A typical automotive catalytic converter is constructed with a ceramic substrate and a steel shell. Due to a mismatch in coefficients of thermal expansion, the steel shell will expand away from the ceramic substrate at high temperatures. The gap between the substrate and shell is usually filled with a fiber composite material referred to as “mat.” Mat materials are compressed during assembly and must maintain an adequate pressure around the substrate under extreme temperature conditions.The container deformation measurement procedure is used to determine catalytic converter shell expansion during and after a period of hot catalytic converter operation. This procedure is useful in determining the potential physical durability of a catalytic converter system, and involves measuring converter shell expansion as a function of inlet temperature. A post-test dimensional measurement is used to determine permanent container deformation. Excessive expansion increases the gap between the converter shell and the substrate, and causes the mat to lose substrate holding pressure. A loss of holding pressure can lead to substrate slippage and accelerated mat degradation.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Container Deformation Procedure for Ceramic Monolith Catalytic Converters


    Additional title:

    Sae Technical Papers



    Conference:

    SAE 2000 World Congress ; 2000



    Publication date :

    2000-03-06




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Container deformation procedure for ceramic monolith catalytic converters

    Spreen,K.B. / Heimrich,M.J. / Hornback,L.R. et al. | Automotive engineering | 2000


    2000-01-0217 Container Deformation Procedure for Ceramic Monolith Catalytic Converters

    Spreen, K. B. / Heimrich, M. J. / Hornback, L. R. et al. | British Library Conference Proceedings | 2000


    The ceramic monolith in catalytic converter design

    Howitt,J. / Corning Glass Works | Automotive engineering | 1974



    Rib selection to ensure optimum monolith stresses in catalytic converters

    Verma,A. / General Motors,AC Rochester Div.,US | Automotive engineering | 1991