Abstract
A cold spraying process has been developed for dense and clean and tightly bonded coatings in contract with other established thermal spraying processes. The cold sprayed aluminum is particularly well suited for metallic coatings, such as electric conductor and corrosion resistance. However, the mechanical properties of aluminum coatings formed by the cold spraying have not always been clarified. Two kinds of free-standing aluminum specimens, which were formed by the cold spraying process and an atmospheric plasma spraying process, were machined from the thick coatings and were used for measuring the Young's modulus, Poisson's ratio and bending strength etc. in comparison with a rolled aluminum plate. The experimental results suggested that the crack length and crack density in aluminum coatings had an important effect on the mechanical properties. Namely, high bending strength and high Young's modulus of aluminum coatings could be obtained from the cold spraying process, because of the short crack length and the low crack density.
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