的TiO2在1 300 ℃前全部反应转变为TiC,生成的TiC在1 300～1 700 ℃稳定存在;Tio2加入量对材料物相组成没有明显影响,但TiO2加入量超过3%时,Al4SiC4和Al4O4C的生成温度将由1 500℃提升至1 600℃;随着材料中Ti4+浓度增加,Ti4+更容易与Al4SiC4形成有限置换固溶体而导致晶格缺陷,促使Al4SiC4在1 700℃分解,形成更多的Al4O4C短纤维,同时使试样表面生成片状Al2O3层.
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