Microstructure evolution of SiC-ZrB2-ZrC coating on C/C composites at 1773 K under different oxygen partial pressures

Lu Li, Hejun Li, Xuemin Yin, Hongjiao Lin, Qingliang Shen, Xiyuan Yao, Tao Feng, Qiangang Fu

科研成果: 期刊稿件文章同行评审

18 引用 (Scopus)

摘要

The oxidation behavior of SiC-ZrB2-ZrC coating on C/C composites was investigated, basing on the microstructure evolution of oxide scale under different oxygen partial pressures at 1773 K. Similar experiments were conducted in SiC coatings, ZrB2and ZrC ceramic sheets for comparison. The multiphase coating showed the better oxidation resistance at a higher oxygen partial pressure, and its mass change was 1.34% after isothermal oxidation for 6 h at an oxygen partial pressure of 80,000 Pa. With the increase of the oxygen partial pressure, ZrO2particles with fibrous denticles were replaced by the aggregations of ZrO2particles and more SiO2glass was formed in a short time. The formed SiO2glass could effectively heal the microcracks of oxide scale. Moreover, the ZrB2and ZrC phases played an important role in deflecting cracks and restraining the propagation of cracks during oxidation. As the oxygen partial pressure increased, the oxide scale of SiC-ZrB2-ZrC coating became denser, presenting a two-layered structure composed of a SiO2layer and a Si-O-Zr layer at the elevated oxygen partial pressure.

源语言英语
页(从-至)470-479
页数10
期刊Journal of Alloys and Compounds
687
DOI
出版状态已出版 - 2016

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