Title: NiCrBSi coatings textured by Nd-YAG laser

Authors: Alberto Higuera Garrido, Ruben Gonzalez, Modesto Cadenas, Jose Luis Viesca

Addresses: Department of Mechanical and Civil Engineering, University of Oviedo, Despacho 5.1.21, Edificio Departamental Oeste, Campus de Viesques, Ctra. de Castiello s/n, 33204 Gijon, Asturias, Spain. ' Department of Mechanical and Civil Engineering, University of Oviedo, Despacho 5.1.28, Edificio Departamental Oeste, Campus de Viesques, Ctra. de Castiello s/n, 33204 Gijon, Asturias, Spain. ' Department of Mechanical and Civil Engineering, University of Oviedo, Despacho 5.1.18, Edificio Departamental Oeste, Campus de Viesques, Ctra. de Castiello s/n, 33204 Gijon, Asturias, Spain. ' Department of Mechanical and Civil Engineering, University of Oviedo, Despacho 5.1.27, Edificio Departamental Oeste, Campus de Viesques, Ctra. de Castiello s/n, 33204 Gijon, Asturias, Spain

Abstract: This work presents and discusses the influence of Nd-YAG laser parameters on the texturing of a low laser absorptivity NiCrBSi coating obtained by diode laser cladding. In order to obtain statistical significance, different kinds of design of experiments were considered, choosing a central composite inscribed design as the best according to the number of factors and required runs. In the first stage, a diode laser is used to obtain the NiCrBSi coating and in the second stage an Nd-YAG laser is used to generate surface texturing. Finally, results are observed with a confocal microscope, obtaining diameter and depth of the dimples and statistically studied plotting Pareto charts and response surfaces. The study led to the following conclusions: higher energies and spot diameters generate dimples with larger diameters; low energies and shorter pulse duration involves greater diameters; at high energies diameters remain nearly constant versus pulse duration; at higher energies, shorter pulse durations show greater depths; and at low energies depth remains almost constant versus pulse duration.

Keywords: laser surface texturing; laser cladding; design of experiments; DOE; central composite inscribed; CCI; NiCrBSi coatings; Nd-YAG lasers; surface engineering; nickel chromium boron silicon; pulse duration.

DOI: 10.1504/IJSURFSE.2011.041395

International Journal of Surface Science and Engineering, 2011 Vol.5 No.2/3, pp.75 - 97

Available online: 21 Jul 2011 *

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