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Towards Functional Silicon Nitride Coatings for Joint Replacements
Uppsala Univ, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. IHI Ionbond AG, Switzerland.
Uppsala Univ, Sweden.
Uppsala Univ, Sweden.
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2019 (English)In: Coatings, ISSN 2079-6412, Vol. 9, no 2, article id 73Article in journal (Refereed) Published
Abstract [en]

Silicon nitride (SiNx) coatings are currently under investigation as bearing surfaces for joint implants, due to their low wear rate and the good biocompatibility of both coatings and their potential wear debris. The aim of this study was to move further towards functional SiNx coatings by evaluating coatings deposited onto CoCrMo surfaces with a CrN interlayer, using different bias voltages and substrate rotations. Reactive direct current magnetron sputtering was used to coat CoCrMo discs with a CrN interlayer, followed by a SiNx top layer, which was deposited by reactive high-power impulse magnetron sputtering. The interlayer was deposited using negative bias voltages ranging between 100 and 900 V, and 1-fold or 3-fold substrate rotation. Scanning electron microscopy showed a dependence of coating morphology on substrate rotation. The N/Si ratio ranged from 1.10 to 1.25, as evaluated by X-ray photoelectron spectroscopy. Vertical scanning interferometry revealed that the coated, unpolished samples had a low average surface roughness between 16 and 33 nm. Rockwell indentations showed improved coating adhesion when a low bias voltage of 100 V was used to deposit the CrN interlayer. Wear tests performed in a reciprocating manner against Si3N4 balls showed specific wear rates lower than, or similar to that of CoCrMo. The study suggests that low negative bias voltages may contribute to a better performance of SiNx coatings in terms of adhesion. The low wear rates found in the current study support further development of silicon nitride-based coatings towards clinical application.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 9, no 2, article id 73
Keywords [en]
silicon nitride; coating; reactive high-power impulse magnetron sputtering; wear; joint replacements
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:liu:diva-155580DOI: 10.3390/coatings9020073ISI: 000460700700011OAI: oai:DiVA.org:liu-155580DiVA, id: diva2:1297918
Note

Funding Agencies|European Union [FP7-NMP-2012-310477]; Erasmus Mundus Programme, Euro-Brazilian Windows + Project [2014-0982]; Swedish Government Strategic Research Area in Materials Science on Advanced Functional Materials [2009-00971]

Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-09-11

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Schmidt, SusannHögberg, Hans
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