Enhanced Tribological Properties of an Advanced Al–Al2O3 Composite Infiltrated With a Tin-Based Alloy

2021 ◽  
Vol 143 (6) ◽  
Author(s):  
Lenko Stanev ◽  
Mihail Kolev ◽  
Ludmil Drenchev
Keyword(s):  
Tribological Properties ◽  
Hybrid Material ◽  
Operating Conditions ◽  
Al Alloy ◽  
Porous Composite ◽  
Aluminum Composite ◽  
Tribological Tests ◽  
Replication Method ◽  
Porous Skeleton ◽  
Pin On Disk

Abstract In this article, a new hybrid material is elaborated, which combines the advantages of the mechanically more resistive alloy-based composites and the effective lubricating properties of tin-based alloys with the purpose of enhancing the tribological properties and especially to enhance resistance under extreme and transient operating conditions for the application of sliding bearings. The hybrid material consists of an aluminum composite skeleton obtained via a replication method with NaCl particles as spacers and a tin-based alloy that is infiltrated into the composite skeleton. The hybrid material is characterized in respect to its microstructure and tribological parameters, such as the wear-rate and coefficient of friction. Data from the conducted tribological tests using the pin-on-disk method under dry friction conditions are obtained and compared with the results of the same tribological tests for the Al alloy, Al alloy-based porous skeleton, Al alloy-based porous composite skeleton, and tin-based alloy. It is concluded that the new hybrid material possesses superior tribological properties in comparison with the tin-based alloy, Al alloy, Al alloy-based porous skeleton, and Al alloy-based porous composite skeleton.

scholarly journals The tribological properties of single-layer hybrid PTFE/Nomex fabric/phenolic resin composites underwater

Open Physics ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 609-617
Author(s):  
Liu Ying ◽  
Gao Gengyuan ◽  
Jiang Dan ◽  
Yin Zhongwei
Keyword(s):  
Abrasive Wear ◽  
Tribological Properties ◽  
Phenolic Resin ◽  
Single Layer ◽  
Operating Conditions ◽  
Dry Sliding ◽  
Resin Composites ◽  
Binding Force ◽  
Fabric Composites ◽  
Pin On Disk

Abstract In this study, the tribological properties of hybrid polytetrafluoroethylene (PTFE)/Nomex fabric/phenolic resin composites were investigated under three operating conditions: dry sliding, dry sliding after soaking in water for 12 h, and water dripping lubrication. The friction coefficient (COF) was measured with a pin-on-disk tribometer. The wear surface was analyzed with a scanning electron microscope. The results show that water weakens the tribological properties of single-layer hybrid PTFE/Nomex fabric/phenolic resin composites. The fabric composites show slight abrasive wear with stable COF under dry sliding conditions, significant abrasive wear with oscillating COF after soaking, and destruction with severely oscillating COF under water dripping lubrication. Generally, water weakens the effect in two ways. The first is weakening the binding force between phenolic resin and Nomex fiber. The second is that Nomex fiber absorbs water and expands, which reduces its strength. Finally, the ideas to improve the tribological properties under water dripping lubrication are presented.

scholarly journals Impact of Operating Time on Selected Tribological Properties of the Friction Material in the Brake Pads of Passenger Cars

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 884
Author(s):  
Andrzej Borawski
Keyword(s):  
Tribological Properties ◽  
Operating Time ◽  
Friction Material ◽  
Operating Conditions ◽  
Direct Impact ◽  
Passenger Cars ◽  
Wear Factor ◽  
Brake Pads ◽  
Road Users ◽  
The Coefficient Of Friction

Braking systems have a direct impact on the safety of road users. That is why it is crucial that the performance of brakes be dependable and faultless. Unfortunately, the operating conditions of brakes during their operating time are affected by many variables, which results in changes in their tribological properties. This article presents an attempt to develop a methodology for studying how the operating time affects the value of the coefficient of friction and the abrasive wear factor. The Taguchi method of process optimization was used to plan the experiment, which was based on tests using the ball-cratering method. The results clearly show that the degree of wear affects the properties of the friction material used in the production process of brakes.

scholarly journals Analysis and Comparative Assessment of Basic Tribological Properties of Selected Polymer Composites

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 75 ◽  
Author(s):  
Jerzy Jozwik ◽  
Krzysztof Dziedzic ◽  
Marcin Barszcz ◽  
Mykhaylo Pashechko
Keyword(s):  
Polymer Composites ◽  
Friction Force ◽  
Tribological Properties ◽  
Friction Pair ◽  
Computer Software ◽  
Operating Conditions ◽  
The Coefficient Of Friction ◽  
Cast Polyamide ◽  
Friction Path ◽  
Materials Used

