| 摘要 |
An oxide-coated cathode for electron tubes which comprises a base metal plate made of an alloy comprising nickel as a main component and 2% by weight or more of at least one high-melting point metal, an oxide layer coated on the base metal plate comprising at least one oxide of a reducing element, a carbon coating layer coated on the oxide layer, and an alkaline earth oxide layer capable of emitting electrons coated on the carbon coating layer can maintain electron emitting life for a long period of time due to the prevention of interfacial reaction between the base metal plate and the alkaline earth oxide layer by the oxide layer and the carbon coating layer. |
