Compound for metal powder injection molding, metal powder molded body, method for producing sintered body, and sintered body

Patent metadata

Field	Value
Publication number	US-2018250738-A1
Application number	US-201815899865-A
Country	US
Kind code	A1
Filing date	Feb 20, 2018
Priority date	Mar 6, 2017
Publication date	Sep 6, 2018
Grant date	—

Abstract

A compound for metal powder injection molding includes secondary particles in which first metal particles are bound to one another, and a matrix region including a binder and second metal particles whose constituent material is different from that of the first metal particles. It is preferred that in the secondary particles, the first metal particles are bound to one another through the binder. It is also preferred that the average particle diameter of the second metal particles is smaller than that of the first metal particles.

First claim

What is claimed is:

1 . A compound for metal powder injection molding, comprising:
secondary particles in which first metal particles are bound to one another; and a matrix region including a binder and second metal particles whose constituent material is different from that of the first metal particles.

2 . The compound for metal powder injection molding according to claim 1 , wherein the constituent material of the first metal particles is any of an Fe-based alloy, an Ni-based alloy, and a Co-based alloy.

3 . The compound for metal powder injection molding according to claim 1 , wherein in the secondary particles, the first metal particles are bound to one another through the binder.

4 . The compound for metal powder injection molding according to claim 1 , wherein in the secondary particles, the first metal particles are adhered to one another.

5 . The compound for metal powder injection molding according to claim 1 , wherein the secondary particles are dispersed in the matrix region.

6 . The compound for metal powder injection molding according to claim 1 , wherein the average particle diameter of the second metal particles is smaller than that of the first metal particles.

7 . A metal powder molded body, comprising:
secondary particles in which first metal particles are bound to one another; and a matrix region including a binder and second metal particles whose constituent material is different from that of the first metal particles.

8 . A method for producing a sintered body, comprising:
injecting the compound for metal powder injection molding according to claim 1 into a molding die thereby obtaining a molded body; and firing the molded body thereby obtaining a sintered body.

9 . A method for producing a sintered body, comprising:
injecting the compound for metal powder injection molding according to claim 2 into a molding die thereby obtaining a molded body; and firing the molded body thereby obtaining a sintered body.

10 . A method for producing a sintered body, comprising:
injecting the compound for metal powder injection molding according to claim 3 into a molding die thereby obtaining a molded body; and firing the molded body thereby obtaining a sintered body.

11 . A method for producing a sintered body, comprising:
injecting the compound for metal powder injection molding according to claim 4 into a molding die thereby obtaining a molded body; and firing the molded body thereby obtaining a sintered body.

12 . A method for producing a sintered body, comprising:
injecting the compound for metal powder injection molding according to claim 5 into a molding die thereby obtaining a molded body; and firing the molded body thereby obtaining a sintered body.

13 . A method for producing a sintered body, comprising:
injecting the compound for metal powder injection molding according to claim 6 into a molding die thereby obtaining a molded body; and firing the molded body thereby obtaining a sintered body.

14 . A sintered body, comprising:
a first portion including a sintered material of first metal particles; and a second portion enclosing the first portion, and including a sintered material of second metal particles whose constituent material is different from that of the first metal particles.

15 . The sintered body according to claim 9 , wherein the average crystal grain diameter of the second portion is smaller than that of the first portion.

Assignees

• Seiko Epson Corp

Inventors

• Nakamura Hidefumi
• Hideshima Yasutoshi

Classifications

• B22F1/148

  Agglomerating · CPC title

• B22F1/103

  containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent · CPC title

• B22F1/107

  containing organic material comprising solvents, e.g. for slip casting · CPC title

• B22F1/102

  Metallic powder coated with organic material · CPC title

• B22F9/026

  Spray drying of solutions or suspensions · CPC title