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Open AccessFeature PaperArticle

Liquid-Film Assisted Mechanism of Reactive Flash Sintering in Oxide Systems

Department of Materials Science and Engineering, Technion–Israel Institute of Technology, Haifa 32000, Israel
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Materials 2019, 12(9), 1494; https://doi.org/10.3390/ma12091494
Received: 11 April 2019 / Revised: 1 May 2019 / Accepted: 2 May 2019 / Published: 8 May 2019
(This article belongs to the Special Issue Athermal Field Effects in Spark Plasma Sintering and Flash Sintering )
Reactive flash sintering in oxide systems is analyzed assuming the formation of a liquid film at the particle contacts at the flash onset temperature. Formation of intermediate phases, as well as phase assemblage, are predicted upon optimal conditions of the electric field and current density. In single-phase impure oxides, the solidus and the solubility limit determine the flash onset temperature. In reacting binary systems, the composition of the liquidus determines primarily the reaction products during the cooling. In multicomponent systems, the oxide with the lowest flash temperature forms the interfacial liquid film, and the solid phase assemblage follows the equilibrium phase diagram. Examples from literature are consistent with reactive flash sintering and flash sintering assisted by a transient liquid film. View Full-Text
Keywords: reactive flash sintering; Joule heating; oxides; liquid films; phase diagrams reactive flash sintering; Joule heating; oxides; liquid films; phase diagrams
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Chaim, R.; Amouyal, Y. Liquid-Film Assisted Mechanism of Reactive Flash Sintering in Oxide Systems. Materials 2019, 12, 1494.

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