Abstract
Porous silicon oxycarbide ceramics were fabricated by pyrolysis of silicone resin filled with cured polysiloxane powders. Silicone resin content has great effects on pore structure and flexural strength of porous ceramics. Higher silicone resin content leads to higher linear shrinkage, fracture strength and average pore size and lower open porosity. Heating rate during pyrolysis has indiscernible effects on open porosity and fracture strength. However, average pore size is affected, to a great extent, by heating rate. When a fast pyrolysis rate was employed, large pores are obtained. The fracture surfaces of porous ceramics were observed.
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