Study of the adsorption of anti-wear additives on the surface of butosyl in oil dispersions

2021 ◽  
pp. 18-23
Author(s):  
E.V. Golovanova ◽  
◽  
I.R. Tatur ◽  
S.I. Tverdokhleb ◽  
D.I. Moskalenko ◽  
...  
Keyword(s):  
Surface Tension ◽  
Silica Gel ◽  
Dispersion Medium ◽  
Calculated Data ◽  
Industrial Oil ◽  
Reference Medium ◽  
The Media ◽  
Plastic Lubricants ◽  
Tension Curves ◽  
Tribological Parameters

The method for evaluating the adsorption capacity of surfactants for plastic lubricants on inorganic thickener, such as silica gel, bentonite, carbon black, colloidal graphite, and others was proposed. The Gibbs adsorption values were calculated based on surface tension curves of samples in oil media, and the adsorption isotherms for each of the media were plotted based on the calculated data. According to the results of the study of the surface tension and refractive index of DF-11 additive solutions in heptane, it was found that 1% of the mass goes to fill the butosil surface, and the rest of its amount remains in the volume. But for the A-22 additive in the reference medium, the filling of the butosil surface occurs at a concentration of 2 % mass. It is shown that the additive A-22 should be used at higher concentrations than DF-11 to improve tribological parameters of silica gel lubricants. It was found that use of butasil based silica-gel grease the mixture of the industrial oil I-40A and PMS-400 as a dispersion medium, allows to reduce concentration of DF-11 and A-22 additives.

The effect of the polarity of the dispersion medium on the structure and properties of plastic lubricants

1972 ◽  
Vol 8 (6) ◽  
pp. 432-436
Author(s):  
I. G. Fuks ◽  
Yu. N. Shekhter ◽  
T. V. Fedorova ◽  
B. N. Kartinin
Keyword(s):  
Dispersion Medium ◽  
Structure And Properties ◽  
Plastic Lubricants

Improvement of the tribological parameters of lubricants by the introduction of an inorganic polymer additives

2021 ◽  
pp. 64-67
Author(s):  
I. V. Kolesnikov ◽  
Keyword(s):  
Wear Resistance ◽  
Dispersion Medium ◽  
Zinc Phosphate ◽  
Operating Parameters ◽  
Structure Transformation ◽  
Antifriction Additive ◽  
Lubricating Film ◽  
Tribotechnical Properties ◽  
Tribotechnical Characteristics ◽  
Tribological Parameters

The use of zinc phosphate tungstate additive to improve the tribotechnical characteristics of "ЦИАТИМ-201" and "ЛЗ-ЦНИИ" greases is considered. It is established that the introduction of the 2Zn(PO3)2•4WO3 additive into the dispersion medium of these lubricants improves the tribotechnical properties, reducing the operating parameters. Keywords: friction, semisolid lubricant, wear resistance, antifriction additive, zinc phosphorus tungstate, structure transformation, lubricating film. [email protected]

STUDY OF THE RESISTANCE OF TAPERS WHEN APPLYING METAL-CLADDING LUBRICANT-COOLING FLUIDS

2021 ◽  
pp. 57-61
Author(s):  
IVAN Yu. IGNATKIN ◽  
Keyword(s):  
Wear Resistance ◽  
High Speed ◽  
Cutting Speed ◽  
Calculated Data ◽  
High Speed Steel ◽  
Additive Concentration ◽  
Relative Wear ◽  
Relative Wear Resistance ◽  
Industrial Oil ◽  
Rotary Speed

The paper discusses the results of comparative tests of the period of tap resistance in various technological environments. The workpieces were processed in the medium of industrial oil I-30 with using a 10 and 20 percent solution of the metal-coating additive “Valena SV” in the same oil. The tests were performed on M10×1 taps made of high-speed steel of the R6M5 brand during the production of through threaded holes in samples made of steel of the Steel 40X brand. The cutting speed varied from 5.7 to 11.1 m/min at the rotary speed of the tool ranging between 180 and 355 rpm. Based on the experimental material, a regression model of the relationship between the relative wear resistance and the additive concentration, and cutting speed has been determined. The author has evaluated the model adequacy and the convergence of the experimental and calculated data. It has been found that at a cutting speed of 11.1 m/min and an additive concentration of 20%, the relative wear resistance of the taps increased by 3.1 times. The results obtained testify to the eff ectiveness of the composition and confi rm the hypothesis of an increase in the wear resistance of the taps in the medium of metal-plating lubricating-and-cooling liquids.

