Tribological characteristics of mahua oil with graphene nanoplatelets as anti-wear and extreme pressure additive

Abstract

The tribological investigation was performed to seek the role of graphene nanoplatelets (GNPs) in enhancing the physico-tribological properties of mahua oil. The flashpoint, fire point, viscosity, wear preventive characteristics (WPC) and extreme pressure characteristics (EPC) were conducted following the governing standards. A substantial decrement of 17% in the coefficient of friction, 15.15% in wear scar diameter was observed upon blending the 0.25 wt.% GNPs with mahua oil. The WPC morphology on the steel balls portrayed the micro tracks. The EPC investigation presented 1 wt. % GNPs blended mahua oil with the augmented outcome of 7.7% and this was portrayed to be the best GNPs loading in weld load perspective. However, at 0.1 wt.% of GNPs loading was identified as the best loading with a wear point of view. The morphology of EPC revealed severe abrasion and steel balls were exposed to very high temperatures and have undergone metal squeeze out from the contact surface. This article also discusses the different wear regimes and corresponding wear phenomena in four-ball tribology testing with the aid of micrographs. RECEIVED

Investigation of Tribological Properties of Mahua Oil Mixed with Zinc Oxide Nanoparticles

“…Zinc oxide was blended with mahua oil in the concentrations 0.25 wt.% (0.25MO), 0.5 wt.% (0.5MO), 0.75 wt.% (0.75MO), and 1 wt.% (1MO) [11][12][13]. Out of the various methods for dispersion, the authors found that ultrasonication was the most efficient technique [14][15][16], wherein sound energy is applied to agitate the particles. It generates alternating low pressure and highpressure waves which helps in uniform distribution of Nano-additives in the base oil.…”

A study on the effect of various process parameters on low pulsed energy of laser shock peening without ablative layer on the mechanical behavior of AA 7075 T651

“…As part of the Taguchi method, the following steps are performed: selection of an appropriate orthogonal matrix, identification of factors and interactions, transferring those factors and interactions to columns of orthogonal matrices, conducting experiments, analyzing the dataoptimal levels must be determined and all these steps must be verified. A, B, and C represent the three input control factor parameters (Pulse Energy, Number of Spots, and Diameter of Spot, respectively), and their levels in table 4. In equation (4), since the number of levels (L) and numbers of factors (f) are both 3, the degree of freedom (DOF) can be calculated:…”

“…Therefore, they are widely used for automotive, aerospace, construction industries, and marine applications [1][2][3]. Aluminum 7075 alloy is age-hardened among all other aluminum alloys; hence, comparatively, it possesses higher strength [4,5]. AA7075 T651 is of high strength in combination with low density (2810 kg m −3 ).…”

Extreme pressure properties of garlic oil: comparative investigations with PAO4 base oil and PAO/garlic oil blend

“…Furthermore, nano-additives enhance the lubricant's thermo-physical properties. The studies [10][11][12][13][14][15][16][17][18][19][20][21][22] show that nano-particles are effective EP additives.…”