Study and Optimization of Metal Based Sintered Materials for Automotive Brake Friction Production

2016 ◽  
Vol 254 ◽  
pp. 20-26 ◽  
Author(s):  
Ildiko Peter ◽  
Mario Rosso
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Cost Effective ◽  
Wear Properties ◽  
Electron Microscopies ◽  
High Durability ◽  
Constant Friction ◽  
Different Temperatures ◽  
Materials Used ◽  
Application Optimization

The study aims obtaining materials with a high and constant friction coefficient, a high durability and thermal stability that is associated to a lower wear rate, to the absence of noise during braking and to good self-brazing capacity. Cu and Fe-based friction materials have been sintered and the influence of the loading graphite and ceramic filler powders on the friction and wear properties were investigated. Optimization of the composition and of the sintering method were performed targeting to obtain higher tribological properties, compared to the actually produced polymer matrix materials used for the same purpose, in a cost-effective way. The samples, sintered at different temperatures were observed by optical and scanning electron microscopies, while the tribological behavior was investigated by the evaluation of the friction coefficient and wear rate. The worn surfaces of the wear samples were analyzed: principally an abrasive wear was revealed, explained mostly by the presence of ceramic particles. Moreover, due to the high pressure applied combined to an increased temperature, the presence of adhesive wear was detected. The experimentally achieved results show that using a Cu based material with a moderate graphite and ceramic content is a promising material for the considered application. Optimization of the noise reduction during braking is undergoing.

Water Absorption, Friction and Wear Behaviors of Polypropylene Composites Filled with Hydroxyapatite

2017 ◽  
Vol 733 ◽  
pp. 60-64
Author(s):  
Munir Tasdemir ◽  
Ozkan Gulsoy
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Water Absorption ◽  
Polymer Composites ◽  
Friction And Wear ◽  
Wear Properties ◽  
Polypropylene Composites ◽  
Friction And Wear Properties

In the present work, the friction and wear properties of Polypropylene (PP) based composites filled with Hydroxyapatite (HA) particles were studied. Fillers contents in the PP were 10, 20, and 30 wt%. The effects of hydroxyapatite ratio on the water absorption, friction and wear properties of the polymer composites is presented. The result showed that the addition of HA to the composite changed the water absorption, friction coefficient and wear rate.

scholarly journals Fabrication and Tribological Properties of Copper Matrix Solid Self-Lubricant Composites Reinforced with Ni/NbSe2 Composites

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1854
Author(s):  
Fei-xia Zhang ◽  
Yan-qiu Chu ◽  
Chang-sheng Li
Keyword(s):  
Powder Metallurgy ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Copper Matrix ◽  
Wear Properties ◽  
Disk Friction ◽  
Friction Reducing ◽  
Properties Of Composites

This paper presents a facile and effective method for preparing Ni/NbSe2 composites in order to improve the wettability of NbSe2 and copper matrix, which is helpful in enhancing the friction-reducing and anti-wear properties of copper-based composites. The powder metallurgy (P/M) technique was used to fabricate copper-based composites with different weight fractions of Ni/NbSe2, and tribological properties of composites were evaluated by using a ball-on-disk friction-and-wear tester. Results indicated that tribological properties of copper-based composites were improved by the addition of Ni/NbSe2. In particular, copper-based composites containing 15 wt.% Ni/NbSe2 showed the lowest friction coefficient (0.16) and wear rate (4.1 × 10−5 mm3·N−1·m−1) among all composites.

scholarly journals Effects of Temperature on Wear Properties and Mechanisms of HVOF Sprayed CoCrAlYTa-10%Al2O3 Coatings and H13 Steel

Metals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1224
Author(s):  
Zheng Wei ◽  
Yuping Wu ◽  
Sheng Hong ◽  
Weihua Yang ◽  
Wei Shi
Keyword(s):  
Wear Rate ◽  
Wear Properties ◽  
H13 Steel ◽  
Hvof Spraying ◽  
Different Temperatures ◽  
Effects Of Temperature ◽  
Increasing Temperature ◽  
Worn Surface ◽  
Oxygen Fuel ◽  
Better Than

