Print version ISSN 0012-7353
In this paper the coatings Ni=89%, Al = 5,5%, Mo=5,5% and Fe=81,8%, Cr=16%, Ni=2%, C=0,2% were evaluated. The coatings were applied by flame-thermal spray technique. The superficial preparation method was sand blasting. Adhesion, shear, abrasive wear, sliding wear and bending tests were made. The coating Fe-Cr-Ni-C presented minor mass loss, as much for abrasive wear as for the sliding wear. The multilayer presented a greater porosity in the base layer (Ni-Al-Mo) than in the outer layer (Fe-Cr-Ni-C), the last one presented greater amount of nonfused particles and oxides. The failure presented in the adhesion test for the samples with multilayer coating was of adhesive and cohesive characteristic. The stress in which the cracks appear by bending moment in the multilayer coatings diminished with the increase of the thickness.
Keywords : Thermal Spray; Wear; Coating.