Effects of yttria on structure and properties of CaO-BaO-Al2O3-SiO2-GeO2 glasses

被引：0

作者：

Xiao, Zhuo-Hao ^{[1
,2
]}

Zuo, Cheng-Gang ^{[1
,2
]}

Zhu, Li-Gang ^{[1
]}

Chen, Yuan-Yuan ^{[1
,2
]}

Lu, An-Xian ^{[1
,2
]}

机构：

[1] School of Materials Science and Engineering, Central South University, Changsha 410083, China

[2] Key Laboratory of Non-ferrous Materials Science and Engineering, Central South University, Changsha 410083, China

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2008年 / 18卷 / 11期

关键词：

Glass bonding - Silica - Thermal expansion - Alumina - Aluminum oxide - Barium compounds - Chemical bonds - Germanium oxides - Glass transition - Yttrium oxide;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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.

引用

页码：2068 / 2075