Electron tube cathode

An electron tube cathode has a composite suppression layer structure interposed between the base metal and the electron-emitting material to suppress an interface layer formed through the reaction of the base metal with the electron emissive material. The composite layer structure includes a thin la...

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Bibliographische Detailangaben
Hauptverfasser: KAWAMURA, TAKAO, FUKUSHIMA, HIROSHI, MISUMI, AKIRA, DEGAWA, YOSHIO, AIDA, TOSHIYUKI, YUITO, ISAMU, YAMAMOTO, SHIGEHIKO, TAGUCHI, SADANORI, KAWABE, USHIO, HONDA, YUKIO
Format: Patent
Sprache:eng
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Zusammenfassung:An electron tube cathode has a composite suppression layer structure interposed between the base metal and the electron-emitting material to suppress an interface layer formed through the reaction of the base metal with the electron emissive material. The composite layer structure includes a thin layer of Pt or Re and a layer of oxide of Zr and/or Hf. As a result, the formation of the interface layer is prevented so that the useful life of the electron tube cathode is prolonged.