caa a22 4500 477092063 CHVBK 20180405111517.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF01186043 doi (NATIONALLICENCE)springer-10.1007/BF01186043 Conventional- versus microwave-hydrothermal leaching of glass from sintered kaolinite to make porous mullite [Elektronische Daten] [Hiroaki Katsuki, Sachiko Furuta, Sridhar Komarneni] A microwave-hydrothermal treatment with 1 and 5N-NaOH solution was used at 150°C and 190°C to dissolve excess silica glass and thus make porous mullite ceramics from a fired New Zealand kaolin honeycomb. The effect of microwave-hydrothermal (M-H) treatment time on the dissolution of the glass was examined and compared to the result of conventional-hydrothermal (C-H) treatment. As expected, the rate of the dissolution of glass was faster with M-H treatment compared to C-H treatment. The dissolution of 40-43% glass was almost complete after M-H treatment in 1N-NaOH for 6 hrs at 150°C, in1N-NaOH for 3 hrs at 190°C, in5N-NaOH for 1.5 hrs at 150°C, and in 5N-NaOH for 35 minutes at 190°C. When the M-H treatment in 5N-NaOH solution at 190°C was more than 45 minutes, nonporous prismatic crystals were formed on the honeycomb and these crystals decreased the specific surface area. There were no changes in the morphology of mullite whiskers or in the structure of porous mullite body after M-H treatments in NaOH solutions compared to that of C-H treatment. The M-H treatment has been shown to be a rapid technique to prepare porous mullite ceramics from fired kaolin honey comb. Kluwer Academic Publishers, 1996 mullite nationallicence glass nationallicence kaolin honeycomb nationallicence microwave-hydrothermal nationallicence dissolution nationallicence hydrothermal nationallicence Katsuki Hiroaki Saga Ceramics Research Laboratory, 3037-7 Arita-machi, 844, Saga, Japan aut Furuta Sachiko Saga Ceramics Research Laboratory, 3037-7 Arita-machi, 844, Saga, Japan aut Komarneni Sridhar Intercollege Materials Research Laboratory, and Department of Agronomy, The Pennsylvania State University, 16802-4801, University Park, PA, USA aut Journal of Porous Materials Kluwer Academic Publishers 3/2(1996-06-01), 127-131 1380-2224 3:2<127 1996 3 10934 https://doi.org/10.1007/BF01186043 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01186043 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Katsuki Hiroaki Saga Ceramics Research Laboratory, 3037-7 Arita-machi, 844, Saga, Japan aut NATIONALLICENCE 700 1- Furuta Sachiko Saga Ceramics Research Laboratory, 3037-7 Arita-machi, 844, Saga, Japan aut NATIONALLICENCE 700 1- Komarneni Sridhar Intercollege Materials Research Laboratory, and Department of Agronomy, The Pennsylvania State University, 16802-4801, University Park, PA, USA aut NATIONALLICENCE 773 0- Journal of Porous Materials Kluwer Academic Publishers 3/2(1996-06-01), 127-131 1380-2224 3:2<127 1996 3 10934 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer