Polymeric Solid Lubricant Transfer Films: Relating Quality to Wear Performance

2021 ◽  
pp. 175-200
Author(s):  
Jiaxin Ye ◽  
Diana Haidar ◽  
David Burris
Keyword(s):  
Solid Lubricant ◽  
Wear Performance ◽  
Lubricant Transfer ◽  
Transfer Films ◽  
Polymeric Solid

Improved Wear Performance by the Incorporation of Solid Lubricants During Thermal Spraying

2000 ◽  
Author(s):  
B.R. Marple ◽  
J. Voyer
Keyword(s):  
Sliding Wear ◽  
Solid Lubricant ◽  
Thermal Spraying ◽  
Solid Lubricants ◽  
Degradation Process ◽  
Tribological Performance ◽  
Optimum Level ◽  
Wear Performance ◽  
Wear Tests ◽  
Minimum Wear

Abstract For components that are required to function in sliding or rubbing contact with other parts, degradation often occurs through wear due to friction between the two contacting surfaces. Depending on the nature of the materials being used, the addition of water as a lubricant may introduce corrosion and accelerate the degradation process. To improve the performance and increase the life of these components, coatings may be applied to the regions subject to the greatest wear. These coatings may be engineered to provide internal pockets of solid lubricant in order to improve the tribological performance. In the present study, coatings containing a solid lubricant were produced by thermal spraying feedstock powders consisting of a blend of tungsten carbide-metal and a fluorinated ethylene-propylene copolymer-based material. The volume content of this Teflon-based material in the feedstock ranged from 3.5 to 36%. These feedstocks were deposited using a high velocity oxy-fuel system to produce coatings having a level of porosity below 2%. Sliding wear tests in which coated rotors were tested in contact with stationary carbon-graphite disks identified an optimum level of Teflon-based material in the feedstock formulation required to produce coatings exhibiting minimum wear. This optimum level was in the range of 7-17% by volume and depended on the composition of the cermet constituent. Reductions in mass loss for the couples on the order of 50% (an improvement in performance by a factor of approximately two) were obtained for the best-performing compositions, as compared to couples m which the coating contained no solid lubricant.

A study of the role of solid lubricant and fibrous reinforcement in modifying the wear performance of polyethersulphone

2000 ◽  
Vol 17 (2) ◽  
pp. 99-107 ◽  
Author(s):  
J. Bijwe ◽  
J. John Rajesh ◽  
A. Jeyakumar ◽  
A. K. Ghosh
Keyword(s):  
Solid Lubricant ◽  
Wear Performance

Quantitative characterization of solid lubricant transfer film quality

Wear ◽  
2014 ◽  
Vol 316 (1-2) ◽  
pp. 133-143 ◽  
Author(s):  
J. Ye ◽  
H.S. Khare ◽  
D.L. Burris
Keyword(s):  
Solid Lubricant ◽  
Transfer Film ◽  
Quantitative Characterization ◽  
Lubricant Transfer

Wear Performance of Titanium and Niobium Added MoS2 Coatings Under Isobutane Exposure

2009 ◽  
Author(s):  
Mahmut F. Aksit ◽  
Huseyin Kizil ◽  
Ihsan Efeoglu ◽  
Kemal Sariibrahimoglu
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
Lamellar Structure ◽  
Solid Lubricant ◽  
Sudden Increase ◽  
Wear Performance ◽  
Bearing Materials ◽  
Lubrication Condition ◽  
Friction Curve ◽  
Sliding Distance

As conventional refrigerants phased out, Hydrocarbons such as Isobutane emerged as the main alternative in refrigeration industry. However, compatibility of these new ozone friendly refrigerants with compressor oils and bearing materials need to be evaluated. This study investigates wear performance of Titanium and Niobium added MoS2 coatings running against 100Cr6 steel under isobutane exposure. Wear performance is established under starved lubrication condition by comparing the maximum achieved sliding distance before the sudden increase and fluctuation of the friction curve. Sinter steel samples were coated with MoS2, MoS2-Ti, MoS2-Nb thin films by magnetron sputtering. The concept of durability distance has been defined as the distance until a sudden fluctuation of the friction curve is observed. It was found that addition of Titanium and Niobium adversely affects wear performance of the MoS2 coatings under isobutane exposure. This can be attributed to the possible degradation of MoS2 lamellar structure that acts as solid lubricant under such exposure.

