| Mechanical and Dielectric Properties of High
Temperature Coating Insulators Based on
By-Product of Algerian Kaolin |
N. Bouzidi*, M. A. Bouzidi1, K. Bouguermouh, R. O. Nunes2, N. Benabdeslem, L. Mahtout and D. Merabet
Pages : 277-283
DOI : 10.1080/0371750X.2014.926782 |
| 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 1200o and 1500oC. 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 1400o and
1500oC show that they can be considered as insulators since they exhibit a high relative permittivity (?exp) 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 (?c) considering the large difference
between ?exp, ?c and the dielectric loss of the samples. |
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