Investigation on adhesive wear process of tool coating surface under high-adhesive rate environment in cutting Beryllium-copper C17200 alloy

2020 ◽  
Vol 279 ◽  
pp. 128488
Author(s):  
Junyan Zuo ◽  
Youxi Lin ◽  
Ping Zhong ◽  
Yi Liu
Keyword(s):  
Adhesive Wear ◽  
Wear Process ◽  
Beryllium Copper ◽  
Coating Surface ◽  
Tool Coating ◽  
Rate Environment

SCUFFING WEAR OF THE TRIBOLOGICAL PAIRS UNDER OSCILLATORY MOTION

Tribologia ◽  
2016 ◽  
Vol 269 (5) ◽  
pp. 31-40 ◽  
Author(s):  
Stanisław GUZOWSKI ◽  
Grzegorz ZAJĄC ◽  
Grzegorz KACZOR
Keyword(s):  
High Probability ◽  
Adhesive Wear ◽  
Oscillatory Motion ◽  
Test Machine ◽  
Line Contact ◽  
Wear Process

The surfaces of the friction pairs in oscillatory motion are exposed to the complex wear processes. Scuffing is a specific wear process, which comprises abrasive and adhesive wear. This paper presents the results of the preliminary scuffing tests, conducted on the T-05 test machine under oscillatory motion in the line contact. The results obtained from the tests confirmed the high probability of the scuffing occurrence under the assumed tests conditions. This is the basis for the planning of further research in this area.

Tribological Properties of Mo/NiCrBSi Thermal Spray Deposits

1998 ◽  
Author(s):  
V. Fervel ◽  
B. Normand ◽  
C. Coddet ◽  
M. Delaet
Keyword(s):  
Cast Iron ◽  
Adhesive Wear ◽  
Tribological Behavior ◽  
Optical Microscope ◽  
Atmospheric Plasma ◽  
Wear Process ◽  
Dry Conditions ◽  
Nicrbsi Coating ◽  
The Difference ◽  
Nicrbsi Coatings

Abstract The tribological behavior of Mo/NiCrBSi coatings obtained by atmospheric plasma spray was studied under dry conditions using an Amsler machine. Discussion is made on the effects of the plasma gas mixture and of the preheating of the substrate. The wear process of Mo/NiCrBSi in situation of dry rolling-sliding contact versus cast iron was observed using a profilometer, an optical microscope, and a scanning electron microscope. It was found that the wear mechanism could be divided into two steps : the first one corresponds to an abrasive wear; it results from the difference in hardness between the counter-specimen and the Mo/NiCrBSi coating. The second one corresponds to an adhesive wear resulting from the transfer of cast iron from the counter-specimen to the coating.

scholarly journals A FRACTURE-INDUCED ADHESIVE WEAR CRITERION AND ITS APPLICATION TO THE SIMULATION OF WEAR PROCESS OF THE POINT CONTACTS UNDER MIXED LUBRICATION CONDITION

2021 ◽  
Vol 19 (1) ◽  
pp. 023
Author(s):  
Hui Cao ◽  
Yu Tian ◽  
Yonggang Meng
Keyword(s):  
Adhesive Wear ◽  
Wear Particle ◽  
Rolling Motion ◽  
Morphology Evolution ◽  
Point Contacts ◽  
Wear Process ◽  
Subsurface Layers ◽  
Lubrication Condition ◽  
Simulation Results ◽  
Almost All

Adhesive wear is one of the four major wear mechanisms and very common in almost all macro-, micro- or nanotribosystems. In an adhesive wear process, tiny material fragments are pulled off from one sliding surface and adhered onto the counterpart. Later these fragments form loose particles or transfer between the contact surfaces. Because of the topographical and physicochemical property non-uniformity of engineering surfaces, adhesive wear happens heterogeneously on the loaded sliding surfaces, and it is also discontinuous during sliding or rolling motion owing to the damage accumulation and fracture occurred inside the subsurface layers. Taking account of these characteristics, a novel fracture-induced adhesive wear criterion has been proposed in this study in order to predict local wear of material in sliding. Moreover, the proposed wear criterion is applied to predicting wear particle formation and morphology evolution of mixed lubricated rough surfaces during reciprocating sliding, and the simulation results are compared with the ball-on-disk experimental measurements.

scholarly journals Friction and adhesive wear behavior caused by periodic impact in mixed-lubricated point contacts

2020 ◽  
Vol 12 (2) ◽  
pp. 168781402090166
Author(s):  
Xin Pei ◽  
Wei Pu ◽  
Jialong Yang ◽  
Ying Zhang
Keyword(s):  
Friction Coefficient ◽  
Adhesive Wear ◽  
Wear Behavior ◽  
Critical Role ◽  
Surface Velocity ◽  
Asperity Contact ◽  
Impact Action ◽  
Wear Process ◽  
Lubrication Condition ◽  
Functional Components

Periodic impact is a common phenomenon experienced by functional components. The mechanisms governing the adhesive wear growth caused by the periodic impact are not well understood, which limits the development of antiwear and lubricating behavior. In this work, the periodic impact action caused by rubbing surface velocity and contact load is studied in the sliding wear process under mixed lubrication condition. At each wear simulation circle, the material removal at each asperity contact location is evaluated and the surface topography is renewed correspondingly. The evolutions of friction and wear track are revealed during wear process. We find that the friction coefficient changes periodically caused by the periodic speed, and the wear rate increases almost linearly with either speed period or speed amplitude. The load impact results in an abrupt variation in friction coefficient, while it appears to be limited in adhesive wear state compared to speed, highlighting the critical role of velocity impact in wear formation.

