Cold Spraying: Window of Deposition and Promising Applications

For optimum spraying conditions and coating performance, a comprehensive understanding of the cold spray process and bonding mechanisms is required. This presentation summarizes the current model for coating formation based on adiabatic shear instabilities. Computer simulations visualize the bonding process and allow for extracting critical parameters that define the “window of deposition”. For selected materials, a correlation between powder characteristics, particle impact conditions and coating properties will be shown. Furthermore, the state of the art in spraying equipment is reviewed. Special emphasis is put on recent improvements that ensure better coating performance and widen the range of sprayable materials. Finally, different application examples are presented to elucidate the potential for a variety of coating and substrate materials.