Structure, Phase Composition, and Properties of Ceramics Based on AlMgB14, Obtained from Various Powders
Ceramics based on AlMgB14 were obtained by the methods of mechanical activation (MA) and subsequent hot pressing. Structure, phase composition and properties of materials based on AlMgB14 were studied. The time of mechanical activation was 1–5 h. The synthesis temperature was 1400 °C under a pressure of 50 MPa. The effect of the mechanical activation of powder mixtures was examined. Particle size distribution was obtained for each powder mixture. The minimum particle size was observed for the powder after 4 h of MA and was 0.8 μm. The increase in the particle size from 0.8 to 9.8 μm after 5 h of MA is due to the agglomeration of nanoparticles under the action of Van der Waals forces. The hardness of the sample synthesized from the powder mixture after 5 h of mechanical activation was approximately 14 GPa. The density of the sample was 2.3 g/cm3.
KeywordsAlMgB14 Ceramic Ultra-hard materials Hot pressing Mechanical activation Hardness Al–Mg–B system
Studies were funded by Russia Science Foundation (Project No. 17-79-10272).