JP2005120416A - VALVE SEAT MADE OF Fe-Al-C SINTERED ALLOY HAVING SUPERIOR HIGH-TEMPERATURE OXIDATION RESISTANCE AND HIGH STRENGTH - Google Patents
VALVE SEAT MADE OF Fe-Al-C SINTERED ALLOY HAVING SUPERIOR HIGH-TEMPERATURE OXIDATION RESISTANCE AND HIGH STRENGTH Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
Abstract
Description
この発明は、すぐれた高温耐酸化性と高強度を有し、特に低排ガス自動車であるＬＰガス自動車のエンジンに組み込まれた場合に、すぐれた耐摩耗性を長期に亘って発揮するＦｅ−Ａｌ−Ｃ焼結合金製バルブシートに関するものである。 The present invention has excellent high-temperature oxidation resistance and high strength, and Fe-Al that exhibits excellent wear resistance over a long period of time, particularly when incorporated in an engine of an LP gas vehicle, which is a low-emission vehicle. This relates to a valve seat made of -C sintered alloy.
従来、各種自動車エンジンのバルブシートとして多くのＦｅ系焼結合金製のものが提案され、中でも質量％（以下、％は質量％を示す）で、
Ａｌ：５〜３０％、
Ｃ ：０．２〜３％、
を含有し、残りがＦｅと不可避不純物からなる組成、およびＦｅ−Ａｌ合金相とＦｅ−Ｃ相の２相混在組織、またはＦｅ−Ａｌ合金相とＦｅ−Ｃ相と炭素（Ｃ）相の３相混在組織を有するＦｅ−Ａｌ−Ｃ焼結合金製バルブシートが注目されている。
Conventionally, many valve seats made of Fe-based sintered alloys have been proposed as valve seats for various automobile engines, and in particular, mass% (hereinafter,% indicates mass%),
Al: 5-30%
C: 0.2-3%,
And the remainder composed of Fe and inevitable impurities, and a two-phase mixed structure of Fe—Al alloy phase and Fe—C phase, or 3 of Fe—Al alloy phase, Fe—C phase and carbon (C) phase. A valve seat made of a Fe—Al—C sintered alloy having a phase mixed structure has attracted attention.
また、上記の従来Ｆｅ−Ａｌ−Ｃ焼結合金製バルブシートは、通常の条件、すなわちアンモニア分解ガスやＲＸ分解ガスなどの雰囲気中、１０５０〜１１５０℃の温度に０．５〜２時間保持の条件で焼結しても、原料粉末として用いられるＦｅ粉末、Ａｌ粉末、および炭素粉末の粉末相互の焼結性が悪いために所定の強度をもった焼結体を製造することができず、このため前記原料粉末を所定の配合組成に配合し、混合し、プレス成形してなる圧粉体に５〜１００Ａ／ｍｍ２の電流密度で通電プレス成形焼結（プレス圧力は通常１００ＭＰａ）を施すことにより製造されている。
近年、自動車の高速化および高出力化、さらに軽量化および小型化はめざましく、一方低公害化の面から環境にやさしい低排ガス自動車としてＬＰガス自動車が注目され、このため前記ＬＰガス自動車のエンジンからの排ガスは一段と高温化の傾向にあり、したがって、前記エンジンの構造部材であるバルブシートは、同対部材であるバルブからの面圧が一層強力になるばかりでなく、８００〜９００℃にも達する高温排ガスに曝される一方で、薄肉化および小径化も避けられないのが現状である。 In recent years, high speed and high output of automobiles, and further reduction in weight and size have been remarkable. On the other hand, LP gas automobiles have been attracting attention as environmentally friendly low emission vehicles from the viewpoint of low pollution. The exhaust gas of the engine has a tendency to further increase in temperature. Therefore, the valve seat which is a structural member of the engine not only has a stronger surface pressure from the valve which is a counter member but also reaches 800 to 900 ° C. While being exposed to high-temperature exhaust gas, thinning and diameter reduction are inevitable at present.
