Effect of cooling rate on the microstructure and porosity of alumina produced by freeze casting
Freeze casting is a well-known shaping technique to produce materials with directional porosity. One of the major problems is the difficulty to control the cooling rate thus leading to gradients in pore size and homogeneity. This work deals with the manufacture of alumina ceramics with directiona...
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| Format: | Article |
| Language: | English |
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Serbian Chemical Society
2012-01-01
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| Series: | Journal of the Serbian Chemical Society |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0352-5139/2012/0352-51391200132R.pdf |
| _version_ | 1811261896001585152 |
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| author | Nieto Isabel María Rodríguez-Parra Jesús M. Moreno Rodrigo |
| author_facet | Nieto Isabel María Rodríguez-Parra Jesús M. Moreno Rodrigo |
| author_sort | Nieto Isabel María |
| collection | DOAJ |
| description | Freeze casting is a well-known shaping technique to produce materials with directional porosity. One of the major problems is the difficulty to control the cooling rate thus leading to gradients in pore size and homogeneity. This work deals with the manufacture of alumina ceramics with directional porosity by freeze casting of aqueous suspensions. An experimental set-up was prepared in order to apply different cooling rates. Freeze casting tests were done with an aqueous alumina suspension after optimization of its rheological behavior. The porosity and microstructural features of sintered bodies produced under different experimental conditions were studied and analyzed. It is concluded that the cooling rate influences the microstructure while final temperature has a much lower influence. Also, the microstructural analysis shows that there is a gradient in the directionality of pores, being lower at the bottom and the top and higher in the central region of the specimens. |
| first_indexed | 2024-04-12T19:14:07Z |
| format | Article |
| id | doaj.art-deb908962f98480f9a72f08c29768926 |
| institution | Directory Open Access Journal |
| issn | 0352-5139 |
| language | English |
| last_indexed | 2024-04-12T19:14:07Z |
| publishDate | 2012-01-01 |
| publisher | Serbian Chemical Society |
| record_format | Article |
| series | Journal of the Serbian Chemical Society |
| spelling | doaj.art-deb908962f98480f9a72f08c297689262022-12-22T03:19:48ZengSerbian Chemical SocietyJournal of the Serbian Chemical Society0352-51392012-01-0177121775178510.2298/JSC121018132REffect of cooling rate on the microstructure and porosity of alumina produced by freeze castingNieto Isabel MaríaRodríguez-Parra Jesús M.Moreno RodrigoFreeze casting is a well-known shaping technique to produce materials with directional porosity. One of the major problems is the difficulty to control the cooling rate thus leading to gradients in pore size and homogeneity. This work deals with the manufacture of alumina ceramics with directional porosity by freeze casting of aqueous suspensions. An experimental set-up was prepared in order to apply different cooling rates. Freeze casting tests were done with an aqueous alumina suspension after optimization of its rheological behavior. The porosity and microstructural features of sintered bodies produced under different experimental conditions were studied and analyzed. It is concluded that the cooling rate influences the microstructure while final temperature has a much lower influence. Also, the microstructural analysis shows that there is a gradient in the directionality of pores, being lower at the bottom and the top and higher in the central region of the specimens.http://www.doiserbia.nb.rs/img/doi/0352-5139/2012/0352-51391200132R.pdfsuspensionsshapingceramicsporous materialsaluminamicro-structures |
| spellingShingle | Nieto Isabel María Rodríguez-Parra Jesús M. Moreno Rodrigo Effect of cooling rate on the microstructure and porosity of alumina produced by freeze casting Journal of the Serbian Chemical Society suspensions shaping ceramics porous materials alumina micro-structures |
| title | Effect of cooling rate on the microstructure and porosity of alumina produced by freeze casting |
| title_full | Effect of cooling rate on the microstructure and porosity of alumina produced by freeze casting |
| title_fullStr | Effect of cooling rate on the microstructure and porosity of alumina produced by freeze casting |
| title_full_unstemmed | Effect of cooling rate on the microstructure and porosity of alumina produced by freeze casting |
| title_short | Effect of cooling rate on the microstructure and porosity of alumina produced by freeze casting |
| title_sort | effect of cooling rate on the microstructure and porosity of alumina produced by freeze casting |
| topic | suspensions shaping ceramics porous materials alumina micro-structures |
| url | http://www.doiserbia.nb.rs/img/doi/0352-5139/2012/0352-51391200132R.pdf |
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