JP2643742B2 - Two-layer valve seat made of lead impregnated iron-based sintered alloy for internal combustion engines - Google Patents
Two-layer valve seat made of lead impregnated iron-based sintered alloy for internal combustion enginesInfo
- Publication number
- JP2643742B2 JP2643742B2 JP32727892A JP32727892A JP2643742B2 JP 2643742 B2 JP2643742 B2 JP 2643742B2 JP 32727892 A JP32727892 A JP 32727892A JP 32727892 A JP32727892 A JP 32727892A JP 2643742 B2 JP2643742 B2 JP 2643742B2
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- layer
- sintered alloy
- based sintered
- mhv
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
- F01L3/04—Coated valve members or valve-seats
Description
【０００１】[0001]
【産業上の利用分野】この発明は、苛酷な条件下での使
用でもすぐれた耐摩耗性を発揮し、かつ相手攻撃性も著
しく低い内燃機関用鉛含浸鉄系焼結合金製２層バルブシ
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 a two-layer valve seat made of a lead-impregnated iron-based sintered alloy for an internal combustion engine, which exhibits excellent wear resistance even under severe conditions and has a remarkably low aggressiveness against a partner. It is about.
【０００２】[0002]
【従来の技術】従来、一般に自動車はじめ、各種内燃機
関のバルブシートとして、数多くのものが提案されてい
る。2. Description of the Related Art Conventionally, a large number of valve seats have been proposed for various internal combustion engines such as automobiles.
【０００３】[0003]
【発明が解決しようとする課題】一方、近年の各種内燃
機関の高性能化および高速化はめざましく、これに伴な
い、これの構造部材であるバルブシートの使用環境も一
段と苛酷さを増す状況にあり、これに対応するためより
一層耐摩耗性にすぐれたバルブシートの開発が強く望ま
れている。On the other hand, in recent years, the performance and speed of various internal combustion engines have been remarkably improved, and accordingly, the use environment of the valve seat, which is a structural member of the internal combustion engines, has become more severe. In order to cope with this, it is strongly desired to develop a valve seat having more excellent wear resistance.
【０００４】[0004]
【課題を解決するための手段】そこで、本発明者等は、
上述のような観点から、耐摩耗性のすぐれたバルブシー
トを開発すべく研究を行なった結果、バルブシートを、
いずれも５〜２０％の空孔率を有するＦｅ基焼結合金の
バルブ当接層と、これと一体焼結結合されたＦｅ基焼結
合金のバックアップ層の２層構造とすると共に、上記バ
ルブ当接層を、 マイクロビッカース硬さ（ＭＨｖ）：７００〜１８００
を有するＦｅ−Ｃｒ−Ｗ−Ｃｏ系合金の第１分散相：３
〜１５％、 ＭＨｖ：４００〜８００を有するＦｅ−Ｃｒ−Ｍｏ−Ｗ
−Ｖ系合金の第２分散相：５〜３０％、 さらに、必要に応じて、 ＭＨｖ：５００〜１０００を有するＣｏ−Ｃｒ−Ｍｏ系
合金の第３分散相：２〜１２％、 ＭＨｖ：１００〜４００を有するＦｅ−Ｃｏ系合金の素
地：残り、 からなる組成（以上重量％）を有するＦｅ基焼結合金で
構成し、かつ上記バックアップ層を、ＭＨｖ：１００〜
３００を有するＦｅ−Ｃｒ系焼結合金で構成し、さらに
上記空孔にＰｂまたはＰｂ合金を含浸すると、この結果
の鉛含浸鉄系焼結合金製２層バルブシートは、苛酷な条
件下での実用に際してすぐれた耐摩耗性を発揮すると共
に、相手攻撃性もきわめて低いという研究結果を得たの
である。Means for Solving the Problems Accordingly, the present inventors have
From the above viewpoints, we conducted research to develop valve seats with excellent wear resistance, and as a result,
Each has a two-layer structure of a valve contact layer made of an Fe-based sintered alloy having a porosity of 5 to 20% and a backup layer made of an Fe-based sintered alloy integrally sintered with the valve contact layer. Micro-Vickers hardness (MHv): 700 to 1800
First dispersed phase of Fe-Cr-W-Co-based alloy having: 3
Fe-Cr-Mo-W with MHv: 400-800
-Second dispersed phase of V-based alloy: 5 to 30%, and, if necessary, third dispersed phase of Co-Cr-Mo-based alloy having MHv: 500 to 1000: 2 to 12%, MHv: 100 Base of Fe-Co based alloy having the following composition: Fe-Co based alloy having the following composition (more than weight%):
When the hole is impregnated with Pb or a Pb alloy, the resulting two-layer valve seat made of a lead-impregnated iron-based sintered alloy can be used under severe conditions. Research has shown that it exhibits excellent wear resistance in practical use and has extremely low opponent aggression.
