JP3331963B2 - Sintered valve seat and method for manufacturing the same - Google Patents
Sintered valve seat and method for manufacturing the sameInfo
- Publication number
- JP3331963B2 JP3331963B2 JP12529498A JP12529498A JP3331963B2 JP 3331963 B2 JP3331963 B2 JP 3331963B2 JP 12529498 A JP12529498 A JP 12529498A JP 12529498 A JP12529498 A JP 12529498A JP 3331963 B2 JP3331963 B2 JP 3331963B2
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- JP
- Japan
- Prior art keywords
- weight
- sintered
- valve seat
- alloy phase
- sintered valve
- Prior art date
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Description
【０００１】[0001]
【発明の属する技術分野】この発明は、耐摩耗性に優れ
かつ相手攻撃性の少ない焼結バルブシートおよびその製
造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintered valve seat having excellent wear resistance and low aggressiveness to a counterpart, and a method for producing the same.
【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に生産できるよう
になり、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、Ｃｒ：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鉄基合金素地中
に、Ｃｒ：２５〜４５重量％、Ｗ：２０〜３０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（特開平３−１５８４４５号公報
参照）。2. Description of the Related Art In recent years, sintering methods have been advanced, and various types of mechanical parts made of iron-based sintered alloys can be produced in large quantities with high precision. Valve seats have also been manufactured by sintering. As an example of a sintered valve seat, Cr: 1-3
% 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 1.5% by weight, Nb: 0.2 to 1% % By weight, the balance being Fe: 25% to 45% by weight, W: 20% to 30% by weight in an iron-based alloy base having a composition composed of Fe and inevitable impurities and a structure mainly composed of a pearlite phase and a bainite phase. ,
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,
Hard particles having a composition consisting of Fe and inevitable impurities, Co: 55 to 85% by weight, Cr: 25 to 32
% By weight, Mo: 7 to 10% by weight, Si: 1.5 to 3.5%
2. Description of the Related Art There is known a sintered valve seat made of an iron-based sintered alloy having a structure in which hard particles having a composition of 10% to 25% by weight are uniformly dispersed in which hard particles having a composition containing Fe and unavoidable impurities have a total of 10 to 25% by weight. (See JP-A-3-158445).
【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燃料
を燃焼室内に直接噴射する直噴射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. In a direct-injection engine that directly injects fuel developed and put into practical use in pursuit of weight reduction and a lean-burn engine that raises the air-fuel ratio and performs lean combustion, the temperature in the combustion chamber becomes higher than that of conventional engines. At high temperatures, conventional valve seats do not provide sufficient wear resistance,
Further, there is a drawback that the valve, which is the mating material, is severely worn.
【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っていたとこ
ろ、 （ａ）Ｆｅ粉末、Ｃ粉末およびＣｕ−Ｎｉ合金粉末を混
合し、成形し、焼結することにより得られたＣｕ：２
０．３〜４０重量％、Ｎｉ：０．６〜１４重量％、Ｃ：
１．０〜３．０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基合金相で接合して
なる素地中に平均粒径：１０μｍ以下の微細な遊離黒鉛
相が析出分散している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優れ、かつ相手攻撃性が少な
い、 （ｂ）この鉄基焼結合金の素地を構成する前記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Ｆｅを５０重量％以上含むＦｅ合金相であり、前記Ｃ
ｕ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Ｃｕ基合金相に含まれるＮｉおよびＣの濃度よりも大
きい、 （ｃ）前記鉄基焼結合金の密度は、７．３〜７．９ｇ／
ｃｃの範囲内にあることが好ましい、などの知見を得た
のである。Means for Solving the Problems Accordingly, the present inventors have:
From the viewpoints described above, the research was conducted to obtain a sintered valve seat having higher abrasion resistance and lower aggressiveness against a valve as a mating material at a high temperature than a conventional one. C: 2 obtained by mixing, molding and sintering C powder and Cu-Ni alloy powder
0.3 to 40% by weight, Ni: 0.6 to 14% by weight, C:
A composition containing 1.0 to 3.0% by weight, with the balance being Fe and unavoidable impurities;
It is composed of an iron-based sintered alloy having a structure in which a fine free graphite phase having an average particle diameter of 10 μm or less is precipitated and dispersed in a base material obtained by joining a base alloy phase with a Cu-based alloy phase containing Cu as a main component. The sintered valve seat obtained is superior in strength and abrasion resistance and less aggressive to a partner than a conventional sintered valve seat. (B) The main component of the Fe constituting the base material of the iron-based sintered alloy Is an Fe alloy phase containing Ni, Cu and C and containing 50% by weight or more of Fe.
