弥散强化Al_2O_3/Cu复合材料的外氧化制备工艺研究

Study on the External Oxidation Preparing Technology of Dispersion Strengthening Al_2O_3/Cu Composite

采用外氧化法生成氧化剂Cu2O,在真空条件下进行内氧化烧结,制备Al2O3颗粒弥散强化的铜基复合材料,对其工艺和微观组织进行研究。研究表明:更高的热挤压加热温度和延长保温时间,有助于残余的氧化剂Cu2O转变成Cu;经热挤压变形后,0.48ω%Al2O3/Cu复合材料的导电率随变形量的增加可分为升高区和降低区两个区,而洛氏硬度随变形量的增加而增加,当变形量达到40%后,硬度增加趋于平缓。

The Al2O3 particles dispersion strengthened copper matrix composites were prepared by external oxidation in a furnace to generate Cu2O oxidant in advance, then internal oxidation to generate Al2O3 and sintered in a vacuum furnace. The preparing technology and microstrneture of experiment materials were investigated. The results show that higher heating temperature and longer heat holding time for hot extru- sion will be helpful for the residual oxidant Cu2O to be transformed into Cu. The change of conductivity of 0.48ω% Al2O3/Cu composite with the deformation ratio after hot extrusion can be divided into two zones, one is increase zone and another is reduce zone. While the Rockwell hardness increases with the increase of deformation ratio and the deformation ratio reaches 40% , the hardness increases gradually.