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。
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 ofyttria 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 1 10 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 ofhydroxy in germanate glass decreases.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2008年第11期2068-2075,共8页
The Chinese Journal of Nonferrous Metals
基金
国家民口配套资助项目(JPPT-115-332)
