Tribological properties and mechanism of the bilayer iron based powder metallurgy materials

2018 ◽  
Vol 70 (9) ◽  
pp. 1642-1648 ◽  
Author(s):  
Guotao Zhang ◽  
Yanguo Yin ◽  
Ming Xu ◽  
Congmin Li
Keyword(s):  
Powder Metallurgy ◽  
Tribological Properties ◽  
High Strength ◽  
Wear Properties ◽  
Content Type ◽  
Lubricating Property ◽  
New Type ◽  
Iron Based ◽  
Friction And Wear Properties ◽  
Better Than

Purpose This paper aims to obtain high mechanical strength and good self-lubricating property of iron-based powder metallurgy materials. A new type of bilayer material with dense substrate and porous surface was proposed in this paper to obtain high strength and good self-lubricating property. Design/methodology/approach The materials were prepared by powder metallurgy. Their friction and wear properties were investigated with an end-face tribo-tester. Energy dispersive spectrometer, X-ray diffraction and the 3D laser scanning technologies were used to characterise the tribological properties of materials. The tribological and bearing mechanisms of the monolayer and bilayer materials were compared. Findings The results show that adding proper TiH2 can effectively improve the porosity and hardness. With the TiH2 content increased from 0 to 4 per cent, the average friction coefficients increase slowly, and the wearability decreases first and then increases. When containing 3.5 per cent TiH2, high strength and good self-lubrication characteristics are obtained. Besides, the tribological properties of monolayer materials are better than those of bilayer materials when the load is between 980 and 1,470 N, while the opposite result is obtained under the load varied from 1,470 to 2,450 N. In the bilayer material, the porous oil surface can lubricate well and the dense substrate can improve the mechanical property. So, its comprehensive tribological and mechanical properties are better than those of monolayer material. Originality/value The friction and wear properties of a new type bilayer materials were investigated. And their tribological mechanisms were proposed. This work can provide a theoretical reference for developing high-performance iron-based oil materials under boundary lubrication.

Tribological properties of the epoxy resin-based solid lubricant coating modified by Kevlar fibers

2018 ◽  
Vol 70 (9) ◽  
pp. 1706-1713 ◽  
Author(s):  
Guotao Zhang ◽  
Yanguo Yin ◽  
Ting Xie ◽  
Dan Li ◽  
Ming Xu ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Epoxy Resin ◽  
Tribological Properties ◽  
Dry Friction ◽  
Friction And Wear ◽  
Solid Lubricant ◽  
Transfer Film ◽  
Wear Properties ◽  
Content Type ◽  
Friction And Wear Properties

Purpose This paper aims to obtain high mechanical and good tribological properties of epoxy resin-based coatings under dry friction conditions. Design/methodology/approach Bonded solid lubricant coatings containing Kevlar fibres were prepared by a spraying method. The friction and wear properties of the coatings were experimentally investigated with a face-to-face tribometre under dry friction conditions. Scanning electron microscopy, energy dispersive X-ray spectroscopy and 3D laser scanning technologies were used to characterise the tribological properties. The action mechanism of the Kevlar fibres on a solid lubricant transfer film was also analysed. Findings Adding Kevlar fibres can significantly improve the wear resistance of the coatings. When the Kevlar fibre content increases, the tribological properties of the coatings improve and then worsen. Superior properties are obtained with 0.03 g of Kevlar fibres. Appropriately increasing the load or speed is beneficial to the removal of the outer epoxy resin and the formation of a lubricant film. During friction, the solid lubricants wrapped in the epoxy resin accumulate on the surface to form a transfer film that shows a good self-lubricating performance. In the later friction stage, fatigue cracks occur on the solid lubricant film but cannot connect to one another because of the high wear resistance and the entanglement of the rod-like Kevlar fibres. Thus, no large-area film falls from the matrix, thereby ensuring the long-term functioning of solid lubricant coatings. Originality/value Epoxy resin-based solid lubricant coatings modified by Kevlar fibres were prepared, and their friction and wear properties were investigated. Their tribological mechanisms were also proposed. This work provided a basis for the analysis of the tribological properties and design of bonded solid lubricant coatings containing Kevlar fibres.

scholarly journals Effect of temperature and mating pair on tribological properties of DLC and GLC coatings under high pressure lubricated by MoDTC and ZDDP

Friction ◽  
2020 ◽  
Author(s):  
Kang Liu ◽  
Jia-jie Kang ◽  
Guang-an Zhang ◽  
Zhi-bin Lu ◽  
Wen Yue
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Effect Of Temperature ◽  
Wear Properties ◽  
Dlc Coatings ◽  
Base Oil ◽  
Two Temperatures ◽  
Friction And Wear Properties ◽  
Lubrication Conditions ◽  
Better Than

AbstractDiamond-like carbon (DLC) and graphite-like carbon (GLC) coatings have good prospects for improving the surface properties of engine parts. However, further understanding is needed on the effect of working conditions on tribological behaviors. In this study, GLC and two types of DLC coatings were deposited on GCr15 substrate for investigation. The friction and wear properties of self-mated and steel-mated pairs were evaluated. Two temperatures (25 and 90 °C), three lubrication conditions (base oil, molybdenum dithiocarbamate (MoDTC)-containing oil, MoDTC+zinc dialkyldithiophosphate (ZDDP)-containing oil), and high Hertz contact stress (2.41 GPa) were applied in the experiments. The results showed that high temperature promoted the effect of ZDDP on steel-mated pairs, but increased wear under base oil lubrication. The increased wear for steel-mated pairs lubricated by MoDTC-containing oil was due to abrasive wear probably caused by MoO3 and β-FeMoO4. It was also found that in most cases, the tribological properties of self-mated pairs were better than those of steel-mated pairs.

