Abstract：The porous SiC scaffolds were prepared by freeze casting, and then the porous scaffolds were impregnated and cracked by liquid polycarbosilane (LPVCS) to prepared SiC ceramics. The effects of the number of immersion cracking cycles on the density, porosity, microstructure and bending strength of SiC flexural were studied. The results show that, the porous SiC scaffolds formed by freeze casting are oriented porous dendrites. The density, porosity and flexural strength of the scaffolds are 0.45 g/cm3, 87.7% and 8.53 MPa, respectively. The density, porosity and flexural strength of SiC composites are 2.08 g/cm3, 5.9%, and 157.43 MPa, respectively. SiC ceramic material with lower density and good flexural strength can be otained by this method.
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2020, Vol. 25 
