Effect of Nano-TiC Particles on Microstructure and Properties of Ni-TiC Composite Coatings
WANG Hong-xing1,2, MAO Xiang-yang1,2, SHEN Tong1,2, ZHANG Yue1,2
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
Abstract：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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