Experimental Study on Tribological Properties of Graphite-MoS2 Coating on GCr15

2018 ◽  
Vol 140 (5) ◽  
Author(s):  
F. M. Meng ◽  
Z. T. Cui ◽  
Z. T. Cheng ◽  
H. L. Han
Keyword(s):  
Experimental Study ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Rotational Speed ◽  
Applied Load ◽  
Bearing Steel ◽  
Experimental Results ◽  
Gcr15 Bearing Steel ◽  
Mos2 Coating ◽  
Scar Width

The graphite-MoS2 coated on GCr15 bearing steel is prepared through air spraying and its tribological performances are investigated experimentally. Then its coefficient of friction (COF) and wear scar width (WSW) are investigated through the MFT-5000 multifunction tribometer and other test equipments. The experimental results show that the addition of the graphite can effectively decrease the COF and narrow the WSW of the MoS2. There exists a critical applied load for wearing out the surface with the graphite-MoS2 coating. Moreover, there exists an optimal rotational speed of 500 rpm to decrease the COF and WSW of the GCr15 steel.

Tribological performances of graphite–MoS2 coating at various high temperatures

2019 ◽  
Vol 233 (12) ◽  
pp. 1888-1902 ◽  
Author(s):  
Huali Han ◽  
Zhiyuan Qian ◽  
Fanming Meng ◽  
Zhongtao Cui
Keyword(s):  
High Temperatures ◽  
Coefficient Of Friction ◽  
Rotational Speed ◽  
Friction And Wear ◽  
Applied Load ◽  
Wear Scar ◽  
Graphite Content ◽  
Critical Rotational Speed ◽  
The Coefficient Of Friction ◽  
Scar Width

The tribological performances of the graphite–MoS2 coating deposited on the disc specimen, whose material is GCr15 steel, are experimentally investigated under high temperatures. Effects of graphite content, applied load, rotational speed and test temperature on the coefficient of friction and wear scar width of the coating are evaluated. The graphite–MoS2 coating with 20 wt% graphite addition exhibits the relatively small coefficient of friction and wear scar width at 200 ℃. At or beyond 400 ℃, the coating's lubricating effect is severely deteriorated with the testing time. At 200 ℃, there exists a critical applied load of 10 N and a critical rotational speed of 1250 rpm beyond which the MoS2 coating with 20 wt% graphite content is worn through and brings out a large coefficient of friction. The test results indicate that adding 20 wt% to 33 wt% graphite to MoS2 coating leads to an obvious reduction of the coefficient of friction and wear scar width for the coating at 200 ℃.

Experimental Study on the Lubrication Behaviors of Seawater-Lubricated Thordon Bearings

2012 ◽  
Vol 500 ◽  
pp. 297-300
Author(s):  
You Qiang Wang ◽  
Wen Li Sun
Keyword(s):  
Experimental Study ◽  
Friction Coefficient ◽  
Tribological Properties ◽  
Experimental Studies ◽  
Experimental Results ◽  
Bearing Clearance ◽  
Increasing Load

Seawater lubricated thordon bearing is one of the most appropriate bearings widely used in submerged pump for drainage. The apparatus for studying the lubrication behaviors of the seawater lubricated thordon bearings has been devised and established in the paper. The experimental studies on the tribological properties of the thordon bearings have been conducted under different load and velocity using the apparatus. Effects of load and velocity on friction coefficient of the thordon bearings have been estimated. The experimental results show that the friction coefficient decreases with increasing velocity; the friction coefficient decreases gradually at first and then decreases sharpy with increasing load; the friction coefficient increases sharply with the rising temperature. The experimental results also indicate that there is an appropriate bearing clearance for which the friction coefficient is up to minimum.

scholarly journals Reactive Pulsed Laser Deposition of Clustered-Type MoSx (x ~ 2, 3, and 4) Films and Their Solid Lubricant Properties at Low Temperature

