scholarly journals Wear Properties of Sc-Bearing Zr-Based Composite BMG with Nano-CuZr2 under Lubrication

2020 ◽  
Vol 10 (14) ◽  
pp. 4909
Author(s):  
Shing-Hoa Wang ◽  
Chau-Chang Chou ◽  
Hsien-Hung Chung ◽  
Rong-Tan Huang ◽  
Horng-Yi Chang ◽  
...  
Keyword(s):  
Wear Rate ◽  
Wear Test ◽  
Surface Friction ◽  
Sample Surface ◽  
Optical Microscope ◽  
Wear Properties ◽  
Friction Coefficients ◽  
Adhesion Wear ◽  
Pin On Disk ◽  
New Phase

Lubricated sliding wear of amorphous (Zr55Cu30Ni10Al5)99.98Sc0.02/CuZr2 nanocrystal composite bulk metallic glasses (BMG) under various sliding velocities with a load of 20 N was investigated using the pin-on-disk test. After the wear test involving oil lubrication was performed, there was no wear induced new-phase transformation in the sample surface. Friction coefficients were within the range from 0.22 to approximately 0.29 under a 20-N load at different sliding velocities. Therefore, the calculated friction coefficients clearly indicated that the adhesion wear dominated from the experimental results. This deformation behavior resulted in a higher wear rate and wear coefficient. In addition, worn surfaces were characterized and examined under a scanning electron microscope (SEM) and optical microscope. The mechanism of high wear rate was clarified.

Al-4.5 Cu-3.8 Fe In Situ Composites: Effect of Rolling on Microstructure and Wear Properties

2011 ◽  
Vol 264-265 ◽  
pp. 1939-1943 ◽  
Author(s):  
S.K. Shaha ◽  
A.S.W. Kurny ◽  
Mahbub Hasan ◽  
S. Dyuti
Keyword(s):  
Wear Rate ◽  
Solidification Process ◽  
Hardness Measurement ◽  
Optical Microscope ◽  
Wear Testing ◽  
Wear Properties ◽  
In Situ Composites ◽  
Pin On Disk ◽  
Hot Rolled

Al based MMCs have attracted a lot of attention particularly for their desirable combination of high stiffness and low specific gravity. In the present study, Al-4.5Cu-3.8Fe in-situ composites were manufactured by using solidification process. During solidification Al-Fe intermetallic was formed in a matrix of Al-Cu alloy. The composite was hot rolled at different degree using a two high rolling mill. Subsequently the composites were characterized by SEM, XRD, hardness measurement and wear testing. Wear testing was conducted on a pin-on-disk machine by applying 10 KN load. After the wear tests, the worn surfaces of the composite specimens were examined under an optical microscope. According to experimental results, as cast in-situ composites exhibited the highest wear rate. The hardness increased and wear rate decreased with the extent of rolling. The presence of reinforcing Al3Fe phase and fragmentation of those particles during hot rolling are suggested to contribute to the better wear resistance of the composites. The extent of abrasive wear was largest in the case of as cast composites, as evidenced by deep grooves on the worn surface and highest weight loss.

Wear Properties of Metal Matrix Composite Al-Cu and Al-Cu-TiB2

2015 ◽  
Vol 819 ◽  
pp. 268-273 ◽  
Author(s):  
Ramli Rosmamuhamadani ◽  
Shamsuddin Sulaiman ◽  
Mohd Idris Shah Ismail ◽  
Mohamed Arif Azmah Hanim ◽  
Mahesh Talari
Keyword(s):  
Wear Rate ◽  
Metal Matrix ◽  
Wear Behavior ◽  
Optical Microscope ◽  
Constant Load ◽  
Matrix Composites ◽  
Wear Properties ◽  
Casting Technique ◽  
Cu Alloy

Tensile and wear properties of aluminium (Al) based metal matrix composites (MMCs) was prepared by added titanium diboride (TiB2) with in-situ technique by salt route. The salts used in this research were potassium hexafluorotitanate (K2TiF6) and potassium tetrafluoroborate (KBF4). Nanocomposite samples were prepared by casting technique associated with incorporating 3 and 6 wt.% of TiB2 into matrix of Al-6wt.%Cu. Instron and wear tests machine were used to characterize the tensile and wear Al-Cu alloys properties. Results showed that increase in TiB2 content gave the high properties of tensile and wear behavior. The study indicates that TiB2 particles have giving improvement the wear performance of the Al–6wt.%Cu alloy. For a constant load and sliding speed, the wear rate decreases as a function of amount of TiB2 in the composite. The wear rate decrease with increasing in wt.% TiB2 particles for the all loads applied. However, addition of TiB2 particle to the Al–6 wt%.Cu matrix has show the coefficient value of wear decreases regardless of applied load. Study of the wear surfaces both alloy and composites by optical microscope suggests that the improvement in wear resistance is mainly due to the formation of finer groove or debris by content of TiB2.

