Title :
Study on micro-hardness of Ni-Co-SiC nano-composite coatings by high-frequency pulse
Author :
Cen, Li ; Yunhua, Xu
Author_Institution :
Sch. of Mech. & Electron. Control Eng., Beijing Jiaotong Univ., Beijing, China
Abstract :
Ni-Co-SiC nano-composite coatings were prepared by pulse electroplating at high frequency (20-140 kHz). The effects of pulse frequency, mass concentration of SiC and heat treatment temperature on the morphology and micro-hardness of deposit were studied. The Ni-Co-SiC obtained by high-frequency pulse electroplating features higher compactness, better uniformity, lower porosity and higher micro-hardness as compared with that DC electroplated. Ni-Co-SiC coating is increased with increasing pulse frequency or CoSO4 content in plating bath. The micro-hardness increased with increasing heat treatment temperature from 200 to 400°C, but decreased with further increasing temperature over 400°C. The micro-hardness of deposit prepared at pulse frequency 120 kHz and 140 kHz is decreased with increasing heat treatment temperature.
Keywords :
coatings; cobalt; electroplating; heat treatment; microhardness; nanocomposites; nickel; porosity; silicon compounds; Ni-Co-SiC; frequency 20 kHz to 140 kHz; heat treatment temperature; high-frequency pulse; high-frequency pulse electroplating; mass concentration; microhardness; nanocomposite coatings; plating bath; porosity; pulse frequency; temperature 200 degC to 400 degC; Coatings; Corrosion; Frequency; Heat treatment; Pulsed power supplies; Scanning electron microscopy; Silicon carbide; Surface morphology; Surface resistance; Temperature;
Conference_Titel :
Nanoelectronics Conference (INEC), 2010 3rd International
Conference_Location :
Hong Kong
Print_ISBN :
978-1-4244-3543-2
Electronic_ISBN :
978-1-4244-3544-9
DOI :
10.1109/INEC.2010.5425061
