Mechanical and Dielectric Properties of High Temperature Coating Insulators Based on By-Product of Algerian Kaolin (original) (raw)

Transactions of the Indian Ceramic Society, 2014

Abstract

ABSTRACT The main objective of this work is to study the mechanical and dielectric properties of high temperature coating insulators based on the by-product resulted from the raw kaolin treatment; this by-product represents about 21 wt% of the kaolin as commercial products. During sintering, the mineralogical phases are mainly mullite, quartz and vitreous silica besides rutile phase which is identified only at 1200° and 1500°C. The sample porosity decreases from 21% to 16%. Mechanical properties carried out by Young's modulus values are enhanced during calcinations from 54 to 57 GPa. Dielectric properties, in the frequency range of 105-109 Hz, of the samples fired at 1400° and 1500°C show that they can be considered as insulators since they exhibit a high relative permittivity (εexp) varying from 6.95 to 7.89 respectively. These parameters depend on glassy, quartz and mullite phases besides porous structures. Porosity affects considerably both the corrected relative permittivity (εc) considering the large difference between εexp, εc and the dielectric loss of the samples.

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