ
シート用焼結合金の製造方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a sintered alloy for a valve seat of an automobile internal combustion engine.

【0002】[0002]

【従来の技術】バルブシートは、内燃機関のシリンダー
ヘッドに組み込まれている部材であり、きのこ形のバル
ブのバルブフェースが着座することにより、混合ガスや
燃焼ガスをシールするものである。バルブは燃焼ガス中
で高速で上下運動してバルブシートに着座と離脱を繰り
返すので、バルブシートは耐熱性、耐食性および耐摩耗
性と併せて、相手材であるバルブを摩耗させない相手攻
撃性が要求される。
2. Description of the Related Art A valve seat is a member incorporated in a cylinder head of an internal combustion engine, and seals mixed gas and combustion gas by seating a valve face of a mushroom-shaped valve. Since the valve moves up and down at high speed in combustion gas and repeatedly sits on and leaves the valve seat, the valve seat requires heat resistance, corrosion resistance, and wear resistance, as well as aggression against the material that does not wear the mating valve. To be done.

【0003】従来のバルブシート材料としては、Fe−
C−Co−Ni基材料、Fe−C基材料に耐摩耗性の向
上を狙ってフェロモリブデン(Fe−Mo)、フェロク
ロム(Fe−Cr)等の金属間化合物またはFe−C−
Cr−Mo−V合金等を添加したものが使用されている
(特開昭56−154110号公報)。
As a conventional valve seat material, Fe-
C-Co-Ni-based materials and Fe-C-based materials aiming at improvement of wear resistance, intermetallic compounds such as ferromolybdenum (Fe-Mo) and ferrochrome (Fe-Cr), or Fe-C-
The one to which a Cr-Mo-V alloy or the like is added is used (Japanese Patent Laid-Open No. 56-154110).

【0004】さらに、CrおよびMoを含有するFe−
C基地組織中に、Cr、Mo、V等からなる鉄系硬質粒
子を分散させ耐摩耗性と相手攻撃性を改善した焼結合金
(特開昭60−224762号公報)、Pb合金等を含
浸させたFe−C−Co−Ni系基地組織中にFe−C
−Cr−Mo−V合金からなる硬質粒子を分散させた焼
結合金(特開昭60−251258号公報)が開示され
ている。
Further, Fe-containing Cr and Mo
Impregnated with a sintered alloy (Japanese Patent Laid-Open No. 60-224762), Pb alloy, etc., in which iron-based hard particles composed of Cr, Mo, V, etc. are dispersed in the C base structure to improve wear resistance and opponent attack. Fe-C in the formed Fe-C-Co-Ni matrix structure
A sintered alloy in which hard particles made of a -Cr-Mo-V alloy are dispersed (Japanese Patent Laid-Open No. 60-251258) is disclosed.

【0005】また、特開昭60−258449号公報に
は、オーステナイト組織、パーライト組織、フェライト
組織の混合組織からなるFe−C−Co−Ni系基地組
織中に、Fe−Mo合金層からなる硬質粒子を均一に分
散し、該硬質粒子を基地組織中に拡散させて強固に結合
したバルブシート用鉄系焼結合金が開示されている。
Further, in Japanese Patent Laid-Open No. 60-258449, a Fe-C-Co-Ni based matrix structure having a mixed structure of an austenite structure, a pearlite structure and a ferrite structure is provided with a hard layer composed of an Fe-Mo alloy layer. An iron-based sintered alloy for a valve seat is disclosed in which particles are uniformly dispersed and the hard particles are diffused in a matrix structure and firmly bonded.

【0006】[0006]

【発明が解決しようとする課題】然るに、最近は自動車
エンジンにおいて、長寿命化、高出力、高回転化、排出
ガス浄化対策、あるいは燃費向上対策に対する改善要求
が一段と高まっている。このため、自動車エンジンにお
けるエンジンバルブ、バルブシートに対しては、従来に
も増して厳しい使用環境に耐えることが不可避となって
きており、耐熱性、耐摩耗性をより一層向上させると共
に、高温での耐食性を向上させる必要が生じてきてい
る。
However, recently, in automobile engines, there has been an increasing demand for improvement in long life, high output, high rotation, exhaust gas purification measures, or fuel consumption improvement measures. For this reason, it has become more unavoidable than ever to withstand harsh operating environments for engine valves and valve seats in automobile engines, further improving heat resistance and wear resistance, and at high temperatures. There is a growing need to improve the corrosion resistance of aluminum.

