Ablation of vacuum plasma sprayed TaC-based composite coatings
Ablation of vacuum plasma sprayed TaC-based composite coatings
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DOI：
10.1016/j.ceramint.2015.05.100
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发表时间：
2015-11
影响因子：
5.2
通讯作者：
Pu Hui;Y. Niu;Cui Hu;Guocheng Wang;H. Li;Yi Zeng;Xuebin Zheng
中科院分区：
文献类型：
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作者：
Pu Hui;Y. Niu;Cui Hu;Guocheng Wang;H. Li;Yi Zeng;Xuebin Zheng
为了提高TiC/C复合材料的耐烧蚀性能，采用真空等离子喷涂技术在碳化硅涂层的C/C复合材料表面制备了TaC-25%MoSi2和TaC-25%Vol%的碳化硅复合涂层。用扫描电子显微镜、能谱仪和X射线衍射仪分别对涂层的物相组成和微观结构进行了表征。用2000℃以上的等离子火焰对S 60℃的烧蚀性能进行了评价，并制备了TaC涂层作为对比。结果表明，MoSi2和碳化硅均匀分布在复合涂层中。烧蚀试验表明，在烧蚀过程中，TaC涂层被完全氧化，体积膨胀显著。生成的Ta2O5是多孔的，被气流吹走。在烧蚀过程中，TaC-MoSi2涂层的表层被氧化，由于MoO_3的蒸发，氧化层部分从底层剥离。该涂层的质量损失率为0.32%，比TaC涂层低68%，且具有良好的耐烧蚀性能。认为涂层表面形成较致密的Ta2O5-SiO2涂层，有利于提高涂层的抗氧化腐蚀性能和抗机械冲蚀性能。
TaC-25 vol%MoSi2and TaC-25 vol%SiC composite coatings were prepared by vacuum plasma spray on SiC coated C/C composites, aiming to improve their ablation resistance. The phase composition and microstructure of the coatings were characterized by scanning electron microscopy, energy dispersive spectrometry and X-ray diffraction, respectively. The ablation behavior of the coatings was evaluated by a plasma flame over 2000 °C for 60 s. TaC coating was also fabricated for comparison. The results showed that MoSi2and SiC uniformly distributed in the composite coatings. The ablation tests demonstrated that the TaC coating was totally oxidized during the ablation process with significant volume expansion. The formed Ta2O5was porous and blown away by the gas flow. The surface layer of the TaC–MoSi2coating was oxidized during ablation and the oxide layer was partially detached from the underneath layer due to the evaporation of MoO3. The TaC–SiC coating exhibited a low mass loss of 0.32%, 68% lower compared to the TaC coating, and exhibited excellent ablation resistance. It was thought that the comparatively dense Ta2O5–SiO2layer formed on the coating surface was beneficial for both the oxidation–corrosion and mechanical-erosion resistance.