scholarly journals Tribotechnical Properties of Sintered Antifriction Aluminum-Based Composite under Dry Friction against Steel

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 180
Author(s):  
Nikolay M. Rusin ◽  
Alexander L. Skorentsev ◽  
Maksim G. Krinitcyn ◽  
Andrey I. Dmitriev
Keyword(s):  
Wear Resistance ◽  
Dry Friction ◽  
Aluminum Matrix ◽  
Press Mold ◽  
Vacuum Furnace ◽  
Two Phase ◽  
Friction Process ◽  
Tribotechnical Properties ◽  
Pin On Disk ◽  
Tin Content

The disadvantage of antifriction Al–Sn alloys with high tin content is their low bearing capacity. To improve this property, the aluminum matrix of the alloys was alloyed with zinc. The powder of Al–10Zn alloy was blended with the powder of pure tin in the proportion of 40/60 (wt.%). The resulting mixture of the powders was compacted in briquettes and sintered in a vacuum furnace. The sintered briquettes were subjected to subsequent pressing in the closed press mold at an elevated temperature. After this processing, the yield strength of the sintered (Al–10Zn)–40Sn composite was 1.6 times higher than that of the two-phase Al–40Sn one. The tribological tests of the composites were carried out according to the pin-on-disk scheme without lubrication at pressures of 1–5 MPa. It was established that the (Al–10Zn)–40Sn composite has higher wear resistance compared with the Al–40Sn one. However, this advantage becomes insignificant with an increase in the pressure. It was found that the main wear mechanism of the investigated composites under the dry friction process is a delamination of their highly deformed matrix grains.

Investigation of the relationship between wear resistance in dry friction and mechanical properties of sintered composites of the Al-Sn system

2020 ◽  
Vol 5 ◽  
pp. 55-65
Author(s):  
N.M. Rusin ◽  
◽  
A.L. Skorentsev ◽  
M.G. Krinitsyn ◽  
◽  
...  
Keyword(s):  
Wear Resistance ◽  
Surface Layer ◽  
Grain Boundaries ◽  
Dry Friction ◽  
Aluminum Matrix ◽  
Treatment Method ◽  
Mechanical And Tribological Properties ◽  
Angular Pressing ◽  
Silicon Doped ◽  
The Relationship

Effect of tin-insoluble alloying elements (Zn, Si) on the mechanical and tribological properties of the Al-40Sn sintered composite has been studied. Powder mixtures with alloying additions were sintered at a temperature above the melting point of tin (232°C). Sintered specimens had residual porosity, which negatively affected the strength, ductility, and wear resistance of the composite under dry friction. Compression in a closed die and equal channel angular pressing (ECAP) at a temperature of 250°C reduced the porosity of the material and significantly increased its strength and ductility. Regardless of the pressure treatment method, the compacted specimens showed good wear resistance. The main mechanism of composite wear is the exfoliation of matrix grains in the surface layer due to their shift along the tin interlayers in the direction of friction. The shear and peeling of grains were preceded by a strong deformation of the surface layer, in which the grain boundaries with tin interlayers were stretched in the direction of friction, that is, a layered structure was formed. Composites in which most of the grain boundaries of the aluminum matrix are oriented perpendicular to the sliding direction have the maximum wear resistance. A similar structure is formed in the plane of the material flow during ECAP processing. It was found that the wear resistance of a composite with a zinc-doped matrix is higher than with a silicon-doped matrix.

scholarly journals Investigation of Wear Behavior of Particle Reinforced AL/B4C Composites under Different Sintering Conditions

2020 ◽  
Vol 14 (1) ◽  
pp. 7-14
Author(s):  
İsmail Topcu
Keyword(s):  
Wear Resistance ◽  
Mechanical Alloying ◽  
Boron Carbide ◽  
Wear Behavior ◽  
Experimental Studies ◽  
Aluminum Matrix ◽  
Sintering Conditions ◽  
Microstructure Density ◽  
Pin On Disk ◽  
Favorable Conditions

