A study of the characteristic of NicBN composite electric-deposition

• Main Authors: Chung-Chuan Huang, 黃重銓
• Other Authors: Shi-Yung Chiou
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/09030914086477274374

碩士 === 國立高雄應用科技大學 === 模具工程系 === 98 === A co-deposition of nano/microsized cBN particles within electrodeposition nickel coating in nickel sulfamate bath was investigated. The process variables such as surfactant, pH value, current density, cBN concentration in bath and stirring speed were controlled to obtain different cBN contents in nickel layers. The X-ray diffraction（XRD） and scanning electron microscope（SEM）and EDS mode were used to analyze the microstructure of cBN and the morphologies of cBN particles dispersed in nickel layers. The hardness tester and anti-abrasion tester were applied for evaluating the mechanical properties for the co-deposition of cBN particle in nickel layer. The results indicated the surfactant of CTAB has significant effect on cBN particles dispersion in nickel layer in addition to the effects of pH values, current density, cBN concentration in bath and stirring speed. In the co-deposition of nickel sulfamate bath without CTAB, the cBN contents increase with increasing pH values and disperse uniformly at current density of 2 ASD. The effect of cBN concentration in bath shows that the cBN contents in nickel layer increase with cBN concentration in bath while the cBN concentration below 3g/l and decrease with cBN concentration in bath while cBN concentration above 3g/l. The increasing stirring speeds cause the increment of cBN contents in nickel layer while below 550 rpm stirring speeds and the decrease of cBN contents in nickel layer while above 550 rpm stirring speeds. In the co-deposition of nickel sulfamate with CTAB, the cBN contents in nickel layers increase with cBN concentration in bath while decrease with pH value and current density, and the effects of stirring speed show the cBN contents increase with stirring speed below 255 rpm of stirring speed and decrease with stirring speed above 255 rpm of stirring speed. The anti-abrasion test appears that the addition of CTAB improves the anti-abrasion capacity of co-deposition of cBN particles in nickel layer due to the fine dispersion of nano/microsized cBN particles. The statistics results show the priority of process variable effects follows in sequence of pH value, current density, stirring speed and cBN concentration in bath while no CTAB addition whereas in sequence of current density, cBN concentration in bath, pH value and stirring speed while CTAB addition. The most prominent interference extent among process variables from statistics analysis comes from current density and stirring speed while no CTAB in bath whereas from current density and pH value while CTAB addition in bath. Keywords：co-deposition、nano/microsized cBN particles、nickel sulfamate、CTAB surfactant