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Development of new β/α″-Ti-Nb-Zr biocompatible coating with low Young's modulus and high toughness for medical applications

Development of new β/α″-Ti-Nb-Zr biocompatible coating with low Young's modulus and high toughness for medical applications
Development of new β/α″-Ti-Nb-Zr biocompatible coating with low Young's modulus and high toughness for medical applications

Ideal biomaterials to fabricate orthopedic implants, especially for load-bearing joint replacements, should include only non-toxic elements with good biocompatibility, high corrosion resistance and surface bioactivity, together with a good combination of mechanical properties. Based on these criteria, a manufacturing approach based on sputtering techniques can be ideal to develop coatings free of toxic elements tailored for advanced applications on pure titanium or titanium alloys used in biomedical applications. In this work, the ternary Ti-Nb-Zr system was used to develop non-toxic β-rich Ti coatings with several complex microstructures by careful control of Nb and Zr concentration and deposition parameters, such as bias voltage. Depending on the alloy chemistry and processing, the coating included variable amounts of α-, α″- and β-phases of Ti with different morphologies and crystallographic texture. Mechanical properties of every coating is largely determined by the micro-structure present, which is directly related to bias voltage used during sputtering process. Thus, hardness values change as a function of the compressive residual stresses magnitude and Young's modulus decreased from 63 GPa, at 0 V, to 47 GPa, at −63 V, being this value close to human bone (~30 GPa). After that, Young's modulus progressively increases to 89 GPa, at −148 V. On the other hand, bioactivity of the coating is practically doubled when compared to Ti6Al4V alloy.

Biomaterials, Low Young's modulus, Martensitic phase transformation, Non-toxic β-rich Ti coatings, Rietveld XRD quantification, Transmission electron microscopy
0264-1275
44-55
Frutos, E.
8730c6ea-7f59-44b7-aa33-cfee57de8b25
Karlík, M.
df29ecf1-6f1e-4713-a15a-82b321804596
Jiménez, J.A.
68c16378-e201-433c-acc7-86995218c32d
Langhansová, H.
8dbb685a-36b8-49d7-9610-9fd437a7b84f
Lieskovská, J.
c1fac01e-82d5-4ef8-a9d8-344fd5ee612e
Polcar, T.
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
Frutos, E.
8730c6ea-7f59-44b7-aa33-cfee57de8b25
Karlík, M.
df29ecf1-6f1e-4713-a15a-82b321804596
Jiménez, J.A.
68c16378-e201-433c-acc7-86995218c32d
Langhansová, H.
8dbb685a-36b8-49d7-9610-9fd437a7b84f
Lieskovská, J.
c1fac01e-82d5-4ef8-a9d8-344fd5ee612e
Polcar, T.
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2

Frutos, E., Karlík, M., Jiménez, J.A., Langhansová, H., Lieskovská, J. and Polcar, T. (2018) Development of new β/α″-Ti-Nb-Zr biocompatible coating with low Young's modulus and high toughness for medical applications Materials & Design, 142, pp. 44-55. (doi:10.1016/j.matdes.2018.01.014).

Record type: Article

Abstract

Ideal biomaterials to fabricate orthopedic implants, especially for load-bearing joint replacements, should include only non-toxic elements with good biocompatibility, high corrosion resistance and surface bioactivity, together with a good combination of mechanical properties. Based on these criteria, a manufacturing approach based on sputtering techniques can be ideal to develop coatings free of toxic elements tailored for advanced applications on pure titanium or titanium alloys used in biomedical applications. In this work, the ternary Ti-Nb-Zr system was used to develop non-toxic β-rich Ti coatings with several complex microstructures by careful control of Nb and Zr concentration and deposition parameters, such as bias voltage. Depending on the alloy chemistry and processing, the coating included variable amounts of α-, α″- and β-phases of Ti with different morphologies and crystallographic texture. Mechanical properties of every coating is largely determined by the micro-structure present, which is directly related to bias voltage used during sputtering process. Thus, hardness values change as a function of the compressive residual stresses magnitude and Young's modulus decreased from 63 GPa, at 0 V, to 47 GPa, at −63 V, being this value close to human bone (~30 GPa). After that, Young's modulus progressively increases to 89 GPa, at −148 V. On the other hand, bioactivity of the coating is practically doubled when compared to Ti6Al4V alloy.

Text Final Version-TP-Emilio-TP-4 - Accepted Manuscript
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More information

Accepted/In Press date: 8 January 2018
e-pub ahead of print date: 10 January 2018
Published date: 15 March 2018
Keywords: Biomaterials, Low Young's modulus, Martensitic phase transformation, Non-toxic β-rich Ti coatings, Rietveld XRD quantification, Transmission electron microscopy

Identifiers

Local EPrints ID: 417463
URI: https://eprints.soton.ac.uk/id/eprint/417463
ISSN: 0264-1275
PURE UUID: fb01339f-2471-441b-9a6e-f636ce4d531d
ORCID for T. Polcar: ORCID iD orcid.org/0000-0002-0863-6287

Catalogue record

Date deposited: 31 Jan 2018 17:30
Last modified: 14 Feb 2018 17:31

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Contributors

Author: E. Frutos
Author: M. Karlík
Author: J.A. Jiménez
Author: H. Langhansová
Author: J. Lieskovská
Author: T. Polcar ORCID iD

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