Surface Engineered NiTi Protective Coatings
Maria Ophelia Jarligo1,2 and Andre McDonald2
1Klüger-Tech Inc., Canada
2University of Alberta, Canada
Material chemistries comprising nickel and titanium have been known to exhibit shape memory characteristics and superelasticity. Surface engineering of coatings deposited with such chemistries make them resistant to high temperature corrosion. The cold spray technique, which has been extensively exploited to deposit metallic coatings, was used to fabricate coatings with grain refinement of NiTi particles, which allow for tailoring of microstructure properties. High temperature characterization of solid-state deposited NiTi coatings exposed to corrosive environments at temperatures from 800ºC to 900ºC reveal that the coatings have high resistance to oxidation and carburization based on temperature dependent microstructure and phase stability. The promising results make NiTi chemistries attractive for applications in petrochemical processes. This paper will present the latest experimental findings on the interesting high temperature properties of surface engineered NiTi coatings related to resistance to oxidation and carburization, as well as the results of cold spray deposition trials on industrially relevant base steel.