scholarly journals Tribological Properties of Laser Microtextured Surface Bonded With Composite Solid Lubricant at High Temperature

2016 ◽  
Vol 138 (3) ◽  
Author(s):  
Xijun Hua ◽  
Jianguo Sun ◽  
Peiyun Zhang ◽  
Kai Liu ◽  
Rong Wang ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Smooth Surface ◽  
Solid Lubricant ◽  
Sliding Friction ◽  
Synergetic Effect ◽  
Laser Surface Texturing ◽  
Solid Lubrication ◽  
Textured Surface ◽  
Friction Coefficients ◽  
Composite Solid

A combination technology of the solid lubricant and the laser surface texturing (LST) can significantly improve the tribological properties of friction pairs. The plate sample was textured by fiber laser and composite lubricant of polyimide (PI) and molybdenum disulfide (MoS2) powders were filled in the microdimples. Sliding friction performances of micron-sized composite lubricant and nano-sized composite lubricant were investigated by ring-plate tribometer at temperatures ranging from room temperature (RT) to 400 °C. On the one hand, the results of the micron-sized composite lubricant show that the friction coefficient of the textured surface filled with composite lubricant (TS) exhibits the lowest level and the highest stability compared to a textured surface without solid lubrication, smooth surface without lubrication, smooth surface burnished with a layer of composite solid lubricant. The better dimple density range is 35–46%. The friction coefficients of the sample surface filled with micron-composite solid lubricant with the texture density of 35% are maintained at a low level (about 0.1) at temperatures ranging from RT to 300 °C. On the other hand, the results of the nano-sized composite lubricant show that these friction properties are better than those of MoS2-PI micron-sized composite. The friction coefficients of MoS2-PI-CNTs nano-sized composite solid lubricant are lower than those of the MoS2-PI composite lubricant at temperatures ranging from RT to 400 °C. In addition, the possible mechanisms involving the synergetic effect of the surface texture and the solid lubricant are discussed in the present work.

Solid Lubrication with Carbon Onions at High Temperature in Vacuum

2008 ◽  
Vol 1085 ◽  
Author(s):  
Atsushi Hirata ◽  
Shinji Saito
Keyword(s):  
Solid Lubricant ◽  
Spectroscopic Analysis ◽  
Sliding Friction ◽  
Solid Lubrication ◽  
Friction Coefficients ◽  
Raman Spectroscopic ◽  
Friction Testing ◽  
Carbon Onions ◽  
Stainless Steel Ball ◽  
Raman Spectroscopic Analysis

ABSTRACTSolid lubricant properties of carbon onions prepared from diamond nanoparticles through a heat treatment at 1700°C have been examined at high temperatures up to 300°C in air and vacuum. Sliding friction between a silicon disk on which carbon onions were dispersed and a stainless steel ball was measured by means of ball-on-disk type friction testing. Friction coefficients in vacuum decreased with temperatures and became stable above 100°C for longer service lives. On the contrary to this, friction coefficients in air increased with temperatures despite Raman spectroscopic analysis showed that the structure of carbon onions were stable in dry air up to 300°C.

Vacuum tribological properties of a composite Mo–MoS2film after atomic oxygen exposure irradiation

2019 ◽  
Vol 233 (8) ◽  
pp. 1236-1244
Author(s):  
Guo-zheng Ma ◽  
Peng-fei He ◽  
Yi-wen Wang ◽  
Shu-ying Chen ◽  
Ming Liu ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Photoelectron Spectroscopy ◽  
Atomic Oxygen ◽  
Sliding Friction ◽  
Film Surface ◽  
Superficial Layer ◽  
Solid Lubrication ◽  
X Ray ◽  
Nanomechanical Properties ◽  
Lubrication Film

