Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Phase Relations and Microstructure of Comounds in the $Si_3N_4-Al_2O_3-SiO_2$ system at $1700^{\cire}C$

$Si_3N_4-Al_2O_3-SiO_2$계의 1,$700^{\circ}C$에서 생성하는 화합물의 상관계 및 미구조

  • Lee, Eey-Jong (Dept. of Ceraminc Eng., Seoul National University) ;
  • Kim, Hwan (Dept. of Ceraminc Eng., Seoul National University)
  • 이의종 (서울대 공대 요업과) ;
  • 김환 (서울대 공대 요업과)
  • Published : 1979.04.01
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Abstract

The phase relations and microstructure appeared at 1700℃ in a system of Si3N4-Al2O3-SiO2 were studied. The samples were pressurelessly sintered at 1700℃ for 1hr and reheated at 1600℃ for 1hr under nitrogen atmosphere. The compounds formed were identified by X-ray diffraction method and the microstrues were observed by SEM. The stable phases appeared in this system were X-phase, Si2ON2, β'-Si3N4 and Mullite. From the results of those experiments, it was concluded that the X-phase has very close composition to that proposed by G, K. Layden, Si3Al6O12N2. SEM photographs showed that Si2ON2 was a plate phase and X-phase was a rectagular plate phase.

Keywords

References

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