Investigation of the high temperature dry sliding wear behavior of graphene nanoplatelets reinforced aluminum matrix composites

2020 ◽  
pp. 002199832097903
Author(s):  
Seçkin Martin ◽  
Sinan Kandemir ◽  
Maksim Antonov
Keyword(s):  
High Temperature ◽  
Tribological Properties ◽  
Solid Lubricant ◽  
Elevated Temperatures ◽  
Wear Behavior ◽  
Aluminum Matrix ◽  
Graphene Nanoplatelets ◽  
Aluminum Matrix Composites ◽  
Wear Performance ◽  
Ball On Disc

In this study, graphene nanoplatelets (GNPs) with a thickness of 50-100 nm have been utilized to improve the mechanical and tribological properties of A360 alloy due to their extraordinary mechanical properties and solid lubricant nature. For the investigation of tribological properties, ball-on disc tests were carried out at various temperatures including room temperature (RT), 150 °C, and 300 °C. According to the hardness and ball-on-disc test results, the nanocomposite samples reinforced with GNPs exhibited improved hardness and wear resistance. The improvement in the wear behavior of nanocomposites was referred to the temporarily formed solid lubricant film of harder GNPs during the wear, and hence coefficient of friction (COF) and volume loss were considerably reduced. Abrasive-adhesive, oxidative, and mild-to-severe were found to be main wear mechanisms at RT, 150 °C, and 300 °C, respectively. Overall, the results show that the nanocomposites fabricated by casting method combined with mechanical stirring and ultrasonication have promising wear performance, especially at elevated temperatures. This may suggest that these developed materials could be potential candidates to be used in the engineering applications requiring high temperature wear performance.

Effects of Some Solid Lubricants Suspended in Oil Toward Controlling the Wear Performance of a Cast Iron

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
B. K. Prasad ◽  
S. Rathod ◽  
M. S. Yadav ◽  
O. P. Modi
Keyword(s):  
Cast Iron ◽  
Wear Rate ◽  
Solid Lubricant ◽  
Frictional Heating ◽  
Applied Pressure ◽  
Solid Lubricants ◽  
Specific Response ◽  
Test Environment ◽  
Wear Performance ◽  
Wear Response

The present investigation deals with the examination of the sliding wear response of a gray cast iron in oil lubricated condition over a range of applied pressure. The composition of the oil lubricant was changed by adding 5.26 wt % solid lubricant particles. The solid lubricants used were graphite, talc, MoS2, and lead. The observed wear response of the samples has been substantiated through the characteristics of wear surfaces, subsurface regions, and debris particles and discussed in terms of specific response of different microconstituents, such as ferrite, pearlite, and graphite present therein. Operating wear mechanisms were assessed through the observed features of wear surfaces, subsurface regions, and debris. The wear rate increased with applied pressure. The slope of the wear rate versus pressure plots was low up to a critical pressure. This was followed by a sudden rise in the slope at higher pressures irrespective of the test environment. The frictional heating was affected by pressure in a manner practically identical to that of the wear rate. The presence of graphite, MoS2, and lead in the oil led to a substantial decrease in the wear rate and severity of frictional heating. The oil plus lead lubricant mixture was observed to offer best results in terms of reduced wear rate and lower frictional heating. This was followed by the ones containing graphite and MoS2 while talc caused the wear performance of the samples to deteriorate over that of the bare oil. However, the severity of frictional heating decreased in general in the oil containing solid lubricant particles. Seizure brought about high frictional heating and wear rate.

Relationships between the thermal stability, friction, and wear properties of reactively sputtered Si–aC:H thin films

2002 ◽  
Vol 17 (11) ◽  
pp. 2888-2896 ◽  
Author(s):  
Ryan D. Evans ◽  
Gary L. Doll ◽  
Jeffrey T. Glass
Keyword(s):  
Thin Films ◽  
Thermal Stability ◽  
Friction And Wear ◽  
Dry Sliding ◽  
Wear Properties ◽  
Wear Performance ◽  
Transfer Films ◽  
Friction And Wear Properties ◽  
Pin On Disk ◽  
Thermal Stability Of

The friction and wear performance were correlated with the thermal stability of reactively sputtered Si–aC:H thin films containing various Si and H concentrations. The average steady-state friction coefficients as measured by dry sliding pin-on-disk tests decreased with increasing Si and H content. Furthermore, the films with high Si and H formed thick transfer films as compared to the films with little or no Si and H content. Minimums in average ball abrasion rate and average film wear rate were observed at the Si/C = 0.10 film composition. The most intense and distinct “graphitic” Raman peaks were collected from the Si/C = 0.10 transfer film debris. In addition, the Si/C = 0.10 film also had the most distinguishable graphitic Raman signature after annealing in air at 500 °C compared to the other Si–aC:H films, suggesting a possible relationship between the nature of transfer films resulting from dry sliding in air and the bulk films that were annealed in air.

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