Tribotechnical characteristics of hard alloys in sliding friction units

2020 ◽  
pp. 87-97
Author(s):  
K. D. Khromushkin ◽  
B. G. Ushakov ◽  
A. V. Kochergin ◽  
R. A. Suleev ◽  
O. N. Parmenova
Keyword(s):  
Experimental Data ◽  
Sliding Friction ◽  
Heating Temperature ◽  
Hard Alloys ◽  
Friction Units ◽  
Wear And Friction ◽  
Friction Path ◽  
Friction Parameters ◽  
Tribotechnical Characteristics ◽  
Temperature Surface

The paper presents experimental data on the study of the friction parameters of hard alloys in sliding friction units, including the heating temperature, surface roughness, wear and friction coefficient, depending on the duration of the test and the friction path.

Influence of the initial roughness of the antifriction carbons surface on tribotechnical characteristics and running-in coating efficiency

2021 ◽  
pp. 158-169
Author(s):  
I. V. Lishevich ◽  
A. V. Anisimov ◽  
A. S. Savelov ◽  
A. S. Sargsyan ◽  
M. Yu. Sobolev
Keyword(s):  
Surface Roughness ◽  
Friction Surface ◽  
Sliding Friction ◽  
Friction Units ◽  
Carbon Plastics ◽  
Coating Efficiency ◽  
Optimal Surface ◽  
Mechanical Cutting ◽  
The Relationship ◽  
Tribotechnical Characteristics

The roughness of the friction surface of antifriction carbons used in sliding friction units lubricated with water affects the tribotechnical characteristics during the running-in process. This article experimentally substantiates the range of optimal surface roughness formed during mechanical cutting of carbon plastics in terms of tribotechnical efficiency. The results of a series of tribotechnical tests using various methods under various conditions (contact pressure, sliding speed, counterbody materials) are presented. The relationship between the initial roughness and the effectiveness of a running-in coating based on FORUM® polytetrafluoroethylene powder is established.

Formation of MAO-coatings of high thickness on titanium alloys and evaluation of tribological properties in friction pair with bronze

2021 ◽  
pp. 41-51
Author(s):  
V. G. Ivanov ◽  
V. S. Bublikov
Keyword(s):  
Experimental Data ◽  
Titanium Alloys ◽  
Tribological Properties ◽  
Sliding Friction ◽  
Friction Pair ◽  
Microarc Oxidation ◽  
Tribological Characteristics ◽  
Friction Units ◽  
Antifriction Coatings ◽  
Oxidation Parameters

The article presents experimental data on the effect of microarc oxidation parameters on the thickness and structure of the MAO-coating and its tribological characteristics in friction against bronze. The appli- cation of thick antifriction coatings by the MAO-method on titanium alloys has been developed. The possibility of using MAO-coatings of high thickness in sliding friction units was investigated.

scholarly journals Aluminum Composite Materials Providing Extended Service Life

2021 ◽  
pp. 44-54
Author(s):  
Yulia A. Kurganova ◽  
Alexey G. Kolmakov ◽  
Sergey V. Kurganov
Keyword(s):  
Dry Friction ◽  
Sliding Friction ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composite ◽  
Aluminum Composite ◽  
Phase Mixing ◽  
Friction Units ◽  
Sic Particles ◽  
Tribotechnical Characteristics ◽  
Better Than

Hardness and tribotechnical characteristics were investigated under conditions of dry sliding friction on steel obtained by liquid-phase mixing of Aluminum-Matrix Composite (AMC) materials based on aluminum alloys AK12, D16, V124, AL9, AL25, reinforced with silicon carbide SiC particles with a size of 28 μm with a content of 5, 10 or 15% by volume. AMC performed better than matrix alloys and the commonly used antifriction aluminum alloy AOM 2-1. The dry friction coefficient was 1.5-3 times lower on average, and the volumetric wear rate was 5-9 times lower. An increase in the content of SiC particles in the composite from 5 to 20 vol.%. As a rule, leads to an improvement in the tribotechnical characteristics. The composites obtained have shown a sufficiently high operational suitability for work in friction units with steels both in dry friction and in friction with lubrication.

