JP2000054088A - High strength iron-base sintered valve seat - Google Patents
High strength iron-base sintered valve seatInfo
- Publication number
- JP2000054088A JP2000054088A JP10221294A JP22129498A JP2000054088A JP 2000054088 A JP2000054088 A JP 2000054088A JP 10221294 A JP10221294 A JP 10221294A JP 22129498 A JP22129498 A JP 22129498A JP 2000054088 A JP2000054088 A JP 2000054088A
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- Prior art keywords
- weight
- valve seat
- alloy phase
- powder
- strength
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、高密度、高強度
で耐摩耗性に優れかつ相手攻撃性の少ないＦｅ基焼結バ
ルブシートに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Fe-based sintered valve seat having high density, high strength, excellent abrasion resistance and low aggressiveness to a partner.
【０００２】[0002]
【従来の技術】近年、焼結方法が進歩し、鉄基焼結合金
からなる各種機械部品を精度良く大量生産ができるよう
になり、エンジンのバルブシートも焼結により製造する
ようになってきた。焼結バルブシートの一例として、Ｃ
ｒ：１〜３重量％、Ｍｏ：０．５〜３重量％、Ｎｉ：
０．５〜３重量％、Ｃｏ：２〜８重量％、Ｃ：０．６〜
１．５重量％、Ｎｂ：０．２〜１重量％を含有し、残り
がＦｅおよび不可避不純物からなる組成ならびにパーラ
イト相およびベーナイト相を主体とした組織からなる鉄
基合金素地中にＣｒ：２５〜４５重量％、Ｗ：２０〜３
０重量％、Ｃｏ：２０〜３０重量％、Ｃ：１〜３重量
％、Ｓｉ：０．２〜２重量％、Ｎｂ：０．２〜２重量％
を含有し、残りがＦｅおよび不可避不純物からなる組成
を有する硬質粒子と、Ｃｏ：５５〜８５重量％、Ｃｒ：
２５〜３２重量％、Ｍｏ：７〜１０重量％、Ｓｉ：１．
５〜３．５重量％を含有し、残りがＦｅおよび不可避不
純物からなる組成の硬質粒子が合計で１０〜２５重量％
が均一に分散した組織を有する鉄基焼結合金で構成され
た焼結バルブシートが知られている（特開平３―１５８
４４５号公報参照）。2. Description of the Related Art In recent years, sintering methods have advanced, and various types of mechanical parts made of an iron-based sintered alloy can be mass-produced with high precision. Valve seats of engines have also been manufactured by sintering. . As an example of a sintered valve seat, C
r: 1 to 3% by weight, Mo: 0.5 to 3% by weight, Ni:
0.5 to 3% by weight, Co: 2 to 8% by weight, C: 0.6 to
Cr: 25% in an iron-based alloy base material containing 1.5% by weight and Nb: 0.2 to 1% by weight, the balance being Fe and inevitable impurities, and a structure mainly composed of a pearlite phase and a bainite phase. ~ 45% by weight, W: 20 ~ 3
0% by weight, Co: 20 to 30% by weight, C: 1 to 3% by weight, Si: 0.2 to 2% by weight, Nb: 0.2 to 2% by weight
And hard particles having a composition consisting of Fe and unavoidable impurities, the balance being: 55 to 85% by weight of Co,
25 to 32% by weight, Mo: 7 to 10% by weight, Si: 1.
Hard particles having a composition of 5 to 3.5% by weight, the balance being Fe and inevitable impurities are 10 to 25% by weight in total
There is known a sintered valve seat made of an iron-based sintered alloy having a structure in which is dispersed uniformly (JP-A-3-158).
No. 445).