A composite Mo–MoS2solid-lubrication film measuring approximately 2-µm thick was prepared using a two-step composite process involving magnetron sputtering of Mo film followed by low-temperature ion sulfurization. Microstructure of the said film was characterized using scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, Auger electron spectroscopy, and X-ray photoelectron spectroscopy, and nanomechanical properties of the Mo and Mo–MoS2film were tested using a nanoindenter. The Mo–MoS2film and GCr15 substrate were irradiated by atomic oxygen with the self-developed MSTS-1 space tribometer system equipped with an atomic oxygen beam at a flux of 9 × 1019atoms/cm2. Subsequently, vacuum tribological properties of the said substrate and film were examined and compared. Results demonstrated that the Mo film possessed a smooth and dense structure with stable nanomechanical properties. Part of the elemental Mo translated into MoS2post sulfurizing, thereby forming the Mo–MoS2composite film with an alternating soft and hard structure. The Mo–MoS2film demonstrated a low and stable friction coefficient of approximately 0.15 along with only a slight wear in vacuum. The film surface could be oxidized and eroded when exposed to the highly active and energetic atomic oxygen. Post atomic oxygen erosion, the film thickness demonstrated a decrease, and small amounts of MoO3were observed on the surface. However, all structural and property changes were limited to the superficial layer. The excellent tribological performance of the film could be restored when the surface layer was removed after a certain period of sliding friction.

Study on tribological properties of surface concave convex micro-texture on the mold steel

2020 ◽  
Vol 72 (10) ◽  
pp. 1167-1171
Author(s):  
Xiping Yang ◽  
Yonghong Fu ◽  
Jinghu Ji ◽  
Tianyang Chen ◽  
Caiyun Pan
Keyword(s):  
Peer Review ◽  
Tribological Properties ◽  
Smooth Surface ◽  
Reference Sample ◽  
Density Ratio ◽  
Mold Surface ◽  
Texture Surface ◽  
Friction Coefficients ◽  
Area Density ◽  
Content Type

Purpose The purpose of this paper is to describe the tribological characteristics with different area density of concave-convex micro-texture on the mold surface. It is a new technology to improve the quality of the workpiece to control the tribological properties through the application of concave-convex micro-texture on the mold surface. Design/methodology/approach Five groups of laser micro-texture with different area density (ratio of the concave-convex micro-texture area to the all-area) were processed on the surface of the mold steel, and the tribological properties were compared with the smooth surface of the reference sample. Findings The time of the running-in stage in different experimental groups was about 300 s. The fluctuation amplitude of concave-convex micro-texture friction coefficient is much larger than that of smooth plane specimen in the running-in stage. After the running-in stage, the friction coefficients were lower than that in the smooth condition and decreased with the increase of the concave-convex micro-texture area density. When the area density reached 25%, the friction coefficients no longer decreased significantly. In addition, the wear of concave-convex micro-texture surface is much lower than that of smooth surface and decreases with the increase of concave-convex micro-texture area density. Originality/value Domestic and foreign scholars have done a lot of research on the relationship between concave micro-texture and tribological properties. However, the object of this paper is a new concave-convex micro-texture, which is rarely studied in the field of tribology. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-03-2020-0081/

Effect of n-Na2B4O7 Additive on Tribological Performances of Ion Nitrocarburized Layer

2015 ◽  
Vol 1120-1121 ◽  
pp. 254-259
Author(s):  
Chun Hua Hu ◽  
Hai Jiang ◽  
Yun Feng Du ◽  
Hai Peng Wang ◽  
Zhi Chang Deng
Keyword(s):  
Wear Resistance ◽  
Friction Surface ◽  
Sliding Friction ◽  
Synergetic Effect ◽  
Rolling Friction ◽  
Friction Reduction ◽  
Solid Lubrication ◽  
Higher Temperature ◽  
Different Content ◽  
Nitrocarburized Layer

The paper studied the effect of n-Na2B4O7additives of different content on tribological performances of the ion nitrocarburized layer. It is found that 7% n-Na2B4O7additive can improve greatly the friction reduction and wear resistance of the ion nitrocarburized layer under different conditions. This because that synergetic effect of friction reduction and wear resistance is produced between n-Na2B4O7additive and ion nitrocarburized layer under higher temperature, frequence and load, and the chemical reaction films including oxide, nitride, BN, and sulphide and so on formed on the friction surface play the solid lubrication function, and the n-Na2B4O7particles on the friction surface play the "Micron nanobearing" function, translating the sliding friction into the rolling friction, which can make the ion nitrocarburized layer possess the excellent tribological performances.

