期刊
SURFACE & COATINGS TECHNOLOGY
卷 393, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2020.125779
关键词
Ni-W/ZrO2 nanocomposites; Electrochemical deposition; Heat treatment; Microstructure transformation; Wear and corrosion resistance
资金
- Ministry of Science and Higher Education of Poland as the grant of the Polish Academy of Sciences
Metal matrix composite (MMC) coatings of zirconium oxide (ZrO2) in nanocrystalline Ni-W alloy were obtained by ultrasound assisted direct current electrodeposition from aqueous plating electrolyte. In the present study, effects of the heat treatment (in the range of 400 degrees C-800 degrees C, in argon atmosphere) on the microstructure and physicochemical properties of hard Ni-W/ZrO2 coatings deposited on steel substrates were investigated. It was found that thermal treatment considerably affected the microstructure of Ni-W/ZrO2 coatings, including phase compositions, surface morphology and grain size. Microstructure features of annealed composite coatings were correlated to tribological and mechanical properties. A significant improvement in hardness (12 GPa) and wear index (0.56 mm(3)/Nm) of Ni-W/ZrO2 nanocomposites was achieved by thermal treatment at 500 degrees C compared to as-deposited coatings (8 GPa and 1.5 mm(3)/Nm, respectively). At higher temperature (about 600 degrees C), a tendency towards phase separation was observed and iron diffusion from the substrate to the composite coating layer became evident.
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