Effect of temperature gradient on the erosion behavior of SiC coating for carbon/carbon composites in a combustion environment |
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| Affiliation: | State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, China;State Key Laboratory of Solidification Processing, Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China;State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China;State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi’an 710072, China;State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;Science and Technology on Thermostructural Composite Materials Laboratory, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi''an, Shaanxi, 710072, PR China |
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| Abstract: | SiC coating with a thickness of 50–70 µm was prepared on the surface of C/C composites by in-situ reaction method. The SiC coated C/C composites were then tested in a wind tunnel where a temperature gradient from 200 to 1600 °C could be obtained to investigate their erosion behavior. The results of wind tunnel test indicated that the service life of C/C composites was prolonged from 0.5 to 44 h after applying the SiC coating. After the wind tunnel test, three typical oxidation morphologies, including glassy SiO2 layer, porous SiO2 layer and clusters of honeycomb-like SiO2 grains, were found on the SiC coated C/C composites. With the decrease of oxidation temperature, the amount of glassy SiO2 declined and the thermal stress increased, which induced the cracking followed by the degradation of the SiC coating. |
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| Keywords: | Temperature gradient SiC coating Oxidation behavior Mechanical property Wind tunnel |
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