Lubricant, mixed powder for powder metallurgy, and method for producing sintered body

Patent metadata

Field	Value
Publication number	US-10500638-B2
Application number	US-201515520463-A
Country	US
Kind code	B2
Filing date	Dec 1, 2015
Priority date	Dec 26, 2014
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

One aspect of the present invention is a lubricant to be incorporated into a powder metallurgical mixed powder containing an iron-based powder. The lubricant includes a flaky organic material having an average particle diameter of from 0.1 μm to less than 3 μm. Another aspect of the present invention is a powder metallurgical mixed powder which contains an iron-based powder and the lubricant. Yet another aspect of the present invention is a method for producing a sintered compact. The method includes the step of mixing materials to give a powder metallurgical mixed powder containing an iron-based powder and the lubricant. The powder metallurgical mixed powder is compacted using a die to give a powder compact. The powder compact is sintered to give a sintered compact.

First claim

The invention claimed is:

1. A metallurgical mixed powder, comprising:
an iron-based powder;
a lubricant; and
a binder,
wherein the lubricant comprises:
a flaky organic material having an average particle diameter of from 0.1 μm to less than 3 μm,

wherein the flaky organic material comprises melamine cyanurate, and
the binder comprises at least one component selected from the group consisting of:
a polyolefin having a melting point of 45° C. to 90° C. and a melt flow rate at 190° C. of 2.8 g/10 min. to 3.8 g/10 min.; and
an acrylic resin having a weight-average molecular weight of 50×10 4 or less.

2. The metallurgical mixed powder according to claim 1 ,
wherein the binder comprises both the polyolefin and the acrylic resin, and
wherein the binder comprises the acrylic resin in a content of 10 parts by mass or more per 100 parts by mass of the polyolefin.

3. The metallurgical mixed powder according to claim 1 , further comprising an auxiliary material powder.

4. The metallurgical mixed powder according to claim 3 , wherein the auxiliary material powder comprises graphite.

5. The metallurgical mixed powder according to claim 1 , wherein the flaky organic material has substantially no melting point.

6. The metallurgical mixed powder according to claim 1 , wherein the lubricant further comprises an amide compound in a content of 10 parts by mass to 90 parts by mass per 100 parts by mass of the flaky organic material.

7. The metallurgical mixed powder according to claim 1 , wherein the flaky organic material has undergone at least one surface treatment selected from the group consisting of: a silicone treatment and a fatty acid treatment.

8. A method for producing a sintered compact, the method comprising: mixing materials to obtain the metallurgical mixed powder according to claim 1 ; compacting the metallurgical mixed powder using a die to obtain a powder compact; and sintering the powder compact to obtain a sintered compact.

9. The method according to claim 8 ,
wherein the mixing comprises mixing materials comprising:
the iron-based powder;
the lubricant; and
an auxiliary material powder.

10. The method according to claim 9 , wherein the auxiliary material powder comprises graphite.

Assignees

• Kobe Steel Ltd

Inventors

• Ito Yoshihiro
• Yoshikawa Eiichiro
• Akagi Nobuaki
• Taniguchi Yuji
• Sato Mitsuhiro

Classifications

• C10M2215/2225

  used as base material · CPC title

• C10M105/70

  as ring hetero atom · CPC title

• C10N2060/00

  Chemical after-treatment of the constituents of the lubricating composition · CPC title

• C10N2050/14

  Composite materials or sliding materials in which lubricants are integrally molded · CPC title

• C10N2050/08

  Solids · CPC title