铝热反应法制备Mo增强铜基纳米复合材料的组织与性能  

Microstructure and property of Mo reinforced copper matrix nanocomposites prepared by thermite reaction

作　　者：郭铁明[1] 付迎[1] 贾建刚[1] 唐中杰[1] 金硕[1] 吉瑞芳 

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《材料热处理学报》2015年第8期6-11,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51461029);甘肃省有色金属新材料重点实验室开放基金(SKL1307);兰州理工大学红柳青年基金项目(Q201203)

摘　　要：采用铝热反应-自蔓延烧结法制备了钼质量分数分别为5%、10%、20%的Mo增强铜基复合材料。采用X射线衍射仪、光学显微镜、扫描电镜和透射电镜分析了复合材料的物相及微观组织形貌,并研究了钼添加量对复合材料力学性能、导电性能、热膨胀系数的影响。结果表明:该工艺制得的复合材料基体晶粒尺寸均达到纳米级,致密度均达到90%以上,硬度较纯铜提高40%以上,导电性能良好(72%IACS以上)。随着钼质量分数的增加,复合材料的硬度增加,致密度、电导率及热膨胀系数下降。当钼质量分数为20%时,复合材料的致密度为91.88%,电导率为72%IACS,硬度是纯铜的2倍,热膨胀系数较纯铜降低了13%,综合性能最佳。复合材料硬化的主要机理为强化相钼和铜基体弹性模量差别引起的模量硬化。Mo reinforced Cu matrix composite materials with content 5%, 10% or 20% Mo were prepared by thermite reaction-self- propagating sintering method. The phases and microstructure of the composite materials were characterized by means of X-ray diffraction, microscope （OM） , scanning electron microscopy （SEM） and transmission electron microscope （TEM）. The influence of molybdenum content on mechanical properties, conductive performance and thermal expansion coefficient in composite materials were investigated. The results show that matrix grain-size of the composite materials can be in nanometer level. The density can reach above 90% and the hardness value is over 40% than the hardness value of pure copper. Electrical conductivity is more than 72 % IACS. The hardness of the composite increases and the density, the conductivity and the thermal expansion coefficient decrease with the increase of molybdenum mass fraction. When the mass fraction of Mo is 20% , the comprehensive properties of the composite achieve optimum. The density of composite material is 91.88% and the conductivity is 72 % IACS. The hardness of the material is twice as pure copper. The thermal expansion is 13% lower than that of the pure copper. The hardening of the composite is aroused by the difference of elasticity modulus between strengthening phase-Mo and copper matrix.

关 键 词：铝热反应-自蔓延烧结 MO 铜基纳米复合材料 力学性能 物理性能 

分 类 号：TB331[一般工业技术—材料科学与工程]