Effects of ZrO₂ coating on the strength improvement of 2.5D SiC_f/SiO₂ composites

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• 作者：Qing Wang ; ^{wangqing0701@163.com" class="auth_mail" title="E-mail the corresponding author} ; Feng Cao ; Yang Xiang ; Zhi-hang Peng
• 关键词：Ceramics composites ; Coating ; Mechanical properties ; High-temperature
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：884-889
• 全文大小：1705 K

文摘

In this study, 2.5 dimensional KD-II silicon carbide fiber-reinforced silicon dioxide (2.5D (SiC_f/SiO₂)) ceramic matrix composites with zirconium dioxide (ZrO₂) coating were successfully fabricated by sol–gel process. Effects of ZrO₂ coating on the flexural strength of the composites were comprehensively investigated. Results showed that the flexural strength of the ZrO₂-coated SiC_f/SiO₂ composites was approximately twice that of composites without coating. Moreover, the strength of the composites tested at 1200 °C increased approximately by 12% than that of the samples tested at room temperature. Further, the oxidation behavior of the composites was also investigated at high temperatures corresponding to 1300 and 1500 °C, which showed an increase in the bonding strength between SiC fibers and SiO₂ matrix. The evolution of microstructure revealed that ZrO₂ coating led to an increase in the surface roughness of fibers owing to the effective bonding between fibers and matrix.