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Modifications of surface properties of beta Ti by laser gas diffusion nitriding
Ng, Chi-Ho Lawrence, Jonathan Waugh, David G. Chan, Chi-Wai Man, Hau-Chung
Ng, Chi-Ho
Lawrence, Jonathan
Waugh, David G.
Chan, Chi-Wai
Man, Hau-Chung
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2015-10
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Abstract
β -type Ti-alloy is a promising biomedical implant
material as it has a low Young’s modulus but is
also known to have inferior surface hardness.
Various surface treatments can be applied to
enhance the surface hardness. Physical vapour
deposition (PVD) and chemical vapour deposition
(CVD) 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 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 (XRD), optical microscopy (OM), 3-D surface profile & contact angle measurements and nano-indentation test.
Citation
Ng, C-H., Lawrence J., Waugh D.G., Chan C-W., Man H.C. (2015). Modifications of surface properties of beta Ti by laser gas diffusion nitriding. The 34th International Congress on Applications of Lasers and Electro-Optics (ICALEO 2015), 18-22 October 2015, Atlanta, GA., USA.
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Laser Institute of America
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Conference Contribution
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en
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9781940168050