DBPapers
DOI: 10.5593/SGEM2016/B13/S05.076

REGULARITIES OF NON-UNIFORM HEATING OF THE TWO-PHASE ENVIRONMENT DURING ELECTRIC CURRENT

I. Sachkov, O. Marinova, V. Turygina, E. Turygin, A. Dolganov
Tuesday 6 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-57-5 / ISSN 1314-2704, June 28 - July 6, 2016, Book1 Vol. 3, 599-606 pp

ABSTRACT
By the method of finite elements the heating process of the micro domains of the two-phase system during the flow of electric current simulated. It is shown that formations of peaks of power of a thermal emission in certain points of the environment are possible. The process of synthesis of powder metallurgy is considered by method of a transmission of electric current. It is proposed to use the found phenomenon of Joule micro-heating for the formation of anisotropic and gradient materials.
In our work it is for the first time proposed to produce gradient materials – use of technology of a transmission of electric current. The elementary mechanism – emergence, in the process of agglomeration the crossing points lead to sedimentation of particles and formation of lamellar structures. At the same time in a case when the electro isolating phase forms a matrix, crossing points create a skeleton of coagulated particles directed along distribution of electric current. In the discussed situation it turns out, in particular, that macroscopic (effective) conductivity along the allocated axis is higher, than in the cross direction. In a reverse situation low conductive particles focused perpendicular to the direction of current are formed. In this way anisotropy of heat conductivity and mechanical properties has created. Thus, establishing the direction of current and its time character, it is possible to receive the additional mechanism of influence operational characteristics of materials of powder metallurgy.

Keywords: finite element method, computer Modelling, two-phase system