Experimental Research on Tribological Properties of Mn0.78Zn0.22Fe2O4 Magnetic Fluids

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Wang Li-jun ◽  
Guo Chu-wen ◽  
Ryuichiro Yamane
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Chemical Properties ◽  
Friction Reduction ◽  
Experimental Investigations ◽  
Wear Scar Diameter ◽  
Base Oil ◽  
Turbine Oil ◽  
Physical And Chemical ◽  
And Chemical Properties

The synthesis and application of nanometer-sized particles have received considerable attention in recent years because of their different physical and chemical properties from those of the bulk materials or individual molecules; however, few experimental investigations on the tribological properties of lubricating oils with and without nanoferromagnetic particles have been performed. This work investigates the tribological properties of Mn0.78Zn0.22Fe2O4 nanoferromagnetic as additive in 46# turbine oil using a four-ball friction and wear tester. It is shown that the 46# turbine oil containing Mn0.78Zn0.22Fe2O4 nanoparticles has much better friction reduction and antiwear abilities than the base oil. The 46# turbine oil doped with 6wt%Mn0.78Zn0.22Fe2O4 nanoparticles show the best tribological properties among the tested oil samples, and PB value is increased by 26%, and the decreasing percentage of wear scar diameter is 25.45% compared to base oil.

scholarly journals The research of anti corrosive properties of various compositions on samples of standard metals

2017 ◽  
Vol 19 (4) ◽  
pp. 80-86
Author(s):  
Y.J. Aghazada ◽  
Vaqif M. Abbasov ◽  
Sanan E. Abdullayev ◽  
Elgun K. Hasanov ◽  
Sevinc S. Suleymanova
Keyword(s):  
Inhibition Efficiency ◽  
Chemical Properties ◽  
Steel Plates ◽  
Metalworking Fluids ◽  
Physical And Chemical Properties ◽  
Turbine Oil ◽  
Thermal Analyzer ◽  
Carbon Steel Surface ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract In this proceeding. the compositions of the T-30 turbine oil with liquid rubber. Co. Ni. Zn. Mg and Ba salts of the natural petroleum acids (NPA) boiling in the range 220–340°C and nitro compounds which are produced on the basis of C14H28 α-olefins have been investigated in different ratio and contents as metalworking fluids (MWF). The physical and chemical properties of the produced compositions have been studied. and the morphology of inhibited carbon steel surface was analyzed and characterized by using Fourier transform infrared (FTIR) and scanning electron microscopy (SEM) techniques. The effect of the temperature on the inhibition efficiency and thermodynamic parameters have also been reported. The thermal analyzer was used for the thermogravimetric analysis (TG/DTA) of the prepared MWF. The experiments have been operated with different concentrations of the inhibitor on the steel plates in condensation and environment phases in the experiment chamber.

Relativity in the electronic structure of the heaviest elements and its influence on periodicities in properties

2019 ◽  
Vol 107 (9-11) ◽  
pp. 833-863 ◽  
Author(s):  
Valeria Pershina
Keyword(s):  
Periodic Table ◽  
Chemical Properties ◽  
Relativistic Effects ◽  
Experimental Investigations ◽  
Close Link ◽  
Chemical Studies ◽  
Heaviest Elements ◽  
Chemical Groups ◽  
Physical And Chemical ◽  
And Chemical Properties

AbstractTheoretical chemical studies demonstrated crucial importance of relativistic effects in the physics and chemistry of superheavy elements (SHEs). Performed, with many of them, in a close link to the experimental research, those investigations have shown that relativistic effects determine periodicities in physical and chemical properties of the elements in the chemical groups and rows of the Periodic Table beyond the 6thone. They could, however, also lead to some deviations from the established trends, so that the predictive power of the Periodic Table in this area may be lost. Results of those studies are overviewed here, with comparison to the recent experimental investigations.

scholarly journals Effect of Particle Size and Ligand on the Tribological Properties of Amino Functionalized Hairy Silica Nanoparticles as an Additive to Polyalphaolefin

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Tianyi Sui ◽  
Baoyu Song ◽  
Feng Zhang ◽  
Qingxiang Yang
Keyword(s):  
Silica Nanoparticles ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Homogeneous Solution ◽  
Friction Reduction ◽  
Advanced Materials ◽  
Wear Scar Diameter ◽  
The Past ◽  
The Coefficient Of Friction ◽  
Effect Of Particle Size

Hairy nanoparticles, which graft organic chains on nanoparticles, have led to a wide variety of advanced materials and have been applied in many fields over the past two decades. In this paper, effects of nanoparticle size and organic chain on the tribological properties of amino functionalized hairy silica nanoparticles (HSNs) were investigated. Silica nanoparticles with different sizes and amino group organic chains were synthesized and dispersed into polyalphaolefin (PAO) via a modified process. The synthesized HSNs were characterized by variety of methods. The tribology properties of those HSNs were investigated using a four-ball tribometer. The coefficient of friction and wear scar diameter were measured and analyzed. It was found that the HSNs could form a stable homogeneous solution with PAO. The tribological performance of the PAO 100 was enhanced dramatically by adding the HSNs. The data suggested that HSNs with larger size, longer organic chains, and more amino groups gave better antiwear and friction reduction properties than other nanoparticles.

