Evaluation of ultrasonically determined elasticity-porosity relations in zinc oxide

Journal Article · Wed May 01 04:00:00 EDT 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb08585.x· OSTI ID:253567

Martin, L P; Dadon, D; Rosen, M ^[1]

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1. Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Materials Science and Engineering

Ultrasonically determined elastic moduli in ZnO samples sintered to various densities were evaluated using both an empirical model and the Mori-Tanaka effective field theory. Both approaches have been successfully used to model the modulus-porosity relations in several material systems. In the present investigation, application of the empirical model predicted elastic moduli which deviated significantly from the experimental results. The deviation was attributed to the porosity dependence of Poisson`s ratio which was neglected in this model. When this dependence was accounted for empirically, the fit to the experimental data was improved dramatically. Analysis of the data in the context of the Mori-Tanaka model indicates that the porosity shape changes significantly during the sintering process. This analysis may provide a convenient way to quantitatively compare such changes for ceramic materials prepared by different processing techniques, such as by conventional and microwave sintering.

• Sponsoring Organization: USDOE
• DOE Contract Number: FG02-94ER12140
• OSTI ID: 253567
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 5 Vol. 79; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BULK DENSITY
ELASTICITY
MATHEMATICAL MODELS
MICROWAVE HEATING
OPTIMIZATION
POISSON RATIO
POROSITY
SINTERING
STRESSES
ULTRASONIC WAVES
VELOCITY
YOUNG MODULUS
ZINC OXIDES