Microstructure and Mechanical Properties of SiCw/BAS Glass-Ceramic Composites

Abstract

Abstract: The BAS glass-ceramic composites reinforced with different volume fractions of SiC whiskers were
successfully studied by a hot-pressing method. The results show that the BAS matrix is composed of BaAl₂Si₂O₈ and mullite. The incorporation of
SiC whiskers can significantly increase the flexural strength and fracture toughness of BAS glass-ceramics. The flexural strength
and fracture strength of 30vol%SiC_w/BAS composites can increase 128% and 190% compared to the unreinforced BAS matrix. The main toughening mechanisms are crack deflection, whisker pullout
and bridging. The results of TEM observations show that SiC whiskers are directly bonded to the BAS matrix grains with no interfacial glass
layer or reaction layer. In addition, the BAS composites also have good elevated temperature mechanical properties.

Key words: BAS glass-ceramic, SiC whisker, microstructure, mechanical properties

CLC Number:

TQ174

YE Feng,ZHOU Yu,LEI Ting-Quan,YANG Jue-Ming,ZHANG Li-Tong. Microstructure and Mechanical Properties of SiC_w/BAS Glass-Ceramic Composites[J]. Journal of Inorganic Materials.

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Microstructure and Mechanical Properties of SiC_w/BAS Glass-Ceramic Composites

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