In this study, the CoCrAlYTa-10%Al2O3 coatings were prepared by the high-velocity oxygen-fuel (HVOF) spraying. A series of ball-on-disk sliding wear tests were conducted to evaluate the tribological properties of the coatings at different temperatures (25 °C, 200 °C, 400 °C, and 600 °C). The results showed that the average coefficients of friction (COFs) of the CoCrAlYTa-10%Al2O3 coatings were lower than that of H13 steel at different temperatures. The average COFs of the CoCrAlYTa-10%Al2O3 coatings and H13 steel both decreased with increasing temperature. The wear rate of the CoCrAlYTa-10%Al2O3 coatings increased first and then decreased. The microhardness of worn surface of the CoCrAlYTa-10%Al2O3 coatings increased with increasing temperature, while the microhardness of worn surface of H13 steel at 25 °C and 200°C was higher than that at 400 °C and 600 °C. The wear mechanism of the two materials was mainly abrasive wear. The tribofilms were formed on the worn surface of the CoCrAlYTa-10%Al2O3 coatings, which had a good protective effect. Due to thermal softening and low binding strength of debris, it was difficult for H13 steel to form the tribofilms. The wear rate of H13 steel was much higher than that of the CoCrAlYTa-10%Al2O3 coatings at 400 °C and 600 °C, indicating that the high temperature wear resistance of the coatings was much better than that of H13 steel.

Wear Properties of DLC and Plasma Sprayed WC Structure Coating

2007 ◽  
Vol 127 ◽  
pp. 245-250 ◽  
Author(s):  
Mitsuyasu Yatsuzuka ◽  
Yoshihiro Oka ◽  
Akifumi Tomita ◽  
Noritaka Murata ◽  
Mitsuaki Hirota
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Testing Machine ◽  
Carbon Film ◽  
Wear Testing ◽  
Wear Properties ◽  
Dlc Film ◽  
Coated Metal ◽  
Hydrocarbon Gas ◽  
Plasma Sprayed

Diamond-like carbon film (DLC) with an interlayer of plasma sprayed tungsten-carbide (WC) was prepared on an aluminum alloy substrate (A5052) by a hybrid process of plasma-based ion implantation and deposition using hydrocarbon gas. Typical thicknesses of DLC and WC films were 1 μm and 100 μm, respectively. The hardness and friction coefficient of DLC were typically 15 GPa and 0.15, respectively. The durability of DLC/WC/A5052 system was evaluated from the measurement of the friction coefficient by a ball-on-disk friction tester in which the loaded ball was drawn repeatedly across a sample and the load was increased with each traverse. For the DLC/A5052 system, which has no WC interlayer, the DLC film was broken quickly because of distortion of the substrate. For the DLC/WC/A5052 system, on the other hand, the DLC film was excellent in durability for long running. The wear rate of rubber rotor to the metal rotor was measured by a roller-pitching-type wear testing machine, showing large reduction in wear rate using DLC-coated metal rotor.

Surface Wear Anisotropy in AlSi10Mg Alloy Sample Fabricated by Selective Laser Melting: Effect of Hatch Style, Scan Rotation and Use of Fresh and Recycled Powder

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Ashish Kumar Mishra ◽  
Ram Krishna Upadhyay ◽  
Arvind Kumar
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Selective Laser Melting ◽  
Wear Behavior ◽  
Alloy Sample ◽  
Surface Wear ◽  
Wear Properties ◽  
Laser Melting ◽  
Pattern Size ◽  
Scan Pattern

