INFLUENCE OF LASER BORIDING ON THE FRICTION AND WEAR OF SLIDING COUPLES WITH BEARING ALLOYS

2019 ◽  
Vol 27 (01) ◽  
pp. 1950084 ◽  
Author(s):  
KAZIMIERA DUDEK ◽  
WOJCIECH SZCZYPINSKI-SALA ◽  
JANUSZ LUBAS
Keyword(s):  
Surface Layer ◽  
Friction Coefficient ◽  
Contact Area ◽  
Friction And Wear ◽  
Engine Oil ◽  
Amorphous Boron ◽  
Laser Remelting ◽  
Steel Aisi ◽  
Bearing Alloy ◽  
Lubricating Properties

The present study discusses the influence of laser borided surface layer on the parameters of sliding couples lubricated by engine oil. The borided layer was created by laser remelting of a surface layer of steel samples coated with amorphous boron. The study of friction, wear, and lubrication was conducted on the pairs made of steel AISI 5045 and SAE-783 and SAE-48 bearing alloys which were lubricated with 15W/40 engine oil. The research showed important differences in the friction coefficient and temperature in the tested couple with laser borided surface layer. In the couples containing the counterparts with SAE-783 bearing alloy, the tested parameter of friction was higher than in the couple composed of counterparts with SAE-48 bearing alloy. The counterparts with SAE-48 showed more intensive wear in contact with the laser borided surface layer than the counterpart with SAE 783. The process of friction at the contact area of the sliding couple with laser borided surface layer leads to the destruction of the lubricating properties of 15W/40 engine oil and reduces its resistance to scuffing and seizure.

scholarly journals Experimental Analysis of Tribological Processes in Friction Pairs with Laser Borided Elements Lubricated with Engine Oils

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5810
Author(s):  
Janusz Lubas ◽  
Wojciech Szczypiński-Sala ◽  
Paweł Woś ◽  
Edyta Zielińska ◽  
Krzysztof Miernik
Keyword(s):  
Surface Layer ◽  
Friction And Wear ◽  
Sliding Friction ◽  
Engine Oil ◽  
Laser Remelting ◽  
Wear Process ◽  
Engine Oils ◽  
Bearing Alloy ◽  
Tribological Parameters ◽  
Lubricating Properties

The present study discusses the influence of engine oils on the tribological parameters of sliding couples with laser borided surface layer. The borided layer was formed on specimens made from AISI 5045 steel by laser remelting of a surface layer coated with amorphous boron. The sliding friction and wear process was carried out on the pairs with AISI 5045 steel and SAE-48 bearing alloys which were lubricated with 5W-40 and 15W-40 engine oils. The investigation showed significant differences in the friction coefficient and temperature in the tested pairs with the laser borided surface layer. In the couples lubricated with 5W-40 engine oil, the tested parameter of friction was higher than in the couples lubricated with 15W-40 engine oil. The couples lubricated with 5W-40 engine oil showed more intensive wear of SAE-48 bearing alloy in contact with the laser borided surface layer than the pairs lubricated with 15W-40 engine oil. The laser borided surface layer used in friction pairs leads to the destruction of the lubricating properties of engine oils and reduces its resistance to scuffing.

INFLUENCE OF ENGINE OIL ON THE FRICTION AND WEAR OF A SURFACE LAYER WITH BORON

Tribologia ◽  
2017 ◽  
Vol 272 (2) ◽  
pp. 107-112
Author(s):  
Janusz LUBAS ◽  
Wojciech SZCZYPIŃSKI-SALA
Keyword(s):  
Surface Layer ◽  
Contact Area ◽  
Friction And Wear ◽  
Friction Pair ◽  
Mineral Oil ◽  
Engine Oil ◽  
Synthetic Oil ◽  
Start Up ◽  
Higher Temperature ◽  
Bearing Alloy

The aim of the present work is to determine the influence of surface layers with boron and engine oil on the processes of friction and wear in friction pairs. The ring samples with a borided surface layer cooperated under test conditions with counterparts made with CuPb30 bearing alloy. During the tests, the friction pairs were lubricated with 15W/40 Lotos mineral oil and 5W/40 Lotos synthetic oil. The friction pairs lubricated by Lotos synthetic oil a generate stronger friction force and higher temperature in the contact area of friction pairs, as compared to the pairs lubricated by Lotos mineral oil. Lubrication of the friction pairs by mineral oil in the start-up phase causes faster stabilization of the friction conditions than in the case of lubrication by synthetic oil. The wear of bearing alloy was lower when lubricated by Lotos mineral oil than by Lotos synthetic oil. The process of friction in the contact area of the friction pair leads to the destruction of the lubricant and the reduction of its operational properties, especially at high temperatures.

