Abstract
Under the high electric field, electric discharge sometimes occurs along the surface of solid in vacuum, gas or liquid dielectrics, which is called surface flashover. Contrary to the traditional insulator-alumina ceramics with high sintering temperature (1600°C), porosity, unworkability, brittleness and other disadvantages, the new glass ceramic (SiO2–B2O3–R2O–Li2O–Al2O3–ZnO–MgO–F) possesses both excellent machinability and great insulation strength. This paper tries to investigate the influence of ion-exchanged technique on flashover voltage. The results demonstrate that the 10h ion-exchanged glass ceramic shows the most prominent insulation strength. Based on the theory of SEEA (Secondary Electron Emission Avalanche), this phenomenon can be reasonably explained by the factors of electron conduction and surface roughness.
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