Response of Silicon Nitride Ceramics under High-enthalpy Plasma Flows
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2018年第4期
论文作者：管甲锁 成来飞 WANG Yaohui
文章页码：828 - 835
摘 要：Silicon nitride ceramics were prepared by means of a hot-press sintering method. The ablation behavior was studied by plasma wind tunnel tests. The data suggested that, under low heat flux and stagnation pressure conditions, the ablation process was controlled by the atomic oxidation of Si3N4, leading to the elimination of Si3N4. By contrast, the erosion was mainly produced by the decomposition of Si3N4 under high heat flux and stagnation pressure conditions. Under these conditions, a fraction of Si phase, formed upon decomposition of Si3N4, was volatilized. The remained Si had melted due to high temperatures and scoured away from stagnation point area, generating mushroom-shaped samples.
管甲锁1，成来飞1，WANG Yaohui1,2
1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University2. Inner Mongolia Synthetic Chemical Engineering Institute
摘 要：Silicon nitride ceramics were prepared by means of a hot-press sintering method. The ablation behavior was studied by plasma wind tunnel tests. The data suggested that, under low heat flux and stagnation pressure conditions, the ablation process was controlled by the atomic oxidation of Si3N4, leading to the elimination of Si3N4. By contrast, the erosion was mainly produced by the decomposition of Si3N4 under high heat flux and stagnation pressure conditions. Under these conditions, a fraction of Si phase, formed upon decomposition of Si3N4, was volatilized. The remained Si had melted due to high temperatures and scoured away from stagnation point area, generating mushroom-shaped samples.
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