To protect carbon/carbon (C/C) composites from oxidation at high temperature, a nano SiC–MoSi2 (SiC n –MoSi2) coating on SiC pre-coated C/C composites was prepared by hydrothermal electrophoretic deposition. The phase composition, surface and cross-section microstructures of the prepared SiC n –MoSi2 coating deposited with different MoSi2/SiC n mass ratio were characterized by X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS) and scanning electron microscopy (SEM). The influence of MoSi2 content in the hydrothermal electrophoretic deposition suspension on the phase composition, microstructure and high-temperature oxidation resistance of the multi-layer coatings were investigated. Results showed that the content of MoSi2 phase in the prepared coating increases with the increase of MoSi2 content in the suspension. The density and oxidation resistance of the SiCn-MoSi2 coating improve with the increase of MoSi2 mass content from 20 to 60 wt% in the deposition suspension. However, micro-cracks and micro-holes in the coating are found when deposited with 80 wt% MoSi2, and a decrease in oxidation resistance was also detected. The multi-layer coatings deposited with suspension of 60 wt% MoSi2 exhibited the best anti-oxidation ability, which can effectively protect C/C composites from oxidation in air at 1,873 K for 90 h with weight loss of 2.08%.
Research on Chemical Intermediates – Springer Journals
Published: Feb 2, 2011
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