【０００３】[0003]
【発明が解決しようとする課題】前記従来の焼結バルブ
シートは素地中に硬質粒子を均一分散させているために
優れた耐摩耗性を示すものの、近年、高性能化、高燃費
化、軽量化を追求して開発され実用化されているエンジ
ンでは燃料を燃焼室内に直接噴射する直噴エンジンや空
燃比を高め希薄燃焼させるリーンバーンエンジンなどで
は燃焼室内が従来のエンジンよりも高温になり、かかる
高温下では従来のバルブシートでは十分な耐摩耗性が得
られず、さらに相手材であるバルブを激しく摩耗させる
という欠点があった。The above-mentioned conventional sintered valve seat shows excellent wear resistance because hard particles are uniformly dispersed in a base material. However, in recent years, high performance, high fuel efficiency, and light weight have been achieved. In engines that have been developed and put into practical use in pursuit of realization, in direct injection engines that directly inject fuel into the combustion chamber, and in lean burn engines that increase the air-fuel ratio and perform lean combustion, the combustion chamber becomes hotter than conventional engines. At such a high temperature, the conventional valve seat cannot provide sufficient abrasion resistance, and further has the disadvantage of severely abrading the valve as a mating member.
【０００４】[0004]
【課題を解決するための手段】そこで、本発明者らは、
上述のような観点から、高温下で従来よりも耐摩耗性に
優れかつ相手材であるバルブに対する相手攻撃性の少な
い焼結バルブシートを得るべく研究を行なっていたとこ
ろ、 （ａ）Ｃｕ：１５〜４０重量％、Ｎｉ：０．５〜１５重
量％、Ｃ：０．０００５〜０．８５重量％を含有し、残
りがＦｅおよび不可避不純物からなる組成有するＦｅ基
合金で構成された焼結バルブシートは、従来の焼結バル
ブシートよりも強度および耐摩耗性が格段に優れ、かつ
相手攻撃性が少ない、（ｂ）この（ａ）に記載のＦｅ基
焼結バルブシートは、Ｆｅを主成分とするＦｅ基合金相
をＣｕを主成分とするＣｕ基合金相で包囲することによ
り、Ｆｅ基合金相とＦｅ基合金相をＣｕ基合金相により
結合した状態の組織を有する、（ｃ）前記Ｆｅを主成分
とするＦｅ基合金相はＮｉ，ＣｕおよびＣを含みかつＦ
ｅを５０重量％以上含むＦｅ合金相であり、前記Ｃｕを
主成分とするＣｕ基合金相はＮｉ、ＦｅおよびＣを含み
かつＣｕを５０重量％以上含むＣｕ合金相であり、前記
Ｆｅ基合金相に含まれるＮｉおよびＣの濃度は、前記Ｃ
ｕ基合金相に含まれるＮｉおよびＣの濃度よりも大きい
ことが一層好ましい、（ｄ）前記Ｆｅ基焼結バルブシー
トの密度は、７．０〜８．２Ｍｇ／ｍ3の範囲内にある
ことが一層好ましい、（ｅ）前記Ｆｅ基焼結バルブシー
トはＦｅ粉末およびＣｕ−Ｎｉ合金粉末を配合し、さら
に必要に応じてこれにＣ粉末を配合し混合して得られた
混合粉末を圧密成形し焼結して得ることができる、など
の知見を得たのである。Means for Solving the Problems Accordingly, the present inventors have:
From the above viewpoints, studies have been conducted to obtain a sintered valve seat that is superior in wear resistance at a high temperature and has less aggressiveness to a valve that is a mating material at high temperatures. (A) Cu: 15 Sintering valve comprising an Fe-based alloy containing -40% by weight, Ni: 0.5-15% by weight, C: 0.0005-0.85% by weight, and the balance being Fe and unavoidable impurities. The seat is much more excellent in strength and wear resistance than conventional sintered valve seats, and has less opposing aggression. (B) The Fe-based sintered valve seat according to (a) contains Fe as a main component. (C) having a structure in which the Fe-based alloy phase and the Fe-based alloy phase are joined by the Cu-based alloy phase by surrounding the Fe-based alloy phase with a Cu-based alloy phase containing Cu as a main component. Fe-based with Fe as the main component The alloy phase contains Ni, Cu and C and is F
e is a Fe alloy phase containing 50% by weight or more, and the Cu-based alloy phase containing Cu as a main component is a Cu alloy phase containing Ni, Fe and C and containing 50% by weight or more of Cu, The concentration of Ni and C contained in the phase is
(d) The density of the Fe-based sintered valve seat is more preferably higher than the concentration of Ni and C contained in the u-based alloy phase, in the range of 7.0 to 8.2 Mg / m 3. (E) The Fe-based sintered valve seat is obtained by blending Fe powder and Cu-Ni alloy powder, and further blending and mixing C powder with the powder if necessary. And obtained it by sintering.
