The effects of metallic Si additions on the synthesis of β-SiC powders using a sol-gel method
- The effects of metallic Si additions on the synthesis of β-SiC powders using a sol-gel method
- 김규미; 조경선; 임대순; 박상환
- SiC; powder; synthesis; sol-gel; carbothermal
- Issue Date
- Journal of ceramic processing research
- VOL 11, NO 3, 377-383
- 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.
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