Abstract Additive manufacturing (AM) has witnessed substantial growth in recent years due to its excellent manufacturing capabilities and innovative production methodologies. However, the mechanical suitability aspect in terms of material wear has not received much attention yet and needs rigorous assessment. This study investigates the wear anisotropy in an AlSi10Mg alloy sample fabricated by selective laser melting (SLM) technique. Different scanning strategies encompassing the island and the continuous scanning patterns were used in sample manufacturing. The effects of the scanning vector orientation, design pattern, and the island pattern size on the mechanical wear and wear anisotropy have been analyzed in detail. The study also focused upon a comparative investigation of the wear properties at the top and the side surfaces to understand the wear anisotropy in different directions. The samples are fabricated both by the fresh and the recycled powder and the role of powder state is described. The ball-on-disk test is performed to simulate the similar contact applications for marine/automotive components such as bearings. Bearing steel balls are used as a standard sliding counterpart material to investigate the wear properties. The wear microstructure is analyzed by scanning electron microscopy. Overall, the island strategy with 2 mm hatch style and 45 deg scan rotation have achieved better wear resistance and friction coefficient compared with the continuous hatch style. The wear behavior is found to be anisotropic. The Raman spectra validate the presence of silicon and carbon particles on the wear track, which have a significant effect on the tribological properties. The type of particles present in the sliding zone characterizes different wear stages. Wear mechanism is described by considering four parameters, namely, scan pattern, scan vector rotation, type of powder, and the wear measurement direction. Results show that the surface wear rate of samples made by the fresh powder is lower than the recycled powder. However, samples of the recycled powder have friction modifier characteristics. The best wear rate and friction coefficient values are obtained with the island strategy (2 mm hatch, 45 deg scan rotation) in the side plane and are 3.76 × 10−6 mm3/N m, 0.0781, respectively.

Effects of Primary Si and Applied Load on the Dry Sliding Wear Behaviors of Hypereutectic Al-20Si Alloy

2014 ◽  
Vol 490-491 ◽  
pp. 83-87
Author(s):  
Qing Lin Li ◽  
Tian Dong Xia ◽  
Ye Feng Lan ◽  
Yi Sheng Jian
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Sliding Wear ◽  
Applied Load ◽  
Rate Increase ◽  
Treatment Temperature ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Wear Properties ◽  
Primary Si

The effects of the primary Si phase and applied load on the dry sliding wear behaviors of hypereutectic Al-20Si alloy were investigated. The results show that coarse polygonal and star-like primary Si was refined into fine blocky shape by increasing superheat treatment temperature. The friction coefficient and wear rate significantly decrease after decreasing the size and changing the morphology of primary Si. Moreover, the friction coefficient and wear rate increase with the increase of applied load. Therefore, the wear properties are greatly influenced by the parameters like morphology and size of primary Si as well as applied load.

Effect of Various Nanoparticles on Friction and Wear Properties of Glass Fiber Reinforced Epoxy Composites

2010 ◽  
Vol 150-151 ◽  
pp. 1106-1109 ◽  
Author(s):  
Yong Kun Wang ◽  
Li Chen ◽  
Zhi Wei Xu
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Glass Fiber ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Specific Wear Rate ◽  
Wear Properties ◽  
Nano Tio2 ◽  
Nano Sio2 ◽  
Multi Walled Carbon Nanotubes

The glass fiber (GF) reinforced epoxy (EP) composites filled by nano-Al2O3, nano-TiO2, nano-SiO2 and multi-walled carbon nanotubes (MWCNTs) were prepared. The friction and wear behavior of composites under dry condition were evaluated with block-on-ring friction and wear tester. The morphologies of the worn surfaces of the composites were analyzed by scanning electric microscopy (SEM). The results show that 0.5 wt% MWCNTs and nano-TiO2 can significantly lower the friction coefficient and specific wear rate of composites, respectively, while 0.5 wt% nano-SiO2 and nano-Al2O3 can slightly lower the friction coefficient and specific wear rate of the composites.

