Reactive flash sintering: MgO and α‐Al2O3 transform and sinter into single‐phase polycrystals of MgAl2O4

We show that flash experiments with three phase mixed‐powders of yttria‐stabilized zirconia (8YSZ), MgO, and α‐Al2O3 not only produce polycrystals of high density, but also the transformation of magnesia and alumina into single‐phase spinel. The presence of zirconia facilitates the onset of the flas...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2019-05, Vol.102 (5), p.2294-2303
Main Authors: Yoon, Bola, Yadav, Devinder, Ghose, Sanjit, Raj, Rishi
Format: Article
Language:English
Subjects:
Aluminum oxide
Bismuth ferrite
Experiments
Iron constituents
Laboratories
Magnesium oxide
MATERIALS SCIENCE
Phase transitions
Polycrystals
Resistance sintering
Sintering
Spinel
Synthesis
Time dependence
Yttrium oxide
Zirconium dioxide
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Summary:We show that flash experiments with three phase mixed‐powders of yttria‐stabilized zirconia (8YSZ), MgO, and α‐Al2O3 not only produce polycrystals of high density, but also the transformation of magnesia and alumina into single‐phase spinel. The presence of zirconia facilitates the onset of the flash. The sintering experiments in the laboratory were extended to live experiments at the National Synchrotron Light Source II at Brookhaven National Laboratory in order to measure the time‐dependent evolution of single‐phase spinel. The phase transformation occurred in
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.15974