Self-Lubricating Composites Enriched in the Surface with Molybdenum and Nickel

Damin, Keli Vanessa Salvador; Lucena, Alícia Correa; Bendo, Tatiana; Klein, Aloı́sio Nelmo; Binder, Cristiano

doi:10.1590/1980-5373-mr-2018-0803

Cited by 2 publications

(1 citation statement)

References 16 publications

(18 reference statements)

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“…In the past years, nickel (Ni)-based metal matrix composites (Ni–TiC, Ni–Al–SiC, Ni–BN, and Ni–Cr–graphite) were reported to exhibit good tribological properties . Most of these composites are produced through the powder metallurgy route. ,− Nickel–molybdenum (Ni–Mo)-based alloys have been introduced in the automotive sector to avoid scuffing-related problems. Ni–Mo alloys provide self-lubrication under dry conditions and also improve thermal conductivity .…”

Section: Introductionmentioning

confidence: 99%

Tribological Behavior of NiMoAl-Based Self-Lubricating Composites

et al. 2020

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The present study focused on the development of NiMoAl-based self-lubricating composites using solid lubricants as the second phase by powder metallurgy. For this, Cr2AlC MAX phase, Cr2AlC–Ag, and MoS2 powders were mixed with the NiMoAl-based matrix and subsequently hot pressed to produce bulk composite samples. The average hardness and wear resistance of the matrix were found to be increased with the addition of MoS2, Cr2AlC MAX phase, and Cr2AlC–Ag powder to the NiMoAl matrix. The addition of Cr2AlC to NiMoAl was more effective in improving the wear resistance than MoS2. The addition of Cr2AlC and Cr2AlC–Ag has increased the hardness by about 75% than that with the addition of NiMoAl alloy. A scanning Kelvin probe system was used to study the surface properties of the tribofilm in detail through work function mapping from the edge area to the wear area (groove). Among all the samples, the one with the addition of Cr2AlC–Ag powder to the NiMoAl matrix possesses the best tribo-mechanical properties. Cr2AlC–Ag composite addition to NiMoAl was found to decrease the wear rate by one-third and to reduce the coefficient of friction by one-fourth, compared to the base NiMoAl alloy. This was attributed to the high-sintered density and formation of strong tribofilms consisting of mixed oxides such as Ag2MoO4 and Al2O3, as confirmed by micro Raman spectra.

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Section: Introductionmentioning

confidence: 99%

Tribological Behavior of NiMoAl-Based Self-Lubricating Composites

et al. 2020

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Surface Mo or Ni-Enrichment Applied to Granulated Self-Lubricating Composites: Microstructural and Tribological Evaluation

Damin

Tasior²,

Hammes³

et al. 2022

Front. Mech. Eng.

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Sintered self-lubricating components may present inappropriate mechanical properties despite their excellent tribological properties. In general, alloying elements are used to improve these properties, but with a cost increase. As an alternative, surface enrichment (or surface alloying) with alloying elements may be applied. This study developed and characterized sintered composite materials surface-enriched with nickel or molybdenum. The results showed that the surface enrichment process is useful for increasing the tribomechanical properties. The Mo-enriched samples presented superior tribological results. Compared with the reference samples (not enriched), the Mo-enriched specimens showed an increase of 4,954% in scuffing resistance, lower friction coefficient (0.09), and reduced wear rate (68% and 96% lower for the specimen and the counter body). These results were mainly attributed to microstructural modification.

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Self-Lubricating Composites Enriched in the Surface with Molybdenum and Nickel

Cited by 2 publications

References 16 publications

Tribological Behavior of NiMoAl-Based Self-Lubricating Composites

Tribological Behavior of NiMoAl-Based Self-Lubricating Composites

Surface Mo or Ni-Enrichment Applied to Granulated Self-Lubricating Composites: Microstructural and Tribological Evaluation

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