Effects of Micro Dimple’s Topography Parameters on Wear Resistance of Laser Textured AlCrN Coating Under Starved Lubrication Condition

The active screen ion sulphurized layer was prepared on the surface of CrMoCu alloy cast iron by using active screen ion sulphurizing technology. Its key composition is FeS. Under epinoc grease lubrication condition, the friction factor and the wear volume of the active screen ion sulphurized layer is 24% and 40% lower than that of the plain surface and close to that of the sulphurized layer, respectively. The active screen ion sulphurized layer has excellent self-lubrication property, and its loose and porous structure tending to store the grease, which make it possess excellent friction reduction and wear resistance performances.

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Wear Resistance of Cu10Al5Fe5Ni Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.817.571 ◽

2015 ◽

Vol 817 ◽

pp. 571-576

Author(s):

Jun Tao Zou ◽

Chan Wang ◽

Yang Li ◽

Xian Hui Wang ◽

Shu Hua Liang

Keyword(s):

Wear Resistance ◽

Wear Rate ◽

Wear Mechanism ◽

Adhesive Wear ◽

Cast Alloy ◽

Lubricating Oil ◽

Fatigue Wear ◽

Lubrication Condition ◽

Increasing Temperature ◽

Scanning Electron

The effect of ambient temperature, materials state and lubrication condition on wear resistance of Cu10Al5Fe5Ni alloy was investigated. The wear surface morphology was characterized by a scanning electron microscope (SEM), and the wear mechanism was discussed as well. The results show that the friction coefficient of Cu10Al5Fe5Ni alloy increases and then decreases with increasing temperature. The wear rate of the Cu10Al5Fe5Ni alloy after solid solution and ageing treatment is less than that of the as-cast alloy, and the wear rate of Cu10Al5Fe5Ni alloy reduces dramatically from 5.31×10-5 mm3 / (m· N) into 1.80×10-6 mm3 / (m·N) after adding lubricating oil. At elevated temperature, the prior wear mechanism is the fatigue wear, accompanying by slight abrasive wear and adhesive wear for the aged Cu10Al5Fe5Ni alloy.

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Microstructure, tribological performances, and wear mechanisms of laser-cladded TiC-reinforced NiMo coatings under grease-lubrication condition

Materials Science-Poland ◽

10.2478/msp-2021-0032 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Zhu Weixin ◽

Kong Dejun

Keyword(s):

Wear Resistance ◽

Wear Test ◽

Depth Of Field ◽

X Ray Diffraction ◽

Grease Lubrication ◽

Wear Performance ◽

Friction Process ◽

X Ray ◽

Wear Rates ◽

Lubrication Condition

Abstract NiMo-5%TiC, NiMo-15%TiC, and NiMo-25%TiC coatings were prepared on GCr15 steel by laser cladding (LC). The microstructure and the phases of the obtained coatings were analyzed using ultra-depth-of-field microscopy (UDFM) and X-ray diffraction (XRD), respectively. A ball-on-disk wear test was used to analyze the friction-wear performance of the substrate and the NiMo-TiC coatings under grease-lubrication condition. The results show that the grain shape of NiMo-TiC coatings is dendritic. The wear resistance of NiMo-TiC coatings is improved by the addition of TiC, and the depths of the worn tracks on the substrate and on the NiMo-5%TiC, NiMo-15%TiC, and NiMo-25%TiC coatings are 4.183 μm, 2.164 μm, 1.882 μm, and 1.246 μm, respectively, and the corresponding wear rates are 72.25 μm3/s/N, 32.00 μm3/s/N, 18.10 μm3/s/N, and 7.99 μm3/s/N, respectively; this shows that the NiMo-25%TiC coating has the highest wear resistance among the three kinds of coatings. The wear mechanism of NiMo-TiC coatings is abrasive wear, and the addition of TiC plays a role in resisting wear during the friction process.

