Effects of Al additions on Microstructure of Hot Pressed MoSi2

Abstract

Abstract: The effect of Al additions on the microstructure of hot pressed MoSi₂ was studied, and the concept of transition-gas-phase-sintering was proposed. The results indicate
that the SiO₂ phase on grain boundary is eliminated by the reaction of Al and SiO₂ while the Al₂O₃ particles are produced, and
the MoSi₂ lattice is changed because of the diffusion of Al atoms. Furthermore, the sintering is advanced because of the deformation of
MoSi₂ lattice and the disappearance of residual gas which is replaced by Al vapor in isolated pores, so porosity is reduced. The porosity
is the lowest when Al additive is 3.5 wt%.

Key words: aluminium, molybdenum disilicide, microstructure

CLC Number:

TQ163

LI Jian-Lin,JIANG Dong-Liang,TAN Shou-Hong. Effects of Al additions on Microstructure of Hot Pressed MoSi₂[J]. Journal of Inorganic Materials.

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Effects of Al additions on Microstructure of Hot Pressed MoSi₂

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