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Sintered sliding member and method for producing same

A technology for sliding parts and manufacturing methods, which is applied in the field of solid lubricant dispersed sintered sliding parts, which can solve problems such as inability to use in high temperature areas, increased cost of EGR units, and shaft wear, and achieve good wear resistance, less pores, and improved The effect of corrosion resistance

Active Publication Date: 2021-11-05
DIAMET CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] For the bearings used in the exhaust valves of EGR and the like mentioned above in the high temperature environment, although the structure in which hard particles are dispersed in the matrix is ​​adopted in the prior art in order to improve the wear resistance, the bearings in the shaft In the case of low hardness, there is a problem of shaft wear
[0011] In order to suppress the wear of the shaft, it is necessary to apply a hard material to the shaft, which has the problem of increasing the cost of the EGR unit
[0012] In addition, conventional wear-resistant materials used for valve seats have many pores and cannot be used in high-temperature areas.

Method used

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  • Sintered sliding member and method for producing same
  • Sintered sliding member and method for producing same
  • Sintered sliding member and method for producing same

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Embodiment

[0103] Hereinafter, the present invention will be described in more detail by showing examples, but the present invention is not limited to these examples.

[0104] As the raw material powder, any one of SUS310 alloy powder (particle size D50=100 μm), SUS316 alloy powder (particle size D50=100 μm) and SUS430 alloy powder (particle size D50=100 μm) specified in JIS was used as the base powder.

[0105] FeP powder (sintering aid: D50 = 30 μm) and any one of the following powders were added to the base powder. Regarding the addition of powders other than MoS 2 In addition to powder (D50=4μm), FeCr alloy powder (particle size D50=50μm), FeSi alloy powder (particle size D50=50μm) and FeS are added as needed 2 Alloy powder (particle diameter D50 = 100 μm) was mixed with a V-type mixer for 30 minutes so as to obtain the compositions of each example shown in Table 1 (Examples 1-11, Comparative Examples 1-11) to prepare raw material mixed powder.

[0106]Next, FeP powder as a sinteri...

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Abstract

A heat-resistant sintered sliding member (1) is characterized by having a structure in which lubricating phases (3) are dispersed in a matrix phase (2), wherein the overall composition has a composition containing 18-35% of Cr, 0.3-15% of Mo, 0-30% of Ni, 0.5-6% of Si, 0.2-4.0% of S, 0-1.2% of P and 0-0.8% of B, with the remainder comprising Fe and unavoidable impurities. The matrix phase (2) is a Fe-Cr-Mo-Si-based matrix phase or a Fe-Cr-Mo-Ni-Si-based matrix phase; the lubricating phases (3) contain chromium sulfide; and the porosity of the sliding member as a whole is 2.0% or less.

Description

technical field [0001] The present invention relates to a heat-resistant solid lubricant-dispersed sintered sliding part with less pairing attack in sliding wear and a method for manufacturing the same. [0002] This application claims priority based on patent application No. 2019-083259 filed in Japan on April 24, 2019 and patent application No. 2020-076829 filed in Japan on April 23, 2020, and the contents thereof are hereby cited. Background technique [0003] In internal combustion engines, exhaust gas recirculation systems (EGR) are known which regulate the combustion temperature of the engine by returning a portion of the exhaust gas to the intake side of the engine. Bearings and bushings for valve shafts used in this EGR are used near the exhaust gas discharged from the engine, so not only are they often exposed to high-temperature corrosive exhaust gas, but also they are movable parts, so they are also excellent in sliding characteristics. [0004] Co-based wear-res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C38/00
Inventor 福田亮介高藤庸平
Owner DIAMET CORP
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