Article ID Journal Published Year Pages File Type
1459486 Ceramics International 2016 7 Pages PDF
Abstract

SiC refractories with in situ SiC whiskers as the bonding phase were produced by carbonization at 1500 °C. The effects of atmospheric heat treatment and the Si content on the hot strength of the SiC refractories were studied. The pressed samples were cured at 180 °C for 8 h and fired at 1500 °C for 6 h in coke, anthracite, or a graphite bed. Characterization of the samples by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy showed that the β-SiC whiskers were formed in situ through the vapor–solid mechanism. The interfacial bonding was strengthened by the interconnected structure. The coke or anthracite, whose reactivity is higher than that of graphite, accelerated the formation of thick β-SiC whiskers. The hot strength was improved by up to 59.33 MPa at 1400 °C in the sample containing 16 wt% silicon.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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