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A model for evaluating and predicting high-temperature thermal expansion

Published online by Cambridge University Press:  31 January 2011

Kai Wang  and
Robert R. Reeber
Kai Wang
Affiliation:
Department of Geology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599–3315
Robert R. Reeber
Affiliation:
Department of Geology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599–3315
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Abstract

In this paper, a new set of experimental data, αVKTV, representing the partial temperature derivative of the work done by the thermal pressure of the solid, is fitted by n terms of a modified Einstein model. Experimental data show that αVKTV, not αVKT, approaches a constant value at high temperature. Based on the observed linear relationship of isothermal bulk modulus with temperature at high temperature, thermal expansion can be evaluated by fitting αVKTV data. Our previous results have shown that at low temperature or for materials with less variable bulk modulus and expansivity, thermal expansion data can be simply approximated by an n term Einstein model. More generally and for many materials, αVKTV data resemble an isochoric specific heat curve. With this method, thermal expansion can be predicted at high temperatures from low and intermediate temperature range data. With accurate thermal expansion data, high temperature bulk moduli can also be predicted.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 7 , July 1996 , pp. 1800 - 1803
Copyright
Copyright © Materials Research Society 1996

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