Long-time ablation protection of carbon/carbon composites with different-La2O3-content modified ZrC coating

被引：62
作者：
Jia, Yujun [1 ]
Li, Hejun [1 ]
Yao, Xiyuan [1 ]
Sun, Jiajia [1 ]
Zhao, Zhigang [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2018年 / 38卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Coating; Carbon/carbon composites; Lanthanum oxide; Long-time ablation; HIGH TEMPERATURE CERAMICS; CARBON-CARBON COMPOSITES; OXIDATION PROTECTION; C/C COMPOSITES; RESISTANCE; BEHAVIOR; SURFACE; PLASMA; PHASE; ZRB2;
D O I：
10.1016/j.jeurceramsoc.2017.09.050
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Long time oxidation protection at ultra-high temperatures or ablation protection has been a choke point for C/C composites. In this study, long time ablation protection of different-La2O3-content (5-30 vol.%) modified ZrC coating for SiC-coated carbon/carbon (C/C) composites was investigated. Results showed that ZrC coating with 15 vol.% La2O3 had good ablation resistance and could protect C/C composites for at least 700 s at 2160 degrees C. A high-thermal-stability and low-oxygen-diffusivity oxide scale containing m-ZrO2 particles and molten phases with La0.1Zr0.9O1.95 and La2Zr2O7 was formed during ablation, offering the ablation protection. La could erode grain boundaries of ZrO2 to refine ZrO2 by short-circuit diffusion and m-ZrO2 particles were retained due to less bulk diffusion than grain-boundary diffusion of La into ZrO2. The erosion resulted in the formation of molten phases containing fine nano-ZrO2, which served as viscous binder among m-ZrO2 particles and crack sealer for the oxide scale.
引用
收藏
页码：1046 / 1058
页数：13
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