SiC POWDER, SiC SINTERED BODY, SiC SLURRY AND MANUFACTURING METHOD OF THE SAME

Patent metadata

Field	Value
Publication number	US-2017076835-A1
Application number	US-201615363147-A
Country	US
Kind code	A1
Filing date	Nov 29, 2016
Priority date	Jul 29, 2015
Publication date	Mar 16, 2017
Grant date	—

Abstract

A method of manufacturing a silicon carbide (SiC) sintered body and a SiC sintered body obtained by the method are provided. The method includes: preparing a composite powder by subjecting a SiC raw material and a sintering aid raw material to mechanical alloying; and sintering the composite powder, wherein the sintering aid is at least one selected from the group consisting of an Al—C-based material, an Al—B—C-based material, and a B—C-based material. Accordingly, a SiC sintered body that can be sintered at low temperature, can be densified, and has high strength and high electrical conductivity can be prepared.

First claim

What is claimed is:

1 . A silicon carbide (SiC) sintered body, comprising:
a sintering aid, wherein the sintering aid includes Al, and the SiC sintered body contains 0.97 to 4.38 wt % Al in grains thereof.

2 . The SiC sintered body of claim 1 , wherein the SiC sintered body further contains 0.1 wt % or more of B in the grains thereof.

3 . The SiC sintered body of claim 1 , wherein the SiC sintered body has a specific resistance of 1 to 10 −4 Ω·cm.

4 . A method of manufacturing a SiC sintered body, comprising:
preparing a composite powder by subjecting a SiC raw material and a sintering aid raw material to mechanical alloying; and sintering the composite powder, wherein the sintering aid is at least one selected from the group consisting of an Al—C-based material, an Al—B—C-based material, and a B—C-based material.

5 . A method of manufacturing a SiC sintered body, comprising:
preparing a SiC-based composite powder with a sintering aid distributed therein by subjecting Si, at least one selected from the group consisting of Al, B, and B 4 C, and a carbon source to mechanical alloying; and sintering the composite powder, wherein the sintering aid is at least one selected from the group consisting of an Al—C-based material, an Al—B—C-based material, and a B—C-based material.

6 . The method of claim 5 , wherein the sintering the composite powder, comprises sintering the composite powder at a temperature of 1550 to 2100° C.

7 . The method of claim 5 , wherein the content of the sintering aid is 2 to 13 wt %.

8 . A SiC slurry, comprising:
a SiC composite powder; and a dispersant, wherein the content of the dispersant is 0.5 to 2 wt % relative to 100 wt % of the SiC composite powder.

9 . The SiC slurry of claim 8 , wherein the dispersant is polyethyleneimine (PEI) or tetramethyl ammonium hydroxide (TMAH).

10 . The SiC slurry of claim 8 , wherein
the SiC composite powder comprises a sintering aid, and the sintering aid is at least one selected from the group consisting of an Al—C-based material, an Al—B—C-based material, and a B—C-based material.

11 . The SiC slurry of claim 10 , wherein the content of the sintering aid exceeds 0, but is not higher than 13 wt %, relative to 100 wt % of the SiC composite powder.

12 . A method of manufacturing a SiC slurry, comprising:
preparing a composite powder by subjecting a SiC raw material and a sintering aid raw material to mechanical alloying; and mixing a dispersion medium and a dispersant into the composite powder, wherein the sintering aid is at least one selected from the group consisting of an Al—C-based material, an Al—B—C-based material, and a B—C-based material.

13 . A method of manufacturing a SiC slurry, comprising:
preparing a SiC-based composite powder with a sintering aid distributed therein by subjecting Si, at least one selected from the group consisting of Al, B, and B 4 C, and a carbon source to mechanical alloying; and mixing a dispersion medium and a dispersant into the composite powder, wherein the sintering aid is at least one selected from the group consisting of an Al—C-based material, an Al—B—C-based material, and a B—C-based material.

14 . The method of claim 13 , wherein the mixing the dispersion medium and the dispersant into the composite powder, comprises mixing the composite powder, the dispersion medium, and the dispersant through agitation and performing ultrasonic dispersion to promote the dispersion of the dispersant.

15 . The method of claim 7 , further comprising, after the mixing the dispersion medium and the dispersant into the composite powder:
processing the composite powder with a ball mill or a planetary mill.

Assignees

• Korea Mach & Materials Inst

Inventors

• Lee Sea Hoon
• Yoon Bola
• Kim Jin Myung

Classifications

• C04B35/64

  Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F}) · CPC title

• C04B2235/3826

  Silicon carbides · CPC title

• C04B35/565

  based on silicon carbide · CPC title

• C04B2235/3834

  Beta silicon carbide · CPC title

• C04B35/645

  Pressure sintering · CPC title