Effects of Different Plasma Nitrided Layers on the Tribological Performance of DLC Coatings

AUTOR(ES)

Shioga, Pedro Henrique Teshima, Binder, Cristiano, Hammes, Gisele, Klein, Aloisio Nelmo, Mello, Jose Daniel Biasoli de

FONTE

Mat. Res.

DATA DE PUBLICAÇÃO

12/09/2016

RESUMO

When multifunctional surface engineering processes that combine purpose-oriented phases are applied to soft substrates, a combination of high wear resistance, high load support and low coefficients of friction can be achieved. In this study, the effects of different nitrided layers on the tribological behaviour of a diamond-like carbon (DLC) film deposited on a SAE 1040 steel were investigated. The nitriding was carried out under different temperatures and gas mixtures to create three distinct nitrided layers: two compound layers with predominant ε and γ' phases and a diffusion layer. All of the surfaces were then coated with DLC deposited via plasma-enhanced chemical vapour deposition (PECVD). The tribological tests indicated that the best performance was achieved for a specific combination of hardness, surface roughness and nitride type. The best load-bearing capacity between the DLC coating and the soft substrate was achieved when the nitrided layer was primarily a diffusion layer.

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