A ceramic has certain surface roughness, which can promote soiling.
By applying a glaze, the surface is smoothed. It improves many properties such as electrical behavior, mechanical strength and chemical resistance.
Ceramics are also glazed to increase the strength of the component through a compressive stress in the surface. At the same time, the smooth surface minimizes contamination and wetting by liquids. As a result, associated leakage currents are reduced.
Glazing is done in two steps. The glaze suspension is sprayed onto the alumina ceramic at Alumina Systems. After drying, the glaze is baked at about 1400 ° C. Since the glaze contracts more during cooling, like the ceramics, the desired compressive stresses develop on the surface.