Study on the High-Heat Tribological Characteristics of Lubricating Wear-Resisting Coating Prepared by Supersonic Plasma Spraying

2011 ◽  
Vol 80-81 ◽  
pp. 661-666
Author(s):  
Yun Cai Zhao ◽  
Jia Jia Mao ◽  
Chun Ming Deng ◽  
Wem You Ma
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Plasma Spraying ◽  
High Heat ◽  
The Self ◽  
Tribological Characteristics ◽  
Wear Properties ◽  
Abrasive Resistance ◽  
Supersonic Plasma

This paper is about the study of the KF301/WS2composite lubrication wear-resisting coatings prepared by supersonic plasma spraying. Basing on the research of the tribological characteristics, it has been discussed the self-lubricity and the failure mechanism showed by composite lubrication coatings under high-temperature conditions. Research shows that the wear rate of the coatings increased with the increase of the temperature. At 300°C, the wear rate is 1.02×10-4mg/m; At 750°C, the wear rate is 2.61×10-4mg/m. With the increase of temperature, friction coefficient of the coatings shows gradually increasing. When the temperature falls below 600°C, friction coefficient keeps around 0.08; At 750°C, the friction coefficient is 0.12. Temperature has great effect on the friction and wear properties ofthe self-lubricating wear-resisting coatings, mainly manifests in two aspects: first, with the increase of the temperature, under the common influence of thermal stress and frictional contact stress, it promotes the WS2solid lubricant film cracking, breakage, shedding process, and lubrication and abrasive resistance reduces; on the other hand, the WS2occurs chemical reaction under high temperature, generating lubricity phase of NiWO4, CrS, and lubricity phases are well supplied, lubricating film has an effect of continuous lubrication on the rubbing surface, So the coating shows low-friction, and it also represents that the KF-301/ WS2self-lubricating composite coating has good lubrication and abrasive resistance under high temperature．

scholarly journals Effects of CeO2 Content on Friction and Wear Properties of SiCp/Al-Si Composite Prepared by Powder Metallurgy

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4547
Author(s):  
Bin Yang ◽  
Aiqin Wang ◽  
Kunding Liu ◽  
Chenlu Liu ◽  
Jingpei Xie ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Wear Properties ◽  
Minimum Value ◽  
Maximum Value ◽  
Friction And Wear Properties

SiCp/Al-Si composites with different CeO2 contents were prepared by a powder metallurgy method. The effect of CeO2 content on mechanical properties, friction and wear properties of the composites was studied. The results show that with the increase in CeO2 content from 0 to 1.8 wt%, the density, hardness, friction coefficient of the composites first increases and then decreases, the coefficient of thermal expansion (CTE) and wear rate of the composites first decreases and then increases. When the content of CeO2 was 0.6 wt%, the density and hardness of the composite reached the maximum value of 98.54% and 113.7 HBW, respectively, the CTE of the composite reached the minimum value of 11.1 × 10−6 K−1, the friction coefficient and wear rate of the composite reached the maximum value of 0.32 and the minimum value of 1.02 mg/m, respectively. CeO2 has little effect on the wear mechanism of composites, and the wear mechanism of composites with different CeO2 content is mainly abrasive wear under the load of 550 N. Compared with the content of CeO2, load has a great influence on the wear properties of the composites. The wear mechanism of the composites is mainly oxidation wear and abrasive wear under low load. With the increase in load, the wear degree of abrasive particles is aggravated, and adhesive wear occurs under higher load.

Effect of Graphite on the Friction and Wear Properties of Cu-Based Friction Materials

2014 ◽  
Vol 788 ◽  
pp. 621-626 ◽  
Author(s):  
Jing Dan Wei ◽  
Hua Chen
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Friction And Wear ◽  
Wear Properties ◽  
Friction Materials ◽  
Graphite Content ◽  
Lubricating Film ◽  
Properties Of Materials ◽  
Friction And Wear Properties ◽  
High Graphite

Cu-based friction materials were prepared by powder metallurgy technology. The effect of the graphite on friction and wear properties of materials was investigated. The experimental results indicate that the wear rate of the materials increased with increasing speed. The wear rate of the materials with the graphite with the size of 300~600μm decreased with increasing graphite content, indicating that the graphite size of 300~600μm showed the good lubricating effect. The lubricating film made the friction coefficient decrease. The wear resistance of materials with 100~300μm graphite was degraded at high graphite content, and the graphite size of 100~300μm has bad effect on the strength of materials. The wear debris made the friction coefficient slightly increase with the increase of graphite content. The material with the graphite content of 10% and the graphite size of 300~600μm has the best friction and wear properties.

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