JP2636585B2 - Sintered alloy valve sheet for internal combustion engine - Google Patents
Sintered alloy valve sheet for internal combustion engineInfo
- Publication number
- JP2636585B2 JP2636585B2 JP22225591A JP22225591A JP2636585B2 JP 2636585 B2 JP2636585 B2 JP 2636585B2 JP 22225591 A JP22225591 A JP 22225591A JP 22225591 A JP22225591 A JP 22225591A JP 2636585 B2 JP2636585 B2 JP 2636585B2
- Authority
- JP
- Japan
- Prior art keywords
- phase
- alloy
- sintered alloy
- internal combustion
- 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
Landscapes
- Powder Metallurgy (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、苛酷な条件下でもす
ぐれた耐摩耗性を有する内燃機関用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 sintered alloy valve seat having excellent wear resistance even under severe conditions.
【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として、数多くの焼結合金が適用さ
れている。2. Description of the Related Art Conventionally, many sintered alloys are generally used as valve seats 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
一層耐摩耗性のすぐれたバルブシートの開発が強く望ま
れているのが現状である。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. At present, it is strongly desired to develop a valve seat having even better wear resistance in order to cope with this.
【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、
重量％で（以下％は重量％を示す）、マイクロビッカー
ス硬さ（ＭＨｖ）で７００〜１８００を有するＦｅ−Ｃ
ｒ−Ｃｏ−Ｗ系合金相（以下第１相という）：３〜１５
％、ＭＨｖ：５００〜１０００を有するＣｏ−Ｍｏ−Ｃ
ｒ系合金相（以下第２相という）：２〜１２％、ＭＨ
ｖ：１００〜３００を有するＦｅ−Ｃｏ系合金相（以下
第３相という）：残り、からなる割合の３相混合組織を
有する、焼結ままの焼結合金、あるいはこれの鍛造材で
構成すると、この結果の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, and as a result,
Fe-C having a micro Vickers hardness (MHv) of 700 to 1800 by weight% (hereinafter% means weight%)
r-Co-W alloy phase (hereinafter referred to as first phase): 3 to 15
%, MHv: Co-Mo-C with 500-1000
r-based alloy phase (hereinafter referred to as second phase): 2 to 12%, MH
v: Fe-Co-based alloy phase having 100 to 300 (hereinafter referred to as a third phase): When composed of a sintered alloy as-sintered or a forged material of the same, having a three-phase mixed structure with the balance of The research results show that the resulting sintered alloy valve seat shows excellent wear resistance even in practical use under severe conditions.
【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、ＭＨｖ：７００〜１８００を有
するＦｅ−Ｃｒ−Ｃｏ−Ｗ系合金の第１相：３〜１５
％、ＭＨｖ：５００〜１０００を有するＣｏ−Ｍｏ−Ｃ
ｒ系合金の第２相：２〜１２％、ＭＨｖ：１００〜３０
０を有するＦｅ−Ｃｏ系合金の第３相：残り、からなる
割合の３相混合組織を有する、焼結ままの焼結合金、あ
るいはこれの鍛造材で構成してなる耐摩耗性のすぐれた
内燃機関用焼結合金製バルブシートに特徴を有するもの
である。[0005] The present invention has been made based on the above research results, and the first phase of the Fe-Cr-Co-W alloy having MHv: 700 to 1800: 3 to 15
%, MHv: Co-Mo-C with 500-1000
Second phase of r-based alloy: 2 to 12%, MHv: 100 to 30
Fe-Co-based alloy having 0: the third phase: a residual as-sintered sintered alloy having a three-phase mixed structure in the proportion of, or excellent wear resistance constituted by a forged material thereof It is characterized by a valve seat made of a sintered alloy for an internal combustion engine.
【０００６】なお、この発明のバルブシートにおいて、
これを構成する焼結合金の第１相のＦｅ−Ｃｒ−Ｃｏ−
Ｗ系合金は、 Ｃｏ：１０〜３０％、 Ｗ：５〜３０％、 Ｃｒ：２０〜４０％、 Ｎｂ：０．２〜２％、 Ｓｉ：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も
つのが望ましく、同じく第２相のＣｏ−Ｍｏ−Ｃｒ系合
金は、 Ｍｏ：２０〜４０％、 Ｃｒ：５〜１５％、 Ｓｉ：１〜５％、 を含有し、残りがＣｏと不可避不純物からなる組成、さ
らに第３相のＦｅ−Ｃｏ系合金は、 Ｃｏ：２〜１０％、 Ｍｏ：０．５〜３％、 Ｎｉ：０．５〜４％、 Ｃ：０．５〜１．５％、 を含有し、さらに必要に応じて、 Ｃｒ：０．５〜５％、 Ｎｂ：０．１〜２％、 のうちの１種または２種、を含有し、残りがＦｅと不可
避不純物からなる組成をそれぞれ有するのが望ましい。[0006] In the valve seat of the present invention,
Fe-Cr-Co- of the first phase of the sintered alloy constituting this
W-based alloys: Co: 10 to 30%, W: 5 to 30%, Cr: 20 to 40%, Nb: 0.2 to 2%, Si: 0.2 to 2%, C: 1 to 3% , And the balance is preferably composed of Fe and unavoidable impurities. Similarly, the second phase Co—Mo—Cr alloy is Mo: 20 to 40%, Cr: 5 to 15%, Si: , The balance being Co and unavoidable impurities, and the third phase Fe-Co-based alloy: Co: 2 to 10%, Mo: 0.5 to 3%, Ni: 0 0.5-4%, C: 0.5-1.5%, and if necessary, one of the following: Cr: 0.5-5%, Nb: 0.1-2% Alternatively, it is desirable to contain two types, and to have the composition of Fe and unavoidable impurities, respectively.
