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Influence of Heat Treatment of Amorphous Ti- and B-Containing SiC-Based Fiber in Air on Microstructure and Strength
Jiangxi Chen, Baojie Zhang, Danni Xu, Zhaoju Yu, Guomei He
Abstract
The oxidative behavior of amorphous Ti- and B-containing SiC-based fiber exposed to air flowing at 1100 – 1300 °C for 2 – 300 min was investigated. The results showed that the strength of the SiC-based fiber slightly decreased when the fibers were exposed to air for 2 min at 1000 – 1300 °C. When the exposure time was lengthened to 300 min or the exposure temperature was increased from 1000 °C to 1300 °C, the strength of the SiC-based fiber did not change significantly. The morphology studies with SEM revealed that defects on the fiber surface were generated at the beginning of oxidation, while they were healed by the growth of a smooth oxide layer during further oxidation. This study showed that the amorphous Ti- and B-containing Si-C-O phase displayed better oxidation resistance than the well-known amorphous Si-C-O phase. Thus, the resulting SiC-based fiber is able to maintain its amorphous structure and its strength in air up to 1300 °C.
Keywords
SiC fiber, oxidation, strength, microstructure, amorphous
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