石墨烯掺杂对Cu-Nb复合线材微观结构及性能影响

Effect of Graphene doping on Microstructures and Properties of Cu-Nb Composite Wires

摘要:

本文采用粉末套管工艺,结合集束拉拔技术成功制备出了石墨烯包覆铌粉末增强Cu-Nb的7芯复合线材(8#)、及纯铌粉末增强Cu-Nb的7芯复合线材(9#)。通过优化热处理工艺后,线材在塑性加工过程中的断芯现象得到了明显的改善,尤其是石墨烯包覆铌粉末增强Cu-Nb的复合线材(8#),其芯丝分布较为规则和均匀,协调变形能力较好。通过对不同尺寸(Φ2.49mm、Φ2.29mm、Φ2.02mm、Φ1.84mm)的两种线材的微观结构、力学性能及电学性能的分析,结果表明,相比同尺寸条件下纯铌粉增强Cu-Nb线材,石墨烯包覆铌粉末增强Cu-Nb线材的力学性能虽然仅提高了几十个MPa,但其导电性明显增强,接近10 IACS%,最后分析了两种不同尺寸线材的塑性变形机制及引起线材性能变化的微观机理。

Abstract:

In this paper, Cu-Nb microcomposite (8 #) with 7 cores reinforced by graphene coated with niobium powder and reinforced by pure niobium powder (9#) with 7 cores were successfully prepared by accumulative drawing and bundling process.The breakage phenomenon of wire in plastic processing has been significantly improved after the optimization of heat treatment process, especially the wire (8 #) reinforced by graphene coated with niobium powder,which have a regular uniform distribution of the core and a good coordination.Through the analysis of the microstructure, mechanical properties and electrical properties of two kinds of wire with different sizes (Φ2.49mm, Φ2.29mm, Φ2.02mm, Φ1.84mm), the results show that the mechanical properties of Cu-Nb wire reinforced by graphene coated with niobium powder increased only tens of MPa that compared with reinforced by pure niobium powder, however,the conductivity of the Cu-Nb wire increased obviously, which reached 10 IACS%.Finally, the plastic deformation mechanism of two kinds of wires were analyzed.