caa a22 4500 445305185 CHVBK 20180317142610.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10762-011-9797-2 doi (NATIONALLICENCE)springer-10.1007/s10762-011-9797-2 Rapid Sintering of Silica Xerogel Ceramic Derived from Sago Waste Ash Using Sub-millimeter Wave Heating with a 300GHz CW Gyrotron [Elektronische Daten] [Haji Aripin, Seitaro Mitsudo, I. Sudiana, Shinji Tani, Katsuhide Sako, Yutaka Fujii, Teruo Saito, Toshitaka Idehara, Sliven Sabchevski] In this paper, we present and discuss experimental results from a microwave sintering of a silica-glass ceramic, produced from a silica xerogel extracted from a sago waste ash. As a radiation source for the microwave heating a sub-millimeter wave gyrotron (Gyrotron FU CW I) with an output frequency of 300GHz has been used. The powders of silica xerogel have been dry pressed and then sintered at temperatures ranging from 300°C to 1500°C. The influence of the sintering temperature on the technological properties such as porosity and bulk density was studied in detail. Furthermore, X-ray diffraction (XRD) and Fourier Transform Infrared (FTIR) spectroscopy have been used in order to study the structure of the produced silica glass-ceramics. It has been found that the silica xerogel crystallizes at a temperature of 800°C, which is about 200°C lower than the one observed in the conventional process. The silica xerogel samples sintered by their irradiation with a sub-millimeter wave at 900°C for 18 minutes are fully crystallized into a silica glass-ceramic with a density of about 2.2g/cm3 and cristobalite as a major crystalline phase. The results obtained in this study allow one to conclude that the microwave sintering with sub-millimeter waves is an appropriate technological process for production of silica glass-ceramics from a silica xerogel and is characterized with such advantages as shorter times of the thermal cycle, lower sintering temperatures and higher quality of the final product. Springer Science+Business Media, LLC, 2011 Silica xerogel nationallicence Silica glass-ceramic nationallicence Cristobalite nationallicence Sago waste nationallicence Ceramic sintering nationallicence Microwave treatment nationallicence Sub-millimeter wave gyrotron nationallicence Aripin Haji Department of Physics, Faculty of Mathematics and Natural Science, University of Haluoleo, Kampus Bumi Tridharma Anduonohu, 93232, Kendari, Indonesia aut Mitsudo Seitaro Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1, 910-8507, Fukui, Japan aut Sudiana I. Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1, 910-8507, Fukui, Japan aut Tani Shinji Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1, 910-8507, Fukui, Japan aut Sako Katsuhide Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1, 910-8507, Fukui, Japan aut Fujii Yutaka Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1, 910-8507, Fukui, Japan aut Saito Teruo Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1, 910-8507, Fukui, Japan aut Idehara Toshitaka Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1, 910-8507, Fukui, Japan aut Sabchevski Sliven Lab. Plasma Physics and Engineering, Institute of Electronics of the Bulgarian Academy of Sciences, 72 Tzarigradsko Shose Blvd., 1784, Sofia, Bulgaria aut Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/6(2011-06-01), 867-876 1866-6892 32:6<867 2011 32 10762 https://doi.org/10.1007/s10762-011-9797-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10762-011-9797-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Aripin Haji Department of Physics, Faculty of Mathematics and Natural Science, University of Haluoleo, Kampus Bumi Tridharma Anduonohu, 93232, Kendari, Indonesia aut NATIONALLICENCE 700 1- Mitsudo Seitaro Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1, 910-8507, Fukui, Japan aut NATIONALLICENCE 700 1- Sudiana I. Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1, 910-8507, Fukui, Japan aut NATIONALLICENCE 700 1- Tani Shinji Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1, 910-8507, Fukui, Japan aut NATIONALLICENCE 700 1- Sako Katsuhide Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1, 910-8507, Fukui, Japan aut NATIONALLICENCE 700 1- Fujii Yutaka Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1, 910-8507, Fukui, Japan aut NATIONALLICENCE 700 1- Saito Teruo Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1, 910-8507, Fukui, Japan aut NATIONALLICENCE 700 1- Idehara Toshitaka Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1, 910-8507, Fukui, Japan aut NATIONALLICENCE 700 1- Sabchevski Sliven Lab. Plasma Physics and Engineering, Institute of Electronics of the Bulgarian Academy of Sciences, 72 Tzarigradsko Shose Blvd., 1784, Sofia, Bulgaria aut NATIONALLICENCE 773 0- Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/6(2011-06-01), 867-876 1866-6892 32:6<867 2011 32 10762 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer