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Materials 2016, 9(4), 280; doi:10.3390/ma9040280

Liquid Film Capillary Mechanism for Densification of Ceramic Powders during Flash Sintering

Department of Materials Science and Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
Academic Editor: Eugene A. Olevsky
Received: 21 March 2016 / Revised: 6 April 2016 / Accepted: 7 April 2016 / Published: 11 April 2016
View Full-Text   |   Download PDF [533 KB, uploaded 11 April 2016]   |  

Abstract

Recently, local melting of the particle surfaces confirmed the formation of spark and plasma during spark plasma sintering, which explains the rapid densification mechanism via liquid. A model for rapid densification of flash sintered ceramics by liquid film capillary was presented, where liquid film forms by local melting at the particle contacts, due to Joule heating followed by thermal runaway. Local densification is by particle rearrangement led by spreading of the liquid, due to local attractive capillary forces. Electrowetting may assist this process. The asymmetric nature of the powder compact represents an invasive percolating system. View Full-Text
Keywords: flash sintering; spark plasma sintering; densification; melting; electric field; electric conductivity; ceramics; invasion percolation flash sintering; spark plasma sintering; densification; melting; electric field; electric conductivity; ceramics; invasion percolation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chaim, R. Liquid Film Capillary Mechanism for Densification of Ceramic Powders during Flash Sintering. Materials 2016, 9, 280.

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