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- Title
Forming and sintering of porous calcium-hexaaluminate ceramics with hydraulic alumina.
- Authors
Nagaoka, T.; Tsugoshi, T.; Hotta, Y.; Yasuoka, M.; Watari, K.
- Abstract
We have developed a new eco-friendly fabrication process for porous ceramics using hydraulic alumina (HA) and water. In the present study, we fabricated porous calcium-hexaaluminate (CaAl12O19, CA6) ceramics using this new process. A boehmite gel 3-D network was formed by the hydration of HA in HA/CaCO3 mixed slurry. The HA/CaCO3 mixed slurry was hardened by the formation of this 3-D network. Even without the addition of an organic binder, green bodies containing the 3-D network demonstrated high compressive strength and retained their original shapes. Furthermore, the water acted as a fugitive material in the green bodies. Consequently, the open porosity of the CA6 ceramics could be controlled over a wide range of 42–62.7% by the addition of water (ratio of water to HA/CaCO3 mixed powder: 0.4 to 1.6 by weight) without the use of organic fugitive materials. The results of evolved gas analysis-mass spectrometry measurements showed that the emissions from the hardened green body consisted mostly of water. Consequently, the new fabrication process for porous calcium-hexaaluminate ceramics was confirmed to be eco-friendly.
- Subjects
CERAMICS; ALUMINA brick; POROUS materials; BOEHMITE; HYDRATION; SLURRY; POROSITY; MASS spectrometry
- Publication
Journal of Materials Science, 2006, Vol 41, Issue 22, p7401
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-006-0799-8