しかし、上記の従来Ｆｅ−Ａｌ−Ｃ焼結合金製バルブシートにおいては、上記の通り２相混在組織および３相混在組織をもち、かつ前記構成相のうちのＦｅ−Ｃ相が高温耐酸化性の劣るものであるため、特にＬＰガス自動車のエンジンに組み込まれた場合、前記高温の低排ガスによって前記Ｆｅ−Ｃ相の酸化が相対的に速く進行し、これが原因で摩耗が加速されるようになり、さらに前記２相混在組織および３相混在組織の場合、相境界部の強度が焼結性不足が原因で低いために薄肉化および小径化に十分な強度を確保することができない。 However, the above-mentioned conventional Fe-Al-C sintered alloy valve seat has a two-phase mixed structure and a three-phase mixed structure as described above, and the Fe-C phase of the constituent phases has high-temperature oxidation resistance. Therefore, especially when incorporated in an engine of an LP gas vehicle, the oxidation of the Fe-C phase proceeds relatively quickly by the high temperature low exhaust gas, and this accelerates wear. Furthermore, in the case of the two-phase mixed structure and the three-phase mixed structure, the strength of the phase boundary portion is low due to insufficient sinterability, so that sufficient strength for thinning and diameter reduction cannot be ensured.
そこで、本発明者等は、上述のような観点から、特に上記の従来Ｆｅ−Ａｌ−Ｃ焼結合金製バルブシートに着目し、これの高温耐酸化性と強度の向上を図るべく、研究を行った結果、Ｆｅ−Ａｌ−Ｃ焼結合金製バルブシートを製造するに際して、上記の通り原料粉末としてＦｅ粉末、Ａｌ粉末、および炭素（Ｃ）粉末を用いて、通常の焼結条件、すなわちアンモニア分解ガスやＲＸ分解ガスなどの雰囲気中、１０５０〜１１５０℃の温度に０．５〜２時間保持の焼結条件で製造した場合、上記の通電プレス成形焼結で製造された従来Ｆｅ−Ａｌ−Ｃ焼結合金製バルブシートと同様に、２相混在組織および３相混在組織をもつものとなり、しかもこれら構成相相互間の焼結性（密着性）は一段と劣るものとなるため、前記従来Ｆｅ−Ａｌ−Ｃ焼結合金製バルブシートに比して、さらに強度の低いものしか製造することができず、かつＦｅ−Ｃ相に加えて、相境界部の高温耐酸化性も低いものとなるが、原料粉末として、Ｆｅ粉末、Ｆｅ−Ａｌ合金粉末、望ましくはＦｅ−５０％Ａｌ合金粉末、および炭素（Ｃ）粉末を用い、これら原料粉末を特定の配合組成、すなわち、
Ａｌ：２０〜３０％、
Ｃ ：０．５〜１．５％、
Ｆｅ：残り、
の配合組成に配合し、通常の条件で混合し、プレス成形してなる圧粉体を、真空、望ましくは１０Ｐａ以下の真空中、上記の通常の焼結温度に比して相対的に高い１２００〜１３００℃の温度に１〜３時間保持の条件で焼結すると、製造されたバルブシートは、焼結時にＦｅ中にＦｅ−Ａｌ合金と炭素（Ｃ）が完全に固溶して、Ｆｅ−Ａｌ−Ｃ固溶体単相組織をもつようになり、この結果のＦｅ−Ａｌ−Ｃ焼結合金製バルブシートは、前記Ｆｅ−Ａｌ−Ｃ固溶体単相組織によって高温耐酸化性および強度が一段と向上したものになる、という研究結果を得たのである。
In view of the above, the present inventors have focused on the above-described conventional Fe-Al-C sintered alloy valve seat, and conducted research in order to improve its high-temperature oxidation resistance and strength. As a result, when manufacturing a valve seat made of an Fe—Al—C sintered alloy, as described above, using Fe powder, Al powder, and carbon (C) powder as raw material powder, normal sintering conditions, that is, ammonia When manufactured under the sintering conditions of holding at 0.550 to 2 hours at a temperature of 1050 to 1150 ° C. in an atmosphere such as cracked gas or RX cracked gas, the conventional Fe-Al- Like the valve seat made of C sintered alloy, it has a two-phase mixed structure and a three-phase mixed structure, and the sinterability (adhesion) between these constituent phases is further inferior. -Al-C firing Compared to alloy valve seats, only those with lower strength can be produced, and in addition to the Fe-C phase, the high-temperature oxidation resistance of the phase boundary is also low, Fe powder, Fe-Al alloy powder, desirably Fe-50% Al alloy powder, and carbon (C) powder are used, and these raw material powders have a specific composition, that is,
Al: 20-30%,
C: 0.5 to 1.5%
Fe: the rest
The green compact formed by mixing, press-molding, and mixing in the above composition, in a vacuum, desirably 10 Pa or less, is relatively higher than the above normal sintering temperature 1200. When sintered at a temperature of ˜1300 ° C. under the condition of holding for 1 to 3 hours, the manufactured valve seat is obtained by completely dissolving Fe—Al alloy and carbon (C) in Fe during sintering. The resulting Fe-Al-C sintered alloy valve seat has an Al-C solid solution single phase structure, and the Fe-Al-C solid solution single phase structure has further improved high-temperature oxidation resistance and strength. The research result that it becomes a thing was obtained.
