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Thermal damage and microstructure evolution mechanisms of Cf/SiBCN composites during plasma ablation
Corrosion Science ( IF 7.4 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.corsci.2020.108621
Qi Ding , Dewei Ni , Na Ni , Youlin Jiang , Bowen Chen , Xiaowu Chen , Jun Lu , Yaran Niu , Haijun Zhou , Shaoming Dong

Abstract Ablation behavior and thermal damage mechanisms of Cf/SiBCN composites were investigated in plasma ablation flame under a heat flux of 4.02 MW/m2, simulating a hypersonic service environment at ∼2200 °C. Oxide layer formed on the composites surface effectively protects internal Cf/SiBCN composites from further ablation. However, the internal Cf/SiBCN composites endure severe thermal damage and complex reactions, leading to decomposition of SiBCN matrix and formation of α/β-SiC, β-Si3N4 grains, amorphous C layer and ring-like SiC layer. Based on detailed microstructure and phase composition analysis, thermal damage and microstructure evolution mechanisms of Cf/SiBCN composites during plasma ablation are clarified.

中文翻译:

Cf/SiBCN复合材料在等离子体烧蚀过程中的热损伤和微观结构演化机制

摘要 在热通量为 4.02 MW/m2 的等离子体烧蚀火焰中研究了 Cf/SiBCN 复合材料的烧蚀行为和热损伤机制,模拟了 2200 °C 的高超声速服务环境。在复合材料表面形成的氧化层有效地保护内部 Cf/SiBCN 复合材料免受进一步烧蚀。然而,内部的 Cf/SiBCN 复合材料经受严重的热损伤和复杂的反应,导致 SiBCN 基体分解并形成 α/β-SiC、β-Si3N4 晶粒、非晶 C 层和环状 SiC 层。基于详细的微观结构和相组成分析,阐明了 Cf/SiBCN 复合材料在等离子体烧蚀过程中的热损伤和微观结构演化机制。
更新日期:2020-06-01
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