scholarly journals On the Tribological and Oxidation Study of Xanthophylls as Natural Additives in Castor Oil for Green Lubrication

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5431
Author(s):  
Karla J. Moreno ◽  
María Teresa Hernández-Sierra ◽  
José E. Báez ◽  
Eloy Rodríguez-deLeón ◽  
Luis Daniel Aguilera-Camacho ◽  
...  
Keyword(s):  
Castor Oil ◽  
Sliding Friction ◽  
Wear Properties ◽  
Oxidation Study ◽  
Beneficial Effects ◽  
Lubricating Film ◽  
Wear Protection ◽  
Nmr Techniques ◽  
Green Lubricant ◽  
Biodegradable Lubricant

The present study focuses on an introductory analysis of the use of three xanthophylls as additives for green lubricant applications. For this purpose, the additives were characterized by FTIR and 1H-NMR techniques, and the bio-lubricants were described by their physical properties. The effect of the natural compounds on the friction and wear properties of bio-lubricants were evaluated by sliding friction tests under boundary conditions, as confirmed by an analysis of the lubricating film thickness. The antioxidant capacity was analyzed by FTIR spectroscopy. It was observed better wear protection in castor oil with xanthophylls than without these additives. The wear rate was reduced up to 50% compared with neat oil. Lesser beneficial effects were appreciated in friction coefficient since it was increased 25%. The best contribution was observed with astaxanthin as an additive. In addition, a significant improvement in the oxidation of castor oil, complemented with this additive, was exhibited by FTIR analysis. It was found that xanthophylls could be employed as additives for totally biodegradable lubricant applications since they have better tribological and antioxidant behavior than current additives.

scholarly journals Formulation of Sustainable Water-Based Cutting Fluids with Polyol Esters for Machining Titanium Alloys

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 773
Author(s):  
Elisabet Benedicto ◽  
Eva María Rubio ◽  
Laurent Aubouy ◽  
María Ana Sáenz-Nuño
Keyword(s):  
Molecular Structure ◽  
Tool Wear ◽  
Titanium Alloys ◽  
Film Formation ◽  
Cutting Fluid ◽  
Cutting Fluids ◽  
Lubricating Film ◽  
Wear Protection ◽  
Oil In Water ◽  
Polyol Esters

The machinability of titanium alloys still represents a demanding challenge and the development of new clean technologies to lubricate and cool is greatly needed. As a sustainable alternative to mineral oil, esters have shown excellent performance during machining. Herein, the aim of this work is to investigate the influence of esters’ molecular structure in oil-in-water emulsions and their interaction with the surface to form a lubricating film, thus improving the efficiency of the cutting fluid. The lubricity performance and tool wear protection are studied through film formation analysis and the tapping process on Ti6Al4V. The results show that the lubricity performance is improved by increasing the formation of the organic film on the metal surface, which depends on the ester’s molecular structure and its ability to adsorb on the surface against other surface-active compounds. Among the cutting fluids, noteworthy results are obtained using trimethylolpropane trioleate, which increases the lubricating film formation (containing 62% ester), thus improving the lubricity by up to 12% and reducing the torque increase due to tool wear by 26.8%. This work could be very useful for fields where often use difficult-to-machine materials—such as Ti6Al4V or γ-TiAl – which require large amounts of cutting fluids, since the formulation developed will allow the processes to be more efficient and sustainable.

scholarly journals Tribological properties of MoS2 coating for ultra-long wear-life and low coefficient of friction combined with additive g-C3N4 in air

Friction ◽  
2020 ◽  
Author(s):  
Yupeng Zhang ◽  
Panpan Li ◽  
Li Ji ◽  
Xiaohong Liu ◽  
Hongqi Wan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Solid Lubricant ◽  
Sliding Friction ◽  
Friction Mechanism ◽  
X Ray ◽  
Lubricating Film ◽  
Valence States ◽  
Transmission Electron ◽  
Wear Life

Abstract The solid lubricant MoS2 demonstrates excellent lubricating properties, but it spontaneously oxidizes and absorbs moisture in air, and thus results in poor wear resistance and short wear-life. In this study, the additive g-C3N4 (CN) was successfully combined with MoS2 via hydrothermal synthesis as a solid lubricant for the first time. Meanwhile, a low friction coefficient (COF, μ = 0.031) and ultra-long wear-life of CN/MoS2 compared to pure MoS2 in air were demonstrated. The functional groups and good crystallinity of the lubricant material were characterized via Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD). The formed valence states in CN/MoS2 were analyzed via X-ray photoelectron spectroscopy (XPS). The characterized results of the scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) show the morphology and interior crystal phase structure of CN/MoS2. From the cross-section analysis, the presence of iron oxide nanoparticles lubricating film is synergistic with CN/MoS2 film during the friction process, resulting in its ultra-long wear-life. In particular, the friction mechanism of interlayer sliding friction combined with energy storage friction was analyzed and proposed.

