scholarly journals Controlling Friction and Wear with Anisotropic Microstructures in MoN-Coated Surfaces

2021 ◽  
Vol 69 (4) ◽  
Author(s):  
W. Schulz ◽  
F. Köhn ◽  
D. Kolb ◽  
M. Balzer ◽  
H. Riegel ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Surface Texturing ◽  
Laser Surface Texturing ◽  
Molybdenum Nitride ◽  
Wear Particles ◽  
Main Effect ◽  
Nitride Coatings ◽  
Steel Surfaces ◽  
Coated Surfaces ◽  
Surface Microstructures

AbstractThis study considers anisotropic microstructures with typical dimensions of a few 10 µm which have been created on steel surfaces by laser surface texturing (LST). It is shown that the subsequent deposition of thin molybdenum nitride coatings by high-power impulse magnetron sputtering (HiPIMS) leads to surfaces that conserve the surface microstructures and exhibit a remarkably large resistance against mechanical wear. Tribological experiments with steel counter bodies are substantially influenced by the relative orientation of the structures and the wear track. Both friction and wear are shown to be modified by more than 30%, with the main effect being the removal of abrasion particles from the mechanical contact. Experiments with alumina counter bodies that hardly provide wear particles show that the orientation has no effect on the abrasion of the counter body. The novelty of the article lies in the combination of MoN coatings with surface texturing.

scholarly journals Controlling friction and wear with anisotropic microstructures in MoN coated surfaces

2021 ◽  
Author(s):  
Wadim Schulz ◽  
Florian Köhn ◽  
David Kolb ◽  
Martin Balzer ◽  
Harald Riegel ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Surface Texturing ◽  
Laser Surface Texturing ◽  
Molybdenum Nitride ◽  
Main Effect ◽  
Nitride Coatings ◽  
Steel Surfaces ◽  
Analogue Experiments ◽  
Coated Surfaces ◽  
Surface Microstructures

Abstract Steel surfaces have been patterned by laser surface texturing (LST) to create anisotropic microstructures with typical dimensions of a few 10 micrometers. The subsequent deposition of thin molybdenum nitride coatings by high power impulse magnetron sputtering (HiPIMS) leads to surfaces that conserve the surface microstructures and exhibit an extraordinarily large resistance against mechanical wear. Tribological experiments with steel counter bodies show a substantial influence of the relative orientation of structures and wear track on friction and wear. It is pointed out that the main effect is the removal of abrasion particles from the mechanical contact. Analogue experiments with alumina counter bodies that hardly provide wear particles show that the orientation effect is absent.

Friction and Wear of MoS2 Films on Laser Textured Steel Surfaces

2008 ◽  
Author(s):  
Lev Rapoport ◽  
Alexey Moshkovich ◽  
Vladislav Perfilyev ◽  
Igor Lapsker ◽  
Gregory Halperin ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Solid Lubricant ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Wear Life ◽  
Lubricant Films ◽  
Mos2 Film ◽  
Steel Surfaces ◽  
Solid Lubricant Films

Incorporation of solid lubricant into micro-reservoirs produced by Laser Surface Texturing (LST) and its effect on the tribological properties of surfaces under dry friction is studied. The density of the dimple reservoirs and the height of the bulges around them are investigated in terms of the longevity of solid lubricant films burnished on LST steel surfaces. Friction tests were performed using a ball-on-flat device. Optimum density (40–50%) of the dimples is revealed. It is shown that the adhesion of solid lubricant in the space between the dimples is provided by mechanical engagement of particles in the rough surface and by smearing the solid lubricant around the dimples. Best results are obtained with the surfaces that were lapped to half of the height of bulges. Long wear life of burnished film on LST steel surfaces is apparently provided by preservation of thin MoS2 film around the bulges and by supply of solid lubricant from the dimples to the surface. The effect of repeated burnishing on wear life of solid lubricant films was studied. Repeating burnishing leading to increasing the density of solid lubricant films increases the wear life.

