scholarly journals Tribological and Emission Behavior of Novel Friction Materials

Atmosphere ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 1050 ◽  
Author(s):  
Ana Paula Gomes Nogueira ◽  
Davide Carlevaris ◽  
Cinzia Menapace ◽  
Giovanni Straffelini
Keyword(s):  
Wear Mechanisms ◽  
Particle Number ◽  
Tribological Behavior ◽  
Airborne Particles ◽  
Emission Measurement ◽  
Bulk Materials ◽  
Friction Materials ◽  
Wear Rates ◽  
Pin On Disc ◽  
Emission Behavior

The tribological behavior and the related airborne particles emission of three copper-free automotive friction materials are investigated. The tests were conducted using a pin-on-disc tribometer equipped with a specifically designed clean-enclosure chamber for the emission measurement. Particle number concentration from particle size 0.3 µm up to 10 µm and the mass of emitted particles between 1 µm to 10 µm were measured. Particular emphasis was given to the chemical composition of the bulk materials, the friction layers and the emissions, in order to explain the acting wear mechanisms, and the recorded emission of airborne particles. The results indicate that the recorded emissions do not correlate with the friction coefficient and the wear rates, since the wear mechanisms exert a different influence on the tribological and emission behavior of the materials under study.

Wear Behavior of ZrO2-CNF and Si3N4-CNT Nanocomposites

2011 ◽  
Vol 465 ◽  
pp. 495-498 ◽  
Author(s):  
Pavol Hvizdoš ◽  
Annamária Duszová ◽  
Viktor Puchý ◽  
Orsolya Tapasztó ◽  
Peter Kun ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Tribological Behavior ◽  
Wear Behavior ◽  
Carbon Nanofibres ◽  
Wear Rates ◽  
Pull Out ◽  
Pin On Disc ◽  
Material Volume ◽  
Wear Damage ◽  
Sliding Distance

Tribological behavior of ZrO2 and Si3N4 based nanocomposites with addition of carbon nanofibres and nanotubes has been studied by the pin-on-disc technique. Friction coefficients were measured and recorded, wear rates were calculated in terms of material volume loss per load and sliding distance. The wear damage was studied using optical and electron microscopy and its mechanisms were identified. In monolithic materials the dominant wear mechanism was abrasion, in composites with CNF and with higher volume fraction of CNTs (5 and 10%) fiber pull-out and lubricating by the carbon phases occurred.

Effect of size and shape of copper alloys particles on the mechanical and tribological behavior of friction materials

2020 ◽  
Vol 21 (6) ◽  
pp. 613
Author(s):  
Amira Sellami ◽  
Nesrine Hentati ◽  
Mohamed Kchaou ◽  
Mohammad Asaduzzaman Chowdhury ◽  
Riadh Elleuch
Keyword(s):  
Tribological Behavior ◽  
Copper Alloys ◽  
Physical And Mechanical Properties ◽  
Friction Material ◽  
Material Behavior ◽  
Brake Pad ◽  
Friction Materials ◽  
Physical Density ◽  
Pin On Disc ◽  
Young Module

Friction materials are composed of numerous ingredients which differ from nature and particles size. Each ingredient has its own impact on the mechanical and tribological behavior of the material. Brass ingredients have a great impact on the thermal gradient dissipation in the sliding contact between disc and brake pad material. In this research, the influence of different sizes and forms of brass ingredient was studied on the friction material behavior. The physical (density), mechanical (yield strength, young module) and thermal (thermal conductivity and specific heat) properties of the considered composites were characterized. Results proves that only physical and mechanical properties are sensitive to the changes in size and form of brass particles. The tribological behavior of the brake friction materials was also assessed using a pin-on-disc tribometer. The results show that bigger brass particles and their elongated shape allows it to be well embedded on the pad surface during braking application, and thus decreased wear rate . In contrast, the smaller particle decrease the friction stability and it rounded shape increase wear of the material since it tearing from the surface by abrasive wear.

Study on Tribological Behavior and Mechanisms of Weldox960 Steel

2011 ◽  
Vol 415-417 ◽  
pp. 2191-2195
Author(s):  
Ye Fa Tan ◽  
Bin Cai ◽  
Long He ◽  
Sheng Qiang Hao ◽  
Hua Tan ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Abrasive Wear ◽  
Work Hardening ◽  
Wear Mechanisms ◽  
Sliding Friction ◽  
Tribological Behavior ◽  
Critical Value ◽  
Dry Sliding ◽  
Wear Rates ◽  
Oxidation Wear

Weldox960 steel is widely used in mechanical structure of military equipments as anti-wear parts. The tribological behavior and mechanisms of weldox960 steel were investigated under dry sliding friction conditions. The results show that friction coefficient of the steel increases from 0.268 to 0.365 with the increase of load. When the loads are smaller than 8N, the wear rates of the steel are in the range of 0.57~0.67×10-3 mm3/m, and the wear mechanism is multi-plastic deformation wear. If the loads are bigger than 10N, the wear rates increase to the range of 1.29~1.43×10-3 mm3/m, and the wear mechanisms change into delamination of the work-hardening layer and abrasive wear. The friction coefficients keep in a steady state of about 0.31 when the sliding speeds change from 0.05m/s to 0.2m/s. At the low speeds of 0.05m/s and 0.1 m/s, the wear rates are in the range of 1~1.3×10-3 mm3/m and the wear mechanisms are multi-deformation wear and abrasive wear. When the sliding speed increases to a critical value of 0.15m/s, the wear rates increase to 6.2×10-3 mm3/m and the wear mechanisms change into fatigue delamination of the work-hardening layer and multi-plastic deformation wear as well as oxidation wear.