【０００７】また、この発明のブルブシートにおいて、
焼結合金を構成する第１〜３相の硬さおよび含有割合
は、いずれも多数の試験結果にもとづいて経験的に定め
られたものであり、したがって、それぞれの相の硬さお
よび含有量のいずれかでも上記の範囲から外れると、バ
ルブシートの全体的硬さバランスがくずれ、相対的に硬
さが低下したり、あるいは高くなったりして、所望の耐
摩耗性が得られない場合や、相手攻撃性が増したりする
場合が生じるようになるので、上記第１〜３相の硬さお
よび含有割合を上記範囲内に限定するこにより所望のす
ぐれた耐摩耗性と小さな相手攻撃性を確保するようにし
たものである。[0007] In the bulb sheet of the present invention,
The hardness and the content ratio of the first to third phases constituting the sintered alloy are all empirically determined based on a large number of test results, and accordingly, the hardness and the content of each phase are determined. If any of the above ranges are out of the above range, the overall hardness balance of the valve seat is lost, and the hardness is relatively reduced or increased, or the desired wear resistance is not obtained, In some cases, the aggressiveness of the opponent increases, so that the desired excellent wear resistance and small aggressiveness of the opponent are secured by limiting the hardness and the content ratio of the first to third phases within the above ranges. It is something to do.
【０００８】さらに、上記第１〜３相のそれぞれの硬さ
は、これを構成する合金組成を上記の通りに限定するこ
とにより得られ、かつ硬さの上記範囲内での変化は、合
金組成を調整することにより行なわれる。Further, the hardness of each of the first to third phases can be obtained by limiting the alloy composition of the first to third phases as described above. This is done by adjusting.
【０００９】[0009]
【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、表２、および表３に示される硬さおよび組成を有す
る粒度：１００mesh以下のアトマイズ粉末を用意し、こ
れら原料粉末を表４および表５に示される配合組成に配
合し、潤滑材としてステアリン酸亜鉛：１％を加えてミ
キサーにて３０分間混合した後、７ton ／cm2 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（上記ステアリン酸亜鉛の除去）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成分組成、同じく表４および
表５に示される理論密度比、並びに外径：３４mm×内
径：２７mm×厚さ：７mmの寸法をもった焼結体とし、こ
れらの焼結体の一部には、メタン変成ガス雰囲気中、１
０００℃に加熱した状態で、厚さ方向：２０％の鍛造加
工を施し、さらに６００〜７００℃の範囲内の所定温度
に１．５時間保持の条件で熱処理を施すことにより本発
明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）１〜１６、および比較焼結合金製バルブシート
（以下比較バルブシートという）１〜１０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 raw material powders, atomized powders having a hardness and a composition shown in Table 1, Table 2 and Table 3, respectively, having a particle size of 100 mesh or less were prepared, and these raw material powders were blended into the composition shown in Tables 4 and 5. Then, zinc stearate: 1% was added as a lubricant, and the mixture was mixed by a mixer for 30 minutes, and then pressed into a green compact at a pressure of 7 ton / cm 2 , and the green compact was held at 500 ° C. for 30 minutes. Degreased (removal of the above zinc stearate), and then in an ammonia decomposition gas atmosphere,
Sintering for 1 hour at a predetermined temperature in the range of ℃,
A sintered body having substantially the same composition as the composition, the theoretical density ratio also shown in Tables 4 and 5, and the dimensions of outer diameter: 34 mm × inner diameter: 27 mm × thickness: 7 mm was obtained. In a part of the sintered body,
In the state of being heated to 000 ° C, the sintered alloy of the present invention is subjected to a forging process in the thickness direction: 20% and further to a heat treatment at a predetermined temperature in the range of 600 to 700 ° C for 1.5 hours. Valve seats (hereinafter referred to as the present invention valve seats) 1 to 16 and comparative sintered alloy valve seats (hereinafter referred to as comparative valve seats) 1 to 10 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】なお、比較バルブシート１〜１０は、これ
を構成する焼結合金の第１〜３相の硬さおよび含有割合
のうちのいずれかがこの発明の範囲から外れたものであ
る。The comparative valve seats 1 to 10 have any one of the hardness and content ratio of the first to third phases of the sintered alloy constituting the comparative valve seats out of the scope of the present invention.