The Cu-based alloy phase containing u 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 Fe-based alloy phase is higher than the concentration of Ni and C contained in the Cu-based alloy phase. (C) The density of the iron-based sintered alloy is 7.3 to 7. .9g /
It was found that it is preferably within the range of cc.
【０００５】この発明は、かかる知見にもとづいて成さ
れたものであって、 （１）Ｃｕ：２０．３〜４０重量％、Ｎｉ：０．６〜１
４重量％、Ｃ：１．０〜３．０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素地中に平均粒径：１０μｍ以
下の微細な遊離黒鉛相が析出分散している組織を有する
鉄基焼結合金で構成された焼結バルブシートであって、
前記焼結バルブシートの素地を構成するＦｅを主成分と
するＦｅ基合金相はＮｉ、ＣｕおよびＣを含みＦｅを５
０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の濃度は、Ｃｕ基合金相に含まれ
るＮｉおよびＣの濃度よりも大きい焼結バルブシート、 （２）前記焼結バルブシートは、密度：７．３〜７．９
ｇ／ｃｃを有する前記（１）記載の焼結バルブシート、
に特徴を有するものである。The present invention has been made on the basis of the above findings. (1) Cu: 20.3 to 40% by weight, Ni: 0.6 to 1
4% by weight, C: 1.0 to 3.0% by weight, the balance being composed of Fe and unavoidable impurities, and Fe
Fe-based alloy phase whose main component is Cu and whose main component is Cu
A sintered valve seat made of an iron-based sintered alloy having a structure in which a fine free graphite phase having an average particle size of 10 μm or less is precipitated and dispersed in a base material combined with a base alloy phase,
The Fe-based alloy phase mainly composed of Fe constituting the base of the sintered valve seat contains Ni, Cu and C, and contains 5% Fe.
An Fe alloy phase containing 0% by weight or more, and a Cu-based alloy phase containing Cu as a main component contains Ni, Fe and C, and contains 50% of Cu.
(2) the sintered valve seat, which is a Cu alloy phase containing not less than% by weight 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 tied valve seat has a density of 7.3 to 7.9.
g / cc, the sintered valve seat according to the above (1),
It is characterized by the following.
【０００６】この発明の焼結バルブシートは、Ｆｅ粉
末、Ｃ粉末およびＣｕ−Ｎｉ合金粉末を混合し、成形
し、焼結することにより作られる。したがって、この発
明は、 （３）原料として、Ｆｅ粉末、Ｃ粉末およびＣｕ−Ｎｉ
合金粉末を混合し、成形し、焼結する前記（１）または
（２）記載の焼結バルブシートの製造方法、に特徴を有
するものである。The sintered valve seat of the present invention is made by mixing, molding and sintering Fe powder, C powder and Cu-Ni alloy powder. Therefore, the present invention provides: (3) Fe powder, C powder and Cu-Ni
The method according to (1) or (2), wherein the alloy powder is mixed, molded, and sintered.
【０００７】この発明の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、これら原料
粉末を金型成形時の潤滑剤である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：１１００〜１３
００℃で焼結する。焼結温度は１１００〜１２００℃が
一層好ましい。More specifically, the method for producing a sintered valve seat according to the present invention is as follows: Fe powder, graphite powder, and Cu-Ni alloy powder are prepared as raw material powders, and these raw material powders are lubricated during molding. The mixture is mixed with a zinc stearate powder or ethylene bisstearamide as an agent with a double cone mixer and press-molded to produce a green compact. The green compact is heated in a nitrogen atmosphere containing hydrogen at a temperature of 1100 to 13
Sinter at 00 ° C. The sintering temperature is more preferably 1100 to 1200 ° C.
