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Deposition Mechanism and Microstructure of Laser-Assisted Cold-Sprayed (LACS) Al-12 wt.%Si Coatings: Effects of Laser Power

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Abstract

Surface treatment is one of the most costly processes for treating metallic components against corrosion. Laser-assisted cold spray (LACS) has an opportunity to decrease those costs particularly in transportation systems, chemical industries, and renewable energy systems. This article highlights some of those potential applications. In the LACS process, a laser beam irradiates the substrate and the particles, thereby softening both of them. Consequently, the particles deform upon impact at the substrate and build up a coating. To circumvent the processing problems associated with cold-spray (CS) deposition of low-temperature, corrosion-resistant Al-12 wt.%Si coatings, a preliminary investigation detailing the effect of laser power on its LACS deposition mechanism and microstructural properties is presented. The deposition efficiency, the microstructure, and the microhardness of the LACS-deposited coatings produced by a 4.4-kW Nd:YAG laser system were evaluated. The outcome of this study shows that pore- and crack-free Al-12 wt.%Si coatings were deposited via softening by laser irradiation and adiabatic shearing phenomena at an optimum laser power of 2.5 kW.

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Acknowledgements

The authors thank the CSIR-National Laser Centre, Pretoria, and the University of Johannesburg for financial support, as well as Mr. Lucas Mokwena for helping with the experiments. Dr. E. O. Olakanmi will like to acknowledge the Federal University of Technology, Minna for granting the research fellowship leave to carry out this study.

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Authors and Affiliations

  1. Department of Mechanical Engineering Science, University of Johannesburg, Johannesburg, 2006, South Africa

    E. O. Olakanmi, M. Tlotleng & M. Doyoyo

  2. National Laser Centre, Council for Scientific and Industrial Research, Pretoria, 0001, South Africa

    M. Tlotleng, C. Meacock & S. Pityana

  3. Department of Chemical and Metallurgical Engineering, Tshwane University of Technology, Pretoria, 0001, South Africa

    S. Pityana

  4. Department of Mechanical Engineering, Federal University of Technology, P.M.B. 65, Minna, Nigeria

    E. O. Olakanmi

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  1. E. O. Olakanmi
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  2. M. Tlotleng
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  3. C. Meacock
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  4. S. Pityana
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  5. M. Doyoyo
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Correspondence to E. O. Olakanmi.

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Olakanmi, E.O., Tlotleng, M., Meacock, C. et al. Deposition Mechanism and Microstructure of Laser-Assisted Cold-Sprayed (LACS) Al-12 wt.%Si Coatings: Effects of Laser Power. JOM 65, 776–783 (2013). https://doi.org/10.1007/s11837-013-0611-6

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  • DOI: https://doi.org/10.1007/s11837-013-0611-6

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