KR20010057554A - A sintered alloy composition for valve guide - Google Patents

A sintered alloy composition for valve guide Download PDF

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KR20010057554A
KR20010057554A KR1019990068248A KR19990068248A KR20010057554A KR 20010057554 A KR20010057554 A KR 20010057554A KR 1019990068248 A KR1019990068248 A KR 1019990068248A KR 19990068248 A KR19990068248 A KR 19990068248A KR 20010057554 A KR20010057554 A KR 20010057554A
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South Korea
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alloy material
weight
valve guide
powder
composition
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KR1019990068248A
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Korean (ko)
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임종대
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이계안
현대자동차주식회사
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Publication of KR20010057554A publication Critical patent/KR20010057554A/en

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • C22C33/0228—Using a mixture of prealloyed powders or a master alloy comprising other non-metallic compounds or more than 5% of graphite
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or silicon

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Abstract

PURPOSE: A sintering alloy material composition is provided which has superior properties to an existing sintering alloy material for valve guide by adding a certain amount of boron nitride to an existing iron sintering alloy material, thereby improving abrasion resistance, and adding silicate powder, thereby developing a material having superior machinability. CONSTITUTION: The sintering alloy material composition for a valve guide comprises a main constituent of iron, 1.7 to 2.5 wt.% of carbon, 4.0 to 6.0 wt.% of copper, 0.2 to 0.55 wt.% of tin, 0.15 to 0.4 wt.% of phosphorus, 0.3 to 1.5 wt.% of boron and 0.3 to 2.5 wt.% of silicon, wherein the boron is contained by using 0.5 to 2.0 wt.% of rigid particles of boron nitride alloy powder for the total sintering alloy material composition, and the silicon is contained by using 0.5 to 3.0 wt.% of silicate powder for the total sintering alloy material composition.

Description

밸브 가이드용 소결합금재 조성물{A sintered alloy composition for valve guide}A sintered alloy composition for valve guide

본 발명은 밸브 가이드용 소결합금재 조성물에 관한 것으로써, 더욱 상세하게는 종래 철계 소결합금재에 보론 니트라이드(Boron nitride) 입자를 적절한 배합비로 기지조직에 분산시킴으로써 경질 입자 분산에 의하여 내마모성을 향상시키고, 또한 실리케이트 입자를 첨가함으로써 피삭성을 향상시킨 밸브 가이드용 소결합금재 조성물에 관한 것이다.The present invention relates to a sintered alloy material for valve guides, and more particularly, to improve wear resistance by dispersing hard particles by dispersing boron nitride particles in a matrix structure at an appropriate blending ratio. It is related with the small-bonding material composition for valve guides which improved the machinability by adding the silicate particle | grains to this.

종래의 밸브 가이드용 소결합금재 조성물은 철을 주성분으로 하고, 탄소 1.7 ∼ 2.5 중량%, 구리 4.0 ∼ 6.0 중량%, 주석 0.2 ∼ 0.55 중량% 및 인 0.15∼ 0.4 중량%의 화학 성분으로 구성되며, 마모와 응착마모(abrasive and adhesive wear)를 방지하기 위하여 Fe-C-P의 3상 공정조직(스테다이트 상 , Hv 600)을 균일하게 분포하는 방법을 사용하였다(즉, 경질상에 의한 분산 강화형 내마모 재료임). 또한, 요구강도를 부여하기 위해 구리 성분에 의한 철 기지를 강화하는 방법을 사용한 바, 이러한 종래의 밸브 가이드용 소결합금재 조성물의 제조 방법을 각 제조 공정에 따라 더욱 상세히 설명하면 다음과 같다.Conventional sintered alloy material for valve guide is composed mainly of iron 1.7, 2.5% by weight of carbon, 4.0-6.0% by weight of copper, 0.2-0.55% by weight of tin and 0.15-0.4% by weight of phosphorus, In order to prevent abrasive and adhesive wear, the method of uniformly distributing the three-phase Fe-CP process structure (steite phase, Hv 600) was used (i.e., strengthening dispersion by hard phase). Wear-resistant material). In addition, the method of reinforcing the iron base by the copper component in order to impart the required strength, and the conventional method for producing a non-alloy material composition for the valve guide according to each manufacturing process will be described in more detail as follows.

