以W丝作为成孔剂,采用孔隙预置技术制备了发汗多孔C/SiC复合材料,对其孔隙结构进行表征,研究了材料的力学性能和渗透行为.结果表明:采用孔隙预置技术能够有效的控制多孔C/SiC材料开孔率和孔隙结构,其孔隙主要由W丝去除后形成的直通孔组成,开孔率决定于W丝的体积含量,所制备的材料具有良好的力学性能和渗透性能.其弯曲强度达到358 MPa、弯曲模量达到124 GPa,断裂韧性达到16.7 MPa·m1/2,空隙率为23.5%,渗透率为1.02×10-3mm2,材料表现为韧性断裂模式,其孔隙的存在并没有对材料的力学性能产生明显的影响.
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