Experimental Investigations on Thermophysical, Tribological and Rheological Properties of MoS2 and WS2 Based Nanolubricants with Castor Oil as Base Lubricant

Q3 Engineering

Tribology in Industry Pub Date : 2023-12-15 DOI:10.24874/ti.1472.04.23.07

Jyoti Srivastava, Tandra Nandi, Rakesh Kumar Trivedi

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引用次数: 0

Abstract

Molybdenum disulfide (MoS2) and Tungsten disulfide (WS2) nanoparticles addition to castor oil produce nano lubricants of novel properties. These nanomaterial additives are dispersed thoroughly in the liquid phase and are intended to boost the base fluid's thermo-physical, rheological, and tribological properties. All these properties have been studied by varying concentrations of nanoparticles from 0.05 to 2.5%. The size of both nanoparticles are in the range of <20nm. The density of nano lubricants was found to change with respect to nanoparticle concentration and temperature. The density increases from 0.06 to 0.6% with respect to the increase in concentration and decreases by 4%, for increasing temperature from 25 to 100 o C. A significant (15 %) increase in thermal conductivity with MoS2 nanoparticles in lubricants could be observed while with WS2 nanoparticles only 8 % enhancement was observed. The rheological study suggests that nano lubricants have better dynamic viscosity and shear stress than neat castor oil. A tribology study showed improved lubrication properties of the nanolubricants as compared with base castor oil. The addition of MoS2 and WS2 nanoparticles in castor oil decreased the friction coefficient by 53 % and 42 %, respectively, and reduced the wear scar diameter by 24% and 20 %, respectively, as compared to base castor oil. This study was done to develop nonedible vegetable oil based nanolubricants exploring their potential as emerging lubricants.

查看原文本刊更多论文

以蓖麻油为基础润滑剂的 MoS2 和 WS2 纳米润滑剂的热物理特性、摩擦学特性和流变学特性的实验研究

在蓖麻油中添加二硫化钼（MoS2）和二硫化钨（WS2）纳米粒子可生产出具有新特性的纳米润滑油。这些纳米材料添加剂完全分散在液相中，旨在提高基础油的热物理、流变和摩擦学特性。通过改变 0.05% 至 2.5% 的纳米粒子浓度，对所有这些特性进行了研究。两种纳米粒子的尺寸范围都小于 20 纳米。纳米润滑剂的密度随纳米粒子浓度和温度的变化而变化。随着浓度的增加，密度从 0.06% 增加到 0.6%，而随着温度从 25°C 增加到 100°C，密度则降低了 4%。在润滑剂中添加 MoS2 纳米粒子后，可以观察到热导率显著增加（15%），而添加 WS2 纳米粒子后仅增加了 8%。流变学研究表明，与纯蓖麻油相比，纳米润滑剂具有更好的动态粘度和剪切应力。摩擦学研究表明，与基础蓖麻油相比，纳米润滑剂的润滑性能有所改善。与基础蓖麻油相比，在蓖麻油中添加 MoS2 和 WS2 纳米粒子后，摩擦系数分别降低了 53% 和 42%，磨损疤痕直径分别减少了 24% 和 20%。这项研究旨在开发基于非食用植物油的纳米润滑剂，探索其作为新兴润滑剂的潜力。

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来源期刊

Tribology in Industry Engineering-Mechanical Engineering

CiteScore

2.80

自引率

0.00%

发文量

审稿时长

8 weeks

期刊介绍： he aim of Tribology in Industry journal is to publish quality experimental and theoretical research papers in fields of the science of friction, wear and lubrication and any closely related fields. The scope includes all aspects of materials science, surface science, applied physics and mechanical engineering which relate directly to the subjects of wear and friction. Topical areas include, but are not limited to: Friction, Wear, Lubricants, Surface characterization, Surface engineering, Nanotribology, Contact mechanics, Coatings, Alloys, Composites, Tribological design, Biotribology, Green Tribology.