Kinetic spraying deposition behavior of bulk amorphous NiTiZrSiSn feedstock

Abstract

A kinetic spraying process, which is basically a solid-state deposition process, was used for the formation of a fully amorphous coating. By using a pre-heating system for the powder carrier gas and using helium for the process gas, it was possible to form an amorphous coating. The main process parameters evaluated during this study were gas species [N 2 and He] and pre-heating temperature [RT (below T g) and 550 °C (liquid metallic region)]. Aside from the empirical approach, in-flight particle velocity within the kinetic spraying process was measured using a SprayWatch-2i system. The deposition behavior of a NiTiZrSiSn bulk amorphous powder was observed when it was sprayed using the kinetic spraying process. In order to predict the temperature-dependent deformation behavior of the bulk amorphous material during impact, Vickers microhardness, as an indirect method, was measured at various temperatures. While the bulk amorphous feedstock material was being coated, both the kinetic and thermal energies of the in-flight particles were important. The former affected the deposition of the bulk amorphous coating, while the latter had more effect on the mechanical properties of the coating. Particle deposition behavior was considered from the viewpoint of the environmental effect, such as particle–energy combination, on the deposition behavior. The bonding of the impacting NiTiZrSiSn bulk amorphous particle was primarily caused by temperature-dependent deformation and fracture (local liquid formation) behavior.