【摘要】 通过向Li2O-Al2O3-SiO2玻璃体系中加入一定量的MgF2,获得了一种新的纤维状的β-锂辉石晶相,初晶相为MgF2相,随后直接析出β-锂辉石相,完全抑制了亚稳定相β-石英固溶体的析出．分相促进了细小和高度分散的MgF2颗粒的析出,而MgF2的析出又为颗粒状β-锂辉石晶粒的非均匀形核提供了有效形核位置,随温度的升高和时间的延长,某些占据有效生长位置的颗粒状晶粒择优长大,得到纤维状β-锂辉石．在热处理条件为850℃／1h时,抗弯强度达到最大值228MPa．更多还原

【Abstract】 A novel whisker-like β- spodumene glass-ceramics was obtained. Scanning electron microscope (SEM) investigations demonstrated phase separation in the base glass and lead to the formation of a primary crystal phase of MgF2 that promoted the formation of spherical β-spodumene. The whisker-like spodumene crystals surrounded by spherical crystals, and the whisker-like crystals grew at the expense of spherical crystals with increasing temperature and time. This means that formation mechanisms of whisker β-spodumene would be: β-spodumene nucleated and formed as spherical crystals firstly, it grew to whisker form with increasing temperature and time increased. The flexural strength of the glass ceramics reached the maximum 228MPa after heat treated at 850 ℃/1h.更多还原