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Dissolution behaviour of silicon nitride coatings for joint replacements
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
Institute of Functional Surfaces (iFS), School of Mechanical Engineering, University of Leeds.
Thin Film Physics, Department of Physics, Chemistry and Biology (IFM), Linköping University.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
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2016 (English)In: Materials science & engineering. C, biomimetic materials, sensors and systems, ISSN 0928-4931, E-ISSN 1873-0191, Vol. 62, 497-505 p.Article in journal (Refereed) Published
Abstract [en]

In this study, the dissolution rate of SiNx coatings was investigated as a function of coating composition, in comparison to a cobalt chromium molybdenum alloy (CoCrMo) reference. SiNx coatings with N/Si ratios of 03, 0.8 and 1.1 were investigated. Electrochemical measurements were complemented with solution (inductively coupled plasma techniques) and surface analysis (vertical scanning interferometry and x-ray photoelectron spectroscopy). The dissolution rate of the SiNx coatings was evaluated to 0.2-1.4 nm/day, with a trend of lower dissolution rate with higher N/Si atomic ratio in the coating. The dissolution rates of the coatings were similar to or lower than that of CoCrMo (0.7-1.2 nm/day). The highest nitrogen containing coating showed mainly Si-N bonds in the bulk as well as at the surface and in the dissolution area. The lower nitrogen containing coatings showed Si-N and/or Si-Si bonds in the bulk and an increased formation of Si-O bonds at the surface as well as in the dissolution area. The SiNx coatings reduced the metal ion release from the substrate. The possibility to tune the dissolution rate and the ability to prevent release of metal ions encourage further studies on SiNx coatings for joint replacements

Place, publisher, year, edition, pages
2016. Vol. 62, 497-505 p.
Keyword [en]
silicon nitride, cobalt chromium, coatings, dissolution, corrosion, mass loss, rate
National Category
Materials Engineering Medical Materials
Research subject
Engineering Science with specialization in Materials Science
Identifiers
URN: urn:nbn:se:uu:diva-247794DOI: 10.1016/j.msec.2016.01.049ISI: 000372759100062OAI: oai:DiVA.org:uu-247794DiVA: diva2:797477
Funder
EU, FP7, Seventh Framework Programme, 310477Carl Tryggers foundation , CTS 14:431
Available from: 2015-03-24 Created: 2015-03-24 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Silicon nitride for total hip replacements
Open this publication in new window or tab >>Silicon nitride for total hip replacements
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

For more than 50 years total hip replacements have been a common and successful procedure to increase patient mobility and quality of life. The 10-year implant survival rate is 97.8%. However, for longer implantation times there are limitations linked to the negative biological response to wear and corrosion products from the currently used biomaterials.

In this thesis silicon nitride (SiNx) coatings were evaluated for use in total hip replacements, on the articulating bearing surface and modular taper connections. Homogeneous, dense SiNx coatings were deposited using reactive high power impulse magnetron sputtering (HiPIMS) up to a thickness of 8 µm. The N/Si atomic ratios ranged from 0.3 to 1.1 and the coatings showed a low surface roughness. The wear rate of a SiNx coated cobalt chromium molybdenum alloy (CoCrMo) was similar to that of bulk Si3N4, and less than one 46th of uncoated CoCrMo, an alloy that is commonly used in joint replacements. Wear debris generated from SiNx coatings was round in shape, with a mean size of 40 nm, and ranged between 10 and 500 nm. Model particles, similar in size and shape as the wear debris, were soluble in simulated body fluid. The dissolution rate was higher than the expected rate of debris generation. Along with the size of the debris, which is not in the critical range for macrophage activation, this dissolution may limit negative biological reactions. The SiNx coatings also dissolved in simulated body fluid. The coating with the highest N/Si ratio exhibited the lowest dissolution rate, of 0.2 to 0.4 nm/day, while CoCrMo under the same condition dissolved at a rate of 0.7 to 1.2 nm/day. SiNx-coated CoCrMo exhibited a reduced release of Co, Cr and Mo ions into the solution by two orders of magnitude, compared to uncoated CoCrMo. Si3N4 evaluated under micro-displacement in a corrosive environment, replicating the modular taper, showed a lower corrosion current compared to common biomedical alloys. SiNx coatings may also act beneficially to reduce issues associated with this type of contact.

SiNx coatings have shown several properties in a laboratory environment that are hypothesised to increase the longevity of joint replacements. The promising results encourage further evaluation closer to the clinical application of total hip replacements, in particular in the articulating bearing surface and in modular tapers.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2015. 53 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1242
Keyword
SiNx, Si3N4, coatings, CoCr, Ti, alloy, tribology, wear, corrosion, dissolution, debris, hip, arthroplasty
National Category
Materials Engineering Medical Materials
Research subject
Engineering Science with specialization in Materials Science
Identifiers
urn:nbn:se:uu:diva-247800 (URN)978-91-554-9211-3 (ISBN)
Public defence
2015-05-22, Häggsalen, Ångströmslaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:30 (English)
Opponent
Supervisors
Funder
Swedish Foundation for Strategic Research EU, FP7, Seventh Framework Programme, 310477
Available from: 2015-04-29 Created: 2015-03-24 Last updated: 2015-07-07

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Pettersson, MariaEngqvist, HåkanPersson, Cecilia

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