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Title: Spectral analysis and temperature measurement during flash sintering under AC electric field

Abstract

In-situ diffraction experiments were used to study the change in peak profiles of 8YSZ during conventional sintering and flash sintering under AC electric field. Using calibration from a conventionally heated standard, the lattice expansion of 8YSZ under flash conditions was correlated to actual specimen temperature, indicating temperature comparable to that required for conventional sintering. At higher current densities, a temperature rise greater than 2000 °C was reached, which resulted in abnormal grain growth and temperature instability. Microstructural analysis demonstrated that finer grain size can be achieved by limiting the current in order to avoid high specimen temperatures. Experiments varying the thickness of the green compact resulted in higher heat loss due to thermal conduction and corresponding reduction in final density. A replacement to the blackbody radiation model was successfully used to fit the data and explain all effects based on Joule heating as well as provide a flash sintering processing map incorporating furnace temperature, power dissipation, and sample geometry.

Authors:
ORCiD logo [1];  [1];  [2];  [1]
  1. Rutgers Univ., Piscataway, NJ (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
US Department of the Navy, Office of Naval Research (ONR); Argonne National Laboratory, Advanced Photon Source; USDOE
OSTI Identifier:
1524600
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Materialia
Additional Journal Information:
Journal Volume: 6; Journal Issue: C; Journal ID: ISSN 2589-1529
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 8YSZ; Energy dispersive diffraction; Fast firing; Flash sintering; Processing map

Citation Formats

Charalambous, Harry, Jha, Shikhar Krishn, Okasinski, John, and Tsakalakos, Thomas. Spectral analysis and temperature measurement during flash sintering under AC electric field. United States: N. p., 2019. Web. doi:10.1016/j.mtla.2019.100273.
Charalambous, Harry, Jha, Shikhar Krishn, Okasinski, John, & Tsakalakos, Thomas. Spectral analysis and temperature measurement during flash sintering under AC electric field. United States. https://doi.org/10.1016/j.mtla.2019.100273
Charalambous, Harry, Jha, Shikhar Krishn, Okasinski, John, and Tsakalakos, Thomas. Thu . "Spectral analysis and temperature measurement during flash sintering under AC electric field". United States. https://doi.org/10.1016/j.mtla.2019.100273. https://www.osti.gov/servlets/purl/1524600.
@article{osti_1524600,
title = {Spectral analysis and temperature measurement during flash sintering under AC electric field},
author = {Charalambous, Harry and Jha, Shikhar Krishn and Okasinski, John and Tsakalakos, Thomas},
abstractNote = {In-situ diffraction experiments were used to study the change in peak profiles of 8YSZ during conventional sintering and flash sintering under AC electric field. Using calibration from a conventionally heated standard, the lattice expansion of 8YSZ under flash conditions was correlated to actual specimen temperature, indicating temperature comparable to that required for conventional sintering. At higher current densities, a temperature rise greater than 2000 °C was reached, which resulted in abnormal grain growth and temperature instability. Microstructural analysis demonstrated that finer grain size can be achieved by limiting the current in order to avoid high specimen temperatures. Experiments varying the thickness of the green compact resulted in higher heat loss due to thermal conduction and corresponding reduction in final density. A replacement to the blackbody radiation model was successfully used to fit the data and explain all effects based on Joule heating as well as provide a flash sintering processing map incorporating furnace temperature, power dissipation, and sample geometry.},
doi = {10.1016/j.mtla.2019.100273},
journal = {Materialia},
number = C,
volume = 6,
place = {United States},
year = {Thu Feb 28 00:00:00 EST 2019},
month = {Thu Feb 28 00:00:00 EST 2019}
}

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