Friction and wear properties of poly(ether sulfone) containing perfluorocarbon end group

2017 ◽  
Vol 30 (2) ◽  
pp. 247-253 ◽  
Author(s):  
Ye Zhu ◽  
Yingshuang Shang ◽  
Haibo Zhang ◽  
Lianjun Ding ◽  
Yunping Zhao ◽  
...  
Keyword(s):  
Wear Rate ◽  
Photoelectron Spectroscopy ◽  
Tribological Property ◽  
Friction And Wear ◽  
Performance Enhancement ◽  
Wear Test ◽  
Material Surface ◽  
Wear Property ◽  
Wear Properties ◽  
Worn Surface

Poly(ether sulfone) (PES) with high coefficient of friction (COF) and wear rate needs treatment to enhance its tribological property in engineering plastic area. Here, the low surface energy of perfluorocarbon chains terminated poly (ether sulfone) (PES-F) had been used to improve the tribological property of such self-lubricating materials. In this research, the performance enhancement due to the existence of perfluorocarbon group on the material surface was discussed on improvement of anti-friction and wear resistance. On the premise of mechanical strength guarantee, the variation regularity of COF and volume wear rate of PES-F were quantitatively analyzed through the pin-on-disc wear test apparatus, combined with X-ray photoelectron spectroscopy analysis. It was found that PES-F exhibited the best tribological property during the initial phases of friction test, attributing to the highest content of F on the material surface. Observation of PES-F worn surface and wear debris revealed that the COF and wear rate of modified PES were decreased not only due to the effect of perfluorocarbon group but also by the change of worn surface morphology, both of which were the main reasons for anti-friction and anti-wear property enhancement.

scholarly journals Microstructure and Properties of h-BN-Reinforced Titanium Alloy Matrix Composite Fabricated with Optimized Spark Plasma Sintering Parameters

2021 ◽  
Author(s):  
John Olorunfemi Abe ◽  
Olawale Popoola ◽  
Patricia Popoola ◽  
Emmanuel Ajenifuja
Keyword(s):  
Wear Rate ◽  
Heating Rate ◽  
Spark Plasma Sintering ◽  
Optical Microscope ◽  
Holding Time ◽  
Solid Matrix ◽  
Wear Properties ◽  
Alloy Matrix ◽  
Plasma Sintering ◽  
Spark Plasma

Abstract The effects of different combinations of spark plasma sintering parameters: temperature, pressure, heating rate and holding time, at three levels on the microstructure, densification, mechanical and wear properties of Ti6Al4V/h-BN binary composite were considered in this work. The design method of Taguchi and signal-to-noise (S/N) ratios analysis and main effects of the parameters were employed to randomize and optimize the levels of the SPS parameters. The microstructure and phase features of the samples sintered were analyzed by using a scanning electron microscope, an optical microscope and X-ray diffractometer respectively. Archimedes’ method, Vickers microhardness tester and a tribometer were used to evaluate the densification, microhardness and wear profiles of the samples. The most important parameter levels for optimum quality characteristics of the sintered composite were obtained at temperature, pressure, heating rate and holding time of 1000 °C, 30 MPa, 100 °C/min and 10 min, respectively. Ti6Al4V/h-BN composite approaching complete theoretical densification of 99.54%, microhardness value of 7.03 GPa, 1.66 GPa yield strength, 2.29 GPa ultimate tensile strength and wear rate of 8.075 x 10-6 mm3/Nm, respectively was produced with the optimized process parameters. The microhardness improved by approximately 216% and the wear rate improved by 97.8% of the Ti6Al4V alloy matrix. The improved microstructure, higher densification, mechanical and wear properties of the optimized composite were promoted by high sintering temperature and low heating rate which ensured adequate diffusional mass transport, achievement of refined grains, better pore filling and formation of solid matrix-reinforcement interfacial integrity.

scholarly journals Study on Friction and Wear Properties of Pantograph Strip/Copper Contact Wire for High-Speed Train