【0007】本発明は、最近の自動車エンジンの高出力
化、燃費の向上等に伴う従来のバルブシート用焼結合金
の高性能化の要請に対応すべく発明されたものであっ
て、耐熱性および耐摩耗性をより一層向上させることの
できるバルブシート用鉄系焼結合金の製造方法を提供す
ることを目的とする。
The present invention has been invented to meet the demand for higher performance of conventional sintered alloys for valve seats, which accompanies the recent increase in output of automobile engines and improvement in fuel consumption. Another object of the present invention is to provide a method for producing an iron-based sintered alloy for a valve seat, which can further improve wear resistance.

【0008】[0008]

【課題を解決するための手段】そこで、発明者等は高温
での耐腐食性および耐摩耗性を向上するために、バルブ
シート用鉄系焼結合金材の基地組織の化学成分、組織等
について、鋭意研究を重ねた。その結果、優れた耐熱性
および耐摩耗性を発揮するためには、基地組織が均一で
あることが必要であることを新たに知見した。そこで、
基地組織を鉄基合金粉末をベースとすることにより優れ
た耐熱性および耐摩耗性の得られることを見出した。
In order to improve the corrosion resistance and wear resistance at high temperatures, the inventors of the present invention have studied the chemical composition, structure, etc. of the matrix structure of the iron-based sintered alloy material for valve seats. , Repeated intensive research. As a result, it was newly found that the matrix structure must be uniform in order to exhibit excellent heat resistance and wear resistance. Therefore,
It was found that excellent heat resistance and wear resistance can be obtained by using an iron-based alloy powder as the base structure.

【0009】また、基地となる鉄基合金の組織について
も研究を重ねたところ、サブゼロ処理によりマルテンサ
イト組織またはソルバイト組織にすることにより優れた
耐摩耗性が得られることを知見した。さらにCo、Ni
またはFeを添加することにより基地組織を固溶強化
し、FeMo、FeW、FeCr等の硬質粒子を分散さ
せることにより耐摩耗性を向させて本発明を完成した。
Further, as a result of repeated research on the structure of the iron-based alloy serving as a base, it was found that excellent wear resistance can be obtained by forming a martensite structure or a sorbite structure by subzero treatment. Furthermore, Co, Ni
Alternatively, Fe was added to strengthen the matrix structure in a solid solution, and hard particles such as FeMo, FeW, and FeCr are dispersed to improve wear resistance, thereby completing the present invention.

【0010】本発明の耐摩耗性に優れたバルブシート用
鉄基焼結合金の製造方法は、重量比で、Cr;1.0〜
5.0%、O;0.2%以下、C;0.1%以下を含有
し残部がFeおよび不可避不純物からなる鉄基合金粉末
に、炭素粉末0.3〜2.0%と、Co粉末、Ni粉
末、Fe粉末のうち1種または2種以上3.0〜30%
と、FeMo、FeW、FeCr粉末のうち1種または
2種以上2.0〜20%を混合し、該混合粉を圧縮成形
後、焼結し、該焼結体にサブゼロ処理と焼戻し処理を施
すことを要旨とする。
The method for producing an iron-based sintered alloy for valve seats having excellent wear resistance according to the present invention is, by weight ratio, Cr: 1.0 to
Iron-based alloy powder containing 5.0%, O; 0.2% or less, C; 0.1% or less, the balance being Fe and inevitable impurities, carbon powder 0.3 to 2.0%, Co Powder, Ni powder, Fe powder 1 type or 2 types or more 3.0 to 30%
And one or more of FeMo, FeW, and FeCr powders, 2.0 to 20% are mixed, the mixed powder is compression-molded, and then sintered, and the sintered body is subjected to subzero treatment and tempering treatment. That is the summary.

