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Heat-resistant sintered material having excellent oxidation resistance, wear resistance at high temperatures and salt damage resistance, and method for producing same

A technology of wear resistance and oxidation resistance, applied in the direction of turbines, mechanical equipment, etc., can solve the problems of wear resistance deterioration, powder compressibility deterioration, and failure to form, achieving excellent corrosion resistance and heat resistance, Excellent wear resistance effect

Active Publication Date: 2017-12-01
DIAMET CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, if the precipitation of high-Cr carbide particles is given priority, the amount of Cr in the parent phase will decrease, so there will be problems in oxidation resistance and salt corrosion resistance. If the number of high-Cr carbide particles is reduced, there will be wear resistance Deterioration problem
[0017] In addition, if the amount of Cr in the entire alloy is increased in the sintered material, the compressibility of the powder will deteriorate, and there is a problem that it cannot be molded into the desired shape.
[0018] In addition, in the structure in which high-Cr carbide particles are precipitated in the parent phase, if the amount of high-Cr carbide particles precipitated is increased, the wear resistance of the sintered material itself is good, but the loss of the counterpart material due to sliding increases. The problem

Method used

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  • Heat-resistant sintered material having excellent oxidation resistance, wear resistance at high temperatures and salt damage resistance, and method for producing same
  • Heat-resistant sintered material having excellent oxidation resistance, wear resistance at high temperatures and salt damage resistance, and method for producing same
  • Heat-resistant sintered material having excellent oxidation resistance, wear resistance at high temperatures and salt damage resistance, and method for producing same

Examples

Experimental program
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Effect test

Embodiment 1

[0110] "Example 1"

[0111] As raw material powder, Fe-25Cr-20Ni alloy powder, Cr-40Fe alloy powder, Ni-12P alloy powder are prepared, and these raw material alloy powders are blended to make it into the final composition shown in the following tables 1-3, and V After mixing in a type mixer for 30 minutes, press molding was performed at a molding pressure of 588 MPa to produce a cylindrical green compact.

[0112] Next, this green compact was sintered at a temperature of 1250 to 1280° C. for 1.5 hours in a vacuum atmosphere to obtain heat-resistant sliding materials (sample Nos. 1 to 29).

[0113] In addition, Fe-25Cr-2Mo alloy powder, Cr-40Fe alloy powder, and Fe-27P alloy powder were prepared as raw material powders, and these raw material alloy powders were blended to obtain the final composition shown in Table 4 below, so as to be compatible with Heat-resistant sliding materials (sample Nos. 30 to 35) were obtained in the same manner as in sample Nos. 1 to 29.

[0114] A...

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Abstract

The purpose of this heat-resistant sintered material and a production method thereof is to obtain a heat-resistant sintered material that has excellent oxidation resistance, wear resistance at high temperatures, and salt damage resistance. This heat-resistant sintered material is characterized by: having a composition that contains, in mass%, 25-50% of Cr, 2-25% of Ni and 0.2-1.2% of P, with the balance made up of Fe and unavoidable impurities; and having a structure that comprises an Fe-Cr matrix and hard phases that are dispersed within the Fe-Cr matrix and are composed of Cr-Fe alloy grains. This heat-resistant sintered material is also characterized in that: the Cr content in the Fe-Cr matrix is 24-41% by mass; the Cr content in the hard phases is 30-61% by mass; and the intercommunicating porosity is 2% or less.

Description

technical field [0001] The present invention relates to a heat-resistant sintered material excellent in oxidation resistance, high-temperature wear resistance, and salt corrosion resistance, and a method for producing the same. [0002] This application claims priority based on Japanese Patent Application No. 2015-066748 for which it applied in Japan on March 27, 2015, and uses the content here. Background technique [0003] Among internal combustion engines, there is known a turbocharger that utilizes the energy of exhaust gas to rotate a turbine at a high speed, drives a centrifugal compressor with the rotational force, and sends compressed air into the engine to improve the performance of the internal combustion engine. Thermal efficiency. [0004] A turbocharger attached to an internal combustion engine is provided with a nozzle mechanism and a valve mechanism that divide a part of the exhaust gas to adjust the inflow amount of the exhaust gas to the turbine. [0005] ...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C30/00C22C33/02B22F1/00
CPCC22C30/00C22C38/00B22F5/009C22C1/045C22C33/0214C22C33/0285B22F2998/10C22C27/06C22C38/22C22C38/44C22C38/002C22C38/40B22F1/00B22F1/09B22F3/02B22F3/10B22F3/16B22F2301/35
Inventor 加藤健一水野达规宫原正久
Owner DIAMET CORP
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