【０００５】この発明は、上記の研究結果にもとづいて
なされたものであって、Ｆｅ基焼結合金のバルブ当接層
と、これと一体焼結結合されたＦｅ基焼結合金のバック
アップ層の２層構造、並びに５〜２５％の空孔率を有す
る鉄系焼結合金基体にＰｂまたはＰｂ合金を含浸してな
る鉛含浸鉄系焼結合金製２層バルブシートにして、上記
バルブ当接層を、重量％で、 ＭＨｖ：７００〜１８００を有するＦｅ−Ｃｒ−Ｗ−Ｃ
ｏ系合金の第１分散相：３〜１５％、 ＭＨｖ：４００〜８００を有するＦｅ−Ｃｒ−Ｍｏ−Ｗ
−Ｖ系合金の第２分散相：５〜３０％、 さらに、必要に応じて、 ＭＨｖ：５００〜１０００を有するＣｏ−Ｃｒ−Ｍｏ系
合金の第３分散相：２〜１２％、 ＭＨｖ：１００〜４００を有するＦｅ−Ｃｏ系合金の素
地：残り、 からなる組成を有するＦｅ基焼結合金で構成し、かつ上
記バックアップ層を、ＭＨｖ：１００〜３００を有する
Ｆｅ−Ｃｒ系焼結合金で構成してなる、耐摩耗性にすぐ
れ、さらに相手攻撃性も小さい内燃機関用鉛含浸鉄系焼
結合金製２層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 research results, and comprises a valve contact layer made of an Fe-based sintered alloy and a backup layer made of an Fe-based sintered alloy integrally sintered with the valve contact layer. A two-layer valve seat made of a lead-impregnated iron-based sintered alloy in which Pb or a Pb alloy is impregnated into an iron-based sintered alloy base having a two-layer structure and a porosity of 5 to 25%, The layer is made up of, by weight, Fe-Cr-WC with MHv: 700-1800
Fe-Cr-Mo-W having first dispersed phase of o-based alloy: 3 to 15%, MHv: 400 to 800
-Second dispersed phase of V-based alloy: 5 to 30%, and, if necessary, third dispersed phase of Co-Cr-Mo-based alloy having MHv: 500 to 1000: 2 to 12%, MHv: 100 Base of Fe-Co alloy having the following composition: Fe-Co based alloy having the following composition: and the backup layer is formed of the Fe-Cr based alloy having the MHv: 100-300. The two-layer valve seat made of a lead-impregnated iron-based sintered alloy for an internal combustion engine, which has excellent wear resistance and low aggressiveness to a partner, is characterized.
