ELECTROPHORETIC AND ELECTROLYTIC DEPOSITION OF CERAMIC COATINGS ON CARBON-FIBERS

Alumina, zirconia, titania, lead zirconate titanate, hydroxyapatite an d chemically bonded ceramics in the system CaO-SiO2-P2O5 were deposite d via electrophoretic or/and electrolytic deposition methods on indivi dual carbon fibers, bundles and felts, which served as cathodic substr ates. Experimental conditions were determined for formation of uniform deposits of controlled thickness. After burning out of carbon fibers the corresponding ceramic replicas can be obtained. The possibility to form multilayer alumina/zirconia hollow fibers with sharp interfaces between alumina and zirconia layers has been demonstrated. Obtained co atings and fibers were studied by SEM. Experimental results obtained b y electrophoretic and electrolytic deposition methods were compared. ( C) 1998 Elsevier Science Limited. All rights reserved.