Estimation of Thermal Shock Strength for Porous Silicon Carbide

Abstract

Thermal shock fracture test using an infrared radiation heating (IRH) technique was performed on porous silicon carbide ceramics, which have various porosities (40-80vol%) and pore sizes (5-30 micrometer). Porous silicon carbide is used as DPF material. In an actual application, it is exposed in high thermal stress condition. And the heating-up time is not so fast. The effect of thermal conductivity should be considered in such condition. IRH method is appropriate method to consider that effect.The thermal shock strength, RSUB1c/SUB, of these materials were estimated experimentally and theoretically. It was possible to quantitatively evaluate the relationship between thermal shock resistance and microstructure of porous ceramics using RSUB1c/SUB. Thermal shock strength, RSUB1c/SUB, was decreased with the increase in porosity and pore size, and it was strongly dependent on the pore size.