High voltage screening on ceramics parts with bimodal strength distribution

The effect of high voltage screening on ceramics parts composed of titania ceramics with relative densities of 60 and 90%, was examined. Before screening, strength distribution was clearly descriminated into two regions, high strength region and low strength region. The dielectric strength was measured on the low strength samples, and the electric field below which all of the low strength parts would break was estimated as a screening field. After electric screening, the mechanical strength was measured and compared with the original one. Ceramic parts composed of only high strength region were obtained by eliminating the low strength parts electrically.