JPH06158117A - Two-layered valve seat made of iron-containing sintered alloy for internal-combustion engine - Google Patents
Two-layered valve seat made of iron-containing sintered alloy for internal-combustion engineInfo
- Publication number
- JPH06158117A JPH06158117A JP33011592A JP33011592A JPH06158117A JP H06158117 A JPH06158117 A JP H06158117A JP 33011592 A JP33011592 A JP 33011592A JP 33011592 A JP33011592 A JP 33011592A JP H06158117 A JPH06158117 A JP H06158117A
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- layer
- sintered alloy
- mhv
- dispersed phase
- 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.)
- Pending
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Powder Metallurgy (AREA)
Abstract
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、かつ相手攻撃性も低
い内燃機関用鉄系焼結合金製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 ferrous sintered alloy for an internal combustion engine, which exhibits excellent wear resistance even when used under severe conditions and has low opponent attack. is there.
【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, various internal combustion engines have been remarkably improved in performance and speed, and along with this, the operating environment of the valve seat, which is a structural member thereof, has become more severe. In order to cope with this, there is a strong demand for the development of a valve seat having even 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、
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層構造を有
する鉄系焼結合金で構成すると共に、上記バルブ当接層
を、マイクロビッカース硬さ（ＭＨｖ）：７００〜１８
００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：２〜１
２％、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
で構成すると、この結果の鉄系焼結合金製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、相手攻撃性も低いという研究結果
を得たのである。Therefore, the present inventors have
From the above viewpoints, as a result of research to develop a valve seat with excellent wear resistance,
The valve contact layer is made of an iron-based sintered alloy having a two-layer structure of an Fe-based sintered alloy valve contact layer and an Fe-based sintered alloy backup layer integrally sintered and bonded to the valve contact layer. , Micro Vickers hardness (MHv): 700-18
Fe-Cr-W-Co based alloy having 00: 1 to 15%, 3 to 15%, MHv: 400 to 800, Fe
Second dispersed phase of -Cr-Mo-W-V alloy: 5 to 30
%, And, if necessary, MHv: 500 to 1000
Third dispersed phase of Co-Cr-Mo based alloy having: 2-1
2%, Fe-Co based alloy having MHv: 100 to 400: base, the remainder consisting of a Fe-based sintered alloy having a composition (above wt%), and the backup layer
When the Fe-Cr sintered alloy having MHv: 100 to 300 is used, the resulting iron-based sintered alloy two-layer valve seat exhibits excellent wear resistance during practical use under severe conditions. , The research result that the opponent aggressiveness is also low was obtained.
【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層構造を有する鉄系焼結合金からなると共
に、上記バルブ当接層を、マイクロビッカース硬さ（Ｍ
Ｈｖ）：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-mentioned research results, and comprises a valve contact layer of an Fe-based sintered alloy and a backup layer of an Fe-based sintered alloy integrally sinter-bonded with the valve contact layer. The valve contact layer is made of an iron-based sintered alloy having a two-layer structure and has a micro Vickers hardness (M
Hv): Fe-Cr-WC with 700-1800
First dispersed phase of o-based alloy: 3 to 15%, MHv: 400 to
Second Fe-Cr-Mo-WV based alloy having 800
Dispersed phase: 5-30%, and, if necessary, MHv:
Fe-based sintered alloy having a composition of the third dispersed phase of Co-Cr-Mo alloy having 500 to 1000: 2 to 12%, the base of Fe-Co alloy having MHv: 100 to 400: the rest. And an iron-based sintered alloy for an internal combustion engine, which is excellent in wear resistance and has a low opponent attack, which is composed of a Fe—Cr-based sintered alloy having MHv: 100 to 300. It is characterized by a two-layer valve seat manufactured.
【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。In the two-layer valve seat of the present invention, the first Fe-based sintered alloy forming 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
.About.2%, C: 1 to 3%, and a balance of Fe and unavoidable impurities in the composition Fe--Cr--W--Co alloy, and the second dispersed phase is C: 0.7-2. %, 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%, and the balance is Fe-Cr-Mo-WV-based alloy having a composition of Fe and inevitable impurities, and is also contained as necessary as a dispersed phase in the matrix. The third dispersed phase is Cr: 25 to 32%, M
o: 7-10%, Si: 1.5-3.5%,
The rest is a Co-Cr-Mo based alloy consisting of Co and unavoidable impurities, and the base is Ni: 0.5-4%, C:
0.5-1.5%, Mo: 0.5-3%, Co: 2
10% to 10%, and if necessary, Cr: 0.
