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使用晶化法制备以二硅酸锂为主晶相,P_2O_5为主要形核剂的锂锌硅微晶玻璃。引入稀土Er_2O_3掺杂Li_2OSiO_2-P_2O_5-ZnO系统基础玻璃。通过测试该系统微晶玻璃的差热曲线、X射线衍射图谱、高温粘度曲线和扫描电镜图像,研究引入Er_2O_3含量的变化对该系统微晶玻璃析晶性能、次晶相的种类和含量、高温粘度变化、析出晶粒的大小及分布情况和微晶玻璃抗弯强度的影响。结果表明:引入Er_2O_3提高该系统微晶玻璃的玻璃转化温度,提高锂锌硅微晶玻璃晶化热处理的温度,影响了次晶相偏硅酸锂晶相的析出,通过改变微晶玻璃次晶相的种类和含量,降低了体系的热膨胀系数,掺杂0.3%的Er_2O_3提高了二硅酸锂的析晶速率,并降低了该系统微晶玻璃的高温粘度,当Er_2O_3的掺杂量为0.3%时,该体系微晶玻璃获得最大的抗弯强度310 MPa。
Lithium zinc silicate glass ceramics with lithium disilicate as the main crystal phase and P 2 O 5 as the main nucleating agent were prepared by crystallization. The basic glass doped with rare earth Er 2 O 3 doped Li 2 OSiO 2 -P 2 O 5-ZnO system was introduced. By measuring the differential thermal curve, the X-ray diffraction pattern, the high-temperature viscosity curve and the scanning electron microscope image of the system glass-ceramics, the change of the content of Er 2 O 3 was introduced to study the crystallization performance, the type and content of the secondary crystal phase, Viscosity changes, the size and distribution of precipitated grains and the impact strength of glass-ceramics. The results show that the introduction of Er 2 O 3 increases the glass transition temperature of the system glass-ceramics and increases the temperature of the crystallization heat treatment of the lithium-zinc-silicon-glass-ceramics, which affects the precipitation of the crystalline phase. Phase type and content, reducing the thermal expansion coefficient of the system, doping 0.3% of Er 2 O 3 increased lithium disilicate crystallization rate and lower the high temperature viscosity of glass-ceramic system, when the Er 2 O 3 doping amount of 0.3 %, The system of glass ceramics to obtain the maximum bending strength of 310 MPa.