Evolution of the Mechanical Properties of the Surface Layers of Aluminum Alloys under the Conditions of Sliding Friction

2021 ◽  
Vol 901 ◽  
pp. 219-225
Author(s):  
Elena V. Torskaya ◽  
Alexey M. Mezrin
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Sliding Friction ◽  
Surface Layers ◽  
Before And After ◽  
Wear And Tear ◽  
Friction Path ◽  
Compliant Layer

Mechanical properties of surface layers of aluminum alloys before and after friction tests are studied by nanoindentation. The influence of the composition of the alloys on these properties is analyzed. It is obtained that as a result of wear and tear, relatively compliant layer is formed on the surface of one of the alloys. Another sample demonstrates relatively rigid film at the surface of the friction path. Conclusions about different mechanisms of the wear and tear of alloys are made based on the analysis.

scholarly journals INFLUENCE OF SURFACE HEATING TEMPERATURE ON EXTERNAL HEAT-EXCHANGE IN WET VIBRO-FLUIDIZED BED

2018 ◽  
Vol 59 (5) ◽  
pp. 77
Author(s):  
Boris G. Sapozhnikov ◽  
Anastasiya M. Gorbunova ◽  
Yuliya O. Zelenkova ◽  
Nina P. Shiryaeva
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Heat Transfer Coefficient ◽  
Heat Exchange ◽  
Fluidized Bed ◽  
Heating Temperature ◽  
Heating Surface ◽  
External Heat ◽  
Porous Particles ◽  
External Heat Transfer

Experimental data are given on the influence of the temperature of the heating surface, placed to a wet vibro-fluidized bed of non-porous particles, and higher that the saturation temperatures on the external heat-transfer coefficient at conductive supply of the heat.

scholarly journals Parameters of temperature disturbance triggering the propagation of the quench front on an extremely overheated surface

2021 ◽  
Vol 2119 (1) ◽  
pp. 012079
Author(s):  
I P Starodubtseva ◽  
A N Pavlenko
Keyword(s):  
Experimental Data ◽  
High Temperature ◽  
Front Propagation ◽  
Solid Contact ◽  
Temperature Disturbance ◽  
Metal Plates ◽  
Leidenfrost Temperature ◽  
Dynamical Pattern ◽  
Temperature Surface

Abstract The results of computational experiments simulating the triggering of the quench front propagation on the superheated vertically oriented metal plates are presented. The plates are quenched by a gravitationally flowing down liquid nitrogen film. The temperature of the test samples at the beginning of the process was higher than the critical temperature and the Leidenfrost temperature, which means that direct long-term liquid-solid contact is impossible. For this reason, the front is initially motionless. As a result of numerical simulation, a dynamic pattern of the quench front propagation on a high-temperature surface was obtained. Analysis of the results allowed to find the realistic values of heat sink into the cooling medium, as well as the parameters of the local temperature disturbance, its spatial extent and amplitude, at which the conditions are created for triggering the process of quench front propagation on the high-temperature surface. Direct comparison of the numerical simulations results with experimental data on the velocity, geometry of the quench front and on the dynamical pattern of the process confirmed the reliability of the results obtained.

Improvement of Wear Resistance of UHMWPE by Adding Solid Lubricating Fillers

2016 ◽  
Vol 712 ◽  
pp. 155-160 ◽  
Author(s):  
Sergey V. Panin ◽  
Lyudmila А. Kornienko ◽  
Vladislav O. Alexenko ◽  
Larisa R. Ivanova
Keyword(s):  
Wear Resistance ◽  
Dry Friction ◽  
Sliding Friction ◽  
Weight Fraction ◽  
Dry Sliding ◽  
Polyethylene Matrix ◽  
Permolecular Structure ◽  
Uhmwpe Composites ◽  
Ultra High Molecular Weight ◽  
Tribotechnical Characteristics

For estimating effectiveness of adding solid fillers for composites with ultra-high molecular weight polyethylene matrix tribotechnical characteristics of UHMWPE mixture with graphite, molybdenum disulfide and polytetrafluoroethylene were investigated under dry friction, boundary lubrication and abrasion. The optimum filler weight fraction was determined in terms of increasing wear resistance. Permolecular structure and surface topography of wear tracks for UHMWPE composites with different weight fraction of the fillers was studied. The mechanisms of wear of polymeric composites “UHMWPE-graphite”, “UHMWPE-PTFE” and “UHMWPE-MoS2” under dry sliding friction and abrasive wear are discussed.

