Abstract
Thermal spray technology has ben used in various fields of industries such as aero, gas turbine, semi-conductor and automobile industries. The technology can form thick deposits in a short time by impinging molten particles onto the substrate. When metal deposits are sprayed in thermal spray method, coatings are oxidized because the powders are elevated to more than their melting temperature and react with oxygen in the air. A new spray method called cold spray has appeared as a way to prevent metals from oxidizing during coating. In this paper, it was studied how the hardness and the deposition efficiency of the stainless steel 316L deposits were affected by spray conditions. The microstructure of those deposits was also investigated by observing the cross section images with a microscope. Two types of powders, gas and water atomized, were sprayed on stainless steel 304 substrate in cold spray processes. They were found remarkably different in hardness and deposit efficiency.
