Preparation of Core-Shell Structured Cobalt Coated Tungsten Carbide Composite Powders by Intermittent Electrodeposition
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2016年第11期
论文作者：Huan Zhong Yuejun Ouyang Gang Yu Bonian Hu Dalong Yan
文章页码：1171 - 1178
摘 要：Core-shell structured cobalt coated tungsten carbide（WC/Co） composite powders were prepared by intermittent electrodeposition. The influence of process parameters such as current density, single deposition pulse, p H value and surfactants on the formation of WC/Co was investigated and characterized by scanning electron microscopy（SEM）, electrochemical station, acidometer and X-ray diffraction（XRD） techniques.The composite powders with 54% cobalt content were fabricated at a current density of 16 A dm-2, with a load of 10 g dm-3WC powders and a stirring speed of 600 r min-1at an operation temperature of 40 ± 2 °C,and 90% current efficiency was obtained with a single deposition pulse of 1.5 min and single stirring pulse of 2 min during 12 min efficient electrodeposition time. The uniformly distributed WC/Co powders could be obtained in the cobalt electrolyte containing 300 mg dm-3PEG-2000. The spherical cobalt grains coated WC particles were prepared in the p H 4-5 electrolyte at the Co deposition rate of 0.58 g min-1. A practical process for high efficient production of WC/Co powders by electrodeposition was developed in the present work.
Huan Zhong1，Yuejun Ouyang1,2，Gang Yu1，Bonian Hu3，Dalong Yan1
1. State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University2. Huaihua Key Laboratory of Functional Inorganic & Polymeric Materials, Huaihua University3. Department of Materials and Chemical Engineering, Hunan Institute of Technology
摘 要：Core-shell structured cobalt coated tungsten carbide（WC/Co） composite powders were prepared by intermittent electrodeposition. The influence of process parameters such as current density, single deposition pulse, p H value and surfactants on the formation of WC/Co was investigated and characterized by scanning electron microscopy（SEM）, electrochemical station, acidometer and X-ray diffraction（XRD） techniques.The composite powders with 54% cobalt content were fabricated at a current density of 16 A dm-2, with a load of 10 g dm-3WC powders and a stirring speed of 600 r min-1at an operation temperature of 40 ± 2 °C,and 90% current efficiency was obtained with a single deposition pulse of 1.5 min and single stirring pulse of 2 min during 12 min efficient electrodeposition time. The uniformly distributed WC/Co powders could be obtained in the cobalt electrolyte containing 300 mg dm-3PEG-2000. The spherical cobalt grains coated WC particles were prepared in the p H 4-5 electrolyte at the Co deposition rate of 0.58 g min-1. A practical process for high efficient production of WC/Co powders by electrodeposition was developed in the present work.
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