摘要
采用粉末冶金方法制备不同体积分数的CNTs/Cu和Gra./Cu复合材料,分析两者的相对密度和硬度,考察其拉伸性能,并探讨各自的断裂机制.结果表明,相同增强体体积分数条件下,CNTs/Cu的相对密度和硬度均大于Gra./Cu,且在增强体体积分数为12%时达到最大值;CNTs/Cu的最大拉伸强度为81MPa,Gra./Cu的最大拉伸强度77.5 MPa;CNTs/Cu的断裂形貌为沿晶断裂和穿晶断裂的混合断裂形貌,Gra./Cu的断裂形貌为沿晶断裂.说明纳米级的高强碳管能更加充分地填充在铜颗粒的间隙内,且具有大长径比,易弯曲缠绕,形成网状结构,可限制微裂纹的扩展,提高了铜基体的抗塑变能力.
The CNTs/Cu composites and Gra./Cu composites were fabricated by the powder metallurgy technique. In order to study the reinforcing properties of CNTs in copper matrix, the hardness, relative density, tensile strength and fracture mechanism of CNTs/Cu were studied compared with Gra./Cu. The results show that the hardness and relative density of CNTs/Cu achieve peak with 12% CNTs content, and are always bigger than those of Gra./Cu with the same reinforcement content; the maximum tensile strength is 81 MPa for CNTs/Cu and 77. 5 MPa for Gra./Cu; CNTs/Cu display the mix fracture features of inter-grain and trans-grain, while Gra./Cu displays intergranular fracture. CNTs with high strength, distributed in meshwork and acting as framework, could restrict the extending of crack and improve the strength and ductibility of the composites.
出处
《西安工程大学学报》
CAS
2017年第4期533-536,共4页
Journal of Xi’an Polytechnic University
基金
西安工程大学博士科研启动基金资助项目(BS1303)
