热处理制度对Li_2O-SiO_2-P_2O_5系统玻璃的析晶和微观结构的影响  

The Effect of Heat Treatments on the Crystallization and Microstructure in the Li_2O-SiO_2-P_2O_5 Glass System

作　　者：郑欣[1] 温广武[1,2] 黄小萧[1] 张宝友[1] 

机构地区：[1]哈尔滨工业大学,黑龙江哈尔滨150001 [2]哈尔滨工业大学(威海),山东威海264209

出　　处：《稀有金属材料与工程》2008年第A01期756-758,共3页Rare Metal Materials and Engineering

摘　　要：采用传统的熔融法制备了以P_2O_5为形核剂的Li_2O-SiO_2系统基础玻璃。通过差热分析方法获得该玻璃晶化的热处理条件,并确定了一步法和两步法的热处理工艺。利用XRD和SEM对一步法和两步法晶化处理后试样的物相组成和微观结构进行分析,讨论了不同热处理制度对析出晶相的种类和微观结构的影响。结果表明:一步法热处理得到的主晶相为亚稳定的一硅酸锂(Li_2SiO_3)晶体,继续升高热处理温度后,一硅酸锂(Li_2SiO_3)晶相向二硅酸锂(Li_2Si_2O_5)转变,最后两步法热处理试样的晶相种类为Li_2SiO_3和Li_2Si_2O_5 2种晶体。两步法热处理有利于稳定的Li_2Si_2O_5晶体析出。从一步法到两步法的热处理,Li_2Si_2O_5晶体的尺寸明显增加。另外,对于两步法热处理,在相同的形核时间下,延长晶体长大时间,Li_2Si_2O_5晶体的生长比较缓慢。The glass of Li2O-SiO2 was prepared along the conventional melting route with P2O5 as the nucleation agent. By the DSC measurements, we determined the crystallization temperatures of the glass and developed the one-step and two-step heat-treated processes. The crystal phases and microstructure of the glass under heating were studied by means of XRD and SEM. Meanwhile, the effect of the different heat treatment processes on the crystal phases and microstructure was discussed. The results showed that the main crystal phase from the one-step treated specimens was Li2SiO3. However, Li2SiO3 transformed to Li2Si2O5 crystalline phases during the two-step heat treatment. Finally, Li2SiO3 and Li2Si2O5 crystals coexisted in the materials by the two-step treatment. The grain size of Li2Si2O5 crystals did not change obviously with increasing the crystallization time in the two-step hear treatments.

关 键 词：微晶玻璃 热处理制度 析晶 微观结构 

分 类 号：TQ171[化学工程—玻璃工业]