本研究以γ-AlOOH、TiO2和SiC为原料,通过无压反应烧结制备了Al2TiO5多孔材料,分析比较了SiC粒度和含量对合成产物的物相组成、显微组织、抗压强度、孔隙率和孔径分布的影响.结果表明:反应产物的物相组成为Al2TiO5、Al6Si2O13、TiC、SiO2和Al2O3,还有少量未反应的TiO2.SiC与TiO2反应生成TiC和SiO2,TiC颗粒弥散分布于多孔材料壁面或者骨架中,而SiO2进一步与γ-AlOOH分解出的Al2O3反应生成Al6Si2O13晶须,晶须交错分布于Al2TiO5颗粒之间或者孔洞中,与TiC颗粒一起提高复合材料的抗压强度,特别是采用小粒径SiC时,对抗压强度的改善效果更加显著;添加大粒径SiC后,改变原有颗粒堆积状态,可提高复合材料的孔隙率.但当SiC含量超过5wt％时,因为生成较多低熔点的SiO2,部分填充于多孔材料的孔隙中,部分则分布于Al2TiO5晶粒之间,既减小孔隙率,又降低晶粒间结合强度和试样的抗压强度.
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