Abstract
Based on three kinds of CuAl alloy powders with Al mass fraction of 0.18, 0.55 and 1.95%, respectively, as raw materials and Cu2O powder as oxidant, three dispersion-strengthened copper alloy powders with Al2O3 content of 0.34, 1.00 and 3.19%, respectively, were prepared by internal oxidation using the optimal internal oxidation parameter. Hot pressing was subsequently adopted to prepare Al2O3 dispersion-strengthened copper (Cu–Al2O3) alloys. The effects of Al2O3 content on microstructures and properties of alloy powders and sintered alloys were studied. The results showed that the microhardness of three alloy powders after internal oxidation was significantly improved and increased with increasing Al2O3 content. But the difference between powders with 1.00 and 3.19% Al2O3 content was small. The relative densities of sintered alloys with lower Al2O3 content, i.e. 0.34 and 1.00%, were both above 99%. However that with higher Al2O3 content, i.e. 3.19%, was only 97.8%. With increasing Al2O3 content, electrical conductivity decreased and hardness increased obviously. The electrical conductivity and hardness (HRB) of three alloys were 86.0, 71.5, 60.0% IACS, and 68.8, 84.3, 91.0, respectively.
Published Version
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