Self-lubricating behavior of VN coating catalyzed by solute Ag atom under dry friction and oil lubrication

2021 ◽  
Vol 409 ◽  
pp. 126845
Author(s):  
Ping Ren ◽  
Shangzhou Zhang ◽  
Jianxun Qiu ◽  
Xiaoyang Yang ◽  
Weiwei Wang ◽  
...  
Keyword(s):  
Dry Friction ◽  
Oil Lubrication

Tribofilm formation on the VN/7075 composite surface under sulfur-containing boundary lubrication

2020 ◽  
Vol 234 (11) ◽  
pp. 1726-1734
Author(s):  
Yaping Bai ◽  
Mengmeng Liu ◽  
Jianping Li ◽  
Yongchun Guo
Keyword(s):  
Abrasive Wear ◽  
Boundary Lubrication ◽  
Dry Friction ◽  
Wear Behavior ◽  
Oil Lubrication ◽  
Composite Surface ◽  
Delamination Wear ◽  
Lubrication Condition ◽  
Hot Press Sintering ◽  
Sulfur Containing

In this paper, Al7075 alloy and 15 wt% VN/7075 composite were prepared by ball milling and hot-press sintering. The microstructure, hardness, and wear behavior under different working conditions (environmental condition: dry friction, sulfur-containing boundary lubrication, and oil lubrication) were studied. The results showed that the distribution of VN was dispersive and uniform in 15 wt% VN/7075 composite without obvious agglomeration. The hardness (119.5 Hv) of 15 wt% VN/7075 composite was 46.1% higher than the Al7075 alloy (81.8 Hv). Friction and wear behavior test results showed that under sulfur-containing boundary lubrication condition, according to the tribofilm layer on the worn surface of 15 wt% VN/7075 composite, the friction coefficient of 15 wt% VN/7075 composite decreased by 37.6% compared with the Al7075 alloy. The main wear mechanism of 15 wt% VN/7075 composite was delamination wear and abrasive wear under dry friction, while under sulfur-containing boundary lubrication and oil lubrication, it changed to mild abrasive wear.

Tribological properties of Ti-doped diamond-like carbon coatings under dry friction and PAO oil lubrication

2018 ◽  
Vol 51 (3) ◽  
pp. 361-370 ◽  
Author(s):  
Youzhi Guo ◽  
Peng Guo ◽  
Lili Sun ◽  
Xiaowei Li ◽  
Peiling Ke ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Dry Friction ◽  
Diamond Like Carbon ◽  
Oil Lubrication ◽  
Carbon Coatings

COMBINED PLASMA NITRIDING AND SURFACE TEXTURING FOR IMPROVING TRIBOLOGICAL PERFORMANCE OF 316 STAINLESS STEEL

2020 ◽  
Vol 27 (10) ◽  
pp. 1950226
Author(s):  
ZHIQI LIU ◽  
HUANHUAN WANG ◽  
NAIMING LIN ◽  
RENHUI DUAN
Keyword(s):  
Stainless Steel ◽  
Mass Loss ◽  
Dry Friction ◽  
Plasma Nitriding ◽  
Surface Texturing ◽  
Tribological Performance ◽  
Oil Lubrication ◽  
316 Stainless Steel ◽  
Nitrided Surface ◽  
Lubrication Conditions

Combined plasma nitriding and surface texturing approach were conducted on 316 stainless steel to enhance the tribological performance. Five different surfaces (316 substrates, plasma-nitrided 316, surface-textured 316, plasma-nitrided surface-textured 316, and surface-textured plasma-nitrided 316) were investigated. The tribological behaviors were studied using a ball-on-disk rotary tribometer against counterparts of Si3N4 balls in the air and under oil lubrication conditions. The results were analyzed from the aspects of friction coefficient, mass loss, and surface morphology about the tested specimens. The results presented that the frictional properties of the surface of plasma-nitrided surface-textured 316 were optimal under both friction conditions. Under dry friction conditions, the influence of plasma nitriding on mass loss was greater than that of surface texturing. Under oil lubrication conditions, the influence of surface texturing on mass loss was greater than that of plasma nitriding, and the processing sequence of surface texturing and plasma nitriding had little effect on the mass loss. The better wear resistance of plasma-nitrided surface-textured 316 resulted from the following aspects: first, the nitriding layer improved the surface hardness of the material. Secondly, the surface texture can capture the debris under dry friction conditions and provide continuous lubrication under oil lubrication condition.

