Method for manufacturing αFe—SiC composite material, and αFe—SiC composite material

Patent metadata

Field	Value
Publication number	US-12064814-B2
Application number	US-201917266371-A
Country	US
Kind code	B2
Filing date	Jul 9, 2019
Priority date	Aug 7, 2018
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

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

The invention claimed is:

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, the second mixture prepared in the second mixing step containing the at least one type of α-phase stabilizing element in an amount of not less than 15.0 at. % and not more than 20 at. % relative to Fe contained in the α-Fe—SiC composite, the second mixture containing, as at least part of the at least one type of α-phase stabilizing element, Ti in an amount of not less than 8.0 at. % relative to Fe contained in the α-Fe—SiC composite; and
a sintering step comprising sintering the second mixture.

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

3. The method as set forth in claim 2 , wherein the carbide-forming element is at least one selected from the group consisting of Ti, Nb, V, and Ta.

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

5. The method as set forth in claim 4 , 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.

6. The method as set forth in claim 1 , wherein in the second mixing step, the alloy and the first mixture are mixed with use of a ball mill.

7. The method as set forth in claim 1 , wherein the at least one type of α-phase stabilizing element is Ti and at least one kind selected from the group consisting of Nb, V, and 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

• C22C38/02

  containing silicon · CPC title

• C22C33/02

  by powder metallurgy · CPC title

• C21D2211/001

  Austenite · CPC title

• C21D7/13

  by hot working · CPC title

• C21D6/008

  containing Si · CPC title