【0011】[0011]

【作用】マトリックスを構成するFe系基地組織にCr
を含有する鉄基合金粉末を用いたので、組織が均一化し
耐熱性および耐食性を向上させることができた。また、
合金粉末のO含有量を規制することにより、Cr添加の
効果を確保すると共に、Fe系基地組織はサブゼロ処理
によりマルテンサイト組織またはソルバイト組織とした
ので、さらに耐熱性および耐食性が向上した。
[Function] Cr is added to the Fe-based matrix structure that constitutes the matrix.
Since the iron-based alloy powder containing is used, the structure is made uniform and heat resistance and corrosion resistance can be improved. Also,
By regulating the O content of the alloy powder, the effect of Cr addition was secured, and the Fe-based matrix structure was made into a martensite structure or sorbite structure by subzero treatment, so that the heat resistance and corrosion resistance were further improved.

【0012】マトリックスを構成するFe系基地組織
に、Co、NiまたはFeを3〜30%固溶させたの
で、強度が向上すると共に優れた耐熱性および耐腐食性
が得られた。また、FeMo、FeW、FeCr粉末の
うち1種または2種以上2.0〜20%を混合したの
で、耐摩耗性を向上させることができた。
3% to 30% of Co, Ni or Fe was solid-dissolved in the Fe-based matrix structure constituting the matrix, so that the strength was improved and excellent heat resistance and corrosion resistance were obtained. Further, since one or more of FeMo, FeW, and FeCr powders were mixed at 2.0 to 20%, wear resistance could be improved.

【0013】次に、本発明において焼結合金を構成する
成分の組成範囲等を限定した理由について説明する。先
ず、基地組織を構成する鉄基合金粉末の組成範囲の限定
理由について述べる。 Cr;1.0〜5.0% Crは基地組織の耐熱性および耐食性を向上させるため
に含有させる。Cr含有量が1.0%未満では前記効果
が得られず、5.0%を越えると前記効果の大幅な向上
が見られないだけでなく、粉末としての圧縮性低下によ
り成形体の密度も低下するので、その含有量を1.0〜
5.0%に限定した。
Next, the reason for limiting the composition range of the components constituting the sintered alloy in the present invention will be described. First, the reasons for limiting the composition range of the iron-based alloy powder forming the matrix structure will be described. Cr: 1.0 to 5.0% Cr is contained in order to improve the heat resistance and corrosion resistance of the matrix structure. If the Cr content is less than 1.0%, the above effect cannot be obtained, and if it exceeds 5.0%, the above effect is not significantly improved, and the compactness of the powder is lowered, so that the density of the compact is also reduced. Therefore, the content is 1.0 to
Limited to 5.0%.

【0014】O;0.2%以下 Oは0.2%を越えて含有されると圧縮性の低下を来す
ばかりでなく、Crと結びつき、Crの効果を妨げるの
で、その上限を0.2%とした。 C;0.1%以下 Cは0.1%を越えて含有されると圧縮性の低下が起こ
るので、その含有量の上限を0.1%とした。
O: 0.2% or less If O exceeds 0.2%, not only does the compressibility deteriorate, but it also binds to Cr and hinders the effect of Cr. It was set to 2%. C: 0.1% or less C is contained in an amount exceeding 0.1%, so that the compressibility decreases, so the upper limit of the content is made 0.1%.

【0015】次に、基地組織となる鉄基合金粉末に添加
した合金粉末、硬質粒子粉末等の組成範囲限定理由につ
いて説明する。 炭素粉末;0.3〜2% Cは素地に固溶してこれを強化すると共に、Cr成分と
炭化物を形成して耐摩耗性を向上させる効果があるが、
0.3%未満の添加では前記の効果が得られず、2%を
越えて含有させると粗大なセメンタイトが析出して脆化
が著しくなるので、その含有量は0.3〜2%に限定し
た。
Next, the reason for limiting the composition range of the alloy powder, hard particle powder, etc. added to the iron-based alloy powder forming the matrix structure will be explained. Carbon powder: 0.3 to 2% C has the effect of forming a solid solution in the matrix to strengthen it and form carbides with the Cr component to improve wear resistance.
If the content is less than 0.3%, the above effect cannot be obtained, and if the content exceeds 2%, coarse cementite precipitates and embrittlement becomes remarkable, so the content is limited to 0.3 to 2%. did.

