ПРОГРЕССИВНЫЕ ТЕХНОЛОГИИ В МАШИНОСТРОЕНИИ THE ADVANCED TECHNOLOGIES IN MECHANICAL ENGINEERING УДК 621.162 THE NANO-STRUCTURED © Benigna Szeptycka 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. <...> The roughness of the nickel foils was evaluated using a TR 100 prod. <...> 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. <...> INTRODUCTION The ratio of grain boundaries to grains in the nanocrystalline metal coatings play an important role in determining mechanical properties and nano-structured materials can provide coatings with the desired engineering properties. <...> Inert solid particles may be codeposited electrochemically with metals, forming metalmatrix composites (MMC) that have been used widely in industry where hard, wear and corrosion resistant materials are needed. <...> Silicon carbide particles can be co-deposited successfully with nickel [1, 2, 3, 4] and their high wear resistance and the low cost of ceramic powder causes that Ni-SiC composite coatings have been investigated to the greatest extent and successfully commercialized for the protection of friction parts. <...> In the current study we examined the relationship between the structure of nanocrystalline coatings NiSiC, their microhardness, wear resistance and other properties, such as those that may be important in the sliding wear. <...> EXPERIMENTAL To study the electrodeposition of nickel coatings, a low-concentration nickel-plating bath containing 0.45 M NiSO4 used. <...> Additives, sodium o-benzosulfamide (saccharin, SA) and butyne-2-diol-1,4 (BD) were included in the bath either singly or together. <...> The starting agent SRN with surface active compound 7H2 O, 0.3 M NiCl2 .6H2 O, 0.85 M H3 BO3 was was also used in the bath. <...> Dispersed phase <...>