Deformational Cutting as a Basis for Creating Self-Lubricating Sliding Friction Units

2021 ◽  
Vol 2021 (13) ◽  
pp. 1786-1791
Author(s):  
N. N. Zubkov ◽  
S. G. Vasil’ev ◽  
D. V. Tsukanov
Keyword(s):  
Sliding Friction ◽  
Friction Units ◽  
Deformational Cutting

Influence of sliding bearing design on efficiency of the fluoroplast macromodifier for antifriction carbon plastics

2021 ◽  
pp. 65-75
Author(s):  
I. V. Lishevich ◽  
A. V. Anisimov ◽  
G. I. Nikolaev ◽  
A. S. Savelov ◽  
A. S. Sargsyan
Keyword(s):  
Sliding Friction ◽  
Friction Unit ◽  
Sliding Bearings ◽  
Friction Zone ◽  
Reinforced Plastics ◽  
Friction Units ◽  
Carbon Plastics ◽  
Key Factor ◽  
Fiber Reinforced Plastics ◽  
Bearing Design

The paper presents the results of laboratory and bench tests of UGET and FUT antifriction carbon plastics macro modified with PTFE. The efficiency (friction coefficient reduction) of this modification of carbon fiber reinforced plastics has been confirmed. The dependence of the method’s efficiency on the design of sliding friction units has been established. The plastic deformation of the fluoroplastic is the key factor that determines the effectiveness of the modifier when designing sliding bearings. The design of the friction unit should exclude the pressure gradient in the fluoroplastic protectors and prevent the possibility of an uncontrolled exit of the fluoroplastic from the friction zone.

Multi Parameter Sliding Test Result Evaluation for the Selection of Material Pair for Wear Resistant Components of a Hydraulic Motor Dedicated for Use with Environmentally Friendly Working Fluids

2014 ◽  
Vol 225 ◽  
pp. 115-122 ◽  
Author(s):  
Jacek Łubiński ◽  
Paweł Śliwiński
Keyword(s):  
Sliding Friction ◽  
Input Parameter ◽  
Field Testing ◽  
Maximum Load ◽  
Hydraulic Motor ◽  
Water Emulsion ◽  
Multiple Parameters ◽  
Materials Used ◽  
Friction Parameters ◽  
Oil In Water Emulsion

In the paper the method and results are presented of the testing of tribological performance of a number of hard materials available commercially. The tests consisted in unidirectional sliding with liquid lubrication. The load and velocity regime chosen were similar to a standard four-ball lubricity test with constant velocity and load increasing over time. The regime was modified in such a way that over the initial part of the test both the velocity and load were linearly increased until a certain stable level of each input parameter was reached and the test was then continued till the termination due to chosen criteria. The materials used were high alloy tool steels and sintered carbides, normally used in working of metals by cutting. The lubricants environmentally inert or friendly fluids: water, mineral oil-in-water emulsion and vegetable oil. In the tests, typical sliding friction parameters were recorded, later evaluated on the basis of multiple parameters observable within the test such as e.g. maximum load and velocity reached, calculated maximum surface pressure or presence and amplitude of friction induced vibrations. In the group of material/material/lubricant combinations a ranking was created for each parameter in the assessment set by awarding points for performance. Best performance was granted the least amount of points. Overall performance was then judged by the accumulated number of points. The materials, which were evaluated as performing best have been chosen as input materials for the design and manufacture of a prototype motor for later laboratory and field testing.

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