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Morphology and adhesion of silicon nitride coatings upon soaking in fetal bovine serum
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Materials in Medicine)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Materials in Medicine)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Materials in Medicine)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Materials in Medicine)ORCID iD: 0000-0001-9529-650X
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2018 (English)In: 15th International Symposium on Computer Methods in Biomechanics and Biomedical Engineering and 3rd Conference on Imaging and Visualization, Lisbon, March 26-29, 2018 / [ed] P. R. Fernandes and J. M. Tavares, 2018, article id 116Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

Total hip joint replacements are considered successful in providing patients with close- to-normal lives; however, revision surgeries still represent an individual and socioeconomic burden due to wear and failure of the implants, which occurs at a rate of 3-10% at 10 years. Therefore, eorts are being made to increase the lifespan of articial prostheses. Because of the impossibility to avoid wear debris, functional silicon nitride coatings are being developed due their low wearing, particle solubility and good biological response. However, a compromise needs to be found between coating reactivity and durability.

A HIPIMS process was used to sputter a CrN interlayer followed by a SiNx top layer using 1- and 3-fold rotation in an industrial deposition system (CemeCon AG, Würselen, Germany). In order to measure the adhesion of the coatings to the cobalt-chromium-molybdenum substrates a scratch test was used, consisting of generating a scratch with a Rockwell C diamond stylus, at an increasing load from 0 to 100 N, at a displacement rate of 6mm/min. The samples were immersed in 25% fetal bovine serum solution to mimic synovial joint uid and scratched aer 0, 1, 3, 6 weeks periods in this solution. The cross-section of the coatings was assessed through Focused Ion Beam at 30kV for milling and 5kV for secondary electron imaging of the surface.

The coatings demonstrated a high nitrogen content, previously shown to be benecial in terms of low dissolution rates. The deposition conditions and coating morphology were found to have an eect on the dissolution rate and thereby also the spallation failure of the coatings. These results are informative for the further development of these coatings into parts of functional 3D implants. 

Place, publisher, year, edition, pages
2018. article id 116
Keywords [en]
silicon nitride, adhesion, coating, hip-joint, implant
National Category
Materials Engineering
Research subject
Engineering science with specialization in Applied Mechanics
Identifiers
URN: urn:nbn:se:uu:diva-367351OAI: oai:DiVA.org:uu-367351DiVA, id: diva2:1267057
Conference
CMBBE 2018
Projects
GA-310477 LifeLongJoints
Funder
EU, FP7, Seventh Framework Programme, FP7/2007- 2013Available from: 2018-11-30 Created: 2018-11-30 Last updated: 2018-12-10Bibliographically approved

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Abstract(79 kB)15 downloads
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http://cmbbe2018.tecnico.ulisboa.pt/pen_cmbbe2018/pdf/WEB_ABSTRACTS/Abstracts_CMBBE2018_116.pdf

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