Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5451638 | Journal of Materials Science & Technology | 2016 | 22 Pages |
Abstract
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, pH 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 16âA dmâ2, with a load of 10âg dmâ3 WC powders and a stirring speed of 600âr minâ1 at an operation temperature of 40â±â2â°C, and 90% current efficiency was obtained with a single deposition pulse of 1.5âmin and single stirring pulse of 2âmin during 12âmin efficient electrodeposition time. The uniformly distributed WC/Co powders could be obtained in the cobalt electrolyte containing 300âmg dmâ3 PEG-2000. The spherical cobalt grains coated WC particles were prepared in the pH 4â5 electrolyte at the Co deposition rate of 0.58âg minâ1. A practical process for high efficient production of WC/Co powders by electrodeposition was developed in the present work.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Chemistry
Authors
Huan Zhong, Yuejun Ouyang, Gang Yu, Bonian Hu, Dalong Yan,