The Tribological Characteristics of Polyimide Bonded Solid Lubricating Films under Different Lubrication Conditions

2011 ◽  
Vol 399-401 ◽  
pp. 2026-2030 ◽  
Author(s):  
Yin Ping Ye ◽  
Rui Jie Yang ◽  
Hong Qi Wan ◽  
Jian Min Chen ◽  
Hui Di Zhou
Keyword(s):  
Wear Resistance ◽  
Diesel Fuel ◽  
Dry Friction ◽  
Friction And Wear ◽  
Friction Condition ◽  
Oil Lubrication ◽  
Lubricating Film ◽  
Lubrication Oil ◽  
Lubrication Conditions ◽  
Paraffin Liquid

In this paper, the tribological behaviors of polyimide bonded PTFE solid lubricating film and polyimide bonded MoS2 solid lubricating film under dry sliding and under lubrication of kerosene oil, diesel fuel, paraffin liquid and lubrication oil were investigated by using a ring-on-block wear tester. The results show that the anti-friction and wear-resistance properties of both lubricating films are greatly improved under oil lubrication conditions as compared with the dry friction condition; the friction coefficients of both lubricating films under different oil lubrications keep steady-state value with 0.08; but both lubricating films under different oil lubrications reveal the different wear-resistance properties, such as the best wear-resistance properties under diesel fuel, followed by paraffin liquid, lubrication oil and kerosene oil; the differences in the wear-resistance properties of the lubricating films under different lubrication conditions are mainly ascribed to the influence of the oil’s characteristics, especially boiling point and viscosity.

Output trajectory tracking for mechanical systems with dry friction: A DPC approach

1997 ◽  
Author(s):  
D. von Wissel ◽  
R. Nikoukhah ◽  
F. Delebecque ◽  
P.-A. Bliman ◽  
M. Soline
Keyword(s):  
Trajectory Tracking ◽  
Dry Friction ◽  
Mechanical Systems ◽  
Output Trajectory

Improving the wear resistance of hoe blades by modifying of restoration coatings

2019 ◽  
Vol 24 (94/4) ◽  
pp. 27-32
Author(s):  
T.S. Skoblo ◽  
I.N. Rybalko ◽  
A.V. Tihonov ◽  
T.V. Maltsev
Keyword(s):  
Wear Resistance ◽  
Transition Layer ◽  
Surface Coating ◽  
Dry Friction ◽  
Raw Materials ◽  
Bentonite Clay ◽  
Magnetic Fraction ◽  
Cutting Surface ◽  
Agricultural Machines ◽  
Modifying Additive

The possibility of using a non-magnetic fraction of a detonation charge with a diamond fraction from the disposal of ammunition to modify the restoration coatings of a natural product – clay and secondary raw materials — was studied. Four different coating variants were investigated. For this, a T-620 electrode was used with its additional modification by coating with bentonite clay, as well as with a non-magnetic fraction of the detonation charge and applying it in the form of a slip coating on the cutting surface of the cultivator. It is shown that the use of such additives allows to increase the resistance of the working tool of agricultural machines, reduces its tendency to damage due to the minimum penetration of the thin-walled product of the hoe blade and a decrease in the cross section of the transition layer and the level of stress. Each modifier makes changes to increase the microhardness to varying degrees. An increase in microhardness is observed on the surface of the coating and its gradual decrease to the transition layer. The surface coating with the additional introduction of bentonite clay in a liquid bath has the highest microhardness. Its microhardness varies from HV-50-1009.7 to HV-50-615.2. Similarly, the effect of the modifying additive of the detonation charge, the microhardness varies from HV-50-969.6 to HV-50-633.26. When clay or a mixture is introduced into the restoration coating, the wear resistance increases by 1.3 - 2 times with respect to the deposited surfacing only by the electrode and by 2 - 3 times to the initial material of the cultivator. It was found that the lowest coefficient is characteristic for dry friction, as well as for hydroabrasive, for samples with additional modification with clay or a detonation charge

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