THE WEAR BEHAVIOR OF BRUSH-PLATED Ni-W-Co/SiC COMPOSITE LAYER WITH OIL LUBRICATION

2005 ◽  
Vol 12 (04) ◽  
pp. 573-578
Author(s):  
JIANG XU ◽  
WENJIN LIU
Keyword(s):  
Wear Behavior ◽  
Profile Analysis ◽  
Composite Layer ◽  
High Wear Resistance ◽  
Oil Lubrication ◽  
Average Size ◽  
1045 Steel ◽  
Worn Surface ◽  
Xrd And Tem ◽  
Laser Profile

The wear behavior of brush-plating a Ni-W-Co/SiC composite layer on 1045 steel with oil lubrication is investigated. The composite layer is determined by OM, XRD and TEM. The worn surface of the plated layer is observed with SEM and laser profile analysis. The composition and average size of worn debris are analyzed by means of ferrograph and fluid spectrum. The results show that the brush-plated composite layer with added SiC particles reveals high wear resistance compared to the Ni-W-Co brush-plated layer.

Study on Friction and Wear Behavior of GCr15/1045 Steel under Nano-Particle Additive Conditions

2011 ◽  
Vol 189-193 ◽  
pp. 38-41
Author(s):  
Wen Jian Wang ◽  
Hong Zhuo ◽  
Jun Guo ◽  
Qi Yue Liu
Keyword(s):  
Friction And Wear ◽  
Wear Behavior ◽  
The Self ◽  
Nano Particles ◽  
Nano Particle ◽  
Friction And Wear Behavior ◽  
Repairing Effect ◽  
1045 Steel ◽  
Worn Surface

The aim of this study was to investigate the friction and wear behavior of GCr15/1045 steel under different nano-particle additive conditions using a reciprocating horizontal tribometer. The results indicate that the nano-particle additives could decrease friction coefficient of CGr15/1045 steel and reduce the wear of material compared with the dry condition. Nano-particles play an important role of polishing the micro-gibbosity of contact surfaces during the friction process. The nano-particles of Ca10(PO4)6, TiO2 and TiN can form the self-repairing film on the worn surface of 1045 steel. The analysis indicates that the self-repairing effect of nano-particle of TiN is best and the self-repairing effect of nano-particle of TiO2 is worst.

Direct Synthesis of 3,5-Dinitropyrazole Catalyzed by Newly Sulfated Nanosolid Superacid TiO2/ SO

2011 ◽  
Vol 391-392 ◽  
pp. 1296-1301
Author(s):  
Li Min Xi ◽  
Xin Xin Zhang
Keyword(s):  
Direct Synthesis ◽  
Sol Gel ◽  
Acid Base ◽  
Direct Transformation ◽  
Acid Base Titration ◽  
Optimal Reaction Condition ◽  
Superacid Catalyst ◽  
Average Size ◽  
Optimal Reaction ◽  
Xrd And Tem

The newly sulfated nanosolid superacid TiO2/SO4 prepared by sol-gel method was broadly characterized by acid base titration, XRD and TEM, which identified that the superfine solid TiO2/SO4 showing good dispersibility with average size of 27 nm belongs to kind of crystalline nanoparticles. With the help of the catalyst TiO2/SO4, the optimal reaction condition for direct transformation of pyrazole and nitrosonitric acid into 3, 5-Dinitropyrazole was n (pyrazol)=0.10 mol, m (TiO2/SO4 )＝1.5g, V(n-octannol)＝90mL, and V(nitrosonitric acid)＝50mL. Moreover, the optimal yield of the catalytic reaction reached up to 59.4% when the reaction time is 7 hours. The nanosolid superacid catalyst is still of high activity after regenerating eight times by calcination at 600。C.

Rolling/Sliding Wear Behavior of High Carbon Steel Wire Rod (HSWR) of Traction Machine

2008 ◽  
Author(s):  
Beom-Taek Jang ◽  
Seock-Sam Kim
Keyword(s):  
Wear Behavior ◽  
Steel Wire ◽  
High Carbon Steel ◽  
Wire Rope ◽  
Wear Volume ◽  
Steel Wires ◽  
Volume Curve ◽  
Wide Range ◽  
Lubrication Condition ◽  
Worn Surface

Steel wires are critical load-bearing components in a wide range of applications such as elevator, cranes, mine haulage etc. The traction machine of elevator which transmits power to wire rope causes micro-slip between wire rope and sheave during reciprocating action. The lubrication condition of wire rope is also changed due to the lack of grease. This study focuses on the wear behavior of steel wire and effect of both dry and grease conditions by using the rolling/sliding contact wear tester done under various slip ratios and rolling speeds. The experimental results of the wear volume curve against the number of revolutions under the grease condition are compared with the results under dry condition. The worn surface of steel wire and the size of wear particles were observed by SEM. In order to quantify the wear amount of steel wire we established an equation and finally obtained the wear coefficient.