2014 ◽  
Vol 8 (1) ◽  
pp. 125-128 ◽  
Author(s):  
Tao Ding ◽  
Wenjing Xuan ◽  
Qiudong He ◽  
Hao Wu ◽  
Wei Xiong
Keyword(s):  
Wear Rate ◽  
Electric Current ◽  
High Speed ◽  
Friction And Wear ◽  
Optical Microscope ◽  
Wear Properties ◽  
Contact Wire ◽  
Arc Erosion ◽  
The Coefficient Of Friction ◽  
Friction And Wear Properties

A series of experiments on friction and wear properties of carbon strip rubbing against copper contact wire is performed on high-speed friction and wear tester with electric current. The results show that the friction coefficient is generally maintained between 0.24 and 0.37. In the absence of electric current, the coefficient of friction is higher than that in the presence of electric current. The wear rate of carbon strip materials is generally not more than 0.014g/km. In particular, the wear rate under the electric current of 240 A is 14 times more than that in the absence of electric current. By observing the scar of worn surface with optical microscope, it can be found that there are obvious slip scars and arc erosive pits. The dominated wear mechanisms are abrasive wear and arc erosion in electrical sliding frictional process.

scholarly journals Nanocomposite Kaolin/TiO2 as a Possible Functional Filler in Automotive Brake Pads

2018 ◽  
Vol 2018 ◽  
pp. 1-14
Author(s):  
Kateřina Dědková ◽  
Marcus Morbach ◽  
Jakub Výravský ◽  
Kateřina Mamulová Kutláková ◽  
Kristina Čabanová ◽  
...  
Keyword(s):  
Wear Rate ◽  
Microscopic Analysis ◽  
Wear Test ◽  
Particulate Emissions ◽  
Brake Pad ◽  
Wear Properties ◽  
Brake Pads ◽  
Operation Conditions ◽  
Friction Performance ◽  
Friction Brake

An automotive friction brake pad is a complex system consisting of several components with unique and balanced properties related to operation conditions. There are efforts to develop brake pads with longer lifetime and better friction performance and wear properties. Those properties are related to composition of the pads, and therefore, new materials are being evolved. Tuning the friction and wear properties can be achieved with the selection of a functional filler and optimizing its amount in a formulation of friction brake pad. Laboratory-developed and laboratory-prepared nanocomposite material kaolin/TiO2 (KATI) has been introduced to formulation of the commercially available automotive low-steel brake pad. Kaolin was utilized as a matrix for anchoring TiO2 nanoparticles. New unused pads and pads after AK master, a standard dynamometer testing procedure of friction performance, were investigated using light and scanning electron microscopy providing information on the structure and its changes after the friction processes. Moreover, MTK wear test was used to compare wear rate of the newly developed pad with the reference low-steel pad. Improved durability of the brake pad formulation has been observed together with sufficient friction performance. Microscopic analysis shown homogenous distribution of the KATI nanocomposite in the friction layer. From the obtained results, it can be assumed that the new formulation is promising regarding to the life cycle of the pads and reduction of wear rate and thus potential production of wear particulate emissions.

The Effect of Motion Path on the Wear Rate of UHMWPE for Orthopaedic Implants

1999 ◽  
Author(s):  
Jeff A. Sprague ◽  
Willard L. Sauer
Keyword(s):  
Wear Rate ◽  
Wear Test ◽  
Axial Rotation ◽  
Wear Testing ◽  
Motion Path ◽  
Orthopaedic Implant ◽  
Wear Rates ◽  
Nonlinear Motion ◽  
Pin On Disk

Abstract The effect of adding a second axis of motion was investigated for pin-on-disk wear testing of ultra-high-molecular-weight polyethylene (UHMWPE) for orthopaedic implant applications. In addition to linear reciprocation of the UHMWPE or metal disk, axial rotation of the metal or UHMWPE pin was conducted. The added rotation reproduces the cross-shear on the UHMWPE surface that is generated in clinically relevant wear simulator tests and in vivo. The wear rates that result from the multi-axis pin-on-disk tests are significantly higher (one to two orders of magnitude) than those seen in the linear-only tests. This supports the findings of other researchers (Bragdon et al., 1996; McKellop, 1995; Walker et al., 1996; Wang et al. 1997) in that the application of nonlinear motion increases the wear of UHMWPE substantially. This is further validated by the comparison of a hip simulator wear test conducted with three axes of motion — rotation, flexion, and abduction — to a test conducted with two axes of motion — rotation and flexion. The absence of the abduction eliminated a significant degree of nonlinear motion (cross-shear) and, consequently, the wear rate was significantly lower than that seen in the test with abduction.

