Long-term and cyclic ablation behavior of La2O3 modified Cf/ZrB2-SiC composites at 2500 ℃
Source abstract
Abstract
In this work, long-term and cyclic ablation behavior of the La 2O 3 modified C f/ZrB 2 -SiC composites were studied by air plasma torch at 2500 ℃. It is indicated that a micron-sized ZrO 2-La 2O 3-SiO 2 liquid phase layer forms on the ablation surface at 2500 ℃, which reduces the evaporation of SiO 2 and decreases the mass recession rates of the composites. However, the ZrO 2-La 2O 3-SiO 2 liquid phase layer exhibits poor structure stability. In addition, the La 2O 3 weakens the pinning effect of bulk ZrO 2 . Consequently, the oxide layer with low viscosity tends to sputter out due to the mechanical scouring by plasma flame. Therefore, the linear recession rates of the composites are increased during cyclic ablation with the increase of the La 2O 3 content.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · MXene and MAX Phase Materials
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