DETERMINING THE NUCLEATION RATE CURVE FOR LITHIUM DISILICATE GLASS BY DIFFERENTIAL THERMAL-ANALYSIS

被引：194

作者：

RAY, CS ^{[1
]}

DAY, DE ^{[1
]}

机构：

[1] UNIV MISSOURI,GRAD CTR MAT RES,ROLLA,MO 65401

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1990年 / 73卷 / 02期

关键词：

differential thermal analysis; glass; lithia; nucleation; silica;

D O I：

10.1111/j.1151-2916.1990.tb06532.x

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 crystallization of lithium disilicate (Li2O·2SiO2) glass nucleated at various temperatures was studied by differential thermal analysis (DTA). A plot of the DTA crystallization peak height versus nucleation temperature closely resembles the classical nucleation rate curve for lithium disilicate glass whose maximum is at 453°C. The glass becomes saturated with internal nuclei when heated at 453°C for 10 h. The DTA technique is a rapid, alternative method for determining the temperature for maximum nucleation. The activation energy for crystallization, E, and the heat of crystallization, H, are independent of the concentration of nuclei and are 249±10 and 67±3 kJ/mol, respectively. The Avrami exponent, n, depends strongly on the concentration of nuclei in the glass. Copyright © 1990, Wiley Blackwell. All rights reserved

引用

页码：439 / 442

页数：4

共 7 条

[1] CALCULATION OF AVRAMI PARAMETERS FOR HETEROGENEOUS SOLID-STATE REACTIONS USING A MODIFICATION OF KISSINGER METHOD [J].