Optimization of anti-wear and anti-bacterial properties of beta TiNb alloy via controlling duty cycle in open-air laser nitriding

Xianwen Chang, Graham C. Smith, James Quinn, Louise Carson, Chi Wai Chan, Seunghwan Lee*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

A multifunctional beta TiNb surface, featuring wear-resistant and antibacterial properties, was successfully created by means of open-air fibre laser nitriding. Beta TiNb alloy was selected in this study as it has low Young's modulus, is highly biocompatible, and thus can be a promising prosthetic joint material. It is, however, necessary to overcome intrinsically weak mechanical properties and poor wear resistance of beta TiNb in order to cover the range of applications to load-bearing and/or shearing parts. To this end, open-air laser nitriding technique was employed. A control of single processing parameter, namely duty cycle (between 5% and 100%), led to substantially different structural and functional properties of the processed beta TiNb surfaces as analyzed by an array of analytical tools. The TiNb samples nitrided at the DC condition of 60% showed a most enhanced performance in terms of improving surface hardness, anti-friction, anti-wear and anti-bacterial properties in comparison with other conditions. These findings are expected to be highly important and useful when TiNb alloys are considered as materials for hip/knee articular joint implants.

Original languageEnglish
Article number103913
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume110
Early online date09 Jul 2020
DOIs
Publication statusPublished - Oct 2020

Keywords

  • Antibacterial
  • Beta Ti–Nb alloys
  • Duty cycle
  • Fibre laser nitriding
  • Wear

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering
  • Mechanics of Materials

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