JP3077274B2 - Valve seat made of lead impregnated Fe-based sintered alloy with excellent wear resistance - Google Patents
Valve seat made of lead impregnated Fe-based sintered alloy with excellent wear resistanceInfo
- Publication number
- JP3077274B2 JP3077274B2 JP03190757A JP19075791A JP3077274B2 JP 3077274 B2 JP3077274 B2 JP 3077274B2 JP 03190757 A JP03190757 A JP 03190757A JP 19075791 A JP19075791 A JP 19075791A JP 3077274 B2 JP3077274 B2 JP 3077274B2
- Authority
- JP
- Japan
- Prior art keywords
- valve seat
- wear resistance
- impregnated
- based sintered
- lead
- 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 - Fee Related
Links
Landscapes
- Powder Metallurgy (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、すぐれた耐摩耗性を
有する鉛含浸Ｆｅ基焼結合金製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 valve seat made of a lead-impregnated Fe-based sintered alloy having excellent wear resistance.
【０００２】[0002]
【従来の技術】従来、一般に自動車はじめ、各種の内燃
機関のバルブシートの製造に、例えば特開平３−１３５
４６号公報に記載される鉛含浸Ｆｅ基焼結合金のほか、
その他多くの鉛含浸Ｆｅ基焼結材料が用いられている。2. Description of the Related Art Conventionally, the production of valve seats for various internal combustion engines such as automobiles has been disclosed in, for example, JP-A-3-135.
No. 46, a lead-impregnated Fe-based sintered alloy,
Many other lead-impregnated Fe-based sintered materials are used.
【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、これの機械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、バルブシートに対す
る耐摩耗性向上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 valve seats, which are mechanical structural members of such engines, has become more severe. Therefore, it is strongly desired to improve the wear resistance of the valve seat.
【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、重量％で（以下％
は重量％を示す）、 Ｃ ：１．０１〜１．５％、 Ｓｉ：０．１〜０．５％、 Ｍｎ：０．１〜０．５％、 Ｃｒ：２〜６％、 Ｍｏ：２〜１０％、 Ｖ ：１〜６％、 Ｗ ：１〜１０％、 Ｃｏ：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基合金粉末をプレス成形してなる圧粉体を焼結
して、５〜２５％の空孔率を有する焼結体とし、この結
果の前記Ｆｅ基合金粉末と実質的に同じ組成を有する焼
結体の空孔に、ＰｂまたはＰｂ合金を含浸してなる鉛含
浸Ｆｅ基焼結合金でバルブシートを構成すると、この結
果の鉛含浸Ｆｅ基焼結合金製バルブシートは、苛酷な条
件下での実用に際してもすぐれた耐摩耗性を示すという
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.
Represents weight%), C: 1.01 to 1.5%, Si: 0.1 to 0.5%, Mn: 0.1 to 0.5%, Cr: 2 to 6%, Mo: 2 -10%, V: 1-6%, W: 1-10%, Co: 0.2-10%, and the balance is press-formed of an Fe-based alloy powder having a composition of Fe and unavoidable impurities. And sintering the resulting green compact into a sintered body having a porosity of 5 to 25%. The resulting sintered body having substantially the same composition as the Fe-based alloy powder has When the valve seat is made of a lead-impregnated Fe-based sintered alloy impregnated with Pb or a Pb alloy, the resulting valve seat made of a lead-impregnated Fe-based sintered alloy has excellent resistance to practical use under severe conditions. The research result showed that it shows abrasion.