Friction Properties Study of Metals by Principal Component Analysis

2014 ◽  
Vol 711 ◽  
pp. 231-234
Author(s):  
Zheng Zhu Zhou ◽  
Xiao Yi Jin ◽  
Xiang Wei Zhang ◽  
Yu Yi Lin
Keyword(s):  
Principal Component Analysis ◽  
Friction Coefficient ◽  
Contact Area ◽  
Friction And Wear ◽  
Principal Component Regression ◽  
Principal Component ◽  
Component Analysis ◽  
Linear Regression Models ◽  
New Methods ◽  
Sliding Distance

Based on MMW-1A vertical multifunctional friction and wear tester for the study,taking steel 45 as the research object, randomly changing the experiment load, speed, sliding distance and the size of the contact area, then the data we collect are processed and analyzed by principal component analysis, and obtained linear regression models by principal component regression, regression model has been tested with good fitting effect. The results showed that the principal component analysis method is also suitable for experimental study of friction and wear, explore new methods in the analysis of tribology. It shows that load, speed and sliding distance have a weakening effect on the friction coefficient, on the contrary, the contact area has a promoting role to the friction coefficient.

Study on Tribological Performance of Al2O3 Particle Reinforced the Al-Sn Bearing Alloy

2014 ◽  
Vol 633-634 ◽  
pp. 137-140 ◽  
Author(s):  
Bin Sui ◽  
Jian Min Zeng ◽  
Ping Chen ◽  
Li Hua Liang ◽  
Wu Kui Gan ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Grain Boundary ◽  
Friction And Wear ◽  
Testing Machine ◽  
Tribological Performance ◽  
Wear Testing ◽  
Improve Performance ◽  
Computer Controlled ◽  
Bearing Alloy

In order to improve performance of Al-Sn bearing alloys, a new Al2O3/Al-Sn composite was fabricated through in-situ reaction between Al and SiO2. A study has been conducted to investigate tribological performance of the composite on MMW-1 Computer controlled vertical universal friction and wear testing machine. The results show that Al2O3 and Si particles are mainly distributed in the grain boundary and particles are often coated by a thin Sn layer. Friction coefficient of Al2O3/Al-Sn composites is decreased with Sn additions up to 21wt. %.

Influence of Paper Lint on Friction and Wear of Rubber Rollers

2018 ◽  
Author(s):  
Yosuke Tsukiyama ◽  
Isami Nitta
Keyword(s):  
Friction Coefficient ◽  
Friction Force ◽  
Contact Area ◽  
Friction And Wear ◽  
Surface Contamination ◽  
Real Contact Area ◽  
The Real ◽  
Real Contact ◽  
Different Types

This paper deals with the influence of surface contamination on the frictional mechanisms of rubber rollers. The contamination which adhered on the rollers after feeding many sheets of papers is one of the predominant causes of paper jams. However, the mechanism has not been understood. The purpose of this paper is to clarify the relationships between the friction force and the real contact area of papers and contaminated rubber rollers. Carrying out paper feeding tests by using a commercial multifunction peripheral, we tested different types of papers produced by different manufacturers. The tests have been done with combinations of different manufacturer’s papers and different kinds of roller materials. Observations of the real contact area clarified that the roller surfaces covered with paper powders or lint reduces the friction coefficient.

TRIBOLOGICAL PROPERTIES OF SURFACE LAYER WITH BORON IN FRICTION PAIRS

2009 ◽  
Vol 16 (05) ◽  
pp. 767-773 ◽  
Author(s):  
JANUSZ LUBAS
Keyword(s):  
Surface Layer ◽  
Sliding Friction ◽  
Engine Oil ◽  
Frictional Pair ◽  
Surface Layers ◽  
Resistance Level ◽  
Start Up ◽  
Nitrided Surface ◽  
Friction Parameters ◽  
Bearing Alloy

The aim of the present work is to determine the influence of technologically produced boron surface layers on the friction parameters in the sliding pairs under the conditions of mixed friction. The tribological evaluation included ion nitrided, pack borided, laser borided, quenched and tempered surface layers and TiB2 coating deposited on 38CrAlMo5-10 , 46Cr2 and 30MnB4 steels. Modified surface layers of annular samples were matched under test conditions with counter-sample made from AlSn20 bearing alloy. Tested sliding pairs were lubricated with 15 W/40 Lotos mineral engine oil. The tribological tests were conducted on a T-05 block on ring tester. The applied steel surface layer modification with boron allows surface layers to be created with pre-determined tribological characteristics required for the elements of kinematic pairs operating in the conditions of sliding friction. Pack boronizing reduces the friction coefficient during the start-up of the frictional pair and the maximum start-up resistance level is similar to the levels of pairs with nitrided surface layers.

