内氧化工艺对弥散强化铜中Al_2O_3质点特性和粉末显微硬度的影响  

The effects of internal oxidation treatment on properties of Al_2O_3 particles in dispersion-strengthened oxygen-free copper powder and the microhardness of the powder

作　　者：曹先杰[1] 李娜娜[2] 

机构地区：[1]洛阳铜加工集团国家铜材技术中心,洛阳471039 [2]中南大学材料科学与工程系,长沙410083

出　　处：《粉末冶金材料科学与工程》2002年第2期144-148,共5页Materials Science and Engineering of Powder Metallurgy

基　　金：国家"九五"科技攻关项目(97JO2)

摘　　要：通过对弥散强化铜粉显微硬度的测定以及粉体显微组织结构的观察和分析,研究了不同内氧化工艺条件下弥散强化铜粉末显微硬度和强化质点特性的变化。研究结果表明,粉体内晶粒度没有明显变化;晶粒内的弥散质点为γ′-Al_2O_3,这种粒子结构稳定,但Al_2O_3质点粒度随内氧化温度的升高和时间的延长而增大;内氧化工艺影响粉末显微硬度,实验中900℃,3 h内氧化硬度最高。The effects of internal oxidation treatment on properties of the reinforcing particles and the microhardness of dispersion-strengthened oxygen-free copper powder were studied. The results show that the size of the grain in the powder do not change visibly, the dispersed particles, having a invariable structure, are γ'-Al_2O_3, the size of which increase with the increase of the temperature and time, the internal oxidation treatment affect the microhardness, which reach tiptop under 900℃, 3 h treatment in this experiment.

关 键 词：弥散强化铜 组织 显微硬度 

分 类 号：TF122.1[冶金工程—粉末冶金]