Flower-like Ni-Co coating was deposited on copper substrate by a hydrothermal approach. Detailed experimental result revealed that, the achieved Ni-Co coating exhibited flower-like morphology. During sliding wear tests, the volume loss of Ni-Co coating was 20.4 % of copper substrate, obviously increasing the wear properties of copper substrate. During hydrothermal reactions, convective flows existed. Moreover, water jets were produced by bubble collapse. Interaction of convective flows and

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... jets resulted in vortex flows. Driven by the flowing force of helical vortex, Ni and Co plates were assembled to flower-like Ni-Co architectures.