The Effect of Lubricant on Tribological Properties of Carbonyl Iron-Based Magnetorheological Fluids

2011 ◽  
Vol 197-198 ◽  
pp. 540-543 ◽  
Author(s):  
Zhi De Hu ◽  
Hua Yan ◽  
Xue Mei Wang ◽  
Hai Zhe Qiu
Keyword(s):  
Tribological Properties ◽  
Carbonyl Iron ◽  
Engineering Application ◽  
Magnetorheological Fluid ◽  
Wear Properties ◽  
Wear Scar Diameter ◽  
Steel Surfaces ◽  
Iron Based ◽  
Friction And Wear Properties ◽  
Worn Surface

Magnetorheological fluid (MRF) is a new kind of smart material, it is very necessary for us to study its tribological properties because it will be widely used in engineering application. In this paper, the tribological behavior of Carbonyl Iron-based magnetorheological fluid (MRF) was investigated on a four-ball tribological tester, the influence of lubricant on friction coefficient and wear scar diameter was discussed, the morphology of the wear steel surfaces lubricated with MRF were observed by a scanning electron microscope. The results show that the addition of MoS2can significantly improve the tribological properties of clay-based MRF. However, the friction and wear properties of silica-based MRF become bad after the addition of MoS2. The morphology of worn surface lubricated with the MRF added MoS2is similar to that without additive, but the groove of wear marks lubricated with clay-based MRF is more shallower and the area of the worn surface is smaller in the condition of adding MoS2.

scholarly journals Preparation and Tribological Properties of Modified MoS2/SiC/Epoxy Composites

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1731
Author(s):  
Cheng Liu ◽  
Meijuan Li ◽  
Qiang Shen ◽  
Haikun Chen
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
Resin Matrix ◽  
Wear Properties ◽  
Inorganic Particles ◽  
Volume Wear ◽  
Friction And Wear Properties ◽  
Worn Surface ◽  
Better Than

In order to improve the tribological properties of epoxy (EP), EP composites were prepared by filling different proportions of silicon carbide (SiC) particles and molybdenum disulfide (MoS2) powder. SiC and MoS2 particle surfaces were modified by the silane coupling agent KH560 to improve dispersion and avoid agglomeration of the inorganic particles in the EP resin matrix. The effect of different proportions of modified MoS2 content on the tribological properties of SiC/EP composites, and the wear mechanism of the worn surface, were investigated when the filler content was fixed at 55 wt.%. The results indicate that the friction and wear properties of modified MoS2/SiC/EP composites are better than SiC/EP composites without modified MoS2. When the modified MoS2 content is 4 wt.%, the average friction coefficient and volume wear rate of the modified MoS2/SiC/EP composite are 0.447 and 14.39 × 10−5 mm3/N·m, respectively, which is reduced by 10.06% and 52.13% in comparison with that of the 55 wt.% SiC/EP composite. Furthermore, the average friction coefficient of a composite containing 4 wt.% MoS2 is 16.14% lower, and the volume wear rate is 92.84% lower than that of pure EP.

Synthesis and Tribological Properties of MoSe2/C and MoSe2 Nanoflakes

2011 ◽  
Vol 399-401 ◽  
pp. 1946-1950 ◽  
Author(s):  
Wen Jing Li ◽  
Chang Sheng Li ◽  
Kong Qiang Wu
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Growth Process ◽  
Friction And Wear ◽  
Sliding Friction ◽  
Inorganic Materials ◽  
Wear Properties ◽  
Repair Mechanisms ◽  
Friction And Wear Properties ◽  
Better Than

The inorganic materials（MoSe2/C) and MoSe2 were synthesized via solid-state reaction methods and characterized by a series of techniques. The growth process of the products was discussed on the basis of the experimental facts. The tribological properties of MoSe2/C and MoSe2as additives in 150bn basic oil were investigated by UMT-2 multispecimen tribotester. Under the determinate conditions, the friction coefficient of the basic oil containing MoSe2/C (or MoSe2) was lower than that of the basic oil. Moreover, the tribological property of the basic oil with the MoSe2/C was better than that with MoSe2nanoflakes. A combination of sliding friction, stable tribofilm and fill in-repair mechanisms on the rubbing surface could explain the good friction and wear properties of MoSe2/C and MoSe2as additives.

