Comparative study of the wear behavior of B4C monolayered and CrN/CrCN/DLC multilayered PVD coatings under high contact loads: an experimental analysis

2021 ◽  
pp. 1-42
Author(s):  
Francisco J. G. Silva ◽  
Rafaela Casais ◽  
António Baptista ◽  
Maria José Marques ◽  
Vitor Sousa ◽  
...  
Keyword(s):  
Contact Pressure ◽  
Wear Behavior ◽  
Layer Structure ◽  
Wear Testing ◽  
Pvd Coatings ◽  
Laboratory Equipment ◽  
Pin On Disc ◽  
Coated Surfaces ◽  
Almost All ◽  
Wear Tests

Abstract There are several ways to characterize the wear resistance of coatings in the laboratory, almost all of them applying relatively low contact pressure, both punctually and over surface contact. Pin-on-disc, reciprocal sliding and micro-abrasion wear tests are quite common configurations for this purpose. Thus, a gap was identified in terms of characterization of hard PVD coatings subject to higher levels of contact pressure. This work aims to study and compare the wear behavior of two different coatings made by PVD, a B4C (Boron Carbide) monolayer, less used, and another following a multi-layer structure of CrN/CrCN/DLC, to identify the wear mechanisms involved in quite different coatings. Both coatings were initially characterized in terms of chemical composition, thickness, morphology, structure, hardness, and adhesion to the substrate, being subsequently tested in laboratory equipment for wear tests following the block-on-ring configuration and relatively high levels of contact pressure, with a view to study the failure mechanisms of the coatings and their wear rate. CrN/CrCN/DLC multilayered coatings presented a better overall wear behavior, whereas B4C coating showed a good wear behavior regarding the load and configuration used, but in line with the behavior already observed when other wear testing configurations had been used. Thus, under the conditions imposed, CrN/CrCN/DLC coatings is the best option when high contact pressure is applied to the coated surfaces.

Influence of Grain Orientation on Friction and Wear Behavior in Quasicrystalline Alloys

2000 ◽  
Vol 643 ◽  
Author(s):  
Alan Duckham ◽  
Dan Shechtman ◽  
Benjamin Grushko
Keyword(s):  
Grain Orientation ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Icosahedral Phase ◽  
Friction And Wear Behavior ◽  
Decagonal Phase ◽  
Pin On Disc ◽  
Alnico Alloy ◽  
Electron Back Scattered Diffraction ◽  
Wear Tests

AbstractThe influence of grain orientation on the friction and wear behavior of single-phase quasicrystalline alloys is investigated. Pin-on-disc wear tests and friction coefficient measurements have been performed on bulk samples of icosahedral phase AlPdMn and decagonal phase AlNiCo alloys. Wear behavior has been evaluated by optical microscopy, scanning electron microscopy (SEM) and electron back-scattered diffraction (EBSD). Coefficient of friction values of the decagonal AlNiCo alloy are found to be widely scattered (between 0.03 and 0.55) compared to the far more consistent values of the icosahedral alloys. This is explained by considering the significant variation in wear behavior that is observed between different – sometimes adjacent – oriented grains in the decagonal specimens.

scholarly journals Phytoliths can cause tooth wear

2020 ◽  
Vol 17 (172) ◽  
pp. 20200613
Author(s):  
Fernando Rodriguez-Rojas ◽  
Oscar Borrero-Lopez ◽  
Paul J. Constantino ◽  
Amanda G. Henry ◽  
Brian R. Lawn
Keyword(s):  
Sliding Wear ◽  
Animal Species ◽  
Artificial Saliva ◽  
Wear Test ◽  
Tooth Wear ◽  
Wear Testing ◽  
Third Body ◽  
Pin On Disc ◽  
Molar Teeth ◽  
Wear Tests

Comparative laboratory sliding wear tests on extracted human molar teeth in artificial saliva with third-body particulates demonstrate that phytoliths can be as effective as silica grit in the abrasion of enamel. A pin-on-disc wear testing configuration is employed, with an extracted molar cusp as a pin on a hard disc antagonist, under loading conditions representative of normal chewing forces. Concentrations and sizes of phytoliths in the wear test media match those of silica particles. Cusp geometries and ensuing abrasion volumes are measured by digital profilometry. The wear data are considered in relation to a debate by evolutionary biologists concerning the relative capacities of intrinsic mineral bodies within plant tissue and exogenous grit in the atmosphere to act as agents of tooth wear in various animal species.

