Production and characteristics of AgO-CuO composites powders

Abstract

To avoid the troubles deriving from the conventional recycling process, an alternative process has been created, where chips of Al and its alloys are cut or milled convected directly by hot plastic working into final products. In the paper, the production of composites by the direct convertion of Al and AlMg2-alloy granulated chips with tungsten powder into final products by hot extrusion are described. The following extrusion parameters are the most important for the obtainment of high densities: (i) a high extrusion temperature, which enables the plastic flow of an extremely plastic matrix into pores and voids; and (ii) relatively low extrusion rates, which extend the time of plastic flow of the matrix material into the pores and voids and also the time for diffusional transport. The hardness and mechanical properties of Al and AlMg2 base composites are slightly lower than those of metallurgically-produced materials. The direct convertion method does not have any harmful effects on the environment and the material produced can be further processed by other plastic working methods such as forging and rolling.