コールドスプレーによる金属コーティングの堆積メカニズムに対する基材の粗さの影響

抄録

Cold spray is a relatively new coating technology with high productivity, environmental friendliness and low process temperature, in which the solid particle are accelerated and finally impact on to the surface of the substrate. Through the deformation and the combination of the materials, a coating layer was formed. In this study, optimization of substrate roughness by laser pre-treatment for enhancing the deposition efficiency in cold spray is performed. Materials used here is Cu particle and SUS304 substrate as an impact pair. Finite Element Analysis (FEA) and Smoothed Particle Hydrodynamic (SPH) model was employed to simulate the models in relation with constant powder size (20 μm), for estimating impact interface parameters. Experimentally, particles are deposited on the surface with different surface groove characteristics to compare the simulation results. Microstructures and deposition efficiency were obtained for the coatings. On the basis of the simulation and experiment, optimum substrate roughness for different impact pairs will be suggested for better coating.