Sintered Materials Based on Copper and Alumina Powders Synthesized by a Novel Method

摘要

This paper presents the production of sintered materials from nano-composite powders obtained by a novel synthesis method, which represents a combination of thermochemical synthesis and mechanical alloying. Produced powders were characterized by an average individual particle size of 30nm, with the presence of a small number of aggregates with a size of 150nm. The positive effect on dispersion strengthening of the copper matrix occurred up to 1 wt.% Al_2O_3, whereas a further increase of the Al_2O_3 content showed a negative effect on hardness. The new synthesis method is more suiTab. for composite materials containing maximum 1wt.% Al_2O_3. By this novel method it is possible to produce composites possessing a good combination of hardness and electrical conductivity.