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Effect of Electric Field/Current on Liquid Phase Sintering
Author(s) -
GonzalezJulian Jesus,
Guillon Olivier
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13571
Subject(s) - sintering , joule heating , electric field , materials science , electric current , phase (matter) , viscosity , composite material , joule effect , current (fluid) , liquid phase , electric heating , electrical engineering , thermodynamics , chemistry , physics , organic chemistry , quantum mechanics , engineering
The sintering behavior of alumina containing different amounts of calcium–aluminum–silicate glass as sintering aid was analyzed under AC electric fields between 0 and 150 V/cm. Liquid phase sintering was enhanced by the electric field, and “flash sintering” behavior depending on the current density and power dissipation within the specimen could be observed. Current flowed only through the liquid phase at high temperature and enhanced the densification process by two effects: Joule heating and athermal response of the viscous liquid under the electric field. Joule heating increased the temperature within the specimen, whereas the applied electric field reduced the viscosity of the liquid phase promoting a more effective matter transport.