한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제33권8호
  • /
  • Pages.921-927
  • /
  • 1996
  • /
  • 1229-7801(pISSN)
  • /
  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
권호 표지

상압소결 $\beta$-SiC에 있어서 표면부에서의 액상집중과 미세구조의 변화

Concentration of Liquid-phase in the Surface Region and Microstructural Change in Pressureless Sintered$\beta$-SiC

  • 이종국 (조선대학교 재료공학과) ;
  • 양권승 (조선대학교 재료공학과) ;
  • 김환 (서울대학교 무기재료공학과)
  • 발행 : 1996.08.01
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초록

The liquid-phase concentration from the interior to the surface region and its influence on the microstructural changes were investigated in pressureless sintered $\beta$-SiC Surface reaction-layer was formed by reaction of packing powder and volatile components on the surface during sintering which was induced the concentration of liquid-phase in the surface regions. The microstructural changes between the surface region and the interior were appeared in sintered specimen which was resulted from the difference of liquid-phase content during sintering. Microstructural changes were observd with the depth of about 250${\mu}{\textrm}{m}$ from he surface. The grain size and aspect ratio of SiC in the interior are larger than those in the surface region and the rate of transforma-tion of $\beta$-to $\alpha$-SiC during sintering is higher in the interior than that in the surface region.

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