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| Effect of ball milling time on the powder morphology and properties of the RGO-Ni/Cu composites |
| YAN Zhen，JIANG Fengyang，FU Chong，WANG Jinlong，LIU Xin，ZHANG Siyao |
| （School of Materials Science & Engineering, Xi’an Polytechnic University, Xi’an 710048，China） |
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Abstract The RGO-Ni/Cu composites was prepared by electrostatic self-assembly, ball milling, and powder metallurgy
to solve the problem of graphene structure damage in the ball milling. The effects of milling time on the
morphology of the RGO-Ni/Cu powders and the microstructures、electrical conductivity、vickers hardness and antifriction
performance of the RGO-Ni/Cu composite were studied. The results show that the morphology of the RGONi/
Cu powders changes from agglomerated to lamellar and then to fragmented with increasing the milling time,
while the RGO-Ni powders of the two-dimensional wrinkles shape still retaining. The decentralized form of the
RGO-Ni phase in the RGO-Ni/Cu composites is transformed from agglomerate distribution to stripe distribution
with the increasing of milling time. The RGO-Ni/Cu composite has the best comprehensive properties at the milling
time of 4 h and the coefficient of friction (COF) is 0.456. The wear mechanism of RGO-Ni/Cu composites is
related to the formation degree of the graphene lubrication film. The formation of graphene lubricating film is
affected by the relative density of the RGO-Ni/Cu composites.
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Received: 04 January 2022
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Corresponding Authors:
付翀（1980—），男，博士，教授，主要研究方向为金属基复合材料。
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2023, Vol. 33 
