scholarly journals Effect of Test Parameters on the Friction Behaviour of Anodized Aluminium Alloy

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
M. Guezmil ◽  
W. Bensalah ◽  
A. Khalladi ◽  
K. Elleuch ◽  
M. De-Petris Wery ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Friction Coefficient ◽  
Oxide Layer ◽  
Wear Mechanism ◽  
Optical Emission ◽  
Anodic Oxide ◽  
Tribological Behaviour ◽  
Speed Increase ◽  
Test Parameters ◽  
Pin On Disc

The tribological behaviour of anodic oxide layer formed on Al5754, used in automotive applications, was investigated against test parameters. The friction coefficient under different normal loads, sliding speeds, and oxide thicknesses was studied using a pin on disc tribometer. Results show that the increase of load and sliding speed increase the friction coefficient. The rise of contact pressure and temperature seems to cause changes in wear mechanism. Glow-discharge optical emission spectroscopy (GDOES) was used to investigate the chemical composition of the oxide layer. Morphology and composition of the wear tracks were analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). On the basis of these characterization techniques, a wear mechanism was proposed. The observed mechanical properties can be related to the morphology and the chemical composition of the layer.

Studies Concerning Variation of the Friction Coefficient in Case of Polymeric Composite Materials Reinforced with Carbon Fibers

2013 ◽  
Vol 371 ◽  
pp. 343-347
Author(s):  
Radu Caliman
Keyword(s):  
Friction Coefficient ◽  
Carbon Fiber ◽  
Wear Rate ◽  
Carbon Fibers ◽  
Polymeric Composite ◽  
Tribological Behaviour ◽  
Fiber Concentration ◽  
Rotating Speed ◽  
Mechanical And Tribological Properties ◽  
Pin On Disc

Thanks to their low density, good thermal, mechanical and tribological properties, composites made of carbon fibres and epoxy are particularly adapted to the manufacturing of aircraft brake discs. Several methods have been developed to improve their performance. The purpose of the present study was to evaluate the influence of different epoxy/carbon fibers ratio enhance modification on the friction behaviour and to identify the related mechanisms. Nine different hybrid matrix composites were elaborated. These samples were submitted to structural and mechanical characterization, then to friction and wear tests using a pin-on-disc tribometer, at ambient temperature and humidity, constant rotating speed, varying the loading pressure. As the content of carbon fiber increased, the wear rate of the composites trended to increase. Under the friction condition of high applied load, the friction coefficient inclined to decrease while wear rate increased. When slided under a relatively high load of 12 daN, the wear resistance behaved was better as the content of carbon fiber increased. The aim of the present study was to understand the friction mechanisms of these composites, dealing with the effects of varying the carbon fiber concentration within the matrix, not only on the tribological behaviour but also on the superficial mechanical properties.

scholarly journals Tribological Behaviour of Stellite Matrix Composites for High Temperatures Applications

2012 ◽  
Vol 498 ◽  
pp. 89-101 ◽  
Author(s):  
Karl Delbé ◽  
Solisabel Orozco Gomez ◽  
Juan Manuel Carrillo Mancuso ◽  
Jean Yves Paris ◽  
Jean Denape
Keyword(s):  
Normal Load ◽  
Solid Lubricants ◽  
Operating Conditions ◽  
Matrix Composites ◽  
Tribological Behaviour ◽  
Plasma Sintering ◽  
Test Parameters ◽  
Pin On Disc ◽  
Spark Plasma ◽  
Innovative Materials

Extreme working conditions affect material used as friction components in transportation field: they rapidly reach their limits and critical parts require to be regularly replaced. Alternative solutions withstanding higher operating conditions imply to find innovative materials. Stellite matrix composites including various solid lubricants, WS2 and h-BN, able to admitextreme conditions were developed using a Spark Plasma Sintering technique, which makes possible the formation of new microstructures out of reach by conventional means. Sliding tests were conducted using a pin-on-disc tribometer in air at 450°C, with a velocity of 0,25 m/s and various normal load ranged from 2.5 to 40 N. Influence of solid lubricant content and sensitivity to test parameters were studied in terms of friction and wear responses of the contacting materials. Friction properties are equivalent to Stellite ones and sometimes lesseffective. A reduction of wear is quantified for many composites, and the best behavior is observed for those that contain WS2. In agreement with the third body approach, interpretations are proposed to describe the interphase dynamics within the contact.

