Effects of in situ amorphous graphite coating on ablation resistance of SiC fiber reinforced SiBCN ceramics in an oxyacetylene flame
Effects of in situ amorphous graphite coating on ablation resistance of SiC fiber reinforced SiBCN ceramics in an oxyacetylene flame
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DOI：
10.1016/j.corsci.2016.10.002
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发表时间：
2016-12-01
影响因子：
8.3
通讯作者：
Zhou, Yu
中科院分区：
文献类型：
--
作者：
Li, Daxin;Wu, Daoxiong;Zhou, Yu
研究了原位非晶石墨涂层对SiC纤维增强SiBCN陶瓷在氧乙炔火焰中烧蚀行为的影响。整体和复合材料的烧蚀产物相似，均由无定形SiO2和方石英组成。抗烧蚀性主要源于含有无定形SiO2的B2O3形成致密的钝化氧化层。在不同的烧蚀阶段，烧蚀速率受多种机制的协同控制。界面结构和SiC纤维的降解都会降低其抗烧蚀性能。碳化硅纤维的结晶导致强度降低是其性能较差的主要原因。(C) 2016 Elsevier Ltd.版权所有。
The effects of in situ amorphous graphite coating on ablation behavior of SiC fiber reinforced SiBCN ceramics in an oxyacetylene flame are explored. The ablation products for both the monoliths and composites are similar, comprising amorphous SiO2 and cristobalite. The ablation resistance stems from formation of dense, passivating oxide scale of B2O3 containing amorphous SiO2. In different ablation stages, the ablation rates are synergistically controlled by various mechanisms. Interfacial structure and degradation of SiC fibers both deteriorate ablation resistance. The crystallization of SiC fibers leading to strength reduction is the main reason for poorer performance vs monoliths. (C) 2016 Elsevier Ltd. All rights reserved.