【0016】Co粉末、Ni粉末、Fe粉末のうち1種
または2種以上;3.0〜30% これら成分は素地に固溶してこれを強化するとともに、
耐熱性を向上させる効果があるが、3.0%未満では前
記効果が得られず、30%を越えて含有させても、前記
効果のさらなる向上は見られないため、その含有量を
3.0〜30%に限定した。なお、Fe粉末としてはカ
ーボニール鉄を用いると、焼結の促進に寄与し、密度向
上の効果が得られる。
One or more of Co powder, Ni powder and Fe powder; 3.0 to 30% These components form a solid solution in the matrix to strengthen it, and
Although it has an effect of improving heat resistance, if it is less than 3.0%, the above effect cannot be obtained, and if it exceeds 30%, the effect is not further improved. Limited to 0-30%. When carbonyl iron is used as the Fe powder, it contributes to the promotion of sintering and the effect of improving the density is obtained.

【0017】FeMo、FeW、FeCr粉末のうち1
種または2種以上;2.0〜20% Moを60〜70%含有するFe−Mo(Hv600〜
1300)、およびWを75〜85%含有するFe−W
(Hv500〜1000)、Crを60〜70%含有す
るFe−Cr(Hv1100〜1800)は、硬さが高
いためこれらを均一に分散させた場合、硬質粒子として
作用して耐摩耗性を向上させる効果があるが、2%未満
ではその効果が少なく、また20%を越えると、相手バ
ルブ材への攻撃性が大きく相手材を摩耗させることにな
り、加えて被削性の低下を招くため、その分散量を2.
0〜20%とした。
One of FeMo, FeW and FeCr powders
Fe-Mo (Hv600-) containing 60 to 70% of 2.0 to 20% Mo
1300), and Fe-W containing 75 to 85% W.
(Hv500 to 1000) and Fe-Cr (Hv1100 to 1800) containing 60 to 70% of Cr have high hardness, and when they are uniformly dispersed, they act as hard particles to improve wear resistance. Although it is effective, if it is less than 2%, the effect is small, and if it exceeds 20%, the other valve material is greatly attacked and the other material is worn, and in addition, the machinability is deteriorated. The amount of dispersion is 2.
It was set to 0 to 20%.

【0018】サブゼロ処理は、オーステナイトが多く存
在した不安定な組織の安定化のため、マルテンサイト変
態を十分に進行させるために実施する。また、焼戻し処
理は、サブゼロ処理において生じたマルテンサイト変態
の歪み取りのために必要である。
The sub-zero treatment is carried out in order to sufficiently advance the martensitic transformation in order to stabilize the unstable structure in which a large amount of austenite was present. Further, the tempering treatment is necessary for removing the strain of the martensitic transformation generated in the subzero treatment.

【0019】[0019]

【実施例】本発明の実施例を比較例と対比しつつ説明
し、本発明の効果を明らかにする。原料粉末として、C
r系合金粉末(O;0.2以下、C;0.1以下)、還
元鉄粉、FeCr粉といずれも75μm以下のCo粉
末、Ni粉末、金属間化合物FeMo粉末、金属間化合
物FeW粉末に、さらに粒度25μm以下の天然黒鉛粉
末および潤滑剤ステアリン酸亜鉛粉末を用意し、これら
原料粉末を表1および表2に示した組成になるように配
合し、潤滑剤0.8%を添加した後、混粉装置により混
合を行った。
EXAMPLES Examples of the present invention will be described in comparison with comparative examples to clarify the effects of the present invention. As raw material powder, C
r-based alloy powder (O; 0.2 or less, C; 0.1 or less), reduced iron powder, FeCr powder, Co powder of 75 μm or less, Ni powder, intermetallic compound FeMo powder, intermetallic compound FeW powder After further preparing natural graphite powder having a particle size of 25 μm or less and lubricant zinc stearate powder, blending these raw material powders so as to have the compositions shown in Tables 1 and 2, and adding 0.8% of lubricant. The powder was mixed with a powder mixing device.

