Fracture Toughness Of Different PVD Coatings.
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G.M. La Vecchia, S. Baragetti, N. Lecis & P. Marconi
Fracture toughness of different PVD coatings G.M. La Vecchia*, S. Baragetti^, N. Lecis^ & P. Marconi^ ' Universita di Brescia, Dipartimento di Ingegneria Meccanica, Brescia, Italy * Politecnico di Milano, Dipartimento di Meccanica, Milano, Italy * 2effe Engineering, Manerba del Garda, Brescia, Italy Abstract Indentation technique was used to characterize the mechanical properties (elastic modulus, hardness and toughness) both of PVD coatings and autocatalitic chemical deposition ones. TiN and TiCN films were respectively deposited on a duplex stainless steel substrate using PVD technique; moreover a NiP films (P content about 8%) and a NiP/E^C composite ones were used as comparison materials. The effect of different substrate surface finishing (polishing and shot peening) was evaluated. 1 Introduction Nowadays several treatments of the surface and near-surface are available and therefore the designer, in function of the final properties of the component, can select among dif