THE NANO-STRUCTURED COATINGS AND THEIR TRIBOLOGICAL PROPERTIES

The nanocrystalline composite electrochemical coatings prepared with nickel matrix and SiC particles were investigated. Nickel plating bath of low nickel(II) concentration (0.75 M) with organic compounds and dispersed SiC particles content was used for coatings electrodeposition. SiC particles content was determined gravimetrically. The roughness of the nickel foils was evaluated using a TR 100 prod. Elcometr Instruments Ltd. profilograph. The microhardness of the deposited layers was measured using a Vickers’ method at a load of 0.01 kG. Siemens D500 X-ray diffractometer with radiation was used to determine the dimension of nickel crystallites. The size of nickel crystallites in the Ni-SiC coatings was from 17.5 to 55.5 nm. The wear resistance increase with increasing of the microhardness of the nanocomposite Ni-SiC coatings.

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