Tribological effects of laser surface texturing and residual stress

2018 ◽  
Vol 70 (1) ◽  
pp. 126-132 ◽  
Author(s):  
Shuwen Wang ◽  
Feiyan Yan ◽  
Ao Chen
Keyword(s):  
Residual Stress ◽  
Wear Resistance ◽  
Friction And Wear ◽  
Surface Texturing ◽  
Laser Surface ◽  
Friction Reduction ◽  
Laser Surface Texturing ◽  
Wear Testing ◽  
Content Type ◽  
Surface Textures

Purpose The purpose of this paper is to investigate the tribological effects of laser surface texturing (LST) and residual stress on functional surfaces. Design/methodology/approach Three different surface textures (circular dimple, elliptical dimple and groove) with two different textured area ratios (10 and 20 per cent) are designed and fabricated by a Picosecond Nd YAG Laser machine. The friction and wear performance of textured specimens is tested using a UMT-2 friction and wear testing machine in mixed lubrication. Findings Test results show that elliptical dimples exhibit the best performance in wear resistance, circular dimples in friction reduction and grooves in stabilization of friction. The surfaces with larger textured area density exhibit better performance in both friction reduction and wear resistance. The improved performance of LST is the coupled effect of surface texture and residual stress. Originality/value The findings of this study may provide guidance for optimal design of functional surface textures in reciprocating sliding contacts under mixed or hydrodynamic lubrication, which can be used in automotive and other industrial applications.

Effectiveness of multi-shape laser surface texturing in the reduction of friction under lubrication regime

2016 ◽  
Vol 68 (1) ◽  
pp. 116-124 ◽  
Author(s):  
Dawit Zenebe Segu ◽  
Pyung Hwang
Keyword(s):  
Hydrodynamic Lubrication ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Textured Surface ◽  
Content Type ◽  
Laser Ablation Process ◽  
Specific Formula ◽  
Steel Surfaces ◽  
Lubrication Conditions

Purpose – The purpose of this paper is to investigate and discuss the effect of multi-shape laser surface texturing (LST) steel surfaces on tribological performance. Design/methodology/approach – The textured surface with some specific formula arrays was fabricated by laser ablation process by combining patterns of circles and triangles, circles and squares and circles and ellipses. The tribological test was performed by a flat-on-flat tribometer under dry and lubrication conditions, and results were compared with that of untextured surface. Findings – The results showed that the textured surface had better friction coefficient performance than the untextured surface due to hydrodynamic lubrication effect. Through an increase in sliding speed, the beneficial effect of LST performance was achieved under dry and lubrication conditions. Originality/value – This paper develops multi-shape LST steel surfaces for improving the friction and wear performance under dry and lubrication conditions.

Friction and Wear of MoS2 Films on Etched Steel Surfaces

2008 ◽  
Author(s):  
V. Perfilyev ◽  
A. Moshkovich ◽  
K. Lutudjean ◽  
L. Rapoport
Keyword(s):  
Chemical Treatment ◽  
Friction And Wear ◽  
Steel Surface ◽  
Solid Lubricant ◽  
Surface Texturing ◽  
Roughness Parameters ◽  
Wear Properties ◽  
Wear Life ◽  
Steel Surfaces ◽  
Friction And Wear Properties

Surface texturing is one of modern technologies using for improvement friction and wear properties of rubbed surfaces. The simple and effective methods of surface texturing are mechanical or chemical treatments of friction surfaces. In this work we deal with chemical treatment of steel surfaces with following filling the profile by solid lubricant particles as MoS2. The steel surfaces were etched with phosphoric acid. The effect of time and temperature of etching on the surface roughness parameters was studied. Some standard roughness parameters of etched surface were measured. It was found that the parameters of roughness as Rz and Sm characterizing the depth of valleys and their size can be used for description of etched surfaces. Optimal parameters, Rz and Sm, providing the best tribological properties were determined: Rz = 5 ∼ 7 m and Sm = 50–70 m. The thickness of solid lubricant film was about 1 m. Finally, the tribological properties of MoS2 films on the steel surfaces textured by chemical treatment were performed. The friction coefficient and wear life of solid lubricant films was assessed. Friction and wear properties of MoS2 films on etched surfaces were compared with similar films on virgin steel surface. The wear life of MoS2 films on etched surfaces was 5–7 times larger than for solid lubricant film on mechanically treated steel surface.

scholarly journals Effect of laser surface texturing (LST) on tribochemical films dynamics and friction and wear performance

Wear ◽  
2015 ◽  
Vol 332-333 ◽  
pp. 1225-1230 ◽  
Author(s):  
Bolutife Olofinjana ◽  
Cinta Lorenzo-Martin ◽  
Oyelayo O. Ajayi ◽  
Ezekiel O. Ajayi
Keyword(s):  
Friction And Wear ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Wear Performance ◽  
Tribochemical Films
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