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A Methodology for Estimating the Mechanical Properties of Oxides at High Temperatures
Author(s) -
Hillig William B.
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb03698.x
Subject(s) - materials science , creep , thermodynamics , oxide , diamond , melting temperature , mineralogy , chemistry , composite material , metallurgy , physics
There are few data regarding the temperature dependence of elastic and related properties of materials. This paper describes a semiquantitative basis for estimating such properties in oxide materials to temperatures even approaching their melting points. The various elastic constants are shown to correlate with the field strength of the cationic species, and on V o , the apparent atomic volume of oxygen. The value of V o is readily determined from crystallographic data. High‐temperature diamond pyramid hardness measurements are shown to correlate with V o and to provide additional information regarding the structural stability of materials at high temperature. The various refractory oxides are analyzed using these approaches, allowing identification of oxides that appear to be exceptionally strong, stiff, and creep resistant at high temperature.