Tribotechnical Properties of Sintered Aluminum Alloys

2014 ◽  
Vol 682 ◽  
pp. 9-13 ◽  
Author(s):  
N.M. Rusin ◽  
A.L. Skorentsev
Keyword(s):  
Wear Resistance ◽  
Composite Materials ◽  
Friction Coefficient ◽  
Aluminum Alloys ◽  
Low Friction ◽  
Frictional Behavior ◽  
Liquid Lubricant ◽  
Sintered Composite ◽  
Tribotechnical Properties ◽  
Sintered Aluminum

The frictional behavior of sintered composite materials based on aluminum with high content of solid intermetallics and soft tin was investigated. It was found that at the moderate pressures and in absence of a liquid lubricant, both types of composites exhibit a low friction coefficient and good wear resistance.

Tribological Behavior of PTFE Nanocomposites Reinforced with PBA Grafted Alumina Nanoparticles

2012 ◽  
Vol 184-185 ◽  
pp. 1380-1383
Author(s):  
Yong Ping Niu ◽  
Xiang Yan Li ◽  
Jun Kai Zhang ◽  
Ming Han ◽  
Yong Zhen Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Wear Resistance ◽  
Friction Coefficient ◽  
Tribological Behavior ◽  
Compression Molding ◽  
Alumina Nanoparticles ◽  
Low Friction ◽  
Grafted Nanoparticles ◽  
Scanning Electron

Polybutyl acrylate (PBA) grafted alumina nanoparticles were synthesized. Polytetrafluoroethylene (PTFE) nanocomposites reinforced with PBA grafted nanoparticles were prepared by compression molding. The effects of PBA grafted nanoparticles on the tribological behavior of the PTFE nanocomposites were investigated on a tribometer. The abrasion mechanisms of the PTFE nanocomposites were investigated by scanning electron microscopy (SEM) of the abraded surfaces. The results show that the addition of PBA grafted nanoparticles maintains low friction coefficient and improves the wear resistance of the PTFE nanocomposites.

Trial on C3N4 Coating Cutter Hard-Dry Cutting on Hardened Steel

2010 ◽  
Vol 33 ◽  
pp. 483-486
Author(s):  
Hai Dong Yang ◽  
Xi Quan Xia ◽  
Zhen Hua Qing
Keyword(s):  
Thermal Conductivity ◽  
Wear Resistance ◽  
Friction Coefficient ◽  
Tool Material ◽  
High Hardness ◽  
Hardened Steel ◽  
Hard Material ◽  
Low Friction ◽  
Dry Cutting ◽  
Coated Tool

The method of “cutting instead of grinding” on hardened steel is always attractive to engineers. To gain this aim the tool material must first be found. C3N4 is a new kind of super hard material and has comparable properties with diamond in high hardness, wear-resistance, low friction coefficient and thermal conductivity. A number of dry-cutting tests were carried out by C3N4-film coated tool on hardened steel, proved the coating tool is suitable for hard dry cutting.

Assessment of Tribological Properties of Low Friction Thin Layers Produced by Vacuum Methods

2019 ◽  
Vol 293 ◽  
pp. 125-140
Author(s):  
Agnieszka Paradecka ◽  
Krzysztof Lukaszkowicz ◽  
Jozef Sondor
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Chemical Analysis ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Structural Changes ◽  
Thin Layers ◽  
Low Friction ◽  
Topographic Analysis ◽  
Steel Substrates

Low friction thin layers are an excellent alternative for conventional coatings. They provide increased life of the elements, to which they were applied, due to enhancing the hardness or chemical and electrochemical resistance. They help to avoid the cracks, oxidation, as well as possible structural changes during the element's work. However, they primarily improve tribological properties by increasing wear resistance and reducing the friction. This also applies to components operating under variable conditions such as load, speed, temperature. The presented article analyzes the properties of various low-friction thin layers deposited by vacuum methods on the steel substrates. DLC, TiC, MoS2, CrCN thin layers were chosen, as they achieve the lowest possible coefficient of friction. In the framework of this work the measurements of adhesion of the investigated layers to the substrate as well as the friction coefficient, chemical analysis, microstructure and topographic analysis of the low-friction layers were carried out.

