Structure and wear properties of laser gas nitrided NiTi surface

The laser gas nitriding process is an efficient technique for modification of materials. Composite coatings with a microstructure consisting of dendritic TiN/NiTi were fabricated on a substrate of NiTi by the laser gas nitriding process. Different nitrogen flow rates were supplied during the laser p...

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Bibliographic Details
Published in:Surface & coatings technology 2006-04, Vol.200 (16), p.4879-4884
Main Authors: Zhao, N.Q., Man, H.C., Cui, Z.D., Yang, X.J.
Format: Article
Language:English
Subjects:
Applied sciences
Contact of materials. Friction. Wear
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Heat treatment
Laser gas nitriding
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
NiTi shape memory alloy
Nonmetallic coatings
Other topics in materials science
Physics
Production techniques
Surface treatment
Thermochemical treatment and diffusion treatment
TiN coating
Wear resistance
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Summary:The laser gas nitriding process is an efficient technique for modification of materials. Composite coatings with a microstructure consisting of dendritic TiN/NiTi were fabricated on a substrate of NiTi by the laser gas nitriding process. Different nitrogen flow rates were supplied during the laser process in order to detect the influence of the TiN on the wear resistance. The wear resistance of the TiN/NiTi coatings was evaluated under sliding wear test conditions in 5% NaCl aqueous solution at room temperature. The results indicate that the TiN/NiTi coatings have excellent abrasive and adhesive wear resistance because of the high hardness and the proportion of the TiN.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2005.04.043