from the conferences organized by TANGER Ltd.
The conditions for mouldings experimental samples based on aluminum powders of various granulometric composition are presented. The optimal compositions of the charge for pressing, the technology were worked out and the specific pressing pressure was found out, which is 168 MPa. Specific density (2.27 - 2.29 g/cm3), Brinell hardness (2.10 - 2.13 MPa) and electrical resistivity (314 - 501 μΩ·m) were determined experimentally. The effect on the properties of the obtained samples of oxidation processes in the gas phase with different contents of oxygen ions at elevated temperatures up to 520 K and specific pressure up to 12 MPa was investigated. The concentration of oxygen ions varied from 53 to 70 wt%. The distribution of volume oxidation and its effect on the distribution of properties over the volume of samples were established. The hardness of samples in the near-surface layers increased by 36%, in the centre of the sample by 32%. This distribution of hardness indicates an almost uniform oxidation state of the samples throughout the volume. The increase in the average values of the density of samples by 4%, hardness by 35-40% and electrical resistance by 15-21% was determined.
Keywords: Aluminum powders, powder pressing, electrical resistivity, oxygen ions, volume increase© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.