Uniformly dispersed nano-Al2O3 particles reinforced copper matrix by chemical coprecipitation method

Abstract

The CuO-Al2O3 composite powders were synthesized by chemical coprecipitation method, then, after sintering in tube furnace of 400 °C for 1 h at atmosphere of hydrogen and nitrogen, the composite powders were pressed into pellets under 400 MPa and sintered at 800 °C for 1 h in the mixing atmosphere of nitrogen and hydrogen to form Cu-Al2O3 balks. The characterization and test results show that the reinforcing phase and matrix are mutually dispersed in the process of coprecipitation, and the composite gains more homogeneous size and higher hardness as the dispersion effect of reinforcement on the copper matrix achieves the best.