Deposition Routes for the Development of Multi-Functional Coatings for Naval Application via Nano-Engineering Methods

摘要

The goal of this metallic coatings effort was to create a reproducible, easily-applied, metallic coating that replaced the hotroll bonded cladding systems currently used on military aircraft. This coating requires a range of functions to improve corrosion performance, coating adhesion, and provide active corrosion protection. The implementation of thermal spray technology provides optimal coating and substrate properties and the use of nano-crystalline or amorphous matrix metallic with desired alloying elements produces a material with superior corrosion performance, high strength, ductility, and wear resistance. Further, the ability to utilize alloy compositions that contain rare-earth elements make it possible to produce a cladding material with active corrosion protection properties at coating defects or mechanical scratches. Appropriate glass forming chemistries were determined and produced in ingot/powder form and deposited as nanocrystalline coatings. Hardness and fatigue testing indicated that the first coatings sprayed were brittle with degraded fatigue life. Because the mechanical properties, especially fatigue properties, are essential for the use of this coating in aircraft applications, the processing was optimized to satisfy the requirements for mechanical and corrosion properties.