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.

Tribological Properties of Ti-Al Alloy Self-Lubricating Composite Materials

2013 ◽  
Vol 842 ◽  
pp. 114-117
Author(s):  
Xiu Ling Wang ◽  
Li Ying Yang ◽  
Shou Ren Wang ◽  
Yi Zhang
Keyword(s):  
Sliding Wear ◽  
Solid Lubricant ◽  
Al Alloy ◽  
Test Results ◽  
Weight Percentage ◽  
Dry Conditions ◽  
Hot Pressing Sintering ◽  
Worn Surface ◽  
Wear Tests ◽  
Self Lubricating Composites

A series of Ti-48Al-2Cr-2Nb/62%BaF2-38%CaF2 (CB) self-lubricating composites with addition of different weight percentage of solid lubricant were prepared by vacuum hot pressing sintering. Sliding wear tests against 45#steel were performed on the specimen in dry conditions, worn morphology was observed by the scanning electron microscope (SEM). The test results show that when addition of solid lubricant weight percentage is 10%, the worn surface of the composites is most smooth.The main wear mechanisms of Ti-48Al-2Cr-2Nb/62%BaF2-38%CaF2 composite are abrasive wear and adherent wear.

Friction and wear behaviors of the carbide tools embedded with solid lubricants in sliding wear tests and in dry cutting processes

Wear ◽  
2011 ◽  
Vol 270 (9-10) ◽  
pp. 666-674 ◽  
Author(s):  
Jianxin Deng ◽  
Wenlong Song ◽  
Hui Zhang ◽  
Pei Yan ◽  
Aihua Liu
Keyword(s):  
Sliding Wear ◽  
Friction And Wear ◽  
Solid Lubricants ◽  
Dry Cutting ◽  
Cutting Processes ◽  
Wear Tests

Patterning of Hard Coatings for Incorporation of Solid Lubricant Microreservoirs

2007 ◽  
Vol 1054 ◽  
Author(s):  
Canan G Guleryuz ◽  
James Krzanowski
Keyword(s):  
Solid Lubricant ◽  
Substrate Surface ◽  
Solid Lubricants ◽  
Tribological Performance ◽  
Hard Coatings ◽  
Hard Coating ◽  
Conventional Photolithography ◽  
Pin On Disk ◽  
Disk Test ◽  
Microscopy Examination

ABSTRACTHard coatings containing microscopic reservoirs for solid lubricant storage have the potential to advance the development of dry, self-lubricating coatings. In the present study we have investigated several methods for fabricating hard coatings that incorporate microscopic reservoirs. These methods all involve the use of placeholders on the substrate surface that are later removed after deposition of the hard coating. One method uses a solution containing ceramic beads, while the second method uses conventional photolithography methods. Coatings using both of these methods were fabricated using TiN as the hard coating. The effectiveness of the microreservoirs for solid lubricant storage was examined by conducting pin-on-disk test using various solid lubricants, including graphite and indium. The performance of coatings with random arrangements of microreservoirs was scattered while samples with the ordered arrangements of microreservoirs all performed well. Optical microscopy examination of the wear tracks showed the microreservoirs were generally successful at trapping the graphite lubricant during wear. With a sufficient density and appropriate distribution of the microreservoirs, the significant improvements in tribological performance can be realized.

Multi-metal sulfide pre-blend combination on the tribological performance of the brake friction material

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sathickbasha K. ◽  
Selvakumar A.S. ◽  
Surya Rajan Balachandran ◽  
Hariharasakthisudhan P.
Keyword(s):  
Peer Review ◽  
Test Procedure ◽  
Metal Sulfide ◽  
Solid Lubricants ◽  
Tribological Performance ◽  
Maximum Temperature ◽  
Brake Pad ◽  
Wear Performance ◽  
Content Type ◽  
Brake Pads

Purpose The purpose of this study is the influence of various combinations of metal sulfides on the tribological performance of brake pads. Design/methodology/approach Three brake pads were prepared using the possible combination of any two of the solid lubricants from Bismuth trisulfide (Bi2S3); Tin disulfide (SnS2) and Antimony trisulfide (Sb2S3) are chosen and blended with molybdenum disulfide and graphite. The tribological performance was compared with the brake pad containing aftermarket sulfide mixture. The tribological performance parameters such as performance coefficient of friction, fade percent, recovery percent, wear thickness loss, time is taken to reach the maximum temperature and fluctuation of friction were investigated using Chase tribometer adopting IS 2742 Part-4 (1994) test procedure. Findings The friction stability of the brake pad with 4Wt% of MoS2, Bi2S3 and SnS2 was observed to be better, but it showed poor wear performance and aggressive towards the rotor, whereas the brake pad contained 4Wt% of MoS2, Bi2S3 and Sb2S3 exhibited improved wear performance. Originality/value This paper explains the influence of the combination of multiple metal sulfide in the tribological performance of the copper-free brake friction composite. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0249/

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.

scholarly journals Towards developing robust solid lubricant operable in multifarious environments

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Aditya V. Ayyagari ◽  
Kalyan C. Mutyala ◽  
Anirudha V. Sumant
Keyword(s):  
Solid Lubricant ◽  
Spray Coating ◽  
Solid Lubricants ◽  
Carbon Films ◽  
Tribological Performance ◽  
Friction Behavior ◽  
Humid Atmosphere ◽  
Wear Friction ◽  
Friction Performance ◽  
Sliding Test

Abstract Conventional solid lubricants such as MoS2, graphite, or diamond-like carbon films demonstrate excellent tribological performance but only in specific environments due to their inherent materials properties. This limitation prohibits using these solid lubricants in environments that change dynamically. This study presents the results of a novel solid lubricant that was developed using a combination of solution-processed 2D-molybdenum disulfide and graphene-oxide (GO) that can be deposited on to stainless steel substrates using a simple spray-coating technique and show exceptional performance in multifarious environments namely, ambient (humid) atmosphere, dry nitrogen, and vacuum. The tribological performance of the coatings was evaluated using a ball-on-disc sliding test and demonstrated an excellent wear/friction performance in all environments and coating survived even after 44 km of linear sliding. Transmission electron microscopy and Raman spectroscopy analysis of the tribolayers suggested in-operando friction-induced re-orientation of MoS2 layers that were protected by GO layers and, an absence of MoOx peaks indicate a strong resistance to intercalation with moisture and oxygen. The simplicity and robustness of the hybrid MoS2–GO solid lubricant in mitigating wear-friction behavior of steel-on-steel tribopair in a multifarious environment is a game-changing and is promising for various applications.

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