ALUMINA-CERAMIC-BASED ELECTRICAL INSULATOR, METHOD FOR PRODUCING THE INSULATOR, AND VACUUM TUBE COMPRISING THE INSULATOR

摘要

An alumina-ceramic-based electrical insulator, to a method for producing the insulator, and to a vacuum tube includes the insulator. The electrical insulator is for insulating two electrodes of a vacuum tube through which a charged particle beam flows, the electrical insulator being formed of an alumina-based ceramic. The ceramic comprises a vitreous phase of between 2% and 8% by weight into which at least one metal oxide is diffused from a face of the electrical insulator.