Phase Relations and Microstructure of Comounds in the <TEX>$Si_3N_4-Al_2O_3-SiO_2$</TEX> system at <TEX>$1700^{cire}C$</TEX>

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J. Korean Ceram. Soc. > Volume 16(4); 1979 > Article

Journal of the Korean Ceramic Society 1979;16(4): 206.

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

이의종, 김환

서울대 공대 요업과

Phase Relations and Microstructure of Comounds in the $Si_3N_4-Al_2O_3-SiO_2$ system at $1700^{cire}C$

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.