Nanocrystalline WC-Co coatings were deposited by high velocity oxy-fuel from commercial nanostructured composite powders. Processing parameters were optimized for maximal retention of the nanocrystalline size and for minimal decarburation of the ceramic reinforcement. Thermo-chemical and gas-dynamical properties of gas and particles flows within the combustion flame were identified in various operating conditions by CFD simulation. Significant improvements of coatings mechanical properties were evidenced: a decrease of the friction coefficient was measured for the nanostructured coatings, together with an increase of microhardness and fracture toughness.
A Parametric Study of an HVOF Process for the Deposition of Nanostructured WC-Co Coatings / Bartuli, Cecilia; Valente, Teodoro; Bemporad, E; Tului, M.. - STAMPA. - 1:(2003), pp. 283-290. (Intervento presentato al convegno International Thermal Spray Conference tenutosi a Orlando, Florida, USA nel 5-8 May, 2003).
A Parametric Study of an HVOF Process for the Deposition of Nanostructured WC-Co Coatings
BARTULI, Cecilia;VALENTE, Teodoro;
2003
Abstract
Nanocrystalline WC-Co coatings were deposited by high velocity oxy-fuel from commercial nanostructured composite powders. Processing parameters were optimized for maximal retention of the nanocrystalline size and for minimal decarburation of the ceramic reinforcement. Thermo-chemical and gas-dynamical properties of gas and particles flows within the combustion flame were identified in various operating conditions by CFD simulation. Significant improvements of coatings mechanical properties were evidenced: a decrease of the friction coefficient was measured for the nanostructured coatings, together with an increase of microhardness and fracture toughness.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
