H. AGEORGES, H. AGEORGES, B. PATEYRON, SPCTS - UMR CNRS 6638, Faculty of Sciences, Limoges cedex, France; M. Bouneder, M. El Ganaoui, P. Fauchais, University of Limoges, Limoges, France
When spraying steel particles surrounded by an alumina shell (particles manufactured by mechanofusion) two main types of particles can be collected in flight, those with a central core with pieces of alumina unevenly distributed at its surface and those consisting of a spherical steel particle with an alumina cap.
To better understand phenomena taking place, thermal modeling was applied. Particle trajectories within the jet were calculated according to there injection velocities and then the heat transfer determined, based on enthalpy formulation and finite volume discretization technique to the second order in time and space. A thermal contact resistance TCR takes into account the solid-liquid phase transition. The thermal behavior of each composite particle in the jet and along different trajectories is investigated according to the particle size, the thickness of the alumina shell and the TCR. Numerical results are compared with experimental results obtained with Ar/H2 d.c. plasma jets.
Summary: Keywords: mechanofused particles, plasma spraying, model, thermal contact resistance, particle trajectory, particle temperature