【０００５】この発明は、かかる知見に基づいてなされ
たものであって、即ち、 （１）Ｃｕ：１５〜４０重量％、Ｎｉ：０．５〜１５重
量％、Ｃ：０．０００５〜０．８５重量％を含有し、残
りがＦｅおよび不可避不純物からなる組成を有する高強
度Ｆｅ基焼結バルブシート。 （２）Ｃｕ：１５〜４０重量％、Ｎｉ：０．５〜１５重
量％、Ｃ：０．０００５〜０．８５重量％を含有し、残
りがＦｅおよび不可避不純物からなる組成を有し、かつ
Ｆｅを主成分とするＦｅ基合金相をＣｕを主成分とする
Ｃｕ基合金相で結合してなる組織を有する高強度Ｆｅ基
焼結バルブシート。 （３）前記Ｆｅを主成分とするＦｅ基合金相はＮｉ、Ｃ
ｕおよびＣを含みＦｅを５０重量％以上含むＦｅ合金相
であり、Ｃｕを主成分とするＣｕ基合金相はＮｉ、Ｆｅ
およびＣを含みＣｕを５０重量％以上含むＣｕ合金相で
あり、かつＦｅ基合金相に含まれるＮｉおよびＣ濃度
は、Ｃｕ基合金相に含まれるＮｉおよびＣの濃度よりも
大きい前記（２）記載の高強度Ｆｅ基焼結バルブシー
ト。 （４）前記高強度Ｆｅ基焼結バルブシートは密度：７．
０〜８．２Ｍｇ／ｍ3を有する前記（１）または（２）
記載の高強度Ｆｅ基焼結バルブシート、に特徴を有する
ものである。The present invention has been made on the basis of such findings, that is, (1) Cu: 15 to 40% by weight, Ni: 0.5 to 15% by weight, and C: 0.0005 to 0. A high-strength Fe-based sintered valve seat having a composition of 85% by weight, the balance being Fe and unavoidable impurities. (2) Cu: 15 to 40% by weight, Ni: 0.5 to 15% by weight, C: 0.0005 to 0.85% by weight, the balance being Fe and inevitable impurities, and A high-strength Fe-based sintered valve seat having a structure in which an Fe-based alloy phase containing Fe as a main component is bonded with a Cu-based alloy phase containing Cu as a main component. (3) The Fe-based alloy phase containing Fe as a main component is Ni, C
An Fe alloy phase containing u and C and containing 50% by weight or more of Fe, and a Cu-based alloy phase containing Cu as a main component is Ni, Fe
(2) is a Cu alloy phase containing at least 50% by weight of Cu containing Cu and C, and the concentration of Ni and C contained in the Fe-based alloy phase is higher than the concentration of Ni and C contained in the Cu-based alloy phase. The high-strength Fe-based sintered valve seat as described in the above. (4) The high-strength Fe-based sintered valve seat has a density of 7.
The above (1) or (2) having 0 to 8.2 Mg / m 3.
The high-strength Fe-based sintered valve seat described above has characteristics.
【０００６】この発明の高強度Ｆｅ基焼結バルブシート
は、Ｆｅ粉末、Ｃｕ−Ｎｉ合金粉末およびＣ粉末を混合
し、圧密成形し、焼結することにより作ることができ
る。しかし、この発明の高強度Ｆｅ基焼結バルブシート
のＣ含有量が極めて少ない場合は、Ｃ粉末を添加するこ
となくＦｅ粉末に含まれるＣを利用して製造することが
できる。The high-strength Fe-based sintered valve seat of the present invention can be manufactured by mixing Fe powder, Cu-Ni alloy powder and C powder, compacting and sintering. However, when the C content of the high-strength Fe-based sintered valve seat of the present invention is extremely small, it can be produced using C contained in the Fe powder without adding C powder.