Comparisons of tribological properties between laser and drilled dimple textured surfaces of medium carbon steel

2017 ◽  
Vol 69 (4) ◽  
pp. 516-526 ◽  
Author(s):  
Chenchun Shi ◽  
Aibing Yu ◽  
Jianzhao Wu ◽  
Weiyang Niu ◽  
Yanlin Wang
Keyword(s):  
Tribological Properties ◽  
Wear Debris ◽  
Surface Texturing ◽  
Laser Surface Texturing ◽  
Heat Affect Zone ◽  
Textured Surface ◽  
Textured Surfaces ◽  
Wear Properties ◽  
Content Type ◽  
Worn Surfaces

Purpose The study aims to compare tribological properties between laser dimple textured surface and drilled dimple textured surface, and to analyze the influence of dimple hardened edges and ability of trapping wear debris on wear properties of dimple textured surfaces. Design/methodology/approach Circular textured dimples were produced on AISI 1,045 specimen surfaces using laser surface texturing (LST) and drilled surface texturing (DST) methods. Tribological behaviors of LST, DST and non-textured specimens were studied using ball-on-disc tribo-tester. Metallographic structures, dimples and worn surface morphologies were observed using a three-dimensional digital microscope. Hardnesses of substrate and dimple edges were measured. Findings There was no obvious difference in wear and friction coefficients between LST and DST specimens. Hardnesses of laser dimple edges were much higher than that of drilled dimple edges and specimen substrate. The hardened materials of laser dimple edge included recast zone and heat affect zone. Laser dimple was cone-shaped and drilled dimple was cylinder-shaped. Drilled dimple had a better ability of trapping wear debris than laser dimple. Non-uniform wear phenomenon occurred on worn surfaces of LST dimple specimens. Originality/value The ability of textured dimples to trap wear debris is affected by single dimple volume. Hardened edges of dimples cause non-uniform wear on worn surfaces of LST specimens.

scholarly journals Polydopamine-Assisted Immobilization of Chitosan Brushes on a Textured CoCrMo Alloy to Improve its Tribology and Biocompatibility

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3014 ◽  
Author(s):  
Liguo Qin ◽  
Hongjiang Sun ◽  
Mahshid Hafezi ◽  
Yali Zhang
Keyword(s):  
Tribological Properties ◽  
Photoelectron Spectroscopy ◽  
Polymer Brushes ◽  
Hydrodynamic Lubrication ◽  
Synergistic Effects ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Textured Surface ◽  
Osteoblast Cells

Due to their bioinert and reliable tribological performance, cobalt chromium molybdenum (CoCrMo) alloys have been widely used for articular joint implant applications. However, friction and wear issues are still the main reasons for the failure of implants. As a result, the improvement of the tribological properties and biocompatibility of these alloys is still needed. Thus, surface modification is of great interest for implant manufacturers and for clinical applications. In this study, a strategy combining laser surface texturing and chitosan grafting (mussel inspired) was used to improve the tribological and biocompatible behaviors of CoCrMo. The microstructure and chemical composition were investigated by atomic force microscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy, respectively. The tribological properties were discussed to determine their synergistic effects. To evaluate their biocompatibility, osteoblast cells were cocultured with the modified surface. The results show that there is a distinct synergistic effect between laser surface texturing and polymer brushes for improving tribological behaviors and biocompatibility. The prepared chitosan brushes on a textured surface are a strong mechanism for reducing friction force. The dimples took part in the hydrodynamic lubrication and acted as the container for replenishing the consumed lubricants. These brushes also promote the formation of a local lubricating film. The wear resistance of the chitosan brushes was immensely improved. Further, the worn process was observed, and the mechanism of destruction was demonstrated. Co-culturing with osteoblast cells showed that the texture and grafting have potential applications in enhancing the differentiation and orientation of osteoblast cells.

