Isostatic Strength of Extruded Honeycomb Ceramics

Suresh  Gulati, Corning Incorporated, S & T

Isostatic strength plays an important role in mechanical reliability of both the automotive substrates and diesel filters. This presentation will describe the test methods for measuring both 3D and 2D isostatic strengths. It will also relate the isostatic strength to cell shape, cell dimensions, skin thickness, structural stiffness and material strength. In this manner the predicted strength can be compared with measured strength. Once the isostatic strength model is verified by measured values, it can then be used to optimize honeycomb structure from strength point of view. However, other requirements such as heat capacity, thermal shock resistance and pressure drop must also be considered simultaneously. The trade-offs associated with such an optimization will be discussed.