この発明は、上記の研究結果に基づいてなされたものであって、
Ａｌ：２０〜３０％、
Ｃ ：０．５〜１．５％、
を含有し、残りがＦｅと不可避不純物からなる組成、並びにＦｅ−Ａｌ−Ｃ固溶体単相組織を有するＦｅ−Ａｌ−Ｃ焼結合金で構成してなる、すぐれた高温耐酸化性と高強度を有するＦｅ−Ａｌ−Ｃ焼結合金製バルブシートに特徴を有するものである。
This invention was made based on the above research results,
Al: 20-30%,
C: 0.5 to 1.5%
With the composition comprising Fe and inevitable impurities as well as the Fe-Al-C sintered alloy having a single-phase structure of Fe-Al-C solid solution, excellent high temperature oxidation resistance and high strength It has the characteristics in the valve seat made from an Fe-Al-C sintered alloy.
つぎに、この発明のバルブシートを構成するＦｅ−Ａｌ−Ｃ焼結合金の組成を上記の通りに限定した理由を説明する。
（ａ）Ａｌ
上記の通り、この発明のバルブシートを構成するＦｅ−Ａｌ−Ｃ焼結合金のＦｅ−Ａｌ−Ｃ固溶体単相組織は、原料粉末として、Ｆｅ粉末、Ｆｅ−Ａｌ合金粉末、および炭素（Ｃ）粉末を用い、ＡｌとＣの含有割合を上記の通りに限定し、かつ高温真空焼結することによって形成することができ、しかも相境界部が存在しないので一段と高い強度をもつものとなるばかりでなく、前記Ｆｅ−Ａｌ−Ｃ固溶体自体も構成成分であるＦｅ成分で強度、Ａｌ成分で高温耐酸化性、そしてＣ成分の作用で硬さを具備したものとなる。しかし、Ａｌ成分の含有割合が２０％未満では所望のすぐれた高温耐酸化性を確保することができず、一方その含有割合が３０％を越えると、原料粉末としてのＦｅ−Ａｌ合金粉末の配合割合が多くなり過ぎて、焼結時のＦｅへの完全固溶が困難となり、強度および高温耐酸化性低下の原因となる２相混在組織および３相混在組織が出現するようになることから、Ａｌ成分の含有割合を２０〜３０％と定めた。
（ｂ）Ｃ
Ｃ成分には、Ｆｅ−Ａｌ−Ｃ固溶体にあって、これの硬さを向上させ、もってバルブシートの耐摩耗性を向上させる作用があるが、その含有割合が０．５％未満では所望の硬さ向上効果が得られず、一方その含有割合が１．５％を越えると、Ａｌの場合と同様に焼結時のＦｅへの完全固溶が困難となり、２相混在組織および３相混在組織となって、強度および高温耐酸化性が急激に低下するようになることから、Ｃ成分の含有割合を０．５〜１．５％と定めた。
Next, the reason why the composition of the Fe—Al—C sintered alloy constituting the valve seat of the present invention is limited as described above will be described.
