晶核剂对透明堇青石微晶玻璃析晶与性能的影响  

Effect of Nucleating Agent on Crystallization and Properties of Transparent Cordierite Glass-Ceramics

作　　者：郑伟宏[1] 张航[1] 高子鹏 黄猛 袁坚[1] 田培静[1] 彭志钢 ZHENG Weihong;ZHANG Hang;GAO Zipeng;HUANG Meng;YUAN Jian;TIAN Peijing;PENG Zhigang(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;Shahe Glass Technology Research Institute,Xingtai 054100,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]河北省沙河玻璃技术研究院,邢台054100

出　　处：《硅酸盐通报》2023年第4期1466-1474,共9页Bulletin of the Chinese Ceramic Society

基　　金：硅酸盐建筑材料国家重点实验室(武汉理工大学)开放基金(2011DA105356)。

摘　　要：采用熔融法制备了含有不同晶核剂的非化学计量比堇青石微晶玻璃,通过DSC、XRD、FE-SEM、UV-VIS-NIR等测试方法研究了不同晶核剂对微晶玻璃析晶与性能的影响,并用经典动力学方程(Johnson-Mehl-Avrami)分析了微晶玻璃的析晶动力学。结果表明,以P_(2)O_(5)和P_(2)O_(5)+ZrO_(2)为晶核剂的微晶玻璃晶化机制均为表面晶化,而以P_(2)O_(5)+ZrO_(2)+TiO_(2)为晶核剂的微晶玻璃则倾向于整体析晶。三组微晶玻璃在950℃晶化时主晶相为μ-cordierite,当温度升高到980℃时开始转变为α-cordierite,引入TiO_(2)使α-cordierite的含量增加,析出的晶体更加复杂致密。随着晶化时间延长,与其他晶核剂相比,P_(2)O_(5)+ZrO_(2)+TiO_(2)组合晶核剂微晶玻璃在相同晶化时间内结晶度更高,α-cordierite含量的增加显著提升了微晶玻璃的力学性能,但降低了透过率。在800℃/10 h+980℃/3 h热处理制度下,以P_(2)O_(5)+ZrO_(2)+TiO_(2)为晶核剂的微晶玻璃弹性模量可达103 GPa,断裂韧性为1.27 MPa·m1/2,透过率为82.3%,可满足用作移动终端领域的性能要求。Cordierite silicon glass-ceramics with different nucleating agents were prepared by melting.The effects of different nucleating agents on the crystallization and properties of glass-ceramics were studied by DSC,XRD,FE-SEM,UV-VIS-NIR and other test methods,and the crystallization kinetics of glass-ceramics with different nucleating agents were analyzed using the classical kinetic equation(Johnson-Mehl-Avrami).The results indicate that the crystallization mechanism of glass-ceramics with P_(2)O_(5)or P_(2)O_(5)+ZrO_(2)as nucleating agent is controlled by surface crystallization.However,the glass-ceramics with P_(2)O_(5)+ZrO_(2)+TiO_(2)as nucleating agent has the tendency to be bulk crystallization.With the crystallization temperature increases from 950℃to 980℃,theμ-cordierite in the three groups of glass-ceramics begins to transform intoα-cordierite.While the introduction of TiO_(2)increases theα-cordierite content,the precipitated crystals become dense.With the extension of crystallization time,compared with other nucleating agent,the glass-ceramics with P_(2)O_(5)+ZrO_(2)+TiO_(2)as nucleating agent obtain higher crystallinity within the same crystallization time,the increase ofα-cordierite content significantly improves the mechanical properties of glass-ceramics,but decreases the light transmittance.Under the heat treatment system of 800℃/10 h+980℃/3 h,the elastic modulus of glass-ceramics with P_(2)O_(5)+ZrO_(2)+TiO_(2)as nucleating agent reaches 103 GPa,the fracture toughness is 1.27 MPa·m1/2 and the light transmittance is 82.3%,which meet the performance requirements of mobile terminals.

关 键 词：MgO-Al_(2)O_(3)-SiO_(2) 堇青石 晶核剂 透明微晶玻璃 弹性模量 析晶动力学 

分 类 号：TQ171[化学工程—玻璃工业]