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Porous 8YSZ Ceramics Prepared with Alkali Halide Sacrificial Additives
8 mol% Y(2)O(3)-stabilized ZrO(2) (8YSZ) ceramics were prepared with KCl and LiF additions to obtain porous specimens with high skeletal density. Thermogravimetric and differential thermal analyses (TG/DTA) were carried out on 8YSZ and on 8YSZ mixed to 5 wt.% KCl or 5 wt.% LiF as sacrificial pore fo...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10180457/ https://www.ncbi.nlm.nih.gov/pubmed/37176391 http://dx.doi.org/10.3390/ma16093509 |
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author | Diaz, Julio Cesar Camilo Albornoz Muccillo, Eliana Navarro dos Santos Muccillo, Reginaldo |
author_facet | Diaz, Julio Cesar Camilo Albornoz Muccillo, Eliana Navarro dos Santos Muccillo, Reginaldo |
author_sort | Diaz, Julio Cesar Camilo Albornoz |
collection | PubMed |
description | 8 mol% Y(2)O(3)-stabilized ZrO(2) (8YSZ) ceramics were prepared with KCl and LiF additions to obtain porous specimens with high skeletal density. Thermogravimetric and differential thermal analyses (TG/DTA) were carried out on 8YSZ and on 8YSZ mixed to 5 wt.% KCl or 5 wt.% LiF as sacrificial pore formers that were thermally removed during sintering. The melting and evaporation of the alkali halides were evaluated by differential thermal analysis. Dilatometric analysis was also carried out following the same TG/DTA temperature profile with results suggesting rearrangement of the 8YSZ particles during LiF and KCl melting. The dilatometric data of 8YSZ green pellets mixed to KCl or LiF exhibited an initial expansion up to the melting of the alkali halide, followed by shrinkage due to sintering evolution with grain growth and pore elimination. The time that the alkali halide molten phase was kept during sintering was found to be an important parameter for obtaining 8YSZ-sintered specimens with specific pore content; bulk density and open porosity could then be tuned by controlling the time the alkali halide remained liquid during sintering. Scanning electron microscopy images of the pellet fracture surfaces showed pores that contributed to increasing the electrical resistivity as evaluated by impedance spectroscopy analysis. |
format | Online Article Text |
id | pubmed-10180457 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-101804572023-05-13 Porous 8YSZ Ceramics Prepared with Alkali Halide Sacrificial Additives Diaz, Julio Cesar Camilo Albornoz Muccillo, Eliana Navarro dos Santos Muccillo, Reginaldo Materials (Basel) Article 8 mol% Y(2)O(3)-stabilized ZrO(2) (8YSZ) ceramics were prepared with KCl and LiF additions to obtain porous specimens with high skeletal density. Thermogravimetric and differential thermal analyses (TG/DTA) were carried out on 8YSZ and on 8YSZ mixed to 5 wt.% KCl or 5 wt.% LiF as sacrificial pore formers that were thermally removed during sintering. The melting and evaporation of the alkali halides were evaluated by differential thermal analysis. Dilatometric analysis was also carried out following the same TG/DTA temperature profile with results suggesting rearrangement of the 8YSZ particles during LiF and KCl melting. The dilatometric data of 8YSZ green pellets mixed to KCl or LiF exhibited an initial expansion up to the melting of the alkali halide, followed by shrinkage due to sintering evolution with grain growth and pore elimination. The time that the alkali halide molten phase was kept during sintering was found to be an important parameter for obtaining 8YSZ-sintered specimens with specific pore content; bulk density and open porosity could then be tuned by controlling the time the alkali halide remained liquid during sintering. Scanning electron microscopy images of the pellet fracture surfaces showed pores that contributed to increasing the electrical resistivity as evaluated by impedance spectroscopy analysis. MDPI 2023-05-03 /pmc/articles/PMC10180457/ /pubmed/37176391 http://dx.doi.org/10.3390/ma16093509 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Diaz, Julio Cesar Camilo Albornoz Muccillo, Eliana Navarro dos Santos Muccillo, Reginaldo Porous 8YSZ Ceramics Prepared with Alkali Halide Sacrificial Additives |
title | Porous 8YSZ Ceramics Prepared with Alkali Halide Sacrificial Additives |
title_full | Porous 8YSZ Ceramics Prepared with Alkali Halide Sacrificial Additives |
title_fullStr | Porous 8YSZ Ceramics Prepared with Alkali Halide Sacrificial Additives |
title_full_unstemmed | Porous 8YSZ Ceramics Prepared with Alkali Halide Sacrificial Additives |
title_short | Porous 8YSZ Ceramics Prepared with Alkali Halide Sacrificial Additives |
title_sort | porous 8ysz ceramics prepared with alkali halide sacrificial additives |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10180457/ https://www.ncbi.nlm.nih.gov/pubmed/37176391 http://dx.doi.org/10.3390/ma16093509 |
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