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Potential of electrical discharge treatment to enhance the in vitro cytocompatibility and tribological performance of Co–Cr implant

Published online by Cambridge University Press:  06 August 2019

Amit Mahajan  and
Sarabjeet Singh Sidhu Open the ORCID record for Sarabjeet Singh Sidhu [Opens in a new window]
Amit Mahajan*
Affiliation:
Ph.D. Research Scholar, IKG Punjab Technical University, Kapurthala, Punjab 144603, India; and Department of Mechanical Engineering, Khalsa College of Engineering & Technology, Amritsar, Punjab 143001, India
Sarabjeet Singh Sidhu
Affiliation:
Department of Mechanical Engineering, Beant College of Engineering & Technology, Gurdaspur, Punjab 143521, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In the current research, the application and capability of electric discharge treatment (EDT) for enhancing the cytocompatibility and tribological properties of medical-grade Co–Cr alloy were investigated. The Co–Cr specimens were treated by copper tungsten (Cu–W) electrode in a deionized water tank (dielectric medium) at different spark energy levels. To examine the cytocompatibility of substrates, the MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assay was performed to evaluate the substrate cell viability. Furthermore, the wear rate and coefficient of friction of the substrates were examined on a pin-on-disc tribometer. In vitro cytocompatibility results revealed that the % viability of the MG-63 cells on EDT sample was approximately two times improved compared with that on the untreated surface. The tribological results showed that the treated samples have better friction reducing properties and four times higher wear resistance compared with unmachined Co–Cr samples. The surface modification at 10 A current and 60 µs pulse on-time and 150 µs off-time were found as significant parameters in both assessments.

Keywords

Co–Cr alloyelectrical discharge treatmentcytocompatibilitytribologicalwear resistancecoefficient of friction
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 16 , 28 August 2019 , pp. 2837 - 2847
Copyright
Copyright © Materials Research Society 2019 

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