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The Effect of Coating Density on Functional Properties of SiNx Coated Implants
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (BioMaterial Systems)
(Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, 58183 Linköping, Sweden)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
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2019 (English)In: Materials — Open Access Journal, ISSN 1996-1944Article in journal, News item (Refereed) Published
Abstract [en]

Ceramic coatings may be applied onto metallic components of joint replacements for improved wear and corrosion resistance as well as enhanced biocompatibility, especially for metal-sensitive patients. Silicon nitride (SiNx) coatings have recently been developed for this purpose. To achieve a high coating density, necessary to secure a long-term performance, is however challenging, especially for sputter deposited SiNx coatings, since these coatings are insulating. This study investigates the time-dependent performance of sputter-deposited SiNx based coatings for joint applications. SiNx coatings with a thickness in the range of 4.3–6.0 µm were deposited by reactive high power impulse magnetron sputtering onto flat discs as well as hip heads made of CoCrMo. SiNx compositional analysis by X-ray photoelectron spectroscopy showed N/Si ratios between 0.8 and 1.0. Immersion of the flat disks in fetal bovine serum solution over time as well as short-term wear tests against ultra-high molecular weight polyethylene (UHMWPE) discs showed that a high coating density is required to inhibit tribocorrosion. Coatings that performed best in terms of chemical stability were deposited using a higher target power and process heating

Place, publisher, year, edition, pages
2019.
Keywords [en]
silicon nitride; coating; reactive high-power impulse magnetron sputtering; wear; joint replacements
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-396226OAI: oai:DiVA.org:uu-396226DiVA, id: diva2:1367032
Projects
This research was funded by the European Union, grant number FP7-NMP-2012-310477 (Life Long Joints project); EBW+ Project Erasmus Mundus Program, Action 2–STRAND 1, Lot 9 (Latin America), Brazil, Grant number 2014-0982.Available from: 2019-10-31 Created: 2019-10-31 Last updated: 2019-10-31

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Filho, LuimarLópez, AlejandroLeifer, KlausEngqvist, HåkanPersson, Cecilia

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