采用高温融熔法制备SiO2-Al2O3-MgO-F系可加工玻璃陶瓷基础玻璃,应用XBD、SEM和EPMA等方法对不同预处理条件下样品晶体种类、显微组织进行分析,研究不同预处理条件下云母晶体的析出机制.结果表明:在相同组成的玻璃体系中,由于预处理条件的不同,导致了云母晶体以不同的析出机制析出,并且在不同的析出机制下,云母晶体的形态有着显著的差异.在快速升温的情况下,针状云母晶体在试样表面直接形核,相互平行的云母晶体几乎垂直于试样表面向中心长大;当试样预先在分相区处理后再加热到析晶温度时,针束状云母晶体以分相时形成的晶体为异质核心,呈相互交错方式长大;而当试样在过渡相析出区处理后再加热到析晶温度时,片状云母晶体呈相互交错状以异质外延长大机制析出.
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