CuO对堇青石微晶玻璃析晶行为及微波介电性能的影响  

Effect of CuO on Crystallization Behavior and Microwave Dielectric Properties of Cordierite Glass-Ceramics

作　　者：张杰[1] 陈巧 刘佳 李路瑶[1] 王静[1] 韩建军[1] ZHANG Jie;CHEN Qiao;LIU Jia;LI Luyao;WANG Jing;HAN Jianjun(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;State Key Laboratory of Optical Fiber and Cable Manufacture Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [2]光纤光缆先进制造与应用技术全国重点实验室,武汉430070

出　　处：《硅酸盐通报》2024年第10期3843-3851,共9页Bulletin of the Chinese Ceramic Society

基　　金：光纤光缆先进制造与应用技术全国重点实验室(长飞公司)开放课题(SKLD2207)。

摘　　要：本文采用烧结-析晶法制备了xCuO-(22.2-x)MgO-22.2Al_(2)O_(3)-55.6SiO_(2)(x=0、0.25、0.50、0.75、1.00,摩尔分数)(MAS)微晶玻璃,研究了CuO含量对MAS微晶玻璃析晶行为、晶相种类、微观形貌和微波介电等性能的影响。结果表明,随着CuO对MgO的取代量从0%增加到1.00%,玻璃化转变温度降低,析晶峰温度也表现出降低的趋势,Avrami指数n逐渐增加。微晶玻璃的主晶相为α-堇青石,CuO的加入促进了μ-堇青石在更低温度完成向α-堇青石的转变且有利于热膨胀系数的降低。随着CuO含量增大,微晶玻璃介电常数先增加后减小,介电损耗则是先减小后增加。在650℃/2 h+1050℃/2 h下,CuO含量为0.25%和0.50%的微晶玻璃介电性能综合较优,在14.6~15.2 GHz频率下,介电常数分别为5.05和5.07,介电损耗分别为7.49×10^(-4)和7.12×10^(-4),品质因数分别为20013.35和20786.41 GHz。The xCuO-(22.2-x)MgO-22.2Al_(2)O_(3)-55.6SiO_(2)(x=0,0.25,0.50,0.75 and 1.00,molar fraction)(MAS)glass-ceramics were synthesized using sintering-crystallization method.The effect of CuO content on the crystallization behavior,crystal type,micromorphology and microwave dielectric properties of MAS glass-ceramics was studied.The results show that as the CuO content increases from 0%to 1.00%,substituting for MgO,the glass transition temperature decreases.Additionally,the precipitation peak temperatures also show a decreasing trend,while the Avrami index n gradually increases.The primary crystalline phase in glass-ceramics isα-cordierite.The inclusion of CuO facilitates the transformation ofμ-cordierite toα-cordierite at lower temperatures and reduces the thermal expansion coefficient.With the increase of CuO content,the dielectric constant of glass-ceramics increases first and then decreases,while the dielectric loss decreases first and then increases.At a heat treatment 650℃/2 h+1050℃/2 h,the glass-ceramics doped with 0.25%and 0.50%CuO exhibits optimal integrated dielectric properties,which dielectric constant is 5.04 and 5.07,dielectric loss is 7.49×10^(-4) and 7.12×10^(-4),and quality factor is 20013.35 and 20786.41 GHz within the frequency range of 14.6~15.2 GHz.

关 键 词：堇青石微晶玻璃 CUO 烧结-析晶法 微波介电性能 析晶动力学 

分 类 号：TQ171[化学工程—玻璃工业]