Lanthanated thermionic cathodes

Details Lanthanated thermionic cathodes Lanthanated thermionic cathodes

1974-07-08

1978-04-11

Padgett, Benjamin R.

Compositions

Electrically conductive or emissive compositions

Elemental carbon containing

252503, 252515, 252516, 313346R, 313346DC, 252504, H01B 106

Patent

active

040838110

ABSTRACT:
A thermionic cathode of tungsten or molybdenum is made with an activating content of lanthanum oxide and is supplied with a carbonaceous reducing agent either by incorporation in the bulk material of the cathode body or by carburizing, so that the reducing agent comprises at least in part a carbide of the carrier metal. Lower operating temperatures and higher emissivity are obtained compared to thoriated tungsten filaments and longer useful life compared to other cathodes activated by other rare earth oxides. The temperature-emissivity characteristics are such that good results are obtainable even within the temperature range in which molybdenum is usable as a carrier material.

REFERENCES:
patent: 2438732 (1948-03-01), Williams
Metals and Materials, vol. 1, 1967, Albert., No. 2, p. 44.
C. W. Horsting Journal of Applied Physics, vol. 18, pp. 95-102.

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