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Open AccessArticle

The Effect of Coating Density on Functional Properties of SiNx Coated Implants

1
Division of Applied Materials Science, Department of Engineering Sciences, Uppsala University, 75121 Uppsala, Sweden
2
Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, 58183 Linköping, Sweden
*
Author to whom correspondence should be addressed.
Materials 2019, 12(20), 3370; https://doi.org/10.3390/ma12203370
Received: 12 September 2019 / Revised: 8 October 2019 / Accepted: 12 October 2019 / Published: 15 October 2019
(This article belongs to the Special Issue Bioceramics: Bioinert, Bioactive, and Coatings)
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. View Full-Text
Keywords: silicon nitride; coating; reactive high-power impulse magnetron sputtering; wear; joint replacements silicon nitride; coating; reactive high-power impulse magnetron sputtering; wear; joint replacements
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MDPI and ACS Style

Filho, L.C.; Schmidt, S.; López, A.; Cogrel, M.; Leifer, K.; Engqvist, H.; Högberg, H.; Persson, C. The Effect of Coating Density on Functional Properties of SiNx Coated Implants. Materials 2019, 12, 3370.

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