Cold Extrusion of Carbon Electrodes Using Dies of CRHS Concept and Performance Analysis

Sami Ajeel, Ahmed M. Saleem, Farhad B. Bahaideen, M. Abdul Mujeebu and Hussain Alalkawi

Modern Applied Science, 2009, vol. 3, issue 3, 44

Abstract: In this article cold extrution of carbon electrodes using the direct extrusion die that is designed using one of the theoretical concepts, Constancy of the Ratio of the Successive Generalized Homogeneous Strain-increment (CRHS), is presented. On the basis of the above concept we used three types of dies that are categorized as uniform (UCRHS),accelerated (ACRHS),and decelerated (DCRH) according to the deformation rates. All dies were with fixed reduction area of 50%. The mixture used (filler with binder) was extruded in round section carbon electrodes carried out at 60oC to 80oC. Ten samples are produced and tested for properties such as electrical resistivity, hardness, density and porosity. The results show that the extrusion die UCRHS is the more efficient die design for the production of carbon electrodes.

Date: 2009
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