Cold Sprayed Bell Metal: Improving Adhesion by Substrate Laser Surface Texturing Free

This study investigates improving the adhesion of bell metal repairs using substrate surface treatment. Copper-tin alloy (Cu20Sn) powder was deposited onto Cu20Sn substrates with various surface treatments, including ground, polished, cold spray (CS)-blasted, and laser-textured surfaces. Adhesion was tested using a bending method adapted for thick CS deposits. Results showed that CS-blasting achieved approximately 70 MPa adhesion, while laser texturing yielded up to 120 MPa.The adhesion strength was partially related to the adhesion area ratio, and fractographic analysis revealed the failure mechanisms for each treatment.