微波烧结温度对CNTs/Cu复合材料结构和性能的影响

Effect of microwave sintering temperature on microstructures and properties of CNTs/Cu composites

结合液相混合方法、微波烧结技术和冷轧技术制备碳纳米管增强铜基(carbonnanotubesreinforcedcopper-matrix,CNTs/Cu)复合材料,研究不同烧结温度对于CNTs/Cu复合材料微观形貌、力学性能及物理性能的影响。结果表明,采用液相混合法制备出粒径为200～500 nm、碳纳米管质量分数为0.5%的CNTs/Cu复合粉体,碳纳米管均匀分散在铜颗粒中,并与之形成良好结合界面。CNTs/Cu复合材料的相对密度、硬度、电导率随着烧结温度的升高先增大后减小,在烧结温度为1000℃时达到最佳。制备的碳纳米管质量分数为0.5%的CNTs/Cu复合材料组织均匀、孔隙数量及尺寸较少,相对密度为95.79%,硬度为HV 80.9,电导率为81.8%IACS。经冷轧处理后,CNTs/Cu复合材料拉伸强度达到218 MPa,延伸率保持37.75%。由此可见,微波烧结技术是一种制备高性能CNTs/Cu复合材料的理想方法。

Carbon nanotubes reinforced copper-matrix(CNTs/Cu) composites were prepared by the combination of liquid phase method, microwave sintering, and rolling technology. The effects of sintering temperature on micromorphology, mechanical properties, and physical properties of CNTs/Cu composites were investigated. The results show that, 0.5% CNTs/Cu composite powders(mass fraction) are prepared by liquid phase method with the diameter of 200～500 nm, the carbon nanotubes are uniformly dispersed in copper particles, forming a good bonding interface with cooper. The relative density, hardness, and electrical conductivity of CNTs/Cu composites first increase and then decrease with the increase of sintering temperature. The optimum properties of 0.5% CNTs/Cu composites are obtained when the sintering temperature is 1000 ℃, which show the less pores and uniform distribution, the relative density reaches 95.79%, the hardness is HV 80.9, and the electrical conductivity is 81.8% IACS. Subsequent rolling process enables the better performance of sintered composites which shows the tensile strength of 218 MPa and the elongation of 37.75%. Thus, it can be seen that the microwave sintering technology is an ideal method for the preparation of high-performance CNTs/Cu composites.