(A) Al
As described above, the Fe—Al—C solid solution single-phase structure of the Fe—Al—C sintered alloy constituting the valve seat of the present invention includes Fe powder, Fe—Al alloy powder, and carbon (C) as raw material powder. It can be formed by using powder, limiting the content ratio of Al and C as described above, and performing high-temperature vacuum sintering, and since it does not have a phase boundary, it has a much higher strength. In addition, the Fe—Al—C solid solution itself has strength as the constituent Fe component, high temperature oxidation resistance as the Al component, and hardness due to the action of the C component. However, if the content ratio of the Al component is less than 20%, the desired excellent high-temperature oxidation resistance cannot be ensured. On the other hand, if the content ratio exceeds 30%, the blending of the Fe—Al alloy powder as the raw material powder is not possible. Since the ratio becomes too large, it becomes difficult to completely dissolve in Fe during sintering, and a two-phase mixed structure and a three-phase mixed structure that cause a decrease in strength and high-temperature oxidation resistance will appear. The content ratio of the Al component was set to 20 to 30%.
(B) C
The C component is in a Fe-Al-C solid solution, and has the effect of improving the hardness thereof, thereby improving the wear resistance of the valve seat. However, if the content ratio is less than 0.5%, it is desirable. If the hardness improvement effect is not obtained, but the content ratio exceeds 1.5%, it is difficult to completely dissolve in Fe during sintering, as in the case of Al, and a two-phase mixed structure and a three-phase mixed Since the strength and high-temperature oxidation resistance suddenly declined in the structure, the content ratio of the C component was determined to be 0.5 to 1.5%.
この発明のＦｅ−Ａｌ−Ｃ焼結合金製バルブシートは、Ｆｅ−Ａｌ−Ｃ固溶体単相組織を有するＦｅ−Ａｌ−Ｃ焼結合金で構成され、前記Ｆｅ−Ａｌ−Ｃ固溶体単相組織はすぐれた高温耐酸化性と高強度を有するので、特に低排ガス自動車であるＬＰガス自動車のエンジンに組み込まれた場合に、自動車の高速化および高出力化に伴ない、排ガスが８００〜９００℃の高温に達するにもかかわらず、すぐれた耐摩耗性を長期に亘って発揮し、かつ薄肉化および小径化を可能とするものである。 The valve seat made of an Fe—Al—C sintered alloy of the present invention is composed of an Fe—Al—C sintered alloy having an Fe—Al—C solid solution single phase structure, and the Fe—Al—C solid solution single phase structure is As it has excellent high-temperature oxidation resistance and high strength, it has an exhaust gas of 800-900 ° C., especially when it is incorporated in the engine of an LP gas vehicle, which is a low exhaust gas vehicle, as the speed of the vehicle increases and the output increases. In spite of reaching a high temperature, it exhibits excellent wear resistance over a long period of time, and enables a reduction in thickness and diameter.
つぎに、この発明のＦｅ−Ａｌ−Ｃ焼結合金製バルブシートを実施例により具体的に説明する。 Next, the Fe-Al-C sintered alloy valve seat of the present invention will be described in detail by way of examples.