【０００６】なお、この発明の２層バルブシートにおい
て、上記バルブ当接層を構成するＦｅ基焼結合金の第１
分散相は、重量％で、Ｃｒ：２５〜４５％、 Ｗ：
２０〜３０％、Ｃｏ：２０〜３０％、 Ｎｂ：０．２
〜２％、Ｃ：１〜３％、を含有し、残りがＦｅと不可避
不純物からなる組成を有するＦｅ−Ｃｒ−Ｗ−Ｃｏ系合
金、同じく第２分散相は、Ｃ：０．７〜２％、 Ｓ
ｉ：０．１〜０．５、Ｍｎ：０．１〜０．５％、Ｃｒ：
２〜６％、Ｍｏ：２〜１０％、 Ｖ：１〜６％、
Ｗ：１〜１０％、を含有し、さらに必要に応じて、Ｃ
ｏ：０．２〜１０％、を含有し、残りがＦｅと不可避不
純物からなる組成を有するＦｅ−Ｃｒ−Ｍｏ−Ｗ−Ｖ系
合金、また同じく素地中に分散相として必要に応じて含
有される第３分散相は、Ｃｒ：２５〜３２％、 Ｍ
ｏ：７〜１０％、Ｓｉ：１．５〜３．５％、を含有し、
残りがＣｏと不可避不純物からなるＣｏ−Ｃｒ−Ｍｏ系
合金、同じく素地は、Ｎｉ：０．５〜４％、 Ｃ：
０．５〜１．５％、Ｍｏ：０．５〜３％、 Ｃｏ：２
〜１０％、を含有し、さらに必要に応じて、Ｃｒ：０．
５〜５％、 Ｎｂ：０．１〜２％、Ｍｎ：０．１〜１
％、のうちの１種または２種以上、を含有し、残りがＦ
ｅと不可避不純物からなる組成を有するＦｅ−Ｃｏ系合
金で構成するのが望ましく、さらにバックアップ層のＦ
ｅ−Ｃｒ系焼結合金は、Ｃ：０．３〜１．２％、Ｃｒ：
１．２〜３．５％、Ｍｏ：０．１〜１％、を含有し、残
りがＦｅと不可避不純物からなる組成をもつのが望まし
い。[0006] In the two-layer valve seat of the present invention, the first base material of the Fe-based sintered alloy constituting the valve contact layer is used.
The dispersed phase is, by weight%, Cr: 25 to 45%, W:
20-30%, Co: 20-30%, Nb: 0.2
Fe-Cr-W-Co-based alloy having a composition consisting of Fe and unavoidable impurities, the second dispersed phase comprising C: 0.7 to 2%. %, S
i: 0.1 to 0.5, Mn: 0.1 to 0.5%, Cr:
2-6%, Mo: 2-10%, V: 1-6%,
W: 1 to 10%, and if necessary, C
o: 0.2 to 10%, the balance being Fe-Cr-Mo-WV-based alloy having a composition consisting of Fe and unavoidable impurities, and also optionally contained as a dispersed phase in the matrix. The third dispersed phase is: Cr: 25 to 32%, M
o: 7 to 10%, Si: 1.5 to 3.5%,
Co-Cr-Mo based alloy consisting of Co and unavoidable impurities, Ni: 0.5-4%, C:
0.5 to 1.5%, Mo: 0.5 to 3%, Co: 2
-10%, and if necessary, Cr: 0.
5-5%, Nb: 0.1-2%, Mn: 0.1-1
%, One or more of the above, with the balance being F
and an Fe-Co-based alloy having a composition of unavoidable impurities.
The e-Cr-based sintered alloy has C: 0.3 to 1.2%, and Cr:
It is desirable that the composition contains 1.2 to 3.5% and Mo: 0.1 to 1%, with the balance being Fe and unavoidable impurities.
