Directly heated cathode and method of making it
Abstract
Abstract Translated from French La cathode selon l'invention comporte un support (1) en graphite pyrolytique et un revêtement émissif (2) constitué d'un mélange de tungstène et d'oxyde de lanthane, le tungstène étant transformé dans sa partie superficielle (3) en hemicarbure de tungstène. L'invention s'applique notamment aux tubes haute fréquence du type triode, tétrode ou pentode. The cathode according to the invention comprises a support (1) in pyrolytic graphite and an emissive coating (2) consisting of a mixture of tungsten and lanthanum oxide, the tungsten being transformed in its surface part (3) into hemicarbide of tungsten. The invention applies in particular to high frequency tubes of the triode, tetrode or pentode type.
Inventors
- 👤 Guy Clerc
Bibliographic Details
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