α-Sialon/SiC(w) Composites Sintered in Different Atmosphere

Abstract

Abstract: The microstructures of two α-Sialon/SiC_(w) composites sintered in N₂ and N₂+CO atmosphere respectively, were studied by using TEM, HREM and EDS.
TEM observations revealed quite different interface stuctures in-between those two composites. A strong interfacial bond between α-Sialon matrix and
SiC whisker was observed in the composite sintered in N₂, while for the composite prepared in N₂+CO, a thick layer of glass was found to be formed at the matrix/whisker
interface. The glass was produced by the reaction between CO gas and the SiC whisker surface. Albeit different interface structures, both composites decreased mechanical
properties because the cracks progressed directly across the whisker rather than circumferentially. Possible processes were proposed in order to improve the mechanical
properties of SiC whisker reinforced α-Sialon composites by tailoring the interface microstructures of the composite.

Key words: SiC whisker, sintering atmosphere, composites, interfaces

CLC Number:

TB323

XU Fang-Fang,WEN Shu-Lin,NORDBERG L-O. α-Sialon/SiC_(w) Composites Sintered in Different Atmosphere[J]. Journal of Inorganic Materials.

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α-Sialon/SiC_(w) Composites Sintered in Different Atmosphere

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