原料粉末として、篩目が０．２ｍｍの篩下の粒度を有するＦｅ粉末およびＦｅ−５０％Ａｌ合金粉末、および平均粒径：１０μｍの炭素（Ｃ）粉末を用い、これら原料粉末を表１に示される配合組成に配合し、結合材として前記配合粉末に対する割合で０．８％のステアリン酸亜鉛を加えてミキサーにて３０分間混合し、０．７Ｐａの圧力で、外径：４３ｍｍ×内径：３１ｍｍ×高さ：６．５ｍｍの寸法をもったリング状成形体にプレス成形し、この成形体を、３Ｐａの真空中、４００℃に２０分間保持の条件で加熱して前記結合材を除去した後、同じく３Ｐａの真空中、通常の焼結温度に比して相対的に高い１２５０℃に１．５時間保持の条件で真空高温焼結し、この結果の焼結体を外径：４０ｍｍ×内径：３４ｍｍ×高さ：６ｍｍの寸法に機械加工し、当接面加工も施すことにより本発明Ｆｅ−Ａｌ−Ｃ焼結合金製バルブシート（以下、本発明焼結バルブシートという）１〜７をそれぞれ製造した。 As the raw material powder, Fe powder having a sieve size of 0.2 mm and Fe-50% Al alloy powder, and carbon (C) powder having an average particle size of 10 μm were used. It mix | blends with the mixing | blending composition shown, and 0.8% of zinc stearate is added as a binder to the said mixing | blending powder, and it mixes for 30 minutes with a mixer, and the outer diameter: 43 mm x inner diameter: The molded product was press-molded into a ring-shaped molded product having dimensions of 31 mm × height: 6.5 mm, and the molded product was heated at 400 ° C. for 20 minutes in a 3 Pa vacuum to remove the binder. Thereafter, in the same 3 Pa vacuum, high temperature vacuum sintering was performed at 1250 ° C., which is relatively higher than the normal sintering temperature, for 1.5 hours, and the resulting sintered body was outer diameter: 40 mm × Inner diameter: 34 mm x height: 6 mm The valve seats made of the present invention Fe-Al-C sintered alloy (hereinafter referred to as the present invention sintered valve seats) 1 to 7 were produced by machining and contact surface processing, respectively.
また、比較の目的で、原料粉末として、平均粒径：５μｍのＦｅ粉末、同２０μｍのＡｌ粉末、および平均粒径：１０μｍの炭素（Ｃ）粉末を用い、これら原料粉末を表１に示される配合組成に配合し、結合材として前記配合粉末に対する割合で０．８％のステアリン酸亜鉛を加えてミキサーにて３０分間混合し、０．７Ｐａの圧力で、外径：４３ｍｍ×内径：３１ｍｍ×高さ：６．５ｍｍの寸法をもったリング状成形体にプレス成形し、この成形体を、同じ条件で脱バインダー処理した後、１００ＭＰａの圧力を加えながら２５Ａ／ｍｍ２の電流密度で３秒間保持の条件で通電プレス成形焼結し、この結果の焼結体を外径：４０ｍｍ×内径：３４ｍｍ×高さ：６ｍｍの寸法に機械加工し、当接面加工も施すことにより従来Ｆｅ−Ａｌ−Ｃ焼結合金製バルブシート（以下、従来焼結バルブシートという）１〜７をそれぞれ製造した。 For comparison purposes, as raw material powder, Fe powder having an average particle size of 5 μm, Al powder of 20 μm, and carbon (C) powder having an average particle size of 10 μm were used, and these raw material powders are shown in Table 1. It mix | blends with a mixing | blending composition, 0.8% of zinc stearate is added as a binder with the ratio with respect to the said mixing | blending powder, It mixes for 30 minutes with a mixer, Outer diameter: 43 mm x Inner diameter: 31 mm x with the pressure of 0.7 Pa Height: Press-molded into a ring-shaped molded product having a dimension of 6.5 mm, and after this binder was debindered under the same conditions, the pressure was applied at 100 MPa, and the current density was 25 A / mm 2 for 3 seconds. The conventional Fe-Al is obtained by subjecting the resulting sintered compact to the outer diameter: 40 mm x inner diameter: 34 mm x height: 6 mm and machining the contact surface. -C burned bond Ltd. valve seat (hereinafter, conventional sintering of sintered valve seat) was 1-7 were prepared, respectively.