Phenomena occurring in the contact area between two mating bodies are characterised by high complexity and variability. Comparisons are usually made between parameters such as the coefficient of friction, friction force, wear and temperature in relation to time and friction path. Their correct measurement enables the proper evaluation of tribological properties of materials used in the friction pair. This paper concerns the measurements of basic tribological parameters in the friction of selected polymer composites. Knowing the tribological properties of these composite materials, it will be possible to create proper operating conditions for kinematic friction pairs. This study investigated the coefficients of friction, friction force and temperatures of six polymer composites: cast polyamide PA6 G with oil, PA6 G with MoS2, polyoxymethylene POM with aluminium, polyethylene terephthalate PET with polytetrafluoroethylene PTFE, PTFE with bronze, and PTFE with graphite. The friction surface was also examined using an optical system and computer software for 3D measurements. As a result, PA6-G with oil was found to be the best choice as a composite material for thin sliding coatings.

Comparison in Tribological Properties of YBa2Cu3OX/Ag and Bi2Sr2CaCu2OX/Ag Self-Lubricating Composites

2011 ◽  
Vol 291-294 ◽  
pp. 34-40
Author(s):  
Hua Tang ◽  
Wen Jing Li ◽  
Chang Sheng Li
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Room Temperature ◽  
Superconducting Transition ◽  
Friction Test ◽  
Average Value ◽  
Structure And Morphology ◽  
Disk Friction ◽  
Pin On Disk ◽  
Self Lubricating Composites

The YBa2Cu3Ox/Ag and Bi2Sr2CaCu2Ox/Ag self-lubricating composites were prepared using powder metallurgic method. The crystal structure and morphology of the as-synthesized samples were characterized by XRD and SEM. The YBa2Cu3Ox/Ag and Bi2Sr2CaCu2Ox/Ag self-lubricating composites were found to compose of superconductor phase and Ag phase. The tribological properties from ultra-low temperature to room temperature of the composites were studied by pin-on-disk friction test. It was found that the friction coefficients of pure YBa2Cu3Ox(YBCO) and Bi2Sr2CaCu2Ox(BSCCO) were both dropped abruptly when the temperature cooled below the superconducting transition temperature. At room temperature, the friction coefficient of pure YBa2Cu3Oxis 0.68~0.95, when mixing 15wt% Ag, the friction coefficient of the sample decreased to the lowest value 0.11. The friction coefficient of pure Bi2Sr2CaCu2Ox is 0.15~0.17, When Ag content reach 10wt%, the coefficient was lowest (average value is 0.13). The addition of appropriate amount of Ag obviously improve the tribological property of YBCO, while only slightly meliorate that of BSCO. On the other hand, the YBCO/Ag composites exhibit better tribological properties than BSCCO/Ag composites at higher load under the same experimental condition.

Influence of the particle size on the physical, mechanical and tribological properties of composites for brake pads

2021 ◽  
pp. 36-40
Author(s):  
F.F. Yusubov
Keyword(s):  
Particle Size ◽  
Composite Materials ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Phenol Formaldehyde ◽  
Environmentally Friendly ◽  
Brake Pads ◽  
Mechanical And Tribological Properties ◽  
Pin On Disk ◽  
Properties Of Composites

Tribotechnical indicators of environmentally friendly frictional composite materials with phenol-formaldehyde matrix are studied. Friction tests were carried out on a MMW-1 vertical tribometer according to the pin-on-disk scheme. Keywords: brake pads, composites, friction and wear, plasticizers, degradation, porosity. [email protected]

Carbon Nanotubes Improves the Tribological Properties of Ni60/Al2O3 Coatings

2013 ◽  
Vol 785-786 ◽  
pp. 864-871
Author(s):  
Shu Xiao ◽  
Xi Yun Cheng ◽  
De Gui Ma
Keyword(s):  
Carbon Nanotubes ◽  
Tribological Properties ◽  
Microstructural Characterization ◽  
Flame Spraying ◽  
Dual Roles ◽  
Wear Rates ◽  
Transmission Electron ◽  
Pin On Disk ◽  
Wear Tests ◽  
Original Coating

Carbon nanotubes (CNTs) was introduced into Ni60/Al2O3coating by flame spraying. The effect of adding CNTs on the tribological properties of the coating was studied by varying the CNTs content as 0.0, 1.5, 3.0 and 4.5 wt% in the Ni60/Al2O3powders. The microhardness tester was used to measure the microhardness of the coating. Wear tests were performed on a pin-on-disk tribometer, to evaluate the tribological properties of the Ni60/Al2O3/CNTs coatings. Microstructural characterization was performed using scanning and transmission electron microscopy. Ni60/Al2O3/CNTs coatings revealed a lower wear rate and friction coefficient compared with the original coating, and their wear rates and friction coefficients showed a decreasing trend with increasing mass fraction of CNTs within the range from 0 to 3.0 wt% due to the effects of the reinforcement and reduced friction of CNTs. The results showed that the CNTs played dual roles in improving the tribological performance of the coating, indirectly by influencing the microstructure and mechanical properties of the coating and directly by acting as a lubricating medium.

