A Review on Mechanical and Tribological Properties of Graphite Reinforced Self Lubricating Hybrid Metal Matrix Composites

Abstract

Hybrid metal matrix composites (HMMC’s) are next generation metal matrix composite materials that have the potential of gratifying recent demands of advanced energy applications in the field of aerospace, automobile and biomedical. The MMC’s have to work at elevated temperature or vacuum environment where lubrication using liquid lubricants is ineffective or difficult to achieve; moreover, liquid lubricants are not environmental friendly, since they releases pollutants into environment. Solid lubricants such as graphite, CNT’s, MoS2and graphene have been widely used as secondary reinforcements to meet such operational needs by fabricating green or environmental friendly self lubricating HMMC’s. This article outlines recent advances in the area of self lubricating HMMC’s reinforced with graphite as secondary reinforcement. The focus of the study was on mechanical and tribological behavior of Aluminum and magnesium based self lubricating HMMC’s. The effect of graphite, different hybrid reinforcements and their strengthening mechanisms are also discussed in detail.

Material Model Development of Magnesium Alloy and Its Strength Evaluation

“…The hexagonal structure limits easy dislocation motion to the close-packed direction on the basal planes, and plastic deformation of the hexagonal lattice is more complicated than in cubic latticed metals like aluminum, copper and steel. A material model for magnesium alloys should be able to describe these anisotropy, asymmetry and temperature-dependent behaviors [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ].…”

Fabrication and Investigation of Abrasive Wear Behavior of AZ31-WC-Graphite Hybrid Nanocomposites

“…Prakash et al [33] reported that Mg-SiC-Gr hybrid composite possesses three times better microhardness and an approximately 80% less wear rate than the base matrix. Khatkar et al [34] have reviewed the effect of hybridization and reported that graphite possesses noticeable quality as a secondary reinforcement to control mechanical and tribological characteristics. It was also observed that this positive impact of incorporating graphite is obtained up to a transition limit.…”

Permeability and Load Capacity of Iron Porous Bearings with the Addition of Hexagonal Boron Nitride

“…Porous iron-based slide bearings are being produced as pure iron bearings without any additions, with a small graphite addition (0.4–1.0% or 0.5–2% of C), and with considerable copper content (1–5% or even 15–25% Cu) with or without graphite. There are also iron bearings being made with up to 3.5% lead added, depending on the application and needs, as well as iron bearings with added manganese, silicon, tin, nickel, or molybdenum disulfide [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ].…”