【摘要】 应用光学显微镜（ＯＭ）和扫描电子显微镜（ＳＥＭ）等技术，系统研究了ＳｉＯ２－ Ａｌ２Ｏ３－ＭｇＯ－Ｆ系玻璃和玻璃陶瓷在等温条件下析晶组织转变和转变动力学．结果表明： 针状云母晶体首先从玻璃体表面形核，然后以一维模式向玻璃体内部长大．根据Ｊｏｈｎ－ Ｍｅｈｌ－Ａｖｒａｍｉ方程，得到玻璃转变的反应生长指数ｎ为１，活化能Ａ为２７６．９７ｋＪ／ｍｏｌ．更多还原

【Abstract】 The crystallization and crystallizing kinetics of the glass-ceramics in the glass system SiO2-Al2O3-MgO-F have been studied by using OM and SEM technique. The results show that the crystallization process is thought to proceed by a needle-like growth from the surface of glass when heated quickly to crystallizing temperatures (950℃-1050℃). By aid of John-Mehl-Avrami function, the reaction order n=1, and the activity energy A=276.94kJmol-1 can be get respectively.更多还原