In this study, the effects of different sintering conditions of boron carbide reinforced to aluminum matrix powder on microstructure, density and wear resistance by a mechanical alloying method were researched. Powders produced by mechanical alloying for eight hours at the atrial shaft were compressed with a cold isostatic press die under 350 MPa to obtain cylindrical composite specimens. The raw samples were sintered in high purity argon at 600, 625, 650 °C for 90 minutes. The wear behavior of the Al/B4C metal matrix composite was studied using a pin-on-disk wear tester. Under favorable conditions, it has been observed that reinforced boron carbide wear can be reduced by more than two decades. Various investigations have been made to relate this improved wear performance to reinforcement ratios. Aluminum abrasion test results showed that different types of abrasion occurred and that the abrasion resistance was increased by the change of the bubble rate. In the experimental studies that were carried out, it was observed that wear resistance increased with the proportion of boron carbide reinforced directly by the weight, and especially with a 15% B4C ratio depending on the increased reinforcement ratio.

Improvement of the Dry Friction and Wear Properties of the Si/SiC by Doping with Ni and PbO

2010 ◽  
Vol 658 ◽  
pp. 456-459
Author(s):  
Ke Zheng Sang ◽  
Wen Chao Wang ◽  
Gang Qiang Geng
Keyword(s):  
Silicon Carbide ◽  
Wear Resistance ◽  
Dry Friction ◽  
Lead Oxide ◽  
Friction And Wear ◽  
Sintering Process ◽  
Wear Properties ◽  
Dry Conditions ◽  
Friction And Wear Properties ◽  
Pin On Disk

The composite of silicon carbide with nickel and lead oxide was prepared by reaction sintered method. The phase compositions of the composites were studied by XRD, SEM and EDX. Friction and wear properties of the composites in dry conditions at the temperatures 15°C, 300°C and 600°C were tested using a pin-on-disk tribometer. The results showed that NiSi2 was formed and located between the SiC particles during sintering process. However the PbO was remained and distributed uniformly in the composites besides a little of Pb4SiO6 were formed. Friction coefficient of the composites decreased with the increase of the temperature and was about 0.2 at 600°C. And wear resistance of the composites was improved at all test temperatures comparing with that of the Si/SiC.

Wear resistance of gas-thermal coatings from steels and pseudoalloys of various compositions

2020 ◽  
pp. 371-375
Author(s):  
V.A. Kukareko ◽  
M.A. Belotserkovsky ◽  
A.N. Grigorchik ◽  
E.V. Astrashab
Keyword(s):  
Wear Resistance ◽  
Iron Oxides ◽  
Dry Friction ◽  
Phase State ◽  
Structural Phase ◽  
Surface Layers ◽  
Structural Phase State ◽  
Steel Coating ◽  
Tribotechnical Properties ◽  
Thermal Coating

Comparative study of the structural-phase state and tribotechnical properties of gas-thermal coatings from steels 08Mn2Si, 40Cr13, 95Cr18, as well as the pseudoalloys 08Mn2Si + bronze SiMn3-1, 08Mn2Si + AlSi12, 40Cr13 + bronze SiMn3-1, 95Cr18 + brass 63Cu, 95Cr18 + Al99.9 is carried out. It is shown that gas-thermal coating made of 95Cr18 steel has the highest wear resistance under conditions of dry friction due to the occurrence of intense martensitic γ → α transformation in its surface layers during friction. It is established that the pseudoalloys 08Mn2Si + bronze SiMn3-1 and 08Mn2Si + AlSi12 have higher wear resistance compared to the coating made of 08Mn2Si steel, which is associated with low content of iron oxides in the coatings of falsely alloys. For coatings from pseudoalloys 95Cr18 + brass 63Cu and 95Cr18 + Al99.9 lower wear resistance is characteristic in comparison with coating of 95Cr18 steel. The reduced wear resistance of pseudoalloys based on 95Cr18 steel is associated with their relatively low strength characteristics compared to steel coating of wire tool steel.

Structure and Tribotechnical Properties of Al-Sn Alloys Prepared by the Method of Liquid-Phase Sintering

2014 ◽  
Vol 1040 ◽  
pp. 166-170 ◽  
Author(s):  
N.M. Rusin ◽  
A.L. Skorentsev ◽  
E.A. Kolubaev
Keyword(s):  
Wear Resistance ◽  
Liquid Phase ◽  
Friction Coefficient ◽  
Dry Friction ◽  
Liquid Phase Sintering ◽  
Aluminium Matrix ◽  
Tribotechnical Properties ◽  
Pure Metals ◽  
Sintered Alloys ◽  
Skeleton Structure

The structure and tribotechnical properties of sintered Al-Sn alloys were studied. It was pointed that the sintering of pure metals powders allows save the skeleton structure of aluminium matrix at the enlarging concentration of tin up to 50% that twice higher its content in commercial alloys this system. It was established that the high Sn content in sintered alloys leads to their well wear resistance under the dry friction conditions, but it not has an influence on the value of friction coefficient.

