球磨时间对石墨烯/铜材料组织和性能的影响

Study on the Effect of Ball-milling Time on Microstructure and Mechanical Properties of Graphene/Cooper Composite Materials

摘要:

采用机械球磨湿磨方法在不同球磨时间下将0.5wt%石墨烯与纳米铜粉混合，然后通过等离子烧结（SPS）方法制备石墨烯/铜（G/Cu）复合材料。利用SEM、XRD等对球磨过程中复合颗粒形貌及其组织结构变化规律进行分析，发现当球磨时间的延长至8h，石墨烯在铜基体中有更好的结合和分布，性能改善相对最佳，G/Cu的拉伸屈服强度为183MPa，较纯铜提高52.5%；压缩屈服强度也由纯铜的150MPa提高到了365MPa，提升近1.4倍；均值硬度也提高到了135HV，导电率IACS达到了66.5%，综合性能得到明显提高。

Abstract:

The nano-cooper powder and graphene are mixed by the way of mechanical wet ball-milling. Then the graphene/cooper (G/Cu) composite materials is prepared by the Spark Plasma Sintering method(SPS). The microstructure and organization structure of graphene and cooper power are analyzed by means of SEM, XRD and other test methods to explore the relationship between the variation of graphene and cooper power and the ball-milling process. It has found that when the ball-milling time increased to 8h, the grapnene nanoplates have a better combination and distribution on cooper substrate. The improvement of performance is relatively best. The tensile yield strength of the G/Cu composite is 183MPa, increased by 52.5%compared with Cu matrix; the compres yield strength is improve more nearly 1.4 times from 150MPa to 365Mpa; the hardness is also increased to 135HV; the conductivity IACS of the composites reaches 65.5%. The comprehensive performance increased significantly.