| Title |
Fabrication of Nanocrystalline Co-Al2O3 from Mechanically Synthesized Powders by Rapid Sintering |
| Authors |
박나라(Na Ra Park); 손인진(In Jin Shon) |
| DOI |
https://doi.org/10.3365/KJMM.2012.50.12.961 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
rapid sintering; composite materials; nanomaterials; mechanical properties |
| Abstract |
Nano-sized Co and Al2O3 powders were successfully synthesized from 3/4Co3O4 and 2Al by highenergy ball milling. A dense nanocrystalline 2.25Co-Al2O3 composite was consolidated from mechanically synthesized powders by the pulsed current activated sintering (PCAS) method within 2 min. Consolidation was accomplished under the combined effects of a pulsed current and mechanical pressure. A dense 2.25 Co-Al2O3 with relative density of up to 95% was produced under simultaneous application of a 80 MPa pressure and a pulsed current of 2800 A. The fracture toughness and hardness of the 2.25Co-Al2O3 composite were 8 MPa · m1/2, 870 kg/mm2, respectively. |