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Void distribution and susceptibility differences in ceramic materials using MRI

Published online by Cambridge University Press:  31 January 2011

Anton S. Wallner  and
William M. Ritchey
Anton S. Wallner
Affiliation:
Department of Chemistry, Missouri Western State College, St. Joseph, Missouri 64507
William M. Ritchey
Affiliation:
Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106-7078
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Abstract

Magnetic Resonance Imaging (MRI) is applied to porous ceramic materials to study structural properties. In ceramics, processing differences create inhomogeneous binder distribution in the materials which can cause the formation of regions with differing densities and voids. These defects can be observed with MRI using solvent permeation. Fractional porosity obtained by using image intensity measurements and weight gain due to solvent permeation can be correlated. Dark regions in the image are due to defects such as closed voids, pockets of binder, or agglomerates. Defects such as voids or agglomerates usually have different magnetic susceptibilities. This difference causes artifacts in the image. By exploiting the increase in signal loss using a gradient-echo sequence, apparent enhancement of voids in ceramics is achieved.

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Type
Articles
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Journal of Materials Research , Volume 8 , Issue 3 , March 1993 , pp. 655 - 661
Copyright
Copyright © Materials Research Society 1993

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