【0020】表1は本発明の実施例であり、表2は比較
例であって、比較例1はCr系合金粉末を用いなかった
もの、比較例2はCo粉末、Ni粉末、Fe粉末の添加
量が2%以下であるもの、比較例3はCo粉末、Ni粉
末、Fe粉末の添加量が20%以上であるもの、比較例
4はFeMo、FeW、FeCr等の硬質粒子の分散量
が2%以下であるもの、比較例5はFeMo、FeW、
FeCr等の硬質粒子の分散量が20%以上であるも
の、比較例6は黒鉛粉末の添加量が0.3%未満である
もの、比較例7は黒鉛粉末の添加量が2.0%を越えた
もの、比較例8はサブゼロ処理を省略したものである。
Table 1 is an example of the present invention, Table 2 is a comparative example, Comparative Example 1 does not use Cr alloy powder, Comparative Example 2 shows Co powder, Ni powder and Fe powder. The additive amount is 2% or less, the comparative example 3 is 20% or more of the Co powder, the Ni powder and the Fe powder, and the comparative example 4 is the dispersion amount of hard particles such as FeMo, FeW and FeCr. 2% or less, Comparative Example 5 is FeMo, FeW,
The amount of hard particles such as FeCr dispersed is 20% or more, the amount of graphite powder added is less than 0.3% in Comparative Example 6, and the amount of graphite powder added is 2.0% in Comparative Example 7. In the case of exceeding, the comparative example 8 omits the sub-zero treatment.

【0021】[0021]

【表1】 [Table 1]

【0022】[0022]

【表2】 [Table 2]

【0023】この混合粉で700MPaの成形圧力によ
り、各種試験片圧粉体を成形した。成形した圧粉体を還
元性雰囲気で1453Kの温度で900秒保持し、焼結
を行った。焼結した各種試験片圧粉体を213Kで18
00秒保持し、サブゼロ処理を行い、その後、773K
で6000秒保持し、焼戻し処理を行った。ただし、実
施例については、焼結後に1000MPaで再圧縮を行
い、比較例8については、サブゼロ処理を省略した。
Various powder compacts of test pieces were molded from the mixed powder under a molding pressure of 700 MPa. The compacted green compact was held in a reducing atmosphere at a temperature of 1453K for 900 seconds for sintering. Sintered various test piece compacts were made at 213K for 18
Hold for 00 seconds, perform sub-zero processing, then 773K
And held for 6000 seconds for tempering. However, in Example, re-compression was performed at 1000 MPa after sintering, and in Comparative Example 8, the sub-zero treatment was omitted.

【0024】得られた試験片について、基地組織のマル
テンサイトおよびベイナイトの割合、硬さおよび大越式
摩耗試験による摩耗量を測定した。測定結果は表3に示
した。なお、測定はJPMA(日本粉末冶金工業会規
格)に準じて行った。また、大越摩耗試験条件を以下に
示す。 相手材 S45C すべり速度 0.250mm/sec 摩擦距離 200m 最終荷重 32N
With respect to the obtained test piece, the proportion of martensite and bainite in the matrix structure, hardness, and the amount of wear by the Ogoshi-type wear test were measured. The measurement results are shown in Table 3. The measurement was performed according to JPMA (Japan Powder Metallurgy Association Standard). The Ogoshi abrasion test conditions are shown below. Counterpart material S45C Sliding speed 0.250mm / sec Friction distance 200m Final load 32N

【0025】[0025]

【表3】 [Table 3]

【0026】表3に示したように、比較例1はCr系合
金粉末を用いなかったので、マルテンサイト・ベイナイ
ト割合が5%と低く、硬さがHV210であって摩耗量
が5.01mmと耐摩耗性に劣る。比較例2はCo粉
末、Ni粉末、Fe粉末の添加量が2%以下であったの
で硬度がHv435と低く強度が不十分であり、比較例
3はCo粉末、Ni粉末、Fe粉末の添加量が20%以
上であったので、マルテンサイトおよびベイナイトの割
合が52%と少なく摩耗量が3.08mmで耐摩耗性に
劣った。
As shown in Table 3, in Comparative Example 1, since no Cr alloy powder was used, the martensite / bainite ratio was as low as 5%, the hardness was HV210, and the wear amount was 5.01 mm. Inferior in wear resistance. In Comparative Example 2, the added amount of Co powder, Ni powder, and Fe powder was 2% or less, so the hardness was low at Hv435 and the strength was insufficient, and in Comparative Example 3, the added amount of Co powder, Ni powder, and Fe powder. Was 20% or more, the ratio of martensite and bainite was as small as 52%, and the wear amount was 3.08 mm, and the wear resistance was poor.

