Oxidation resistant impregnated cathode

Electric lamp and discharge devices – Electrode and shield structures – Cathodes containing and/or coated with electron emissive...

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313337, H01J 1914, H01J 114

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active

048556378

ABSTRACT:
An impregnated cathode comprising a cathode obtained by impregnating pore portions of a refractory porous substrate with an electron emissive material containing Ba and formed thereon a plurality of thin films made of a high melting metal and Sc, or a high melting metal and a Sc oxide, or a high melting metal, Sc and a Sc oxide, or a high melting metal and a compound of Sc, W and O, said thin films having the same composition but different densities can maintain good emission characteristics even after the sealing off step of tube production because the thin films formed on the cathode surface are oxidation-resistant.

REFERENCES:
patent: 2912611 (1959-11-01), Beck et al.
patent: 4518890 (1985-05-01), Taguchi et al.
patent: 4626470 (1986-12-01), Yamamoto et al.
patent: 4737679 (1988-04-01), Yamamoto et al.

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