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Research Article

Flux potentials of local talc in low voltage electro-porcelain insulator production

Ifeanyi Uchegbulam1, Agbo Sunday Chukwuemeka2, Onyinyechi Pauline Elenwo3, Emmanuel Owoichoechi Momoh4

1Production Tech., School of Science Laboratory Technology, University of Port Harcourt, Choba, Nigeria
2Ceramics Research and Production Department, Projects Development Institute (PRODA) Enugu, Nigeria 3Physics Department, Faculty of Science, University of Port Harcourt, Choba PMB 5323, Nigeria    4Faculty of Environment Science and Economy, University of Exeter, Streatham Campus, Exeter, UK

Keywords

Abstract


Ceramic;

 Porcelain insulator;

 Talc; 

 Feldspar; 

Sintering; 

 Voltage




Increasing demand for accessories like porcelain electric insulators have continued in developing countries causing overdependence on imported products. Meanwhile, raw materials for their local production are available in commercial quantities with high firing temperature being the major challenge. Hence, the need for fluxing agents that can reduce the working temperature led to the investigation of Talc as a partial replacement of conventional Feldspar. An optimum replacement of 10% Feldspar with Talc was adopted, and this recipe showed microstructurally enriched glassy phase, primary and secondary Mullite with other crystalline phases like Cristobalite, Microcline and Albite at 1200oC with micropores evident in both the Talc and Feldspar formulations. The produced insulator fired at 1200oC offered an optimum thermal conductivity of 0.2768W/mK with reductions in water absorption, apparent porosity and linear shrinkage by 78.29%, 76.02% and 19.75% respectively with a 9.48% rise in bulk density. The electrical performance comprised Inception, Withstand and Breakdown Voltages of 10.2 kV, 14 kV and 20 kV respectively at leakage currents of 0.2 mA, 1.2 mA and 2 mA accordingly. With a withstand voltage above 11 kV and breakdown voltage below 22 kV, this pin-type porcelain insulator will find wide application in both electric substations and end user load points like commercial and residential electric power lines. The novelty lies on the fluxing and filler potentials of Talc as a locally-sourced mineral in porcelain insulator production which increases the market value of Nigerian Talc while reducing importation, costs of energy and raw materials in porcelain production.

© 2024 MIM Research Group. All rights reserved.

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