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Influence of preparation technology on the microstructure and anti-oxidation property of SiC-Al2O3-mullite multi-coatings for carbon/carbon composites |
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| Authors: | Jian-Feng Huang He-Jun Li Xin-Bo Xiong |
| Institution: | a C/C Composites Technology Research Center, Northwestern Polytechnical University, Xi’an, Shannxi 710072, PR China b School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xianyang, Shannxi 712081, PR China c Department of Materials Science, Shenzhen University, Shenzhen 518060, PR China |
| Abstract: | Oxidation protective SiC-Al2O3-mullite multi-coatings for carbon/carbon (C/C) composites were prepared with a two-step pack cementation process. The influence of preparation temperature and SiO2/Al2O3 ratio of the pack powder on the phase, microstructure and oxidation resistance of the multi-coatings were investigated. It showed that the multi-coatings that contained mullite could be produced at 1700-1800 °C. A denser coating surface was acquired with the decrease of SiO2/Al2O3 ratio in the pack chemistries while a little damnification to the interface of the coating and C/C substrate. The as-prepared coating could effectively protect C/C composites from oxidation at 1600 °C for 81 h. |
| Keywords: | Carbon/carbon composites Coating Oxidation Surface structure morphology roughness and topography X-ray scattering Diffraction Reflection Solid surfaces and solid interfaces |
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