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Phenomenological analysis of densification mechanism during spark plasma sintering of MgAl2O4
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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2009 (English)In: Journal of Materials Research, ISSN 0884-2914, Vol. 24, no 6, 2011-2020 p.Article in journal (Refereed) Published
Abstract [en]

Spark plasma sintering (SPS) of MgAl2O4 powder was investigated at temperatures between 1200 and 1300 degrees C. A significant grain growth was observed during densification. The densification rate always exhibits at least one strong minimum, and resumes after an incubation period. Transmission electron microscopy investigations performed on sintered samples never revealed extensive dislocation activity in the elemental grains. The densification mechanism involved during SPS was determined by anisothermal (investigation of the heating stage of a SPS run) and isothermal methods (investigation at given soak temperatures). Grain-boundary sliding, accommodated by an in-series {interface-reaction/lattice diffusion of the O-2(-) anions} mechanism controlled by the interface-reaction step, governs densification. The zero-densification-rate period, detected for all soak temperatures, arise from the difficulty of annealing vacancies, necessary for the densification to proceed. The detection of atomic ledges at grain boundaries and the modification of the stoichiometry of spinel during SPS could be related to the difficulty to anneal vacancies at temperature soaks.

Place, publisher, year, edition, pages
2009. Vol. 24, no 6, 2011-2020 p.
Keyword [en]
magnesium-aluminate spinel, space-charge, diffusion, kinetics, flow, microanalysis, nitride, path, mg
National Category
Environmental Sciences
URN: urn:nbn:se:su:diva-60069DOI: 10.1557/JMR.2009.0243ISI: 000267207900016OAI: diva2:433134
authorCount :6Available from: 2011-08-09 Created: 2011-08-08 Last updated: 2011-08-09Bibliographically approved

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Nygren, Mats
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