Preparation and Characterization of Nickel Nano-Al2O3 Composite Coatings by Sediment Co-deposition and in High Magnetic Field
(0) Ni/Al2O3 composite coatings were prepared by using conventional electroplating (CEP) technique, sediment co-deposition (SCD) technique and imposing a high magnetic field in the direction parallel to an electrolytic current. The surface morphology, microstructure, hardness, wear resistance of resulting composites and effects of magnetic field on the content of particles were investigated. The results show that the preferential orientation is modified from (200) plane to (111) plane. The microhardness of Ni/Al2O3 composite coatings in the SCD technique are higher than that of the CEP technique and pure Ni coating. The wear rate of the Ni/Al2O3 composite coating fabricated via SCD technique with 10 g/l nano-Al2O3 particles in plating bath is approximately one order of magnitude lower than that of pure Ni coating. Wear resistance for SCD obtained composite coatings is superior to that obtained by the CEP technique. The wear mechanism of pure Ni and nickel nano-Al2O3 composite coatings are adhesive wear and abrasive wear, respectively. The amounts of nano-Al2O3 particles in the composite coating increased with increasing of magnetic flux density and reached a maximum value at 8 T. The microhardness and wear resistance of the nanocomposite coatings also enhanced with increasing of magnetic flux density as compared to that of pure Ni coating fabricated in the absence of magnetic field.
characterization composite coating nano-Al2O3 magnetic field
Jian-bo Sun Qiu-yuan Feng Zhi-ming Yan Ting-ju Li
School of Materials Science and Engineering,Dalian University of Technology,Dalian 116085,Liaoning,China
国际会议
上海
英文
2008-10-13（万方平台首次上网日期，不代表论文的发表时间）