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Journal of Advanced Ceramics

Keywords

ceramics, fibers, microstructure, thermal shock resistance, oxidation resistance

Abstract

ZrB2-SiC-Cf composites containing 20-50 vol% short carbon fibers were hot pressed at low sintering temperature (1450 ℃) using nanosized ZrB2 powders, in which the fiber degradation was effectively inhibited. The strain-to-failure values of such composites increased with increasing fiber content, and the value for the composite with 50 vol% Cf was even more than 3 times higher than that of the composite with 20 vol% Cf. Furthermore, the composite exhibited non-brittle fracture mode when the fiber content was above 30 vol%, and the thermal shock critical temperature difference of the composite with 30 vol% Cf was up to 727 ℃, revealing excellent thermal shock resistance of this composite. Additionally, ZrB2-SiC-Cf composites displayed good oxidation resistance when the fiber content was below 40 vol%, suggesting that this method provides a promising way for preparation of high-performance ZrB2-SiC-Cf composites at low temperature.

Publisher

Tsinghua University Press

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