期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 15, 期 5, 页码 1041-1048出版社
SPRINGER
DOI: 10.1007/s10008-011-1348-1
关键词
Electro-co-deposition; Ultrasound; Composites; Cross-section; Microstructure; Residual stress; Microhardness; Wear
NiCo-Al2O3 composite coatings were prepared by electrodeposition in a sulfamate plating bath containing Al2O3 particles to be co-deposited under sonication. For reliable determination of the microstructure, detailed studies on composite cross-sections were carried out by energy-dispersive spectrometer (matrix composition, particle content) and FE-SEM/electron backscattered diffraction data (particle distribution, grain size), accompanied by XRD analyses concerning texture, lattice parameter, grain size, and residual stress. The NiCo matrix with a Co/Co + Ni ratio up to 0.4 is a face-centered cubic solid solution with < 100 > and < 110 > fiber textures. The distribution of the particles (size 250 nm) was well-dispersed and enhanced up to 15 wt.% by ultrasound application during plating. Vickers hardness increased up to 50% by dispersion hardening. First-order residual stress in the matrix increased with rising Co content, thus decreasing wear resistance and revealing the complex of composite properties with partially opposite effects.
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