Rapid heat treatment to improve the thermal shock resistance of ZrO2 coating for SiC coated carbon/carbon composites
| Autor: | Hejun Li, Ruimei Yuan, Jun-Ling Qu, Peng-Fei Zhang, Jiaping Zhang, Qiangang Fu |
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| Rok vydání: | 2016 |
| Předmět: |
Thermal shock
Materials science Reinforced carbon–carbon Treatment method 02 engineering and technology Surfaces and Interfaces General Chemistry Plasma engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Oxyacetylene torch Coating Rough surface Materials Chemistry Melting point engineering Composite material 0210 nano-technology |
| Zdroj: | Surface and Coatings Technology. 285:24-30 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2015.11.027 |
| Popis: | ZrO 2 coating was prepared on the surface of SiC coated C/C composites by supersonic plasma spraying. Some defects, such as voids and micro-cracks, were observed on the surface of ZrO 2 coating after plasma spraying. A novel heat treatment method conducted by oxyacetylene torch was proposed. Through adjusting the gas fluxes of O 2 and C 2 H 2 , heat treatment temperature can be attained to the melting point of ZrO 2 (about 2700 °C) rapidly, which was expected to eliminate the defects formed in the plasma spraying. Surface roughnesses of the ZrO 2 coating before and after heat treatment were 23.14 and 14.39 μm, respectively. Heat treatment smoothed the rough surface of the as-sprayed ZrO 2 coating and eliminated the defects (voids and micro-cracks) efficiently. After 8 thermal cycles from 2000 °C to room temperature under oxyacetylene torch, the ZrO 2 coating without heat treatment was peeled off with the exposure of needle-like carbon fibers. In contrast, the ZrO 2 coating with heat treatment was uniform and the coating thickness remaining unchanged. |
| Databáze: | OpenAIRE |
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