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Article Dans Une Revue Diamond and Related Materials Année : 2011

Diamond-like carbon film deposited on nitrided 316L stainless steel substrate: A hardness depth-profile modeling

Eli Saúl Puchi-Cabrera
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Jacky Lesage
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M.H. Staia
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Résumé

Adhesion and hardness of Diamond-Like Carbon films are improved by nitriding of the steel substrate prior to PVD deposition. Since the mechanical properties of the nitrided steel layer are not homogeneous, i.e. a significant hardness decrease is observed in the upper nitrided layer close to the surface, an outer surface layer of ~ 15 μm is removed prior to the film deposition. In the present work, a 316L stainless steel substrate is nitrided in a cyanide-cyanate solution at 570 °C during 3 h. The coated system involved the deposition of a hydrogenated, amorphous carbon (a-C:H) solid lubricant of ~ 2 μm including a chromium carbide interlayer. The comparison between the hardness behavior of the DLC/steel and the DLC/nitrided steel systems reveals the existence of a very important hardness gap, which highlights the benefit of the nitriding treatment prior to coating deposition. In addition, the microhardness-depth profile is determined from a load-depth curve, by applying a simple hardness model. The predicted change in hardness is found to be in a very good agreement with the experimental profile, which allows the hardness determination both in the white layer and in the diffusion zone over ~ 30 μm in total depth. However, only the composite hardness modeling allows the accurate determination of the intrinsic hardness of the film.

Dates et versions

hal-00636698 , version 1 (28-10-2011)

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Citer

Didier Chicot, Eli Saúl Puchi-Cabrera, Xavier Decoopman, Francine Roudet, Jacky Lesage, et al.. Diamond-like carbon film deposited on nitrided 316L stainless steel substrate: A hardness depth-profile modeling. Diamond and Related Materials, 2011, 20 (10), pp.1344-1352. ⟨10.1016/j.diamond.2011.10.004⟩. ⟨hal-00636698⟩

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