Studies on the Process of Heat Treatment of Conductive AlZr Alloys Obtained in Various Productive Processes

Abstract

A novelty in electroenergetics of the recent years are anti-blackout conductors of the HTLS type. These conductors allow for an above average increase of the transmission capacity of electric energy through overhead lines. The high temperature work of such conductor is possible with the use of thermally resistant aluminium alloys with the addition of zirconium. Compared to the traditionally applied material of the EN AW 1370 class, those alloys' permissible work temperature is at the level of 150 to 230 C (aluminium 80 C). The production technology for the alloys of this type includes a line of continuous casting and rolling of the wire rod, and next, its long-term heat treatment. The aim of the process of the heating of the wire rod is obtaining the desired level of the material's properties, which will make it possible to obtain the final properties of the wires assigned for the creation of conductors. The paper presents the results of the studies aiming at the description of the influence of the heat treatment of the material obtained in various production process conditions on its mechanical and electric properties.