Dry Friction and Wear Properties of Aluminum Matrix Composites Reinforced with 3D Network Ceramics

2007 ◽  
Vol 280-283 ◽  
pp. 1701-1704
Author(s):  
Jun Ping Yao ◽  
Wei Wang ◽  
Leping Chen ◽  
Bing Kun Chen ◽  
Lei Zhang
Keyword(s):  
Wear Resistance ◽  
Dry Friction ◽  
Friction And Wear ◽  
Volume Fraction ◽  
Normal Load ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Friction Coefficients ◽  
3D Network ◽  
The Matrix

A new 3D network ceramics (skeleton) reinforced aluminum alloy composites was designed and fabricated. Dry friction and wear behaviors of the new composites were investigated. The friction coefficients and wear rates of the matrix and the composites were measured at various temperatures and loads. The worn surfaces of the samples were examined with a scanning electron microscope, and the effect of the 3D network ceramics on the wear mechanisms was discussed accordingly. The composites had much better wear resistance than the matrix. The improvement in the wear resistance of the composites became more prominent at higher ceramics volume fraction, higher temperature, and larger normal load. Moreover, the friction coefficients of the composites remained stable with increasing normal load, especially at elevated temperature. It is suggested that the 3D network ceramics support the load applied onto the sliding surface, which not only restricts the plastic deformation and high temperature softening of the alloy, but also protects the oxide film(Al2O3) on the surface.

Effect of Copper Additives on Mechanical and Tribotechnical Properties of Sintered Composites Al-Sn

2016 ◽  
Vol 685 ◽  
pp. 295-299 ◽  
Author(s):  
N.M. Rusin ◽  
A.L. Skorentsev ◽  
A.V. Gurskikh
Keyword(s):  
Dry Friction ◽  
Sharp Decrease ◽  
Pure Metal ◽  
Wear Intensity ◽  
Compressive Deformation ◽  
Vacuum Furnace ◽  
Metal Powders ◽  
Angular Pressing ◽  
Tribotechnical Properties ◽  
Effect Of Copper

The mechanical and tribotechnical properties of sintered composites Al-Sn with small copper additives were studied. The sintering of compacts of pure metal powders mixture conducted in the vacuum furnace. It was established that copper additions up to 2% (wt.) lead to a significant increase in the strength and sharp decrease in a plasticity of Al-Sn composites. Because last, only Al-20Sn-1Cu alloy samples saved the integrity under the multiple equal channels angular pressing. The strength of treated samples significantly increased, but their compressive deformation did not exceed 0.5%. The wear intensity of Al-Sn-Cu samples under the dry friction was higher in comparison with Al-Sn composites.

Improving the wear resistance of hoe blades by modifying of restoration coatings

2019 ◽  
Vol 24 (94/4) ◽  
pp. 27-32
Author(s):  
T.S. Skoblo ◽  
I.N. Rybalko ◽  
A.V. Tihonov ◽  
T.V. Maltsev
Keyword(s):  
Wear Resistance ◽  
Transition Layer ◽  
Surface Coating ◽  
Dry Friction ◽  
Raw Materials ◽  
Bentonite Clay ◽  
Magnetic Fraction ◽  
Cutting Surface ◽  
Agricultural Machines ◽  
Modifying Additive

