Hydrothermal Electrophoretic Deposition of Yttrium Silicates Coating on SiC-C/C Composites
Yttrium silicates coatings were deposited on SiC-C/C composites surface by a hydrothermal electrophoretic process using yttrium silicates nano-crystallites, isopropanol and siodine as source materials, solvent and charging agent, respectively. The yttrium silicates nano-crystallites were preprepared by a sonochemical process. The influence of deposition temperatures on the microstructures and crystallization of the yttrium silicates coatings were investigated. Surface and cross-section microstructures of the as-prepared multi-coatings were characterized by XRD and SEM. Results show that the coatings are composed by yttrium silicates crystallites with the main phase of Y2Si2O7 and a little Y2SiO5. The thickness and the density of the yttrium silicates coatings increases with the increase of deposition temperatures; and the coating process has little influence on the phase compositions of the coatings.
Wei Pan and Jianghong Gong
Y. T. Zhang et al., "Hydrothermal Electrophoretic Deposition of Yttrium Silicates Coating on SiC-C/C Composites", Key Engineering Materials, Vols. 368-372, pp. 1291-1293, 2008