Measurements of friction and wear of powder composite materials by the «pin-on-disc» mechanism

2020 ◽  
pp. 60-63
Author(s):  
F. F. Yusubov
Keyword(s):  
Composite Materials ◽  
Powder Metallurgy ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Optical Microscope ◽  
Wear Properties ◽  
Pin On Disc ◽  
Dry Mixing ◽  
Friction And Wear Properties ◽  
Powder Metallurgy Methods

In this study, friction and wear properties of friction composite materials which is developed by powder metallurgy methods was examined.The technological sequence such as grinding, dry mixing, pressing and sintering wereused in the manufacturing of materials. The tribological properties of the obtained specimens were studied on a vertical machine MMW-1 using the «pin-on-disc» mechanism. The optical microscope Amscope was used to analyze the wear surfaces.

The Analysis on the Tribological Properties of TPU/PVC Blends under Oil Lubrication

2013 ◽  
Vol 774-776 ◽  
pp. 94-98
Author(s):  
Dao Yuan Pan ◽  
Peng Peng Wu ◽  
Zhong Xue Gao ◽  
Yu Zeng Zhang
Keyword(s):  
Working Conditions ◽  
Friction And Wear ◽  
Oil Lubrication ◽  
Wear Properties ◽  
Operation Conditions ◽  
Hydraulic Steering ◽  
Pros And Cons ◽  
Friction And Wear Properties ◽  
Lubrication Conditions ◽  
Better Than

Based on actual working conditions and parameters of the hydraulic steering gear, the purpose is optimizing the rubber seal of steering gear by different rubbers mixing technology. Compare the five kinds of rubber with metal of the friction characteristics in dynamic fit, it can obtain a performance excellent rubber real in the specific operation conditions. And then improve the overall service life of the steering gear. It is first prepared the same hardness TPU and PVC and blends that the ratio is 3:7, 5:5and7:3 in this article. The pros and cons of the five rubbers are analyzed in friction and wear properties of the above experimental. The test curve of coefficient friction and wear with time has been done under different load at constant low speed. It determines TPU/PVC = 3:7 blends through friction and wear and wear mechanism of five rubbers with steel comparatively analyses, and the heat resistance and wear resistance of them are better than the other TPU/PVC blends and PVC under oil lubrication conditions.

Amorphous Carbon Coatings for Locally Adjusted Tribological Properties in Sheet Bulk Metal Forming

2012 ◽  
Vol 504-506 ◽  
pp. 969-974 ◽  
Author(s):  
Harald Hetzner ◽  
Stephan Tremmel ◽  
Sandro Wartzack
Keyword(s):  
Amorphous Carbon ◽  
Tribological Properties ◽  
Metal Forming ◽  
Friction And Wear ◽  
Wear Properties ◽  
Carbon Coatings ◽  
Bulk Metal ◽  
Bulk Metal Forming ◽  
Friction And Wear Properties ◽  
Amorphous Carbon Coatings

In sheet bulk metal forming, locally adapted friction properties of the contact tool/workpiece are an appropriate means for the targeted enhancement of the material flow, enabling an improved form filling and lowered forming forces. However, the implementation of desirable friction conditions is not trivial. And further, friction is inseparably linked to wear and damage of the contacting surfaces. This calls for a methodological approach in order to consider tribology as a whole already in the early phases of process layout, so that tribological measures which allow fulfilling the requirements concerning local friction and wear properties of the tool surfaces, can already be selected during the conceptual design of the forming tools. Thin tribological coatings are an effective way of improving the friction and wear properties of functional surfaces. Metal-modified amorphous carbon coatings, which are still rather new to the field of metal forming, allow tackling friction and wear simultaneously. Unlike many other types of amorphous carbon, they have the mechanical toughness to be used in sheet bulk metal forming, and at the same time their friction properties can be varied over wide ranges by proper choice of the deposition parameters. Based on concrete research results, the mechanical, structural and special tribological properties of tungsten-modified hydrogenated amorphous carbon coatings (a-C:H:W) are presented and discussed against the background of the tribological requirements of a typical sheet bulk metal forming process.

scholarly journals Multiwalled carbon nanotubes enhanced the friction layer evolution and self-lubricating property of TiAl-10 wt% Ag-1 wt% MWCNTs sample

RSC Advances ◽  
2017 ◽  
Vol 7 (64) ◽  
pp. 40592-40599 ◽  
Author(s):  
Kang Yang ◽  
Hongru Ma ◽  
Xiyao Liu ◽  
Yangming Zhang ◽  
Qiang He
Keyword(s):  
Carbon Nanotubes ◽  
Energy Consumption ◽  
Multiwalled Carbon Nanotubes ◽  
Friction And Wear ◽  
Wear Properties ◽  
Multiwalled Carbon ◽  
Tial Alloys ◽  
Lubricating Property ◽  
Friction And Wear Properties ◽  
Reducing Energy

The necessity of reducing energy consumption and usage of material in aerospace and aviation industries drives the further optimization of friction and wear properties of TiAl alloys.

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