Metal member and manufacturing method thereof

Abstract

A metal member related to the present invention is provided with crystal grains of a metal and a granular reinforcing substance formed at boundaries of the crystal grains. The reinforcing substance includes grains of a shape with a grain area equivalent grain size larger than 1 / 100 of a grain area equivalent grain size of the crystal grains. The granular reinforcing substance preferably includes grains with a grain area equivalent grain size smaller than ⅕ of the grain area equivalent grain size of the crystal grains. Additionally, the granular reinforcing substance preferably includes grains of a shape wherein a value of a length, in a first direction in which a length thereof is longest, divided by a length of a longest part in a direction orthogonal to the first direction is smaller than 5. A metal member with a high strength at high temperatures is manufactured by metal powder injection molding.

Description

TECHNICAL FIELD[0001]The present invention is related to metal member using metal powder as material and manufacturing method thereof.BACKGROUND ART[0002]Metal powder injection molding (or metal injection molding) is a method of manufacturing a metal powder molded article by melting a molding material, which results by mixing fine metal powder and organic binder (for example, a mixture of a plurality of types of resins; hereinafter called “binder”) to perform injection molding thereof and then performing degreasing and incinerating thereof.[0003]The fine metal powder used in metal powder injection molding is formed in a fine powder production process by a spray method, for example. There were cases where production of fine powder for metal powder injection molding is difficult because a “pouring blockage”, in which a nozzle is blocked in a process of producing fine powder, occurs when forming a nickel based alloy including titan with a high strength at high temperatures by the spray...

AI Technical Summary

Benefits of technology

The present invention aims to manufacture a metal member with high strength at high temperatures using metal powder injection molding. To achieve this, a metal member is provided with crystal grains of a metal and a granular reinforcing substance formed at the boundaries of the crystal grains. The reinforcing substance includes grains with a grain area equivalent grain size larger than 1 / 100 of the crystal grains and is preferably formed so that a value of a length, in a first direction in which a length thereof is longest, divided by a length of a oldest part in a direction orthogonal to the first direction is smaller than 5. The reinforcing substance can also include a plurality of types of substances and be formed to surround the crystal grains. Additionally, a manufacturing method of the metal member by injection molding is also provided, which involves mixing metal powder, reinforcing powder, and binder, forming an intermediate molded body, and incinerating it. The reinforcing powder includes a reinforcing substance with a maximal grain size smaller than ⅕ of the metal powder. The invention allows for the manufacture of metal members with high strength at high temperatures using metal powder injection molding.

Problems solved by technology

A metal manufactured by metal powder injection molding has lower strength at high temperatures compared to a metal manufactured by casting or forging and could not be applied to members needing strength at high temperatures.

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