Abstract
Ceramic coating is a very important technique used to develop structures that resist wear, corrosion, or oxidation. In this study, the Powder Jet Deposition (PJD) technique is used to form ceramic coatings on structures. The PJD technique is similar to the cold spray technique, but it can be used to coat ceramic layers under room temperature and atmospheric conditions. Therefore, PJD was used for the creation and on-site repair of ceramic coatings on large, complicated structures. The aim of this study is to optimize the spray conditions for an aluminum titanate (TiAl2O5) coating on various substrates using the PJD technique and to evaluate the mechanism of ceramic deposition. In the case of the cold spray technique, a high particle velocity is essential to cause the large-scale plastic deformation of particles that is necessary for deposition. However, while using PJD on ceramic oxides, lower particle velocity proved to be a better deposition condition. The optimized spraying pressure, resulting in the thickest coating, was approximately 0.05 MPa. The particle velocity as measured using a high-speed camera was approximately 90m/s. Therefore with PJD, it is optimal to use a low velocity within a narrow range to form a ceramic coating.
