Controlling the solid-state reaction in Fe-MoS2 self-lubricating composites for optimized tribological properties

2022/07/14 by Lima, Gabriel Araujo de, Klein, Aloisio Nelmo, Pagnan Furlan, Kaline
#Ingenieurwissenschaften #Technik #self-lubricating composites #sintering #solid lubricants #tribological properties

paper · doi:10.15480/882.4463

Abstract

In this work, self-lubricating composites containing MoS₂ and graphite dispersed in an iron matrix were produced by powder metallurgy and sintering. Previous studies demonstrate that MoS₂ reacts with iron matrixes during sintering, making the production of Fe-MoS₂ composites rather difficult. Therefore, this study focused on a potential solution to avoid or reduce this reaction, whilst still providing good tribological properties. Our results show that the addition of graphite retards the reaction of MoS₂ with iron and that the combination of MoS₂ + graphite results in composites with an optimized coefficient of friction associated with a low wear rate both in nitrogen and air atmospheres. Through adequate control of the lubricant’s particle size, composition, and processing parameters, self-lubricating iron-based composites with a low dry coefficient of friction (0.07) and low wear rate (5 × 10⁻⁶ mm³·N⁻¹·m⁻¹) were achieved.

Related

• Enhanced mechanical and tribological performance of additively manufactured 316L steel by MoS2-reinforcement
• Novel hybrid nanostructures based on molybdenum disulfide and carbon nanomaterials for lubricating applications
• Ferrous Metal Matrix Composites Status Scope and Challenges
• Effect of crystallinity on the frictional and wear performance of molybdenum disulfide: A molecular dynamics study
• Engineering frictional characteristics of MoS2 structure by tuning thickness and morphology- An atomic, electronic structure, and exciton analysis