Development of Kinetic Sprayed Coatings for the Application of Die Soldering Resistance

Coating of hard powder materials on hard substrate using kinetic spray technique has been difficult phenomena. In this study, Cermets (MoB/NiCr and MoB/CoCr) and CoMoCr alloy were deposited on a bond coated hard substrate (SKD61) using kinetic spray coating technique. Microstructural, mechanical and thermal characterization of the coatings was carried out using SEM, XRD, pin-on-disc, and DSC etc. The results showed that CoMoCr alloy displayed the highest deposition efficiency along with microstructural and thermal properties, whereas, MoB/NiCr demonstrated the highest mechanical properties. The coatings were tested for soldering resistance by immersion of coated cylinders in molten aluminium alloy bath. MoB/CoCr displayed superior soldering resistance among the coatings.