采用高温熔融法制备了CaO-MgO-SiO2陶瓷纤维,并在800～1 200℃进行了热处理,研究了热处理温度对该陶瓷纤维表面形貌和抗水化性能的影响.结果表明:热处理温度的升高会导致纤维从表面晶化变为整体晶化,呈现为晶态和无定形态共存的结构;不同温度热处理后纤维的结构差异及相界面的存在,导致其在去离子水浸泡过程中,与OH-之间表现出不同的反应活性,进而显著影响了热处理后纤维的抗水化性能.
CaO-MgO-SiO2 ceramic fibers were prepared by the high-temperature melting method,and then heat-treated at temperatures of 800-1 200 ℃.The effects of the heat-treatment temperature on the surface morphology and on the hydration resistance of the ceramic fibers were studied.The results show that the crystallization of the fiber changed from the surface crystallization to the overall crystallization due to the increasing heat-treatment temperature,and the fibers showed a coexisting structure of crystalline state and amorphous state.The structure difference between the different temperature heat-treated fibers and the existence of the phase boundary resulted in the different reaction activities between fibers and OH-during the soaking process in the deionized water,furthermore significantly affected the hydration resistance of the heat-treated fibers.
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