Y或La对Ca-Si-Al-O-N氧氮玻璃结构与性能的影响  

Effects of yttrium/lanthanum on structure and properties of Ca-Si-Al-O-N oxynitride glasses

作　　者：罗志伟[1] 刘学锋[1] 王克强[1] 胡晓林[1] 卢安贤[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2013年第11期4415-4422,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51272288);湖南省研究生创新项目(CX2011B108)

摘　　要：在高纯氮气保护气氛下于1 550～1 650℃在硅钼电阻炉中熔融2 h制备添加钇或镧的Ca-Si-Al-O-N系氧氮玻璃。采用X线衍射和扫描电镜(SEM)确定玻璃样品的无定形态本质。利用傅里叶变换红外光谱(IR)研究玻璃的基本结构单元。对比La3+平衡浓度比或Y3+平衡浓度比对氧氮玻璃的热膨胀系数(α)、玻璃转变温度(Tg)、析晶温度(Tc)、维氏显微硬度(HV)和抗弯强度(σ)等性能的影响。利用阳离子场强(CFS)讨论玻璃的结构与性能之间的关系。研究结果表明:玻璃的性能分别随La或Y平衡浓度比的变化几乎呈线性变化。Y对玻璃的结构和性能的影响比La更大。Ca-Si-Al-O-N oxynitride glasses with rare-earth yttrium and lanthanum were prepared by melting batches at 1 550-1 650℃ for 2 h under N2 atmosphere in a Si-Mo-heated resistance furnace. The amorphous nature of the samples was verified by an X-ray diffractometer and scanning electron microscope （SEM）. The basic structural units in these glasses were studied by Fourier-transform IR spectroscopy. The influences of La3＋ or y3＋ on the properties such as thermal expansion coefficients （a）, glass transition temperature （Tg）, the crystallization temperature （Tg）, Vickers hardness （Hv） and bending strength （a） were comparatively studied. The relationship between these properties and the structures of the glasses were discussed by using cationic field strength （CFS）. The results show that the physical properties change linearly with the concentration of lanthanum or yttrium content, respectively. In general, the structure and properties of glasses show a larger dependence on the yttrium content than on the content of lanthanum.

关 键 词：稀土 氧氮玻璃 红外光谱 热性能 力学性能 

分 类 号：TQ171.1[化学工程—玻璃工业]