Study on characteristics of Ni-W-B composites containing CeO2 nano-particles prepared by pulse electrodeposition |
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Authors: | WANG Junli XU Ruidong ZHANG Yuzhi |
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Affiliation: | 1.Research Center for Analysis and Measurement,Kunming University of Science and Technology,Kunming 650093,China;2.Faculty of Metallurgical and Energy En-gineering,Kunming University of Science and Technology,Kunming 650093,China;3.Key Laboratory of Inorganic Coating Materials,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China) |
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Abstract: | Ni-W-B composites containing CeO2 nano-particles on the surface of 45 steel were prepared by pulse electrodeposition,and the in-fluence of pulse frequency,pulse duty circle and heat treatment temperature on the structures and properties were investigated.The results in-dicated that the pulse co-deposition of Ni,W,B and CeO2 nano-particles led to Ni-W-B/CeO2 composites possessing higher microhardness and better wear resistance when heat-treated at 400 oC for 1 h.The microhardness of 636 HV and the deposition rate of 0.0281 mm/h of the as-deposited alloy were the highest at pulse frequency of 1000 Hz,pulse duty circle of 10% and pulse average current density of 10 A/dm2.The composites were mainly in the amorphous state and were partially crystallized as-deposited,and the crystallization trend was strength-ened when heat-treated at 400 oC.Decreasing pulse duty cycle from 75% to 10% was favorable to the refinement in grain structures and im-provement of microstructures.The crystal sizes of the composites were smaller by means of pulse electrodeposition. |
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Keywords: | pulse electrodeposition composites characteristics rare earths |
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