量热法研究Li_2S—B_2O_3玻璃晶化动力学

Calorimetric Studies on the Crystallization Kinetics of Li_2S-B_2O_3 Glasses

采用惰性气体保护下的高温熔融反应及氮淬冷技术，制备了xLI2S·（1—X）B2O23玻璃。利用DSC量热法研究了玻璃的非等温晶化动力学，计算得到晶化活化能E，Avrami指数n及晶化热—△H等动力学参数。实验发现，xLi2S·（1—X）B2O3硫氧化物能在X≤0．45的区域形成玻璃，x=0．25玻璃组份具有最强的抗晶化能力，而x=0．45玻璃组份最易晶化。玻璃的晶化为一热激活过程，且主要由表面成核机理控制。玻璃晶化活化能在180—100μm颗粒范围有最大值，晶化热—△H与峰值温度Tp满足线性关系。

xLi2S·(1-x)B2O3 glasses were prepared by high temperature melting reaction and liquid nitrogen quenching technique under inert gas atmosphere. The non-isothermal crystallization kinetics of the glasses was studied via differential scanning calorimetry (DSC)method,and the crystallization activation energy, E, Avrami exponent, n, crystallization enthalpy, -△H, were estimated. It is found that in xLi2S·(1-x)B2O3 oxysulfide system, glasses can be formed within the composition range of x≤0. 45. The x=0. 25 glass shows the strongest stability againgst crystallization,while the x=0. 45 glass is the least stalble composition among glass samples. The crystllization is a thermally activated process,and it is mainly controlled by a surface nucleation mechanism. The Activation energy is maximal at particle size of 180-100μm. Crystallization enthalpy, -△H,and peak temperature,Tp. are linearly dependent.