ANN Prediction of Coefficient of Friction and Sliding Wear Rates of Cast Al6061-Si3N4 Composites

2010 ◽  
Vol 159 ◽  
pp. 338-341 ◽  
Author(s):  
C.S. Ramesh ◽  
R. Keshavamurthy ◽  
D. Vineela ◽  
R. Archana
Keyword(s):  
Coefficient Of Friction ◽  
Material Properties ◽  
Sliding Wear ◽  
Friction And Wear ◽  
Tribological Behavior ◽  
Matrix Alloy ◽  
Wide Spread ◽  
Wear Rates ◽  
Cast Composites ◽  
Pin On Disc

This work focuses on the prediction of tribological behavior of cast Al6061-Si3N4 composites using ANN technique owing to its wide spread popularity in accurate predictions of material properties. The cast composites were developed by stir cast method and its tribological behavior were experimentally evaluated using a pin-on-disc tribometer adopting loads and sliding velocities ranging from 20-100N and 0.314-1.574m/s respectively. The predictions of coefficient of friction and wear rates of matrix alloy and the developed cast composites by ANN approach do agree very closely with the experimental data. Keywords: ANN, Composites, coefficient of friction, wear rates.

Mechanical and Tribological Properties of Al2O3-ZrO2 Based Composites Prepared by EPD

2012 ◽  
Vol 507 ◽  
pp. 191-195 ◽  
Author(s):  
Pavol Hvizdoš ◽  
Viktor Puchý ◽  
Daniel Drdlík ◽  
Jaroslav Cihlář
Keyword(s):  
Mechanical Properties ◽  
Chemical Composition ◽  
Friction And Wear ◽  
Tribological Behavior ◽  
Dry Sliding ◽  
Depth Sensing ◽  
Wear Rates ◽  
Mechanical And Tribological Properties ◽  
Pin On Disc ◽  
Indentation Methods

Alumina and both tetragonal and cubic zirconia based composites with various volume fractions of constituents as well as with addition of carbon nanofibers were prepared by EPD. Mechanical properties (hardness, Youngs modulus) were measured by depth sensing indentation methods and related to chemical composition. Tribological behavior was studied using pin-on-disc technique at room temperatures in air at dry sliding. Coefficient of friction and wear rates were measured, the types of wear regimes were observed and damage micromechanisms identified.

Estimation of Tribological Behavior of Al2024-TiB2 In Situ Composite Using GMDH and ANN

2014 ◽  
Vol 592-594 ◽  
pp. 1310-1314 ◽  
Author(s):  
R. Keshavamurthy ◽  
G. Ugrasen ◽  
R. Manasa ◽  
Narasimhe Gowda
Keyword(s):  
Tribological Behavior ◽  
Testing Machine ◽  
Group Method ◽  
Matrix Composites ◽  
Wear Rates ◽  
Pin On Disc ◽  
Handling Technique ◽  
Group Method Data Handling ◽  
Artificial Neural Network Ann

This paper reports on prediction and comparison of tribological behavior of Al2024-TiB2 in-situ metal matrix composites using Group Method Data Handling Technique (GMDH) and Artificial Neural Network (ANN). Experiments were carried out using Pin-On-Disc type testing machine as per ASTM standards by varying the loads and sliding velocities. Two responses namely coefficient of friction and wear rates have been considered for each experiment. It was found that, ANN is the most reliable and accurate technique for prediction compared to GMDH.

An Investigation of the Tribological Behavior of Hf-Based Bulk Metallic Glass and Crystalline Alloys

2020 ◽  
Vol 142 (10) ◽  
Author(s):  
M.D. Abad ◽  
D.J. Browne
Keyword(s):  
Amorphous Alloy ◽  
Mechanical Performance ◽  
Tribological Behavior ◽  
Advanced Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wear Process ◽  
Wear Rates ◽  
Arc Melting ◽  
Pin On Disc