먼저, 원자화된 철 분말에 90% Cu-10% Sn의 청동 분말, Fe3P 분말 및 흑연 분말을 배합한다. 상기와 같이 배합된 혼합분말을 가압 성형(5 톤/cm2, 50 톤 프레스 사용)한 후, 1030 ∼ 1050℃ 의 엔도 가스 분위기하에서 소결한 다음에, 상기 소결된 조성물을 기계 가공한다.First, the atomized iron powder is blended with 90% Cu-10% Sn bronze powder, Fe 3 P powder and graphite powder. The mixed powder blended as described above is press-molded (using a 5 ton / cm 2 , 50 ton press), followed by sintering in an endo gas atmosphere at 1030 to 1050 ° C., and then the sintered composition is machined.

그러나, 이러한 방법에 의해 제조되는 밸브 가이드용 소결합금재 조성물의 경우, Fe-C-P의 스테다이트 조직의 분산 강화에 의한 내마모성은 일반 가솔린 엔진에서는 충분하지만, 터보 과급기(turbo charger) 또는 TCI(turbo charger intercooler)를 장착한 고성능 디젤 엔진에서는 내마모성이 부족한 문제점이 있었다. 또한, 밸브 가이드를 실린더-헤드에 압입후 내결가공시 피삭성은 생산성과 직결되는 바, 종래 재료는 경질상을 다량 분포하고 있어 피삭성이 불리한 문제점도 가지고 있었다.However, in the case of the non-bonded gold alloy composition for valve guide produced by such a method, the wear resistance by strengthening the dispersion of the steadite structure of Fe-CP is sufficient in a general gasoline engine, but turbocharger or TCI (turbo charger) A high performance diesel engine equipped with a charger intercooler has a problem of lack of wear resistance. In addition, since the machinability of the valve guide after press-fitting the cylinder-head into the cracking process is directly related to the productivity, the conventional material has a large amount of hard phases, which also has a disadvantage in machinability.

상기한 바와 같이, 종래의 밸브 가이드용 소결합금재 조성물은 고성능 디젤 엔젠에서는 내마모성이 부족하고, 경질상을 다량 분포하고 있어 피삭성이 불리한 문제가 있다. 따라서, 이러한 종래의 문제점을 개선하기 위하여, 본 발명은 종래 철계 소결합금재에 일정량의 보론 니트라이드(Boron nitride)입자를 첨가하여 내마모성을 향상시키고, 실리케이트 입자를 첨가하여 피삭성이 우수한 재료를 고안함으로써 종래의 밸브 가이드용 소결합금재보다 우수한 성질을 갖는 소결합금재 조성물을 제공하는 데 그 목적이 있다.As described above, the conventional low-alloy alloy material for valve guides lacks wear resistance in high-performance diesel engines, has a large amount of hard phases, and has a disadvantage in machinability. Therefore, in order to improve such a conventional problem, the present invention improves wear resistance by adding a certain amount of boron nitride particles to the conventional iron-based sintered alloy material, and devised a material excellent in machinability by adding silicate particles. It is an object of the present invention to provide a small binder material composition having properties superior to those of the conventional small guide material for valve guides.

본 발명은 밸브 가이드용 소결합금재 조성물에 있어서,The present invention, in the small-bonding material composition for valve guide,

철을 주성분으로 하고, 탄소 1.7 ∼ 2.5 중량%, 구리 4.0 ∼ 6.0 중량%, 주석 0.2 ∼ 0.55 중량%, 인 0.15 ∼ 0.4 중량%, 붕소 0.3 ∼ 1.5 중량% 및 실리콘 0.3 ∼ 2.5 중량%가 함유되어 있는 밸브 가이드용 소결합금재 조성물에 관한 것이다.It contains iron as a main component and contains 1.7 to 2.5% by weight of carbon, 4.0 to 6.0% by weight of copper, 0.2 to 0.55% by weight of tin, 0.15 to 0.4% by weight of phosphorus, 0.3 to 1.5% by weight of boron and 0.3 to 2.5% by weight of silicon. The present invention relates to a small binder material composition for a valve guide.

