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Hard particles, sliding member, and method for producing sintered alloy

A technology of hard particles and sliding components, applied in the parts in contact between valve elements and valve seats, engine elements, machines/engines, etc., which can solve problems such as high cost and worry about procurement risks

Pending Publication Date: 2022-04-15
TOYOTA JIDOSHA KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, CoMo-based hard particles are costly due to the use of Co, and there are also concerns about procurement risks.

Method used

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  • Hard particles, sliding member, and method for producing sintered alloy
  • Hard particles, sliding member, and method for producing sintered alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～13、 comparative example 1～8

[0152]

[0153] Using a raw material weighing as a manner as shown in Table 1, a powder was produced by a gas atomization method or a water atomization method, and the obtained powder was classified of 44 to 250 μm, which was used as a hard particle. The average particle diameter of the hard particles was 100 μm.

[0154] Table 1

[0155]

[0156]

[0157] (Mixed powder production process)

[0158] A mixed powder using the following material is fabricated in a manner as the composition shown in Table 1. When the mixed powder is set to 100% by mass, 0.8% by mass of zinc stearate is used as a lubricant.

[0159] · Graphite particles: graphite particles (CPB-S, Japanese Graphite Industry)

[0160] · Iron particles: reduction iron powder (JIP255M-90, JFE steel)

[0161] · Cu Particles: Atomized copper powder (Cu-AT-G-100, Futian metal foil powder industry)

[0162] · Felt: Nocolokflux, Solvay

[0163] · Second hard particles: FEMO particles (MO: 65% by mass, Si: 1% by mass. Marum:...

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Abstract

The invention relates to hard particles, a sliding member, and a method for producing a sintered alloy. Provided are hard particles in which Cr and W, which are rapidly diffused in Mo, coexist with Ni and Mn. Specifically, the hard particles contain 5-20% by mass of Cr, 2-19% by mass of W, 25-40% by mass of Mo, 10-22% by mass of Ni, 10% by mass or less of Mn, 2.0% by mass or less of C, and 2.0% by mass or less of Si, with the remainder comprising unavoidable impurities and Fe.

Description

Technical field [0001] The present invention relates to a method for producing a hard particle, a sliding member, and a sintered alloy. More specifically, the hard particles for obtaining a sintered alloy having excellent wear-resistant resistance to the sliding member (especially the valve seat) which can be an internal combustion engine, the use of the sliding member obtained using the hard particles, and the sintering of the sliding member can be used. Method of manufacturing alloy. Background technique [0002] The engine valve seat of the vehicle (hereinafter referred to as "valve seat") is used to ensure the pressure of the combustion chamber by close contact (adhesion) with the valve when the valve is closed. Such a valve seat requires high abrasion resistance when exposed to a high temperature and low oxidation. [0003] Further, as a valve seat excellent in wear resistance, a sintered valve seat made of an iron-based burns allocated with a hard particle is known. Among t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/34C22C38/44C22C38/56C22C38/58F16K51/00B22F3/02B22F3/10B22F5/00C22C30/00
CPCC22C38/16C22C30/00C22C33/0285B22F2998/10F16K1/42F01L3/04F01L2301/00F01L2820/01B22F2009/0828B22F1/09B22F3/02B22F3/10C22C33/02B22F3/16F16K25/005B22F2301/35B22F9/082
Inventor 鸭雄贵吉田裕作井上裕太
Owner TOYOTA JIDOSHA KK