【０００８】この発明の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られる。す
なわち、原料として添加した黒鉛粉末は焼結により一旦
素地中に固溶し、焼結後の冷却中に極めて微細な遊離黒
鉛となって旧気孔中に析出分散する。一方、焼結初期段
階においてＣｕ−Ｎｉ合金の固溶共存域に昇温し焼結体
にたわみ、歪みなどの変形が生じないように少量の液相
を出現させると、Ｃｕ−Ｎｉ合金粉末のＮｉはＦｅ粉末
中へ拡散してＦｅ粉末同士の接合強度を向上させる。焼
結後期段階においては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、ダイナ
ミックな液相焼結が進行して緻密化する。さらに焼結中
にＣｕはＦｅ粉末へ拡散する。この発明の焼結バルブシ
ートを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（Ｎ
ｉ：２〜５０重量％を含有し、残部がＣｕおよび不可避
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１つである。The mechanism for sintering the sintered valve seat of the present invention is considered to be as follows. That is, the graphite powder added as a raw material once forms a solid solution in the base material by sintering, becomes extremely fine free graphite during cooling after sintering, and is precipitated and dispersed in old pores. On the other hand, when the temperature is raised to the solid solution coexistence region of the Cu-Ni alloy in the initial stage of sintering, the sintered body bends and a small amount of liquid phase appears so that deformation such as distortion does not occur. Ni diffuses into the Fe powder to improve the bonding strength between the Fe powders. In the latter stage of sintering, the Ni content of the Cu-Ni alloy powder decreases as the Ni diffuses into the Fe powder, and the melting point decreases. The Cu-Ni alloy powder melts at a stretch and dynamic liquid phase sintering proceeds. To make it more dense. Further, during sintering, Cu diffuses into the Fe powder. The sintering of the sintered valve seat of the present invention is considered to be based on the mechanism described above. Therefore, as a raw material powder used for manufacturing the sintered valve seat of the present invention, a Cu-Ni alloy (N
One of the important constitutions is to use a mother alloy (i) powder containing i: 2 to 50% by weight and the balance being Cu and unavoidable impurities.
【０００９】つぎに、この発明の焼結バルブシートを構
成する鉄基焼結合金の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２０．３重量％未満では液相の発
生量が十分でなく、したがって密度、強度および耐摩耗
性の効果が十分でなく、一方、４０重量％を越えると液
相が過大となり、焼結中に変形が生じて寸法のバラツキ
が大きくなるので好ましくない。したがって、Ｃｕの含
有量は２０．３〜４０重量％に定めた。Ｃｕの含有量の
一層好ましい範囲は２５〜３５重量％である。Next, the reason why the component composition of the iron-based sintered alloy constituting the 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 wear resistance. However, if its content is less than 20.3% by weight, the amount of the liquid phase generated is not sufficient, and therefore the density, strength and wear resistance are insufficient. On the other hand, if it exceeds 40% by weight, the liquid phase becomes excessively large, resulting in deformation during sintering and large dimensional variation, which is not preferable. Therefore, the content of Cu is set to 20.3 to 40% by weight. A more preferred range for the Cu content is 25-35% by weight.
【００１０】（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Ｆｅ合金相の強
度および靭性を向上させる作用があるが、その含有量が
０．６重量％未満ではその効果が十分でなく、一方、１
４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０．６〜１４重量％に定め
た。Ｎｉの含有量の一層好ましい範囲は２〜６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 of the Fe alloy phase. If the amount is less than 0.6% by weight, the effect is not sufficient.
Even if the content exceeds 4% by weight, no further effect is obtained.
Therefore, the content of Ni is set to 0.6 to 14% by weight. A more preferable range of the Ni content is 2 to 6% by weight.
【００１１】（ｃ）Ｃ Ｃは、強度および硬さを向上させる作用があるが、その
含有量が１．０重量％未満では効果が十分でなく、一
方、３．０重量％を越えて含有する靭性を低下させるの
で好ましくない。したがって、Ｃの含有量は１．０〜
３．０重量％に定めた。Ｃの含有量の一層好ましい範囲
は１．１〜１．６重量％である。(C) C C has the effect of improving the strength and hardness. However, if the content is less than 1.0% by weight, the effect is not sufficient, while the content exceeds 3.0% by weight. This is not preferred because the resulting toughness is reduced. Therefore, the content of C is 1.0 to
It was determined to be 3.0% by weight. A more preferable range of the content of C is 1.1 to 1.6% by weight.