Experimental Analysis of Friction and Wear of Laser Microtextured Surface Filled With Composite Solid Lubricant and Lubricated With Grease on Sliding Surfaces

2017 ◽  
Vol 139 (2) ◽  
Author(s):  
Xijun Hua ◽  
Julius Caesar Puoza ◽  
Jianguo Sun ◽  
Peiyun Zhang ◽  
Jinghu Ji ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Solid Lubricant ◽  
Bearing Steel ◽  
Textured Surface ◽  
Plain Bearing ◽  
Textured Surfaces ◽  
Gcr15 Bearing Steel ◽  
Steel Material ◽  
Working Performance ◽  
Composite Solid

Experimental studies of friction and wear on textured surfaces filled with composite solid lubricant and lubricated with grease were conducted on a sliding plain bearing to enhance the working performance and lifetime under different conditions. Circular microdimples of different diameters were fabricated on GCr15 bearing steel specimens using the semiconductor sound and light pumped Nd:YAG laser machining equipment. Ring-on-ring tribological test configuration with GCr15 tribopairs under a combined non-Newtonian lubrication of grease and composite lubricant was performed. The results showed that the surface textures on specimen GCr15 bearing steel material filled composite solid lubricant and lubricated with grease (TLG), reduced the friction by 27%, 46%, and 75% of the grease only (TG), solid lubricant only (TL), and nonlubricated (T) specimens, respectively. The textured specimen with dimple diameter of 109 μm lowered the maximum coefficient of friction by 38% and enhanced the antiwear properties of GCr15 bearing steel material remarkably. This indicated that grease has great potential in promoting service life and working performance of sliding plain bearing when combined with composite solid lubricant in a laser-textured surface. It is therefore beneficial for applications in the machinery and automotive components industries in saving energy and reducing CO2 emission.

Tribological performance of multi-scale micro-textured H62 brass surface fabricated by micro-milling and wet micro-blasting

2021 ◽  
pp. 1-24
Author(s):  
Luanxia Chen ◽  
Zhanqiang Liu ◽  
Yukui Cai ◽  
Bing Wang
Keyword(s):  
Surface Topography ◽  
Tribological Properties ◽  
Sliding Friction ◽  
Tribological Performance ◽  
Valve Plate ◽  
Micro Milling ◽  
Cylinder Block ◽  
Textured Surface ◽  
Textured Surfaces ◽  
Multi Scale

Abstract The cylinder block/valve plate interface in the axial piston pump has been proven to be easily worn out, which will increase power loss and reduce its efficiency. The valve plate surface is required to be manufactured with low viscous friction and wear. Multi-scale micro-texture has been proven to improve surface tribological properties. However, there are few types of research in the effect of surface topography on the tribological performance of multi-scale micro-textured surfaces. The purpose of this study is to explore how the multi-scale micro-texture on H62 brass affects its sliding friction behavior on 38CrMoAl. Based on micro-milling and wet micro-blasting, the multi-scale micro-textured surface was manufactured on H62 brass. The wet micro-blasting was applied in the H62 brass after the surface micro-texturing. The surface topography of multi-scale micro-textured samples processed by three abrasive grit sizes accompanied by two processing times was comprehensively measured in terms of height, feature, functional, and functional volume parameters. The tribological performance of multi-scale micro-textured H62 brass was characterized by disk-on-disk frictional experiments. Through analyzing the relationship between surface morphology and tribological properties, the anti-friction mechanism of the multi-scale micro-textured surface was analyzed from the perspective of 3D surface roughness parameters. The friction coefficient of the multi-scale micro-textured surface processed by the combination of micro-milling and wet micro-blasting decreased with the increasing grit size and micro-blasting time.