5-5%, Nb: 0.1-2%, Mn: 0.1-1
%, One or two or more of
It is desirable to use an Fe-Co alloy having a composition consisting of e and inevitable impurities, and further, F of the backup layer.
The e-Cr system sintered alloy has C: 0.3 to 1.2% and Cr:
It is desirable to have a composition containing 1.2 to 3.5%, Mo: 0.1 to 1%, and the balance being Fe and inevitable 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
分散相のそれを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−Ｃｒ系焼
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 which constitutes the two-layer valve seat of the present invention, and also the backup layer, respectively have the above-mentioned characteristics. Fe-Cr-W-
Co-based alloy, Fe-Cr-Mo-W-V-based alloy, Co-
Cr-Mo based alloy, Fe-Co based alloy, and F
By being made of an e-Cr system sintered alloy, it has the above hardness, and in the valve contact layer, the content ratios of the first and second dispersed phases are 3 to 15% and 5 respectively. 30% and third included if necessary
By setting the content of the dispersed phase to 2 to 12%, an effective hardness balance is formed between these and the base material to ensure excellent wear resistance and low opponent attack, and the backup layer In the above, the Fe—Cr based sintered alloy having the above composition ensures a desired strength and a thermal expansion coefficient similar to that of the valve contact layer.
【０００８】[0008]
【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
Ｃｏ−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１
００mesh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、
Ｆｅ−１３％Ｃｒ−５％Ｎｂ合金粉末、Ｆｅ−７５％Ｍ
ｎ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、６ton ／cm2 の
圧力で圧粉体にプレス成形し、この圧粉体を５００℃に
３０分間保持条件で脱脂した後、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することにより配合組成と実質的
に同一の組成、表７，８に示されるバルブ当接層および
バックアップ層の硬さ、理論密度比並びに外径：４８mm
×内径：４０mm×厚さ：８mmの寸法をもった本発明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。EXAMPLES Next, the two-layer valve seat of the present invention will be specifically described by way of examples. As a raw material powder, a particle size for forming the first dispersed phase, the second dispersed phase, and the third dispersed phase of the valve contact layer having the hardness and the composition shown in Tables 1 to 4 respectively: Fe-of 80 mesh or less Cr-W-Co based alloy powder, Fe-Cr-Mo-W-V based alloy powder, Co-Cr-Mo based alloy powder, and the same for forming the valve contact layer base and backup layer.
Fe powder having a grain size of 00 mesh or less, Fe-1% Cr
-0.3% Mn alloy powder, Fe-13% Cr alloy powder,
Fe-13% Cr-5% Nb alloy powder, Fe-75% M
n powder, Fe-60% Nb powder Co powder, Ni powder, M
o Powder and graphite powder are prepared, and these raw material powders are blended in the blending compositions shown in Tables 5 to 7, respectively, and 1% of stearic acid is added and mixed in a mixer to form a valve contact layer and a backup layer. In the mold with a combination shown in Tables 8 to 10 and a relative ratio of both layers is a valve contact layer / backup layer = 4/6 in a weight ratio. And press-molding it into a green compact at a pressure of 6 ton / cm 2 and degreasing the green compact at a holding condition of 500 ° C. for 30 minutes, and then in an ammonia decomposition gas atmosphere within a range of 1100 to 1200 ° C. 1 at the specified temperature
By sintering under the condition of holding time, the composition is substantially the same as the composition, hardness of valve contact layer and backup layer shown in Tables 7 and 8, theoretical density ratio and outer diameter: 48 mm
× Inner diameter: 40 mm × Thickness: Inventive two-layer valve seats 1 to 18 and comparative two-layer valve seats 1 to 8 having dimensions of 8 mm
12 were produced respectively.
【０００９】なお、比較２層バルブシート１〜１２は、
これを構成するバルブ当接層の第１、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、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＊印を付す）がこの発明の範囲から外れたもので
ある。The comparative two-layer valve seats 1 to 12 are
At least one of the hardnesses of the first and second dispersed phases and the base material of the valve abutting layer and the base material and the backup layer, and the content ratios of the first and second dispersed phases (marked with * in the table) Is attached) is outside the scope of the present invention.