【０００７】この発明は高強度Ｆｅ基焼結バルブシート
の製造方法を一層具体的に述べると、原料粉末として、
Ｆｅ粉末、黒鉛粉末およびＣｕ−Ｎｉ合金粉末を用意
し，Ｆｅ粉末およびＣｕ−Ｎｉ合金粉末からなる配合粉
末、またはＦｅ粉末、Ｃｕ−Ｎｉ合金粉末および黒鉛粉
末からなる配合粉末を金型成形時の潤滑剤（例えば、ス
テアリン酸亜鉛粉末またはエチレンビスステアラミド）
とともにダブルコーンミキサーで混合し、プレス成形し
て圧粉体を作製し、圧粉体を水素を含む窒素雰囲気中、
温度：１１００〜１３００℃（一層好ましくは１１１０
〜１２５０℃）焼結する。The present invention more specifically describes a method for producing a high-strength Fe-based sintered valve seat.
A Fe powder, a graphite powder and a Cu-Ni alloy powder are prepared, and a compound powder composed of an Fe powder and a Cu-Ni alloy powder, or a compound powder composed of an Fe powder, a Cu-Ni alloy powder and a graphite powder is used for molding. Lubricants (eg, zinc stearate powder or ethylene bisstearamide)
Together with a double cone mixer, press molding to produce a green compact, and press the green compact in a nitrogen atmosphere containing hydrogen.
Temperature: 1100-1300 ° C (more preferably 1110
1250 ° C.) Sinter.
【０００８】この発明の高強度Ｆｅ基焼結バルブシート
を焼結する際のメカニズムは、下記のごとくであると考
える。すなわち、焼結初期段階においてＣｕ−Ｎｉ合金
の固溶共存域に昇温すると、液層が出現することにより
ＦｅとＣｕ−Ｎｉ合金の密着性が向上する。この時、液
層の発生は部分的であるがゆえに、焼結体に歪み、撓み
などの変形は生じない。ＦｅとＣｕ−Ｎｉ合金の密着性
が向上すると、Ｃｕ−Ｎｉ合金粉末のＮｉはＦｅ粉末中
へ拡散し、焼結後期段階においてはＣｕ−Ｎｉ合金粉末
中のＮｉがＦｅ粉末中へ拡散するところからＣｕ−Ｎｉ
合金粉末のＮｉ含有量が下がって融点が下がり、一気に
Ｃｕ−Ｎｉ合金粉末は融解し、多量の液層が発生してダ
イナミックな液層焼結が進行し、その結果、焼結体が緻
密化する。焼結後期段階の焼結体の緻密化は、密着性が
向上した後での緻密化であるために、焼結体の変形は生
じない。さらに焼結中にＣｕ合金液相は、Ｆｅ粉末内の
粒界にも浸透してＦｅ粉末を粒界で分断し、その結果と
して微細なＦｅ基合金相をＣｕを主成分とするＣｕ基合
金相で結合した状態の組織が形成される。前述のよう
に、Ｃｕ−Ｎｉ合金粉末のＮｉはＦｅ粉末中へ拡散し、
Ｆｅ基合金相に含まれるＮｉ量は、Ｃｕ基合金相に含ま
れるＮｉ量よりも多くなり、この時Ｆｅ粉末に含まれる
Ｃまたは添加したＣもＣｕ−Ｎｉ合金粉末中に拡散し、
ＮｉおよびＣを含むＣｕを主成分とするＣｕ基合金相が
生成する。なお、焼結初期段階において、Ｃｕ−Ｎｉ合
金の固溶共存域まで昇温されない場合でも、ＮｉがＦｅ
粉末中に拡散することによりＣｕ−Ｎｉ合金の融点が低
下し、上記と同様のメカニズムにより焼結が進行する。The mechanism for sintering the high-strength Fe-based sintered valve seat of the present invention is considered to be as follows. That is, when the temperature is raised to the solid solution coexistence region of the Cu-Ni alloy in the initial stage of sintering, the adhesion of Fe and the Cu-Ni alloy is improved by the appearance of a liquid layer. At this time, since the generation of the liquid layer is partial, the sintered body is not deformed such as distortion and bending. When the adhesion between Fe and the Cu-Ni alloy is improved, the Ni of the Cu-Ni alloy powder diffuses into the Fe powder, and in the late stage of sintering, the Ni in the Cu-Ni alloy powder diffuses into the Fe powder. From Cu-Ni
The melting point of the alloy powder decreases due to a decrease in the Ni content of the alloy powder, and the Cu-Ni alloy powder melts at a stretch, a large amount of liquid layer is generated, and dynamic liquid layer sintering proceeds, and as a result, the sintered body is densified. I do. Since the densification of the sintered body in the latter stage of sintering is the densification after the adhesion is improved, the sintered body is not deformed. Further, during sintering, the liquid phase of the Cu alloy penetrates into the grain boundaries in the Fe powder and divides the Fe powder at the grain boundaries. As a result, the fine Fe-based alloy phase becomes a Cu-based alloy containing Cu as a main component. Tissues are formed that are connected in phase. As described above, Ni of the Cu-Ni alloy powder diffuses into the Fe powder,
