| A12O3/Cu composites layer is prepared through internal oxidation of aluminized copper by investment. Influence of the aluminum in aluminizing agents on the aluminum distribution in the copper surface is discussed, the microstructure and properties of Al2O3/Cu composites layer under different technical parameter are studied. The results show that the microstructure of Al2O3/Cu composites layer obtained by this method is homogeneous and the copper matrix is dispersed with fine Al2O3 particles, the electric conductivity and thermal conductivity of Al2O3/Cu composites are reduced little while the wear resistance and micro-hardness are improved greatly. The investment aluminized after surface nano-crystallization of copper and electuary aluminized copper are also discussed in this paper. The results indicate that the aluminized temperature is decreased, the depth and aluminum content of aluminized layer increased after surface nano-crystallization of copper. |
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