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1 Composites Theory and Practice

1 2025

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Manufacturing and technological properties of Cu-Al2O3 composite powders manufactured by mechanical alloying process

Kurzawa Adam, Kaczmar Jacek W.

Composites Theory and Practice

2025

R. 25, nr 1

49--57

The mechanical alloying process was applied to manufacture Cu based composite powders containing 2.0, 3.5, 5.0 and 10.0 vol.% alumina powders, The electrolytic copper powder and alumina powders were milled in an attritor for 2, 4, 6, 10, 16 and 24 hours. The distribution of the strengthening alumina powders in the copper matrix was investigated by means of light microscopy and evaluated on the basis of earlier elaborated statistical methods. The optimum time ensuring homogeneous distribution of the alumina particles was 24 hours with the attritor axis rotation rate of 120 1/s. The sieve analysis of the manufactured powders, pressability with the application of pressing pressures of 50, 100, 150, 200 and 250 MPa and sinterability at 900o C for 2 hours were investigated. The manufactured powders will be further applied for heat sinks, and contact materials which are characterized by a low wear rate.