Semi-Conducting Glazes Based on Cassiterite Crystalline
Phase for Porcelain Insulators Applications: Phase
Evolution, Microstructure and Electrical Properties |
Mehdi Kheirkhah Gareh Bolagh,1 Bijan Eftekhari Yekta1 and Sara Banijamali2, *
Pages : 227-231
DOI : 10.1080/0371750X.2019.1696234 |
Abstract |
Two series of semi-conducting glazes based on cassiterite phase were prepared and
characterized after application on electrical porcelain bodies. In one series,
semi-conducting fraction of the final glazes was calcined, then added to the base
glaze. In another series, semi-conducting fraction of the studied glazes was
precipitated in-situ during firing. Morphology of cassiterite and its optimized content
in the studied glazes were found as the most important parameter affecting electrical
properties of final glazes. Maximum amount of cassiterite was achieved for the first
series containing whole calcined semi-conducting constituent. Band gap of this glaze
was found to be 2-2.6 eV. Surface resistance of insulator bodies coated with cassiterite
based semi-conducting glazes was obtained 105-107 times more than that of the
common glazes, indicating a uniform charge distribution and inhibition of partial
discharge through surface of insulator.
[Keywords: Semi-conducting glaze, Cassiterite, Porcelain insulators, Electrical
properties] |
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