Influence of Thermal Effects Produced by Laser Treatment on the Tribological Behavior of Porcelain Ceramic Tiles

2009 ◽  
Vol 423 ◽  
pp. 41-46 ◽  
Author(s):  
F. Gutiérrez Mora ◽  
Arturo Domínguez-Rodríguez ◽  
V.V. Lennikov ◽  
G.F. de la Fuente
Keyword(s):  
Experimental Data ◽  
Wear Rate ◽  
Laser Treatment ◽  
Thermal Effects ◽  
Tribological Behavior ◽  
Fracture Propagation ◽  
Ceramic Tiles ◽  
Severe Wear

Commercial porcelain ceramic tiles have been irradiated with a laser to evaluate the thermal effects on their surface and in their tribological behavior. Different irradiation patterns were followed, varying the density of points where the laser was focused, from 25 to 150 dots per inch. Hardness and toughness were evaluated using Vickers indentations. Tribological behavior was studied using a ball-on-flat apparatus with alumina balls. An increase in the wear rate was observed in the higher irradiated samples, which can be correlated to a decrease in their toughness. A mechanism of severe wear by fracture propagation and material pullout is proposed to explain the experimental data and the observed corresponding microstucture.

X-ray analysis of mechanical and thermal effects induced by femtosecond laser treatment of aluminum single crystals

2006 ◽  
Vol 252 (13) ◽  
pp. 4691-4695 ◽  
Author(s):  
S. Valette ◽  
R. Le Harzic ◽  
E. Audouard ◽  
N. Huot ◽  
R. Fillit ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Single Crystals ◽  
Laser Treatment ◽  
Thermal Effects ◽  
X Ray

The Sliding Wear Behavior of Titanium Carbide Dispersion-Reinforced Steel

2007 ◽  
Vol 124-126 ◽  
pp. 1573-1576
Author(s):  
Jeong Keun Lee
Keyword(s):  
Wear Rate ◽  
Titanium Carbide ◽  
Sliding Wear ◽  
Wear Track ◽  
Tribological Behavior ◽  
Wear Behavior ◽  
Matrix Composites ◽  
Powder Metallurgy Technique ◽  
Sliding Velocity ◽  
Reinforced Steel

The tribological behavior of TiC-based metal matrix composites was investigated via measuring counterpart weight. The composites were prepared using powder metallurgy technique. Wear of counterpart by the composites varying from 35 to 45 % by volume Titanium carbide were observed over a load ranges of 9.81 to 49.05 N and sliding velocities of 2.0, 2.2, 2.4, 2.6, 2.8 and 3.0 m/sec. Detailed wear track micro-graphy was done to verify the effect of sliding condition on wear mechanism. Observations indicate that wear rate of counterpart increases with the increase in load and the sliding velocity and discontinuous wear rate change occurs at a certain load.

Filler Dispersion and Unidirectional Sliding Characteristics of As-Cast and Multi-Pass Friction Stir Processed ZrB2/AA7075 In-Situ Composites

2020 ◽  
Vol 143 (8) ◽  
Author(s):  
Rabindra Prasad ◽  
Harikishor Kumar ◽  
Parshant Kumar ◽  
S. P. Tewari ◽  
J. K. Singh
Keyword(s):  
Wear Rate ◽  
Friction Stir Processing ◽  
Tribological Behavior ◽  
Al Alloy ◽  
Scanning Electron Micrographs ◽  
Alloy Matrix ◽  
In Situ Composites ◽  
Friction Stir ◽  
Filler Dispersion

Abstract Despite the fabrication of particulate-reinforced composites via friction stir processing (FSP), an attempt was made to utilize FSP for the homogenization of filler dispersion in ZrB2/AA7075 in-situ composites fabricated via stir casting route, with varying weight percentages of ZrB2. The friction stir processing was performed for up to three passes with 100% overlap. The as-cast and friction stir processed (FSPed) composites were characterized for their microstructural, microhardness, and tribological behavior. The microstructural features revealed the increase in the misorientation angle among grain boundaries, with an increase in ZrB2 content and a number of FSP passes. Furthermore, the homogeneity of ZrB2 particles in the Al alloy matrix was significantly influenced by the number of FSP passes, which was quantified by Lorenz curves and Gini Indices. The FSPed alloy and composites exhibited higher microhardness as compared to their un-processed counterparts. The tribological behavior was investigated for three different load levels, i.e., 15 N, 30 N, and 45 N. The slope of the wear-rate at 45 N revealed that the Al-alloy exhibited a considerable increase in wear severity, whereas as-cast and FSPed composites did not show a significant increase. Both wear-rate and coefficient of friction decreased with an increase in the number of FSP passes and ZrB2 content. The scanning electron micrographs of worn surfaces confirmed the reduction in adhesion, abrasion, and delamination with the number of FSP passes. However, the synergism among the three depicted the overall tribological behavior.

