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The fabrication of near net-shaped spinel bodies by the oxidative transformation of Mg/Al2O3 precursors

Published online by Cambridge University Press:  31 January 2011

P. Kumar  and
K. H. Sandhage
P. Kumar
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
K. H. Sandhage
Affiliation:
Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
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Abstract

The feasibility of transforming shaped Mg–Al2O3-bearing precursors into monolithic spinel (MgAl2O4) bodies with a retention of shape and dimensions has been demonstrated.Dense, shaped precursors (disks, bars) were fabricated by the pressureless infiltration of molten Mg into porous Al2O3 preforms. After solidification (and machining, in the case of bar-shaped specimens), the Mg-bearing precursors were oxidized in flowing O2 (g) at 430–700 °C. Postoxidation annealing at 1200 °C resulted in the conversion of MgO and Al2O3 into MgAl2O4. After sintering at 1700 °C, spinel bodies that retained the precursor dimensions (to within 0.65%) were produced. Phase and microstructural analyses at various stages of processing are discussed.

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Articles
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Journal of Materials Research , Volume 13 , Issue 12 , December 1998 , pp. 3423 - 3435
Copyright
Copyright © Materials Research Society 1998

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