The effects of metallic Si additions on the synthesis of β-SiC powders using a sol-gel method

Title
The effects of metallic Si additions on the synthesis of β-SiC powders using a sol-gel method
Authors
김규미조경선임대순박상환
Keywords
SiC; powder; synthesis; sol-gel; carbothermal
Issue Date
2010-06
Publisher
Journal of ceramic processing research
Citation
VOL 11, NO 3, 377-383
Abstract
Single phase β-SiC powders were synthesized using SiO2/C hybrid precursors with and without the addition of metallic Si powders. The SiO2/C hybrid precursors with various C/Si mole ratios (1.6-4.0) were prepared by a sol-gel process using tetraethyl orthosilicate and phenol resin as starting materials. Fine β-SiC powders were synthesized by the carbothermal reduction of the SiO2/C hybrid precursor with and without the addition of metallic Si powders in the temperature range between 1250 ℃-1800 ℃ under a vacuum atmosphere. Single phase β-SiC powders were obtained by the carbothermal reduction of the SiO2/C hybrid precursor with a C/Si mole ratio of 1.6 above 1600 ℃ under a vacuum atmosphere. It was found that the addition of metallic Si powders to the the SiO2/C hybrid precursor with excess carbon reduced the temperature for the synthesis of single phase β-SiC powders to as low as 1350 ℃. The particle sizes of synthesized â-SiC powders from the metallic Si powder added SiO2/C hybrid precursor with excess carbon were less than 1 μm, in which fine β-SiC powders appeared to be slightly aggregated.
URI
http://pubs.kist.re.kr/handle/201004/38933
ISSN
1229-9162
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE