以水为溶剂,采用铝粉、AlCl3? H 2 O、酸性硅溶胶为原料,通过溶胶-凝胶法制备了多晶莫来石纤维.借助 X 射线小角散射(SAXS)测试了 Al3＋的聚集形态,采用 XRD、SEM、HRTEM 等测试手段分析不同热处理温度下纤维的物相组成,纤维形貌,晶型结构等.X 射线小角散射的结果表明,Al3＋主要以 Al13(OH)25 Cl15的形态存在于聚合氯化铝溶胶中.纤维前驱体经1050℃热处理后主晶相为莫来石,随着温度升高至1200℃,晶相结构趋于完整,HRTEM 分析结果说明了纤维的多晶结构.
The polycrystalline mullite fibers were prepared by sol-gel method,using aluminum powders,AlCl3 ?H 2 O and acidic silica sol as raw materials,deionized water as solution.The aggregation state of Al3 + was tested by SAXS.The phase composition,fiber morphology,crystalline structure of mullite fibers by heated to differ-ent temperature were analyzed by XRD,SEM and HRTEM.The results of SAXS show that Al3 + ions aggregate in the PAC sol exists in the form of Al1 3 (OH)2 5 Cl1 5 .XRD and SEM analysis show that the main crystal phase was mullite at 1 050 ℃.The crystal phase structure tends to be complete after heated to 1 200 ℃.The results of HRTEM show that polycrystalline structure of fiber.
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