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应用差热分析（ＤＴＡ）及Ｘ射线衍射分析了硅酸铝纤维及其预制件的相结构转变特性。研究结果表明，硅酸铝纤维及其预制件的ＤＴＡ曲线上各有一放热峰，温度区间分别为９８５～１０４３℃和９８２～１０４３℃；Ｘ射线衍射显示：在９８５℃以下，硅酸铝纤维呈非晶结构，高于９８５℃时，析出莫来石和方石英，并定量计算出不同温度下硅酸铝纤维晶化的百分率。在硅酸铝预制件中，纤维与粘结剂Ｈ３ＰＯ４的反应生成物为Ａｌ（ＰＯ３）３；预制件由于Ｈ３ＰＯ４的加入，在高温时（Ｔ＞９００℃）方石英的析出量高于单一硅酸铝纤维中方石英的析出量。
Differential thermal analysis (DTA) and X-ray diffraction were used to analyze the phase transition behavior of the aluminum silicate fibers and their preforms. The results show that there is an exothermic peak on the DTA curve of aluminum silicate fiber and its preform respectively, with the temperature range of 985 ~ 1043 ℃ and 982 ~ 1043 ℃, respectively. X - ray diffraction shows that under the temperature of 985 ℃, Was amorphous structure, higher than 985 ℃, the precipitation of mullite and cristobalite, and quantitative calculation of the aluminum silicate fibers at different temperatures crystallization percentage. In the aluminum silicate preform, the reaction product of the fiber and the binder H3PO4 is Al (PO3) 3. The precipitated amount of cristobalite at the high temperature (T> 900 ° C.) is higher than that of the single silicon Chinese acid aluminum fiber precipitation of Chinese quartz.