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Lubrication of Distribution Electrical Equipment
Published in Bella H. Chudnovsky, Transmission, Distribution, and Renewable Energy Generation Power Equipment, 2017
The burnished coating is frequently used as a lubricant in applications such as metal forming dies, threaded parts, sleeve bearings, liquid oxygen valves, and electrical contacts in relays and switches. In these applications, the MoS2 burnished coating can be produced from loose powder, dispersions, wire brushing, or even “sandblasted” onto the metal surface to form a thin adherent film [55]. Solid MoS2 burnished film provides high load-carrying capacity, very low friction and wear rate. Also, it is one of the best techniques for lubrication bearings with very small clearances in air.
Selection and Application of Solid Lubricants as Friction Modifiers
Published in Leslie R. Rudnick, Lubricant Additives, 2017
The effectiveness of MoS2 improves as contact forces increase on the lubricated surface. Burnished surfaces exhibit coefficient of friction reduction as a function of increasing contact forces [7]. In contrast, graphite does not necessarily exhibit this behavior. The frictional property of MoS2 systems has been reported to be generally better than graphite in many instances, up to the service temperature limitations for the lubricant.
Effect of burnishing on Inconel 718 workpiece surface heated by infrared radiation
Published in Materials and Manufacturing Processes, 2021
Samuel José Casarin, Luiz Eduardo De Angelo Sanchez, Eduardo Carlos Bianchi, Vicente Luiz Scalon, Renan Luis Fragelli, Eduardo Luiz De Godoi, Maria Da Penha Cindra Fonseca
Surface roughness, roundness deviation, Vickers microhardness and residual stress on the burnished surface were measured after burnishing tests. For this aim the following resources were employed: Taylor Hobson Surtronic 3+ surface roughness tester under cutoff of 0.8 mm; Taylor Hobson Talyrond 31 roundness meter (the internal algorithm of equipment used in the evaluation of roundness deviation is established by ISO 1281 standard named “Geometrical product specifications (GPS) – Roundness”). The measurement was made in three locals on the burnished workpiece surface and the final value was obtained by the arithmetic average of these three values. Mitutoyo MicroWizard 1.04 microhardness tester with load of 20 g and charge application time of 10 s (according to ASTM E384 – 17 Standard Test Method for Microindentation Hardness of Materials) was applied. Vickers microhardness measurements on the subsurface were performed from 0.019 mm (190 μm) of the burnished surface. The residual stress measurements were performed in a Stresstech Xstress3000 analyzer according to the technique of X-ray diffraction using the sin2Ѱ method.
Effect of burnishing on HVOF coated boiler steel against hot corrosion in actual boiler environment
Published in Surface Engineering, 2023
Atul Agnihotri, Sukhminderbir Singh Kalsi, Harmesh Kansal
In this study, the hot-corrosion behaviour of uncoated, as-sprayed, and burnished-coated specimens are analysed. The experiments were carried out to determine the influence of burnishing on the hot-corrosion behaviour of the HVOF thermal spray coating (WC-CrC-Ni). Considering the findings of the current research, the following conclusion can be drawn: The conditions in an actual environment are more severe ensuing in the thickness loss of specimen. The variation in the behaviour of hot-corrosion performance of deposited coating might be attributed to the diffusion of basic elements of substrate alloy at a higher temperature. Negligible loss in scale thickness and no internal depth of corrosion were noticed in burnished-coated specimens.The coated specimen supplemented with burnishing practice has performed very well in the boiler environmental conditions. Coatings followed by burnishing have efficaciously transfused the necessary protection against hot-corrosion to base alloys.HVOF coatings had strong integrity with the substrate, but burnishing improved intactness and prevented the infiltration of degrading species via exposed pores, making them oxidation resistant. Further, they also indicated negligible spallation of the oxide scale.Burnished WC-CrC-Ni-coatings provide the highest hot-corrosion resistance. The chromium oxide formation at nickel affluent splat borders of WC-CrC-Ni-coating prevents an inward penetration of oxygen and corroding species towards base metal alloy.Burnished coatings may be used in fluidized beds, gas turbines, steam turbines, industrial waste incinerators, and internal combustion engines to defend against hot corrosion.Burnished coatings may extend the life of components without affecting thermal efficiency. Thin, adherent coatings don't add much weight to coated parts.