Abstract
The sintering mechanism of recrystallized silicon carbide (RSiC) is mainly “the evaporation-condensation process” of silicon carbide. In the process of sintering, no liquid phase is generated and the samples almost do not shrink. After sintering, the pore connectivity of the specimens comes excellent, so the gas permeability of the RSiC porous ceramic supports is very good. The influences of SiC micro-powder content on the properties of the supports were investigated. Specifically, the open porosity, cold modulus of rupture, hot modulus of rupture at 1200°C, pore size distribution, and gas permeability of samples were measured. The microstructure and phase composition of samples were also analyzed by SEM and XRD. Our results show that RSiC porous ceramic supports with not-too-high apparent porosity but excellent permeability and mechanical properties at room and high temperature can be prepared by simply adjusting the amount of SiC micro-powder.
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