scholarly journals Development of hot surfaces generated by friction contacts of titanium alloy and steel

2020 ◽  
Vol 12 (9) ◽  
pp. 168781402095779
Author(s):  
He Pan ◽  
Yang Zhang
Keyword(s):  
Titanium Alloy ◽  
Friction Coefficient ◽  
Surface Temperature ◽  
Coal Mine ◽  
Ignition Source ◽  
Low Friction ◽  
Friction Process ◽  
Tc4 Titanium Alloy ◽  
Element Simulation ◽  
Hot Surface

When light alloys used in coal mine, the sparks generated by mechanical friction and impacts are the main effective ignition source. While the hot surfaces are concomitant in friction process, prior to the occurrence of mechanical sparks, whether the hot surfaces will be an effective ignition source. Then this paper focuses on the development of hot surfaces generated by TC4 titanium alloy at the low friction velocities. Experiments and finite element simulation methods were used together to describe the temperature field of TC4 titanium alloy. It was found that the temperature of hot surfaces increased with the load and increased much faster at higher relative speed. By means of regression analysis, the variation law of friction coefficient and contact pressure with loads and the variation law of hot surface temperature with friction coefficient and pressure were studied, then the fitting curve of hot surface temperature was obtained. The results of calculations and experiments indicate that hot surfaces generated by light alloy was possible to be an effective ignition source for methane air mixture in coal mine.

Friction Characteristics of Surface Nitriding Modification Layer of Ti-6Al-4V ELI Titanium Alloy in Seawater Environment

2020 ◽  
Vol 1005 ◽  
pp. 18-23
Author(s):  
Xing Sheng Lao ◽  
Xu Feng Zhao ◽  
Yong Liu ◽  
Chun Hui Dai ◽  
Wei Jian Lyu
Keyword(s):  
Titanium Alloy ◽  
Friction Coefficient ◽  
Physical Properties ◽  
Surface Treatment ◽  
Glass Fiber ◽  
High Load ◽  
Tc4 Titanium Alloy ◽  
Tin Bronze ◽  
Friction Tester ◽  
Seawater Environment

In order to study the tribological properties of titanium alloy materials and reinforced PTFE pairs treated by surface nitriding modification in seawater environment under low speed and high load, the physical properties of surface nitriding modified treatment were observed and measured with Ti-6Al-4V ELI as the substrate, and the samples of substrate and surface nitriding were modified as disks to 25% fiberglass , 15% glass fiber +5% graphite and 60% tin bronze reinforced PTFE as distribution pins, the friction properties of substrate and surface nitriding modification layer in seawater environment were studied by friction tester. The results show that the friction coefficient between titanium alloy and auxiliary pair is above 0.1, the friction coefficient of titanium alloy surface treatment specimen is lower than that of TC4 titanium alloy, the wear of surface nitriding modified treatment sample is significantly slight, the friction coefficient of 60% tin bronze distribution is the highest, and the friction coefficient of 15% fiberglass +5% graphite is about 15% higher.

scholarly journals Polyurethanes from the crystalline prepolymers resistant to abrasive wear

2014 ◽  
Vol 16 (4) ◽  
pp. 14-20 ◽  
Author(s):  
Agata Domańska ◽  
Anna Boczkowska ◽  
Marta Izydorzak-Woźniak ◽  
Zbigniew Jaegermann ◽  
Małgorzata Grądzka-Dahlke
Keyword(s):  
Titanium Alloy ◽  
Shear Strength ◽  
Friction Coefficient ◽  
Abrasive Wear ◽  
Medical Application ◽  
Phenyl Isocyanate ◽  
Low Friction ◽  
Preliminary Results ◽  
Trade Name ◽  
Selection Of

Abstract The research aimed at the selection of polyurethanes synthesized from poly(tetramethylene ether) glycol (PTMEG), as well as from two different isocyanates 4,4′-methylenebis(cyclohexyl)isocyanate (HMDI) and 4.4′-methylenebis(phenyl isocyanate) (MDI) in order to obtain polyurethane with increased resistance to abrasive wear and degradation for bio-medical application. Polyurethanes were fabricated from crystalline prepolymers extended by water. The paper presents preliminary results on polyurethane surface wettability, friction coefficient for different couples of the co-working materials such as polyurethane-polyurethane, polyurethane-titanium alloy, polyurethane-alumina, in comparison to commonly used polyethylene-titanium alloy. Shear strength of polyurethane-alumina joint, as well as viscosity of prepolymers were also measured. The values of friction coefficient were compared to literature data on commercially available polyurethane with the trade name Pellethane. Polyurethanes obtained are characterized by low abrasive wear and low friction coefficient in couple with the titanium alloy, what makes them attractive as possible components of ceramic-polymer endoprosthesis joints.

