表面内氧化Al_2O_3/Cu-(Ce+Y)弥散铜薄板带的组织和性能

Microstructure and Properties of the Al_2O_3/Cu-(Ce+Y) Dispersion Strengthened Copper by Surface Internal Oxidation

采用内氧化工艺,在950℃以工业N_2中的余氧为内氧化介质对试样进行表面内氧化,成功制备了Al_2O_3/Cu复合材料,并对其组织和性能进行了分析。结果表明:Cu-Al-RE合金经950℃×2 h内氧化后,表面内氧化层厚度随着混合稀土含量的增加而增加,当超过0.1%(Ce+Y)时,表面内氧化层厚度略有降低;内氧化法制备的Al_2O_3/Cu-(Ce+Y)复合材料中弥散分布着大量纳米级的Al_2O_3颗粒;添加适量的混合稀土能改善Cu-Al合金的导电性,提高合金的硬度。

Al2O3/Cu composite was prepared by internal oxidation of Cu-Al-RE alloy sheet with the oxygen from the commercial nitrogen gas at 950℃. The microstructure and properties of the composite were investigated respectively. The results indicate that after Cu-Al-RE alloy internal oxidation at 950℃ ×2h, the surface oxide layer thickness increases with increasing the mixed rare earth content. When the content beyond 0.1%, the surface oxide layer thickness decreases slightly.Al2O3 nano-particles disperse in Al2O3/Cu-（Ce＋Y） composite after surface internal oxidation. The appropriate amount of the mixed rare earth improves electrical conductivity and hardness of Cu-Al alloy.