$\alpha$ to $\beta$ Phase Transformation of $\alpha$-Si3N4 Whisker

$\alpha$-질화규소 Whisker의 $\alpha$/$\beta$ 상변태

  • 박지연 (한국과학기술원 재료공학과) ;
  • 김종희 (한국과학기술원 재료공학과)
  • Published : 1988.05.01


The $\alpha$ to $\beta$ phase transformation of $\alpha$-Si3N4 whisker and related microstructural changes have been investigated. When only $\alpha$-Si3N4 whisker was heat treated in the range 1650~175$0^{\circ}C$, the $\alpha$ to $\beta$ phase transformation occured. In this case, it eas suggested that the oxygen content in $\alpha$-Si3N4 whisker affected the transformation behavior. Although $\alpha$-Si3N4 whisker with Si was heat treated under the same condition, however, the variation of $\beta$- fraction had a similar tendency with heat treating time. Therfore, it was considered that the oxygen content in $\alpha$-Si3N4 whisker affected the transformation behavior dominently rather than the content of added Si. The added $\beta$ phase did not affect the transformation behaviro of $\alpha$-Si3N4 whisker.



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