Development of superlattice CrNNbN coatings for joint replacements deposited by High Power Impulse Magnetron Sputtering

EHIASARIAN HOVSEPIAN, Papken, PAPKEN EHIASARIAN, Arutiun, PURANDARE, Yashodhan, ARUNACHALAM SUGUMARAN, Arunprabhu, MARRIOTT, Tim and KHAN, Imran (2016). Development of superlattice CrNNbN coatings for joint replacements deposited by High Power Impulse Magnetron Sputtering. Journal of Materials Science: Materials in Medicine, 27 (9).

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The demand for reliable coating on medical implants is ever growing. In this research, enhanced performance of medical implants was achieved by a CrN/NbN coating utilising nanoscale multilayer/superlattice structure. The advantages of the novel High Power Impulse Magnetron Sputtering technology, namely its unique highly ionised plasma were exploited to deposit dense and strongly adherent coatings on Co-Cr implants. TEM analyses revealed coating superlattice structure with bi-layer thickness of 3.5 nm. CrN/NbN deposited on Co-Cr samples showed exceptionally high adhesion, critical load values of LC2= 50 N in scratch adhesion tests. Nanoindentation tests showed high hardness of 34 GPa and Young's modulus of 447 GPa. Low coefficient of friction (µ) 0.49 and coating wear coefficient (KC) = 4.94 x 10-16 m3N-1m-1 were recorded in dry sliding tests. Metal ion release studies showed a reduction in Co, Cr and Mo release at physiological and elevated temperatures, (70 oC) to almost undetectable levels (<1 ppb). Rotating beam fatigue testing showed a significant increase in fatigue strength from 349±59 MPa (uncoated) to 539±59 MPa (coated). In vitro biological testing has been performed in order to assess the safety of the coating in biological environment, cytotoxicity, genotoxicity and sensitisation testing have been performed, all showing no adverse effects. Keywords: Orthopaedic implant, High Power Impulse Magnetron Sputtering, Superlattice coating, Corrosion, Biocompatibility.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Nanotechnology Centre for PVD Research
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Depositing User: Arunprabhu Arunachalamsugumaran
Date Deposited: 01 Aug 2016 10:29
Last Modified: 18 Mar 2021 07:44

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