또한, 본 발명에 따른 소결합금재 조성물에 함유된 붕소는 경질 입자인 보론 니트라이드(Boron nitride) 합금분말 0.5 ∼ 2.0 중량%가 사용되며, 상기 실리콘은 실리케이트 분말 0.5 ∼ 3.0 중량%를 사용하여 함유시키는 밸브 가이드용 소결합금재 조성물에 관한 것이다.In addition, boron contained in the small-bonded material composition according to the present invention is used in the boron nitride alloy powder (hard boron nitride) of 0.5 to 2.0% by weight, the silicon is contained using 0.5 to 3.0% by weight of silicate powder It relates to a small bond material for a valve guide to be made.

이와 같은 본 발명을 더욱 상세히 설명하면 다음과 같다.Referring to the present invention in more detail as follows.

본 발명은 우선 주성분으로 원자화된 철 분말을 사용하고, 90% Cu-10% Sn의 청동 분말 4 ∼ 6.5 중량%, Fe3P 분말 0.6 ∼ 1.6 중량%, 보론 니트라이드 분말 0.5 ∼ 2.0 중량%, 실리케이트 분말(50 ∼ 150 μm 크기) 0.5 ∼ 3.0 중량% 및 흑연 분말(10 μm이하 크기) 1.8 ∼ 2.0 중량%를 혼합함으로써, 전체 소결합금재 조성물중에 주성분인 철과, 탄소 1.7 ∼ 2.5 중량%, 구리 4.0 ∼ 6.0 중량%, 주석 0.2 ∼0.55 중량%, 인 0.15 ∼ 0.4 중량%에 추가적으로, 붕소 0.3 ∼ 1.5 중량% 및 실리콘 0.3 ∼ 2.5 중량%가 함유된 철계 소결합금재 조성물인 것을 특징으로 한다.The present invention first uses the iron powder atomized as a main component, 4 to 6.5% by weight of bronze powder of 90% Cu-10% Sn, 0.6 to 1.6% by weight of Fe 3 P powder, 0.5 to 2.0% by weight of boron nitride powder, By mixing 0.5 to 3.0 wt% of silicate powder (50 to 150 μm size) and 1.8 to 2.0 wt% of graphite powder (size of 10 μm or less), the main component iron, 1.7 to 2.5 wt% of carbon, In addition to 4.0 to 6.0% by weight of copper, 0.2 to 0.55% by weight of tin, and 0.15 to 0.4% by weight of phosphorus, 0.3 to 1.5% by weight of boron and 0.3 to 2.5% by weight of silicon-based iron binder composition is characterized in that the composition.

본 발명에서 특징적인 것은 내마모성을 향상시키기 위한 방법으로, 크기가 50 μm이하인 보론 니트라이드 분말 0.5 ∼ 2.0 중량%를 사용하는 것인데, 이로써 경질 입자의 분산강화에 의해 보론 니트라이드 입자들은 기지에 균일하게 분포하여 Fe-C-P의 3상 공정 조직과 함께 내마모성에 기여하게 된다. 이때 보론 니트라이드 분말의 사용함량을 0.5 ∼ 2.0 중량%로 한정하는 이유는, 0.5 중량% 미만 첨가시에는 충분한 내마모성 향상 효과를 나타낼 수 없으며, 2.0 중량%를 초과하면 피삭성을 해치므로 이에 한정하는 것이다. 이러한 본 발명에 따른 소결합금재에 첨가된 보론 니트라이드 입자의 중량%에 따른 내마모성의 개선효과는 0.5 중량% 첨가시 10%, 1.0 중량% 첨가시 20%, 2.0 중량% 첨가시 50% 정도 향상시킬 수 있다.A characteristic feature of the present invention is a method for improving wear resistance, using 0.5 to 2.0% by weight of boron nitride powder having a size of 50 μm or less, whereby boron nitride particles are uniformly formed on the substrate by strengthening the dispersion of hard particles. It contributes to wear resistance along with the three-phase process structure of Fe-CP. The reason for limiting the content of boron nitride powder to 0.5 to 2.0% by weight is that when added less than 0.5% by weight can not exhibit a sufficient wear resistance improvement effect, when exceeding 2.0% by weight will damage the machinability will be. The wear resistance improvement effect according to the weight% of boron nitride particles added to the sintered alloy material according to the present invention is improved by 10% at 0.5% by weight, 20% at 1.0% by weight, and 50% at 2.0% by weight. You can.

