WC-Based Coating Production by the Pulsed Gas Dynamic Spraying Process: Coatings and Process Analysis

The work presented in this paper is part of a comprehensive research program aimed at exploring the possible use of pulsed gas dynamic spraying to produce WC-based coatings. This portion of the work assesses the effect of processing parameters on particle characteristics and coating microstructure. Particle velocity is measured at the gun exit using a laser diagnostic system and correlated with various spray parameters. A combination of analysis techniques (OM, SEM, XRD, and microhardness) are used to characterize the feedstock powder and sprayed coatings. The results show that an increase in particle preheating temperature and velocity increases hardness and reduces coating defects.