Cathode impregnated by an electron emissive substance comprising

Details Cathode impregnated by an electron emissive substance comprising Cathode impregnated by an electron emissive substance comprising

1992-09-18

1994-04-26

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

313346DC, H01J 904

Patent

active

053061896

ABSTRACT:
An impregnated cathode including an electron emissive substance in a porous matrix of a metal having a high melting point and a heat resistive property, is manufactured by mixing (S2) powder of the metal and the electron emissive substance in a dry state into cathode forming powder, press-shaping (S3) the cathode forming powder into a shaped body, sealing (S4) the shaped body in a reaction vessel to provide a sealed vessel, and subjecting (S5) the shaped body in the sealed vessel to a hot isostatic press (HIP) to provide a sintered body of the cathode forming powder, wherein the substance comprises a barium aluminate compound represented by a chemical formula of:

REFERENCES:
patent: 3358178 (1967-12-01), Figner et al.
patent: 4165473 (1979-08-01), Falce
patent: 5096450 (1992-03-01), Sugimura et al.

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