Porous 8YSZ Ceramics Prepared with Alkali Halide Sacrificial Additives
8 mol% Y<sub>2</sub>O<sub>3</sub>-stabilized ZrO<sub>2</sub> (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 o...
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2023-05-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/9/3509 |
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| author | Julio Cesar Camilo Albornoz Diaz Eliana Navarro dos Santos Muccillo Reginaldo Muccillo |
| author_facet | Julio Cesar Camilo Albornoz Diaz Eliana Navarro dos Santos Muccillo Reginaldo Muccillo |
| author_sort | Julio Cesar Camilo Albornoz Diaz |
| collection | DOAJ |
| description | 8 mol% Y<sub>2</sub>O<sub>3</sub>-stabilized ZrO<sub>2</sub> (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. |
| first_indexed | 2024-03-11T04:14:14Z |
| format | Article |
| id | doaj.art-7b51219b35dd41ecae46a33bbd4b98fe |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T04:14:14Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
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| spelling | doaj.art-7b51219b35dd41ecae46a33bbd4b98fe2023-11-17T23:17:03ZengMDPI AGMaterials1996-19442023-05-01169350910.3390/ma16093509Porous 8YSZ Ceramics Prepared with Alkali Halide Sacrificial AdditivesJulio Cesar Camilo Albornoz Diaz0Eliana Navarro dos Santos Muccillo1Reginaldo Muccillo2Center of Science and Technology of Materials—CCTM, Energy and Nuclear Research Institute—IPEN, Sao Paulo 05508-170, SP, BrazilCenter of Science and Technology of Materials—CCTM, Energy and Nuclear Research Institute—IPEN, Sao Paulo 05508-170, SP, BrazilCenter of Science and Technology of Materials—CCTM, Energy and Nuclear Research Institute—IPEN, Sao Paulo 05508-170, SP, Brazil8 mol% Y<sub>2</sub>O<sub>3</sub>-stabilized ZrO<sub>2</sub> (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.https://www.mdpi.com/1996-1944/16/9/3509yttria-stabilized zirconiaalkali halide pore formersthermal analysisimpedance spectroscopy |
| spellingShingle | Julio Cesar Camilo Albornoz Diaz Eliana Navarro dos Santos Muccillo Reginaldo Muccillo Porous 8YSZ Ceramics Prepared with Alkali Halide Sacrificial Additives Materials yttria-stabilized zirconia alkali halide pore formers thermal analysis impedance spectroscopy |
| 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 | yttria-stabilized zirconia alkali halide pore formers thermal analysis impedance spectroscopy |
| url | https://www.mdpi.com/1996-1944/16/9/3509 |
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