Effect of reinforcing submicron SiC particles on the wear process of electrolytic NiP coatings |
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Authors: | I R Aslanyan J -P Celis L Sh Shuster |
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Affiliation: | 1.Ufa State Aviation Technical University,Ufa,Russia;2.Departement Metaalkunde en Toegepaste Materiaalkunde,Katholieke Universiteit Leuven,Leuven,Belgium |
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Abstract: | The effect of submicron silicon carbide frictional strengthening admixtures and heat treatment on the wear process of nickel
phosphide coatings obtained by electrolytic deposition is studied. Despite the heat treatment and admixtures of silicon carbides,
the wear of the coatings is of abrasion-oxidizing nature; in the case of NiP-SiC composite coatings, the oxide films formed
during the friction process do not exhibit the shield effect; these films show a considerable effect on the wear of silicon-free
NiP coatings. The silicon carbide admixtures increase the hardness of the electrolytic coatings but prevent the oxide films
formed in the frictional process from attaching to the contact surface. Annealing of the coating reduces the wear rate. In
the process of heat treatment, the crystalline phase Ni3P is formed in the NiP matrix, increasing the coating hardness. At the same time, in the process of annealing of NiP-SiC composite
coatings, the NiP matrix cracks around the silicon carbides. As a result, silicon carbides are extracted in the frictional
process and the wear rate of the NiP-SiC composite coating grows. |
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