Hydrothermal growth of Ni-based coatings on copper substrates

Fang Liu and Yong Zhang School of Materials Science and Engineering,Dalian Jiaotong University,Dalian 116028,China

摘 要：Ni-based coatings were deposited on copper substrates by a hydrothermal approach.The results showed that a Ni-based cellular microstructure was bridged by "fiber-like" products.A high microhardness of Hv 856 was achieved after 400℃ heat treatment,which is nine times that of copper substrates（Hv 95）.Nucleation,growth,and fusion of Ni atoms along the linear direction,induced by a linear-type citrate-metal structural "molecule template",led to in-situ growth of Ni-based fibers between cellular microspheres.After 400℃ heat treatment,the precipitation of NiP and Ni3P hard phases contributed to the high microhardness of Ni-based coatings.

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