Ultra-Fine and Nano-Crystalline Structure Induced by Sliding Friction of Carbon Steel

2018 ◽  
Vol 382 ◽  
pp. 63-67
Author(s):  
Hirotaka Kato ◽  
Kazufumi Yasunaga
Keyword(s):  
Sliding Friction ◽  
High Hardness ◽  
Carbon Steels ◽  
Wear Properties ◽  
Surface Layers ◽  
Air Atmosphere ◽  
Nano Crystalline ◽  
Vacuum Atmosphere ◽  
Tem Microstructure ◽  
Pin On Disc

Sliding friction is one of the most powerful processes for microstructural evolution in the sub-surface, including grain refinement and recrystallization of deformed structure. Pin-on-disc sliding tests were carried out for 0.45 mass % carbon steels, and TEM microstructure and hardness of the specimens were investigated. Particularly effects of friction conditions on the microstructure at the surfaces and wear properties of the friction induced microstructure were studied. It was found that ultra-fine equi-axed grains in the 30 - 50 nm size range were produced in the case of a high friction speed of 5.0 m/s in an air atmosphere. Moreover, nano-crystalline microstructure can be produced in a vacuum atmosphere even if the friction speed was low. The friction induced nano-crystalline surface layers, which exhibited significant high hardness, showed good wear resistance.

Hydrogen-Induced Wear of Ti–6Al–4V Alloy

2012 ◽  
Vol 476-478 ◽  
pp. 566-569
Author(s):  
Bao Guo Yuan ◽  
Hai Ping Yu ◽  
Ping Li ◽  
Gui Hua Xu ◽  
Chun Feng Li ◽  
...  
Keyword(s):  
Wear Mechanism ◽  
Chemical Element ◽  
Friction And Wear ◽  
Room Temperature ◽  
Sliding Friction ◽  
Wear Properties ◽  
Friction And Wear Properties ◽  
Worn Surface ◽  
Wear Tests ◽  
Friction And Wear Tests

The effects of hydrogen on friction and wear properties of Ti–6Al–4V alloy sliding against GCr15 steel were investigated through dry sliding friction and wear tests in atmosphere at room temperature. Wear mechanism was determined by studying the morphology and chemical element of worn surface using SEM and EDS. Results show that friction coefficient decreases slightly and wear rate increases after hydrogenation. Wear mechanism is discussed.

Synergistic Effects of MoDTC and Overbased Calcium Sulfonate Additive

2013 ◽  
Vol 651 ◽  
pp. 73-76 ◽  
Author(s):  
Zhao Zhou ◽  
Yan Qiu Xia ◽  
Xiang Yu Ge
Keyword(s):  
Sliding Friction ◽  
Synergistic Effects ◽  
Tribological Performance ◽  
Wear Properties ◽  
Sulfonate Additive ◽  
Alkyl Benzene ◽  
Friction Tester ◽  
Calcium Sulfonate ◽  
Alpha Olefin ◽  
Pure Poly

The synergetic effects of molybdenum dialkyldithiocarbamate (MoDTC) and overbased liner alkyl benzene synthetic calcium sulfonate (OBCaS) on the tribological performance of lubricant were investigated using reciprocating ball-on-disk sliding friction tester. The results showed that the two kinds of additives with a certain range of concent ration could improve tribological properties of alone MoDTC. The mass percent of 0.5% MoDTC and 2% OBCaS in pure poly-alpha-olefin (PAO) has the best friction reducing and anti-wear properties.

