Abstract
Abstract The Al 2 O 3 /Cu composite was prepared by mechanical activation and internal oxidation process. Kinetic factors, which influenced the internal oxidation process, were also discussed in the present paper. The results showed that the duration of the internal oxidation was highly shortened after the powders were treated by mechanical activation. The typical internal oxidation duration was only 1 h. It is unnecessary for further prolonging internal oxidation time. Besides, in order to get a complete internal oxidation heating rate and green density of the compact are another two control factors. Their parameters should be controlled from Al contents in the powders. In this research, the optimum internal oxidation duration, heating rate and green density are 1 h, 20 °C/min and 80%, respectively, for Cu–0.8 wt% Al/Cu 2 O powders. After the internal oxidation, uniform spherical α-Al 2 O 3 particles with an average size 0.5–0.8 μm in diameter were observed in the Cu matrix.
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