Deposition mechanism and microstructure of laser-assisted cold-sprayed (LACS) Al-12 wt.%Si coatings

Effects of laser power

E. O. Olakanmi, M. Tlotleng, C. Meacock, S. Pityana, M. Doyoyo

Research output: Contribution to journalArticle

12 Citations (Scopus)

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, 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, 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.

Original languageEnglish
Pages (from-to)776-783
Number of pages8
JournalJOM
Volume65
Issue number6
DOIs
Publication statusPublished - Jun 1 2013

Fingerprint

Coatings
Microstructure
Lasers
Corrosion
Substrates
Laser beam effects
Chemical industry
Shearing
Microhardness
Laser beams
Surface treatment
Cracks
Processing
Costs
Temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)

Cite this

Olakanmi, E. O. ; Tlotleng, M. ; Meacock, C. ; Pityana, S. ; Doyoyo, M. / Deposition mechanism and microstructure of laser-assisted cold-sprayed (LACS) Al-12 wt.%Si coatings : Effects of laser power. In: JOM. 2013 ; Vol. 65, No. 6. pp. 776-783.
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Deposition mechanism and microstructure of laser-assisted cold-sprayed (LACS) Al-12 wt.%Si coatings : Effects of laser power. / Olakanmi, E. O.; Tlotleng, M.; Meacock, C.; Pityana, S.; Doyoyo, M.

In: JOM, Vol. 65, No. 6, 01.06.2013, p. 776-783.

Research output: Contribution to journalArticle

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AU - Pityana, S.

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