Improved wear performance by the incorporation of solid lubricants during thermal spraying |
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Authors: | Basil R Marple Joël Voyer |
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Affiliation: | (1) Industrial Materials Institute, National Research Council of Canada, J4B 6Y4 Boucherville, PQ, Canada |
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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 (FEP) 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 (HVOF) 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 to 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 2) were obtained for the best performing compositions, as compared to couples in which the coating
contained no solid lubricant. |
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Keywords: | coefficient of friction high velocity oxy-fuel sliding wear solid lubricant teflon tungsten carbide-based cermet |
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