또한, 본 발명은 피삭성을 개선하기 위해서, 소결합금재 조성물에 실리케이트 분말(50 ∼ 150 μm 크기) 0.5 ∼ 3.0 중량%를 사용하는데, 상기 분말은 밸브 가이드를 실린더-헤드에 압입 후 리머로 내경 가공시 소결합금 내부에 존재하는 기공을 메움으로써 피삭성을 향상시키며, 이때 사용 함량을 상기 범위로 한정하는 이유는 0.5 중량% 미만에서는 가공 메꿈량이 충분하지 못하여 피삭성 향상을 기대할 수 없으며, 반면 3.0 중량%를 초과하면 강도가 현저히 저하될 우려가 있어 바람직하지 않다. 이러한 본 발명에서 사용되는 실리케이트 분말의 중량%에 따른 피삭성 개선효과 즉, 공구 수명연장은 0.5 중량% 첨가시 20%, 3.0 중량% 첨가시 100% 정도 향상된다.In addition, in order to improve the machinability, the present invention uses 0.5 to 3.0 wt% of silicate powder (50 to 150 μm size) in the small binder material composition, which is press-fitted to the cylinder guide to the cylinder head, and then used as the inner diameter of the reamer. Machining improves machinability by filling pores present in the small alloy during processing, and the reason for limiting the use content to the above range is that the amount of puffing is not sufficient at less than 0.5% by weight, whereas machinability improvement cannot be expected, whereas 3.0 When the weight% is exceeded, the strength may be significantly lowered, which is not preferable. The machinability improvement effect according to the weight% of the silicate powder used in the present invention, that is, the tool life extension is improved by about 20% when adding 0.5% by weight and 100% when adding 3.0% by weight.

상기와 같은 배합비로 혼합한 원료 분말 혼합물을 통상적인 제조 방법에 따라, 5 톤/cm2(50 톤 프레스 사용)으로 가압성형하는 공정과, 1030 ∼ 1050℃ 의 엔도 가스 분위기하에서 소결하는 공정, 그리고 기계 가공 공정을 거쳐 소결합금재를 제조함으로써, Fe-C-P 3상 조직과 보론 니트라이드 및 실리케이트가 Fe-Cu-C의 기지조직에 균일하게 분포하는 밸브가이드용 소결합금재인 본 발명을 완성한다.The process of press-molding the raw material powder mixture mixed at the above-mentioned mixing ratio at 5 ton / cm 2 (using a 50 ton press) according to a conventional production method, the step of sintering in an endo gas atmosphere at 1030 to 1050 ° C., and By manufacturing a small binder material through a machining process, the present invention is completed as the small binder material for valve guides in which Fe-CP three-phase structure, boron nitride and silicate are uniformly distributed in the matrix structure of Fe-Cu-C.

이와 같은 본 발명을 실시예에 의거하여 더욱 상세히 설명하겠는 바, 본 발명이 실시예에 의해 한정되는 것은 아니다.Although this invention is demonstrated in more detail based on an Example, this invention is not limited by an Example.

실시예 1 ∼ 3 및 비교예 1 ∼ 3Examples 1-3 and Comparative Examples 1-3

다음 표 1의 조성 및 함량이 되도록 각각 본 발명의 조성에 따른 실시예 1 ∼ 3 및 통상적인 조성의 비교예 1 ∼ 3를 만들었다.The following Examples 1 to 3 and Comparative Examples 1 to 3 of the conventional composition were made according to the composition of the present invention so as to have the composition and content of Table 1 below.

이렇게 배합된 분말을 5 톤/cm2압력으로 성형한 다음, 1030 ∼ 1050℃ 의 엔도 가스 분위기하에서 소결한 후 기계 가공을 거쳐 각각의 소결 합금재를 제조하였다.The powder thus blended was molded at a pressure of 5 ton / cm 2 , and then sintered in an endo gas atmosphere at 1030 to 1050 ° C., followed by machining to prepare respective sintered alloy materials.