Friction Process of Superlubricity

2012 ◽  
Author(s):  
Jinjin Li ◽  
Chenhui Zhang ◽  
Jianbin Luo
Keyword(s):  
Friction Coefficient ◽  
Phosphoric Acid ◽  
Acid Solution ◽  
Layer Structure ◽  
Contact Region ◽  
Phosphoric Acid Solution ◽  
Low Friction ◽  
Friction Process ◽  
Second Stage ◽  
Three Stages

The friction process of superlubricity (μ = 0.004) obtained by phosphoric acid solution has been investigated by a traditional tribometer. The evolution of friction coefficient with time indicates that the friction process of superlubricity is divided into three stages, i.e. friction reducing rapidly process, low friction process and superlubricity process. The feature of these three stages is discussed according to several experiments. The result indicates that the contact region in superlubricity state is a three layer structure formed after the first stage and the second stage, which is the origin of ultra-low friction.

Study of the effect of surface laser texture on tribological properties of cemented carbide materials

2020 ◽  
Vol 234 (6-7) ◽  
pp. 993-1006
Author(s):  
Na Zhang ◽  
Fazhan Yang ◽  
Fulin Jiang ◽  
Guohua Liu
Keyword(s):  
Titanium Alloy ◽  
Friction Coefficient ◽  
Cutting Tools ◽  
Surface Texturing ◽  
Potential Method ◽  
Cemented Carbide ◽  
Textured Surface ◽  
Low Friction ◽  
Dry Cutting ◽  
Groove Texture

Surface texturing has become a potential method to obtain a low friction coefficient under dry/lubricated conditions for different mechanical product surfaces. The mechanism of friction and wear reduction from a micro-texture on the surface of cemented carbide cutting tools was investigated by dry cutting a titanium alloy. Three kinds of micro-textures, namely, line, sinusoidal and rhombic grooves, with different area occupancy rates were produced by a laser on the cemented carbide surface. Experiments and finite element simulation of ABAQUS were used to investigate the tribological characteristics of micro-textured cemented carbide. The results indicated that the line-textured cemented carbide with an area occupancy rate of 10% showed a low friction coefficient of 0.076, which is approximately 34% of the non-textured sample. Few adhesives appeared on the textured surface, while a large number of adhesives were attached to the smooth surface after 30 min of dry friction between the cemented carbide and the titanium alloy balls. Moreover, among the three textures, the line-groove texture has the smallest friction coefficient and a good anti-wear effect. The results show that the existence of a groove texture can effectively reserve the wear debris, reduce the bond wear and weaken the furrow effect.

Investigation of Micro-Tribological Behavior of MS2 Nanotubes

2007 ◽  
Vol 121-123 ◽  
pp. 785-788 ◽  
Author(s):  
Chang Sheng Li ◽  
Ke Hong Yan ◽  
Jun Mao Li ◽  
Xiao Ping Shen ◽  
Kang Min Chen
Keyword(s):  
Friction Coefficient ◽  
Tribological Behavior ◽  
Solid Lubricants ◽  
Van Der Waals Interactions ◽  
Low Friction ◽  
Research Papers ◽  
Friction Process ◽  
Pin On Disc ◽  
Metal Dichalcogenides ◽  
Covalent Interactions

It is well known that metal dichalcogenides MS2 (M=Mo, W, Nb, Ta, TiS, Zr ,Hf, S=S, Se) have lamellar structure, the bonds of adjacent lamellae are weak van der Waals interactions and inter-lamellar are strong covalent interactions. The structures make adjacent lamellae easy to slip and it shows low friction coefficient during friction process. MS2 are often used as solid lubricants in high/low temperature, heave load and vacuum, in which oil is failure. WS2 has better high temperature properties than MoS2, although little natural WS2 mineral has been deposited, and people must synthesize it by chemical means, so its price is nearly 5 times expensive than that of MoS2. Until now little study is made comparing with MoS2. Furthermore the research papers about tribological behavior of NbS2, TaS2, TiS2, ZrS2, HfS2 are not seen. In this study the thermal decomposition method is used to produce fullerene-like MS2 nanotubes. The morphology, microstructure and tribological behavior of MS2 nanotubes are investigated by means of SEM, TEM, XRD and AFM. The results show that the diameter of MoS2, WS2 and NbS2 nanotube is less than 100nm, and the length is more than 2μm. The MoS2, WS2 nanotube has lower friction coefficient than MoS2 powder tested by AFM using Si3N4 probe. Similar results are also found for NbS2 nanotube. The macroscopic friction test for pin on disc tester shows nearly the same results. TEM image shows that MS2 nanotubes have rolling debris between two antagonist surfaces, and MoS2 powder only has flattened debris. It may be the fullerene structure brings the chemical stability and lead low friction.

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