The fabrication of near net-shaped spinel bodies by the oxidative transformation of Mg/Al2O3 precursors
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. A...
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| Published in: | Journal of materials research Vol. 13; no. 12; pp. 3423 - 3435 |
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| Main Authors: | , |
| Format: | Journal Article |
| Language: | English |
| Published: |
New York, USA
Cambridge University Press
01-12-1998
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| Online Access: | Get full text |
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| Summary: | 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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| Bibliography: | istex:81B7785BDD14C0811184723751768D53DDCFA982 ark:/67375/6GQ-VB6CRS2W-C ArticleID:04680 PII:S088429140004680X ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
| ISSN: | 0884-2914 2044-5326 |
| DOI: | 10.1557/JMR.1998.0466 |