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 653 ◽  
Author(s):  
V. Fominski ◽  
M. Demin ◽  
V. Nevolin ◽  
D. Fominski ◽  
R. Romanov ◽  
...  
Keyword(s):  
Low Temperature ◽  
Pulsed Laser Deposition ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Sliding Friction ◽  
Pulsed Laser ◽  
Molybdenum Sulfide ◽  
Laser Deposition ◽  
Thin Film Coatings ◽  
Mos2 Coating

We studied the tribological properties of amorphous molybdenum sulfide (MoSx) thin-film coatings during sliding friction in an oxidizing environment at a low temperature (−100 °C). To obtain films with different sulfur contents (x ~ 2, 3, and 4), we used reactive pulsed laser deposition, where laser ablation of the Mo target was performed in H2S at various pressures. The lowest coefficient of friction (0.08) was observed during tribo-testing of the MoS3 coating. This coating had good ductility and low wear; the wear of a steel counterbody was minimal. The MoS2 coating had the best wear resistance, due to the tribo-film adhering well to the coating in the wear track. Tribo-modification of the MoS2 coating, however, caused a higher coefficient of friction (0.16) and the most intensive wear of the counterbody. The MoS4 coating had inferior tribological properties. This study explored the mechanisms of possible tribo-chemical changes and structural rearrangements in MoSx coatings upon contact with a counterbody when exposed to oxygen and water. The properties of the tribo-film and the efficiency of its transfer onto the coating and/or the counterbody largely depended on local atomic packing of the nanoclusters that formed the structure of the amorphous MoSx films.

Experimental Study on the Tribological Properties of Water-Lubricated Rubber Bearings

2011 ◽  
Vol 291-294 ◽  
pp. 1454-1457 ◽  
Author(s):  
You Qiang Wang ◽  
Mei Shu Wang
Keyword(s):  
Experimental Study ◽  
Friction Coefficient ◽  
Tribological Properties ◽  
Experimental Studies ◽  
Experimental Results ◽  
Bearing Clearance ◽  
Tribological Behaviors ◽  
Rubber Bearing ◽  
Rubber Bearings ◽  
Increasing Load

Water lubricated rubber bearing is one of the most appropriate bearings widely used in submerged pump for drainage. The apparatus for studying the tribological behaviors of the water lubricated rubber bearings has been devised and established in the paper. The experimental studies on the tribological properties of the rubber bearings have been conducted under different load and velocity using the apparatus. Effects of load and velocity on friction coefficient of the rubber bearings have been estimated. The experimental results show that the friction coefficient decreases with increasing velocity; the friction coefficient increases at first and then decreases with increasing load; the friction coefficient increases sharply with the rising temperature. The experimental results also indicate that there is an appropriate bearing clearance which the friction coefficient is minimum.

Surface Integrity of Ti6Al4V Alloy under Dry Sliding Conditions

2013 ◽  
Vol 371 ◽  
pp. 126-130
Author(s):  
Zinaida Doni ◽  
Mihaela Buciumeanu ◽  
Liviu Palaghian
Keyword(s):  
Weight Loss ◽  
Surface Topography ◽  
Coefficient Of Friction ◽  
Surface Integrity ◽  
Applied Load ◽  
Normal Load ◽  
Bearing Steel ◽  
Ti6al4v Alloy ◽  
Dry Sliding ◽  
Roughness Parameters

The present paper is aimed to investigate the evolution of the surface integrity of Ti6Al4V alloy under reciprocating sliding in contact with bearing steel and ceramic balls (Al2O3). The evolution of the surface integrity states is characterized by the evolution of the surface topography and 3D roughness parameters with the applied normal load. The tribological characteristics (coefficient of friction and weight loss) are also presented for the two contact pairs used in this study. This study has proved that Ti6Al4V/Al2O3 contact pair can be used in applications were the applied load is variable.