Preparation and Tribological Properties of Nb1-xTixSe2 Micro/Nanoparticles

2012 ◽  
Vol 619 ◽  
pp. 536-540
Author(s):  
Jia Qing Liang ◽  
Chang Sheng Li ◽  
Hua Tang ◽  
Yi Zhang ◽  
Wen Jing Li ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Sliding Friction ◽  
Layer Structure ◽  
Nano Particles ◽  
Wear Properties ◽  
Repair Work ◽  
X Ray ◽  
Friction And Wear Properties ◽  
Antiwear Ability

Nb1-xTixSe2(x=0～1) micro/nano-particles have been successfully prepared via solid-state thermal (750°C) reaction between microsized Nb, Ti with Se powders under seal environment in a seal quartz tube and characterization by X-ray diffractometer and scanning electron microscopy. It was found that the morphologies of the as-prepared products changed from microplates to micro-nanoparticles or aggregations composed of layer structure with the doping of Ti. And the amount of regular hexagonal microplates evidently reduced and nanoscaled particles increased with the increase of the contents of Ti dopant within a certain limit (1-20 atwt. %). The tribological properties of the as-prepared products as additives in paraffin were investigated by UMT-2 multispecimen tribotester. By the addition of Nb1-xTixSe2micro/nanoparticles in paraffin, the antiwear ability was improved and the friction coefficient was decreased. The paraffin with Nb1-xTixSe2micro/nanoparticles showed better tribological properties than that with pure NbSe2. A combination of the molecule-bearing mechanism of sliding friction, and fill in-repair work between the rubbing surfaces can explain the good friction and wear properties of Nb1-xTixSe2micro/nanoparticles.

Preparation and Wear Properties of (Al3Zr+ZrB2)P/2124 Composites Material with In Situ Process

2012 ◽  
Vol 616-618 ◽  
pp. 1736-1740
Author(s):  
Lei Jiao ◽  
Yu Tao Zhao ◽  
Zhong Zhong Zhang ◽  
Yan Wei Yang ◽  
Ming Rui Zhang
Keyword(s):  
Magnetic Field ◽  
Composite Materials ◽  
Sliding Friction ◽  
Testing Machine ◽  
Test Methods ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Matrix Metal ◽  
The Matrix

With pulse magnetic field, it is use 2124-K2ZrF6-KBF4 as matrix metal to produce chemical reaction to gain (Al3Zr+ZrB2) p/2124 composite materials in this paper. In this paper, For the sake of researching the microstructure, the morphology, the size and the matrix distribution characteristics of the reinforced grain of prepared composite material , those test methods are used, such as optical microscopy, scanning electron microscope, X-ray diffraction analysis and so on. We will research the magnetic field strength how to influence size and distribution of Al3Zr +ZrB2 particle and the abrasion performance of (Al3Zr+ZrB2)P/2124 composite materials in the room temperature. Wear experiment is proceeding in the CETR UMT 3-V the testing machine and sliding friction is friction way with pin-disc but without lubricant, then analyzes the wear mechanism.

Friction and Wear Properties of Al-Based Hypereutectic Silicon Coatings Fabricated by Supersonic Particles Deposition on ZM5 Magnesium Alloy

2014 ◽  
Vol 952 ◽  
pp. 125-129
Author(s):  
Xiao Jun Shi ◽  
Hai Bo Jiang ◽  
Ju Kun Yao ◽  
Zhi Qian Wang ◽  
Chao Ji Zhou ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Testing Machine ◽  
Three Dimensional ◽  
Micro Hardness ◽  
Wear Properties ◽  
Hardness Tester ◽  
Wear Protection ◽  
Resistant Layer ◽  
Mechanical Bonding ◽  
Abrasion Testing

To improve the anti-wear properties of Mg alloys, Al-13Si, Al-15Si and Al-19Si coatings were prepared by supersonic particles deposition on the surface of ZM5 magnesium alloy. Micro-structure and anti-wear properties of the coatings were examined by digital micro-hardness tester, XRD, friction and abrasion testing machine, three-dimensional microscope and SEM. The results show that the wear-resistant layer and the magnesium substrate can be well integrated as mechanical bonding and the main wear failure mechanism of the three coatings is adhesive wear. Moreover, the micro-hardness of Al-19Si coating is 141.47HV0.05, much higher than Al-13Si coating (134.97HV0.05) and Al-15Si coating (136.02HV0.05). Besides, the anti-wear properties of Al-19Si coating is optimal, superior to Al-15Si coating and Al-13Si coating. All of those indicate that Al-19Si coating can provide the most excellent anti-wear protection for ZM5 magnesium alloy.

Sign in / Sign up

Export Citation Format

Share Document