The high temperature dynamic fatigue data for the catalyst support composition, EX-20, 400/6.8, are presented. These data indicate that the fatigue effects are more severe when the substrate temperature in the peripheral region is near 200°C. The major impact of high temperature fatigue is the slow degradation of substrate’s initial strength while in service. Such a degradation must be taken into account in designing the total converter package to meet life requirements. For the EX-20, 400/6.8 substrate, approximately 50% of its initial strength is available to withstand the combined stresses from mechanical, thermal, and vibrational loads in service. At temperatures well above 200°C, the available design strength can be as high as 65% of substrate’s initial strength. The fatigue theory, the measurement technique, and the application of fatigue data to long term durability of cordierite substrates are discussed.


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    Title :

    High Temperature Fatigue in Ceramic Honeycomb Catalyst Supports


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    1985 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1985



    Publication date :

    1985-10-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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