Two types of oxygenated collectors were tested against the same emitter, to evaluate their ability to provide stable, enhanced thermionic performance. These two types were: sublimed Mo oxide layers, and a Nb-O single crystal alloy. Initially, the Mo oxide layers provided excellent thermionic performance, but degradation occurred, latter associated with emitter material transport and condensation on the collectors. By contrast, when used in conjunction with an internal getter, the Nb-O alloy resulted in somewhat lower, but stable performance, after an activation process. This activation process was associated with changes in the surface chemistry.


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    Title :

    Evaluation of Two Types of Oxygen-Dispensing Collectors for Thermionics


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    34th Intersociety Energy Conversion Engineering Conference ; 1999



    Publication date :

    1999-08-02




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English


    Keywords :


    Evaluation of Oxygen-Dispensing Collectors for Thermionics

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    Evaluation of oxygen-dispensing collectors for thermionics

    Desplat, Jean-Louis | American Institute of Physics | 1999


    Thermionics

    Roland Breitwieser / Herman Schwartz | NTRS | 1966


    Plasma Thermionics

    Snyder, Nathan W. | AIAA | 1961


    Review of the Physics of Thermionics

    Snyder, Nathan W. | AIAA | 1961