Fabrication of W–Cu/CeO2 composites with excellent electric conductivity and high strength prepared from copper-coated tungsten and Ceria powders

W–Cu/CeO2 composites with excellent electric conductivity and high strength have been prepared from Cu-coated W and CeO2 composite powders. The phase and morphology of W–Cu/CeO2 composite powders and W–Cu/CeO2 composites are characterized by x-ray diffraction, field-emission scanning electron micros...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2015-02, Vol.626, p.61-66
Main Authors: Lu, Ze-Long, Luo, Lai-Ma, Chen, Jing-Bo, Huang, Xin-Min, Cheng, Ji-Gui, Wu, Yu-Cheng
Format: Article
Language:English
Subjects:
Alloys
Bend strength
BEND ULTIMATE STRENGTH
CERIUM ALLOYS (0 TO 50 CE)
COATINGS
Copper
Cu-coated CeO2 composite powders
Density
Electric conductivity
Electrical conductivity
Electroless plating
HARDNESS
High strength
Microhardness
Microstructure
MICROSTRUCTURES
POWDERS
W–Cu/CeO2 composites
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Summary:W–Cu/CeO2 composites with excellent electric conductivity and high strength have been prepared from Cu-coated W and CeO2 composite powders. The phase and morphology of W–Cu/CeO2 composite powders and W–Cu/CeO2 composites are characterized by x-ray diffraction, field-emission scanning electron microscopy and energy-dispersive spectroscopy. The relative density, microhardness, electrical conductivity, and bending strength of the sintered samples are also examined. Results show that the addition of Cu-coated CeO2 composite powders significantly affect the microstructure and properties of W–Cu composite materials. The low content of CeO2 (0, 0.25wt%, 0.5wt%) have made an inconspicuous impression on bending strength and microhardness. While the composites still exhibit a best bending strength of 1102.7MPa, which is higher than the national standard (W–Cu) of 39.28%. When the addition of CeO2 reached 0.25wt%, the composites show the best electric conductivity of 69.41% IACS, which is higher than the national standard (W–Cu) of 65.26%. However, with further addition of CeO2 to 1wt% and 2wt%, the composites show numerous pores and aggregated particles, which is prone to damage the properties of the alloys.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2014.12.047