구 분division 실 시 예Example 비 교 예Comparative Example 1One 22 33 1One 22 33 조성성분(중량%)Ingredients (% by weight) 탄 소Carbon 2.02.0 2.02.0 2.02.0 1.91.9 2.12.1 2.02.0 구 리Copper 4.74.7 4.64.6 4.84.8 4.84.8 4.64.6 4.74.7 주 석Remark 0.480.48 0.470.47 0.490.49 0.490.49 0.470.47 0.480.48 인sign 0.230.23 0.210.21 0.220.22 0.220.22 0.230.23 0.220.22 붕 소Boron 0.60.6 0.90.9 1.11.1 -- -- -- 실 리 콘silicon 1.51.5 1.41.4 1.51.5 -- -- -- 철iron 90.4990.49 90.4290.42 89.8989.89 92.5992.59 92.6092.60 92.6092.60

실험예 1 : 마모시험Experimental Example 1: Abrasion Test

상기와 같은 조성비로 혼합된 소결합금재에 대하여 마모시험을 하여 하기와 같은 결과를 얻었다.The abrasion test was performed on the small-bonded alloy material mixed in the above composition ratio to obtain the following results.

마모시험은 핀-온-디스크 마모 시험기를 이용하여 실시했으며, 마모량은 시험 전후의 중량을 1/10000 g까지 측정하여 비교하였다. 마모 시험조건은 하기 표 3에 나타내었고, 각 조성에 따른 마모량은 하기 표 2와 같으며, 마모시험편 재질에 있어서 핀은 소결합금재(실시예, 비교예)이고, 디스크는 내열강재(SUH 11)를 사용하였다.The abrasion test was carried out using a pin-on-disk abrasion tester, and the amount of abrasion was compared by measuring the weight before and after the test to 1/10000 g. The wear test conditions are shown in Table 3 below, and the amount of wear according to each composition is shown in Table 2 below. In the wear test piece material, the pin is a small alloy material (Example, Comparative Example), and the disk is heat-resistant steel (SUH 11 ) Was used.

항 목Item 조 건Condition 슬라이딩 형태Sliding mode 회 전rotation 슬라이딩 조건Sliding condition 2.8 m/sec2.8 m / sec 슬라이딩 거리Sliding distance 30 km30 km 적용 하중Applied load 10 kgf10 kgf 표면 조도Surface roughness Ra = 0.2 μmRa = 0.2 μm 온도 및 시험상태Temperature and test condition 상온, 무윤활Room temperature, no lubrication

물성Properties 실 시 예Example 비 교 예Comparative Example 1One 22 33 1One 22 33 핀 마모량(g)Pin Abrasion (g) 0.23410.2341 0.21370.2137 0.19840.1984 0.31400.3140 0.30240.3024 0.33560.3356 디스크 마모량(g)Disk wear (g) 0.01450.0145 0.01510.0151 0.01570.0157 0.01300.0130 0.01340.0134 0.01270.0127 합계(g)Total (g) 0.24860.2486 0.22880.2288 0.21410.2141 0.32700.3270 0.31580.3158 0.34830.3483

상기 표 3에 나타낸 바와 같이, 실시예 1의 경우 보론 니트라이드 합금분말 및 실리케이트 분말을 제외한 기타 분말의 조성비가 유사한 비교예 3과 비교하였을 때, 마모량이 약 29 % 정도 감소하여 내마모성이 향상되었음을 확인하였다.As shown in Table 3, in the case of Example 1, the wear amount of the other powder except for boron nitride alloy powder and silicate powder was about 29%, compared with similar Comparative Example 3 It was confirmed that the wear resistance was improved by decreasing the degree.

상기에서 상세히 설명한 바와 같이, 본 발명에 따르면 소결합금재 조성물에 일정량의 보론 니트라이드(Boron nitride)입자 및 실리케이트 입자를 첨가함으로써, 종래의 소결합금재보다 내마모성과 피삭성이 우수한 밸브 가이드용 소결합금재 조성물을 얻을 수 있는 효과가 있어 자동차 엔진의 내장재로 사용할 수 있다.As described in detail above, according to the present invention, by adding a certain amount of boron nitride particles and silicate particles to the small-bonding material composition, the low-alloy for valve guide excellent in wear resistance and machinability than the conventional small-bonding material It is effective to obtain the ash composition, so it can be used as interior materials for automobile engines.

