Details

Title

The Influence of Mg Additive on the Structure and Electrical Conductivity of Pure Copper Castings

Journal title

Archives of Foundry Engineering

Yearbook

2017

Numer

No 4

Keywords

Industrial and Manufacturing Engineering ; Metals and Alloys

Divisions of PAS

Nauki Techniczne

Abstract

<jats:title>Abstract</jats:title><jats:p>The aim of this paper was to attain defect free, pure copper castings with the highest possible electrical conductivity. In this connection, the effect of magnesium additives on the structure, the degree of undercooling (ΔTα = Tα-Tmin, where Tα - the equilibrium solidification temperature, Tmin - the minimum temperature at the beginning of solidification), electrical conductivity, and the oxygen concentration of pure copper castings have been studied. The two magnesium doses have been investigated; namely 0.1 wt.% and 0.2 wt.%. A thermal analysis was performed (using a type-S thermocouple) to determine the cooling curves. The degree of undercooling and recalescence were determined from the cooling and solidification curves, whereas the macrostructure characteristics were conducted based on a metallographic examination. It has been shown that the reaction of Mg causes solidification to transform from exogenous to endogenous. Finally, the results of electrical conductivity have been shown as well as the oxygen concentration for the used Mg additives.</jats:p>

Publisher

The Katowice Branch of the Polish Academy of Sciences

Date

2017

Identifier

ISSN 2299-2944

DOI

10.1515/afe-2017-0135

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