Friction and Wear of Jatropha curcas Oil Using a Four Balls Tester

2014 ◽  
Vol 902 ◽  
pp. 76-81 ◽  
Author(s):  
M. Figueroa ◽  
E. García ◽  
E.A. Gallardo Hernández ◽  
M. Vite-Torres
Keyword(s):  
Renewable Energy ◽  
Friction Coefficient ◽  
Jatropha Curcas ◽  
Friction And Wear ◽  
Engine Oil ◽  
Test Rig ◽  
Friction Coefficients ◽  
Jatropha Curcas Oil ◽  
Oil Mixtures ◽  
Good Potential

Jatropha curcas oil (JCO) is a good option as renewable energy for biodiesel and as lubricant feedstock. In México, the JCO is widely distributed in more than 15 states. This work describes the characterisation of Jatropha curcas oil as additive in engine oil (EO) blended mixtures. The EO and JCO were separately tested using a four balls test rig at 100%. The JCO was added and mixed as an additive to the EO too at 5%-95%, 10%-90%, 15%-85%, 20%-80%, and 50%-50%. The results have shown a steady friction coefficient for the testes carried out at different loads for the different mixtures. The friction coefficients were lower compare to the friction coefficients from the oil engine. Nevertheless, the wear scars were bigger when JCO was used. The results from the oil mixtures showed good potential for the JCO to be used as an additive.

Tribological and Lubrication Properties of Sandblast-Textured Surfaces with Varied Roughness

2010 ◽  
Vol 154-155 ◽  
pp. 1019-1022 ◽  
Author(s):  
Yan Qing Wang ◽  
Hai Feng Yang ◽  
Qing Gong Han ◽  
Liang Fang ◽  
Shi Rong Ge
Keyword(s):  
Friction Coefficient ◽  
Friction And Wear ◽  
Steel Surface ◽  
Hydrodynamic Lubrication ◽  
Testing Machine ◽  
Engine Oil ◽  
Surface Roughening ◽  
Textured Surfaces ◽  
Aisi1045 Steel ◽  
Lubrication Conditions

Surface roughening, with certain roughness topography, is thought to be as an effective tribological method of decreasing friction coefficient of kinematic pairs. Friction and wear of AISI1045 steel surface roughened by convenient and economical way of sandblasting was investigated under lubrication conditions. Roughened and polished samples run against Φ4mm GCr15 pin lubricated by engine oil were tested in reciprocating mode with different load and speed on UMT- testing machine. It is found that there exists the optima surface roughness (Ra is about 3.92μm) roughened by sandblasting in which the least wettability contact angle between engine oil and textured steel surface is obtained, hence the lowest friction coefficient and wear rate is due to the optima hydrodynamic sliding property, although the sliding surface was not in hydrodynamic lubrication state.

Tribological characterization of all-polymer prosthesis based on multi-directional motion

2021 ◽  
pp. 089270572110286
Author(s):  
Xinyue Zhang ◽  
Dekun Zhang ◽  
Kai Chen ◽  
Handong Xu ◽  
Cunao Feng
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Quantitative Relationship ◽  
Motion Path ◽  
Aspect Ratios ◽  
Directional Motion ◽  
Motion Paths ◽  
Prosthesis Material

The complex movement of artificial joints is closely related to the wear mechanism of the prosthesis material, especially for the polymer prosthesis, which is sensitive to motion paths. In this paper, the “soft-soft” all-polymer of XLPE/PEEK are selected to study the influence of motion paths on the friction and wear performance. Based on the periodic characteristics of friction coefficient and wear morphology, this paper reveals the friction and wear mechanism of XLPE/peek under multi-directional motion path, and obtains the quantitative relationship between friction coefficient and the aspect ratios of “∞”-shape motion path, which is of great significance to reveal and analyze the wear mechanism of “soft” all-polymer under multi-directional motion path. The results show that the friction coefficient is affected by the motion paths and have periodicity. Morever, under the multi-directional motion paths, the wear of PEEK are mainly abrasive wear and adhesive wear due to the cross shear effect, while the wear of XLPE is mainly abrasive wear with plastic accumulation. In addition, the friction coefficient is greatly affected the aspect ratios Rs-l of “∞”-shape and loads. Meanwhile, the wear morphologies are greatly affected by the aspect ratios Rs-l of “∞”-shape, but less affected by loads.

scholarly journals Relationship between the real contact behavior and tribological characteristics of cotton fabric

Friction ◽  
2020 ◽  
Author(s):  
Rongxin Chen ◽  
Jiaxin Ye ◽  
Wei Zhang ◽  
Jiang Wei ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Contact Area ◽  
Dynamic Change ◽  
Tribological Characteristics ◽  
Real Contact Area ◽  
Cotton Fibers ◽  
Friction Behavior ◽  
Contact Behavior ◽  
The Real ◽  
Real Contact

Abstract The tribological characteristics of cotton fibers play an important role in engineering and materials science, and real contact behavior is a significant aspect in the friction behavior of cotton fibers. In this study, the tribological characteristics of cotton fibers and their relationship with the real contact behavior are investigated through reciprocating linear tribotesting and real contact analysis. Results show that the friction coefficient decreases with a general increase in load or velocity, and the load and velocity exhibit a co-influence on the friction coefficient. The dynamic change in the real contact area is recorded clearly during the experiments and corresponds to the fluctuations observed in the friction coefficient. Moreover, the friction coefficient is positively correlated with the real contact area based on a quantitative analysis of the evolution of friction behavior and the real contact area at different loads and velocities. This correlation is evident at low velocities and medium load.

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