Simultaneous synthesis and consolidation of nanocrystalline 3Co–Al2O3 composite by pulsed-current-activated heating, and the mechanical properties of the material
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Nanopowders of CoO and Al were fabricated by high-energy ball milling. Highly dense nanostructured 3Co–AlO3 composite was then synthesized and consolidated, within 2 min, from mechanically activated powder (3CoO and Al) under 80 MPa pressure, by a pulsed-current-activated sintering method. The advantage of this process is that it enables very rapid densification to near theoretical density and prevents grain growth in nanostructured materials. The grain sizes of Co and Al2O3 in the composite were calculated. The average hardness and fracture toughness of nanostructured 3Co–AlO3 composite were also investigated.
KeywordsRapid sintering Composite Nanomaterial Mechanical properties Co–AlO3
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (no. 2012001300) and by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Knowledge Economy (no. 20114030200060).
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