Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 182, Issue -, Pages 49-61Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2016.07.004
Keywords
Surfaces; Carbides; Coatings; Oxidation; Thermal properties
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A C/SiC-SiCnano functionally gradient coating was prepared on graphite by reactive melt infiltration (RMI) at 1873 K under argon atmosphere. The phase composition, microstructure, isothermal oxidation behavior and thermal shock resistance of the coatings were investigated. The results showed the presence of alpha-SiC and beta-SiC phases as well as a little amount of Si in the coating. The addition of SiC nanoparticles resulted in surface continuity improvement and increase transition interface thickness. Isothermal oxidation test was performed at 1773 K for 10 h in air. Results showed with increasing the SiC nanoparticles content the weight loss of the samples dropped from 48.72% to 5.03%. Despite the results of the isothermal oxidation test, the samples without SiC nanoparticles exhibited the minimum weight loss after thermal cycling oxidation between 1773 K and room temperature for 14 times due to the formation of SiC whiskers. (C) 2016 Elsevier B.V. All rights reserved.
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