Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effects of Coating Conditions on the Thickness and Morphology of Alumina- or Carbon-Coated Layers on SiC Whiskers

알루미나 또는 카본 코팅 SiC 휘스커의 코팅층 두께 및 형상에 미치는 코팅조건의 영향

  • 배인경 (인하대학교 무기재료공학과) ;
  • 장병국 (한국에너지 기술연구소) ;
  • 조원승 (인하대학교 무기재료공학과) ;
  • 최상욱 (인하대학교 무기재료공학과)
  • Published : 1999.05.01
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Abstract

Alumina-coated SiC whiskers wee prepared by the calcination (1150$^{\circ}C$, 1h, Ar) of the alumina hydrate layer which was precipitated homogeneously on whisker surface from a solution of Al2(SO4)3 and urea as a precipitant. In addition carbon coated SiC whiskers were prepared by the pyrolysis (1000$^{\circ}C$, 4h Ar) of phenolic resin coated whisker. The effects of coating conditions on the thickness and morphology of the coated layers were examined by SEM and TEM. It was found that Al2O3-coating layers become thinner and more uniform with decreasing the Al2(SO4)3 concentration. Thin (0.075-0.1$\mu\textrm{m}$) and uniformly alumina-coating layers were obtained at the Al2(SO4)3 concentration 0.010mol/l. On the other han carbon-coating layers were uniform but very thin (5-16 nm) in thickness. For thicker carbon-coating layers ethanol as a disperse medium was found to be more efficient compared tousing acetone.

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References

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