Hyperkinetic deposition of nanopowders by supersonic rectangular jet impingement

Abstract In a relatively new coating deposition process, Cold Gas Dynamic Spray (CGDS), a supersonic jet is used to propel the feedstock powder onto a substrate to form coating. Pure Titanium (Ti) powder was sprayed by the CGDS process to establish conditions for the buildup of dense and porous Ti coatings on Ti substrates. In order to better understand the mechanism of CGDS coating of titanium on titanium, we performed a detailed study of the initial stages of coating buildup, where we examined initial attachment of Ti particles to the Ti substrate and the subsequent evolution of their morphology. Use of Ti powder as a one of the components of a composite powder in which the other component is biocompatible nanohydroxyapatite powder (to promote bone growth) for use in coating titanium orthopedic implants is currently under investigation.