この結果得られた本発明焼結バルブシート１〜７および従来焼結バルブシート１〜７について、その組織を金属顕微鏡を用いて観察したところ、表１に示される通り、本発明焼結バルブシート１〜７はいずれもＦｅ−Ａｌ−Ｃ固溶体単相組織を示し、従来焼結バルブシート１〜７は、いずれもＦｅ−Ａｌ合金相とＦｅ−Ｃ相の２相混在組織、またはＦｅ−Ａｌ合金相とＦｅ−Ｃ相と炭素（Ｃ）相の３相混在組織を示した。また、強度を評価する目的で圧環強度を測定した結果も表１に示した。さらに表１にはビッカース硬さも示した。 As a result of observing the structure of the sintered valve seats 1 to 7 and the conventional sintered valve sheets 1 to 7 obtained as a result using a metal microscope, the sintered valve seats of the present invention are shown in Table 1. 1 to 7 all indicate a single phase structure of Fe—Al—C solid solution, and the conventional sintered valve seats 1 to 7 each have a two-phase mixed structure of Fe—Al alloy phase and Fe—C phase, or Fe—Al. A three-phase mixed structure of an alloy phase, an Fe-C phase, and a carbon (C) phase was shown. The results of measuring the crushing strength for the purpose of evaluating the strength are also shown in Table 1. Table 1 also shows the Vickers hardness.
回転数：３０００ｒｐｍ、
相手材(バルブ)：ＪＩＳ・ＳＵＨ３５（耐熱鋼）製本体にステライト１２を１ｍｍの厚さで肉盛りしたもの、
試験時間：２００時間、
の条件で実機高速運転摩耗試験を行い、試験後、最大摩耗深さを測定すると共に、相手材であるバルブの最大摩耗深さも測定した。この結果も表１に示した。
Rotational speed: 3000rpm,
Counterpart material (valve): A JIS / SUH35 (heat-resistant steel) body with Stellite 12 being 1 mm thick,
Test time: 200 hours
The actual machine high-speed operation wear test was performed under the conditions described above. After the test, the maximum wear depth was measured, and the maximum wear depth of the counterpart valve was also measured. The results are also shown in Table 1.
表１に示される結果から、Ｆｅ−Ａｌ−Ｃ固溶体単相組織を有するＦｅ−Ａｌ−Ｃ焼結合金で構成された本発明焼結バルブシート１〜７は、いずれも前記Ｆｅ−Ａｌ−Ｃ固溶体単相組織がすぐれた高温耐酸化性を有するので、特に低排ガス自動車であるＬＰガス自動車のエンジンに組み込まれた場合に、自動車の高速化および高出力化に伴ない、排ガスが８００〜９００℃の高温に達するにもかかわらず、きわめて小さい相手攻撃性で、すぐれた耐摩耗性を長期に亘って発揮するのに対して、Ｆｅ−Ａｌ合金相とＦｅ−Ｃ相の２相混在組織、またはＦｅ−Ａｌ合金相とＦｅ−Ｃ相と炭素（Ｃ）相の３相混在組織を有するＦｅ−Ａｌ−Ｃ焼結合金で構成された従来焼結バルブシート１〜７は、いずれも前記の苛酷な使用条件下では、Ｆｅ−Ｃ相に加えて、特に相境界部が高温耐酸化性の劣るものであるために酸化進行が速く、これが原因で摩耗が加速されることから、比較的短時間で使用寿命に至るものである。 From the results shown in Table 1, the sintered valve seats 1 to 7 of the present invention composed of an Fe-Al-C sintered alloy having a single-phase structure of Fe-Al-C solid solution are all said Fe-Al-C. Since the solid solution single-phase structure has excellent high-temperature oxidation resistance, when incorporated in an engine of an LP gas vehicle, which is a low exhaust gas vehicle, the exhaust gas is 800 to 900 as the vehicle speed increases and the output increases. In spite of reaching a high temperature of ° C., while exhibiting excellent wear resistance over a long period of time with extremely small opponent attack, a two-phase mixed structure of Fe—Al alloy phase and Fe—C phase, Or the conventional sintering valve seats 1-7 comprised with the Fe-Al-C sintered alloy which has a three-phase mixed structure | tissue of a Fe-Al alloy phase, a Fe-C phase, and a carbon (C) phase, Under severe usage conditions, Fe-C phase In addition, especially the phase boundary is fast oxidation progresses because of inferior high-temperature oxidation resistance, which is because the wear due is accelerated, but leading to a relatively short time service life.