【０００７】したがって、この発明の２層のバルブシー
トを構成するバルブ当接層における上記第１分散相、第
２分散相、第３分散相、および素地、並びに同じくバッ
クアップ層は、これをそれぞれ上記のＦｅ−Ｃｒ−Ｗ−
Ｃｏ系合金、Ｆｅ−Ｃｒ−Ｍｏ−Ｗ−Ｖ系合金、Ｃｏ−
Ｃｒ−Ｍｏ系合金、およびＦｅ−Ｃｏ系合金、並びにＦ
ｅ−Ｃｒ系焼結合金で構成することにより上記の硬さを
もつようになり、上記バルブ当接層においては、上記第
１および第２分散相の含有割合をそれぞれ３〜１５％お
よび５〜３０％とし、かつ必要に応じて含有される第３
相のそれを２〜１２％とすることにより、これらと素地
の間に効果的硬さバランスが形成されてすぐれた耐摩耗
性と低い相手攻撃性が確保されるようになり、またバッ
クアップ層においては、上記組成のＦｅ基焼結合金によ
って所望の強度と、上記バルブ当接層と近似した熱膨張
係数が確保されるのである。Therefore, the first dispersed phase, the second dispersed phase, the third dispersed phase, and the base material in the valve contact layer constituting the two-layer valve seat of the present invention, and the backup layer, respectively, Fe-Cr-W-
Co-based alloy, Fe-Cr-Mo-WV-based alloy, Co-
Cr-Mo based alloy, Fe-Co based alloy, and F
By being composed of an e-Cr-based sintered alloy, it has the above hardness, and in the valve contact layer, the content ratio of the first and second dispersed phases is 3 to 15% and 5 to 5%, respectively. 30%, and the third component contained as necessary
By setting the phase to 2 to 12%, an effective hardness balance is formed between these and the base to ensure excellent abrasion resistance and low opponent aggression. As a result, a desired strength and a thermal expansion coefficient close to that of the valve contact layer are secured by the Fe-based sintered alloy having the above composition.
【０００８】また、この発明の２層バルブシートを構成
する鉄系焼結合金基体の空孔率を５〜２０％と定めたの
は、空孔率が５％未満では鉛含浸が十分に行なわれず、
苛酷な条件下での相手攻撃性が大きくなり、一方空孔率
が２５％を越えると、バルブ当接層の摩耗進行が促進さ
れるようになるという理由にもとづくものである。Further, the porosity of the iron-based sintered alloy base constituting the two-layer valve seat of the present invention is set to 5 to 20%, because if the porosity is less than 5%, lead impregnation is sufficiently performed. Not
This is based on the reason that when the porosity exceeds 25%, the abrasion of the valve contact layer is accelerated when the aggressiveness under severe conditions is increased.
【０００９】[0009]
【実施例】つぎに、この発明の２層バルブシートを実施
例により具体的に説明する。原料粉末として、それぞれ
表１〜４に示される硬さおよび組成をもったバルブ当接
層の第１分散相第２分散相、および第３分散相形成のた
めの粒度：８０mesh以下のＦｅ−Ｃｒ−Ｗ−Ｃｏ系合金
粉末、Ｆｅ−Ｃｒ−Ｍｏ−Ｗ−Ｖ系合金粉末、およびＣ
ｏ−Ｃｒ−Ｍｏ系合金粉末、さらにバルブ当接層の素地
およびバックアップ層形成のための同じくいずれも１０
０mesh以下の粒度を有するＦｅ粉末、Ｆｅ−１％Ｃｒ−
０．３％Ｍｎ合金粉末、Ｆｅ−１３％Ｃｒ合金粉末、Ｆ
ｅ−１３％Ｃｒ−５％Ｎｂ合金粉末、Ｆｅ−７５％Ｍｎ
粉末、Ｆｅ−６０％Ｎｂ粉末、Ｃｏ粉末、Ｎｉ粉末、Ｍ
ｏ粉末、および黒鉛粉末を用意し、これら原料粉末をそ
れぞれ表５〜７に示される配合組成に配合し、ステアリ
ン酸：１％を加えてミキサーにて混合してバルブ当接層
およびバックアップ層形成のための混合粉末とし、これ
らの混合粉末を表８〜１０に示される組合せで、かつ両
層の相対割合が重量比でバルブ当接層／バックアップ層
＝４／６となる割合で金型内に装入し、２〜７ton ／cm
2 の範囲内の所定の圧力で圧粉体にプレス成形し、この
圧粉体を５００℃に３０分間保持して脱脂（上記ステア
リン酸の除去）し、ついでアンモニア分解ガス雰囲気
中、１１００〜１２００℃の範囲内の所定温度に１時間
保持の条件で焼結して、配合組成と実質的に同一の組
成、同じく表８〜１０に示されるバルブ当接層硬さ、バ
ックアップ層硬さ、および空孔率を有し、さらにいずれ
も外径：３４mm×内径：２７mm×厚さ：７mmの寸法をも
った鉄系焼結合金基体を形成し、これに、表８〜１０に
示される組合せで、窒素雰囲気中、浴表面に８kg／cm2
の圧力を付加した状態で、６００℃に加熱した純鉛また
はＰｂ−３５％Ｓｎ合金の浴中に１時間浸漬保持の条件
で鉛含浸を施すことにより本発明２層バルブシート１〜
１８および比較２層バルブシート１〜１２をそれぞれ製
造した。Next, the two-layer valve seat of the present invention will be described in detail with reference to examples. Fe-Cr having a particle size of 80 mesh or less for forming a first dispersed phase, a second dispersed phase, and a third dispersed phase of a valve contact layer having the hardness and composition shown in Tables 1 to 4, respectively, as raw material powders -W-Co alloy powder, Fe-Cr-Mo-WV alloy powder, and C
o-Cr-Mo-based alloy powder, and 10% each for forming a base material of a valve contact layer and a backup layer.