Abrasive Wear Performance of Aluminium Modified Epoxy-Glass Fiber Composites

2015 ◽  
Vol 03 (03n04) ◽  
pp. 1550005 ◽  
Author(s):  
Vikram G. Kamble ◽  
Punyapriya Mishra ◽  
Hassan A. Al Dabbas ◽  
H. S. Panda ◽  
Johnathan Bruce Fernandez
Keyword(s):  
Abrasive Wear ◽  
Glass Fiber ◽  
Wear Behavior ◽  
Fiber Composite ◽  
Matrix Material ◽  
Testing Machine ◽  
Wear Testing ◽  
Aluminum Particles ◽  
Pin On Disc ◽  
Modified Epoxy

For a long time, Aluminum filled epoxies molds have been used in rapid tooling process. These molds are very economical when applied in manufacturing of low volume of plastic parts. To improve the thermal conductivity of the material, the metallic filler material is added to it and the glass fiber improves the wear resistance of the material. These two important parameters establish the life of composites. The present work reports on abrasive wear behavior of Aluminum modified epoxy and glass fiber composite with 5 wt.% and 10 wt.% of aluminum particles. Through pin on disc wear testing machine, we studied the wear behaviors of composites, and all these samples were fabricated by using hand layup process. Epoxy resin was used as matrix material which was reinforced with Glass fiber and Aluminum as filler. The composite with 5 wt.% and 10 wt.% of Al was cast with dimensions 100 × 100 × 6 mm. The specimens were machined to a size of 6 × 6 × 4 mm for abrasive testing. Abrasive tests were carried out for different grit paper sizes, i.e., 150, 320, 600 at different sliding distance, i.e., 20, 40, 60 m at different loads of 5, 10 and 15 N and at constant speed. The weight loss due to wear was calculated along with coefficient of friction. Hardness was found using Rockwell hardness machine. The SEM morphology of the worn out surface wear was analyzed to understand the wear mechanism. Results showed that the addition of Aluminum particles was beneficial for low abrasive conditions.

The Effects of Applied Load on Wear Behavior of Al-Quarry Dust Particle Composite Disc Sliding against Automobile Brake Material

2014 ◽  
Vol 592-594 ◽  
pp. 1357-1361 ◽  
Author(s):  
M. Ramesh ◽  
T. Karthikeyan ◽  
A. Kumaravel ◽  
C. Kumaari
Keyword(s):  
Wear Rate ◽  
Applied Load ◽  
Wear Behavior ◽  
Dust Particles ◽  
Dry Sliding Wear ◽  
Sem Image ◽  
Pin On Disc ◽  
Sliding Distance ◽  
Wear Tests ◽  
Quarry Dust

The wear behavior of aluminium alloy (A356) reinforced with 5 wt. % of quarry dust particles composite disc was sliding against automobile brake friction lining pin was investigated. Dry sliding wear studies were investigated in pin-on-disc apparatus. The wear tests were carried out range of applied load 20 to 60 N and constant sliding velocity (0.5 m/s) under sliding distance of 500 m. The wear behavior of aluminium metal matrix composite (AMC) has been compared with the commercially used 25 grade Gray Cast Iron disc (GCI).The results showed that the wear rate of AMC disc decreased with increasing the applied load. However the wear rate of AMC disc with respective pin decreased with increasing the applied load. The coefficient friction increased with increasing the applied load. The scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDAX) used to investigate the disc and pin. The wear debris was analyzed by SEM image.

