材料科学
烧蚀
陶瓷
等离子体
放电等离子烧结
复合材料
剪切(物理)
分析化学(期刊)
色谱法
量子力学
物理
工程类
航空航天工程
化学
作者
Xiaojia Su,Baotong Hu,Yu Quan,Yanru Qin,Qingguo Feng,Chunfeng Hu
标识
DOI:10.1016/j.jeurceramsoc.2021.04.039
摘要
In this work, MoAlB samples for plasma exposure test were condensed by spark plasma sintering at 1200 °C for 10 min. Ablation resistance of MoAlB ceramic was investigated in a plasma torch facility for about 30 s at high temperature range of ∼1670−2550 °C, which provided a quasi-real hypersonic service environment. The results showed that the linear ablation rate was increased from 0 μm/s at ∼1670 °C to 86.4 μm/s at ∼2550 °C. At ∼1670 °C, the ablated surface of MoAlB ceramic was covered by Al2O3 layer, presenting excellent ablation resistance. At ∼2220 °C, the macroscopic cracks were induced by thermal stress, which opened up channels for the inward diffusion of oxygen and deteriorated the ablation resistance of the substrate. Above ∼2400 °C, the volatile MoO3 and B2O3 and the erosion of viscous oxides by the high shearing force of plasma stream were the main ablation mechanisms.
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