Fe powder having a particle size of 0 mesh or less, Fe-1% Cr-
0.3% Mn alloy powder, Fe-13% Cr alloy powder, F
e-13% Cr-5% Nb alloy powder, Fe-75% Mn
Powder, Fe-60% Nb powder, Co powder, Ni powder, M
o powder and graphite powder were prepared, and these raw material powders were respectively blended into the blending compositions shown in Tables 5 to 7, and 1% of stearic acid was added and mixed with a mixer to form a valve contact layer and a backup layer. Powders in the mold in the combinations shown in Tables 8 to 10 and in a ratio where the relative proportions of both layers are valve contact layer / backup layer = 4/6 by weight. 2-7ton / cm
The green compact is press-molded at a predetermined pressure within the range of 2 , and the green compact is held at 500 ° C. for 30 minutes to degrease (removal of the above stearic acid). Sintering at a predetermined temperature within a range of 1 ° C. for 1 hour, and having substantially the same composition as the blended composition, the valve contact layer hardness, the backup layer hardness, and the same as shown in Tables 8 to 10, and An iron-based sintered alloy substrate having a porosity, and further having dimensions of outer diameter: 34 mm × inner diameter: 27 mm × thickness: 7 mm was formed. 8kg / cm 2 on bath surface in nitrogen atmosphere
Is applied in a bath of pure lead or a Pb-35% Sn alloy heated to 600 ° C. for 1 hour under the condition of dipping and holding, whereby the two-layer valve seats 1 to 5 of the present invention are obtained.
18 and comparative two-layer valve seats 1 to 12 were produced, respectively.
【００１０】[0010]
【表１】 [Table 1]
【００１１】[0011]
【表２】 [Table 2]
【００１２】[0012]
【表３】 [Table 3]
【００１３】[0013]
【表４】 [Table 4]
【００１４】[0014]
【表５】 [Table 5]
【００１５】[0015]
【表６】 [Table 6]
【００１６】[0016]
【表７】 [Table 7]
【００１７】[0017]
【表８】 [Table 8]
【００１８】[0018]
【表９】 [Table 9]
【００１９】[0019]
【表１０】 [Table 10]
【００２０】なお、比較２層バルブシートは、これを構
成する鉄系焼結合金基体の空孔率、バルブ当接層の第１
分散相、第２分散相、および素地、並びにバックアップ
層の硬さ、さらに前記第１分散相および第２分散相の含
有割合のうちの少なくともいずれか（表に＊印を付した
もの）がこの発明の範囲から外れたものである。The comparative two-layer valve seat has the porosity of the iron-based sintered alloy base constituting the valve seat and the first of the valve contact layer.
The hardness of the disperse phase, the second disperse phase and the substrate, and the hardness of the backup layer, and at least one of the content ratios of the first disperse phase and the second disperse phase (those marked with * in the table) are determined by this It is outside the scope of the invention.
