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

被引：12

作者：

Chen, Hui ^{[1
]}

Zhang, Yulei ^{[1
,2
]}

Li, Zhenglong ^{[1
]}

Shuai, Kang ^{[1
]}

Fu, Yanqin ^{[2
]}

Meng, Jiachen ^{[1
]}

Liu, Kun ^{[1
]}

Zhang, Jian ^{[1
]}

Li, Tao ^{[2
]}

机构：

[1] Northwestern Polytech Univ, Shaanxi Key Lab Fiber Reinforced Light Composite M, Xian 710072, Peoples R China

[2] Henan Acad Sci, Inst Carbon Matrix Composites, Henan Key Lab High Performance Carbon Fiber Reinfo, Zhengzhou 450046, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2023年 / 965卷

基金：

中国国家自然科学基金;

关键词：

C; C composites; Hf 5 TaC 6 solid solution coating; Density functional theory; Oxygen adsorption; Ablation resistance; HAFNIUM CARBIDE; OXIDATION; TANTALUM; PHASE;

D O I：

10.1016/j.jallcom.2023.171486

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

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.

引用

页数：11

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