Study on the tribological properties of titanium alloys sliding against WC-Co during the dry friction

2014 ◽  
Vol 66 (2) ◽  
pp. 202-208 ◽  
Author(s):  
Qiulin Niu ◽  
Xiaohu Zheng ◽  
Ming Chen ◽  
Weiwei Ming
Keyword(s):  
Titanium Alloy ◽  
Friction Coefficient ◽  
Tungsten Carbide ◽  
Titanium Alloys ◽  
Tribological Properties ◽  
Dry Friction ◽  
Sliding Friction ◽  
Friction Coefficients ◽  
Friction Forces ◽  
Content Type

Purpose – Titanium alloy has the excellent performance and been widely utilized in aeroengine and airframe manufacture. However, improving the understanding of all aspects of titanium alloy is necessary. The purpose of this paper is to investigate the tribological properties of two typical titanium alloys against tungsten carbide under dry friction. Design/methodology/approach – Reciprocating ball-disc friction tests were carried out at room temperature in different loading without lubricant to investigate the friction properties of TA19/WC-Co and TC18/WC-Co friction pairs. The influence of the load on the friction coefficient and friction force was analyzed. The worn surfaces of TA19 and TC18 specimens were observed by the digital microscopy and scanning electron microscopy (SEM). And the wear mechanism was discussed. Findings – The results show that the friction coefficients decreased with the increase in the normal load. However, the reduction in the friction coefficient for the TC18 alloy was less than that for the TA19 alloy. The dynamic friction forces with time were not quite coincident with the variation trend of the friction coefficients during the sliding friction. The results observed by the SEM and EDS revealed that several grooving were the main type of frictional wear causing the surfaces of the TA19 and TC18 alloys. Originality/value – It is shown in the paper that the tribological property of TA19 alloy was better than that of TC18 when sliding against tungsten carbide under the dry friction conditions. The main types of damage to the TA19/WC-Co friction pair were the ploughing, the delamination fatigue associate with abrasive wear and some diffusive wear. The ploughing and abrasion were the main wear mechanisms for the surface of TC18 alloy.

Tribological performance and self-lubricating mechanism of the laser-textured surface filled with solid lubricant in rolling friction pair

2018 ◽  
Vol 70 (2) ◽  
pp. 371-384 ◽  
Author(s):  
Xijun Hua ◽  
Xuan Xie ◽  
Bifeng Yin ◽  
Peiyun Zhang ◽  
Jinghu Ji ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Solid Lubricant ◽  
Friction Pair ◽  
Rolling Friction ◽  
Textured Surface ◽  
Textured Surfaces ◽  
Content Type ◽  
Texture Density ◽  
Composite Solid ◽  
Lubricating Mechanism

Purpose This paper aims to find out the tribological performance and self-lubricating mechanism of the laser-textured surface filled with solid lubricant in rolling friction pair. Design/methodology/approach The textures on the surfaces of GCr15 bearing steel were produced by acousto-optic Q diode-pumped yttrium aluminum garnet laser with the technology of “single pulse one time, repeating at intervals” and filled with composite solid lubricant. The tribology tests were conducted on the MMW-1A universal friction and wear testing machine. Findings It was found that the solid-lubricated micro-textured surface can reduce the friction coefficient effectively. The MoS2/PI composite solid lubricant works better than the single MoS2 solid lubricant, and the ratio of PI/MoS2 + PI at 20 per cent is the best recipe. The friction coefficient of the sample surfaces decreases first and then increases with the increase in texture densities, and a texture density of 19.6 per cent has the best effect on friction reduction. The friction coefficient of the textured surfaces gradually decreases with the increase in both rational speed and load. For the same texture density, the friction coefficient of textured surfaces decreases slightly with the increase in diameter. Furthermore, the mechanism of “rolling-extrusion-accumulation” occurred on the textured surface can collect the solid lubricant, thereby, improve the effect of lubricating and anti-friction. Originality/value The results of the experimental studies demonstrated the application prospect of laser surfaces texturing combined with solid lubricant in rolling friction pair.

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