【００１２】[0012]
【発明の実施の形態】実施例１ 原料粉末として、平均粒径：５５μｍのＦｅ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、並びに平均粒径：１８μｍの黒鉛粉末
を用意した。EXAMPLES Example 1 Fe powder having an average particle size of 55 μm was used as a raw material powder.
Cu-Ni having the average particle size and component composition shown in
Alloy powders A to E and graphite powder having an average particle size of 18 μm were prepared.
【００１３】[0013]
【表１】 [Table 1]
【００１４】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、さらに金型成形時の潤滑剤
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、
プレス成形して外径：３４ｍｍ、内径：２７ｍｍ、厚
さ：７ｍｍの寸法を有するバルブシート形状圧粉体を作
製した。この圧粉体をＮ2 −５％Ｈ2 の混合雰囲気中、
温度：１１５０℃、２０分保持の条件で焼結し、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１〜１３および比較焼結バルブシート１〜６を作製し
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 mold molding, is applied in an amount equivalent to 0.8% by weight on an outer surface. Add and mix with a double cone mixer,
Press molding was performed to produce a valve seat-shaped green compact having dimensions of outer diameter: 34 mm, inner diameter: 27 mm, and thickness: 7 mm. This green compact is mixed in a mixed atmosphere of N 2 -5% H 2 ,
Temperature: 1150 ° C, sintering for 20 minutes, Table 2
Inventive sintered valve seats 1 to 13 and comparative sintered valve seats 1 to 6 having the component compositions shown in Table 3 were produced.
【００１５】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鉄基合金素地中
に、Ｃｒ：３５重量％、Ｗ：２５重量％、Ｃｏ：２５重
量％、Ｃ：２重量％、Ｓｉ：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：７０重量％、Ｃ
ｒ：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。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 Fe: 35% by weight, W: in an iron-based alloy base having a composition mainly composed of Fe and unavoidable impurities and a structure mainly composed of a pearlite phase and a bainite phase. : 25% by weight, Co: 25% by weight, C: 2% by weight, Si: 1.1% by weight, Nb: 1.
Hard particles having a composition of 1% by weight, the balance being Fe and unavoidable impurities;
r: 28% by weight, Mo: 8% by weight, Si: 2.5% by weight
, And a conventional sintered valve seat made of an iron-based sintered alloy having a structure in which a total of 17% by weight of hard particles having a composition of Fe and inevitable impurities are uniformly dispersed.
【００１６】この発明の焼結バルブシートの組織を理解
するために、本発明焼結バルブシート１〜１３の内で本
発明焼結バルブシート３を選んでこれを切断し、研磨
し、金属顕微鏡による組織写真を取り、その組織写真を
図１に示した。図２は本発明焼結バルブシート３の金属
組織の写生図である。図２において１はＦｅ基合金相、
２はＣｕ基合金相、３は遊離黒鉛相である。図１の組織
写真および図２金属組織の写生図から明らかなように、
本発明焼結バルブシート３はＦｅ基合金相をＣｕ基合金
相からなる結合相で結合してなる素地を有し、その素地
中に平均粒径：１０μｍ以下の微細な遊離黒鉛相が析出
分散していることが分かる。In order to understand the structure of the sintered valve seat of the present invention, the sintered valve seat 3 of the present invention is selected from the sintered valve seats 1 to 13 of the present invention, cut, polished, and subjected to a metallurgical microscope. Was taken, and the photograph of the structure is shown in FIG. FIG. 2 is a sketch drawing of the metal structure of the sintered valve seat 3 of the present invention. In FIG. 2, 1 is an Fe-based alloy phase,
2 is a Cu-based alloy phase and 3 is a free graphite phase. As is clear from the structure photograph of FIG. 1 and the sketch of the metal structure in FIG.
The sintered valve seat 3 of the present invention has a base material in which an Fe-based alloy phase is bonded with a binder phase composed of a Cu-based alloy phase, and a fine free graphite phase having an average particle size of 10 μm or less is dispersed and dispersed in the base material. You can see that it is doing.
