Characteristics of Al Coatings Fabricated by Detonation Gun Spray on Polymer-based Composites

0.45mm thick Al coatings were deposited by detonation gun spraying (D-gun) on polymer-based composites. The characteristics of the coatings, including micro structure, phase composition and bonding strength, were investigated by means of SEM, EDS, XRD and mechanical testing machine; electrical conductivity and electromagnetic shielding properties were then tested according to GJB 2604-1996 and GJB 6190-2008 respectively. The results indicate that D-gun sprayed Al coating, with bond strength 8.63MPa and porosity about 1.26%, is superior to that of conventional flame spray and plasma spray; D-gun sprayed Al coating, with electrical resistivity 0.181mΩ/□ and 1-40GHz electromagnetic shielding effectiveness above 60dB, is an ideal candidate for electromagnetic shielding utilizing.