SiO2 -glass bulb with at least one current lead-in, process for producing a gas-tight connection between them, and their use in a gas-discharge lamp

摘要

An SiO2-glass bulb with at least one current lead-in made of a gas-tight composite material, such that the composite material consists of a noble metal with a melting point >1,700° C. and SiO2 and is at least partially coated with a layer of SiO2. The noble metal and the SiO2 are homogeneously distributed in the composite material. The noble metal content of the composite material is >=10 vol. % to <=50 vol. %, and the SiO2 coating covers the composite material at least in the region of the connection with the SiO2-glass bulb.