Investigation of the Tribological Properties of Surfactant-Modified MoS2 Microsized Spheres in Base Oil 500 SN

2007 ◽  
Vol 129 (4) ◽  
pp. 913-919 ◽  
Author(s):  
Xun Fu ◽  
Xiaodong Zhou ◽  
Huaqiang Shi ◽  
Danmei Wu ◽  
Zhengshui Hu
Keyword(s):  
Tribological Properties ◽  
Photoelectron Spectroscopy ◽  
Friction And Wear ◽  
Friction Reduction ◽  
Wear Volume ◽  
Reaction Products ◽  
Tribochemical Reaction ◽  
Adsorption Film ◽  
Base Oil ◽  
Flat Disk

The tribological properties of MoS2 microsized spheres (MS-MoS2) with diameter of 0.5–3μm modified by self-prepared surfactant quaternary ammonium salt of 2-undecyl-1-dithioureido-ethyl-imidazoline (SUDEI) as an additive in base oil 500 SN were investigated and compared with those of commercial colloidal MoS2(CC-MoS2) on a four-ball tester and an Optimol SRV oscillating friction and wear tester in a ball-on-disk contact configuration. The worn surfaces of the bottom flat disk were examined with scanning electron microscopy and X-ray photoelectron spectroscopy. It was found that the MoS2 microsized spheres product was a much better extreme-pressure additive and antiwear and friction-reduction additive in 500 SN than commercial colloidal MoS2(CC-MoS2). Under the appropriate concentration of 0.1% and 0.25% for MS-MoS2 and CC-MoS2 and the load of 400N, the friction coefficient of MS-MoS2/oil and CC-MoS2/oil decreased about 25.0% and 12.5% and the wear volume loss decreased about 50.4% and 12.9% compared with the pure base stock. The boundary lubrication mechanism could be deduced as the effective chemical adsorption film formed by the long chain alkyl (C11H23) and active elements (S and N) in the surfactant SUDEI and tribochemical reaction film composed of the tribochemical reaction products.

Mechanical and Tribological Properties of Ti6Al4V Hardened by Double Glow Plasma Hydrogen-Free Carbonitriding

2005 ◽  
Vol 475-479 ◽  
pp. 3951-3954 ◽  
Author(s):  
Gao Hui Zhang ◽  
Zhi Yong He ◽  
Jun De Pan ◽  
Ping Ze Zhang ◽  
Zhong Xu
Keyword(s):  
Depth Profile ◽  
Friction And Wear ◽  
Chemical Properties ◽  
Wear Test ◽  
Mechanical And Tribological Properties ◽  
C And N ◽  
Glow Plasma ◽  
Physical And Chemical ◽  
Plasma Surface Alloying ◽  
And Chemical Properties

By means of double glow plasma surface alloying process, Ti6Al4V surface was successively carbonitrided forming a layer with special physical and chemical properties. The depth profile of C and N elements showed a tendency of gradual decrease on the Ti6Al4V as well as the depth profile of its hardness. Friction and wear test indicate that the wear resistant property is increased greatly after carbonitriding the Ti6Al4V.

scholarly journals Tribological Properties of SiO2@Cu And SiO2@MoS2 Core-Shell Microspheres As Lubricant Additives

2021 ◽  
Author(s):  
Xiaoliang Ma ◽  
Chaoliang Gan ◽  
Xiaopeng Li ◽  
Yuting Li ◽  
Peng Feng ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Hard Core ◽  
Lubricant Additives ◽  
Friction Reduction ◽  
Wear Volume ◽  
Core Shell ◽  
Base Oil ◽  
Tribological Behaviors ◽  
Lubrication Performance

Abstract Herein, core-shell structural SiO2@Cu and SiO2@MoS2 microspheres were prepared using SiO2 as hard core, Cu and MoS2 as shell. As lubricant additives were introduced into base oil (PAO 40), their friction-reduction and wear-resistance were investigated in detail. Comparing with onefold additive (SiO2, Cu and MoS2), such core-shell structure additives can improve the tribological behaviors at the Hertz contact stress range of 1.26 ~ 2.72 GPa (SiO2@Cu reduces the friction and wear up to 32.47% and 67.86% at 2.72 GPa, respectively). Besides, the tribological properties of SiO2@Cu microspheres are superior to that of SiO2@MoS2 (the wear volume was reduced by 48.45% at 2.72 GPa). The excellent tribological behaviors of SiO2@Cu microspheres can be ascribed to its structural advantage, the synergistic effect of hard SiO2 core and Cu shell. The rolling effect of SiO2, easy-shearing and self-repairing of Cu shell offer a synergistic lubrication function and form a dense protection film, thereby contributing to the optimal lubrication performance.

