Abstract
Cold spray is a promising technique to produce high quality metallic coatings. However, the details of deposition mechanism have not been understood yet. This study investigates the deposition mechanism of cold-sprayed stainless steel particle to a stainless steel substrate with different feedstock particle size. Spraying of larger particle size of feedstock had advantages for the deposition efficiency and the adhesion strength. It is due to the shock wave formed in front of the substrate surface. The particle velocity of smaller particles were rapidly decreased through the shock wave and lost their performance. Individual particles collected on the substrate (known as splat) clearly revealed the phenomenon. The original particle size was different for each feedstock, but the splat size was almost similar in size. It means that the smaller particles couldn't penetrate the shock wave and only the larger size of particles could deposit.