上述のように、この発明のＦｅ−Ａｌ−Ｃ焼結合金製バルブシートは、ガソリンエンジンやディーゼルエンジンは勿論のこと、特に自動車の高速化および高出力化に伴ない、排ガスが８００〜９００℃の高温に達し、かつ低排ガスであるためにバルブシートとバルブの当接が金属同士の直接接触形態をとり、それだけ厳しい使用条件となるＬＰガス自動車のエンジンに組み込まれた場合にも、すぐれた耐摩耗性を長期に亘って発揮し、また高強度を有するので、薄肉化および小径化が可能となるので、自動車の高速化および高出力化、さらに軽量化および小型化に十分満足に対応できるものである。 As described above, the Fe-Al-C sintered alloy valve seat according to the present invention has an exhaust gas of 800 to 900 ° C. in addition to a gasoline engine and a diesel engine, particularly as the automobile speeds up and increases its output. Even when the valve seat and valve contact form a direct metal-to-metal contact because it is low exhaust gas, it is excellent even when incorporated in an LP gas vehicle engine, which is a severe use condition. Since wear resistance is demonstrated over a long period of time and it has high strength, it is possible to reduce the thickness and diameter, so that it can sufficiently satisfy the demand for higher speed, higher output, lighter weight and smaller size of automobiles. Is.
Claims (1)
Ａｌ：２０〜３０％、 Ｃ：０．５〜１．５％、
を含有し、残りがＦｅと不可避不純物からなる組成、並びにＦｅ−Ａｌ−Ｃ固溶体単相組織を有するＦｅ−Ａｌ−Ｃ焼結合金で構成してなる、すぐれた高温耐酸化性と高強度を有するＦｅ−Ａｌ−Ｃ焼結合金製バルブシート。 % By mass
Al: 20-30%, C: 0.5-1.5%,
With the composition comprising Fe and inevitable impurities as well as the Fe-Al-C sintered alloy having a single-phase structure of Fe-Al-C solid solution, excellent high temperature oxidation resistance and high strength Fe-Al-C sintered alloy valve seat.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003355917A JP2005120416A (en) | 2003-10-16 | 2003-10-16 | VALVE SEAT MADE OF Fe-Al-C SINTERED ALLOY HAVING SUPERIOR HIGH-TEMPERATURE OXIDATION RESISTANCE AND HIGH STRENGTH |
| PCT/JP2004/015121 WO2005038065A1 (en) | 2003-10-16 | 2004-10-14 | Fe-Al-C SINTERED ALLOY VALVE SHEET HAVING EXCELLENT OXIDATION RESISTANCE AT HIGH TEMPERATURE AND HIGH STRENGTH |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003355917A JP2005120416A (en) | 2003-10-16 | 2003-10-16 | VALVE SEAT MADE OF Fe-Al-C SINTERED ALLOY HAVING SUPERIOR HIGH-TEMPERATURE OXIDATION RESISTANCE AND HIGH STRENGTH |
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| Publication Number | Publication Date |
|---|---|
| JP2005120416A true JP2005120416A (en) | 2005-05-12 |
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| JP2003355917A Withdrawn JP2005120416A (en) | 2003-10-16 | 2003-10-16 | VALVE SEAT MADE OF Fe-Al-C SINTERED ALLOY HAVING SUPERIOR HIGH-TEMPERATURE OXIDATION RESISTANCE AND HIGH STRENGTH |
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| KR100742689B1 (en) | 2005-08-03 | 2007-07-25 | 나태엽 | The heat resisting steel alloy matter Method |
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| US11434549B2 (en) * | 2016-11-10 | 2022-09-06 | The United States Of America As Represented By The Secretary Of The Army | Cemented carbide containing tungsten carbide and finegrained iron alloy binder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001011591A (en) * | 1999-07-01 | 2001-01-16 | Mitsubishi Materials Corp | Wear resistant ring for lightweight piston ring excellent in high temperature wear resistance and thermal conductivity |
| JP4223185B2 (en) * | 2000-11-08 | 2009-02-12 | 三菱マテリアルＰｍｇ株式会社 | Iron aluminide-based bond metal with small opponent attack and excellent machinability and method for producing the same |
-
2003
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100742689B1 (en) | 2005-08-03 | 2007-07-25 | 나태엽 | The heat resisting steel alloy matter Method |
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