Author(s)

C. Bartuli, F. Cipri, T. Valente & N. Verdone

Abstract

CPD simulation of an HVOF process for the optimization of WC-CO protective coatings C. Bartuli, F. Cipri, T. Valente & N. Verdone Department of Chemical and Materials Engineering University '%a Sapienza", Rome, Italy Abstract Microstructured and nanostructured WC-Co composite coatings can be deposited by HVOF starting from commercial composite powders. However, the reduction in powder size of the ceramic reinforcement is responsible for a significant increase of WC reactivity, enhancing the decarburation phenomena taking place within the spraying torch, and potentially affecting the mechanical and tribological properties of the deposited coatings. In order to limit the thermal degradation of the reinforcement, it is therefore necessary to strictly control the main combustion parameters of the torch, such as composition, velocity and temperature of the combustion gases. Using a CFD code, thenno-chemical and gas-dynamic properties of the gas flow within an HVOF JP-5000 (Hobart Tafa Inc.) torch w

Keywords