【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、以下にバルブシートを構成する
焼結体、すなわちＦｅ基合金粉末と同じ成分組成を有す
る焼結体の成分組成および空孔率を上記の通りに限定し
た理由を説明する。 （ａ）Ｃ Ｃ成分には、素地に固溶して、これの強度を向上させる
ほか、炭化物を形成して耐摩耗性を向上させる作用があ
るが、その含有量が１．０１％未満では所望のすぐれた
耐摩耗性向上効果が得られず、一方その含有量が１．５
％を越えると相手攻撃性が増大するようになることか
ら、その含有量を１．０１〜１．５％と定めた。The present invention has been made on the basis of the above research results. The following describes the sintered body constituting the valve seat, that is, the sintered body having the same composition as the Fe-based alloy powder. The reason why the porosity is limited as described above will be described. (A) CC The C component has a function of improving the abrasion resistance by forming a carbide in addition to improving the strength of the C component by dissolving in the base material. The desired excellent wear resistance improving effect cannot be obtained, while the content is 1.5
%, The opponent aggressiveness increases, so the content was determined to be 1.01 to 1.5%.
【０００６】（ｂ）ＳｉおよびＭｎ これらの成分には、脱酸作用のほか、強度を向上させる
作用があるが、その含有量が、Ｓｉ：０．１％未満であ
っても、またＭｎ：０．１％未満であっても前記作用に
所望の効果が得られず、一方その含有量がＳｉ：０．５
％およびＭｎ：０．５％を、それぞれ越えると、靭性が
低下するようになることから、その含有量を、それぞれ
Ｓｉ：０．１〜０．５％、Ｍｎ：０．１〜０．５％と定
めた。(B) Si and Mn These components have an effect of improving strength in addition to a deoxidizing effect. However, even if the content is less than 0.1% of Si, the content of Mn: Even if the content is less than 0.1%, a desired effect cannot be obtained in the above-described action, while the content is Si: 0.5.
% And Mn: 0.5%, respectively, the toughness is reduced. Therefore, the contents are respectively set to 0.1% to 0.5% for Si and 0.1% to 0.5% for Mn. %.
【０００７】（ｃ）Ｃｒ，Ｍｏ，Ｖ，およびＷ これらの成分には、いずれも共存した状態で、複炭化物
を形成して耐摩耗性を向上させる作用があり、したがっ
てこれらの成分のうちのいずれかの成分でも含有しなか
ったり、あるいは含有量が十分でない場合、すなわちＣ
ｒ：２％未満、Ｍｏ：２％未満、Ｖ：１％未満、および
Ｗ：１％未満である場合には、所望のすぐれた耐摩耗性
を確保することができず、一方その含有量が、Ｃｒ，Ｍ
ｏ，Ｖ，およびＷのうちのいずれかでも、それぞれＣ
ｒ：６％、Ｍｏ：１０％、Ｖ：６％、およびＷ：１０％
を越えると、相手攻撃性が急激に増大するようになるこ
とから、その含有量を、Ｃｒ：２〜６％、Ｍｏ：２〜１
０％、Ｖ：１〜６％、およびＷ：１〜１０％と定めた。(C) Cr, Mo, V, and W These components have the effect of forming a double carbide in the coexistence state to improve wear resistance, and therefore, of these components, If none of the components are contained or the content is not sufficient,
When r: less than 2%, Mo: less than 2%, V: less than 1%, and W: less than 1%, the desired excellent wear resistance cannot be ensured, while the content is low. , Cr, M
o, V, and W are each C
r: 6%, Mo: 10%, V: 6%, and W: 10%
, The aggressiveness of the opponent suddenly increases. Therefore, the content is set to 2% to 6% for Cr and 2 to 1% for Mo.
0%, V: 1 to 6%, and W: 1 to 10%.
【０００８】（ｄ）Ｃｏ Ｃｏ成分には、靭性および耐熱性を向上させる作用があ
るが、その含有量が０．２％未満では前記作用に所望の
効果が得られず、一方その含有量が１０％を越えてもよ
り一層の向上効果が得られないことから、その含有量を
０．２〜１０％と定めた。(D) Co The Co component has an effect of improving the toughness and heat resistance. However, if its content is less than 0.2%, the desired effect cannot be obtained in the above-mentioned effect. Even if it exceeds 10%, a further improvement effect cannot be obtained, so the content is set to 0.2 to 10%.