Anodic Oxide Layer Formation on A357 Aluminium Alloy Produced by Thixocasting

2006 ◽  
Vol 116-117 ◽  
pp. 80-83 ◽  
Author(s):  
Antonio Forn ◽  
Josep A. Picas ◽  
Maite T. Baile ◽  
Sergi Menargues ◽  
V.G. García
Keyword(s):  
Aluminium Alloy ◽  
Oxide Layer ◽  
Friction And Wear ◽  
Film Formation ◽  
Anodic Oxide ◽  
Layer Formation ◽  
Wear Properties ◽  
Pin On Disc ◽  
Anodic Oxide Layer ◽  
Friction And Wear Properties

Anodizing is widely used in the surface treatment of aluminium alloys in order to preserve the integrity of the alloy surface, to minimize the need for maintenance and repair, and to maximize the component life. The aim of this work is to study the influence heat treatments (T5 and T6) have on the anodization of A357 aluminium alloy produced by a Thixocasting process. In particular the effect of shape, size and distribution of silicon and intermetallic phases on the anodic oxide film formation. SEM and EDS analyses were used to examine the microstructural features found on, within and under the anodic oxide layer. Experiments using a tribometer (pin-on-disc tests) were performed in order to evaluate the friction and wear properties of the different layers.

Study on Fretting Wear Behavior of 40CrNiMoA Steel

2010 ◽  
Vol 139-141 ◽  
pp. 447-451
Author(s):  
Zhu Jun Li
Keyword(s):  
Friction Coefficient ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Wear Behavior ◽  
Experimental Results ◽  
Fretting Wear ◽  
Wear Volume ◽  
Volume Increase ◽  
Test Parameters ◽  
Adhesion Wear

This study deals with fretting wear behavior of 40CrNiMoA steel on a SRVⅣoscillating friction and wear tester. The results indicate that with the frequency and load increasing, both the friction coefficient and fretting wear volume increase. With the amplitude increasing, the fretting wear volume increased too, but the effect of amplitude on friction coefficient was not simple positive correlation according to the experimental results. Meanwhile, the fretting wear mechanism is directly related to test frequency, load and amplitude. When they are small, the main fretting wear mechanism is abrasive wear, with these test parameters increasing, the main fretting wear mechanism turns to a combination of abrasive wear and adhesion wear. Based on the experimental results, the anti-fretting wear measures of steel worm gear pairs used in mechanical tracked regulator of tracked vehicle are discussed.

scholarly journals Study on the High Temperature Friction and Wear Behaviors of Cu-Based Friction Pairs in Wet Clutches by Pin-on-Disc Tests

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Er-Hui Zhao ◽  
Biao Ma ◽  
He-Yan Li
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Adhesive Wear ◽  
Wear Factor ◽  
High Temperature Wear ◽  
Delamination Wear ◽  
Different Temperatures ◽  
Pin On Disc

This work is devoted to the study of the high temperature friction and wear behaviors of Cu-based friction pairs in wet clutches under different temperatures, rotation speeds, and loads. Pin-on-disc tests are carried out on the UMT-3. The friction coefficient, wear factor, and high temperature wear mechanism are primarily analyzed. The results show that as the temperature rises from 120°C to 420°C, the friction coefficient increases from 0.28 to 0.35 at first and then decreases to 0.30, when the vibration of friction coefficient is significantly identified. Meanwhile, the wear factor grows gradually from K=7.9×10-8 g/Nm to K=41.8×10-8 g/Nm at first and then grows sharply to K=112.2×10-8 g/Nm. The main wear mechanisms are abrasive wear and ploughing wear when the temperature is below 345°C, and the wear seriously deteriorates when the temperature exceeds 345°C, when the wear mechanism changes to adhesive wear and delamination wear.

scholarly journals Influence of Dry Friction on the Wear Behavior of X52 Steel -Experimental Study and Simulation Using Response Surfaces Method

2021 ◽  
Author(s):  
Soumaya Meddah ◽  
Mounira Bourebia ◽  
Kaddour Gherfi ◽  
Laouar Lakhdar ◽  
Amel Oulabbas ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Wear Mechanism ◽  
Wear Behavior ◽  
Response Surfaces ◽  
Surface Method ◽  
Test Parameters ◽  
X52 Steel ◽  
Worn Surface ◽  
Influential Parameters

Abstract The objective of this work is to identify the most influential parameters on the friction coefficient and wear rate, using the response surface method. The friction tests were carried out by adopting the methodology of complete planes 23at three factors ("D", "V" et "Py"), at two level for each factor. The results show a decrease in the wear rate when the three factors are at their highest level and a decrease in the friction coefficient when using minimum loads and speeds on important distances. In addition, the developed mathematical models make it possible to reveal a correlation between the test parameters and the responses studied in their studied domain. An evaluation of the volume parameters "Vmc" and "Vvv" was carried out. The morphology of the worn surface shows that the friction under a load of 1 N leads to the predominance of an abrasive wear mechanism, while a load of 10 N favors an adhesive wear mechanism, increasing the parameters "Vmc" and "Vvv" to the maximum.