Tribological properties of nitrogen-implanted GCr15 bearing steel and 40Cr structural steel

1990 ◽  
Vol 23 (4) ◽  
pp. 245-250
Author(s):  
Li Hong ◽  
Zhang Zong-Cheng ◽  
Chen Xiao ◽  
Liu Xing-Huai
Keyword(s):  
Structural Steel ◽  
Tribological Properties ◽  
Bearing Steel ◽  
Gcr15 Bearing Steel

scholarly journals The Role of Transfer Layer on the Sliding Wear Behavior of a Cu-15Ni-8Sn Alloy Under Different Loads

2021 ◽  
Author(s):  
Daoxi Li ◽  
Zhi Wang ◽  
Chao Zhao ◽  
Zongqiang Luo ◽  
wengwen Zhang
Keyword(s):  
Oxide Layer ◽  
Wear Mechanisms ◽  
Applied Load ◽  
Wear Behavior ◽  
Bearing Steel ◽  
Wear Property ◽  
Wear Properties ◽  
Transfer Layer ◽  
Gcr15 Bearing Steel ◽  
Nanocrystalline Particles

Abstract We studied the microstructure of the transfer layer and its effect on the wear mechanism and wear property of an aged Cu-15Ni-8Sn alloy against GCr15 bearing steel during dry sliding by changing the applied load. The results indicate that the aged Cu-15Ni-8Sn alloy shows different wear behavior and wear properties when the applied load changed, where the average friction coefficient and specific wear rate decrease quickly with increasing applied load in steady wear condition. The sample tested under relatively high applied load shows the best wear performance owing the thickest oxide layer exists in the transfer layer. The main wear mechanisms were found changing with varied applied. The metallic nanocrystalline particles and the relative ductile copper oxides promotes the formation of a thick and densified oxide layer. The change of the thickness and morphology of the oxide layer under different load can significantly affect the wear mechanisms.

Experimental Study on the Blanking of Thick Wall Metal Tube

2011 ◽  
Vol 181-182 ◽  
pp. 983-986
Author(s):  
Nan Hai Hao ◽  
Jiu Shi Li
Keyword(s):  
Experimental Study ◽  
Penetration Depth ◽  
Wall Thickness ◽  
Bearing Steel ◽  
Thick Wall ◽  
Outer Diameter ◽  
Metal Tube ◽  
Gcr15 Bearing Steel ◽  
Key Factor ◽  
Blanking Process

In this paper, we present a comprehensive experimental study on the blanking process of thick wall metal tube. The tube used in experiment is GCr15 bearing steel with 56 mm in outer-diameter and 6.5 mm in wall-thickness. The experiment was conducted with an experimental blanking apparatus, which consists of fixed die, moving die and inner cores rod. Two blanking schemes, single punching and cross punching, are compared through experiment. The single punching scheme is realizable for tube blanking but the effect is not acceptable in recent stage. Cross scheme is a better choice for tube blanking as the surface roughness in blanking section can be greatly improved. In cross scheme, the first penetration depth is the key factor to final blanking quality. It was found through experiment that the adequate first penetration depth is around 60 percent of the wall thickness of the tube.

scholarly journals Tribological Properties of Al2O3 Nanoparticles as Lithium Grease Additives

Lubricants ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 9
Author(s):  
Ahmed Nabhan ◽  
Ahmed Rashed ◽  
Nouby M. Ghazaly ◽  
Jamil Abdo ◽  
M. Danish Haneef
Keyword(s):  
Tribological Properties ◽  
Wear Scar ◽  
Al2o3 Nanoparticles ◽  
Lithium Grease ◽  
Pin On Disc ◽  
Scar Width

The tribological properties of Lithium grease specimens with different concentrations of Al2O3 nanoparticles were investigated using a pin on disc apparatus under different sliding speeds and normal loads. Results showed that Al2O3 nanoparticles enhanced the tribological properties of lithium grease and reduced the COF and wear scar width by approximately 57.9% and 47.5% respectively.

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