Preparation, Crystallization and Mechanical Properties of Potassium Aluminosilicate Glass-ceramics  

作　　者：郑伟宏 黄猛 GAO Zipeng ZHANG Hang YUAN Jian TIAN Peijing PENG Zhigang ZHENG Weihong;HUANG Meng;GAO Zipeng;ZHANG Hang;YUAN Jian;TIAN Peijing;PENG Zhigang(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;Shahe Research Institute of Glass Technology,Shahe 054100,China)

机构地区：[1]State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China [2]Shahe Research Institute of Glass Technology,Shahe 054100,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2024年第3期587-595,共9页武汉理工大学学报（材料科学英文版）

基　　金：Funded by State Key Laboratory of Silicate Materials for Ar-chitectures(Wuhan University of Technology)(No.2011DA105356)。

摘　　要：In this study,transparent K_(2)O-Al_(2)O_(3)-SiO_(2)(KAS)glass-ceramics with leucite as the main crystalline phase were prepared by melting-quench method and two-step heat treatment.The effects of SiO_(2)/Al_(2)O_(3) ratio and heat treatment on crystallization and mechanical properties were studied.The crystallization kinetics and X-Ray Diffraction(XRD)results showed that SiO_(2)/Al_(2)O_(3) ratio and heat treatment system had a direct impact on the crystallization behavior of potassium aluminosilicate glass-ceramics.When heat-treated at 680℃/2 h and 780℃/1 h,cracks generated on the surface of the sample with the addition of SiO_(2)/Al_(2)O_(3)=4.8(in mol)due to the huge difference in the coefficient of thermal expansion between glass matrix and surface.When the addition of SiO_(2)/Al_(2)O_(3)(in mol)was 4,the sample with leucite as the main crystalline phase showed an excellent fracture toughness(1.46 MPa·m^(0.5))after the heat treatment of 680℃/2 h and 780℃/5 h.And there was a phase transformation from kaliophilite to leucite.The crystalline phases of the sample heat-treated at 680℃/8 h and 780℃/1 h were leucite and kaliophilite,which resulted in the visible light transmittance of 63%and the fracture toughness of 0.91 MPa·m^(0.5).Furthermore,after the heat treatment of 680℃/2 h and 780℃/5 h,the main crystalline phase of the sample with SiO_(2)/Al_(2)O_(3)=3.2(in mol)was still kaliophilite.Because leucite only grows on the surface of the sample and is hard to grow inward,it is hard to achieve the bulk crystallization of leucite in the sample with SiO_(2)/Al_(2)O_(3)=3.2(in mol).

关 键 词：LEUCITE GLASS-CERAMIC kaliophilite crystallization kinetics 

分 类 号：TQ171.733[化学工程—玻璃工业]