Volume 6, No. 1, March 2018
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Volumetric Microwave Heating of Mullite Ceramic Using a 28 GHz Gyrotron

H. Aripin1, S. Mitsudo2, I. N. Sudiana 3, B. Nundang1, S. Sabchevski 4
1. Department of Electrical Engineering, Faculty of Engineering, Siliwangi University, Jl. Siliwangi 24, Tasikmalaya 46115, Indonesia.
2. Research Center for Development of Far Infrared Region, University of Fukui, Bunkyo 3-9-1 Fukui 910-8507, Japan.
3. Department of Physics, Faculty of Mathematics and Natural Sciences, Haluoleo University, Kampus Bumi Tridharma, Anduonohu, Kendari 93232, Indonesia.
4. Lab. Plasma Physics and Engineering, Institute of Electronics of the Bulgarian Academy of Sciences, 72 Tzarigradsko Shose Blvd., Sofia 1784, Bulgaria.
Abstract: In this paper, we present and discuss experimental results from a microwave sintering of a mullite ceramic, produced from a mixture of alumina and silica xerogel extracted from a sago waste ash. The composition has been prepared by adding 60 %wt amount of alumina into the silica xerogel. As a radiation source for the microwave heating, a 28 GHz wave gyrotron has been used. The influence of the sintering temperature on the structural properties was studied in detail. It has been found that the mixture crystallizes completely as a single mullite phase at a temperature of 1600°C after heating for 10 min at a temperature rate of 45oC/min. Most importantly, such result cannot be achieved by conventional heating. The results that have been obtained in this study allow one to conclude that the microwave sintering of using a 28 GHz gyrotron is an appropriate technological process for the production of mullite ceramics and is characterized by several advantages such as shorter times of the thermal cycle, lower sintering temperatures and higher quality of the final product.
Keywords: Alumina, silica xerogel, sago waste, mullite, microwave heating, gyrotron.

Cite:H. Aripin, S. Mitsudo, I. N. Sudiana, B. Nundang, S. Sabchevski, "Volumetric Microwave Heating of Mullite Ceramic Using a 28 GHz Gyrotron," International Journal of Materials Science and Engineering, Vol. 6, No. 1, pp. 32-38, March 2018. doi: 10.17706/ijmse.2018.6.1.32-38

General Information

ISSN: 2315-4527 (Print)
Abbreviated Title: Int. J. Mater. Sci. Eng.
Editor-in-Chief: Prof. Emeritus Dato' Dr. Muhammad Yahaya
DOI: 10.17706/ijmse
Abstracting/ Indexing: Ulrich's Periodicals Directory, Google Scholar, Crossref
E-mail: ijmse@iap.org