Method for manufacturing αfe-sic composite material, and αfe-sic composite material

Patent metadata

Field	Value
Publication number	US-2021316361-A1
Application number	US-201917266371-A
Country	US
Kind code	A1
Filing date	Jul 9, 2019
Priority date	Aug 7, 2018
Publication date	Oct 14, 2021
Grant date	—

Abstract

Provided is a method of producing a composite having high strength and high thermal conductivity. The method includes: an alloy preparation step including preparing an alloy which is a solid solution containing α-Fe as a solvent and at least one type of α-phase stabilizing element as a solute; a first mixing step including mixing at least one type of α-phase stabilizing element in powder form and SiC to prepare a first mixture; a second mixing step including mixing the alloy and the first mixture to prepare a second mixture; and a sintering step including sintering the second mixture.

First claim

1 . A method of producing an α-Fe—SiC composite, comprising:
an alloy preparation step comprising preparing an alloy which is a solid solution containing α-Fe as a solvent and at least one type of α-phase stabilizing element as a solute;
a first mixing step comprising mixing at least one type of α-phase stabilizing element in powder form and SiC to prepare a first mixture;
a second mixing step comprising mixing the alloy and the first mixture to prepare a second mixture; and
a sintering step comprising sintering the second mixture.

2 . A method of producing an α-Fe—SiC composite, comprising:
an alloy preparation step comprising preparing an alloy which is a solid solution containing α-Fe as a solvent and at least one type of α-phase stabilizing element as a solute;
a third mixing step comprising mixing the alloy and at least one type of α-phase stabilizing element in powder form to prepare a third mixture;
a fourth mixing step comprising mixing the third mixture and SiC to prepare a fourth mixture; and
a sintering step comprising sintering the fourth mixture.

3 . The method as set forth in claim 1 , wherein the second mixture prepared in the second mixing step contains the at least one type of α-phase stabilizing element in an amount of not less than 5.0 at. % relative to Fe contained in the α-Fe—SiC composite.

4 . The method as set forth in claim 2 , wherein the third mixture prepared in the third mixing step contains the at least one type of α-phase stabilizing element in an amount of not less than 5.0 at. % relative to Fe contained in the α-Fe—SiC composite.

5 . The method as set forth in claim 1 , wherein the at least one type of α-phase stabilizing element is a carbide-forming element.

6 . The method as set forth in claim 5 , wherein the carbide-forming element is at least one selected from the group consisting of Ti, Nb, V, and Ta.

7 . The method as set forth in claim 1 ,
wherein, in the sintering step, sintering is carried out by spark plasma sintering.

8 . The method as set forth in claim 7 , wherein, during the spark plasma sintering, heating is stopped once a set sintering temperature has been reached, without maintaining the second mixture or the fourth mixture at the set sintering temperature.

9 . An α-Fe—SiC composite comprising:
an alloy which is a solid solution containing α-Fe as a solvent and at least one type of α-phase stabilizing element as a solute; and
SiC, wherein
a proportion by volume of the SiC to the alloy is not less than 1.0%, and
the SiC has an average particle size of 1 μm to 100 μm.

10 . The α-Fe—SiC composite as set forth in claim 9 , wherein the alloy contains the at least one type of α-phase stabilizing element in an amount that allows Fe in the alloy to be in α-phase in an austenitic temperature range.

11 . The α-Fe—SiC composite as set forth in claim 9 , wherein the at least one type of α-phase stabilizing element is Ti, Nb, V, or Ta.

Assignees

• Univ Hiroshima
• Y Tec Corp
• Keylex Corp
• Mazda Motor

Inventors

• Sugio Kenjiro
• Takahashi Takuya
• Sawada Hitoshi
• Sasaki Gen
• Matsugi Kazuhiro
• Choi Yongbum
• Xu Zhefeng
• Suetsugu Hajime
• Kondo Hiroki
• Manabe Hideki
• Yamane Kyotaro
• Hatakeyama Kenichi
• Kawasaki Keizo
• Itaoka Tsuyoshi
• Seno Shinsaku
• Tamura Yasushi
• Ino Ichirou
• Hirao Yoshihide

Classifications

• C22C38/00

  Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00) · CPC title

• C22C29/005

  comprising a particular metallic binder · CPC title

• C21D7/13

  by hot working · CPC title

• C22C33/0292

  with more than 5% preformed carbides, nitrides or borides · CPC title

• C22C38/02

  containing silicon · CPC title