【0027】FeMo、FeW、FeCr等の硬質粒子
の分散量が2%以下である比較例4は、硬さが低く摩耗
量が3.97mmで耐摩耗性に劣り、FeMo、Fe
W、FeCr等の硬質粒子の分散量が20%以上である
比較例5は、硬度は高かったものの同様摩耗量が5.1
5mmと多かった。比較例6は黒鉛粉末の添加量が0.
3%未満であったため、マルテンサイト比率が12%と
少なくて硬度が低く耐摩耗性に劣り、比較例7は黒鉛粉
末の添加量が2.0%を越えたものであったので、硬度
は高かったものの摩耗量が4.95mmで耐摩耗性に劣
った。また、比較例8は他の比較例より摩耗量が少なか
ったが、相手材の摩耗量が他の比較例の倍以上あって、
バルブシート材料としては使用できなかった。
In Comparative Example 4 in which the dispersion amount of hard particles such as FeMo, FeW, FeCr is 2% or less, the hardness is low, the wear amount is 3.97 mm, and the wear resistance is inferior.
In Comparative Example 5 in which the dispersion amount of hard particles such as W and FeCr is 20% or more, although the hardness was high, the wear amount was 5.1.
It was as large as 5 mm. In Comparative Example 6, the amount of graphite powder added was 0.
Since it was less than 3%, the martensite ratio was as small as 12% and the hardness was low and the wear resistance was inferior. In Comparative Example 7, the addition amount of the graphite powder was more than 2.0%. Although it was high, the wear amount was 4.95 mm and the wear resistance was poor. Further, Comparative Example 8 had a smaller amount of wear than the other Comparative Examples, but the amount of wear of the mating material was more than double that of the other Comparative Examples,
It could not be used as a valve seat material.

【0028】これに対して表1の本発明の実施例1〜9
は、マルテンサイトおよびベイナイト割合が73〜88
%であって、硬さがHv460〜565であり、十分な
硬さと強度を有し、摩耗量も2.11〜2.42mmで
あって、耐摩耗性に優れていることが判明し、本発明の
効果が確認された。
On the other hand, Examples 1 to 9 of the present invention shown in Table 1
Has a martensite and bainite ratio of 73 to 88.
%, The hardness is Hv 460 to 565, sufficient hardness and strength, and the wear amount is 2.11 to 2.42 mm, which proves to be excellent in wear resistance. The effect of the invention was confirmed.

【0029】[0029]

【発明の効果】本発明の耐摩耗性に優れたバルブシート
用鉄基焼結合金の製造方法は、マトリックスを構成する
Fe系基地組織にCr;1.0〜5.0%、O;0.2
%以下、C;0.1%以下を含有し残部かFeおよび不
可避不純物からなる鉄基合金粉末を用いたので、組織が
均一化し耐熱性および耐食性を向上させることができ
た。また、合金粉末のO含有量を規制することにより、
Cr添加の効果を確保すると共に、Fe系基地組織はサ
ブゼロ処理によりマルテンサイト組織またはソルバイト
組織としたので、さらに耐熱性および耐食性が向上し
た。マトリックスを構成するFe系基地組織に、炭素粉
末0.3〜2.0%と、Co、NiまたはFeを3〜3
0%固溶させたので、強度が向上すると共に優れた耐熱
性および耐腐食性が得られた。また、FeMo、Fe
W、FeCr粉末のうち1種または2種以上2.0〜2
0%を混合したので、耐摩耗性を向上させることができ
た。
EFFECTS OF THE INVENTION The method for producing an iron-based sintered alloy for valve seats having excellent wear resistance according to the present invention comprises Cr: 1.0 to 5.0% and O; 0 in the Fe-based matrix structure constituting the matrix. .2
%, C; 0.1% or less, and the balance was used, and an iron-based alloy powder consisting of Fe and unavoidable impurities was used, so that the structure was made uniform and heat resistance and corrosion resistance could be improved. Further, by controlling the O content of the alloy powder,
Since the effect of adding Cr was secured and the Fe-based matrix structure was made into a martensite structure or a sorbite structure by subzero treatment, the heat resistance and corrosion resistance were further improved. Carbon powder 0.3 to 2.0% and Co, Ni or Fe 3 to 3 in the Fe-based matrix structure forming the matrix.
Since the solid solution was 0%, strength was improved and excellent heat resistance and corrosion resistance were obtained. In addition, FeMo, Fe
One or more of W and FeCr powders 2.0 to 2
Since 0% was mixed, wear resistance could be improved.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 C22C 38/40 (72)発明者 岡島 博司 愛知県豊田市トヨタ町1番地 トヨタ自動 車株式会社内 (72)発明者 高橋 義孝 愛知県豊田市トヨタ町1番地 トヨタ自動 車株式会社内 (72)発明者 前島 隆 京都市山科区栗栖野狐塚町5−1 日本粉 末合金株式会社内 (72)発明者 加藤 秀樹 京都市山科区栗栖野狐塚町5−1 日本粉 末合金株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical display location C22C 38/40 (72) Inventor Hiroshi Okajima 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd. (72) Inventor Yoshitaka Takahashi 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Automobile Co., Ltd. (72) Inventor Takashi Maejima 5-1 Kurisuno Kinuzukacho, Yamashina-ku, Kyoto City Nippon Powder Powder Co., Ltd. (72) Inventor Hideki Kato 5-1, Kitsusu-cho, Kurusuno, Yamashina-ku, Kyoto

