以聚丙烯腈预氧化纤维为先驱体,氧化铝为主要原料,添加SiO2-MgO-CaO三系助熔剂,采用真空热压烧结法制备原位转化炭纤维增韧氧化铝陶瓷基复合材料.研究助熔剂对复合材料相结构、显微组织以及密度、硬度和断裂韧性的影响.结果表明:助熔剂的添加使复合材料在较低的烧结温度下便实现烧结,且提高复合材料的密度和力学性能.助熔剂在烧结过程中与氧化铝形成镁铝尖晶石等第二相,在晶界起钉扎效应,抑制氧化铝晶粒的长大,消除气孔,促进复合材料的致密化,改善炭纤维与基体间的界面结合强度,提高复合材料的韧性.
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