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Fabrication and Properties of Mullite Ceramics from Ranong Kaolin

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Abstract:

In the present study, mullite powders were prepared from fired Ranong kaolin powder at high temperatures. Differential thermal analyses and X-ray diffraction (XRD) technique were used to understand kaolin–mullite reaction sequence and phase formation of the starting material after a heat treatment, respectively. It was found that phase of mullite started to occure at ∼1000 °C. Microstrural study by a scanning microscope, indicated that there was a change in microsture after the heat treatment, i.e. grain shape changed from equiaxed to needle grains shape . The AC conductivity decreased with decreasing the sintering temperature and 1500 °C ceramic presented a very high frequency stabilty of conductivity, suggesting that this martial can be used as an electrical insulator for wide frequency range.

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Material and Manufacturing Technology VII View Preview

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Periodical:

Materials Science Forum (Volume 872)

Pages:

92-96

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.872.92

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Online since:

September 2016

Authors:

Narumon Lertcumfu, Sukum Eitssayeam, Kamonpan Pengpat, Tawee Tunkasiri*, Denis Russell Sweatman, Pharatree Jaita, Ratabongkot Sanjoom, Gobwute Rujijanagul

Keywords:

Dielectric, Electrical Insulation, Kaolin, Mullite

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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