Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 33, Issue 10, Pages 1195-1202Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2016.11.010
Keywords
Carbon/carbon composites; Supersonic atmospheric plasma spraying; Protective coating; Ablation property
Funding
- National Natural Science Foundation of China [U1435202, 51521061]
- 111 Project [08040]
- Research Fund of the State Key Laboratory of Solidification Processing (Northwestern Polytechnical University), China [142-TZ-2016]
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To prevent the C/C composites from ablation, HfC-HfO2 protective coating was prepared by supersonic atmospheric plasma spraying. The morphology and microstructure of HfC-HfO2 coating were characterized by X-ray diffraction and scanning electron microscopy. The ablation resistance test was carried out by an oxyacetylene torch. The results show that the as-prepared coating is dense with little pinholes and crack free. The elements Hf, C and O were uniformly distributed in the cross-section. After ablation for different time, the mass ablation rate fluctuated along with the change of ablation time. The ablation process of the surface coating could be divided into rapid oxidation and solid state sintering stages. During ablation, an HfCxOy-HfO2 transitional layer was generated in the coating, which resulted from the active oxidation of HfC. After cooling, some microcracks were observed on the surface of coating, and the structure of cross-section was broken, which were due to the phase transition of HfO2. (C) 2016 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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