Evaluation of electrical, mechanical and thermoresistance resistance of al- 0.05% cu- [0.25-0.35]% fe-0.5% si-0.6% mg with addition of (0.13)% niobium, for transport and distribution of electricity
International Journal of Development Research
Evaluation of electrical, mechanical and thermoresistance resistance of al- 0.05% cu- [0.25-0.35]% fe-0.5% si-0.6% mg with addition of (0.13)% niobium, for transport and distribution of electricity
Received 27th October, 2020; Received in revised form 29th November, 2020; Accepted 20th December, 2020; Published online 30th January, 2021
Copyright © 2021, Altino dos Santos Fonseca, Denyson Teixeira Almeida, Rogério Sousa Estevam, Adriano Aleixo Rodrigues and José Maria do Vale Quaresma. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The present work aims to study the influence of the element Niobium, under the alloy Al- 0.05% Cu- [0.25-0.35]% Fe-0.5% Si-0.6% Mg as its mechanical and electrical properties and thermoresistant characterization. The first stage of the work included tensile and resistivity tests for four specimen diameters, 2.8; 3.0; 3.8; and 4.2 mm, these diameters were reproduced cable legs used for transmission and distribution of electric energy and were produced from the casting of aluminum in “U” mold with rods of 22.0 mm in diameter, machining on lathe for 18.5 mm and cold rolling for the four diameters analyzed. The results that the diameter of 3.0mm showed both tensile strength limit (LRT) and conductivity, good performance due to the phenomenon of dynamic recovery, the modified alloy with 0.13% Nb showed good electrical, mechanical and refined grains results. It was noticed that after heat treatment at temperatures of 230 ° C / 1h and 280 ° C / 1h both the base alloy and the alloy modified with% Nb improved its electrical conductivity. The second step evaluated the thermo-resistant characterization of the alloy, following guidelines of the technical standards of COPEL and ASTM. The results allowed the characterization of the modified alloy with 0.13% Nb content, showing a loss above 10% after thermal treatment at 230 ° C / 1h and 280 ° C / 1h.
