热膨胀法测定玻璃热性能的应用评估
Application Evaluation of Thermal Expansion Method for Measuring Glass Thermal Properties
柏晓强 1曹国荣 1邢文忠 1章林 1洪秀成 1赵刚1
作者信息
摘要
热膨胀法可以测定玻璃的热性能,包括:热膨胀系数α与应变点Tst、转变点Tg、退火点Ta、膨胀软化点兀等特征温度点.对热膨胀法测定玻璃热性能的应用进行评估,评估结果表明:(1)玻璃的热膨胀系数α会随着温度段变化而变化,同时在一定范围内,升温速率越大,热膨胀系数越小;(2)热膨胀法测定玻璃特征温度点的重复性偏差在±10℃以内,一定范围内,升温速率越大,特征温度点温度越高;(3)热膨胀法测定玻璃热性能的升温速率优选3℃/min;(4)玻璃中B2O3含量越高,同时CaO含量越低,那么玻璃的热膨胀系数α越小,玻璃的应变点Tst与转变温度gT越小,退火加工温度范围也就越大.
Abstract
Thermal expansion method can measure glass thermal properties,including coefficient of thermal expansion α and Characteristic temperature points such as strain point Tst,transition point Tg,annealing point Ta,expansion softening point Td,etc.The evaluation of the application in measuring glass thermal properties using thermal expansion method shows that:(1)Thermal expansion coeficient α of glass will change with temperature changes,and within a certain range,the larger the heating rate,the smaller the coefficient of thermal expansion;(2)The repeatability deviation of thermal expansion method for measuring the characteristic temperature points of glass is within±10℃.Within a certain range,the higher the heating rate,the higher the characteristic temperature point temperature;(3)The optimal heating rate for measuring thermal properties of glass using thermal expansion method is 3 ℃/min;(4)The higher the B2O3 content and the lower the CaO content in glass,the higher the thermal expansion coefficient α of glass,the smaller the strain point Tst and transition point Tg of glass,the larger the annealing temperature range.
关键词
玻璃/热膨胀系数/玻璃转变点/膨胀软化点/退火Key words
glass/coefficient of thermal expansion/glass transition point/expansion softening point/annealing引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据