Claims (3)

밸브 가이드용 소결합금재 조성물에 있어서,In the non-bonding material composition for valve guide, 철을 주성분으로 하고, 여기에 탄소 1.7 ∼ 2.5 중량%, 구리 4.0 ∼ 6.0 중량%, 주석 0.2 ∼ 0.55 중량%, 인 0.15 ∼ 0.4 중량%, 붕소 0.3 ∼ 1.5 중량% 및 실리콘 0.3 ∼ 2.5 중량%가 함유되어 있는 것임을 특징으로 하는 밸브 가이드용 소결합금재 조성물.Based on iron, 1.7 to 2.5 wt% carbon, 4.0 to 6.0 wt% copper, 0.2 to 0.55 wt% tin, 0.15 to 0.4 wt% phosphorus, 0.3 to 1.5 wt% boron, and 0.3 to 2.5 wt% silicon The sintered alloy material for valve guides, characterized in that it contains. 제 1 항에 있어서, 상기 붕소는 전체 소결합금재 조성물에 대하여, 경질 입자인 보론 니트라이드(Boron nitride)합금분말을 0.5 ∼ 2.0 중량%로 사용하여 함유시키는 것임을 특징으로 하는 밸브가이드용 소결합금재 조성물.The method of claim 1, wherein the boron is a sintered alloy material for the valve guide, characterized in that containing the boron nitride alloy powder of the hard particles in 0.5 to 2.0% by weight based on the total sintered alloy material composition Composition. 제 1 항에 있어서, 상기 실리콘은 전체 소결합금재에 대하여, 실리케이트 분말 0.5 ∼ 3.0 중량%를 사용하여 함유시키는 것임을 특징으로 하는 밸브 가이드용 소결합금재 조성물.The method of claim 1, wherein the silicon is contained in the silicate powder 0.5 to 3.0% by weight relative to the total sintered alloy material, characterized in that the small bond material for a valve guide.
KR1019990068248A 1999-12-31 1999-12-31 A sintered alloy composition for valve guide KR20010057554A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63203754A (en) * 1987-02-20 1988-08-23 Nissan Motor Co Ltd Sintered iron alloy having wear resistance at high temperature
KR900006103A (en) * 1988-10-03 1990-05-07 엠.씨.씨. 네델란드 비.뷔. Method for manufacturing bend member for track of chain conveyor and bend member for track of chain conveyor
JPH06158217A (en) * 1992-11-17 1994-06-07 Mitsubishi Materials Corp Valve guide member made of fe-based sintered alloy excellent in wear resistance
JPH09241701A (en) * 1996-03-05 1997-09-16 Hitachi Powdered Metals Co Ltd Powdery mixture for iron based sintering material
JPH10158766A (en) * 1996-11-29 1998-06-16 Miyoshi Gokin Kogyo Kk Copper alloy with heat resistance and wear resistance
JPH11350091A (en) * 1998-06-15 1999-12-21 Matsushita Electric Ind Co Ltd Bearing for motor and motor using this bearing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63203754A (en) * 1987-02-20 1988-08-23 Nissan Motor Co Ltd Sintered iron alloy having wear resistance at high temperature
KR900006103A (en) * 1988-10-03 1990-05-07 엠.씨.씨. 네델란드 비.뷔. Method for manufacturing bend member for track of chain conveyor and bend member for track of chain conveyor
JPH06158217A (en) * 1992-11-17 1994-06-07 Mitsubishi Materials Corp Valve guide member made of fe-based sintered alloy excellent in wear resistance
JPH09241701A (en) * 1996-03-05 1997-09-16 Hitachi Powdered Metals Co Ltd Powdery mixture for iron based sintering material
JPH10158766A (en) * 1996-11-29 1998-06-16 Miyoshi Gokin Kogyo Kk Copper alloy with heat resistance and wear resistance
JPH11350091A (en) * 1998-06-15 1999-12-21 Matsushita Electric Ind Co Ltd Bearing for motor and motor using this bearing

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