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Forming and sintering of porous calcium-hexaaluminate ceramics with hydraulic alumina

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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.

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Authors and Affiliations

  1. National Institute of Advanced Industrial Science and Technology (AIST) Chubu, 2266-98, Anagahora, Shimoshidami, Moriyama-ku, Nagoya, 463-8560, Japan

    T. Nagaoka, T. Tsugoshi, Y. Hotta, M. Yasuoka & K. Watari

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  1. T. Nagaoka
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  2. T. Tsugoshi
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  3. Y. Hotta
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  4. M. Yasuoka
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  5. K. Watari
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Correspondence to T. Nagaoka.

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Nagaoka, T., Tsugoshi, T., Hotta, Y. et al. Forming and sintering of porous calcium-hexaaluminate ceramics with hydraulic alumina. J Mater Sci 41, 7401–7405 (2006). https://doi.org/10.1007/s10853-006-0799-8

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  • DOI: https://doi.org/10.1007/s10853-006-0799-8

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