Compositions – Electrically conductive or emissive compositions – Carbide containing
Patent
1979-11-06
1982-02-02
Barr, J. L.
Compositions
Electrically conductive or emissive compositions
Carbide containing
313346R, 252512, 252513, 252514, 252515, 252517, 252518, 252519, 252520, 252521, A01B 104
Patent
active
043138543
ABSTRACT:
An oxide-coated cathode for electron tubes comprising a base metal plate made of an alloy containing nickel as a major component and at least one high-melting point metal in an amount of 2% by weight or more, and if required, a small amount of one or more reducing elements, and an electron emissive alkaline earth metal oxide layer adhered to the base metal plate, characterized by having a carbide layer made of at least one carbide of Si, B, Ti, Zr, Hf, V, Nb, Ta, Mo or W between the base metal plate and the electron emissive alkaline earth metal oxide layer can maintain electron emitting life for a long period of time due to the prevention of interfacial reaction between the base metal layer and the alkaline earth metal oxide layer.
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Misumi Akira
Sunahara Kazuo
Barr J. L.
Hitachi , Ltd.
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