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| Preparation of HfO2 Coatings on Cf/SiC Matrix Composites and Study of Its Thermal Shock Resistance |
| Received:January 31, 2016 Revised:June 15, 2016 |
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| DOI：10.7643/ issn.1672-9242.2016.03.004 |
| KeyWord:Cf/SiC matrix composites HfO2 coatings thermal shock resistance |
| Author | Institution |
| LAN Hao |
State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences,Beijing , China |
| ZHANG Wei-gang |
State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences,Beijing , China |
| HUANG Chuan-bing |
State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences,Beijing , China |
| FANG Shi-ge |
State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences,Beijing , China |
| WEI Xi |
State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences,Beijing , China |
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| Abstract: |
| Objective To study the phase constituent, microstructure and thermal shock resistance of plasma sprayed HfO2 coatings on Cf/SiC matrix composites. Methods HfO2 powders were fabricated via hydrothermal synthesis and spray-drying process. The HfO2 coatings were prepared on Cf/SiC matrix composites by plasma spraying. The phase constituent, microstructure and thermal shock resistance of the coatings were studied. Results The hydrothermal synthesized HfO2 particle exhibited monoclinic structure, and its average grain size ranged from 15 nm to 20 nm. Microcracks and holes were observed in the microstructure of plasma sprayed HfO2 coatings. And the phase constituent of the sprayed HfO2 coatings kept monoclinic structure at 1350 ℃. The sprayed HfO2 coatings exhibited an excellent bonding condition with the Cf/SiC substrate. No spallation was observed between the coatings and the substrate. Under condition of 1350℃ water cooling-heating impact, surface disbonding occurred in the HfO2 coatings after 20 thermal cycles, and more than 50% surface area of HfO2 coatings disbonded from the substrate after 27 thermal cycles. Conclusion The plasma sprayed HfO2 coatings exhibited an excellent bonding condition with the Cf/SiC substrate, and could resist 50 thermal cycles of 1350 ℃ air-cooling test without degradation and failure. In water-cooling test, the life of the coatings could reach 27 thermal cycles. |
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