| Abstract: |
Cold spray technologies have big potentials, for example, reduction of a heat influences on materials, achievement of uniform and dense coating without oxide, compared with thermal spray techniques, because it is solid coating process. In the cold spray process, small particles are accelerated by supersonic gas flow, and then impact onto a substrate. The particles are deposited by the plastic deformation energy converted from kinetic energy of them. Therefore, the spray particles of as-sprayed coating have the high plastic strain induced by cold spray process. By using the high plastic strain as a driving force, the coexistence of high porosity and high cohesion between spray particles might be accomplished in the cold sprayed coating after the post-spray heat treatment.
The purpose of the present study is to develop novel implant material which has a superior biocompatibility and high strength by using the cold spray technique. In this study, the pure titanium coating was sprayed on a titanium alloy, Ti-6Al-4V, by using the cold spray technique. The influences of spray conditions and post-sprayed heat treatments on the mechanical properties of the cold sprayed biomedical coating were investigated. It was revealed from the experimental results that the cold sprayed biomedical titanium coatings had a low elastic modulus, high adhesion and enough tensile strength after the post-sprayed heat treatment. Most important factor to get the superior biomedical coatings was the post-sprayed heat treatment because the adhesion and tensile strength of the coatings could be improved significantly due to the post-sprayed heat treatment.
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