Modelling of continuous steel coating by self-induced ion plating

Contino, A.1, Feldheim, V.1, Lybaert, P.1, Deweer, B,2, Cornil, H.2
1 Faculty of Engineering – Thermal Engng. & combustion Lab., Mons – Belgium
2 Arcelor Innovation, Liège, Belgium

The self-induced ion plating (SIIP) process is a new physical vapor deposition process based on the evaporation of a metallic target (i.e. tin) thanks to a magnetron sputtering system.

The aim of this work is to develop a numerical simulation model of the SIIP process in order to predict the target temperature field and from it, the coating profile on the substrate. The simulation of the SIIP process is carried out using the software FEMLAB 3.1. It is divided into two dependent models.

The first one determines, using magnetostatic laws of FEMLAB 3.1, the magnetic field produced by the NbFeB permanent magnets of the magnetron disposed under the crucible. This magnetic field enables us to define the distribution of the heat flow provided to the target by the ionic bombardment. This distribution is an essential data for the second model. In this, the phenomena taken into account are the radiative transfers between surfaces, conduction within various materials and the convection generated by the density variation with temperature (natural convection) and by the electromagnetic force applied on the liquid target because of the magnetic and electric field coexistence in the liquid metallic target. This model gives us the target surface temperature field.

This temperature field is exported in MATLAB and makes it possible to define, thanks to the Knudsen law, the condensed flow and coating profile on the steel substrate.