A Convenient Method for Preparing Well-Dispersed Er2Zr2O7 Nanocrystals

2010 ◽  
Vol 123-125 ◽  
pp. 611-614 ◽  
Author(s):  
Yu Ping Tong ◽  
Rui Zhu Zhang ◽  
Shun Bo Zhao ◽  
Chang Yong Li
Keyword(s):  
Particle Size ◽  
Combustion Synthesis ◽  
Crystal Size ◽  
Lattice Distortion ◽  
Combustion Method ◽  
Treatment Temperature ◽  
Synthesis Process ◽  
Thermal Treatment Temperature ◽  
Average Size ◽  
Xrd And Tem

Well-dispersed fluorite Er2Zr2O7 nanocrystals have been successfully prepared by a convenient salt-assistant combustion method. The effects of calcinations temperature and salt category on the characteristics of the products were investigated by XRD and TEM. The thermal treatment temperature has an important effect on crystal size and lattice distortion of the nanocrystals. The experiment showed that the introduction of salt in the combustion synthesis process resulted in the formation of well-dispersed Er2Zr2O7 nanocrystals. The average size was 30 nm and was in agreement with the XRD result, which indicated that the nanocrystals were uniform in particle size distribution. Moreover, the possible formation process in the salt-assisted combustion synthesis was also analyzed.

Investigation of friction and wear behavior of hydroxyl-functionalized graphene nanoplatelets filled elastomer nanocomposites

2021 ◽  
pp. 146442072110616
Author(s):  
Hasan Kasim ◽  
Adem Onat ◽  
Barış Engin ◽  
İsmail Saraç
Keyword(s):  
Wear Rate ◽  
Tribological Properties ◽  
Wear Behavior ◽  
Normal Load ◽  
Graphene Nanoplatelets ◽  
Rubber Matrix ◽  
High Wear Resistance ◽  
Homogeneous Distribution ◽  
Functionalized Graphene ◽  
Sealing Elements

The use of unfilled pure elastomer parts is limited in friction wheels, roller tires, sealing elements, and dynamic friction air suspension applications requiring high wear resistance. This study investigates the mechanical and tribological properties of new nanocomposites obtained by adding hydroxyl-functionalized graphene nanoplatelets at 1, 4, and 8 phr (parts per hundred rubber) ratios to the carbon black filled main rubber compound of sealing elements designed for axle hubs. The synergistic effect of nanofiller materials on the wear behavior of nanocomposites was tested with a block-on-ring wear tester under dry sliding conditions at 1000 rpm and 15 N normal load conditions. The worn surfaces were examined with scanning electron microscopy and circularly polarized light–differential interference contrast topology microscopy to reveal the wear mechanism. The addition of functionalized graphene nanoplatelets to the nanocomposite compound caused significant changes in tensile strength and elongation values by changing the cross-link density. The wear rate of nanocomposites prepared with graphene nanoplatelets at 1, 4, and 8 phr ratios was 11.15%, 25.24%, and 36.54% lower than the main rubber mixture used, respectively. While the hysteresis loss decreased by 14.83% at 1 phr, this value increased in other filler ratios. Significant differences in temperature change occurred as the amount of filler increased. After the test, the temperature values of nanocomposites with 1 and 4 phr filler ratios were between about 85–89°C, while it was measured as 99°C in nanocomposites with 8 phr filler ratios. It has been observed that the homogeneous distribution of two-dimensional carbon allotropes such as graphene nanoplatelet added to the rubber matrix at the optimum rate will improve tribological properties such as better surface lubrication, low wear rate, and low friction coefficient.

Tribological Performance of a Non Asbestos Organic Brake Pad Using Various Organic and Mineral Fibers

2012 ◽  
Vol 585 ◽  
pp. 559-563
Author(s):  
M.A. Sai Balaji ◽  
K. Kalaichelvan
Keyword(s):  
Wear Behavior ◽  
Testing Machine ◽  
Brake Disc ◽  
Brake Pads ◽  
Degradation Temperature ◽  
Industrial Standards ◽  
Worn Surface ◽  
Acrylic Fibers ◽  
Automotive Brake

Non-Asbestos organic composite friction materials are increasingly used in automotive brake disc pad applications. The present paper deals with the role of various organic fibers Kevlar, Acrylic fibers and the Rock fiber namely the Lapinus fiber on the fade and recovery behavior of friction composites. Three different friction composites were developed with same formulation varying only the percentage of Kevlar, Acrylic and lapinus fibers within the formulation. The formulations containing 13.5% of these fibers were developed as brake pads and designated as NA01, NA02 and NA03 respectively. The chemical and Mechanical properties are tested as per Indian Industrial standards.. The composites are then tested for the tribo-performance using Chase Testing Machine following SAE J661a standards. The fade µ, recovery µ and wear are significantly influenced by the amount and type of fiber combinations. Also the TGA reveals the degradation temperature of these fibers. Composite NA 03 containing Kevlar and lapinus combination is found to have good tribo performance. Worn surface analysis by SEM has proved to be useful in understanding the wear behavior of the composites.

