将高岭石熟料粉、炭黑粉和金属铝粉按n(Al2O3)∶n(C)∶n(Al)=1∶6.5∶2.6配料作为基料,保持高岭石熟料粉和炭黑的量不变,改变金属铝粉的量,使n(Al)从2.6分别增加到3.9、5.5、7.0、8.6和10.4,以酚醛树脂为结合剂,无水酒精为分散剂,混匀后压制成型,坯体试样干燥后,在刚玉质管式炉内,氩气气氛下,于1 700℃保温2 h制备了Al4SiC4-Al4O4C复合材料.利用DTA-TG、XRD和SEM等测试技术,研究了铝粉加入量对该材料相组成和显微结构的影响.结果表明:在一定范围内随着金属Al粉加入量的增加,Al4SiC4产物的含量也会相应的增加.试样中生成的Al4SiC4有片状和块状两种形貌,粒径分别在5～15和10～20 μm之间.金属Al粉添加量的增加,对Al4SiC4晶粒形状和粒径影响不大;合成的Al4O4C粒径一般在1μm以下,主要分布在Al4SiC4晶粒表面,形状无规则,部分还粘结在一起.
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