The amount of Ni contained in the Fe-based alloy phase is larger than the amount of Ni contained in the Cu-based alloy phase. At this time, C contained in the Fe powder or added C also diffuses into the Cu-Ni alloy powder,
A Cu-based alloy phase mainly composed of Cu containing Ni and C is generated. In the initial stage of sintering, even if the temperature is not raised to the solid solution coexistence region of the Cu-Ni alloy, Ni is added to Fe.
The diffusion into the powder lowers the melting point of the Cu—Ni alloy, and sintering proceeds by the same mechanism as described above.
【０００９】この発明の高強度Ｆｅ基焼結バルブシート
の焼結は前述のようなメカニズムによるものと考えられ
るから、この発明の高強度Ｆｅ基焼結バルブシートを製
造する際に使用する原料粉末として、特にＣｕ−Ｎｉ合
金（Ｎｉ：２~５０重量％を含有し、残部が不可避不純
物からなる母合金）粉末を使用することが重要な構成の
一つである。さらにＣは、Ｆｅ粉末を還元し、Ｆｅ粉末
の強度および耐摩耗性を向上させるために必要な元素で
あるが、Ｆｅ粉末に含まれるＣが多量であるとＣｕに対
する濡れ性を悪くなるために、Ｃｕ合金液相がＦｅ粉末
内の粒界に浸透するのを阻害し、微細なＦｅ基合金相が
得られなくなる。したがって、Ｃ粉末の添加は０．８５
重量％以下に抑えなければなさない。Since the sintering of the high-strength Fe-based sintered valve seat of the present invention is considered to be based on the above-described mechanism, the raw material powder used in manufacturing the high-strength Fe-based sintered valve seat of the present invention is used. In particular, it is one of the important constitutions to use a Cu—Ni alloy (a mother alloy containing 2 to 50% by weight of Ni and the balance of unavoidable impurities). Further, C is an element necessary for reducing the Fe powder and improving the strength and wear resistance of the Fe powder. However, a large amount of C contained in the Fe powder deteriorates the wettability to Cu. In addition, the Cu alloy liquid phase is prevented from penetrating into the grain boundaries in the Fe powder, and a fine Fe-based alloy phase cannot be obtained. Therefore, the addition of C powder is 0.85
It must be kept below weight%.
【００１０】つぎに、この発明の高強度Ｆｅ基焼結バル
ブシートの合金成分組成を上記のごとく限定した理由に
ついて説明する。 （ａ）Ｃｕ Ｃｕは、密度、強度および耐摩耗性を向上させる効果が
あるが、その含有量が１５重量％未満ではその効果が十
分でなく、一方、４０重量％を越えるとかえって強度が
低下するようになるので好ましくない。したがって、Ｃ
ｕの含有量は１５〜４０重量％に定めた。Ｃｕの含有量
の一層好ましい範囲は２０〜３５重量％である。Next, the reason why the alloy composition of the high-strength Fe-based sintered valve seat of the present invention is limited as described above will be described. (A) Cu Cu has the effect of improving the density, strength and abrasion resistance. However, if its content is less than 15% by weight, its effect is not sufficient, while if it exceeds 40% by weight, the strength is rather reduced. Is not preferred. Therefore, C
The content of u is set to 15 to 40% by weight. A more preferable range of the Cu content is 20 to 35% by weight.
