(03-16-2015, 07:31 PM)Steamhammer Wrote: Hello everyone,
I'm looking for some advice about getting better adhesion with my copper spray. I'm flame spraying a 100% copper powder onto an aluminum plate that has been sandblasted with a #16 grit at 125 psi. After spraying, I am soldering copper tubes to the copper layer and, in testing the bond strength, am able to pull off the tube with solder and copper spray layer attached. Is there something I'm missing? Any recommendations? Thanks
Hi Steamhammer,
Flame spraying can not get a good copper coating, especially on aluminum. The fact that the surface of the aluminum and of copper particles are oxidized and metallic bond between the coating and the substrate can not be formed. Furthermore, flame spraying can not give the required speed of copper particles to form a dense coating.
For quality copper coating on aluminum is only suitable methods of cold spray and HVAF.