1 Key Laboratory of Advanced Structural Materials and Application Technology of Jiangsu Province, Nanjing 211167, China 2 School of Materials Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Ni based composite coatings containing micro-and nano-TiC particles were prepared by dipulse electrodepositing in Watt's nickel solution.The effect of nano-TiC content in the solution on the micro morphology, microstructure, hardness and wear resistance of composite coatings was investigated.The results show that the agglomeration of composite coatings of Ni-TiC appears and the density decreases by adding nano-TiC particles in electrolyte, the microstructure of coatings consists of Ni and TiC phase; the hardness of composite coatings firstly increases and then decreases with increasing the content of nano-TiC in bath; however, the friction coefficient of coatings firstly decreases and then increases, the maximum value of microhardness of coating with 445HV is achieved when containing 6.0g/L nano-TiC in bath, at the same time, the smaller friction coefficient of coating is about 0.22.The wear mechanism is mainly abrasive wear.Coatings under the oxidation condition at 900℃ for 100h show the best oxidation resistance which the mass gain with 6.828mg/cm2 is 1/2 of that of micro-TiC composite coating.
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