Effect of Fe2O3 content on the electrical resistivity of aluminous porcelain applied to electrical insulators |
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| Affiliation: | 1. Federal University of São Carlos, PPG-CEM, São Carlos, SP, Brazil;2. Federal University of Rio Grande do Sul, PPGE3M, Porto Alegre, RS, Brazil;1. INFN-Sezione di Napoli, Complesso Universitario Monte, S. Angelo, via Cintia, 80126, Napoli, Italy;2. INFN-Sezione di Genova, via Dodecaneso 33, 16146, Genova, Italy;3. INFN-Sezione di Milano, Laboratorio LASA, Via F.lli Cervi, 201, 20090, Segrate, Milano, Italy;1. Institute of Particle Technology, Friedrich-Alexander-University of Erlangen-Nürnberg, Cauerstrasse 4, 91058 Erlangen, Germany;2. Chair of Chemistry of Thin Film Materials, Friedrich-Alexander-University Erlangen-Nürnberg, IZNF, Cauerstr. 3, 91058 Erlangen, Germany;1. Institut Charles Gerhardt Montpellier, Université de Montpellier, CNRS, Montpellier, France;2. Univ, Pau & Pays Adour/E2S UPPA, Institut des Sciences Analytiques et de Physicochimie pour l’Environnement et les Matériaux – UMR 5254, 64000 Pau, France;3. Université Clermont Auvergne, CNRS, Sigma Clermont, ICCF, 63000 Clermont-Ferrand, France;4. Réseau sur le Stockage Electrochimique de l’Energie (RS2E), FR CNRS 3459, 33 Rue Saint Leu, 80039 Amiens, France;1. Laboratory of Ceramic Materials, Federal University of Rio Grande do Sul, Brazil;2. Institute of Physics, Federal University of Rio Grande do Sul, Brazil |
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| Abstract: | In general, the presence of Fe2O3 is claimed to reduce the insulating behavior of electrical porcelains, even if a rigorous proof has not yet been reported. The purpose of this study was to evaluate the real influence of Fe2O3 content on the electrical resistivity of a standard aluminous porcelain widely used in insulators. The electrical resistivity for the composition with 3 wt% Fe2O3 was higher than those found for standard aluminous porcelain, which was discussed in terms of the concentration of glassy and mullite phases. A reduction in the electrical resistivity was only observed in porcelain samples containing over 3 wt% Fe2O3. The presence of hematite phase was considered responsible for this reduction. These results suggest that low-cost raw materials with greater Fe2O3 content should not extensively affect the insulating properties and could therefore be used in manufacturing aluminous electrical porcelain. |
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| Keywords: | C Dielectric properties Aluminous porcelain Impedance spectroscopy Electrical insulators |
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