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Hard particle powder for sintered body

A technology of hard particles and sintered bodies, applied in the field of hard particle powder, can solve the problems that hard particles cannot fully meet the wear resistance of valve seat materials, smoke cannot protect valve seats, and are easy to wear and other problems

Active Publication Date: 2019-08-23
DAIDO STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the hard particles disclosed in Patent Documents 1, 2, etc. cannot sufficiently satisfy the wear resistance required for the valve seat material.
Therefore, there is concern that in the low temperature state after the engine is fired, the soot does not protect the valve seat and may be prone to wear

Method used

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  • Hard particle powder for sintered body
  • Hard particle powder for sintered body
  • Hard particle powder for sintered body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 30 and comparative example 1 to 44

[0069] 1. Fabrication of Specimen

[0070] 1.1 Manufacture of hard granular powder

[0071] The raw materials were blended to obtain the compositions shown in Table 1 and Table 2 (unit: mass %). The raw material mixture is melted, and the hard particle powder is obtained by the atomization method. The REM used in fabrication is a misch metal which is a mixture of La, Ce, Nd, Pr, Sm and Y. Tables 1 and 2 also show the sintered density of the sintered body containing the hard particle powder and the wear amount of the sintered body when subjected to the abrasion resistance test described below.

[0072] Table 1

[0073]

[0074] Table 1 (continued)

[0075]

[0076] Table 2

[0077]

[0078] Table 2 (continued)

[0079]

[0080] 1.2. Manufacture of sintered body

[0081] A mixture consisting of 69.2% by mass of pure iron powder (ASC100.29), 30% by mass of hard particle powder and 0.8% by mass of graphite powder (CPB) was prepared. 0.5 parts by weight of Zn—St...

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Abstract

Provided is a hard particle powder for a sintered body, consisting of: 0.01<=C<=3.5 mass %, 0.5<=Si<=4.0 mass %, 0.1<=Mn<=10.0 mass %, 0.1<=Ni<=35.0 mass %, 0.1<=Cr<=40.0 mass %, 5.0<=Mo<=50.0 mass %,0.1<=Fe<=30.0 mass %, and 0.01<=REM<=0.5 mass %, with a balance being Co and inevitable impurities. The sintered body comprising the hard particulate powder, a pure iron powder, and a graphite powderis also provided.

Description

technical field [0001] The present invention relates to a hard granular powder for sintered bodies. More specifically, the present invention relates to a rare earth metal (REM)-added hard particle powder which is excellent in powder characteristics or sintering characteristics, and when a sintered body (for example, an automobile engine) is produced by using the hard particle powder seat), high wear resistance can be achieved. Background technique [0002] As is well known, TRIBALOY (registered trademark) T-400 is a Co-based hard particle having high wear resistance and forming a hard phase mainly containing molybdenum silicide. Co-2.5Si-28Mo-8.5Cr-based alloy powder, which is an equivalent material of TRIBALOY (registered trademark) T-400, is often used as a valve seat for an automobile engine that significantly contributes to improvement in automobile engines to which a high load is applied (below Herein, referred to as "valve seat") wear-resistant hard particles. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C19/05C22C19/07C22C30/00B22F1/12
CPCC22C30/00C22C19/07C22C19/052B22F1/09B22F1/12B22F2998/10B22F1/10B22F3/02B22F3/10C22C1/0433C22C1/045C22C33/0207C22C33/0278C22C33/0285B22F2999/00F01L2800/18F01L2810/02F01L3/02F01L2303/00B22F2201/013B22F2201/02C22C1/058C22C38/44C22C38/58C22C38/56B22F2302/40B22F2301/35B22F3/16
Inventor 长濑石根山本知己远藤隆久河野俊介服部广基
Owner DAIDO STEEL CO LTD