【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】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 resulting two-layer valve seat, valve material: SUH36, valve heating temperature: 800 ° C, valve seating frequency: 3000 times / min, atmosphere: pressure of 0.4 kg / cm 2 . Propane gas of 1.
A wear test was performed under the following conditions: combustion gas with oxygen at a flow rate of 6 l / min, surface heating temperature of valve seat (internal water cooling): 350 ° C, test time: 50 hours, maximum wear depth of valve seat and mating member The maximum wear depth of a valve was measured. The results of these measurements are shown in Tables 8-10.
【００２１】[0021]
【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, the two-layer valve seats 1 to 18 of the present invention all show excellent wear resistance and their opponent attacking property is small.
If any one of the conditions constituting the two-layer valve seat as seen in the one-layer valve seats 1 to 12 is out of the scope of the invention, the valve contact layer has at least one of wear resistance and opponent attack property. Either of them will be inferior, and in the backup layer, the shrinkage ratio at the time of sintering relative to the valve contact layer will be relatively large and the valve seat will be deformed, or the material strength of itself will decrease. Is clear. As described above, the two-layer valve seat of the present invention exhibits excellent wear resistance for an extremely long period of time even when it is put to practical use under severe conditions, while suppressing the wear of the mating member.
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層構造を有する鉄系焼結合金からなると共に、 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％、 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鉄系焼結合金製２層バ
ルブシート。1. An iron-based sintered alloy having a two-layer structure of a valve contact layer made of an Fe-based sintered alloy and a backup layer made of an Fe-based sintered alloy integrally sinter-bonded thereto. The contact layer has a micro Vickers hardness (MHv): 700 to 1800
First dispersed phase of Fe-Cr-W-Co based alloy having: 3
~ 15%, Fe-Cr-Mo-W with MHv: 400-800
-V-based alloy second dispersed phase: 5 to 30%, MHv: 100 to 400 Fe-Co based alloy base: remainder, Fe-based sintered alloy having a composition (above wt%) A two-layer valve seat made of an iron-based sintered alloy for internal combustion engines having excellent wear resistance, characterized in that the backup layer is made of a Fe-Cr-based sintered alloy having MHv: 100 to 300.
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層構造を有する鉄系焼結合金からなると共に、 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％、 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鉄系焼結合金製２層バ
ルブシート。2. An iron-based sintered alloy having a two-layer structure of a Fe-based sintered alloy valve abutting layer and an Fe-based sintered alloy backup layer integrally sintered and bonded to the valve-abutted layer. The contact layer has a micro Vickers hardness (MHv): 700 to 1800
First dispersed phase of Fe-Cr-W-Co based alloy having: 3
~ 15%, Fe-Cr-Mo-W with MHv: 400-800
-V-based alloy second dispersed phase: 5-30%, MHv: 500-1000 Co-Cr-Mo-based alloy third dispersed phase: 2-12%, MHv: 100-400 Fe-Co Base alloy base: The remainder is composed of a Fe-based sintered alloy having a composition (at least by weight), and the backup layer is composed of a Fe-Cr sintered alloy having MHv: 100 to 300. A two-layer valve seat made of iron-based sintered alloy with excellent wear resistance for internal combustion engines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33011592A JPH06158117A (en) | 1992-11-16 | 1992-11-16 | Two-layered valve seat made of iron-containing sintered alloy for internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33011592A JPH06158117A (en) | 1992-11-16 | 1992-11-16 | Two-layered valve seat made of iron-containing sintered alloy for internal-combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06158117A true JPH06158117A (en) | 1994-06-07 |
Family
ID=18228970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33011592A Pending JPH06158117A (en) | 1992-11-16 | 1992-11-16 | Two-layered valve seat made of iron-containing sintered alloy for internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06158117A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109988971A (en) * | 2019-04-16 | 2019-07-09 | 东北大学 | A method of producing special ultra-pure high-speed tool steel |
-
1992
- 1992-11-16 JP JP33011592A patent/JPH06158117A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109988971A (en) * | 2019-04-16 | 2019-07-09 | 东北大学 | A method of producing special ultra-pure high-speed tool steel |
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