【０００９】（ｅ）空孔率 その値が５％未満では、焼結体に含浸されるＰｂまたは
Ｐｂ合金の含浸割合が低くなりすぎて相手攻撃性が増大
するようになり、一方その値が２５％を越えると耐摩耗
性の低下が著しくなることから、焼結体の空孔率を５〜
２５％と定めた。(E) Porosity When the porosity is less than 5%, the impregnation ratio of Pb or Pb alloy impregnated in the sintered body becomes too low, and the aggressiveness of the counterpart increases. If it exceeds 25%, the wear resistance is significantly reduced.
It was determined to be 25%.
【００１０】[0010]
【実施例】つぎに、この発明の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
１，２に示される成分組成および１００mesh以下の粒度
をもった水アトマイズのＦｅ基合金粉末を用い、これを
５〜７ ton／cm2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、真空中、１１５０〜１２５０
℃の範囲内の所定温度に１時間保持後、９００℃より焼
入れの条件で焼結して、実質的に上記Ｆｅ基合金粉末と
同じ成分組成並びに表１，２に示される空孔率をもった
焼結体を形成し、引続いてこれに窒素ガス雰囲気中、温
度：６００℃のＰｂ浴中に、８kg／cm2 の加圧力で１時
間保持の条件で鉛含浸を行なうことにより、外径：３４
mm×内径：２７mm×厚さ：７mmの寸法をもった本発明鉛
含浸Ｆｅ基焼結合金製バルブシート（以下本発明バルブ
シートという）１〜９、および比較鉛含浸Ｆｅ基焼結合
金製バルブシート（以下比較バルブシートという）１〜
１２をそれぞれ製造した。Next, the valve seat of the present invention will be described in detail with reference to examples. As the raw material powder, a water atomized Fe-based alloy powder having a component composition shown in Tables 1 and 2 and a particle size of 100 mesh or less was used, and was pressed at a predetermined pressure within a range of 5 to 7 ton / cm 2. It is press-molded into a powder, and this green compact is
After holding at a predetermined temperature within the range of 1 ° C. for 1 hour, sintering was performed at 900 ° C. under quenching conditions to have substantially the same composition as the Fe-based alloy powder and the porosity shown in Tables 1 and 2. A sintered body was formed, followed by lead impregnation in a Pb bath at a temperature of 600 ° C. in a nitrogen gas atmosphere at a pressure of 8 kg / cm 2 for 1 hour, thereby obtaining Diameter: 34
Valve seats made of lead-impregnated Fe-based sintered alloy of the present invention (hereinafter referred to as valve seats of the present invention) 1 to 9 having dimensions of mm × inner diameter: 27 mm × thickness: 7 mm, and comparative lead-impregnated Fe-based sintered alloy valves Seat (hereinafter referred to as comparative valve seat)
12 were each manufactured.
【００１１】なお、比較バルブシート１〜１２は、いず
れもこれを構成する焼結体において、構成成分のうちの
少なくともいずれかの成分含有量（表２に※印を付した
もの）、あるいは空孔率がこの発明の範囲から外れたも
のである。Each of the comparative valve seats 1 to 12 contains at least one of the constituents (indicated by * in Table 2) or empty in the sintered body constituting the same. The porosity is outside the scope of the invention.
