Laser processed TiN reinforced Ti6Al4V composite coatings

Vamsi Krishna Balla; Abhimanyu Bhat; Susmita Bose; Amit Bandyopadhyay

doi:10.1016/j.jmbbm.2011.09.007

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Laser processed TiN reinforced Ti6Al4V composite coatings

Journal article

Open access

Peer reviewed

Laser processed TiN reinforced Ti6Al4V composite coatings

Vamsi Krishna Balla, Abhimanyu Bhat, Susmita Bose and Amit Bandyopadhyay

Journal of the mechanical behavior of biomedical materials, Vol.6, pp.9-20

02/2012

DOI: https://doi.org/10.1016/j.jmbbm.2011.09.007

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https://hdl.handle.net/2376/105361

PMCID: PMC3272254

PMID: 22301169

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https://doi.org/10.1016/j.jmbbm.2011.09.007View

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Abstract

in vitro wear resistance

Laser deposition

TiN

Metal matrix composites

Biocompatibility

Laser engineered net shaping

Ti6Al4V

The purpose of this first generation investigation is to evaluate fabrication, in vitro cytotoxicity, cell–material interactions and tribological performance of TiN particle reinforced Ti6Al4V composite coatings for potential wear resistant load bearing implant applications. The microstructural analysis of the composites was performed using scanning electron microscope and phase analysis was done with X-ray diffraction. In vitro cell–material interactions, using human fetal osteoblast cell line, have been assessed on these composite coatings and compared with Ti6Al4V alloy control samples. The tribological performance of the coatings were evaluated, in simulated body fluids, up to 1000 m sliding distance under 10 N normal load. The results show that the composite coatings contain distinct TiN particles embedded in α+β phase matrix. The average top surface hardness of Ti6Al4V alloy increased from 394±8HV to 1138±61HV with 40 wt% TiN reinforcement. Among the composite coatings, the coatings reinforced with 40 wt% TiN exhibited the highest wear resistance of 3.74×10−6mm3/Nm, which is lower than the wear rate, 1.04×10−5mm3/Nm, of laser processed CoCrMo alloy tested under identical experimental conditions. In vitro biocompatibility study showed that these composite coatings were non-toxic and provides superior cell–material interactions compared to Ti6Al4V control, as a result of their high surface energy. In summary, excellent in vitro wear resistance and biocompatibility of present laser processed TiN reinforced Ti6Al4V alloy composite coatings clearly show their potential as wear resistant contact surfaces for load bearing implant applications. [Display omitted] ► In vitro biocompatibility and wear performance of Ti6Al4V+TiN coatings were evaluated. ► Ti6Al4V alloy hardness increased from 394 to 1138 HV with 40% TiN reinforcement. ► Coatings with 40% TiN exhibited superior wear resistance compared to CoCrMo alloy. ► Composite coatings exhibited superior cell–material interactions than Ti6Al4V control.

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Title: Laser processed TiN reinforced Ti6Al4V composite coatings
Creators: Vamsi Krishna Balla - W. M. Keck Biomedical Materials Research Laboratory, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA
Abhimanyu Bhat - W. M. Keck Biomedical Materials Research Laboratory, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA
Susmita Bose - W. M. Keck Biomedical Materials Research Laboratory, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA
Amit Bandyopadhyay - W. M. Keck Biomedical Materials Research Laboratory, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA
Publication Details: Journal of the mechanical behavior of biomedical materials, Vol.6, pp.9-20
Academic Unit: Mechanical and Materials Engineering, School of
Publisher: Elsevier Ltd
Identifiers: 99900546860201842
Language: English
Resource Type: Journal article