【００１７】さらに、前記本発明焼結バルブシート３の
組織のＦｅ基合金相およびＣｕ基合金相の成分含有量を
ＥＰＭＡにより測定した結果、前記Ｆｅ基合金相はＮ
ｉ、ＣｕおよびＣを含みかつＦｅを５０重量％以上含
み、前記Ｃｕ基合金相はＮｉ、ＦｅおよびＣを含みかつ
Ｃｕを５０重量％以上含み、さらにＦｅ基合金相に含ま
れるＮｉおよびＣの濃度は、Ｃｕ基合金相に含まれるＮ
ｉおよびＣの濃度よりも大であることを確認した。Further, as a result of measuring the component contents of the Fe-based alloy phase and the Cu-based alloy phase in the structure of the sintered valve seat 3 of the present invention by EPMA, it was found that the Fe-based alloy phase was N
i, containing Cu and C and containing 50% by weight or more of Fe, and the Cu-based alloy phase containing Ni, Fe and C and containing 50% by weight or more of Cu, and further containing Ni and C contained in the Fe-based alloy phase. The concentration is determined by the amount of N contained in the Cu base alloy phase.
It was confirmed that the concentration was higher than the concentrations of i and C.
【００１８】一方、ＳＵＨ３６の材質からなり外径が３
０ｍｍの傘部分を有するバルブを用意した。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１〜１３、比較焼結バルブシート１〜６お
よび従来焼結バルブシートをそれぞれ内部が水冷されて
いる治具に圧入し、ガソリン燃焼雰囲気中で着座荷重：
３０ｋｇ、バルブ着座回数：３０００回／分の条件で１
００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４に示した。On the other hand, it is made of SUH36 and has an outer diameter of 3 mm.
A valve having an umbrella portion of 0 mm was prepared. The umbrella portion of this valve is maintained at a temperature of 900 ° C., and the sintered valve seats 1 to 13 of the present invention, the comparative sintered valve seats 1 to 6 and the conventional sintered valve seat are each cooled to a jig which is internally cooled. Pressing and seating load in gasoline combustion atmosphere:
30 kg, valve seating frequency: 1 under the condition of 3000 times / minute
The test was performed for 00 hours, and the maximum wear of the valve seat and the valve was measured. The results are shown in Table 4.
【００１９】[0019]
【表２】 [Table 2]
【００２０】[0020]
【表３】 [Table 3]
【００２１】[0021]
【表４】 [Table 4]
【００２２】表２〜表４に示される結果から、本発明焼
結バルブシート１〜１３と従来焼結バルブシートを比較
すると、本発明焼結バルブシート１〜１３は従来焼結バ
ルブシートと比べて、バルブシート自体の最大摩耗量お
よび相手材であるバルブの最大摩耗量が少ないことが分
かる。しかし、この発明の範囲から外れている成分組成
を有する比較焼結バルブシート１〜６は、バルブシート
の最大摩耗量および相手材であるバルブの最大摩耗量の
うちの少なくともいずれかが好ましくない値を示すこと
が分かる。From the results shown in Tables 2 to 4, when the sintered valve seats 1 to 13 of the present invention are compared with the conventional sintered valve seats, the sintered valve seats 1 to 13 of the present invention are compared with the conventional sintered valve seats. Therefore, it can be seen that the maximum wear amount of the valve seat itself and the maximum wear amount of the valve as the mating material are small. However, the comparative sintered valve seats 1 to 6 having a component composition outside the range of the present invention have unfavorable values for at least one of the maximum wear amount of the valve seat and the maximum wear amount of the valve as the mating material. It can be seen that
【００２３】[0023]
【発明の効果】上述のように、この発明の焼結バルブシ
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ところから、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 sintered valve seat of the present invention contributes greatly to the development of the automotive industry such as engines because of the small amount of abrasion and the low aggressiveness of the opposing valve against the valve. What you get.
【図１】この発明の焼結バルブシートの金属顕微鏡によ
る組織写真である。FIG. 1 is a micrograph of a sintered valve sheet of the present invention, taken with a metallographic microscope.
