A cold cathode for a gas discharge tube with an alkaline earth metal layer on a metallic support

摘要

The electrode (1) in its entirety, forming a cold cathode tube (2) to discharge in a gas, comprises a support (3) and ferrous metal, coated with an active layer (4) on its inner face (3a). The support (3) is inserted into a tubular sheath (5) made of ceramic, which exceeds the support of the side of the discharge. The active layer (4) is made of metal, alkaline-earth - earth metal titanate baked (barium and / or calcium) containing a reducing agent such as silicon, zirconium and aluminum in the dose of 10 - 6 to 10 - 8 mole per mole of titanate reducer element. During the curing of the layer (4) at a temperature between 750degré 000degré and 1 c, it is assumed that the products of reduction of the dopants titanate form in order to lower and regulate the output voltage.