Tribological behavior of aluminum silicon eutectic alloy based composites under dry and wet sliding for variable load and sliding distance

Abstract

In most of the studies, the tribopair as well as tribo-components interfaces are lubricated using different lubricating oil or solid tribofilms. In the present study, the anti-friction and anti-wear performance of the tribopair is improved using nano-Aluminium Oxide (Al 2 O 3 ) and Graphene Nano Platelets (GNP) as reinforcement for composite and additive for lubricant respectively. Composite material and nano lubricants have attracted the interest of many researchers around the globe to enhance the life, durability and to reduce the friction and wear losses of mechanical components. Hence the objective of this study is to provide an insight to friction and wear reduction behavior of n-Al 2 O 3 and GNP from the tribological aspect. The samples are fabricated using Spark Plasma Sintering (SPS) rapid fabrication route and their tribological properties are determined against chromium-plated-chrome-steel under dry and wet conditions at room temperature using universal reciprocating tribometer. From the results, it is reported that composite samples with (PAO-4 + 0.5 wt% GNP + OA) nano-lubricant exhibit excellent tribological properties. This reduction is friction and wear is attributed to the hard phase ceramic reinforcements and nano-additive in lubricant that provides excellent tribological performance as well as Oleic Acid (OA) which help to improve the dispersion stability of the nano particles in the lubricating oil. Different surface characterization tools i.e. Optical Microscopy, Scanning Electron Microscopy, Electron Dispersion Spectroscopy, 3D surface profilometer are used in this study to understand the wear and lubrication mechanism after tribological testing.

Effect of MWCNTs and heat treatment on coefficient of friction and wear characteristics of MWCNTs reinforced Al6082 composites under dry sliding condition

“…Another reason is the increment in penetration to the softer surface of disk with applied load resulting in the increase in microcracking tendency, which causes deformation and rupturing of asperities as reported in previous literature. 7…”

“…Another reason is the increment in penetration to the softer surface of disk with applied load resulting in the increase in microcracking tendency, which causes deformation and rupturing of asperities as reported in previous literature. 7 Characterization of worn-out surfaces Figure 9 represents SEM images and EDS spectrum of alloy AC and nanocomposites C3 and C4 at 40 N after 3000 m. Since applied load is low, there is no remarkable plastic deformation, confirming the mild abrasive wear. Some local scratches can be noticed on the surface of specimens.…”

“…Tribological characteristics of materials can be improved by reinforcing matrix material. 7 Reinforcement modification not only improves tribological performance but also enhances mechanical properties. Aluminum alloys can be reinforced with materials like TiC, 8 Al 2 O 3 , 9 SiC, 10 AlN, 11 B 4 C, 12 BN, 13 fly ash, 14,15 TiB 2 , 16 and carbonous materials such as graphite, 17 GNP, carbon nanotubes (CNTs), etc.…”

Enhanced extreme pressure and tribological performance of hybrid nano lubricant

“…Following this, the wear scar was examined under an optical microscope and the WV is measured using a 3D profilometer. The specific wear rate (SWR) was also calculated by using WV, load and sliding distance [28].…”

Rare Earth Oxide CeO2 Decorated Graphene Nanoplatelets-Reinforced 2024 Aluminum Alloy Matrix Composites Fabricated by Pressure Sintering Process

“…Since graphene was successfully separated in 2004, it has attracted attention due to its excellent tensile properties, strength, stiffness, and attractive functional properties such as high thermal conductivity and electrical conductivity [1][2][3][4][5][6][7]. Graphene or GNPs is considered to be an effective reinforcing agent for composite materials.…”