铝酸钙准二元玻璃硬度和抗碎裂性组成依赖的结构起源探究  

Structural Origin Revealing of Dependence of Hardness and Crack Resistance on Composition in CaO-Al_(2)O_(3) Pseudo-Binary Glass System

作　　者：王琰[1] 高运周 陶海征[1] 顾少轩[1] WANG Yan;GAO Yunzhou;TAO Haizheng;GU Shaoxuan(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;Sichuan Shenguang Quartz Science and Technology Co.,Ltd.,Mianyang 621700,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]四川神光石英科技有限公司,绵阳621700

出　　处：《硅酸盐通报》2021年第10期3504-3510,共7页Bulletin of the Chinese Ceramic Society

摘　　要：理解玻璃的硬度和抗碎裂性与结构的关系对制备高硬耐摔功能玻璃具有重要的理论指导意义。为探究铝酸钙(CaO-Al_(2)O_(3))准二元玻璃硬度和抗碎裂性随CaO含量的变化规律,采用激光加热气动悬浮方法,制备了组分为xCaO·(100-x)Al_(2)O_(3)(x=42.3、50.0、63.1、75.0,摩尔分数)的系列玻璃样品。利用显微维氏硬度仪、激光共聚焦显微拉曼光谱仪、X-射线衍射仪和魔角旋转固体核磁共振波谱仪,对制备的铝酸钙准二元玻璃的硬度、抗碎裂性和结构进行了详细的表征。结果表明:随着CaO含量增加,玻璃硬度逐渐下降,于x=42.3时硬度最大(8.09 GPa);而玻璃的抗碎裂性随CaO含量增加先降低后急剧增加,并于x=42.3时表现出最大的抗碎裂性(11.8 N)。随着CaO含量增加,平均键能的下降是玻璃硬度下降的原因;高铝含量(x=42.3)的铝酸钙玻璃中部分铝以五配位形式存在,在承受载荷冲击过程中容易改变配位数来耗散能量,是抗碎裂性最大的结构根源。Understanding the relationship between structure and performances such as hardness and crack resistance has guiding significance for the development of the hard and highly crack resistant glass. To study the structural dependence of hardness and crack resistance on composition in the CaO-Al_(2)O_(3) pseudo-binary glass system, utilizing the laser-heated aerodynamic levitation method, a series of xCaO·(100-x)Al_(2)O_(3) glasses were prepared with x=42.3, 50.0, 63.1, and 75.0, mole fraction. The Vickers hardness(HV) and crack resistance(CR) were studied by using a micro-hardness Vicker tester. The structure of these glasses was characterized by Raman spectra, X-ray diffraction(XRD) patterns and magic angle spinning nuclear magnetic resonance(MAS-NMR). The results indicate that with the increase of the CaO content, the HV values of these glasses decrease whereas the CR values show a non-linear and non-exponential change. The 42.3 CaO·57.7 Al_(2)O_(3) glass exhibits the maximum values of HV(8.09 GPa) and CR(11.8 N). The decrease of HV values upon the addition of CaO is attributed to the decrease of average bond energy. The maximum CR value of the 42.3 CaO·57.7 Al_(2)O_(3) glass is ascribed to the existence of five coordinated Al, which dissipates the energy in the indentation process through changing the coordination number.

关 键 词：铝酸钙玻璃 气动悬浮方法 激光加热 硬度 抗碎裂性 配位环境 

分 类 号：TQ171[化学工程—玻璃工业]