【００２１】つぎに、この結果得られた２層バルブシー
トについて、 バルブの材質：ＳＵＨ３６、 バルブの加熱温度：８００℃ バルブの着座回数：３０００回／分、 雰囲気：０．４kg／cm2 の圧力のプロパンガスと、１．
６ｌ／min の流量の酸素による燃焼ガス、 バルブシートの表面加熱温度（内部水冷）：３５０℃、 試験時間：５０時間、 の条件で摩耗試験を行ない、バルブシートの最大摩耗深
さと、相手部材であるバルブの最大摩耗深さを測定し
た。これらの測定結果を表８〜１０に示した。Next, regarding the two-layer valve seat obtained as a result, the material of the valve: SUH36, the heating temperature of the valve: 800 ° C. The number of times of seating of the valve: 3000 times / minute, the atmosphere: the pressure of 0.4 kg / cm 2 Of propane gas and
An abrasion test was performed under the following conditions: combustion gas with oxygen at a flow rate of 6 l / min, surface heating temperature of the valve seat (internal water cooling): 350 ° C., test time: 50 hours. The maximum wear depth of a valve was measured. The results of these measurements are shown in Tables 8 to 10.
【００２２】[0022]
【発明の効果】表８〜１０に示される結果から、本発明
２層バルブシート１〜１８は、いずれもすぐれた耐摩耗
性を示し、かつ相手攻撃性もきわめて小さいのに対し
て、比較２層バルブシート１〜１２に見られるように２
層バルブシートを構成する条件のうちのいずれかがこの
発明の範囲から外れると、バルブ当接層においては耐摩
耗性および相手攻撃性のうちの少なくともいずれかが劣
ったものになり、またバックアップ層においては、バル
ブ当接層に対する焼結時の収縮割合が相対的に大きくな
ってバルブシートに変形が生じたり、これ自体の材料強
度が低下することが明らかである。上述のように、この
発明の２層バルブシートは、苛酷な条件下での実用に際
しても、相手部材の摩耗を著しく抑制した状態で、きわ
めて長期に亘ってすぐれた耐摩耗性を発揮するのであ
る。From the results shown in Tables 8 to 10, all of the two-layer valve seats 1 to 18 of the present invention show excellent abrasion resistance and extremely low opponent aggression. 2 as seen in layer valve seats 1-12
If any of the conditions constituting the layer valve seat deviate from the scope of the present invention, at least one of the wear resistance and the aggressiveness in the valve contact layer becomes inferior, and the backup layer It is clear that the shrinkage ratio during sintering with respect to the valve contact layer becomes relatively large, and the valve seat is deformed or the material strength of the valve seat itself decreases. As described above, the two-layer valve seat of the present invention exhibits excellent wear resistance over a very long period of time even in practical use under severe conditions, with the wear of the mating member being significantly suppressed. .
Claims (2)
と一体焼結結合されたＦｅ基焼結合金のバックアップ層
の２層構造、並びに５〜２５％の空孔率を有する鉄系焼
結合金基体にＰｂまたはＰｂ合金を含浸してなる鉛含浸
鉄系焼結合金製２層バルブシートにして、 上記バルブ当接層を、 マイクロビッカース硬さ（ＭＨｖ）：７００〜１８００
を有するＦｅ−Ｃｒ−Ｗ−Ｃｏ系合金の第１分散相：３
〜１５％、 ＭＨｖ：４００〜８００を有するＦｅ−Ｃｒ−Ｍｏ−Ｗ
−Ｖ系合金の第２分散相：５〜３０％、 ＭＨｖ：１００〜４００を有するＦｅ−Ｃｏ系合金の素
地：残り、 からなる組成（以上重量％）を有するＦｅ基焼結合金で
構成し、 かつ上記バックアップ層を、ＭＨｖ：１００〜３００を
有するＦｅ−Ｃｒ系焼結合金で構成したことを特徴とす
る耐摩耗性のすぐれた内燃機関用鉛含浸鉄系焼結合金製
２層バルブシート。1. A two-layer structure of a valve contact layer of an Fe-based sintered alloy, a backup layer of an Fe-based sintered alloy integrally bonded to the valve contact layer, and iron having a porosity of 5 to 25%. A two-layer valve seat made of a lead-impregnated iron-based sintered alloy in which Pb or a Pb alloy is impregnated into a base sintered alloy base, and the valve contact layer is made of micro Vickers hardness (MHv): 700 to 1800
First dispersed phase of Fe-Cr-W-Co-based alloy having: 3
Fe-Cr-Mo-W with MHv: 400-800
A second dispersed phase of a V-based alloy: 5 to 30%, a base material of an Fe-Co-based alloy having an MHv: 100 to 400: the remainder, and a Fe-based sintered alloy having a composition of And the backup layer is made of a Fe-Cr-based sintered alloy having an MHv of 100 to 300, and a two-layer valve seat made of a lead-impregnated iron-based sintered alloy for internal combustion engines having excellent wear resistance. .
