工艺因素对铜-铝-铜复合板界面结合的影响

Effect of technological parameters on interface bonding of copper-aluminum-copper composite plate

为了减轻导电材料的结构质量,在铝板两侧放置铜带制备出一种铜铝铜复合结构,采用冷轧工艺进行轧制成形.系统研究了轧制压下率和轧前表面处理对轧制复合效果的影响,对铜铝铜复合板结合界面进行了观察,分析了退火对结合界面的影响.结果表明,随着压下率的增加,复合板的剥切力增加.改变铜带厚度时,复合板的剥切力随铜铝厚度比的减小而增大.当铝板厚度为12 mm、铜铝厚度比为0.06时,轧制复合效果最佳.冷轧复合前处理影响因素中,刷拭处理对复合效果影响最大,铜铝软化退火处理次之,酸碱洗处理影响最小.复合板结合界面在轧制后发生了互扩散.在250℃下进行不同时长退火时,复合板中形成了明显的扩散层.当退火时间为50 h时,复合板中出现了两层扩散层,扩散层厚度随退火时间的增加而增加.

In order to reduce the structural weight of conductive materials,a copper-aluminum-copper composite structure was prepared by placing copper strips on both sides of aluminum plate,and the cold rolling technology was used for rolling formation.The influence of rolling reduction rate and surface treatment before rolling on the rolling composite effect was systematically studied,the bonding interface of copper-aluminum-copper composite plate was observed,and the effect of annealing on interface was analyzed.The results show that the peeling force of composite plate increases with the increase of reduction rate.When the thickness of copper strips changes,the peeling force of composite plate increases with the decrease of thickness ratio of copper to aluminum.When the thickness of aluminum plate is 12 mm and the thickness ratio of copper to aluminum is 0.06,the as-rolled composite effect is optimal.Among the influencing factors of cold rolling composite pretreatment,the brushing treatment has the greatest influence on composite effect,the softening-annealing treatment of copper and aluminum takes the second place,and the acid-base washing treatment has the least influence.The mutual diffusion occurs at the bonding interface of composite plate after rolling.When the composite plate was annealed at 250℃for different time,the obvious diffusion layer forms in composite plate.When the annealing time is 50 h,two diffusion layers appear in the composite plate,and the thickness of diffusion layer increases with the increase of annealing time.