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Title: Structural characterization of laser-treated Cr3C2-NiCr coatings
Author: Serra Coromina, Pere
Miguel de la Fuente, José María
Morenza Gil, José Luis
Guilemany, J. M. (José María)
Keywords: Làsers
Revestiments protectors
Corrosió i anticorrosius
Protective coatings
Corrosion and anti-corrosives
Issue Date: 2001
Publisher: Materials Research Society
Abstract: The interconnected porosity of the Cr3C2-NiCr coatings obtained by high-velocity oxy fuel spraying is detrimental in corrosion and wear resistance applications. Laser treatments allow sealing of their surfaces through melting and resolidification of a thin superficial layer. A Nd:YAG laser beam was used to irradiate Cr3C2-NiCr coatings either in the continuous wave mode or at different repetition rates in the pulsed one. Results indicated that high peak and low mean laser irradiances are not good, since samples presented deep grooves and an extensive crack network. At low peak and higher mean laser irradiances the surface was molten, and only a few shallow cracks were observed. The interconnected porosity was completely eliminated in a layer up to 80 m thick, formed by large Cr7C3 grains imbedded in a NiCr matrix.
Note: Reproducció del document publicat a:
It is part of: Journal of Materials Research, 2001, vol. 16, núm. 12, p. 3416-3422
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ISSN: 0884-2914
Appears in Collections:Articles publicats en revistes (Física Aplicada)
Articles publicats en revistes (Ciència dels Materials i Química Física)

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