【図２】この発明の焼結バルブシートの組織の写生図で
ある。FIG. 2 is a sketch drawing of the structure of the sintered valve seat of the present invention.
１ Ｆｅ基合金相、２ Ｃｕ基合金相、３ 遊離黒鉛相 1 Fe-based alloy phase, 2 Cu-based alloy phase, 3 free graphite phase
フロントページの続き (56)参考文献 特開 昭59−38354（ＪＰ，Ａ) 特開 昭60−165307（ＪＰ，Ａ) 特開 平５−271879（ＪＰ，Ａ) 特開 平９−329007（ＪＰ，Ａ) 特開 平９−68010（ＪＰ，Ａ) 特開 平３−82743（ＪＰ，Ａ) 特開 平10−8223（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C22C 38/00 304 B22F 5/00 C22C 33/02 F01L 3/02 Continuation of front page (56) References JP-A-59-38354 (JP, A) JP-A-60-165307 (JP, A) JP-A-5-271879 (JP, A) JP-A-9-329007 (JP) JP-A-9-68010 (JP, A) JP-A-3-82743 (JP, A) JP-A-10-8223 (JP, A) (58) Fields studied (Int. Cl. 7 , DB Name) C22C 38/00 304 B22F 5/00 C22C 33/02 F01L 3/02
Claims (3)
０．６〜１４重量％、Ｃ：１．０〜３．０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素地中に平均粒
径：１０μｍ以下の微細な遊離黒鉛相が析出分散してい
る組織を有する鉄基焼結合金で構成されている焼結バル
ブシートであって、 前記鉄基焼結合金の素地を構成するＦｅを主成分とする
Ｆｅ基合金相はＮｉ、Ｃｕ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Ｃ
ｕ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の濃度は、Ｃｕ基合金相に含まれるＮ
ｉおよびＣの濃度よりも大であることを特徴とする焼結
バルブシート。1. Cu: 20.3-40 % by weight, Ni:
0.6 to 14% by weight, C: 1.0 to 3.0% by weight, the remainder having a composition of Fe and unavoidable impurities, and a Fe-based alloy phase containing Fe as a main component containing Cu. A sintered valve made of an iron-based sintered alloy having a structure in which a fine free graphite phase having an average particle size of 10 μm or less is precipitated and dispersed in a base material combined with a Cu-based alloy phase as a main component. A Fe-based alloy phase containing Fe as a main component constituting the base of the iron-based sintered alloy is an Fe alloy phase containing Ni, Cu and C and containing 50% by weight or more of Fe, and mainly containing Cu; C as a component
The u-based alloy phase is a Cu alloy phase containing Ni, Fe and C and containing 50% by weight or more of Cu, and the concentration of Ni and C contained in the Fe-based alloy phase is determined by the concentration of N contained in the Cu-based alloy phase.
A sintered valve seat having a concentration greater than i and C.
鉄基焼結合金で構成されていることを特徴とする請求項
１記載の焼結バルブシート。2. The sintered valve seat according to claim 1, wherein the sintered valve seat is made of an iron-based sintered alloy having a density of 7.3 to 7.9 g / cc.
粉末を混合し、成形し、焼結することを特徴とする請求
項１または２記載の焼結バルブシートの製造方法。3. The method for producing a sintered valve seat according to claim 1, wherein Fe powder, C powder and Cu—Ni alloy powder are mixed, molded, and sintered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12529498A JP3331963B2 (en) | 1998-04-20 | 1998-04-20 | Sintered valve seat and method for manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12529498A JP3331963B2 (en) | 1998-04-20 | 1998-04-20 | Sintered valve seat and method for manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11302805A JPH11302805A (en) | 1999-11-02 |
| JP3331963B2 true JP3331963B2 (en) | 2002-10-07 |
Family
ID=14906534
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12529498A Expired - Fee Related JP3331963B2 (en) | 1998-04-20 | 1998-04-20 | Sintered valve seat and method for manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3331963B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012013226A1 (en) | 2012-07-04 | 2014-01-09 | Bleistahl-Produktions Gmbh & Co Kg | High heat conducting valve seat ring |
-
1998
- 1998-04-20 JP JP12529498A patent/JP3331963B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11302805A (en) | 1999-11-02 |
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