铝/镍层状复合金属的工艺制备技术研究

Research of Manufacturing Technique of Al/Ni Clad Composite Metal

广泛应用于电池极耳的铝/镍层状复合金属材料,性能要求在保证复合强度的同时,必须控制镍层显微硬度在较低值范围。采用可控气氛热复合工艺,很好地解决了复合强度与镍层硬度控制的矛盾。讨论了可控气氛热复合的机理、退火过程中复合界面的组织变化对复合强度的影响。结果表明:可控气氛热复合机理可用表面热激活机制来进行解释;由于可控气氛热复合技术临界轧制复合变形率较低,采用该技术可最终制备出满足性能要求的铝/镍复合金属带材;严格控制退火工艺特别是温度,可优化工艺、避免金属间化合物的有害作用。

Al/Ni clad composite metal is widely applied as the external terminal of battery under the demands of both high bonding strength and low hardness of nickel layer. A better solution to the contradiction of bonding strength and controlling hardness of nickel was successfully got by adopting a controlled-atmosphere hot-bonding technology for the clad composite metal strip. The mechanism of controlled-atmosphere hot-bonding and the effects of microstructure transformation near the bonding interface on the bonding strength during annealing process were discussed in this research. The results show that： （1） the thermal activation of two metals interface can be explained by the mechanism of bonding; （2） the satisfying properties of final product can be attributed to the lower critical rolling reduction for bonding by the new technique; （3） the temperature is more important for annealing parameters to optimize the technique and to avoid the damage of intermetallic compound.