Tribological Properties of Engine Oil with Carbon Nano-horns as Nano-additives (original) (raw)
Related papers
2016
Dissimilar materials with various nano forms were used as additives for improving properties of lubricants in the recent times. The potential of using functionalized (COOH) Multi-Walled Carbon Nano-tubes (MWCNTs) as additives in mineral oil grade SAE 20W40 was investigated in this study. High specific surface area of MWCNT might cause agglomeration and hence TRITON X-100 as surfactant was added to maintain MWCNT in the de-agglomeration state. However, the addition of Triton X-100 as surfactant in the mineral oil resulted in the variations of its tribological characteristics. The efficiency of MWCNT as anti-wear additive is also dependent on the properties of base oil. The weight percentage of MWCNT considered for preparing the nano-lubricant was taken to be 0.01%, 0.05%, 0.1%, and 0.2% of the lubricant weight. The surfactant Triton X-100 quantity using sonicator is taken to be 350 times the quantity of MWCNT by weight .The surface morphology of the samples was observed using Field E...
This paper presents the enhancement of thermophysical properties (thermal conductivity and viscosity) of engine oil using nano-lubricant additives and a characterization of tribological behaviour in terms of sliding contact interfaces (piston ring assembly) in automotive engines. Al2O3, TiO2 and Al2O3/TiO2 hybrid nanoparticles were suspended in commercially available engine oil (5W-30) in a concentration of 0.25 wt.% for formulating the nano-lubricants. The size of Al2O3 nanoparticles were within the range 8-12 nm while the TiO2 nanoparticles used had a size of 10 nm. The tribological experiments were performed using a tribotester to simulate the sliding reciprocating motion of the piston ring/cylinder liner interface in an engine. The performed tribological tests were all carried out under varying speeds, loads and sliding distance. The experimental results showed that nano-lubricant additives enhanced the thermophysical and tribological properties. The thermal conductivity of lube oil was measured by the 3ω-wire method. Nano-lubricants provide low kinematic viscosity and an increase in the viscosity index by 2%. Whilst, thermal conductivity was enhanced by a margin of 12-16% for a temperature range of 10-130 °C facilitating the dissipation of frictional heat and maintain engine oil properties, as compared with commercial lubricant. The tribological tests showed a minimization of the friction coefficient and wear rate of the ring by 40-50% and 20-30%, respectively. According to the results, nano-lubricants can contribute to improving the efficiency of engines and fuel economy in automotive engines.
Advances in carbon nanomaterials as lubricants modifiers
Journal of Molecular Liquids, 2019
In spite of good development and progress in lubricants, billions US dollars are being lost in many industiries and motor vehicles globally due to engine frictions. Therefore, there is a great need to devlope more efficient and effective lubricats. Many people modified lubricants by using nano materials, which seems to be a bright future. The present review paper considers the application of carbon nanostructures, such as carbon nanotubes and graphene, as nano-additives to lubricants in order to improve their tribological characteristics i.e. to decrease friction and wear. Some important aspects of nanoparticles in modifying lubricants are size, form, structure, surface functionalization, concentration, physical and chemical properties of surfaces, which are outlined in this artcle. It was observed that the adding of nano-additives to lubricants; even at low concentrations; considerably decreased the friction and wear coefficients. Moreover, carbon nanotubes and graphene are environmentally friendly and safe. Thus, all these factors allow positive assessment of the prospects of using the above mentioned nanomaterials to modify lubricants. The present article will be useful for the researchers and industrial persons.
In this paper the tribological behaviour of silicon oxides (20nm) Nanoparticles and Nickel carbon coted (20nm) nanoparticles additives on 10W30 engine lubricating oil for improve the tribological properties of lubricants is presented. These nanoparticle were add to lubricating oil and which are made of different concentrations (0.5, 1, and 2 wt. %). The tribological behaviour was evaluated on a four ball oil testing machine according to ASTM D4172 B and also viscosity measured on Redwood viscometer. Result show that the each set of Nanoparticle significantly reduces the friction coefficient and wear of friction pairs and wear surfaces were analyses by scanning electron microscope (SEM).
Carbon Nanomaterial-Based Lubricants: Review of Recent Developments
Lubricants
This review article summarizes the progress of research on carbon nanomaterial-based lubricants witnessed in recent years. Carbon nanomaterials, such as graphene, carbon nanotubes (CNTs), fullerenes and carbon nanostructures, are at the center of current tribological research on attaining superior lubrication performance. The development of nanomaterial-based solid lubricants, lubricant additives and bulk materials and the related issues in their processing, characterization and applications as well as their tribological performance (coefficient of friction and wear rate) are listed in a structured tabulated form. Firstly, regarding nanomaterial-based solid lubricants, this study reveals that carbon nanomaterials such as graphite, graphene, graphene-based coatings and diamond-like carbon (DLC)-based coatings increase different tribological properties of solid lubricants. Secondly, this study summarizes the influence of graphene, carbon nanotubes, fullerene, carbon nanodiamonds, carb...
A REVIEW ON EFFECT OF ADDITION OF NANO PARTICLES ON TRIBOLOGICAL PROPERTIES OF LUBRICANTS
Wear is the progressive loss of the material from the operating surface of machine due to relative motion between surfaces. The successful design of machine elements depends upon essentially on the understanding tribological principles like wear and friction. The lubricating oils are the blood of the machine’s operation, and the service life and economic effectiveness of the machine are relative to the quality, performance and reasonable use of the oils. Nanoparticles put into lubricating oils can improve the properties of extreme pressure, anti-wear and friction reducing. Efficiency and service life of the machine were also improved. In recent years, many scientific researchers have dedicated themselves to studying lubricating oil additives as an important project. In the present review paper, comparative study of tribological properties like anti-wear and friction reducing properties of nano- lubrication oils are studied. In the studied papers nano- lubrication oils are made by adding different nanoparticles like Cu, CuO, TiO2, CeO2 to different lubricating base oils/engine oils in varying proportions.