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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  • Abstract
  • Description
  • Claims
  • Application Information

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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 compr

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

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[0110] "Example 1"

[0111] As raw material powders, prepare Fe-25Cr-20Ni alloy powder, Cr-40Fe alloy powder, and Ni-12P alloy powder, and blend these raw alloy powders to have the final composition shown in Tables 1 to 3 below. Use V After mixing for 30 minutes with a type mixer, press molding was performed at a molding pressure of 588 MPa to produce a cylindrical compact.

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

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

[0114] Any sintered sliding material is formed into a shape suitable for the fol...

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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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