Dry Sliding Wear Behavior of Hot Pressed Fe-28Al and Fe-28Al-10Ti Alloys

2011 ◽  
Vol 306-307 ◽  
pp. 425-428
Author(s):  
Jing Li ◽  
Xiao Hong Fan ◽  
De Ming Sun
Keyword(s):  
Plastic Deformation ◽  
Sliding Wear ◽  
Wear Behavior ◽  
Wear Test ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Long Distance ◽  
Wear Performance ◽  
Testing Conditions ◽  
Worn Surface

Fe-28Al and Fe-28Al-10Ti alloys were prepared by mechanical alloying and hot pressing. The phases and dry sliding wear behavior were studied. The results show that Fe-28Al bulk materials are mainly characterized by the low ordered B2 Fe3Al structure with some dispersed Al2O3 particles. Fe-28Al-10Ti exhibits more excellent wear resistance than Fe-28Al, especially after long distance sliding wear test. There are obvious differences in wear mechanisms of Fe-28Al and Fe-28Al-10Ti alloys under different testing conditions. Under the load of 100N, there is plastic deformation on the worn surface of Fe-28Al. The main wear performance of Fe-28Al-10Ti is particle abrasion, the characteristics of which are micro cutting and micro furrows, but micro-crack and layer splitting begin to form on the surface of Fe-28Al. Under the load of 200N, serious plastic deformation and work-hardening lead to rapid crack propagation and eventually the fatigue fracture of Fe-28Al. Plastic deformation is the main wear mechanism of Fe-28Al-10Ti under the load of 200N, which are characterized by micro-crack and small splitting from the worn surface.

Effect of CNTs Support Diameter on Pt Particles Size and Distribution

2007 ◽  
Vol 119 ◽  
pp. 231-234
Author(s):  
Yong Hwan Kim ◽  
Yon Ki Seo ◽  
Young Rae Cho ◽  
Kwang Ho Kim ◽  
Won Sub Chung
Keyword(s):  
Electrochemical Impedance ◽  
Pt Catalyst ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Optimum Diameter ◽  
Electro Oxidation ◽  
Average Size ◽  
Wet Impregnation Method ◽  
Xrd And Tem ◽  
Supported Pt Catalyst

The Platinum catalysts on the carbon nanotubes(CNTs) supports of various diameters were prepared by wet impregnation method using H2PtCl6 precursor. The samples using 100nm, 15~20nm, 10~15nm and 5~10nm diameters of CNTs and carbon nanofibers(CNFs) are named Pt/t- CNFs, Pt/MWNTs20, Pt/MWNTs10 and Pt/MWNTs5, respectively. The effects of CNTs diameter on the Pt particle size and distribution were investigated by the means of powder XRD and TEM observation. In addition, the electro-catalytic characteristics for methanol electro-oxidation were estimated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques. The average size of Pt particles increases as follows; Pt/MWNTs10 < Pt/MWNTs5 < Pt/MWNTs20 < Pt/t-CNFs. The electro-catalytic characteristics of Pt/MWNTs10 and Pt/MWNTs20 are found to be superior in comparison with the others. For preparation of the most effective supported Pt catalyst, the optimum diameter of CNTs support in the range of 10-20nm, is needed.

Sliding Wear of Cu-Ag Alloy in Cu Cladding Al Contact Wire

2012 ◽  
Vol 538-541 ◽  
pp. 1924-1928
Author(s):  
Ying Hui Zhang ◽  
Bin Yang ◽  
Jing Qin ◽  
Hong Bo Sui
Keyword(s):  
Plastic Deformation ◽  
Surface Morphology ◽  
Sliding Wear ◽  
Adhesive Wear ◽  
Wear Behavior ◽  
Contact Wire ◽  
Sliding Direction ◽  
Black Oxide ◽  
Worn Surface

The sliding wear behavior of Cu-Ag alloy in Cu cladding Al contact wire against 45# steel or bronze block was tested, then surface morphology was investigated in different load and velocity. The results indicated that the worn surface had plastic deformation and many clear furrows and cutting traces along the sliding direction. There were black oxide of copper on the worn surface. The oxide was both abrasive and lubrication. The mechanisms transformed from abrasive attrition into adhesive wear. Spalling pits and adhesive blocks with bronze friction were significantly bigger than that of steel, and the mechanisms was adhesive wear.

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