【摘要】 以水为溶剂,采用铝粉、Al Cl3·H2O、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)25Cl15的形态存在于聚合氯化铝溶胶中。纤维前驱体经1 050℃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。更多还原

【Abstract】 The polycrystalline mullite fibers were prepared by sol-gel method,using aluminum powders,Al Cl3·H2O 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 different 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 Al13( OH)25Cl15. 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.更多还原