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

Patent metadata

Field	Value
Publication number	US-2017304893-A1
Application number	US-201515520463-A
Country	US
Kind code	A1
Filing date	Dec 1, 2015
Priority date	Dec 26, 2014
Publication date	Oct 26, 2017
Grant date	—

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

1 : A lubricant comprising a flaky organic material having an average particle diameter of from 0.1 μm to less than 3 μm,
wherein the lubricant is suitable for incorporation into a metallurgical mixed powder comprising an iron-based powder.

2 : The lubricant according to claim 1 , wherein the flaky organic material has substantially no melting point.

3 : The lubricant according to claim 1 , wherein the flaky organic material comprises melamine cyanurate.

4 : The lubricant according to claim 1 , further comprising an amide compound, wherein the lubricant comprises the 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.

5 : The lubricant 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.

6 : The lubricant according to claim 1 , wherein the metallurgical mixed powder further comprises an auxiliary material powder.

7 : The lubricant according to claim 6 , wherein the auxiliary material powder comprises graphite.

8 : A metallurgical mixed powder, comprising:
an iron-based powder; and the lubricant according to claim 1 .

9 : The metallurgical mixed powder according to claim 8 , further comprising a binder, wherein 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.

10 : The metallurgical mixed powder according to claim 9 ,
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.

11 : The metallurgical mixed powder according to claim 8 , further comprising an auxiliary material powder.

12 : The metallurgical mixed powder according to claim 11 , wherein the auxiliary material powder comprises graphite.

13 : A method for producing a sintered compact, the method comprising:
mixing materials to obtain a metallurgical mixed powder comprising:
an iron-based powder; and
the lubricant 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.

14 : The method according to claim 13 ,
wherein the mixing comprises mixing materials comprising:
the iron-based powder;
the lubricant; and
an auxiliary material powder.

15 : The method according to claim 14 , wherein the auxiliary material powder comprises graphite.

Assignees

• Kobe Steel Ltd

Inventors

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

Classifications

• C10N2050/08

  Solids · CPC title

• C10N2050/14

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

• C10N2040/24

  without essential removal of material {, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding}; Punching metal · CPC title

• C10N2060/00

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

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title