High temperature oxidation behaviour of laser surface alloyed iron-silicon coatings on iron

S.K. Roy; A. Fasasi; M. Pons; A. Galerie; M. Caillet

doi:doi:10.1051/jp4:1993966

Proceedings of the 3rd International Symposium on High Temperature Corrosion and Protection of Materials
Actes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température

J. Phys. IV France 03 (1993) C9-625-C9-633
DOI: 10.1051/jp4:1993966

High temperature oxidation behaviour of laser surface alloyed iron-silicon coatings on iron

S.K. Roy¹, A. Fasasi², M. Pons², A. Galerie² and M. Caillet²

¹ Laboratoire Science des Surfaces et Matériaux Carbonés, URA CNRS n° 413, ENS d'Electrochimie et d'Electrométallurgie de Grenoble, Institut National Polytechnique de Grenoble, B.P. 75, Domaine Universitaire, 38402 Saint-Martin d'Hères, France
² Laboratoire Science des Surfaces et Matériaux Carbonés, URA CNRS n° 413, ENS d'Electrochimie et d'Electrométallurgie de Grenoble, Institut National Polytechnique de Grenoble, B.P. 75, Domaine Universitaire, 38402 Saint-Martin d'Hères, France

Abstract
Iron silicide (Fe₃Si) coatings of composition Fe-16 at% Si and Fe-25 at% Si have been produced by laser surface alloying on pure iron substrates with predeposited silicon powder. The coatings showed excellent adherence without any pores or cracks. They were compositionally and microstructuraly homogeneous, exhibiting two to three times higher surface hardness values than pure iron. High temperature oxidation resistance of the coatings were tested in the temperature range 1173-1273 K in static pure oxygen (P_O₂ = 13.3 kPa.) Their superiority compared to bulk alloys and CVD coatings is discussed.