Torsional tribological behavior of polytetrafluoroethylene composites filled with hexagonal boron nitride and phenyl p-hydroxybenzoate under different angular displacements

2015 ◽  
Vol 67 (2) ◽  
pp. 139-149 ◽  
Author(s):  
Shibo Wang ◽  
Bo Cao ◽  
Bing Teng
Keyword(s):  
Boron Nitride ◽  
Wear Rate ◽  
Tribological Behavior ◽  
Hexagonal Boron Nitride ◽  
Specific Wear Rate ◽  
Partial Slip ◽  
Torsional Angle ◽  
Content Type ◽  
Angular Displacements ◽  
Ptfe Composites

Purpose – The purpose of this paper is to investigate the effect of hexagonal boron nitride (h-BN) and poly (phenyl p-hydroxybenzoate) (PHBA) on improving the torsional tribological behavior of polytetrafluoroethylene (PTFE). Design/methodology/approach – This paper investigates the torsional tribological behavior of PTFE composites filled with h-BN and PHBA under different angular displacements with a plane-on-plane torsional friction tester. The worn surface of PTFE composites was investigated by using a scanning electron microscope. Findings – The shape of T–Θ curves of PTFE composites was influenced by both content fillers and torsional angule. The material with a higher coefficient of sliding friction exhibited the larger torsional angle under which the torsional regime transited from a partial slip to a gross slip. PTFE composites filled with 20 weight per cent PHBA and 10 weight per cent h-BN showed the best anti-wear properties. The specific wear rate of composites exhibits a negative correlation with material hardness. The wear volume loss presents a positive correlation with friction dissipation energy. The specific wear rate of all composites decreased with increasing torsional angle. The dominant wear mechanism of pure PTFE was adhesive wear. The slight plastic flow and plowing occurred on the worn surfaces of PTFE composites because of the higher hardness of composites and the lubrication of h-BN particles with layer crystal structure. Originality/value – This paper put forward a kind of PTFE composite with low torsional wear rate, which can be used in the sliding slewing bearing or the center plate of a bogie.

Tribology Behavior of Graphene Containing Ni-Based Composite Coating under Room Temperature

2015 ◽  
Vol 642 ◽  
pp. 30-33 ◽  
Author(s):  
Jian Liang Li ◽  
Juan Juan Chen ◽  
Dang Sheng Xiong ◽  
Yong Kang Zhang ◽  
Yong Kun Qin ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Composite Coating ◽  
Room Temperature ◽  
Steel Surface ◽  
Tribological Behavior ◽  
Composite Coatings ◽  
Wear Rates ◽  
Gcr15 Steel ◽  
Cr Coating

The graphene containing Ni-based composite coatings with different graphene addition amounts were prepared on 45 steel surface by using dipulse composite electrodeposition technology. The tribological behavior of composite coating was tested by against GCr15 steel pin under the dry condition. The friction coefficient of composite coating is 20-30% lower than pure Cr coating, their wear rates are almost in the same magnitude. Compared with 45 steel, the friction coefficient of composite coating decreases and wear rate falls over 50%.

scholarly journals Enhancement of the Wear Resistance and Microhardness of Aluminum Alloy by Nd:YaG Laser Treatment

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Haitham T. Hussein ◽  
Abdulhadi Kadhim ◽  
Ahmed A. Al-Amiery ◽  
Abdul Amir H. Kadhum ◽  
Abu Bakar Mohamad
Keyword(s):  
Wear Resistance ◽  
Aluminum Alloy ◽  
Wear Rate ◽  
Laser Treatment ◽  
Vickers Hardness ◽  
Nd:Yag Laser ◽  
Wear Behavior ◽  
X Ray ◽  
Before And After ◽  
Hardness Values

Influence of laser treatment on mechanical properties, wear resistance, and Vickers hardness of aluminum alloy was studied. The specimens were treated by using Nd:YaG laser of energy 780 mj, wavelength 512 nm, and duration time 8 ns. The wear behavior of the specimens was studied for all specimens before and after treatment by Nd:YaG laser and the dry wear experiments were carried out by sing pinon-disc technique. The specimens were machined as a disk with diameter of 25 mm and circular groove in depth of 3 mm. All specimens were conducted by scanning electron microscopy (SEM), energy-dispersive X-ray florescence analysis (EDS), optical microscopy, and Vickers hardness. The results showed that the dry wear rate was decreased after laser hardening and increased Vickers hardness values by ratio of 2.4 : 1. The results showed that the values of wear rate for samples having circular grooves are less than samples without grooves after laser treatment.

Friction and Wear Studies on Polyphenylene Sulfide Filled with a Complex Mixture

2012 ◽  
Vol 184-185 ◽  
pp. 1400-1403
Author(s):  
Li Guo ◽  
Huan Qin Zhu ◽  
Yuan Bao Sun
Keyword(s):  
Wear Rate ◽  
Friction And Wear ◽  
Narrow Range ◽  
Tribological Behavior ◽  
Complex Mixture ◽  
Polyphenylene Sulfide ◽  
Particulate Form ◽  
The Coefficient Of Friction ◽  
Molybdenum Concentrate ◽  
Counterface Roughness

The tribological behavior of PPS filled with molybdenum-concentrate (MC) deposit from Armenia was studied. The deposit MC was a complex mixture of compounds such as MoS2, SO2, CuS, Al2O3, and others. Whereas MC as the filler in particulate form reduced the steady state wear rate of PPS, the optimum reduction in wear was found to occur with the addition of PTFE along with PPS. The behavior of PPS composites made with MC and PTFE sliding against a steel counterface was investigated as a function of the MC and PTFE proportions, sliding speed, and counterface roughness. Of all the above factors, the change in MC proportion, while PTFE was also present, had the greatest effect on the reduction in wear rate. The variation of the coefficient of friction was found to be in the narrow range of 0.27-0.33. The lowest wear rate was found in the case of PPS+ 17vol.%MC+10vol.%PTFE composite sliding at 1.5 m/s against a counterface roughness of 0.1 μm Ra.

Wear performance and its online monitoring of the semimetal brake lining for automobiles

2014 ◽  
Vol 66 (1) ◽  
pp. 100-105 ◽  
Author(s):  
Yan Yin ◽  
Jiusheng Bao ◽  
Lei Yang
Keyword(s):  
Experimental Data ◽  
Wear Rate ◽  
Monitoring System ◽  
Online Monitoring ◽  
Electronic Control Unit ◽  
Wear Performance ◽  
Content Type ◽  
Disc Brakes ◽  
Wear Monitoring ◽  
Brake Lining

Purpose – In order to improving the braking reliability and assuring the driving safety of automobiles, this paper aims at the wear performance and its online monitoring of its brake lining. Design/methodology/approach – The wear performance of the semimetal brake lining for automobiles was investigated on a self-made braking tester for disc brakes. Based on the experimental data, an intelligent forecasting model for the wear rate was established by the artificial neural network (ANN) technology. And by taking it as a core, an online braking wear monitoring system for automobiles was designed. Findings – It is shown that the wear rate rises obviously with the increasing of both initial braking velocity and braking pressure. By the contrast, the initial braking velocity affects the wear rate more seriously. The ANN model trained by the experimental data shows favorable capability for predicting of the wear rate. The big forecasting errors at high velocity and heavy load should be attributed to the jumping of the wear rate at this period. Based on the existed sensors and electronic control unit system of automobiles, the online braking wear monitoring system can be established easily by the ANN technology. Originality/value – A self-made braking tester for disc brakes was used to test the wear performance, which can simulate better the actual disc braking conditions than the standard pin-on-disc friction tester. An online braking wear monitoring system was designed to help improving the braking reliability and safety of automobiles.

Analysis of Thermal Effects in Hydrodynamic Bearings

1986 ◽  
Vol 108 (2) ◽  
pp. 219-224 ◽  
Author(s):  
R. Boncompain ◽  
M. Fillon ◽  
J. Frene
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Thermal Effects ◽  
Reynolds Equation ◽  
Energy Equation ◽  
Heat Transfer Equation ◽  
Reversed Flow ◽  
Theoretical Results ◽  
Generalized Reynolds Equation ◽  
Good Agreement

A general THD theory and a comparison between theoretical and experimental results are presented. The generalized Reynolds equation, the energy equation in the film, and the heat transfer equation in the bush and the shaft are solved simultaneously. The cavitation in the film, the lubricant recirculation, and the reversed flow at the inlet are taken into account. In addition, the thermoelastic deformations are also calculated in order to define the film thickness. Good agreement is found between experimental data and theoretical results which include thermoelastic displacements of both the shaft and the bush.

Sign in / Sign up

Export Citation Format

Share Document