Criterion for estimating the number of phases in phase-separated glass of the Na2O-K2O-B2O3-SiO2 system by dilatometric analysis

被引：5

作者：

Stolyar, S. V. ^{[1
]}

Konon, M. Yu. ^{[1
]}

Drozdova, I. A. ^{[1
]}

Anfimova, I. N. ^{[1
]}

机构：

[1] Russian Acad Sci, IV Grebenshchikov Silicate Chem Inst, St Petersburg 199034, Russia

来源：

GLASS PHYSICS AND CHEMISTRY | 2014年 / 40卷 / 03期

基金：

俄罗斯基础研究基金会;

关键词：

Na2O-K2O-B2O3-SiO2; system; phase separation; dilatometry; glass transition temperature; onset deformation temperature; electron microscopy;

D O I：

10.1134/S1087659614030213

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The data of dilatometry and electron microscopy of four series of xNa(2)O-(8 - x)K2O-32B(2)O(3)-60SiO(2), xNa(2)O-(8 - x)K2O-22B(2)O(3)-70SiO(2), xNa(2)O-(6 - x)K2O-34B(2)O(3)-60SiO(2), and xNa(2)O-xK(2)O-(40 - 2x)B2O3-60SiO(2) phase-separated glass heat-treated at 550A degrees C for 144 h (for glass containing 70 mol % SiO2) and 24 h (for glass containing 60 mol % SiO2) for separation on phases are summarized. The comparison of dilatometric data and electron microscopy allow one to conclude that glass with a difference between the onset deformation temperature and a glass transition temperature of more than 100A degrees C is phase-separated; and glass with a difference of less than 65A degrees C is single-phase. Curves for the glass transition temperature as a function of the K2O content reveal a mixed alkali effect, namely, minimums for glass containing 60% SiO2, and maximums for glass containing 70% SiO2.

引用

页码：298 / 302

页数：5

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