Porous Alumina-Bentonite Ceramics: Effects of Fillers and Molding Technique
In porous ceramics processing, the green body shaping technique largely determines the control of the final porous structure and material properties. The study is aimed at finding affordable approaches for the shaping of two different narrow-fraction fillers: F240 electro-corundum and hollow alumina...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-01-01
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| Series: | Ceramics |
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| Online Access: | https://www.mdpi.com/2571-6131/6/1/9 |
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| author | Aleksey D. Smirnov Anastasia A. Kholodkova Viktor V. Rybalchenko Vadim P. Tarasovskii |
| author_facet | Aleksey D. Smirnov Anastasia A. Kholodkova Viktor V. Rybalchenko Vadim P. Tarasovskii |
| author_sort | Aleksey D. Smirnov |
| collection | DOAJ |
| description | In porous ceramics processing, the green body shaping technique largely determines the control of the final porous structure and material properties. The study is aimed at finding affordable approaches for the shaping of two different narrow-fraction fillers: F240 electro-corundum and hollow alumina microspheres. The results revealed the influence of accessible shaping techniques (semi-dry pressing, direct casting, and slip casting) on the structural and mechanical properties of porous alumina ceramics. The starting materials were characterized by XRD, SEM, EDX, and BET. The manufactured ceramics were studied in terms of microstructure, density, porosity, and flexural strength. Free stacking of the fillers’ particles during the direct and slip casting resulted in a higher porosity of ceramics compared with that of semi-dry pressing, while reducing its mechanical strength. Direct casting appeared preferable for ceramics with hollow microspheres because it maintained the integrity of the filler particles and preserved their inherent porosity in the ceramics. The optimal parameters for porous ceramics processing were determined as follows: pressing at 30 MPa and sintering at 1280–1320 °C with a bentonite content of 15 wt.%. In this case, the average density and open porosity of F240 samples reached 2.22 g cm<sup>−3</sup> and 40.4%, while samples containing hollow microspheres reached 2.20 g cm<sup>−3</sup> and 36.7%, respectively. |
| first_indexed | 2024-03-11T06:47:36Z |
| format | Article |
| id | doaj.art-62b29fd81b834675aa3902126ed9cb85 |
| institution | Directory Open Access Journal |
| issn | 2571-6131 |
| language | English |
| last_indexed | 2024-03-11T06:47:36Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Ceramics |
| spelling | doaj.art-62b29fd81b834675aa3902126ed9cb852023-11-17T10:14:35ZengMDPI AGCeramics2571-61312023-01-016113214510.3390/ceramics6010009Porous Alumina-Bentonite Ceramics: Effects of Fillers and Molding TechniqueAleksey D. Smirnov0Anastasia A. Kholodkova1Viktor V. Rybalchenko2Vadim P. Tarasovskii3Center of Collective Usage “High-Tech Chemical Technologies”, Moscow Polytechnical University, 107023 Moscow, RussiaChemistry Department, M.V. Lomonosov Moscow State University, 119991 Moscow, RussiaMobile Solutions Engineering Center, MIREA-Russian Technological University, 119454 Moscow, RussiaMobile Solutions Engineering Center, MIREA-Russian Technological University, 119454 Moscow, RussiaIn porous ceramics processing, the green body shaping technique largely determines the control of the final porous structure and material properties. The study is aimed at finding affordable approaches for the shaping of two different narrow-fraction fillers: F240 electro-corundum and hollow alumina microspheres. The results revealed the influence of accessible shaping techniques (semi-dry pressing, direct casting, and slip casting) on the structural and mechanical properties of porous alumina ceramics. The starting materials were characterized by XRD, SEM, EDX, and BET. The manufactured ceramics were studied in terms of microstructure, density, porosity, and flexural strength. Free stacking of the fillers’ particles during the direct and slip casting resulted in a higher porosity of ceramics compared with that of semi-dry pressing, while reducing its mechanical strength. Direct casting appeared preferable for ceramics with hollow microspheres because it maintained the integrity of the filler particles and preserved their inherent porosity in the ceramics. The optimal parameters for porous ceramics processing were determined as follows: pressing at 30 MPa and sintering at 1280–1320 °C with a bentonite content of 15 wt.%. In this case, the average density and open porosity of F240 samples reached 2.22 g cm<sup>−3</sup> and 40.4%, while samples containing hollow microspheres reached 2.20 g cm<sup>−3</sup> and 36.7%, respectively.https://www.mdpi.com/2571-6131/6/1/9porous alumina ceramicselectrocorundumhollow alumina microspherespressingdirect castingslip casting |
| spellingShingle | Aleksey D. Smirnov Anastasia A. Kholodkova Viktor V. Rybalchenko Vadim P. Tarasovskii Porous Alumina-Bentonite Ceramics: Effects of Fillers and Molding Technique Ceramics porous alumina ceramics electrocorundum hollow alumina microspheres pressing direct casting slip casting |
| title | Porous Alumina-Bentonite Ceramics: Effects of Fillers and Molding Technique |
| title_full | Porous Alumina-Bentonite Ceramics: Effects of Fillers and Molding Technique |
| title_fullStr | Porous Alumina-Bentonite Ceramics: Effects of Fillers and Molding Technique |
| title_full_unstemmed | Porous Alumina-Bentonite Ceramics: Effects of Fillers and Molding Technique |
| title_short | Porous Alumina-Bentonite Ceramics: Effects of Fillers and Molding Technique |
| title_sort | porous alumina bentonite ceramics effects of fillers and molding technique |
| topic | porous alumina ceramics electrocorundum hollow alumina microspheres pressing direct casting slip casting |
| url | https://www.mdpi.com/2571-6131/6/1/9 |
| work_keys_str_mv | AT alekseydsmirnov porousaluminabentoniteceramicseffectsoffillersandmoldingtechnique AT anastasiaakholodkova porousaluminabentoniteceramicseffectsoffillersandmoldingtechnique AT viktorvrybalchenko porousaluminabentoniteceramicseffectsoffillersandmoldingtechnique AT vadimptarasovskii porousaluminabentoniteceramicseffectsoffillersandmoldingtechnique |