Articles
  • The effects of metallic Si addtions on the synthesis of β-SiC powders using a sol-gel method 
  • Gyu-Mi Kima,b, Gyung-Sun Chob, Dea-Soon Lima and Sang-Whan Parkb,*
  • a Dept. of Material Science and Engineering, Korea Univ., Anam-dong 5-ga, Seongbuk-gu, Seoul, Korea b Materials Science & Technology Research Division, Korea Inst. of Sci. & Tech., Seoul, Korea
Abstract
Single phase beta-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 beta-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 degrees C-1800 degrees C under a vacuum atmosphere. Single phase beta-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 degrees C 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 beta-SiC powders to as low as 1350 degrees C. The particle sizes of synthesized beta-SiC powders from the metallic Si powder added SiO2/C hybrid precursor with excess carbon were less than 1 mu m, in which fine beta-SiC powders appeared to be slightly aggregated.

Keywords: Synthesis; SiC powder; Sol-gel; carbothermal

This Article

  • 2010; 11(3): 377-383

    Published on Jun 30, 2010

Correspondence to

  • E-mail: