Effect of arc discharge on the wear rate and wear mode transition of a copper-impregnated metallized carbon contact strip sliding against a copper disk

1999 ◽  
Vol 32 (7) ◽  
pp. 367-378 ◽  
Author(s):  
Shunichi Kubo ◽  
Koji Kato
Keyword(s):  
Wear Rate ◽  
Arc Discharge ◽  
Mode Transition ◽  
Copper Disk ◽  
Wear Mode ◽  
Contact Strip

Friction coefficient and wear mode transition in micro-scale abrasion tests

2011 ◽  
Vol 44 (12) ◽  
pp. 1878-1889 ◽  
Author(s):  
R.C. Cozza ◽  
D.K. Tanaka ◽  
R.M. Souza
Keyword(s):  
Friction Coefficient ◽  
Mode Transition ◽  
Micro Scale ◽  
Wear Mode

The Effect of Interaction Between Neighboring Asperity Contacts on Wear Mode Transition in Sliding Contact of Rough Surfaces

2005 ◽  
Author(s):  
Tomohisa Tanaka ◽  
Chikara Yamanaka ◽  
Keiji Kyogoku ◽  
Tsunamitsu Nakahara
Keyword(s):  
Rough Surfaces ◽  
Sliding Contact ◽  
Contact Boundary ◽  
Mode Transition ◽  
Relative Slip ◽  
Yielding Condition ◽  
Asperity Contacts ◽  
Wear Mode ◽  
The Difference

Concerning the final aim, that is to make clear the mechanism of the wear mode transition from mild to severe belong to the increase of contact pressure in adhesive wear, estimation of the yielding condition in subsurface under contact boundary between rough surfaces was attempted in this study. Especially the effects of interaction between neighboring contacts as well as relative sliding on the yielding area were focused. The contacts between asperities were modeled by the contact between two neighboring hard wedges with the parallel axes and soft plane to be simplified. These models were calculated by commercial FEM solver in 2-dimension. Additionally, the effect of the difference between the heights of two wedges on the yielding region was evaluated by comparing the result with that obtained from the simple model of two wedges with the same height in non-sliding contact. The results showed that the effect of the interaction between adjacent contacts and existence of relative slip motion give significant factors to the yielding state, on the other hand, the height difference between neighboring asperities affects little the determination of the yielding region.

Study on Wear Mode of Silicon Nitride Balls in Lapping Process

2006 ◽  
Vol 304-305 ◽  
pp. 403-407 ◽  
Author(s):  
Bing Hai Lv ◽  
Ju Long Yuan ◽  
Ying Xue Yao ◽  
Z.W. Wang ◽  
B.C. Tao ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Transition Point ◽  
Wear Test ◽  
Mode Transition ◽  
Test Apparatus ◽  
Optical Telescope ◽  
Abrasion Test ◽  
Wear Mode ◽  
Three Body Abrasion ◽  
Three Body

To understand the mechanism involved in the lapping process of the silicon nitride balls, the wear mode is investigated in this paper. The abrasion tests were performed on a ball-plate wear test apparatus with different loads (0~2N/ball) and slurry concentrations (5%wt~30%wt W20 B4C3). The abraded surface is observed by optical telescope. A wear-mode map, which defines the regimes for two-body abrasion or three-body abrasion dominating in the micro-scale abrasion test, is plotted with two axes: load and concentration of abrasive. An empirical formula for the wear mode transition is adopted to calculate the transition point S*, which can then used to predict the wear mode in lapping process of silicon nitride ball.

Relationship between test severity and wear mode transition in micro-abrasive wear tests

Wear ◽  
2007 ◽  
Vol 263 (1-6) ◽  
pp. 111-116 ◽  
Author(s):  
R.C. Cozza ◽  
J.D.B. de Mello ◽  
D.K. Tanaka ◽  
R.M. Souza
Keyword(s):  
Abrasive Wear ◽  
Mode Transition ◽  
Wear Mode ◽  
Wear Tests

Effects of Arc Discharge on Wear Properties of Carbon-Carbon Composites Sliding against Cu Trolley under Electric Current

2011 ◽  
Vol 675-677 ◽  
pp. 407-410 ◽  
Author(s):  
Dao Chun Hu ◽  
Lei Wang ◽  
Le Min Sun
Keyword(s):  
Wear Rate ◽  
Electric Current ◽  
Arc Discharge ◽  
Orthogonal Design ◽  
Specific Wear Rate ◽  
Carbon Composites ◽  
Wear Properties ◽  
Material Transfer ◽  
Lubrication Film ◽  
Contact Points

Influence of arc discharge to the contact strip of carbon-carbon composites was orthogonally studied on the HST-100 tribo-tester under electric current, which simulated working conditions of the pantograph-wire system used in electric railway. The regression equation between specific wear rate and arc discharge were obtained and analyzed through the non-linear regression and orthogonal design. The results of the experiments show that a power function between specific wear rate and arc discharge was obtained. Microstructure and phase composition were observed and analyzed by scanning electron microscope(SEM), energy dispersive X-ray spectrum(EDS) and temperature sensor. The results revealed that the arc discharge dissipation seriously affects tribological characteristics of the carboncarbon composites. The temperature of some local contact points beyond their melting point with the electric arc heat effect, and give rise to the desposite carbon and friber carbon were vaporazated, which form the lubrication film on the wear surface, and with the augmant of the arc discharge, the area of lubrication film of carbon was decrease. Therefore, the main wear form of the arc erosion of the carbon-carbon composites is evaporate erosion and material transfer.

Mode Transition of Vacuum Arc Discharge and Its Effect on Ion Current

2014 ◽  
Vol 31 (10) ◽  
pp. 105202 ◽  
Author(s):  
Chao-Hui Lan ◽  
Ji-Dong Long ◽  
Le Zheng ◽  
Yu-Fei Peng ◽  
Jie Li ◽  
...  
Keyword(s):  
Arc Discharge ◽  
Ion Current ◽  
Vacuum Arc ◽  
Mode Transition

Surface Modification of Broaches from the Powder High Speed Steels Applied to Processing of Aviation Products from Heat-Resistant Alloys

2014 ◽  
Vol 1064 ◽  
pp. 142-147 ◽  
Author(s):  
Sergey Nikolaevich Grigoriev ◽  
Natalia Cherkasova ◽  
Pavel Filatov ◽  
Alexey Anatolevich Vereschaka
Keyword(s):  
Surface Modification ◽  
Wear Rate ◽  
High Speed ◽  
Arc Discharge ◽  
Vacuum Arc ◽  
Complex Treatment ◽  
Alloyed Powder ◽  
Ion Nitriding ◽  
Heat Resistant ◽  
Complex Hardening

This paper considers an approach to improve durability of broaching tools made of high alloyed powder metallurgical high-speed steels by complex treatment which includes ion nitriding and following deposition of wear-resistant coating (Nb, Ti,Al)N using two-stage vacuum-arc discharge. Broaching tools complex hardening conditions which provide minimal wear rate when machining heat-resistant nickel alloy Inconel 718 used for turbine discs are defined.

High-Temperature Tribology of AA5052/ZrB2 PAMCs

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Narendra Kumar ◽  
Gaurav Gautam ◽  
Rakesh Kumar Gautam ◽  
Anita Mohan ◽  
Sunil Mohan
Keyword(s):  
High Temperature ◽  
Wear Rate ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Unreinforced Alloy ◽  
Volume Percentage ◽  
Increase With Increase ◽  
Wear And Friction ◽  
Wear Mode ◽  
Worn Surface

AA5052/ZrB2 particulate aluminum matrix composites (PAMCs) have been produced by in situ reaction of K2ZrF6 and KBF4 compounds with molten alloy at about 860 °C. Dry sliding wear and friction of composites have been investigated for a particular sliding velocity and sliding distance at different loads from ambient temperature to 200 °C. It is revealed that for a particular load and temperature, wear rate and normalized wear rate decrease with increase in the volume percentage of ZrB2 particles whereas coefficient of friction (COF) shows a reverse trend. Wear rate and COF also increase with increase in temperature for a constant load and composition. Whereas with load for a particular temperature, wear rate and wear rate per unit vol. % ZrB2 increase while COF decreases. Worn surface and wear debris morphology examined under scanning electron microscopy (SEM) and profilometer to understand the wear mechanism revealed that wear mode transition takes place from mild-oxidative to severe-metallic at 100 °C for unreinforced alloy, whereas a shifting is observed in transition temperature from 100 to 150 °C for composite with 9 vol. % ZrB2 particles. Energy dispersive spectroscopy (EDS) analysis of worn surface confirms the oxidative wear mode. Profilometry results indicate that wear surface has higher surface roughness at higher values of load and temperatures. Prior to wear and friction studies, composites were also characterized by X-ray diffraction (XRD) and SEM for morphology and microstructural characteristics to correlate with wear results. The findings are very helpful to make the AA5052/ZrB2 composites suitable for the applications, where high-temperature wear is a limiting factor.

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