Chemical propulsion systems are currently limited by materials issues. Until recently, the state-of-the-art material for liquid propellant combustion chambers was silicide-coated niobium. However, combustion chamber performance demands have exceeded the capabilities of this material system, requiring development of better materials. The iridium/rhenium combustion chamber, comprising a rhenium structural shell with an iridium inner liner for oxidation protection, represents the current state of the art in high-performance, high temperature, long-life propulsion systems using nitrogen tetroxide/monomethyl hydrazine propellant. However, oxygen/hydrogen ( O 2 /H 2 ) and new “green” monopropellants under development to replace hydrazine will be significantly more oxidizing at operating temperature. For these more highly aggressive combustion environments, Ultramet has shown that substantial additional life can be obtained by lining the interior of the combustion chamber with a refractory metal oxide, which functions as a thermal and gas diffusion barrier and provides dramatically increased oxidation resistance. Ultramet has fabricated numerous 22-N (5- lb f ) thrust chambers with this oxide-iridium/rhenium architecture that have been hot-fire tested at NASA Lewis Research Center in O 2 /H 2 propellant at mixture ratios of 6 and 16, with steady-state exterior wall temperatures ranging from 2433 to 2899 K, comprising the most severe temperature and oxidizing conditions ever utilized. Of the seven chambers tested to date, three failed due to facility problems, and two never failed. The best-performing chamber was hot-fired for 13,595 seconds (227 minutes; 3.8 hours) and showed no visible signs of degradation. Additional chambers are being fabricated for future testing.


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    Titel :

    The next step in chemical propulsion: Oxide-iridium/rhenium combustion chambers


    Beteiligte:
    Fortini, Arthur J. (Autor:in) / Tuffias, Robert H. (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 ; 691-696


    Erscheinungsdatum :

    22.01.1999


    Format / Umfang :

    6 pages





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    The Next Step in Chemical Propulsion: Oxide-Iridium/Rhenium Combustion Chambers

    Fortini, A. J. / Tuffias, R. H. / University of New Mexico; School of Engineering; Institute for Space and Nuclear Power Studies | British Library Conference Proceedings | 1999



    DESIGN, ANALYSIS, AND FABRICATION OF OXIDE-COATED IRIDIUM/RHENIUM COMBUSTION CHAMBERS

    Jang, Q. / Tuffias, R. H. / La Ferla, R. et al. | British Library Conference Proceedings | 1993


    Iridium/rhenium combustion chambers - From concept to reality

    Tuffias, R. / Kaplan, R. / Williams, B. et al. | AIAA | 1996


    Iridium/Rhenium Combustion Chambers: From Concept to Reality

    Tuffias, R. H. / Kaplan, R. B. / Williams, B. E. et al. | British Library Conference Proceedings | 1996