The influence of the processing parameters on the reactive flash sintering of ZrO2-CeO2

Ingraci Neto, Rubens Roberto; Kardoulaki, Erofili; Valdez, James Anthony

doi:10.1111/jace.18426

Title: The influence of the processing parameters on the reactive flash sintering of ZrO₂-CeO₂

Journal Article · 18 February 2022 · Journal of the American Ceramic Society

DOI: https://doi.org/10.1111/jace.18426 · OSTI ID:1868300

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Reactive flash sintering (RFS) is a method that was recently developed to produce dense single-phase bulk ceramic parts through solid-state reactions in a single-step that only takes a few minutes. The influence of the RFS parameters on the phase purity of a simple mixed oxide, (Zr_0.8,Ce_0.2)O₂, was investigated. Parameters such as furnace temperature, furnace atmosphere, electric current density, and alternating current (AC) or direct current (DC) were examined. It was found that (Zr_0.8,Ce_0.2)O₂ pellets with high densities, above 90% of its theoretical density, can be produced by RFS in a few minutes when RFS occurs under oxidizing atmospheres, AC fields with current densities of 100 mA·mm^–2, and at a furnace temperature of 1200°C. Reducing conditions such as Ar-H₂ atmosphere and DC fields, low furnace temperatures, and low current densities resulted in phase impurities and poor reactions between the ZrO₂ and the CeO₂ powders. These results show that RFS is a useful method to produce mixed oxides, but it is very sensitive to the processing parameters. This is the first time that the influence of most of the RFS processing parameters has been studied systematically. Thus, the present work aims to provide guidelines on selecting the right processing parameters when exploring RFS.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1868300

Report Number(s):: LA-UR-21-30248

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 6 Vol. 105; ISSN 0002-7820

Publisher:: American Ceramic SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Reactive flash sintering
ZrO2-CeO2
flash sintering
mixed oxides
solid-state reactions

Title: The influence of the processing parameters on the reactive flash sintering of ZrO2-CeO2

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Title: The influence of the processing parameters on the reactive flash sintering of ZrO₂-CeO₂