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Fabrication of porous (Ba,Sr)(Co,Fe)O3-delta (BSCF) ceramics using gelatinization and retrogradation phenomena of starch as pore-forming agent
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Title: | Fabrication of porous (Ba,Sr)(Co,Fe)O3-delta (BSCF) ceramics using gelatinization and retrogradation phenomena of starch as pore-forming agent |
Authors: | Ishii, Kento Browse this author | Shimizu, Makoto Browse this author | Sameshima, Haruki Browse this author | Samitsu, Sadaki Browse this author | Ishigaki, Takamasa Browse this author | Uchikoshi, Tetsuo Browse this author |
Keywords: | Porous ceramics | BSCF | Starch | Gelatinization-retrogradation phenomena |
Issue Date: | 15-Jun-2020 |
Publisher: | Elsevier |
Journal Title: | Ceramics international |
Volume: | 46 |
Issue: | 9 |
Start Page: | 13047 |
End Page: | 13053 |
Publisher DOI: | 10.1016/j.ceramint.2020.02.075 |
Abstract: | Porous (Ba,Sr)(Co,Fe)O3-delta (BSCF) ceramics with high open porosity and good electrical conductivity was fabricated using Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF), which shows a high mixed ionic-electronic conductivity. In general, during the fabrication of porous ceramics by the sacrificial template method using pore former particles, closed pores are easily formed unless sufficient pore former particles are added. In this study, we have devised a method using the gelatinization-retrogradation phenomena of starch for producing a porous body with an excellent percolated pore network structure. By dispersing BSCF and starch in an aqueous slurry (0-50% by weight) and heating, gelatinization of the starch occurred and the starch particles adhered to each other. Furthermore, in order to retain the percolated structure, the water solvent was removed by freeze-drying without heating to obtain a dried green body. The sintering behavior of the porous BSCF bodies prepared under various conditions was characterized by microstructural observations and relative density measurements. By optimizing the process conditions of the gelatinization and retrogradation, a porous body having an open porosity of 48.3%, and with 99% of the total pores open, was obtained. The matrix was also well connected and showed a sufficiently high conductivity which was similar to the porous bodies made by the traditional sacrificial template method. |
Rights: | © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
Type: | article (author version) |
URI: | http://hdl.handle.net/2115/84438 |
Appears in Collections: | 総合化学院 (Graduate School of Chemical Sciences and Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 打越 哲郎
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