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Article

TiN/NbN Nanoscale Multilayer Coatings Deposited by High Power Impulse Magnetron Sputtering to Protect Medical-Grade CoCrMo Alloys

1
National HIPIMS Technology Centre, Materials and Engineering Research Institute, Sheffield Hallam University, Howard Street, Harmer Building, Sheffield S1 1WB, UK
2
Zimmer-Biomet UK Limited, Dorcan Industrial Estate, Swindon SN3 5HY, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Joerg Vetter
Coatings 2021, 11(7), 867; https://doi.org/10.3390/coatings11070867
Received: 28 June 2021 / Revised: 12 July 2021 / Accepted: 16 July 2021 / Published: 20 July 2021
(This article belongs to the Special Issue Hard Coatings for Surface Engineering Solutions)
This study describes the performance of nanoscale multilayer TiN/NbN coatings deposited on CoCrMo medical-grade alloys by utilising novel mixed high power impulse magnetron sputtering (HIPIMS) and direct current unbalanced magnetron sputtering (UBM) technique in an industrial size vacuum coater. Scanning electron microscopy analysis showed that these coatings were extremely dense without any intercolumnar voids. The coating exhibited high hardness of 28 GPa, as well as low friction and wear coefficient of 0.7 and 1.4 × 10−14 m3·N−1·m−1, respectively, as compared to the bare material. Scratch tests revealed superior coating to substrate adhesion due to the HIPIMS etching prior to coating deposition. Energy-dispersive X-ray analysis of the wear debris generated during the impact test together with focused ion beam cross-section analysis in different locations of the impact crater revealed the coating failure mechanism and further confirmed the excellent coating to substrate bonding strength. Potentiodynamic polarisation tests in NaCl and Hank’s solutions revealed the clear passivation behaviour, several orders of magnitude lower corrosion currents, and high pitting potentials of the coating, which guarantee excellent protection to the base alloy in such aggressive environments. Inductively coupled plasma mass spectrometry analysis of Hank’s solution containing corrosion debris of the coated sample revealed that the leaching of harmful metal ions from the base material was reduced to below the detection limit of the technique, thus demonstrating the high barrier properties of the coating. View Full-Text
Keywords: high power impulse magnetron sputtering (HIPIMS); CoCrMo alloy; TiN/NbN multilayer coating; wear resistance; fatigue resistance; fracture toughness; corrosion-resistant high power impulse magnetron sputtering (HIPIMS); CoCrMo alloy; TiN/NbN multilayer coating; wear resistance; fatigue resistance; fracture toughness; corrosion-resistant
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MDPI and ACS Style

Sugumaran, A.A.; Purandare, Y.; Shukla, K.; Khan, I.; Ehiasarian, A.; Hovsepian, P. TiN/NbN Nanoscale Multilayer Coatings Deposited by High Power Impulse Magnetron Sputtering to Protect Medical-Grade CoCrMo Alloys. Coatings 2021, 11, 867. https://doi.org/10.3390/coatings11070867

AMA Style

Sugumaran AA, Purandare Y, Shukla K, Khan I, Ehiasarian A, Hovsepian P. TiN/NbN Nanoscale Multilayer Coatings Deposited by High Power Impulse Magnetron Sputtering to Protect Medical-Grade CoCrMo Alloys. Coatings. 2021; 11(7):867. https://doi.org/10.3390/coatings11070867

Chicago/Turabian Style

Sugumaran, Arunprabhu A., Yashodhan Purandare, Krishnanand Shukla, Imran Khan, Arutiun Ehiasarian, and Papken Hovsepian. 2021. "TiN/NbN Nanoscale Multilayer Coatings Deposited by High Power Impulse Magnetron Sputtering to Protect Medical-Grade CoCrMo Alloys" Coatings 11, no. 7: 867. https://doi.org/10.3390/coatings11070867

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