烧结法制备锂锌硅微晶玻璃热处理制度的研究

Research on Heat Treatment Process of Li_2O-ZnO-SiO_2 Glass-ceramics by Sintering

使用烧结法制备了LZS系微晶玻璃。采用差热分析(DTA)、X射线衍射分析(XRD)、扫描电镜(SEM)等分析手段对该系统微晶玻璃的析晶过程和微观结构进行了研究。通过正交试验讨论了热处理参数对微晶玻璃热膨胀性能的影响。结果表明:随着晶化温度的升高,主晶相由硅酸锂锌转变为石英,晶相含量随之增高;晶体为棒状,随温度升高和时间延长而增大;各参数对热膨胀性影响大小为晶化温度>晶化时间>核化时间>核化温度;可以通过调节热处理工艺参数调节热膨胀系数,热膨胀系数决定于主晶相的热膨胀系数及晶相含量。

LZS glass-ceramics were prepared via sintering method.The crystallization and microstructure of LZS system glass-ceramics were studied by XRD and SEM.By means of orthogonal testing method,the effect of the heat treatment temperature and time on the thermal expansion properties of the glass-ceramics was discussed.The results show that Li3Zn0.5SiO4 precipitated first at the initial crystallization temperature,then quartz with increasing temperature.The length of the crystal increased after higher temperature and longer heating time.Effect of the parameters of the heat treatment process on thermal expansion coefficient was studied and the results show that the crystallization temperature was the most important factor.The thermal expansion coefficient was influenced by the major crystalline phase and its amount and could be controlled by the heat treatment process.