Flash sintering of a three‐phase alumina, spinel, and yttria‐stabilized zirconia composite
Abstract
Abstract 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.
- Authors:
-
[1];
- Department of Chemical Engineering and Material Science University of California Irvine California
- Department of Mechanical Engineering University of Colorado at Boulder Boulder Colorado
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1400834
- Grant/Contract Number:
- DE‐NE0000711
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Journal of the American Ceramic Society
- Additional Journal Information:
- Journal Name: Journal of the American Ceramic Society Journal Volume: 100 Journal Issue: 7; Journal ID: ISSN 0002-7820
- Publisher:
- Wiley-Blackwell
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Kok, David, Jha, Shikhar Krishn, Raj, Rishi, and Mecartney, Martha L. Flash sintering of a three‐phase alumina, spinel, and yttria‐stabilized zirconia composite. United States: N. p., 2017.
Web. doi:10.1111/jace.14818.
Kok, David, Jha, Shikhar Krishn, Raj, Rishi, & Mecartney, Martha L. Flash sintering of a three‐phase alumina, spinel, and yttria‐stabilized zirconia composite. United States. https://doi.org/10.1111/jace.14818
Kok, David, Jha, Shikhar Krishn, Raj, Rishi, and Mecartney, Martha L. Sun .
"Flash sintering of a three‐phase alumina, spinel, and yttria‐stabilized zirconia composite". United States. https://doi.org/10.1111/jace.14818.
@article{osti_1400834,
title = {Flash sintering of a three‐phase alumina, spinel, and yttria‐stabilized zirconia composite},
author = {Kok, David and Jha, Shikhar Krishn and Raj, Rishi and Mecartney, Martha L.},
abstractNote = {Abstract 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.},
doi = {10.1111/jace.14818},
journal = {Journal of the American Ceramic Society},
number = 7,
volume = 100,
place = {United States},
year = {Sun Apr 09 00:00:00 EDT 2017},
month = {Sun Apr 09 00:00:00 EDT 2017}
}
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