The possibility of using a non-magnetic fraction of a detonation charge with a diamond fraction from the disposal of ammunition to modify the restoration coatings of a natural product – clay and secondary raw materials — was studied. Four different coating variants were investigated. For this, a T-620 electrode was used with its additional modification by coating with bentonite clay, as well as with a non-magnetic fraction of the detonation charge and applying it in the form of a slip coating on the cutting surface of the cultivator. It is shown that the use of such additives allows to increase the resistance of the working tool of agricultural machines, reduces its tendency to damage due to the minimum penetration of the thin-walled product of the hoe blade and a decrease in the cross section of the transition layer and the level of stress. Each modifier makes changes to increase the microhardness to varying degrees. An increase in microhardness is observed on the surface of the coating and its gradual decrease to the transition layer. The surface coating with the additional introduction of bentonite clay in a liquid bath has the highest microhardness. Its microhardness varies from HV-50-1009.7 to HV-50-615.2. Similarly, the effect of the modifying additive of the detonation charge, the microhardness varies from HV-50-969.6 to HV-50-633.26. When clay or a mixture is introduced into the restoration coating, the wear resistance increases by 1.3 - 2 times with respect to the deposited surfacing only by the electrode and by 2 - 3 times to the initial material of the cultivator. It was found that the lowest coefficient is characteristic for dry friction, as well as for hydroabrasive, for samples with additional modification with clay or a detonation charge

EVALUATION OF TRIBOTECHNICAL PROPERTIES OF THE COATING OBTAINED BY ELECTRIC SPARK HARDENING

2020 ◽  
Vol 4 (141) ◽  
pp. 157-163
Author(s):  
IL’YA ROMANOV ◽  
◽  
ROMAN ZADOROZHNIY
Keyword(s):  
Wear Resistance ◽  
Reference Sample ◽  
Optical Microscope ◽  
Research Purpose ◽  
Tribotechnical Properties ◽  
Uncoated Surface ◽  
Before And After ◽  
Materials Used ◽  
Friction Track

When applying coatings using various methods on the surfaces of moving parts that work in joints, it is important to make sure that the coatings are strong and wear-resistant in order to return them to their original resource. All existing hardening technologies and materials used to perform coatings have their own characteristics, therefore, the quality of the resulting coatings can be judged only after specific tests. (Research purpose) The research purpose is in evaluating the properties of the coating obtained by the method of electric spark hardening, and its ability to resist friction and mechanical wear. (Materials and methods) Authors conducted tests on the basis of the "Nano-Center" center for collective use. A coating was applied on the BIG-4M unit with a VK-8 hard alloy electrode, tribological properties were evaluated on a CSM Instruments TRB-S-DE-0000 tribometer, the width of the friction track was measured after the test using an inverted OLYMPUS gx51 optical microscope, and samples were weighed before and after the test on a VLR-200 analytical balance. Conducted research in accordance with GOST 23.224-86 and RD 50-662-88 guidelines. (Results and discussion) The article presents performed tests on the run-in and wear resistance of the coating. The samples were worked on with a step-by-step increase in the load. During the tests, the friction force was drawed on the diagram. Authors compared the results with the reference sample, an uncoated surface. (Conclusions) The resulting coating has better run-in and wear resistance compared to the standard, and the increase in wear resistance in dry friction conditions is very significant.

scholarly journals Effect of Boron Carbide Addition on Wear Resistance of Aluminum Matrix Composites Fabricated by Stir Casting and Hot Rolling Processes

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 989
Author(s):  
Donghyun Lee ◽  
Junghwan Kim ◽  
Sang-Kwan Lee ◽  
Yangdo Kim ◽  
Sang-Bok Lee ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Boron Carbide ◽  
Hot Rolling ◽  
Rolling Direction ◽  
Aluminum Matrix ◽  
Stir Casting ◽  
Aluminum Matrix Composites ◽  
Wear Depth ◽  
Wear Properties ◽  
B4c Particles

In this study, to evaluate the effect of boron carbide (B4C) addition on the wear performance of aluminum (Al), Al6061 and 5, 10, and 20 vol.% B4C/Al6061 composites were manufactured using the stir casting and hot rolling processes. B4C particles were randomly dispersed during the stir casting process; then, B4C particles were arranged in the rolling direction using a hot rolling process to further improve the B4C dispersion and wear resistance of the composites. Furthermore, a continuous interfacial layer between B4C and the Al6061 matrix was generated by diffusion of titanium (Ti) and chromium (Cr) atoms contained in the Al6061 alloy. Wear depth and width of the composites decreased with increasing B4C content. Furthermore, with B4C addition, coefficient of friction (COF) improved as compared with that of Al6061. The results indicate that interface-controlled, well-aligned B4C particles in the friction direction can effectively increase the wear properties of Al alloys and improve their hardness.

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