This paper examines the relative thermal shock requirements for ceramic catalysts in underbody vs. close-coupled positions. The higher operating temperature in the latter position may imply higher coefficient of thermal expansion and higher thermal stresses, depending on substrate/washcoat interaction, than those for underbody position. An analysis of thermal stresses, using relevant physical properties and temperature gradients, is presented for both close-coupled and underbody catalysts. Three different high temperature close-coupled catalysts, employing advanced ceramic substrates with 600/3, 600/4 and 900/2 cell structure, and an underbody catalyst with 400/6.5 standard ceramic substrate are examined. Such an analysis is valuable for designing the optimum aspect ratio (length/diameter) and packaging system, which will minimize thermal and mechanical stresses over the desired lifetime of 120K vehicle miles. The analysis shows that the recommended aspect ratio for close-coupled application may be different from that for underbody application depending on operating conditions and the packaging design.


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    Titel :

    Thermal Shock Resistance of Advanced Ceramic Catalysts for Close-Coupled Application


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Lambert, D. W. (Autor:in) / Hampton, L. E. (Autor:in) / Gulati*, S.T. (Autor:in)

    Kongress:

    SAE 2002 World Congress & Exhibition ; 2002



    Erscheinungsdatum :

    2002-03-04




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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