scholarly journals Surface tension of O2-Ar, N2-Ar and O2-N2-Ar mixtures

2019 ◽  
pp. 21-27
Author(s):  
Mauricio García-Martínez ◽  
Benjamín Ibarra-Tandi ◽  
Daniel Porfirio Luis-Jiménez ◽  
Jorge López-Lemus
Keyword(s):  
Experimental Data ◽  
Surface Tension ◽  
Force Fields ◽  
Ternary Mixtures ◽  
Binary And Ternary Mixtures ◽  
Experimental Surface ◽  
Argon Mixture ◽  
Dynamics Simulations ◽  
Tension Curves ◽  
Good Agreement

The surface tension of some binary and ternary mixtures was calculated by means of molecular dynamics simulations in a canonical set. The analyzed mixtures were oxygen-argon, nitrogen-argon and oxygen-nitrogen-argon. The force field for argon was recalculated in order to reproduce the experimental surface tension. The corresponding force fields for O2 and N2 were taken from a previous work [Mol. Simul. 45 (2019) 958-966], where it was shown that such force fields reproduce the experimental surface tension curves, as pure fluids. The nitrogen-argon surface tension was calculated for several mole fractions of argon. The obtained curve was compared with those experimental data and a good agreement was found. The standard Lorentz-Berthelot combining rules were employed. For the oxygen-argon mixture it was necessary to modify the cross term of the combining rules in order to reproduce theoretical and experimental data. The surface tension of the ternary mixture was also estimated varying the mole fraction of argon at a certain concentration of oxygen and nitrogen, previously adjusted. Several temperatures were used in order to show a tendency mostly at relatively low temperatures. After comparing the available experimental data, which are scarce, a good agreement was observed.

Some Problems of Boundary Conditions in the Cavitation

2002 ◽  
Author(s):  
Alexey G. Terentiev
Keyword(s):  
Surface Tension ◽  
Free Boundary ◽  
Boundary Conditions ◽  
Gravity Field ◽  
Constant Pressure ◽  
Calculated Data ◽  
Cavitating Flow ◽  
Capillary Surface ◽  
Flow Problems ◽  
Cavity Boundary

Most of cavitation problems are considered by standard conditions i.e. Neumann’s condition on the boundary, constant pressure on the cavity boundary and undisturbed flow in infinty. In this paper cavitating flow problems are considered by following conditions: a) evaporation from free boundary into the cavity, b) capillary surface tension on the boundary of the cavity, c) simulated gravity field in a flow, d) compressibility of the fluid. All these problems have been investigated analytically and obtained a number of calculated data.

Pore structure evolution in silica gel during aging/drying. III. Effects of surface tension

1992 ◽  
Vol 144 ◽  
pp. 32-44 ◽  
Author(s):  
Ravindra Deshpande ◽  
Duen-Wu Hua ◽  
Douglas M. Smith ◽  
C. Jeffrey Brinker
Keyword(s):  
Surface Tension ◽  
Pore Structure ◽  
Silica Gel ◽  
Structure Evolution

scholarly journals The liquid AlCu4TiMg alloy: thermophysical and thermodynamic properties

2020 ◽  
Vol 49 (1-2) ◽  
pp. 61-73
Author(s):  
YURIY PLEVACHUK ◽  
VASYL SKLYARCHUK ◽  
GERNOT POTTLACHER ◽  
THOMAS LEITNER ◽  
PETER ŠVEC SR. ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Surface Tension ◽  
Thermoelectric Power ◽  
Pure Aluminum ◽  
Point Contact ◽  
Calculated Data ◽  
Electromagnetic Levitation ◽  
Contact Method ◽  
Concentric Cylinder ◽  
Cylinder Method

In this study, some structure-sensitive thermophysical properties, namely, thermal conductivity, thermoelectric power, density and surface tension of liquid AlCu4TiMg alloy, as one of the most promising cast alloys to fabricate components for cars, aircraft and other complex engineering products, were investigated. Thermoelectric power was measured in a wide temperature range by the four-point contact method. Thermal conductivity was investigated by the steady-state concentric cylinder method. The oscillating drop technique combined with electromagnetic levitation was used for density and surface tension studies. The results obtained are compared with experimental and calculated data from literature for pure aluminum.