【００１１】（ｂ）Ｎｉ Ｎｉは、Ｃｕ合金相中においてＣｕ合金相の融点を上昇
させ、液相焼結をコントロールし、また強度および靱性
を向上させる作用があるが、その含有量が０．５重量％
未満ではその効果が十分でなく、一方、１５重量％を越
えて含有してもそれ以上の効果が少ない。したがって、
Ｎｉの含有量は０．５〜１５重量％に定めた。Ｎｉの含
有量の一層好ましい範囲は１〜４重量％である。(B) Ni Ni has the effect of increasing the melting point of the Cu alloy phase in the Cu alloy phase, controlling liquid phase sintering, and improving the strength and toughness. 5% by weight
If the content is less than 15% by weight, the effect is not sufficient. Therefore,
The content of Ni was set to 0.5 to 15% by weight. A more preferable range of the Ni content is 1 to 4% by weight.
【００１２】（３）Ｃ ＣはＦｅ粉末を還元し、また強度および耐摩耗性を向上
させる作用があるが、その含有量が０．０００５重量％
未満では効果が十分でなく、一方、０．８５重量％を越
えて含有するとＣｕ合金液相のＦｅ粉末粒界への浸透を
阻害し、Ｆｅ粉末が微細化せず、強度および靱性を低下
させるので好ましくない。したがって、Ｃの含有量は
０．０００５〜０．８５重量％に定めた。Ｃの含有量の
一層好ましい範囲は０．００１〜０．３重量％であり、
さらに一層好ましい範囲は０．００２〜０．２重量％で
ある。(3) C C has the effect of reducing Fe powder and improving strength and wear resistance, but its content is 0.0005% by weight.
If the content is less than 0.85% by weight, on the other hand, if the content exceeds 0.85% by weight, the penetration of the Cu alloy liquid phase into the grain boundaries of the Fe powder is inhibited, and the Fe powder does not become fine and the strength and toughness are reduced. It is not preferable. Therefore, the content of C is set to 0.0005 to 0.85% by weight. A more preferable range of the content of C is 0.001 to 0.3% by weight,
An even more preferred range is from 0.002 to 0.2% by weight.
【００１３】[0013]
【実施例１】原料粉末として、平均粒径：５５μｍのＦ
ｅ粉末、表１に示される平均粒径および成分組成を有す
るＣｕ−Ｎｉ合金粉末Ａ〜Ｅ、および平均粒径：１８μ
ｍの黒鉛粉末を用意した。Example 1 As raw material powder, F having an average particle size of 55 μm was used.
e-powder, Cu-Ni alloy powders A to E having the average particle size and component composition shown in Table 1, and average particle size: 18 µm
m of graphite powder was prepared.
