Ablation behavior and mechanism of SiCf/Cf/SiBCN ceramic composites with improved thermal shock resistance under oxyacetylene combustion flow
Ablation behavior and mechanism of SiCf/Cf/SiBCN ceramic composites with improved thermal shock resistance under oxyacetylene combustion flow
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DOI：
10.1016/j.ceramint.2015.03.144
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发表时间：
2015-08
影响因子：
5.2
通讯作者：
B. Liang;Zhihua Yang;Y. Li;Jingkun Yuan;D. Jia;Yu Zhou
中科院分区：
文献类型：
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作者：
B. Liang;Zhihua Yang;Y. Li;Jingkun Yuan;D. Jia;Yu Zhou
研究了SiCf/Cf/SiBCN陶瓷复合材料的烧蚀性能、烧蚀机理及热震行为。固体烧蚀产物主要是无定形SiO2和方英石。主要烧蚀机理包括纤维和陶瓷基体的氧化、B_2O_3（I）和SiO_2（I）的蒸发以及机械剥离。SiCf/Cf/SiBCN具有显著低的质量烧蚀速率和期望的线性烧蚀速率。SiC和碳纤维引起的裂纹偏转、纤维拔出和脱粘的组合改善了抗热震性，从而导致表面不存在宏观裂纹。
The ablation properties and mechanisms (under oxyacetylene combustion) together with thermal shock behavior of SiCf/Cf/SiBCN ceramic composites were investigated. The solid ablation products are primarily amorphous SiO2and cristobalite. The primary ablation mechanisms include fiber and ceramic matrix oxidation, evaporation of B2O3(l) and SiO2(l), and mechanical exfoliation. SiCf/Cf/SiBCN has a significantly low mass ablation rate and a desirable linear ablation rate. The combination of crack deflection caused by SiC and carbon fibers, fiber pull-out and debonding improves thermal shock resistance and thus leads to the absence of surface macrocracks.