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 重量比で、Cr;1.0〜5.0%、
O;0.2%以下、C;0.1%以下を含有し残部がF
eおよび不可避不純物からなる鉄基合金粉末に、炭素粉
末0.3〜2.0%と、Co粉末、Ni粉末、Fe粉末
のうち1種または2種以上3.0〜30%と、FeM
o、FeW、FeCr粉末のうち1種または2種以上
2.0〜20%を混合し、該混合粉を圧縮成形後、焼結
し、該焼結体にサブゼロ処理と焼戻し処理を施すことを
特徴とする耐摩耗性に優れたバルブシート用鉄基焼結合
金の製造方法。
1. A weight ratio of Cr: 1.0 to 5.0%,
O: 0.2% or less, C: 0.1% or less, the balance being F
Fe-based alloy powder consisting of e and unavoidable impurities, carbon powder 0.3 to 2.0%, Co powder, Ni powder, Fe powder, one or more kinds 3.0 to 30%, FeM
o, FeW, and FeCr powders, one or more of which are mixed in a proportion of 2.0 to 20%, and the mixed powder is compression-molded and then sintered, and the sintered body is subjected to subzero treatment and tempering treatment. A method for producing an iron-based sintered alloy having excellent wear resistance for valve seats.
JP19424792A 1992-07-21 1992-07-21 Production of sintered alloy for valve seat excellent in wear resistance Pending JPH0633185A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19424792A JPH0633185A (en) 1992-07-21 1992-07-21 Production of sintered alloy for valve seat excellent in wear resistance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19424792A JPH0633185A (en) 1992-07-21 1992-07-21 Production of sintered alloy for valve seat excellent in wear resistance

Publications (1)

Publication Number Publication Date
JPH0633185A true JPH0633185A (en) 1994-02-08

Family

ID=16321436

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19424792A Pending JPH0633185A (en) 1992-07-21 1992-07-21 Production of sintered alloy for valve seat excellent in wear resistance

Country Status (1)

Country Link
JP (1) JPH0633185A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6733723B2 (en) * 2002-01-22 2004-05-11 Samsung Electronics Co., Ltd. Method for producing sintered metal and a rotary compressor flange produced by use of the method
JP2007061892A (en) * 2005-09-02 2007-03-15 Yanmar Co Ltd Method for casting cast iron, and method for manufacturing cylinder head of internal combustion engine using the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6733723B2 (en) * 2002-01-22 2004-05-11 Samsung Electronics Co., Ltd. Method for producing sintered metal and a rotary compressor flange produced by use of the method
JP2007061892A (en) * 2005-09-02 2007-03-15 Yanmar Co Ltd Method for casting cast iron, and method for manufacturing cylinder head of internal combustion engine using the same
JP4646227B2 (en) * 2005-09-02 2011-03-09 ヤンマー株式会社 Method for casting cast iron and method for manufacturing cylinder head for internal combustion engine using the method

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