【００１４】[0014]
【表１】 [Table 1]
【００１５】これら原料粉末を表２〜表３に示される配
合組成となるように配合し、さらに金型成型時の潤滑剤
であるステアリン酸亜鉛粉末を外掛けで０．８重量％に
当たる量だけ添加してダブルコーンミキサーで混合し、
プレス成形して所定のバルブシートの圧粉体を作製し
た。この圧粉体をＮ２−５％Ｈ２の混合雰囲気中、温
度：１１２０℃、２０分保持の条件で焼結したのち、
０．５℃／ｓｅｃの冷却速度で冷却し、表２〜表３に示
される成分組成を有する本発明焼結バルブシート１〜１
４および比較焼結バルブシート１〜５を作製した。さら
に、Ｃｒ：２重量％、Ｍｏ：１．５重量％、Ｎｉ：１．
５重量％、Ｃｏ：５重量％、Ｃ：１．０重量％、Ｎｂ：
０．６重量％、を含有し、残りがＦｅおよび不可避不純
物からなる組成並びにパーライト相およびベーナイト相
を主体とした組織からなる素地にＣｒ：３５重量％、
Ｗ：２５重量％、Ｃｏ：２５重量％、Ｃ：２重量％、Ｓ
ｉ：１．１重量％、Ｎｂ：１．１重量％、を含有し、残
りがＦｅおよび不可避不純物からなる組成を有する硬質
粒子と、Ｃｏ：５７重量％、Ｃｒ：２８重量％、Ｍｏ：
８重量％、Ｓｉ：２．５重量％を含有し、残りがＦｅお
よび不可避不純物からなる組成の硬質粒子が合計で１７
重量％が均一に分散した組織を有する鉄基焼結合金で構
成された従来焼結バルブシートを用意した。These raw material powders are blended so as to have the composition shown in Tables 2 and 3, and zinc stearate powder, which is a lubricant at the time of molding the mold, is used in an amount equivalent to 0.8% by weight on the outer surface. Add and mix with a double cone mixer,
Press molding was performed to produce a green compact of a predetermined valve seat. After sintering this green compact in a mixed atmosphere of N2-5% H2 at a temperature of 1120 ° C. and holding for 20 minutes,
Cooled at a cooling rate of 0.5 ° C./sec, and sintered valve seats of the present invention having component compositions shown in Tables 2 and 3
4 and comparative sintered valve seats 1 to 5 were produced. Further, Cr: 2% by weight, Mo: 1.5% by weight, Ni: 1.
5% by weight, Co: 5% by weight, C: 1.0% by weight, Nb:
0.6% by weight, the balance being Cr and 35% by weight in a base having a composition mainly composed of Fe and unavoidable impurities and a structure mainly composed of a pearlite phase and a bainite phase.
W: 25% by weight, Co: 25% by weight, C: 2% by weight, S
i: 1.1% by weight, Nb: 1.1% by weight, the balance being hard particles having a composition of Fe and unavoidable impurities, Co: 57% by weight, Cr: 28% by weight, Mo:
Hard particles having a composition of 8% by weight and 2.5% by weight of Si and the balance of Fe and inevitable impurities are 17 in total.
A conventional sintered valve seat made of an iron-based sintered alloy having a structure in which weight% is uniformly dispersed was prepared.
【００１６】本発明焼結バルブシート、比較焼結バルブ
シートおよび従来焼結バルブシートの耐摩耗性はＳＵＨ
３６の材質からなる外径が３０ｍｍの傘部分を有するバ
ルブを用意して、このバルブの傘部分を温度：９００℃
に保持し、さらに本発明焼結バルブシート１〜１４、比
較焼結バルブシート１〜５および従来焼結バルブシート
をバルブとの接触により加熱し、ガソリン燃焼雰囲気中
で着座荷重：４０Ｋｇ、バルブ着座回数：３０００回／
分の条件で１００時間試験し、バルブシートおよびバル
ブの最大摩耗量を測定し、その結果を表３に示した。The wear resistance of the sintered valve seat of the present invention, the comparative sintered valve seat and the conventional sintered valve seat is SUH.
A valve having an umbrella portion made of 36 materials and having an outer diameter of 30 mm was prepared.
Further, the sintered valve seats of the present invention 1 to 14, the comparative sintered valve seats 1 to 5 and the conventional sintered valve seat are heated by contact with the valve, and a seating load: 40 kg in a gasoline combustion atmosphere, valve seating. Number of times: 3000 times /
The test was conducted for 100 hours under the conditions of minutes, and the maximum wear amount of the valve seat and the valve was measured. The results are shown in Table 3.
【００１７】[0017]
【表２】 [Table 2]
【００１８】[0018]
【表３】 [Table 3]
【００１９】[0019]
【発明の効果】以上述べたように、この発明の高強度Ｆ
ｅ基焼結バルブシートは、摩耗量が少なく、さらに相手
材であるバルブに対する相手攻撃性が少ないことから、
エンジンなどの自動車産業の発展に大いに貢献し得るも
のである。As described above, the high strength F of the present invention is obtained.
