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Ball-on-disc testing of SiNx coatings for hip joint implants
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.
Fraunhofer Institute for Mechanics of Materials IWM, Halle, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
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2011 (English)Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

A standard total hip joint replacement today has the bearing contact metal-on-polymer with cobalt chromium (CoCr) on ultra high molecular weight polyethylene (UHMWPE). The debris from the bearing surfaces lead to inflammation and implant loosening and is a limiting factor. The average lifetime of a CoCr-UHMWPE hip implant is 10-15 years.

 

The aim of the presented project is to develop a silicon nitride coating to be used on CoCr implants, on both head and cup. The potential advantages of silicon nitride include low wear rates, less and smaller wear particles which slowly resorb in vivo, and still with no risk of total failure. Solid silicon nitride is used as a biomaterial for spine implants and as the head for total hip joint replacement.

 

In a first attempt to fabricate silicon nitride coatings, they were deposited by reactive r.f. sputtering using a silicon target and N2 as a reactive gas. The coating parameters were changed by varying the chamber pressure, power, substrate temperature and gas flow. The coatings were deposited on silicon wafers and cobalt chrome substrates.

 

A ball-on-disc setup was used to screen the tribological properties of the coatings, in bovine serum against a ball of polished silicon nitride. The coatings were tested in 1 000 and 10 000 cycles to quantify wear, friction and adhesion. A fairly stable friction was reached with a friction coefficient around 0.15 to 0.30.

 

The coating surfaces were analysed with SEM, EDS, XRD and optical profiler.

 

In conclusion the coatings offer low wear rates and a friction that is relatively stable over the tested deposition parameters. The limiting factor showed to be the adhesion to the substrate rather than the wear of the coating itself.

Place, publisher, year, edition, pages
2011.
National Category
Medical Materials Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-164539OAI: oai:DiVA.org:uu-164539DiVA: diva2:468568
Conference
The International Conference on BioTribology (ICoBT), Imperial Collage, London, September 18-21, 2011.
Available from: 2011-12-21 Created: 2011-12-21 Last updated: 2016-04-20

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Pettersson, MariaOlofsson, JohannaJacobson, StaffanPersson, CeciliaEngqvist, Håkan

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