SURFACE-INDUCED DEVITRIFICATION OF GLASSES - THE INFLUENCE OF ELASTIC STRAINS

被引：87

作者：

SCHMELZER, J ^{[1
]}

PASCOVA, R ^{[1
]}

MOLLER, J ^{[1
]}

GUTZOW, I ^{[1
]}

机构：

[1] BULGARIAN ACAD SCI,BU-1040 SOFIA,BULGARIA

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 1993年 / 162卷 / 1-2期

关键词：

D O I：

10.1016/0022-3093(93)90738-J

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 influence of elastic strains on devitrification processes in glasses is investigated. It is shown that in the vicinity and below the vitrification temperature, T(g), thermodynamic inhibition of crystallization has to be taken into account in addition to kinetic inhibition of crystallization connected with the extremely low values of the mobility (large values of the viscosity). This thermodynamic inhibition results from the evolution of elastic fields due to a difference in the specific volumes of the vitreous and crystalline states of the substance. The inhibiting term is of the same order of magnitude as the thermodynamic driving force of crystallization (and may even exceed it). It is considerably diminished for devitrification at the surface of a glass. In this way, elastic strains can be considered as the origin both for the absence of bulk devitrification ard for preferential surface crystallization of glasses in systems with different specific volumes of the vitreous and crystalline states.

引用

页码：26 / 39

页数：14

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