Fabrication of Cu Surface Composite Reinforced by Ni Particles Via Friction Stir Processing: Microstructure and Tribology Behaviors

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Mohsen Pezeshkian ◽  
Iman Ebrahimzadeh ◽  
Farhad Gharavi
Keyword(s):  
Friction Stir Processing ◽  
Traverse Speed ◽  
Optical Microscope ◽  
Wear Properties ◽  
Friction Stir ◽  
Surface Composite ◽  
Hardness Tester ◽  
Different Dimensions ◽  
Pin On Disk ◽  
Tool Rotation

In the present investigation, friction stir processing (FSP) was used to integrate Ni particles into the surface of copper in order to fabricate a surface composite. Determining an optimized percentage of Ni particles, different dimensions of grooves were machined into the Cu plates. Then, the specimens' grooves were filled by nickel reinforcement particles, and friction stir process was performed on the specimens with tool rotation speed of 800 rpm and traverse speed of 50 mm/min. Optical microscope (OM) and scanning electron microscope (SEM) were used to evaluate the microstructure. Pin-on-disk test was performed to evaluate wear properties using pins manufactured from the FSPed zone. Also, Micromet-Buehler Vickers hardness tester was used to test the FSPed surfaces' microhardness. The results show that the best properties are obtained when using 2 × 2 mm groove. In this situation, microhardness and wear properties were improved as 40% and 60% compared to the substrate, respectively.

Effects of Different Load with Vary Lubricant on the Friction Coefficient and Wear Rate Using Pin on Disk Tribometer

2016 ◽  
Vol 819 ◽  
pp. 495-498 ◽  
Author(s):  
Samion Syahrullail ◽  
Norawzi Nuraliza
Keyword(s):  
Wear Rate ◽  
High Speed ◽  
Palm Olein ◽  
Surface Damage ◽  
Wear Scar ◽  
Friction Reduction ◽  
Wear Properties ◽  
Wear Scar Diameter ◽  
Pin On Disk ◽  
The Impact

A study has been created on the wear rate and friction constant for various material under the impact of load and material where the equipment pin on disk has been used to investigate the specification on the wear and constant of friction (COF) theory. The issues occur because of the metal-to-metal contact once interaction between two surfaces creates friction, wear and heat. It’ll cause every element life shortened, economically wasted, surface damage and cracks. This paper evaluates via pin on disc tribometer using SKD II and aluminum alloy, A 5083 as work pieces material. The test was tested using different type of lubricant (palm olein and mineral based oil) with different load. The result shows palm olein is more than mineral-based oil for constant friction as sliding speed increased and wear scar diameter lubricated with palm olein lower at low and high speed compared to the oil. As a conclusion, palm olein has better performance properties in terms of friction reduction (coefficient of friction) and wear resistance (anti-wear properties) at low and high speed. Pin that lubricated with palm olein showed small wear scar diameter compared to the mineral based oil. Therefore, palm olein has risk to use as a lubricant of mating components.

The Effect of Lubricant Chemistry on Wear and Scuffing of Coated Surfaces

2003 ◽  
Author(s):  
K. Cheenkachorn ◽  
J. M. Perez ◽  
O. O. Ajayi ◽  
G. R. Fenske
Keyword(s):  
Sunflower Oil ◽  
Corn Oil ◽  
Wear Test ◽  
Severity Index ◽  
Optical Microscope ◽  
Wear Properties ◽  
High Oleic Sunflower Oil ◽  
Base Oil ◽  
High Oleic ◽  
Coated Surfaces

This study focuses on the effect of lubricant chemistry on wear and scuffing of coated surfaces. The coated surfaces in the present work include TiAlN, TiN, and CrN in the presence of different lubricants including high-oleic sunflower oil, high-oleic corn oil, fully-formulated sunflower oil, fully-formulated corn oil, and a synthetic base oil. The tests are conducted using the four-ball wear test to study the wear and scuffing properties. The scanning electron microscope (SEM) and optical microscope with MicroXAMR are used to study the wear mechanism. The study shows that coatings do not affect the friction coefficient at severe test conditions. However, some coatings, TiN and CrN, improve the wear properties even in base fluids without additives. All coatings improve the scuffing properties and increase the contact severity index. The vegetable-based lubricants perform comparably to commercially available synthetic lubricants.

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