Sintering Kinetics of a MgAl2O4 Spinel Doped with LiF |
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| Authors: | Keith Rozenburg Ivar E Reimanis Hans-Joachim Kleebe Ron L Cook |
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| Affiliation: | Metallurgical and Materials Engineering, Colorado School of Mines, Golden, Colorado 80401;
Institut für Angewandte Geowissenschaften, Geomaterialwissenschaft, Technische Universität Darmstadt, 64287 Darmstadt, Germany;
TDA Research Inc., Arvada, Colorado 80033 |
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| Abstract: | The sintering kinetics of a pure magnesium aluminate spinel, MgAl2O4, and that doped with LiF were determined through the use of the master sintering curve technique developed by Su and Johnson. 20 Powders with 0%, 0.5%, and 1.0% by mass LiF were densified in a vacuum hot press under a range of unaxial pressures. After the sintering mechanisms in each temperature and pressure regime were determined, an optimized vacuum hot-pressing schedule was formulated for spinel powders doped with 1.0% by mass of LiF. In addition to forming a transient liquid phase, the presence of LiF leads to the formation of oxygen vacancies that promote late-stage sintering in MgAl2O4. |
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