Cr2C3-NiCr VPS thermal spray coatings as candidate for chromium replacement

SURFACE & COATINGS TECHNOLOGY

卷:220

Article; Proceedings Paper

Staia, M. H.¹  Suarez, M.¹  Chicot, D.^2,3  Lesage, B.^2,3  Iost, A.⁴  Puchi-Cabrera, E. S.^1,2,3,5 

[1] Cent Univ Venezuela, Fac Engn, Sch Met Engn & Mat Sci, Caracas 1042 A, Venezuela

[2] Univ Lille Nord France, F-59000 Lille, France

[3] USTL, LML, CNRS, UMR 8107, F-59650 Villeneuve Dascq, France

[4] Arts & Metiers ParisTech, Ctr Lille, F-59000 Lille, France

[5] Venezuelan Natl Acad Engn & Habitat, Caracas 1010, Venezuela

关键词: Cr2C3-NiCr coatings;    VPS deposition;    Tribological behavior;    Wear mechanisms;    Wear resistance;   

DOI  :  10.1016/j.surfcoat.2012.07.043

来源: Elsevier

【 摘 要 】

The present investigation has been carried out with the aim of determining the tribological behavior of a VPS chromium carbide coating both in the as-deposited and heat-treated conditions. A commercial powder of Cr2C3-25% NiCr was sprayed employing a VPS system (Medicoat AG, Switzerland) onto plain low carbon steel coupons. The samples were subsequently annealed for 2 h at 600 degrees C, 800 degrees C and 900 degrees C in Ar. The microstructural characterization was carried out by using SEM and XRD before and after the heat treatment of the samples. SEM observations were employed for determining the degradation mechanisms that took place during the wear tests. When the coated systems rubbed against alumina under a 5 N normal load in air, a progressive change in the mechanism, from a mixed adhesive and abrasive, to a predominant abrasive was observed, as the heat treatment temperature increased. The wear constants were found to be of the order of approximately 10(-6) mm(3)/N.m, which indicates a wear resistance of nearly 4 times higher in comparison with the wear results reported in the literature for similar coating systems obtained by employing HVOF deposition. However, the heat treatment carried out at 900 degrees C brought about only 20% increase in the sliding wear resistance of the coated system. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

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