Calcium phosphate-titanium composites for articulating surfaces of load-bearing implants

Amit Bandyopadhyay; Stanley Dittrick; Thomas Gualtieri; Jeffrey Wu; Susmita Bose

doi:10.1016/j.jmbbm.2015.11.022

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Calcium phosphate-titanium composites for articulating surfaces of load-bearing implants

Journal article

Open access

Peer reviewed

Calcium phosphate-titanium composites for articulating surfaces of load-bearing implants

Amit Bandyopadhyay, Stanley Dittrick, Thomas Gualtieri, Jeffrey Wu and Susmita Bose

Journal of the mechanical behavior of biomedical materials, Vol.57, pp.280-288

04/2016

DOI: https://doi.org/10.1016/j.jmbbm.2015.11.022

Handle:

https://hdl.handle.net/2376/117528

PMID: 26826471

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Abstract

Prostheses and Implants

Calcium Phosphates - chemistry

Materials Testing

Weight-Bearing

Surface Properties

Titanium - chemistry

Calcium phosphate (CaP)-titanium (Ti) composites were processed using a commercial laser engineered net shaping (LENS™) machine to increase wear resistance of articulating surfaces of load-bearing implants. Such composites could be used to cover the surface of titanium implants and potentially increase the lifetime of a joint replacement. It was hypothesized that adding calcium phosphate to commercially pure titanium (CP-Ti) and Ti6Al4V alloy via laser processing would decrease the material loss when subjected to wear. This added protection would be due to the in situ formation of a CaP tribofilm. Different amounts of CaP were mixed by weight with pure Ti and Ti6Al4V powders. The mixed powders were then made into cylindrical samples using a commercial LENS™-750 system. Microstructures were observed and it was found the CaP had integrated into the titanium metal matrix. Compression test revealed that CaP significantly increased the 0.2% offset yield strength as well as the ultimate compressive strength of CP-Ti. It was found that the addition of CaP to pure titanium reduced the material loss and increased wear resistance. This was due to the formation of CaP tribofilm on the articulating surface. The in situ formed tribofilm also lowered the coefficient of friction and acted as a solid lubricant between the two interacting metal surfaces. Overall, CaP addition to Ti and its alloy Ti6Al4V show an effective way to minimize wear induced damage due to the formation of in situ tribofilm at the articulating surface, a strategy that can be utilized in various biomedical devices.

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Title: Calcium phosphate-titanium composites for articulating surfaces of load-bearing implants
Creators: Amit Bandyopadhyay - W. M. Keck Biomedical Materials Lab, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA. Electronic address: amitband@wsu.edu
Stanley Dittrick - W. M. Keck Biomedical Materials Lab, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA
Thomas Gualtieri - W. M. Keck Biomedical Materials Lab, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA
Jeffrey Wu - W. M. Keck Biomedical Materials Lab, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA
Susmita Bose - W. M. Keck Biomedical Materials Lab, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USA
Publication Details: Journal of the mechanical behavior of biomedical materials, Vol.57, pp.280-288
Academic Unit: Mechanical and Materials Engineering, School of
Publisher: Netherlands
Identifiers: 99900548086701842
Language: English
Resource Type: Journal article