Effect of Sn particle size on the intermetallic compound formations of cold sprayed Sn-Ni coatings

▶ Effects of small Sn particles on the morphology evolution and intermetallic compound formation of cold sprayed Sn-Ni system on Ni and Cu substrate were investigated. ▶ The different reactivity between Ni-Sn and Cu-Sn could have an influence on the formation of intermetallic compounds. It could be considered that the activation energy barrier of Cu-Sn system was lower that of Ni-Sn combination case. ▶ The reactivities of small particles were turned out to be inferior to corresponding large size of materials. It was suggested that heavier oxide scale of raw material is responsible to this. ▶ It was concluded that the particle size is very important with regard to the formation of intermetallic compounds in annealed cold sprayed coatings.