Laser induced thermal oxidation for colouring of commercially pure Ti (Grade II) is studied. Laser colouring was applied with a ns-pulsed Yb-fiber laser operating at wavelength of 1064 nm and with a pulse duration of 250 ns. The process gas composition was controlled by mixing an inert gas (Ar) with O 2 in different proportions and compared to processing in ambient air. The results were analysed in terms of colour appearance as a function of different laser parameters and surface quality parameters, namely surface roughness and crack size. Chemical composition as well as corrosion behaviour were analysed for a comprehensive characterisation of the oxide layers. It has been observed that compared to working in ambient atmosphere, the use of the inert/reactive gas mixture flow induces a wider range of colours in the same laser parameter range, and generates fewer surface cracks and lower roughness.
|Titolo:||Influence of processing gas composition on laser colouring of commercially pure titanium|
|Data di pubblicazione:||2019|
|Appare nelle tipologie:||01.1 Articolo in Rivista|
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