Since the e-based sintered valve seat has a small amount of wear and a low aggressiveness against a valve as a mating material,
It can greatly contribute to the development of the automotive industry such as engines.
Claims (4)
〜１５重量％、Ｃ：０．０００５〜０．８５重量％を含
有し、残りがＦｅおよび不可避不純物からなる組成を有
することを特徴とする高強度Ｆｅ基焼結バルブシート。1. Cu: 15 to 40% by weight, Ni: 0.5
A high-strength Fe-based sintered valve seat characterized in that it contains 〜15% by weight and C: 0.0005-0.85% by weight, and the balance has a composition consisting of Fe and unavoidable impurities.
〜１５重量％、Ｃ：０．０００５〜０．８５重量％を含
有し、残りがＦｅおよび不可避不純物からなる組成を有
し、かつＦｅを主成分とするＦｅ基合金相をＣｕを主成
分とするＣｕ基合金相で結合してなる組織を有すること
を特徴とする高強度Ｆｅ基焼結バルブシート。2. Cu: 15 to 40% by weight, Ni: 0.5
-15% by weight, C: 0.0005-0.85% by weight, the balance being a composition comprising Fe and unavoidable impurities, and a Fe-based alloy phase containing Fe as a main component containing Cu as a main component. A high-strength Fe-based sintered valve seat having a structure formed by bonding with a Cu-based alloy phase.
Ｎｉ、ＣｕおよびＣを含みＦｅを５０重量％以上含むＦ
ｅ合金相であり、Ｃｕを主成分とするＣｕ基合金相はＮ
ｉ、ＦｅおよびＣを含みＣｕを５０重量％以上 含むＣ
ｕ合金相であり、かつＦｅ基合金相に含まれるＮｉおよ
びＣ濃度は、Ｃｕ基合金相に含まれるＮｉおよびＣの濃
度よりも大きいことを特徴とする請求項２記載の高強度
Ｆｅ基焼結バルブシート。3. The Fe-based alloy phase containing Fe as a main component contains Ni, Cu and C, and contains F at 50% by weight or more.
e alloy phase, and the Cu-based alloy phase containing Cu as a main component is N
C containing i, Fe and C and containing 50% by weight or more of Cu
3. The high-strength Fe-based sintering according to claim 2, wherein the concentration of Ni and C contained in the u-based alloy phase and contained in the Fe-based alloy phase is higher than the concentrations of Ni and C contained in the Cu-based alloy phase. Tire valve seat.
密度：７．０〜８．２Ｍｇ／ｍ3を有することを特徴と
する請求項１、２または３記載の高強度Ｆｅ基焼結バル
ブシート。4. The high-strength Fe-based sintered valve seat,
Density: high strength Fe Motoshoyui valve seat according to claim 1, 2 or 3, wherein the having 7.0~8.2Mg / m 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22129498A JP3346292B2 (en) | 1998-08-05 | 1998-08-05 | High strength Fe-based sintered valve seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22129498A JP3346292B2 (en) | 1998-08-05 | 1998-08-05 | High strength Fe-based sintered valve seat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000054088A true JP2000054088A (en) | 2000-02-22 |
| JP3346292B2 JP3346292B2 (en) | 2002-11-18 |
Family
ID=16764541
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22129498A Expired - Fee Related JP3346292B2 (en) | 1998-08-05 | 1998-08-05 | High strength Fe-based sintered valve seat |
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| Country | Link |
|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2870328B1 (en) | 2012-07-04 | 2016-11-16 | Bleistahl-Produktions GmbH & Co KG. | Highly thermally conductive valve seat ring |
-
1998
- 1998-08-05 JP JP22129498A patent/JP3346292B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2870328B1 (en) | 2012-07-04 | 2016-11-16 | Bleistahl-Produktions GmbH & Co KG. | Highly thermally conductive valve seat ring |
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| Publication number | Publication date |
|---|---|
| JP3346292B2 (en) | 2002-11-18 |
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