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A tribological analysis on stuffing box-piston rod system of low-speed marine diesel engines

International Journal of Engine Research ◽

10.1177/1468087418796615 ◽

2018 ◽

Vol 20 (8-9) ◽

pp. 911-930 ◽

Cited By ~ 4

Author(s):

Rui Li ◽

Xianghui Meng ◽

Youbai Xie

Keyword(s):

Film Thickness ◽

Diesel Engines ◽

Oil Film ◽

Low Speed ◽

Rod System ◽

Marine Diesel ◽

Ring Location ◽

Lubrication Condition ◽

Ring Pack ◽

Starved Lubrication

The stuffing box-piston rod system is widely used in the low-speed marine diesel engines to scrape oil and ensure sealing. Its friction power loss and wear rate are great, but the studies about the system are very limited. In this study, based on the special structure and working conditions of the stuffing box, the analytical model for the tribological properties of the stuffing box-piston rod system is developed considering the oil starvation and relative ring location effects. The minimum oil film thickness, friction, oil transportation, and asperity contact are calculated for the stuffing box. The analysis results show that compared with the fully flooded lubrication, the minimum oil film thicknesses of the rings reduce significantly in the middle of the strokes under the starved lubrication condition, but the friction losses of the rings are influenced by the comprehensive effects of the oil film thickness reduction and lubricating area reduction under the starved lubrication condition, which is related to the specific profiles of the rings. In addition, compared with the engine piston ring pack, the relative ring location effect is more obvious in the stuffing box ring pack because there are more rings and the ring intervals are larger. The relative ring location effect makes the minimum oil film thicknesses, friction forces, and asperity contacts of the rings have oscillations after bottom dead center and top dead center.

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Microstructure and Tribological Properties of Fe-Based Laser Cladding Layer on Nodular Cast Iron for Surface Remanufacturing

Coatings ◽

10.3390/coatings11080974 ◽

2021 ◽

Vol 11 (8) ◽

pp. 974

Author(s):

Dongya Zhang ◽

Zhongwei Li ◽

Hongwei Fan ◽

Hongbin Rui ◽

Feng Gao

Keyword(s):

Wear Resistance ◽

Cast Iron ◽

Tribological Properties ◽

Dry Friction ◽

Equivalent Stress ◽

Nodular Cast Iron ◽

Friction Coefficients ◽

Cladding Layer ◽

Starved Lubrication ◽

Lubrication Conditions

In this study, a cladding layer and nitriding layer were prepared on nodular cast iron, to provide guidance for remanufacturing of nodular cast iron. Their microstructure and composition and the tribological properties under dry and starved lubrication conditions were studied. Meanwhile, the contact stresses at different friction stages were simulated through the finite element method. The micro-hardness of the cladding layer and nitriding layer were 694 HV0.5 and 724.5 HV0.5, which were 4 times and 4.2 times higher than that of the substrate. For dry friction conditions, the wear resistance of the cladding layer and nitriding layer were 113.2 times and 65.5 times that of the substrate. For starved lubrication conditions, the friction coefficients of the cladding layer and nitriding layer were lower than that of the substrate. In addition, their average friction coefficients and wear resistance were gradually reduced with the increase in load. Contact simulation showed that the maximum equivalent stress gradually increased with the friction coefficient during the dry friction, and the peak value of von Mises stress on the nitriding layer was larger than that of the cladding layer, and the nitriding layer was more likely to yield and peel off.

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Preparation and Tribological Behaviors of Porous UHMWPE Using as Artificial Cartilage

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.199-200.651 ◽

2011 ◽

Vol 199-200 ◽

pp. 651-654

Author(s):

Gang Wu ◽

Chun Hua Zhao ◽

Hong Ling Qin ◽

Xin Ze Zhao

Keyword(s):

Molecular Weight ◽

Wear Resistance ◽

Electron Microscope ◽

Wear Loss ◽

Hot Press ◽

Tribological Behaviors ◽

Lubrication Condition ◽

Ultra High Molecular Weight ◽

Scanning Electron ◽

Press Molding

Porous ultra high molecular weight polyethylene (UHMWPE) materials have been developed by Hot Press molding technique in this investigation. The tribological behaviors of porous UHMWPE with different initial NaCl content were studied. The worn surfaces of UHMWPE and porous UHMWPE samples were examined using a Scanning Electron Microscope (SEM). It was found that the porous structure improved the wear resistance of porous UHMWPE with the proper initial NaCl content under water lubrication condition. The minimal wear loss was about 10.6mg in the case of the UHMWPE filled by 50% initial NaCl content, 43% less than that of pure UHMWPE sample.

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