Coupled Evolution of Load Distribution and Wear on Lead Screw Threads

2005 ◽  
Author(s):  
Thierry A. Blanchet
Keyword(s):  
Contact Pressure ◽  
Load Distribution ◽  
Wear Testing ◽  
Lead Screw ◽  
Threaded Fasteners ◽  
Uniform Steady State ◽  
Screw Threads ◽  
Contact Pressures ◽  
Lower Contact ◽  
Wear Tests

To prescribe simulative contact pressures in benchtop wear tests on materials and lubricants for threads of lead screws, it is necessary to understand how applied load is distributed over those threads. While in threaded fasteners it is known that the first engaged nut thread carries the greatest load and experiences the highest contact pressure, in a lead screw application with considerable sliding this most heavily nut thread will correspondingly wear most rapidly. This suggests instead an eventually uniform steady-state load distribution over the nut threads that should be considered in arriving at a lower contact pressure for simulative wear testing. A model is therefore developed for this coupled evolution of thread load distribution and wear.

scholarly journals Tribological behavior of Ti-6Al-4V and Ti-6Al-7Nb Alloys for Total Hip Prosthesis

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Mamoun Fellah ◽  
Mohamed Labaïz ◽  
Omar Assala ◽  
Leila Dekhil ◽  
Ahlem Taleb ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Hip Prosthesis ◽  
Tribological Behavior ◽  
Wear Behavior ◽  
Femoral Stem ◽  
High Strength ◽  
Wear Performance ◽  
Grain Structures ◽  
Pin On Disc ◽  
Wear Tests

The aim of the study is to evaluate the friction and wear behavior of high-strength alloys Ti-6Al-7Nb used in femoral stem and compare it with a Ti-6Al-4V alloy cylindrical bar corresponding to ISO 5832-3 part 3/01-07-199 standard. The tribological behavior was investigated by wear tests, using ball-on-disc and pin-on-disc tribometers. These tests consisted of measuring the weight loss and the friction coefficient of samples. The oscillating friction and wear tests have been carried out in ambient with oscillating tribotester in accordance with standards ISO 7148, ASTM G99-95a, and ASTM G133-95 under different conditions of normal loads (3, 6, and 10 N) and sliding speeds (1, 15, and 25 mm·s−1). As counter pairs, a 100Cr6 steel ball with 10 mm in diameter was used. Results show that the two alloys had similar friction and wear performance, although their grain structures and compositions are different. Occurrence of large frictional occurred, is probably caused by formation and periodic, localized fracture of a transfer layer. Higher friction with larger fluctuation and higher wear rate was observed at the higher siding speed. The Ti-6Al-4V wear mechanism transforms from ploughing and peeling off wear at low sliding speed to plastic deformation and adhesive wear.

Dry Sliding Wear Behavior of Ti-6Al-4V Alloy

2015 ◽  
Vol 830-831 ◽  
pp. 333-336 ◽  
Author(s):  
M. Ananda Jothi ◽  
S. Ramanathan
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Energy Dispersive Spectrometer ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Wear Rates ◽  
Pin On Disc ◽  
Marine Applications ◽  
Sliding Distance ◽  
Wear Tests

Titanium and its alloys exhibit a unique combination of physical and corrosion resistance properties which make them ideal materials for space flight engine component such as disks and blades of compressor, marine applications, chemical industries and many bio medical applications. However the use of these materials is limited due to its poor tribological properties. Dry sliding wear tests were performed on Ti-6Al-4V using a pin-on-disc (EN31 steel) configuration. Wear rates were measured with different load and sliding velocity at a constant sliding distance. Microstructures of worn surfaces were characterized by scanning electron microscope (SEM) and energy dispersive spectrometer (EDS).

