Structural and Microwave Properties of Silica Xerogel Glass-Ceramic Sintered by Sub-millimeter Wave Heating using a Gyro
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Structural and Microwave Properties of Silica Xerogel Glass-Ceramic Sintered by Sub-millimeter Wave Heating using a Gyrotron H. Aripin & S. Mitsudo & E. S. Prima & I. N. Sudiana & S. Tani & K. Sako & Y. Fujii & T. Saito & T. Idehara & S. Sano & B. Sunendar & S. Sabchevski
Received: 23 May 2012 / Accepted: 29 June 2012 / Published online: 7 July 2012 # Springer Science+Business Media, LLC 2012
Abstract In this paper, we present and discuss experimental results from a microwave sintering of silica glass-ceramics, produced from amorphous silica xerogel extracted from sago waste ash. As a radiation source for a microwave heating a sub-millimeter wave gyrotron (Gyrotron FU CW I) with an output frequency of 300 GHz has been used. The powders of the amorphous silica xerogel have been dry pressed and then sintered at temperatures ranging from 300 °C to 1200 °C. Microwave absorbing properties of the sintered samples were investigated by measuring the dielectric constant, the dielectric loss, and the reflection loss at different frequencies in the interval from 8.2 to 12.4 GHz. Furthermore, the characteristics of the formation process for producing silica glassceramics were studied using a Raman Spectroscopy and a Scanning Electron Microscopy (SEM). The results indicate that the samples sintered at 1200 °C are characterized by lower H. Aripin (*) Department of Physics, Faculty of Mathematics and Natural Science, University of Haluoleo, Kampus Bumi Tridharma Anduonohu, Kendari 93232, Indonesia e-mail: [email protected] S. Mitsudo : I. N. Sudiana : S. Tani : K. Sako : Y. Fujii : T. Saito : T. Idehara : S. Sabchevski Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1, Fukui 910-8507, Japan E. S. Prima Department of Chemistry, Faculty of Mathematics and Natural Science, University of Haluoleo, Kendari, Indonesia S. Sano Ceramic Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya, Japan B. Sunendar Department of Physics Engineering, Faculty of Industry Technology, Bandung Institute of Technology, Bandung, Indonesia S. Sabchevski Lab. Plasma Physics and Engineering, Institute of Electronics of the Bulgarian Academy of Sciences, 72 Tzarigradsko Shose Blvd, Sofia 1784, Bulgaria
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J Infrared Milli Terahz Waves (2012) 33:1149–1162
reflection losses and a better transparency due to the formation of a fully crystallized silica glass- ceramic at sufficiently high temperature. Keywords Sub-millimeter waves . Gyrotron . Microwave processing . Ceramic sintering . Silica xerogel . Silica glass-ceramic . Sago waste . Microwave absorptivity 1 Introduction Silica materials are characterized by some specific properties such as a low bulk density, a very high specific surface area, and a low thermal conductivity. These advantageous features make them appropriate raw materials for production of glasses and ceramics, which have numerous applications in various industrial processes and technical devices [1–3]. Among them are those related to the developm
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