Formation of hollow fibers by electrophoretic deposition

Submicron alumina and zirconia powders were electrophoretically deposited on carbon fibers. Deposit thickness was evaluated for several deposition durations and the obtained results were further utilized for formation of alumina/zirconia laminates of controlled layer thickness. After burning out the carbon core the obtained hollow ceramic fibers were sintered. SEM observations revealed circular uniform cross-sections of the fibers. Laminated fibers showed sharp interfaces between alumina and zirconia layers. It was established that the propagating crack can be deflected at the interface between consecutive layers.