期刊
SURFACE & COATINGS TECHNOLOGY
卷 309, 期 -, 页码 545-553出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2016.12.010
关键词
Carbon/carbon composites; Multilayer coating; Carbide; Ablation
资金
- National Natural Science Foundation of China [51472203, 51521061, 51502245]
- 111 Project [B08040]
- Research Fund of State Key Laboratory of Solidification Processing (NWPU), China [142-TZ-2016]
This work proposes anew multilayer coating system containing ZrC-SiC, ZrC-LaB6, ZrC layer with respectively different functions to protect the carbon/carbon (C/C) composites. The coating system overcame the poor oxidation resistance of ZrC coating and weak anti-scouring performance of modified ZrC coating, which could provide the protection for C/C composites through the whole ablation process. After ablation for 40 s, the liner ablation rate of the multilayer coating was -2.89 +/- 30.23 mu m/s, decreased by 150.26%, 134.61% and 133.22% relative to the ZrC, ZrC-LaB6 and ZrC-SiC coating, respectively. The coating showed a weight gain, while all the other coatings lost weight after ablation. The good ablation resistance was mainly ascribed to different functions of these layers in the coating system. The ZrC-SiC layer provided oxidation protection during the initial ablation stage by forming a composite oxide of ZrO2-SiO2. In the intermediate stage, the ZrC-LaB6 layer promoted the formation of a stable scale containing (La0.1Zr0.9)O-1.95. As the ablation going on, a compact scale containing (La0.1Zr0.9)O-1.95 and La2Zr2O7 was formed, which further protected the composites. During ablation, the ZrC layer provided a foundation for the multilayer coating system against scouring. (C) 2016 Elsevier B.V. All rights reserved.
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