Collectors made by evaporating Mo onto Nb substrates in a low partial pressure of oxygen were studied in a demountable, fixed-spacing, planar thermionic converter featuring a common polycrystalline W emitter and an oxygen detector, which can be used to measure the effective oxygen pressure. Two collectors with oxygen contents of 2100 and 550 ppm were investigated. At spacings of 0.5 to 0.55 mm, their performances were similar with emitter bare work functions of 5.55 and 5.45 eV respectively. These values suggest that the effective oxygen pressure in the gap was around 4×10 −5 Pa , while the oxygen detector indicated much lower values. Maximum electrode output power densities and calculated maximum electrode efficiencies at an emitter temperature of 1800 K were 9 W/cm2 and 17%.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Evaluation of oxygen-dispensing collectors for thermionics


    Beteiligte:
    Desplat, Jean-Louis (Autor:in) / Bragg, Mary J. (Herausgeber:in) / El-Genk, Mohamed S. (Herausgeber:in)

    Kongress:

    Space technology and applications international forum -1999 ; 1999 ; Albuquerque, New Mexico (USA)


    Erschienen in:

    AIP Conference Proceedings ; 458 , 1 ; 1452-1457


    Erscheinungsdatum :

    22.01.1999


    Format / Umfang :

    6 pages





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Evaluation of Oxygen-Dispensing Collectors for Thermionics

    Desplat, J.-L. / University of New Mexico; School of Engineering; Institute for Space and Nuclear Power Studies | British Library Conference Proceedings | 1999


    Evaluation of Two Types of Oxygen-Dispensing Collectors for Thermionics

    Desplat, Jean-Louis | SAE Technical Papers | 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