Abstract
Ceramic fibers and whiskers have been used for modification of toughness because they increase fracture energy due to their high elastic modulus and strength. The mechanism of this increase is well known to be pull-out, crack deflection and a bridging mechanism. This study focused on the increase in toughness, strength and thermal shock resistance when using ceramic fibers in a gas filter for high temperatures. The basic systems studied were clay bonded SiC-mullite and Al 2O 3-mullite with carbon black (to improve filtering efficiency). The Al 2O 3-mullite system showed lower porosity (2745%) and higher strength (131 kg/cm 2) than the same system fired in air. The strength was higher than for the SiC-mullite system with the same treatment because of the high sintering rate. Also, the hot strength at 1000 °C was higher than for the SiC-mullite system. Strength degradation was only 14% and 5% after thermal shock tests. Resistance to thermal shock was better than the Al 2O 3-mullite system owing to better thermal shock resistant raw materials (like SiC) and the fibrous microstructure. Both systems fired in air showed broader pore size distributions than when fired in a coke bed.
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