Effect of Single Loading Time to the Cyclic Ablation of C/C-SiC-ZrC Composite.

Effect of Single Loading Time to the Cyclic Ablation of C/C-SiC-ZrC Composite.
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单次加载时间对C/C-SiC-ZrC复合材料循环烧蚀的影响

DOI:
10.3390/ma15197027
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发表时间:
2022-10-10
期刊:
Materials (Basel, Switzerland)
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为了了解单次加载时间对碳化物改性C/C复合材料循环烧蚀性能的影响,用等离子体在2600K、50 S、往复0.5(C0.5)和5 S(C5)下对C/C-SiCZRC复合材料进行了循环烧蚀试验。从C0.5到C5,复合材料表现出相似的负质量和上升的正线性烧蚀率。物相、微观形貌和表面温度分析表明,烧蚀样品表面部分氧化的SiCZRC涂层开裂并持续剥落。质量的增加是由于陶瓷保护了附近的碳不被完全氧化。5 S的单次加载时间越长,热化学反应和机械侵蚀越强烈,导致线损越大。
To understand the influence of single loading time on the cyclic ablation of carbide modified C/C composites, a C/C-SiC-ZrC composite was impacted by plasma at 2600 K for 50 s under reciprocating 0.5 (C0.5) and 5 s (C5), respectively. The composites displayed similar negative mass and rising positive linear ablation rates from C0.5 to C5. Phases, micro-morphologies, and surface temperature analysis suggested that the partially oxidized SiC-ZrC covering on the ablated sample cracked and was persistently peeled off. The mass gain resulted from the ceramic’s protection of the nearby carbon from complete oxidation. The longer single loading of 5 s caused strengthened thermal chemical reaction and mechanical erosion, which resulted in the bigger linear loss.
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