Analysis of tribological properties of graphite and aluminum composite materials prepared by powder metallurgy technique

2020 ◽  
Vol 10 (5) ◽  
pp. 663-670
Author(s):  
Zhigang Wang ◽  
Jun Li ◽  
Daquan Li
Keyword(s):  
Composite Materials ◽  
Powder Metallurgy ◽  
Friction Coefficient ◽  
Tribological Properties ◽  
Utilization Rate ◽  
Powder Metallurgy Technique ◽  
Aluminum Composite ◽  
Powder Metallurgy Process ◽  
Metallurgy Process ◽  
Composite Samples

In order to make full use of the wear resistance and antifriction of the mixed reinforced particles, improve the performance and utilization rate of the composite material, and reduce its wear amount, in this study, graphite and aluminum composite materials with different graphite concentration were prepared by powder metallurgy process. On this basis, the influence of different graphite concentration on the friction coefficient and wear amount of composite samples and different load on the wear amount of composite materials were discussed and analyzed. The results show that with the increase of graphite content, the friction coefficient and wear amount of the composite will decrease correspondingly. When the load is less than 30 N, the wear curve of the sample changes steadily. When the load is more than 30 N, the wear will increase sharply. Therefore, the analysis of the tribological properties of the graphite and aluminum composites based on the powder metallurgy process plays an important role in improving the utilization rate of the composite and reducing its wear.

scholarly journals The tribological properties of Al-brasses in various environments

2017 ◽  
Vol 61 (3) ◽  
pp. 91-94
Author(s):  
M. Lovíšek ◽  
T. Liptáková ◽  
J. Bronček ◽  
S. Dundeková
Keyword(s):  
Tribological Properties ◽  
Room Temperature ◽  
Tribological Behavior ◽  
Cold Drawing ◽  
Operating Conditions ◽  
Air Cooling ◽  
Normal Loading ◽  
Dry Air ◽  
Similar Chemical ◽  
Made In

Abstract Tribological properties of Al-brass pipes of various producers were studied in different environments. The tested brasses have very similar chemical composition, but they differ in microstructure due to mainly by heat treatment after cold drawing. Microstructure as well as roughness of surface influence chemical and mechanical properties which are important in operating conditions. The experiments of tribological behavior were made in various environments, dry air, cooling treated water and 3.5 % solution of NaCl at room temperature 21 ± 2°C. The tribological tests were carried out on the Linear Tribometer at normal loading 5 N by the method ball on plate for the duration of 5500 s. The measured friction coefficients were evaluated by the program DIAdem and the diagrams were created from signal generated by software NSignal Express

Modification of Al alloy nanopowder with Nb nanopowder on its thermal and tribological properties with SPS for power conductors

2019 ◽  
Vol 6 (11) ◽  
pp. 116592
Author(s):  
Chika Oliver Ujah ◽  
Patricia Popoola ◽  
Olawale Popoola ◽  
Victor Aigbodion
Keyword(s):  
Tribological Properties ◽  
Al Alloy

Tribological Properties of MWCNTs Strengthened Aluminum Composite Fabricated by Induction Melting

2015 ◽  
Vol 1101 ◽  
pp. 62-65 ◽  
Author(s):  
Muhammad Mansoor ◽  
Muhammad Shahid
Keyword(s):  
Tribological Properties ◽  
Molten Aluminum ◽  
Structural Features ◽  
Induction Melting ◽  
Multiwalled Carbon ◽  
Aluminum Composite ◽  
Metallographic Examination ◽  
Melting Technique ◽  
The Matrix ◽  
Wear Condition

<span><p>Aluminum-Multiwalled carbon nanotubes (Al-CNTs) composite was fabricated using air induction melting technique. The nanotubes were dispersed in molten aluminum using innate string action of induction heating at 760 °C. A heavy fluxing condition was used to avoid oxidation of the nanotubes and molten aluminum. The nanotubes were satisfactorily dispersed in the matrix as observed during metallographic examination using scanning electron microscope.<br /> <br /><span style="font-size: 10px;">  The tribological properties (i.e. coefficient of friction and wear rate) of the Al-CNTs composite were investigated using ball-on-disk machine under dry wear condition at 2 cm/sec speed and 3N load. It was observed that both of the tribological parameters exhibited decreasing trends with increasing contents of the nanotubes, which was due to the self lubricating and structural features of the nanotubes. Improved tribology of the composite was the attribute of appreciable dispersion of the nanotubes in the matrix besides their exceptional mechanical properties and reinforcement.</span></p>

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