【００１６】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・ＳＵＨ３６、 バルブの加熱温度：８５０〜９００℃、 バルブの着座回数：３０００ｒ．ｐ．ｍ．、 雰囲気：０．４kg／cm2 の圧力のプロパンガスと、流
量：１．６ｌ／min 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）：３５０〜４
００℃ 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４および表５に示した。Next, regarding the various valve seats obtained as a result, the material of the valve: JIS SUH36, the heating temperature of the valve: 850 to 900 ° C., the number of seating times of the valve: 3000 r. p. m. Atmosphere: Propane gas at a pressure of 0.4 kg / cm 2 , combustion gas with oxygen at a flow rate of 1.6 l / min, Surface heating temperature of valve seat (internal water cooling): 350 to 4
A wear test was performed under the following conditions: 00 ° 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. Tables 4 and 5 show the measurement results.
【００１７】[0017]
【発明の効果】表４および表５に示される結果から、本
発明バルブシート１〜１６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
ルブシートに見られるように、焼結合金を構成する第１
〜３相の硬さおよび含有割合のうちのいずれかでもこの
発明の範囲から外れると、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ることが明
らかである。From the results shown in Tables 4 and 5, all of the valve seats 1 to 16 of the present invention show excellent abrasion resistance and low aggressiveness on the other side, whereas the valve seats of the present invention show comparative valve seats. As can be seen, the first component of the sintered alloy
It is clear that, if any of the hardness and the content ratio of the three phases is out of the range of the present invention, at least one of the abrasion resistance and the aggressiveness to the partner becomes inferior.
【００１８】上述のように、この発明の焼結合金製バル
ブシートは、すぐれた耐摩耗性を有するので、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, since the sintered alloy valve seat of the present invention has excellent wear resistance, it exhibits excellent performance for a long period of time even in practical use under severe conditions.
Claims (2)
００〜１８００を有するＦｅ−Ｃｒ−Ｃｏ−Ｗ系合金の
第１相：３〜１５％、 ＭＨｖ：５００〜１０００を有するＣｏ−Ｍｏ−Ｃｒ系
合金の第２相：２〜１２％、 ＭＨｖ：１００〜３００を有するＦｅ−Ｃｏ系合金の第
３相：残り、からなる割合（以上重量％）の３相混合組
織を有する焼結ままの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焼結合金製バルブシ
ート。1. Micro Vickers hardness (MHv): 7
First phase of Fe-Cr-Co-W-based alloy having 00 to 1800: 3 to 15%, MHv: second phase of Co-Mo-Cr-based alloy having 500 to 1000: 2 to 12%, MHv: A third phase of an Fe—Co alloy having 100 to 300: abrasion resistance characterized by being composed of an as-sintered sintered alloy having a three-phase mixed structure in a proportion (more than weight%) of the remainder Excellent sintered alloy valve seat for internal combustion engines.
００〜１８００を有するＦｅ−Ｃｒ−Ｃｏ−Ｗ系合金の
第１相：３〜１５％、 ＭＨｖ：５００〜１０００を有するＣｏ−Ｍｏ−Ｃｒ系
合金の第２相：２〜１２％、 ＭＨｖ：１００〜３００を有するＦｅ−Ｃｏ系合金の第
３相：残り、からなる割合（以上重量％）の３相混合組
織を有する焼結合金の鍛造材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焼結合金製バルブシー
ト。2. Micro Vickers hardness (MHv): 7
First phase of Fe-Cr-Co-W-based alloy having 00 to 1800: 3 to 15%, MHv: second phase of Co-Mo-Cr-based alloy having 500 to 1000: 2 to 12%, MHv: 3rd phase of Fe-Co alloy having 100 to 300: abrasion resistance characterized by being composed of a forged material of a sintered alloy having a three-phase mixed structure in a proportion (more than weight%) consisting of the remainder. Excellent sintered alloy valve seat for internal combustion engines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22225591A JP2636585B2 (en) | 1991-08-07 | 1991-08-07 | Sintered alloy valve sheet for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22225591A JP2636585B2 (en) | 1991-08-07 | 1991-08-07 | Sintered alloy valve sheet for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0543912A JPH0543912A (en) | 1993-02-23 |
| JP2636585B2 true JP2636585B2 (en) | 1997-07-30 |
Family
ID=16779530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22225591A Expired - Lifetime JP2636585B2 (en) | 1991-08-07 | 1991-08-07 | Sintered alloy valve sheet for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2636585B2 (en) |
-
1991
- 1991-08-07 JP JP22225591A patent/JP2636585B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0543912A (en) | 1993-02-23 |
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