Effect of Rare Earth Cerium on the Synthesis and Wear-Resistance of Electroless Ni-P-PTFE Coatings

2013 ◽  
Vol 750-752 ◽  
pp. 1996-2002 ◽  
Author(s):  
Da Yong Liu ◽  
Long Gen Li ◽  
Li Sheng Liu
Keyword(s):  
Wear Resistance ◽  
Rare Earth ◽  
Friction Coefficient ◽  
Interfacial Adhesion ◽  
Steel Surface ◽  
Energy Dispersive Spectrometer ◽  
Wear Test ◽  
Low Friction ◽  
Electroless Ni ◽  
Scanning Electron

By adding various concentrations of rare earth cerium into the acidic hypophosphite plating baths, electroless Ni-P-PTFE coatings have been successfully deposited on the surface of shaft made of mild steel. Surface morphology, microhardness and interfacial adhesion of the coatings were characterized by scanning electron microscope equipped with energy dispersive spectrometer, vicker microhardness meter and WS-92 scrape instrument, respectively. Ring-plate wear test was applied to study the friction coefficient and wear resistance of Ni-P-PTFE coating. Results revealed that Ni-P-PTFE coatings deposited with 10ppm or 20ppm cerium in the plating baths show low friction coefficient and high interfacial adhesion,leading to its perfect wear resistance. However, both the interfacial adhesion and wear resistance of the Ni-P-PTFE coatings were decreased drastically as the cerium concentration in the plating baths was exceeds 50ppm.

Comparisons of Tribological Properties of Ti(C,N)/SiC in Water and Seawater

2015 ◽  
Vol 137 (2) ◽  
Author(s):  
Wei Huang ◽  
Haiye Liu ◽  
Xiaolei Wang
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Friction Coefficient ◽  
Flat Surface ◽  
High Temperature Strength ◽  
Low Friction ◽  
Sliding Speed ◽  
Silica Colloid ◽  
Salt Ions ◽  
Surface Profiles

Ti(C,N)-based cermets offer good high temperature strength, perfect chemical stability, excellent wear resistance, and relatively better machinability. In the present work, the tribological behaviors of Ti(C,N)/SiC sliding pairs lubricated in water and seawater were evaluated using a ball-on-disk tribometer. The experimental results show that a relatively low friction coefficient (about 0.025) can be obtained when lubricated with artificial seawater at the sliding speed of 200 mm/s, while the friction coefficient is about 0.2 in purified water. The wear surface profiles and the lubricants collected after running-in process for the high and low friction conditions were compared. In addition, the effects of salt molar concentration of the lubricant on the Ti(C,N)/SiC friction properties were investigated. It was found that the smooth and flat surface is the premise to gain the low friction. At the same time, the proper concentration of silica colloid, which is affected by the salt ions, is also an essential one. Moreover, the high sliding speed (200 mm/s) is beneficial to achieve low friction.

Structure and Tribotechnical Properties of Al-Sn Alloys Prepared by the Method of Liquid-Phase Sintering

2014 ◽  
Vol 1040 ◽  
pp. 166-170 ◽  
Author(s):  
N.M. Rusin ◽  
A.L. Skorentsev ◽  
E.A. Kolubaev
Keyword(s):  
Wear Resistance ◽  
Liquid Phase ◽  
Friction Coefficient ◽  
Dry Friction ◽  
Liquid Phase Sintering ◽  
Aluminium Matrix ◽  
Tribotechnical Properties ◽  
Pure Metals ◽  
Sintered Alloys ◽  
Skeleton Structure

The structure and tribotechnical properties of sintered Al-Sn alloys were studied. It was pointed that the sintering of pure metals powders allows save the skeleton structure of aluminium matrix at the enlarging concentration of tin up to 50% that twice higher its content in commercial alloys this system. It was established that the high Sn content in sintered alloys leads to their well wear resistance under the dry friction conditions, but it not has an influence on the value of friction coefficient.

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