(1. 南京工程学院 江苏省先进结构材料及应用技术重点实验室，南京 211167；
2. 南京工程学院 材料工程学院，南京 211167)
摘 要: 采用双脉冲复合电镀技术，在瓦特型镀液中，制备了含微/纳米SiC颗粒的Ni基复合镀层，研究镀液中纳米SiC添加量对复合镀层微观形貌、摩擦性能和抗氧化性能的影响。结果表明：在SiC颗粒(5 μm)浓度为10 g/L的镀液中，添加纳米SiC和Ni-SiC复合镀层镍择优取向由晶面(200)转变为晶面(111)；当SiC(40 μm )浓度为4.0 g/L时，复合镀层显微硬度最大，为456 HV；复合镀层摩擦因数最小，平均值为0.28，为微米复合镀层的1/2；经900 ℃氧化100 h后，氧化质量增加为6.025 mg/cm2，为微米复合镀层的1/3。
关键字: Ni-SiC复合镀层；微米SiC；耐磨；抗氧化性能
（1. Key Laboratory of Advanced Structural Materials and Application Technology of Jiangsu Province,
Nanjing Institute of Technology, Nanjing 211167, China;
2. School of Materials Engineering, Nanjing Institute of Technology, Nanjing 211167, China）
Abstract:Ni based composite coatings containing micro- and nano-SiC particles were prepared by dipulse electrodepositing in watts nickel solution. The effect of the nano-SiC content in the solution on the micro morphology, wear and oxidation resistance of the coating was investigated. The results show that the preferred orientation the Ni crystallites transits from (200) crystal face to (111) crystal face of Ni-SiC composite coatings when adding nano-SiC in electrolyte with SiC (5 μm) content of 10 g/L. the maximum value of microhardness of coating with 456 HV is obtained, and the smallest coefficient of coating with 0.28 is about 1/2 than that of micro-SiC composite coating when adding 4.0 g/L nano-SiC in electrolyte, and shows the best oxidation resistance with the mass gain of 6.025 mg/cm2 is about 1/3 than that of micro-SiC composite coating after oxidation at 900 ℃ for 100 h.
Key words: Ni-SiC composite coating; micro-SiC; wear resistance; oxidation resistance property
