铝酸钙玻璃的红外性能和析晶动力学研究

Study on Infrared Property and Crystallization Kinetics of Calcium Aluminate Glass

铝酸钙玻璃是一种性能优异的中红外透过材料,而少量OH-的存在和成玻性差严重制约了铝酸钙玻璃的应用。本文研究了熔制工艺对铝酸钙玻璃红外性能的影响,并采用非等温方法研究了铝酸钙玻璃的析晶动力学。结果表明,采用RAP方法可有效消除铝酸钙玻璃的OH-,制备的玻璃具有优异透红外性能,OH-浓度仅为0.19×1018cm-3。利用Kissinger方程,计算出铝酸钙玻璃的析晶活化能Ec,两个析晶峰对应的Ec1=369.8 kJ/mol和Ec2=522.7 kJ/mol。另外,两个析晶峰对应的析晶指数分别为1.8和2.2,均为表面控制析晶。

Calcium aluminate glass is a good candidate of infrared material.However,the residual OH-in calcium aluminate glass and the poor glass-forming ability of calcium aluminate glass restrict its application.The infrared property and crystallization kinetics of calcium aluminate glass were studied.The results showed that the calcium aluminate glass fabricated by RAP has an excellent infrared transmittance owing to lower OH-concentration（only 0.19×1018 cm-3）.The activation energies of crystallization obtained from Kissinger model of the first exothermal peak and the second exothermal peak of calcium aluminate glass are 369.8 kJ/mol and 522.7 kJ/mol,respectively.The crystallization exponents of the both peaks are approximately 2,indicating the surface controlled crystallization during its from amorphous to crystalline.