Research on Tribological Properties and Viscoelasticity of EPDM Rubber in the Main Drive Sealing System of Shield Machine

2021 ◽  
pp. 1-9
Author(s):  
Qi Sun ◽  
Shijie Wang ◽  
Xiaoren Lv
Keyword(s):  
Carbon Black ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Adhesive Wear ◽  
Carbon Black Content ◽  
Stick Slip ◽  
Wear Process ◽  
New Compounds ◽  
Shield Machine ◽  
The Relationship

Abstract The tribological properties and wear mechanisms of EPDM with different carbon black contents under dry friction conditions are studied on an UMT Tribolab friction and wear tester. The variation of carbon black content in EPDM does not lead to the formation of new compounds. However, it significantly improves the shore hardness and tribological properties of EPDM. In addition, significant stick-slip phenomenon occurs during the wear process of EPDM with different carbon black content. During the wear process of EPDM, there are both adhesive wear and abrasive wear, and adhesive wear is the main wear form. Therefore, the results reveal the relationship between carbon black content and tribological properties of EPDM, which can contribute to improve the tribological properties of EPDM.

Friction and wear performance of a copper-based bond emery wheel for rail grinding

2020 ◽  
Vol 62 (12) ◽  
pp. 1205-1214
Author(s):  
Lu-cheng Cai ◽  
Xiao-song Jiang ◽  
Yu-cheng Guo ◽  
Da-ming Sun ◽  
Xing-long Wang ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Adhesive Wear ◽  
Grinding Wheel ◽  
Wear Performance ◽  
Wear Process ◽  
Delamination Wear ◽  
Grinding Performance ◽  
Rail Grinding ◽  
Hot Pressing Sintering ◽  
Oxidation Wear

Abstract In this paper, a copper-based bond emery wheel was prepared by vacuum hot pressing sintering through powder metallurgy. The effects of various bond contents on the grinding performance of the copperbased bond grinding wheel were studied using a self-made experimental device; the friction coefficients between the friction pairs and roughness of the grinded rail surface were also obtained. The results show that the grinding wheel had the best grinding performance when the content of the copper-based bond was at 35 wt.-%, the friction coefficient 0.29, the grinding ratio 81.34, and the surface roughness 7.191 μm, which meet the roughness requirements of rail grinding. The microstructure of the rail surface and debris after grinding were studied by scanning electron microscope and energy spectrum analysis. Adhesive wear, abrasive wear, oxidation wear and delamination wear occurred during the friction and wear process. The grinding behavior of grinding wheels was analyzed in accordance with the experimental results.

Influence of electric brush‐plating voltage on hydrophobic behaviour of a cauliflower‐like Ni coating surface

2018 ◽  
Vol 13 (8) ◽  
pp. 1159-1164
Author(s):  
Jing Li ◽  
Fengyu Fan ◽  
Qiang Li ◽  
Feng Du ◽  
Huadong Yu
Keyword(s):  
Coating Surface ◽  
Brush Plating

Flexographic ink-coating interactions: effects of latex variations in coating layers

TAPPI Journal ◽  
2016 ◽  
Vol 15 (4) ◽  
pp. 253-262 ◽  
Author(s):  
ERIK BOHLIN ◽  
CAISA JOHANNSON ◽  
MAGNUS LESTELIUS
Keyword(s):  
Contact Angles ◽  
High Ratio ◽  
Print Quality ◽  
Particle Sizes ◽  
Mixed Composition ◽  
Coating Surface ◽  
Covered Area ◽  
Surface Optical ◽  
Flexographic Printing ◽  
Coating Formulation

The effect of coating structure variations on flexographic print quality was studied using pilot-coated paperboard samples with different latex content and latex particle sizes. Two latexes, with particle sizes of 120 nm and 160 nm, were added at either 12 parts per hundred (pph) or 18 pph to the coating formulation. The samples were printed with full tone areas at print forces of 25 N and 50 N in a laboratory flexographic printing press using a waterbased ink. A high ratio of uncovered areas (UCAs) could be detected for the samples that contained 18 pph latex printed at a print force of 25 N. UCAs decreased with increased print force and with decreased amounts of latex in the coating formulation. The fraction of latex covered area on the coating surface was estimated to be 0.35–0.40 for the 12 pph, and 0.70–0.75 for the 18 pph samples. The ink penetration depth into the coating layer could be linked to the fraction of latex-free areas on the coating surface. Optical cross section microscopy indicated that a higher printing force did not increase the depth of penetrated ink to any greater extent. Higher printing force did increase contact between plate and substrate, leading to an improved distribution of the ink. This, in turn, increased print density and decreased UCAs. On closer inspection, the UCAs could be categorized as being induced by steep topographic changes. When appearing at other locations, they were more likely to be caused by poor wetting of the surface. To understand the wetting behavior of the coating surface, observed contact angles were compared with calculated contact angles on surfaces of mixed composition.

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