【００１２】[0012]
【表１】 [Table 1]
【００１３】[0013]
【表２】 [Table 2]
【００１４】ついで、この結果得られた各種のバルブシ
ートについて、 バルブの材質：ＪＩＳ・ＳＵＨ−１１、 バルブの加熱温度：８００℃、 バルブの着座回数：３０００回／min 、 雰囲気：０．５kg／cm2 の圧力のプロパンガスと、流
量：１．５ｌ／min の酸素による燃焼ガス、 バルブシートの表面加熱温度（水冷）：３００〜３５０
℃、 試験時間：１００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１，２に示した。Then, for the various valve seats obtained as a result, the material of the valve: JIS SUH-11, the heating temperature of the valve: 800 ° C., the number of seating times of the valve: 3000 times / min, the atmosphere: 0.5 kg / Combustion gas with propane gas at a pressure of cm 2 and oxygen at a flow rate of 1.5 l / min, Surface heating temperature of valve seat (water cooling): 300 to 350
A wear test was performed under the following conditions: 100 ° C., test time: 100 hours, and the maximum wear depth of the valve seat and the maximum wear depth of the valve as the mating member were measured.
The results of these measurements are shown in Tables 1 and 2.
【００１５】[0015]
【発明の効果】表１，２に示される結果から、本発明バ
ルブシート１〜１０は、いずれもすぐれた耐摩耗性を示
し、かつ相手攻撃性も小さいのに対して、比較バルブシ
ート１〜１２に見られるように、焼結体の成分組成や空
孔率がこの発明の範囲から外れると上記特性のうちの少
なくともいずれかの特性が劣ったものになることが明ら
かである。From the results shown in Tables 1 and 2, all of the valve seats 1 to 10 of the present invention show excellent wear resistance and low aggressiveness on the other side, whereas the valve seats 1 to 10 of the present invention have a low abrasion resistance. As can be seen from FIG. 12, when the component composition and the porosity of the sintered body are out of the range of the present invention, it is apparent that at least one of the above-mentioned characteristics becomes inferior.
【００１６】上述のように、この発明の鉛含浸Ｆｅ基焼
結合金製バルブシートは、すぐれた耐摩耗性を有し、か
つ相手攻撃性も小さく、したがって苛酷な条件下での実
用に際してもすぐれた性能を長期に亘って発揮するので
ある。As described above, the valve seat made of a lead-impregnated Fe-based sintered alloy of the present invention has excellent wear resistance and low aggressiveness to a partner, and is therefore excellent in practical use under severe conditions. It demonstrates its performance over a long period of time.
Claims (1)
するＦｅ基合金粉末圧粉体の焼結体にして、この焼結体
は５〜２５％の空孔率を有し、かつこの焼結体の空孔に
ＰｂまたはＰｂ合金を含浸してなる鉛含浸Ｆｅ基焼結合
金で構成したことを特徴とする耐摩耗性にすぐれた鉛含
浸Ｆｅ基焼結合金製バルブシート。1. C .: 1.01 to 1.5%, Si: 0.1 to 0.5%, Mn: 0.1 to 0.5%, Cr: 2 to 6%, Mo by weight% : 2~10%, V: 1~6% , W: 1~10%, Co: 0.2~10%, contains, have a composition balance being Fe and inevitable impurities
Sintered body of the Fe-based alloy powder compact
Has a porosity of 5 to 25% and is made of a lead-impregnated Fe-based sintered alloy obtained by impregnating the pores of this sintered body with Pb or a Pb alloy. Excellent lead impregnated Fe-based sintered alloy valve seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03190757A JP3077274B2 (en) | 1991-07-04 | 1991-07-04 | Valve seat made of lead impregnated Fe-based sintered alloy with excellent wear resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03190757A JP3077274B2 (en) | 1991-07-04 | 1991-07-04 | Valve seat made of lead impregnated Fe-based sintered alloy with excellent wear resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH059669A JPH059669A (en) | 1993-01-19 |
| JP3077274B2 true JP3077274B2 (en) | 2000-08-14 |
Family
ID=16263229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03190757A Expired - Fee Related JP3077274B2 (en) | 1991-07-04 | 1991-07-04 | Valve seat made of lead impregnated Fe-based sintered alloy with excellent wear resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3077274B2 (en) |
-
1991
- 1991-07-04 JP JP03190757A patent/JP3077274B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH059669A (en) | 1993-01-19 |
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