A study of the role of solid lubricant and fibrous reinforcement in modifying the wear performance of polyethersulphone

Some solid lubricants are characterized by a layered structure with weak (van der Waals) inter-interlayer forces which allow for easy, low-strength shearing. Solid lubricants in natural lubrication are characterized by phospholipid bilayers in the articular joints and phospholipid lamellar phases in synovial fluid. The influence of the acid–base properties of the phospholipid bilayer on the wettability and properties of the surface have been explained by studying the interfacial tension of spherical lipid bilayers based on a model membrane. In this paper, we show that the phospholipid multi-bilayer can act as an effective solid lubricant in every aspect, ranging from a ‘corrosion inhibitor’ in the stomach to a load-bearing lubricant in bovine joints. We present evidence of the outstanding performance of phospholipids and argue that this is due to their chemical inertness and hydrophilic–hydrophobic structure, which makes them amphoteric and provides them with the ability to form lamellar structures that can facilitate functional sliding. Moreover, the friction coefficient can significantly change for a given phospholipid bilayer so it leads to a lamellar-repulsive mechanism under highly charged conditions. After this, it is quickly transformed to result in stable low-friction conditions.

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Wear Resistance Research of Advanced High Strength Steels

Materials Science Forum ◽

10.4028/www.scientific.net/msf.850.197 ◽

2016 ◽

Vol 850 ◽

pp. 197-201

Author(s):

Chao Zhi ◽

Yi Fei Gong ◽

Ai Min Zhao ◽

Jian Guo He ◽

Ran Ding

Keyword(s):

Wear Resistance ◽

Twip Steel ◽

High Strength Steels ◽

High Strength ◽

Wear Performance ◽

Dp Steel ◽

Advanced High Strength Steels ◽

Wear Mode ◽

Surface Phase Transformation

The wear performance and wear mechanism under two-body abrasion of five advanced high strength steels, i.e. Nanobainite (NB) steel, Tempered Martensitic (TM) steel, Dual Phase (DP) steel, Transformation Induced Plasticity (TRIP) Steel and Twining Induced Plasticity (TWIP) steel were studied. By using the scanning electron microscopy (SEM), we investigated the wearing surface. Phase transformation strengthening behavior was also be discussed by analyzing the surface and sub-surface after abrasion. The results showed that micro-cutting was the major role of wear mode in the condition of two-body abrasion. In the circumstance of two-body abrasion, hardness was an important factor, the property of wear resistance enhanced while the hardness increased except for TM steel. NB steel possessed the best wear resistance which was 1.71 times higher than that of TWIP steel. The retained austenite transformed into martensite which can improve the hardness so that it enhanced the wear resistance of NB steel.

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The Role of HBN Solid Lubricant Reducing Cutting Forces of Dry Machined Al-B4C Composite

Lecture Notes on Multidisciplinary Industrial Engineering - Advances in Unconventional Machining and Composites ◽

10.1007/978-981-32-9471-4_58 ◽

2019 ◽

pp. 697-705 ◽

Cited By ~ 1

Author(s):

M. Rajesh ◽

K. Rajkumar ◽

A. Gnanavelbabu ◽

K. M. Nambiraj

Keyword(s):

Cutting Forces ◽

Solid Lubricant

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Improved Wear Performance by the Incorporation of Solid Lubricants During Thermal Spraying

Thermal Spray 2000: Proceedings from the International Thermal Spray Conference ◽

10.31399/asm.cp.itsc2000p0909 ◽

2000 ◽

Author(s):

B.R. Marple ◽

J. Voyer

Keyword(s):

Sliding Wear ◽

Solid Lubricant ◽

Thermal Spraying ◽

Solid Lubricants ◽

Degradation Process ◽

Tribological Performance ◽

Optimum Level ◽

Wear Performance ◽

Wear Tests ◽

Minimum Wear

Abstract For components that are required to function in sliding or rubbing contact with other parts, degradation often occurs through wear due to friction between the two contacting surfaces. Depending on the nature of the materials being used, the addition of water as a lubricant may introduce corrosion and accelerate the degradation process. To improve the performance and increase the life of these components, coatings may be applied to the regions subject to the greatest wear. These coatings may be engineered to provide internal pockets of solid lubricant in order to improve the tribological performance. In the present study, coatings containing a solid lubricant were produced by thermal spraying feedstock powders consisting of a blend of tungsten carbide-metal and a fluorinated ethylene-propylene copolymer-based material. The volume content of this Teflon-based material in the feedstock ranged from 3.5 to 36%. These feedstocks were deposited using a high velocity oxy-fuel system to produce coatings having a level of porosity below 2%. Sliding wear tests in which coated rotors were tested in contact with stationary carbon-graphite disks identified an optimum level of Teflon-based material in the feedstock formulation required to produce coatings exhibiting minimum wear. This optimum level was in the range of 7-17% by volume and depended on the composition of the cermet constituent. Reductions in mass loss for the couples on the order of 50% (an improvement in performance by a factor of approximately two) were obtained for the best-performing compositions, as compared to couples m which the coating contained no solid lubricant.

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Role of Al2O3 in Semi-Metallic Friction Materials and its Effects on Friction and Wear Performance

Tribology Transactions ◽

10.1080/10402000802011760 ◽

2008 ◽

Vol 51 (6) ◽

pp. 771-778 ◽

Cited By ~ 11

Author(s):

Yanli Fan ◽

Vlastimil Matějka ◽

Gabriela Kratošová ◽

Yafei Lu

Keyword(s):

Friction And Wear ◽

Wear Performance ◽

Friction Materials ◽

Metallic Friction

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The Role of Distribution Forms of Fe–Cr–C Cladding Layer in the Impact Abrasive Wear Performance of Hadfield Steel

Materials ◽

10.3390/ma13081818 ◽

2020 ◽

Vol 13 (8) ◽

pp. 1818

Author(s):

Zhang Pan ◽

Xuanpu Dong ◽

Huatang Cao ◽

Qiwen Huang

Keyword(s):

Wear Resistance ◽

Abrasive Wear ◽

Abrasive Wear Resistance ◽

Hadfield Steel ◽

Wear Performance ◽

Cladding Layer ◽

Glass Sand ◽

The Impact ◽

Cladding Layers

To investigate the role of different distribution forms of Fe–Cr–C cladding layer in the impact abrasive wear performance of Hadfield steel, the over-lapped Fe–Cr–C cladding layer and dot-shaped Fe–Cr–C cladding layer were deposited, respectively, by plasma transferred arc (PTA) cladding on Hadfield steel. The microstructure, microhardness and impact abrasive wear performance of the two cladding layers under the impact of glass sand, granite and quartz sand were investigated. The results showed that both microstructures of the cladding layers were hypoeutectic Fe–Cr–C microstructures. The average microhardness of the over-lapped cladding layer and dot-shaped cladding layer was around 560 HV0.2 and 750 HV0.2, respectively. The over-lapped Fe–Cr–C cladding layer could only improve the impact abrasive wear resistance of the Hadfield steel under the wear condition of the glass sand. Meanwhile, the dot-shaped Fe–Cr–C cladding layer could improve the impact abrasive wear resistance of the Hadfield steel under all the three kinds of the abrasives because of the overall strengthening effect of its convex shape and the hypoeutectic FeCrC microstructure.

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