Ultra-high temperature ablation behavior of CVD-Hf5TaC6 solid solution ceramic coating for C/C composites: Experiment and first-principle calculation

Hui Chen, Yulei Zhang, Zhenglong Li, Kang Shuai, Yanqin Fu, Jiachen Meng, Kun Liu, Jian Zhang, Tao Li

科研成果: 期刊稿件文章同行评审

15 引用 (Scopus)

摘要

To address the problem that the oxidized layer of HfC coating was loose and porous, HfxTayCx+y solid solution with good thermal stability and ablation resistance was proposed as coating for carbon/carbon (C/C) composites. In present work, HfC, TaC and the novel Hf5TaC6 solid solution coatings were synthesized on C/C composites by chemical vapor deposition. Combing with the ablation test and density functional theory calculations about oxygen-adsorption energies, the ablation mechanism of HfC, TaC and Hf5TaC6 solid solution coatings were investigated. The Hf5TaC6 solid solution coating showed superior ablation resistance than that of HfC and TaC coatings, benefitting from the solid-liquid composite oxide layer with HfO2 and Hf6Ta2O17 as solid structure to further stabilize the oxides and resist mechanical erosion, Ta2O5 as the liquid filler to heal cracks to inhibit the oxygen infiltration.

源语言英语
文章编号171486
期刊Journal of Alloys and Compounds
965
DOI
出版状态已出版 - 25 11月 2023

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