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Int. J. Electroactive Mater. 2 (2014) 1-3

Enhanced%20Electromagnetic%20Absorption%20on%20Formulated%20SiC-Al2O3%20Composite%20Crucible

M.A. Sulaiman1, S.D. Hutagalung2, Z.A. Ahmad3, M. Mohamed1, M. Yusof1, S. Mamat1

1Faculty Earth Science, Universiti Malaysia Kelantan, Jeli, Kelantan, Malaysia
2Physics Department,, Faculty of Science, Jazan University, Jazan City, Jizan, Saudi Arabia
3School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia

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Abstract : Energy consumption is very essential nowadays and industries are searching for alternative solutions to save energy and optimize production of their goods or services. Currently high-temperature firing using heating filament is widely practised in solidifing green bodies and enhancing mechanical properties of ceramic products. Heating filament method consumes higher energy compared to microwave heating which is better in efficiency and environmental friendly. Triggering microwave heating requires microwave susceptor crucible for energy convertion and this strongly depends on the susceptibility of the constituted materials. Instead of SiC which has higher melting point for casting, the composite of SiC-Al2O3 also offers high susceptibility properties and can be formed at low temperature. Composite of SiC-Al2O3 was studied at different concentration (30, 40, 50, 60, 70 wt.% SiC). Slip casting processing method was applied, and 40 wt.% SiC-Al2O3 crucible was found that to have high electromagnetic wave absorption which produced higher heat (350ËšC) within 10 minutes of microwave rays. Impedance spectroscopic measurement also supported that 40 wt.% SiC-Al2O3 has the highest dielectric loss at all measured frequency. The concentration of 40 wt.% of SiC-Al2O3 is suitable for crucible formation as microwave heating application.

Keywords : Microwave heating,crucible,absorption,ceramic composit