scholarly journals Mechanical and Abrasive Wear Behavior of Metal Sulphide Lubricant Filled Epoxy Composites

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
M. Sudheer ◽  
N. Karthik Madhyastha ◽  
M. Kewin Amanna ◽  
B. Jonthan ◽  
K. Mayur Jayaprakash
Keyword(s):  
Mechanical Properties ◽  
Abrasive Wear ◽  
Detrimental Effect ◽  
Wear Behavior ◽  
Wear Testing ◽  
Wear Loss ◽  
Fiber Damage ◽  
Pin On Disc ◽  
Abrasive Wear Behavior ◽  
Worn Surface

The present work reveals the effect of the addition of commercial MoS2 (10 wt%) particles on mechanical and two-body abrasive wear behavior of epoxy with/without glass fiber mat reinforcement. The composites were fabricated using casting and simple hand lay-up techniques followed by compression molding. The mechanical properties such as density, hardness, tensile, and flexural properties were determined as per ASTM standards. The abrasive wear testing was carried out using pin-on-disc wear tester for different loads and abrading distances at constant speed of 1 m/s. A significant reduction in wear loss and specific wear rate was noticed after the incorporation of MoS2 filler allowing less wear of matrix during abrasion which in turn facilitated lower fiber damage. However the incorporation of MoS2 particles had a detrimental effect on most of the mechanical properties of the composites. The worn surface features were investigated through scanning electron microscopy (SEM) in order to investigate the wear mechanisms.

Dry Sliding Wear Behavior of WC and Cr-C Coatings on Plain Carbon P/M Steel Substrates Using HVOF Coating Method

2017 ◽  
Vol 735 ◽  
pp. 54-58
Author(s):  
D. Shanmugasundaram ◽  
K. Gunasekaran ◽  
R. Chandramouli ◽  
N. Natarajan
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Steel Substrate ◽  
Wear Testing ◽  
Good Effect ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Factors Affecting ◽  
Hvof Coating ◽  
Pin On Disc

The present research paper covers statistical analysis of the major tribological factors affecting the dry sliding wear behavior of Tungsten Carbide (WC) and Chromium Carbide (Cr-C) coatings on plain carbon P/M steel substrate using High Velocity Oxy Flame (HVOF) Coating Technique. Experiments were conducted on pin-on-disc wear testing equipment. The various parameters related to wear such as wear rate, Coefficientof Friction of the coated Disc, Hardness and Surface Roughness were measured.In comparison, WC and Cr-C coating, WC coating has comparably good effect.

scholarly journals Relationship between Al2O3 Content and Wear Behavior of Al+2% Graphite Matrix Composites

2020 ◽  
Vol 27 (1) ◽  
pp. 177-185 ◽  
Author(s):  
D. Simsek ◽  
I. Simsek ◽  
D. Ozyurek
Keyword(s):  
Wear Behavior ◽  
Wear Testing ◽  
Al2o3 Content ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
X Ray ◽  
Graphite Matrix ◽  
Density Values ◽  
Wear Tests

AbstractIn this study, the microstructure and wear behaviours of aluminium composites, reinforced with different amounts of (3-12%) Al2O3 and 2% (% vol.) graphite were investigated. The Al2O3 and graphite were added to Al matrix and mechanically alloyed for 60 minutes. Subsequently, the mechanically alloyed powders were pressed under 700MPa pressure and sintered at 600∘C for 120 minutes. The produced aluminium composites were characterized by microstructure, scanning electron microscope (SEM), X-ray diffraction (XRD), density and hardness measurements. Afterwards, wear tests were carried out on a block on-ring type wear testing device, under three different loads and four different sliding distances. As a result, the hardness and density of composites were observed to increase due to the increase in the amount of reinforcement in aluminium composites. The highest hardness and density values were obtained in composite material containing 12% Al2O3. The wear tests, the lowest weight loss was also obtained in composite containing 12% Al2O3.

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