中国有色金属学报
ZHONGGUO YOUSEJINSHU XUEBAO
| 第18卷 第11期 总第116期 2008年11月 |
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文章编号：1004-0609(2008)11-2068-08
氧化钇对CaO-BaO-Al2O3-SiO2-GeO2系玻璃结构与性能的影响
肖卓豪，左成钢，朱立刚，陈媛媛，卢安贤
(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 中南大学 有色金属材料科学与工程教育部重点实验室，长沙 410083)
摘 要: 采用传统熔体冷却法制备氧化钇含量为0~6.84%(摩尔分数)系列的多元锗酸盐玻璃，研究氧化钇含量对CaO-BaO-Al2O3-SiO2-GeO2玻璃系统的性能与结构的影响。结果表明：该系统玻璃的密度、玻璃转变温度和热膨胀系数随氧化钇含量的增加而升高，玻璃的化学稳定性随氧化钇含量的增加而下降；在玻璃中加入1.80%氧化钇后，玻璃的抗弯强度值由53.52 MPa增至109.65 MPa；继续增大氧化钇的含量至6.84%时，玻璃的抗弯强度维持在110 MPa左右；氧化钇的加入减少玻璃网络结构中非桥氧数量，使孤立的岛状网络单元重新聚合，增强玻璃的网络结构。同时，由于玻璃网络结构的变化，减少羟基的形成几率，降低玻璃中羟基的含量。
关键字: 锗酸盐玻璃；氧化钇；抗弯强度；结构
Effects of yttria on structure and properties of CaO-BaO-Al2O3-SiO2-GeO2 glasses
XIAO Zhuo-hao, ZUO Cheng-gang, ZHU Li-gang, CHEN Yuan-yuan, LU An-xian
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Non-ferrous Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract: Germanate glasses in CaO-BaO-Al2O3-SiO2-GeO2 system with the yttria contents of 0−6.84% (mole fraction) were prepared by conventional melt quenching technique. The effects of yttria contents on structure and properties of the glass system were investigated. The results show that the density of glass, glass transition temperature and thermal expansion coefficient increase with the increase of yttria content, and the chemical durability decreases with the increase of yttria content. The bend strength of glass increases from 53.52 MPa to 109.65 MPa when 1.80% Y2O3 (mole fraction) is added into glass. However, with the content of yttria further increases to 6.84%, the bend strength is suspended about 110 MPa. Y2O3 acting as network modifies in the structure and makes the island-shape network unit repolymerization by the bonding of Ge-O-Y because of the decrease of non-bridge oxygens (NBOs) and strengthening of glass network structure. At the same time, the change of glass network structure reduces the formation probability of hydroxy, so the content of hydroxy in germanate glass decreases.
Key words: germanate glass; yttria; bend strength; structure
