- Title
- The role of deposition temperature and scanning speed in the functional performance of laser assisted cold sprayed (LACS) coatings
- Creator
- Olakanmi, E.O., Oladijo, O.P., Obadele, B.A.
- Subject
- Laser assisted cold sprayed (LACS), Solid state consolidation, Corrosion resistance
- Date
- 2016
- Type
- Conference proceedings
- Identifier
- http://hdl.handle.net/10210/215351
- Identifier
- uj:21407
- Identifier
- Citation: Olakanmi, E.O., Oladijo, O.P & Obadele, B.A. 2016. The role of deposition temperature and scanning speed in the functional performance of laser assisted cold sprayed (LACS) coatings.
- Description
- Abstract: The functional performance of laser assisted cold sprayed (LACS) commercially pure ( CP) grade 1 titanium coatings was elucidated in terms of its mechanism of densification, microstructural evolution and corrosion resistance as the deposition temperature and scanning speed were altered by employing optical microscopy (OM) and potentio-dynamic polarization technique. The outcome of this study indicates that the densification mechanism of the coating was mainly influenced by the ratio of the processing temperature (T) and the scanning speed (SS) which is designated as . The attainment of the optimised functional properties of the coatings could be attributed to the thermal shear in the titanium film as well as its solid state inter-particulate consolidation resulting from localised thermal gradient which was induced between the ductile titanium particles and the brittle oxide film covering it at the optimum laser-gas-material interaction obtained at 600oC/10mm/s coupled with the adiabatic shearing of the particles upon impact at the deposition site. It was also established that microstructural porosity and cracks resulted from the increased lifetime of the liquid phase under suboptimal processing conditions which allowed more time for the propellant gas to initiate bubble formation within the coating’s microstructure. In addition, non-optimal parameters failed to attain the most desirable microstructural properties and corrosion resistance for the coatings. Finally, key factors in optimising LACS process parameters in order to achieve fully dense coatings are outlined.
- Language
- English
- Rights
- ©2016, authors
- Full Text
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