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Production of multifunctional coatings for high performance as solid lubricant and corrosion protection for aerospace components and biomedical devices


Multifunctional nanostructured coatings have a wide range of applications in fields such as the metalworking industry, automotive, electronics, gas, petroleum, aeronautics, and aerospace devices. The devices that will be used in this project are comprised of bearings for centrifuge machines to promote liquid waste purification, and silicone elastomer seals for docking systems, which function as the main interface between mating vehicle structures and prevent breathable cabin air escaping into the vacuum using in spacecraft. Aerospace devices may lose their shape due to corrosion or surface deformation after direct space environmental exposure for an extended period. This project aims to produce and characterize multifunctional nanostructured coatings using plasma and laser texturing technology in two distinct applications: The first motivation for this work comes from an International Space Station (ISS) fluid-processing unit that is essentially a centrifuge urine processor used to purify human liquid waste. Therefore, the liquid waste in contact with the metallic alloys is very corrosive and standard bearing materials do not provide a long life span for centrifuge bearings.The second motivation also from the ISS is related to another topic concerning soft silicone elastomer O-rings S0383-70 in oriented face seal configuration. These O-rings are used to prevent the escape of breathable cabin air into the vacuum and to maintain hermetic sealing capabilities after enduring direct space environmental exposure for extended periods. Outer space is a harsh environment where constituents such as atomic oxygen (AO) and radiation can damage seal materials and compromise their functionality as aerospace connections between spacecraft without adhesion or fouling after connection release. With both materials, it is possible to use adherent carbon films: in the first application, diamond-like carbon (DLC) with low hydrogen content will be applied on NiTi60 alloy to improve the bearing's corrosion protection when in contact with synthetic urine. For the second application, diamond-like carbon (DLC) with silver nanoparticles will be developed on silicone elastomer O-rings. Tribology and Rotating Machinery group, from NASA, Glenn Research Center will provide both substrates. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
OLIVEIRA, S. M. M.; BARZOTTO, I. L. M.; VIEIRA, L.; SENE, A.; RADI, P. A.; FRAGA, S.; BESSA, M. J.; TEIXEIRA, J. P.; CARVALHO, I. C. S.; DA SILVA, N. S.. Tribocorrosion studies on diamond-like carbon film deposited by PECVD on 304 stainless steel in simulated body fluid. BIOMEDICAL PHYSICS & ENGINEERING EXPRESS, v. 5, n. 4, . (13/20054-8, 17/10491-2)
MENEGATTI DE OLIVEIRA, SIMONE MARIA; DA SILVA, NEWTON SOARES; SENE, ANA; GANDRA, RINALDO FERREIRA; BOFF JUNGES, DANIELE SCHAAB; RAMIREZ RAMOS, MARCO ANTONIO; VIEIRA, LUCIA. Comparative Study of Candida albicans Inactivation by Nonthermal Plasma on Stainless Steel with and without Diamond-like Carbon Film. ACS OMEGA, v. 4, n. 4, p. 6891-6902, . (13/20054-8, 17/10491-2)

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