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Flash sintering of a three‐phase alumina, spinel, and yttria‐stabilized zirconia composite
Author(s) -
Kok David,
Jha Shikhar Krishn,
Raj Rishi,
Mecartney Martha L.
Publication year - 2017
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.14818
Subject(s) - spinel , sintering , materials science , lattice constant , yttria stabilized zirconia , flash (photography) , joule heating , cubic zirconia , ceramic , composite number , phase (matter) , analytical chemistry (journal) , mineralogy , composite material , metallurgy , diffraction , chemistry , optics , physics , organic chemistry , chromatography
Three‐phase ceramic composites constituted from equal volume fractions of α‐Al 2 O 3 , MgAl 2 O 4 spinel, and cubic 8 mol% Y 2 O 3 ‐stabilized ZrO 2 (8 YSZ ) were flash‐sintered under the influence of DC electric fields. The temperature for the onset of rapid densification (flash sintering) was measured using a constant heating rate at fields of 50‐500 V/cm. The experiments were carried out by heating the furnace at a constant rate. Flash sintering occurred at a furnace temperature of 1350°C at a field of 100 V/cm, which dropped to 1150°C at a field of 500 V/cm. The sintered densities ranged from 90% to 96%. Higher electric fields inhibited grain growth due to the lowering of the flash temperature and an accelerated sintering rate. During flash sintering, alumina reacted with the spinel phase to form a high‐alumina spinel solid solution, identified by electron dispersive spectroscopy and from a decrease in the spinel lattice parameter as measured by X‐ray diffraction. It is proposed that the solid solution reaction was promoted by a combination of electrical field and Joule heating.