Modifications of surface properties of beta Ti by laser gas diffusion nitriding

Chi Ho Ng, Chi Wai Chan, Hau Chung Man, David Waugh, Jonathan Lawrence

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

β-type Ti-alloy is a promising biomedical implant material as it has a low Young's modulus and is also known to have inferior surface hardness. Various surface treatments can be applied to enhance the surface hardness. Physical vapor deposition and chemical vapor deposition are two examples of this but these techniques have limitations such as poor interfacial adhesion and high distortion. Laser surface treatment is a relatively new surface modification method to enhance the surface hardness but its application is still not accepted by the industry. The major problem of this process involves surface melting which results in higher surface roughness after the laser surface treatment. This paper will report the results achieved by a 100 W continuous wave (CW) fiber laser for laser surface treatment without the surface being melted. Laser processing parameters were carefully selected so that the surface could be treated without surface melting and thus the surface finish of the component could be maintained. The surface and microstructural characteristics of the treated samples were examined using x-ray diffractometry, optical microscopy, three-dimensional surface profile and contact angle measurements, and nanoindentation test.

Original languageEnglish
Article number022505
JournalJournal of Laser Applications
Volume28
Issue number2
Early online date31 Mar 2016
DOIs
Publication statusPublished - 1 May 2016
Externally publishedYes

Keywords

  • Beta titanium
  • Laser surface treatment
  • Surface hardening

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • Instrumentation

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