【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′-Al₂O₃,这种粒子结构稳定,但Al₂O₃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。更多还原

【Abstract】 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’-Al₂O₃, 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.更多还原