Abstract The use of bulk metallic glasses (BMGs) as advanced materials for many applications is attractive, due to their improved mechanical performance over their crystalline counterparts: typically providing higher strength and hardness. Hafnium-based alloys of two similar compositions were prepared by arc melting and suction casting to produce 6-mm-diameter cast rods of an amorphous alloy and a crystalline one. The selected compositions were Hf48Cu29Ni10Al13 (amorphous) and Hf58Cu20Ni16Ti6 (crystalline), as confirmed by X-ray diffraction. The hardness of the amorphous alloy was higher than that of the crystalline one. A detailed study of their tribological behavior was carried out, using a pin-on-disc wear tester, with tungsten carbide counterface balls. There were no statistically significant differences in friction coefficient or wear-rates between the two materials tested. Adherence of material from the tested alloy to the ball, and vice versa, were detected. No changes to the crystallinity of the bulk samples were induced by the wear process, as determined by X-ray diffraction. However, amorphous debris were obtained from both samples, indicating the possibility of local vitrification of particles detached from the crystalline alloy and confirming thermal stability of the amorphous alloy.

scholarly journals Properties of Journal Bearing Materials That Determine Their Wear Resistance on the Example of Aluminum-Based Alloys

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 535
Author(s):  
Alexander Mironov ◽  
Iosif Gershman ◽  
Eugeniy Gershman ◽  
Pavel Podrabinnik ◽  
Ekaterina Kuznetsova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Journal Bearing ◽  
Tribological Behavior ◽  
Secondary Structures ◽  
Magnesium Content ◽  
Wear Rates ◽  
Relative Extension ◽  
Bearing Materials ◽  
Antifriction Alloys

Potential relations of tribological characteristics of aluminum antifriction alloys with their compositions and mechanical properties were investigated. In this regard, the properties of eight aluminum alloys containing tin from 5.4% to 11% doped with lead, copper, silicon, zinc, magnesium, and titanium were studied. Mechanical properties such as hardness, strength, relative extension, and impact strength were analyzed. Within the tribological tests seizure load and wear of material were evaluated and secondary structures were studied afterwards. The absence of a definitive correlation between tribological behavior and mechanical properties was shown. It was determined that doping tin over 6% is excessive. The seizure load of the alloys increases with the magnesium content. Secondary structures of the alloys with higher wear rates contain one order less magnesium and tin.

scholarly journals Effects of Alkyl-Substituted Polybenzoxazines on Tribological Properties of Non-Asbestos Composite Friction Materials

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 567
Author(s):  
Anun Wongpayakyotin ◽  
Chanchira Jubsilp ◽  
Sunan Tiptipakorn ◽  
Phattarin Mora ◽  
Christopher W. Bielawski ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Composite Materials ◽  
Coefficient Of Friction ◽  
Aromatic Amines ◽  
Underlying Structure ◽  
Methyl Groups ◽  
Friction Materials ◽  
Wear Rates ◽  
Structure Properties ◽  
Crosslink Densities

A series of substituted polybenzoxazines was synthesized and studied as binders in non-asbestos friction composite materials. The structures of the polybenzoxazines were varied in a systemic fashion by increasing the number and position of pendant alkyl (methyl) groups and was accomplished using the respective aromatic amines during the polymer synthesis step. By investigating the key thermomechanical and tribological characteristics displayed by the composite materials, the underlying structure-properties relationships were deconvoluted. Composite friction materials with higher thermomechanical and wear resistance properties were obtained from polybenzoxazines with relatively high crosslink densities. In contrast, polybenzoxazines with relatively low crosslink densities afforded composite friction materials with an improved coefficient of friction values and specific wear rates.

scholarly journals Dry Sliding Behavior of an Aluminum Alloy after Innovative Hard Anodizing Treatments

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3281
Author(s):  
Chiara Soffritti ◽  
Annalisa Fortini ◽  
Anna Nastruzzi ◽  
Ramona Sola ◽  
Mattia Merlin ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Aluminum Substrate ◽  
Dry Sliding ◽  
Aluminum Oxides ◽  
Wear Rates ◽  
Anodic Aluminum ◽  
Hard Anodizing ◽  
Pin On Disc ◽  
Diffuse Reflectance Infrared ◽  
Wear Tests

This work evaluates the dry sliding behavior of anodic aluminum oxides (AAO) formed during one traditional hard anodizing treatment (HA) and two golden hard anodizing treatments (named G and GP, respectively) on a EN AW-6060 aluminum alloy. Three different thicknesses of AAO layers were selected: 25, 50, and 100 μm. Prior to wear tests, microstructure and mechanical properties were determined by scanning electron microscopy (VPSEM/EDS), X-ray diffractometry, diffuse reflectance infrared Fourier transform (DRIFT-FTIR) spectroscopy, roughness, microhardness, and scratch tests. Wear tests were carried out by a pin-on-disc tribometer using a steel disc as the counterpart material. The friction coefficient was provided by the equipment. Anodized pins were weighed before and after tests to assess the wear rate. Worn surfaces were analyzed by VPSEM/EDS and DRITF-FTIR. Based on the results, the GP-treated surfaces with a thickness of 50 μm exhibit the lowest friction coefficients and wear rates. In any case, a tribofilm is observed on the wear tracks. During sliding, its detachment leads to delamination of the underlying anodic aluminum oxides and to abrasion of the aluminum substrate. Finally, the best tribological performance of G- and GP-treated surfaces may be related to the existence of a thin Ag-rich film at the coating/aluminum substrate interfaces.

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