Evaluation of HVAF Sprayed Cr3C2 Based Coatings by Abrasion, Erosion and Cavitation Erosion Wear Tests

Monday, May 11, 2015: 11:30 AM
Room 104A (Long Beach Convention and Entertainment Center)
Mr. Ville Matikainen , Tampere University of Technology, Tampere, Finland
Giovanni Bolelli , University of Modena and Reggio Emilia, Modena, Italy
Dr. Heli Koivuluoto , Tampere University of Technology, Tampere, Finland
Luca Lusvarghi , University of Modena and Reggio Emilia, Modena, Italy
Prof. Petri Vuoristo , Tampere University of Technology, Tampere, Finland
Tungsten carbide (WC) and chromium carbide (Cr3C2) coatings sprayed with high kinetic spray processes are commonly applied as wear protective coatings in many industrial fields. The low wear rates of the carbide coatings results from the presence of hard carbide particles embedded in the ductile metal matrix. The wear resistance of the coatings is often evaluated based on their microhardness. However, coatings with similar microhardness values can behave differently under wear. This is due to microstructural differences. Three Cr3C2 based powders (Cr3C2-25NiCr, Cr3C2-50IN625 and Cr3C2-37WC-18matrix) with different chemical compositions were sprayed with High-Velocity Air Fuel (HVAF) spray process. Coating performance was evaluated by abrasion, erosion and cavitation erosion wear tests. Wear surfaces were studied with SEM to identify the effect of coating microstructure and chemical composition on wear behavior. The results showed that coatings with similar hardness values can have significantly different wear behavior.
See more of: HVOF and HVAF
See more of: Fundamentals/R&D