と一体焼結結合されたＦｅ基焼結合金のバックアップ層
の２層構造、並びに５〜２５％の空孔率を有する鉄系焼
結合金基体にＰｂまたはＰｂ合金を含浸してなる鉛含浸
鉄系焼結合金製２層バルブシートにして、 上記バルブ当接層を、 マイクロビッカース硬さ（ＭＨｖ）：７００〜１８００
を有するＦｅ−Ｃｒ−Ｗ−Ｃｏ系合金の第１分散相：３
〜１５％、 ＭＨｖ：４００〜８００を有するＦｅ−Ｃｒ−Ｍｏ−Ｗ
−Ｖ系合金の第２分散相：５〜３０％、 ＭＨｖ：５００〜１０００を有するＣｏ−Ｃｒ−Ｍｏ系
合金の第３分散相：２〜１２％、 ＭＨｖ：１００〜４００を有するＦｅ−Ｃｏ系合金の素
地：残り、 からなる組成（以上重量％）を有するＦｅ基焼結合金で
構成し、 かつ上記バックアップ層を、ＭＨｖ：１００〜３００を
有するＦｅ−Ｃｒ系焼結合金で構成したことを特徴とす
る耐摩耗性のすぐれた内燃機関用鉛含浸鉄系焼結合金製
２層バルブシート。2. A two-layer structure of a valve contact layer of an Fe-based sintered alloy, a backup layer of an Fe-based sintered alloy integrally bonded to the valve contact layer, and iron having a porosity of 5 to 25%. A two-layer valve seat made of a lead-impregnated iron-based sintered alloy in which Pb or a Pb alloy is impregnated into a base sintered alloy base, and the valve contact layer is made of micro Vickers hardness (MHv): 700 to 1800
First dispersed phase of Fe-Cr-W-Co-based alloy having: 3
Fe-Cr-Mo-W with MHv: 400-800
A second dispersed phase of a V-based alloy: 5 to 30%; a third dispersed phase of a Co—Cr—Mo based alloy having an MHv: 500 to 1000: Fe—Co having an MHv: 100 to 400; Base material of the base alloy: Remaining, composed of a Fe-based sintered alloy having a composition (more than weight%) consisting of: and the backup layer was formed of a Fe-Cr-based sintered alloy having an MHv of 100 to 300. A two-layer valve seat made of a lead impregnated iron-based sintered alloy for an internal combustion engine having excellent wear resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32727892A JP2643742B2 (en) | 1992-11-12 | 1992-11-12 | Two-layer valve seat made of lead impregnated iron-based sintered alloy for internal combustion engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32727892A JP2643742B2 (en) | 1992-11-12 | 1992-11-12 | Two-layer valve seat made of lead impregnated iron-based sintered alloy for internal combustion engines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06145719A JPH06145719A (en) | 1994-05-27 |
| JP2643742B2 true JP2643742B2 (en) | 1997-08-20 |
Family
ID=18197344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32727892A Expired - Lifetime JP2643742B2 (en) | 1992-11-12 | 1992-11-12 | Two-layer valve seat made of lead impregnated iron-based sintered alloy for internal combustion engines |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2643742B2 (en) |
-
1992
- 1992-11-12 JP JP32727892A patent/JP2643742B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06145719A (en) | 1994-05-27 |
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| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19970401 |