Glazed ceramic article, metal and ceramic assembly having glazed ceramic article and vacuum switch having metal and ceramic assembly

摘要

A glazed ceramic article is provided which comprises a glaze layer formed on an outer surface of a ceramic main body. The glaze layer is made of a glaze comprising 60 to 74% by weight of Si when calculated in terms of SiO2 and 16 to 30% by weight of Al when calculated in terms of Al2O3. Such a composition can raise the softening temperature and can prevent deterioration of the appearance due to the surface roughening caused at the time of soldering of a metallic member to the ceramic main body after glost firing and deterioration of the insulation ability due to adherence of dirt to the surface of the glaze layer. A metal and ceramic assembly having such a glazed ceramic article, and a vacuum switch having such a metal and ceramic assembly are also provided.