脉冲电镀中脉冲参数对镍镀层显微硬度的影响 - 中国表面工程.pdfVIP

18 5 Vol.18 No.5 2005 10 CHINA SURFACE ENGINEERING October 2005 5 43 450002 watt SEMX XRD 10.3 nm 900 MPa 2.5 1.5 : ; ; TG174.441 A 1007−9289(2005)05−0043−04 Application Study of Nano-Nickel Coating Produced by Pulse Electrodeposit in Manufacture of Diamond Tool LI Zhao-mei HANG Yu-bi LI Yun-dong (Mechanical and Electrical Engineering College, Henan Agricultural University, Zhengzhou 450002, China) Abstract: Nano-crystal Nickel deposits were obtained by the traditional Watt nickel plating technique using pulse electro deposition. The relationship between pulse parameters and the morphology and texture of the Ni- coatings was studies by means of SEM and XRD. The analysis results showed that the micro-morphology displays a lumpy structure, the mean grain size is 10.6nm. With the decrease of duty cycle, the grain size is falling. The effect of pulse parameters on micro-hardness and tensile strength were investigated, the results showed that the biggest micro-hardness and tensile strength can reach to 591 HV and 900Mpa, about 4 and 2.5 times that of normal nickel layer. The optimized pulse parameters were obtained by the orthogonal experiments and had been applied in the manufacture of diamond tool successfully. Key words: nano-crystalline Nickel pulse parameters tensile strength diamond tool 0 SMD−30 HX−500