Effect of Fe2O3 content on the electrical resistivity of aluminous porcelain applied to electrical insulators. Issue 4 (March 2016)

• Record Type: Journal Article
• Authors: Piva, D.H.; Piva, R.H.; Venturini, J.; Ramon, J.; Caldas, V.; Morelli, M.R.; Bergmann, C.P.
• Is Part Of: Ceramics international. Volume 42:Issue 4(2016)
• Page Start: 5045
• Page End: 5052
• Publication Date: 2016-03
• Subjects: C. Dielectric properties -- Aluminous porcelain -- Impedance spectroscopy -- Fe2O3 -- Electrical insulators; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.12.016
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In general, the presence of Fe2 O3 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 Fe2 O3 content on the electrical resistivity of a standard aluminous porcelain widely used in insulators. The electrical resistivity for the composition with 3 wt% Fe2 O3 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% Fe2 O3 . The presence of hematite phase was considered responsible for this reduction. These results suggest that low-cost raw materials with greater Fe2 O3 content should not extensively affect the insulating properties and could therefore be used in manufacturing aluminous electrical porcelain.