Synthesis and Sinteirng of <TEX>$MoSi_2$</TEX> by SHS Process

,; ,; ,; ,; ,; ,; ,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 32(9); 1995 > Article

Journal of the Korean Ceramic Society 1995;32(9): 1085.

SHS법에 의한 고온발열체용 $MoSi_2$의 합성 및 소결

이승재, 장윤식, 김인술¹, 박홍채, 오기동

부산대학교 무기재료공학과
¹포항제철 기술연구소

Synthesis and Sinteirng of $MoSi_2$ by SHS Process

ABSTRACT

Molybdenum disilicide (MoSi2) was synthesized from Mo, MoO3, Si and Al powders by self-propagating high temperature synthesis (SHS). The effect of processing parameters such as Mo/MoO3 molar ratio, Ar gas pressure in the reactor and pressing pressure of compacts in synthesis of MoSi2 were investigated. h-MoSi2 was transformed into t-MoSi2 with increasing the Mo/MoO3 mole ratio, and only t-MoSi2 phase was identified above 3.5 : 1 (molar ratio). The synthesized phases did not change with the variation of Ar gas pressure and pressing pressure of compacts. It was found that the combustion temperature was above 2,50$0^{circ}C$. The products were separated into MoSi2 (s) and $alpha$-Al2O3 by the difference of their specific grativities. Bending strength, hardness and density of sintered specimen exhibited 82 MPa, 5.368 GPa and 5.43 g/㎤, respectively.

Key words: Molybdenum disilicide $(MoSi_2)$, Self-propagating high-temperature synthesis (SHS)