为了提高石英纤维/SiO2复合材料的强度,避免因石英纤维析晶而造成复合材料力学性能的降低,本文中详细地研究了石英纤维的析晶行为.采用FT-IR技术测试了石英纤维的化学键结构,应用DSC和XRD技术综合分析了石英纤维的析晶过程,并结合SEM、TEM观察了石英纤维的析晶现象及产物.测试结果表明,石英纤维结构中含有大量的Si-OH键; 析晶过程受结构重排控制较为明显,DSC曲线中存在明显的结构重排吸热峰.XRD测试显示,石英纤维析晶产物为单一α-方石英相,起始析晶温度为950℃,1400℃左右达到析晶最大量,温度明显低于石英玻璃的析晶温度.Si-OH键、杂质以及界面等因素是石英纤维析晶温度低于石英玻璃的主要原因.
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