期刊
SURFACE & COATINGS TECHNOLOGY
卷 206, 期 19-20, 页码 3883-3887出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2012.03.039
关键词
Carbon/carbon composites; Ablation resistance; HfC; HfSiO4; Oxidation
资金
- National Natural Science Foundation of China [51072166, 50902111]
- Program for New Century Excellent Talents in University
- 111 Project [B08040]
To improve the ablative resistance of carbon/carbon (C/C) composites, a SiC/HfC/SiC coating was prepared by a multi-step technique of diffusing reaction and chemical vapor deposition. The microstructure and morphology of the coatings were characterized by Scanning Electron Microscopy, X-ray diffraction. The coated C/C exhibits good ablation resistance. A compact glassy HfO2 layer was obtained on the coating surface after ablation, which can efficiently prevent C/C composites from ablation. Meanwhile, the outer SiC coating provides positive protection; Weight loss of the coated samples is only 2.3% after oxidation at 1500 degrees C for 66 h. HfSiO4 was formed during oxidation and characterized by a stable glassy phase which could protect C/C composites from oxidation. (c) 2012 Elsevier B.V. All rights reserved.
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