The Effects of Metallic Silicon on the Synthsis of β-SiC Powders by A Carbothermal Reduction Using SiO2-C Hybrid Precursor Fabricated by a Sol-gel Process
- The Effects of Metallic Silicon on the Synthsis of β-SiC Powders by A Carbothermal Reduction Using SiO2-C Hybrid Precursor Fabricated by a Sol-gel Process
- 조영철; 염미래; 윤성일; 조경선; 박상환
- Silicon carbide; SiC; Sol-gel process; Carbothermal reduction; Powder synthesis; synthesis; Powder
- Issue Date
- 한국세라믹학회지; Journal of the Korean Ceramic Society
- VOL 50, NO 6, 402-409
- The objective of this study was to develop a synthesis process for β-SiC powders to reduce the synthesis temperature and to control the particle size and to prevent particle agglomeration of the synthesized β-SiC powders. A phenol resin and TEOS were used as the starting materials for the carbon and Si sources, respectively. SiO2-C hybrid precursors with various C/Si mole ratios were fabricated using a conventional sol-gel process. β-SiC powders were synthesized by a carbothermal reduction process using SiO2-C hybrid precursors with various C/Si mole ratios (1.6 ~ 2.5) fabricated using a sol-gel process. In this study, the effects of excess carbon and the addition of Si powders to the SiO2-C hybrid precursor on the synthesis temperature and particle size of β-SiC were examined. It was found that the addition of metallic Si powders to the SiO2/C hybrid precursor with excess carbon reduced the synthesis temperature of the β-SiCpowders to as low as 1300 ℃. The synthesis temperature for β-SiC appeared to be reduced with an increase of the C/Si mole ratio in the SiO2-C hybrid precursor by a direct carburization reaction between Si and excess carbon.
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