scholarly journals Experimental Investigations of Physical and Chemical Properties for Microalgae HTL Bio-Crude Using a Large Batch Reactor

Energies ◽  
2017 ◽  
Vol 10 (4) ◽  
pp. 467 ◽  
Author(s):  
Farhad Hossain ◽  
Jana Kosinkova ◽  
Richard Brown ◽  
Zoran Ristovski ◽  
Ben Hankamer ◽  
...  
Keyword(s):  
Batch Reactor ◽  
Chemical Properties ◽  
Experimental Investigations ◽  
Physical And Chemical Properties ◽  
Large Batch ◽  
Physical And Chemical ◽  
And Chemical Properties

scholarly journals Preparation and Tribological Properties of Carbon-Coated WS2 Nanosheets

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2835 ◽  
Author(s):  
Zheng Li ◽  
Fanshan Meng ◽  
Haohao Ding ◽  
Wenjian Wang ◽  
Qiyue Liu
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Hydrothermal Reaction ◽  
Matrix Material ◽  
Lubricant Additive ◽  
Wear Scar ◽  
Protective Film ◽  
Wear Scar Diameter ◽  
Base Oil ◽  
Carbon Coated

WS2-C is produced from a hydrothermal reaction, in which WS2 nano-sheets are coated with carbon, using glucose as the carbon source. In order to investigate the tribological properties of WS2-C as a lubricant additive, WS2-C was modified by surfactant Span80, and friction tests were carried out on an MRS-10A four-ball friction and wear tester. The results show that Span80 can promote the dispersibility of WS2-C effectively in base oil. Adding an appropriate concentration of WS2-C can improve the anti-wear and anti-friction performance of the base oil. The friction coefficient reached its lowest point upon adding 0.1 wt % WS2-C, reduced by 16.7% compared to the base oil. Meanwhile, the wear scar diameter reached its minimum with 0.15 wt % WS2, decreasing by 26.45%. Moreover, at this concentration, the depth and width of the groove and the surface roughness on the wear scar achieved their minimum. It is concluded that WS2-C dispersed in oil could enter friction pairs to avoid their direct contact, thereby effectively reducing friction and wear. At the same time, WS2-C reacts with the friction matrix material to form a protective film, composed of C, Fe2O3, FeSO4, WO3, and WS2, repairing the worn surface.

scholarly journals Agate Genesis: A Continuing Enigma

Minerals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 953 ◽  
Author(s):  
Terry Moxon ◽  
Galina Palyanova
Keyword(s):  
Amorphous State ◽  
Chemical Properties ◽  
Experimental Investigations ◽  
Scientific Instrumentation ◽  
Silica Source ◽  
Multi Stage ◽  
Stage Process ◽  
Host Rocks ◽  
Physical And Chemical ◽  
And Chemical Properties

This review covers the last 250 years of major scientific contributions on the genesis of agates found in basic igneous host rocks. From 1770 to 1955, the genesis question was frequently limited to discussions based on observations on host rock and agate thick sections. Over the next 25 years, experimental investigations examined phase transformations when silica glass and various forms of amorphous silica were heated to high temperatures. This work demonstrated that the change from the amorphous state into chalcedony was likely to be a multi-stage process. The last 40 years has seen modern scientific instrumentation play a key role in identifying the physical and chemical properties of agate. The outcome of this work has allowed limited evidence-based comment on the conditions of agate formation. There is a general consensus that agates in these basic igneous hosts form at <100 °C. However, the silica source and the nature of the initial deposit remain to be proven.

Effect of Lubrication Additives on the Physical and Chemical Properties of Soyabean Oil

2009 ◽  
Vol 62-64 ◽  
pp. 374-379
Author(s):  
E.O. Aluyor ◽  
T.O.K. Audu
Keyword(s):  
Soybean Oil ◽  
Pour Point ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Base Oil ◽  
Point Reduction ◽  
Point Depressant ◽  
Anti Oxidant ◽  
Physical And Chemical ◽  
And Chemical Properties

The effect of two lubrication additives on the physical and chemical properties of refined soybean oil was studied. The two additives used were a complex blend of anti-oxidant; anti-wear and pour-point depressant-AP821 and AP820- used in the production of Super v and Visco 2000 brands of lubricants respectively. The physical and chemical properties of the soybean oil and base oil samples containing varying percent by volume of each additive were analysed. Results obtained show that the flashpoint of soybean oil increased from 256.6oC to 265oC and 284oC for the AP821 and AP820 additives respectively. This was better than the increase recorded for the base oil which increased from 208oC to 215 oC and 228oC for the AP821 and AP820 additives respectively. Other results obtained for pour point reduction, specific gravity and viscosity showed a positive effect of the additives on soybean oil.

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