The Effect of Chromium Oxide Coatings on Surface Flashover of Alumina Spacers in Vacuum

作者：T. S. Sudarshan, J.D. Cross · 发表于：IEEE Transactions on Electrical Insulation · 年份：1976 · DOI：10.1109/tei.1976.297942 · 被引用次数：103 · 研究领域：High voltage insulation and dielectric phenomena、Electrostatic Discharge in Electronics、Vacuum and Plasma Arcs

An experimental investigation of the effect of chromium oxide coatings upon the surface flashover of high-density alumina in vacuum is reported. It is shown that such coatings improve the withstand voltage for dc, 60-Hz, and impulse voltages by significant amounts. The coatings are simply applied, effective, and durable. It is postulated that the improvement in insulation is due to the elimination of positive surface charging by the use of a coating with a secondary-electron emission coefficient less than unity for all incident electron energies.