SE7408863L

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...

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Bibliographic Details
Main Authors BACHMANN R, GESSINGER G, BUXBAUM C
Format Patent
LanguageEnglish
Published 10.01.1975
Subjects
BASIC ELECTRIC ELEMENTS
BLASTING
DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
HEATING
LIGHTING
MECHANICAL ENGINEERING
OTHER DOMESTIC STOVES OR RANGES
RANGES
VENTILATING
WEAPONS
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Summary: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.
Bibliography:Application Number: SE19740008863