Estimation of Various Properties of CaO–“FeO”–SiO2 System at 1,673 K by Mass Triangle Model

2017 ◽  
Vol 36 (6) ◽  
pp. 581-585
Author(s):  
Yaxian Wang ◽  
Lijun Wang ◽  
Kuo-chih Chou
Keyword(s):  
Experimental Data ◽  
Surface Tension ◽  
Physicochemical Properties ◽  
Calculated Data ◽  
Sulfide Capacity ◽  
Metallurgical Process ◽  
New Model ◽  
Sio2 System ◽  
Limited Solubility ◽  
Contour Lines

AbstractIn consideration of great need for the physicochemical properties of slag systems in metallurgical process estimation, this work examined the possibility of predicting multi-properties by one model. The mass triangle model was applied to evaluate the density, viscosity, surface tension and sulfide capacity of CaO–“FeO”–SiO2 system at 1,673 K. Good agreements were achieved between calculated data and experimental data in the various properties. Meanwhile, the calculated contour lines successfully predicted the properties of slag within the limited solubility area. The new model thus is competitive and flexible when an integrated knowledge of a certain system is necessary.

scholarly journals Pengaruh Media terhadap Produksi Prodigiosin Isolat Bakteri Entomopatogen Serratia marcescens Asal Wereng Batang Cokelat

2016 ◽  
Vol 10 (2) ◽  
pp. 77
Author(s):  
Ifa Manzila ◽  
Tri P. Priyatno ◽  
Rahminovita Herlis ◽  
Iman Rusmana ◽  
I Made Samudra ◽  
...  
Keyword(s):  
Thin Layer ◽  
Serratia Marcescens ◽  
Silica Gel ◽  
Luria Bertani ◽  
Red Pigment ◽  
Purity Level ◽  
Red Color ◽  
The Family ◽  
The Media ◽  
Layer Chromatography

<p>Prodigiosin, the red pigment produced<br />by the bacterium Serratia marcescens, is a secondary<br />metabolite of the family tripyrrole that has been widely used<br />as an antibiotic in the multifunction treatment of<br />antibacterial as well as antifungal. This study was aimed to<br />study the effect of Luria-Bertani (LB) broth and nutrient<br />broth (NB) media suplemented with several concentrations<br />of FeSO4 and CaCO3 on the production and characteristic of<br />prodigiosin derived from S. marcescens. The study was<br />arranged in a completely randomized factorial design with<br />four replications. The LB and NB media were supplemented<br />with 0, 2.5, 5, and 10 mM CaCO3 and 0, 0.25, 0.5, and 1 mM<br />FeSO4. Results showed a red pigment produced by S.<br />marcescens when cultured on both LB and NB media. Redlike<br />pigmentation was varied when supplemented with<br />different concentration of Fe2+ and Ca2+. The higher the<br />concentration of Fe2+, the more intense the red color,<br />conversely, the higher the concentration of Ca2+, the lighter<br />the red color. The interaction was found between the media<br />and concentrations of CaCO3 and FeSO4 on the production<br />of prodigiosin. The highest prodigiosin production was<br />obtained on NB media supplemented with FeSO4.<br />Meanwhile, the addition of CaCO3 did not affect the<br />prodigiosin production. An addition of 1 mM FeSO4 to LB<br />and NB media produced crude prodigiosin of 486.0 mg/ml<br />and 489.0 mg/ml, respectively. Based on purification by<br />column chromatography using silica gel, the prodigiosin<br />production on LB and NB media was 378 mg/ml and 450<br />mg/ml, with the purity level of 77.8% and 92%, respectively.<br />Detection of prodigiosin by thin-layer chromatography using<br />silica gel showed the red pigment had Rf value of 0.83 and<br />bioautography assay showed there was an antibacterial<br />activity against Xanthomanas oryzae pv. oryzae.</p>

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