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 The Impact of Heat Treatment on the Behavior of a Hot-Dip Zinc Coating Applied to Steel During Dry Friction

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 660
Author(s):  
Dariusz Jędrzejczyk ◽  
Elżbieta Szatkowska
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Friction Coefficient ◽  
Dry Friction ◽  
Zinc Coating ◽  
Pin On Disc ◽  
The One ◽  
The Impact ◽  
Coating Hardness ◽  
Anticorrosion Properties

The analyzed topic refers to the wear resistance and friction coefficient changes resulting from heat treatment (HT) of a hot-dip zinc coating deposited on steel. The aim of research was to evaluate the coating behavior during dry friction after HT as a result of microstructure changes and increase the coating hardness. The HT parameters should be determined by taking into consideration, on the one hand, coating wear resistance and, on the other hand, its anticorrosion properties. A hot-dip zinc coating was deposited in industrial conditions (according EN ISO 10684) on disc-shaped samples and the chosen bolts. The achieved results were assessed on the basis of tribological tests (T11 pin-on-disc tester, Schatz®Analyse device, Sindelfingen, Germany), microscopic observations (with the use of optical and scanning microscopy), EDS (point and linear) analysis, and microhardness measurements. It is proved that properly applied HT of a hot-dip zinc coating results in changes in the coating’s microstructure, hardness, friction coefficient, and wear resistance.

scholarly journals Seasonal variations in PM10 inorganic composition in the Andean city

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Rasa Zalakeviciute ◽  
Katiuska Alexandrino ◽  
Yves Rybarczyk ◽  
Alexis Debut ◽  
Karla Vizuete ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Inductively Coupled Plasma ◽  
Chemical Elements ◽  
Large Fraction ◽  
Urban Pollution ◽  
Optical Emission ◽  
High Elevation ◽  
Water Soluble ◽  
Wet Season ◽  
Soluble Ions

Abstract Particulate matter (PM) is one of the key pollutants causing health risks worldwide. While the preoccupation for increased concentrations of these particles mainly depends on their sources and thus chemical composition, some regions are yet not well investigated. In this work the composition of chemical elements of atmospheric PM10 (particles with aerodynamic diameters ≤ 10 µm), collected at the urban and suburban sites in high elevation tropical city, were chemically analysed during the dry and wet seasons of 2017–2018. A large fraction (~ 68%) of PM10 composition in Quito, Ecuador is accounted for by water-soluble ions and 16 elements analysed using UV/VIS spectrophotometer and Inductively Coupled Plasma—Optical Emission Spectroscopy (ICP-OES). Hierarchical clustering analysis was performed to study a correlation between the chemical composition of urban pollution and meteorological parameters. The suburban area displays an increase in PM10 concentrations and natural elemental markers during the dry (increased wind intensity, resuspension of soil dust) season. Meanwhile, densely urbanized area shows increased total PM10 concentrations and anthropogenic elemental markers during the wet season, which may point to the worsened combustion and traffic conditions. This might indicate the prevalence of cardiovascular and respiratory problems in motorized areas of the cities in the developing world.

Mechanical Behaviour of CoCrMo Alloy with Si Content

2015 ◽  
Vol 754-755 ◽  
pp. 1017-1022 ◽  
Author(s):  
Petrică Vizureanu ◽  
Mirabela Georgiana Minciună ◽  
Dragoş Cristian Achiţei ◽  
Andrei Victor Sandu ◽  
Kamarudin Hussin
Keyword(s):  
Tensile Strength ◽  
Chemical Composition ◽  
Testing Machine ◽  
Base Material ◽  
Optical Emission ◽  
Experimental Tests ◽  
Optical Emission Spectrometry ◽  
Emission Spectrometry ◽  
Standard Samples

.The paper present aspects about the obtaining of non-precious dental alloys (type CoCrMo and CoCrMoSi7), the determination of chemical composition by optical emission spectrometry and the experimental tests for determining the tensile strength, made on standard plate samples. The base material used in experiments was a commercial alloy, from CoCrMo system, which belongs to the class of dental non-precious alloys, intended to medical applications. The obtaining of studied alloy was made on arc re-melting installation, under vacuum, type MRF ABJ 900. The process followed to realize a rapid melting, with a maximum admissible current intensity. The samples for tests were obtained by casting in an electric arc furnace, under vacuum, in optimal conditions for melting and solidification and processing by electro-erosion, to eliminate all the disturbing factors which come by processing conditions for the samples. The determination of chemical composition for cobalt based alloys, by optical emission spectrometry, was made on SpectromaxX equipment with spark. The electrical discharge is made with the elimination of an energy quantity, fact which determine plasma forming and light issue. Tensile tests for standard samples, made from cobalt based alloy, was made on Instron 3382 testing machine, and assisted by computer. The obtained results are: elongation, elasticity modulus, tensile strength and offer complete information about the analyzed mechanical properties. For the certitude of obtained experimental results, the tests were made on samples with specific dimensions according ISO 6892-1:2009(E) standard, both for the tensile strength, and also machine operation.

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