Effects of HfC nanowire amount on the microstructure and ablation resistance of CVD-HfC coating
Effects of HfC nanowire amount on the microstructure and ablation resistance of CVD-HfC coating
复制标题
HfC纳米线用量对CVD-HfC涂层微观结构和耐烧蚀性能的影响
DOI：
10.1016/j.ceramint.2018.03.183
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发表时间：
2018-07-01
影响因子：
5.2
通讯作者：
Tian, Song
中科院分区：
文献类型：
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作者：
Ren, Jincui;Zhang, Yulei;Tian, Song
为了提高碳/碳(C/C)复合材料HFC涂层的耐烧蚀性能，采用化学气相沉积(CVD)的方法在HFC涂层中加入不同比例的HFC纳米线。研究了HFC纳米线含量对CVD-HFC涂层组织结构和耐烧蚀性能的影响。结果表明，随着沉积时间的延长，HFC纳米线层变得更厚、更致密。HFC纳米线可以抑制HFC涂层中裂纹和层间间隙的形成。随着HFC纳米线含量的增加，HFC涂层厚度增加，孔隙率和粗糙度先减小后增加。烧蚀实验表明，HFC纳米线的加入可以有效地提高涂层的抗烧蚀性能，这可以归因于涂层样品表面温度的降低以及涂层在烧蚀过程中开裂和剥落的有效减缓。HFC纳米线沉积1h的HFC涂层组织致密，具有较好的抗烧蚀性能，烧蚀120s后，其质量烧蚀率和线烧蚀率分别为0.41 mg/S和-1.53mU/S。
To improve the ablation resistance of HfC coating for carbon/carbon (C/C) composites, various fractions of HfC nanowires were incorporated into the HfC coating by chemical vapor deposition (CVD). Effects of HfC nanowire amount on the microstructure and ablation resistance of the CVD-HfC coating were investigated. Results indicated that the HfC nanowire layer became thicker and denser with the deposition time extending. HfC nanowires could inhibit the formation of cracks and interlaminar gaps in the HfC coating. With the increase of HfC nanowire amount, the HfC coating became thicker, while its porosity and roughness firstly decreased and then increased Ablation tests indicated that the incorporation of HfC nanowires could effectively improve the ablation resistance of the HfC coating, which could be ascribed to the decreasing surface temperature of the coated samples and the effective alleviation of cracking and delamination of the coating during ablation. The HfC coating with HfC nanowires deposited for 1 h exhibited better ablation resistance owing to its compact microstructure, and its mass and linear ablation rates were only 0.41 mg/s and -1.53 mu/s after ablation for 120s.