| Title |
Synthesis and Rapid Sintering of Nanocrystalline CoTi-ZrO₂ Composite |
| DOI |
https://doi.org/10.3365/KJMM.2016.54.11.826 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
sintering; composite materials; nanomaterials; mechanical properties; synthesis |
| Abstract |
CoTi and ZrO₂ nanopowders were mechanochemically synthesized from CoTiO3 and Zr powders according to the reaction (2CoTiO3 + 3Zr → 2CoTi + 3ZrO₂). The milled powders were then consolidated by pulsed current-activated sintering within two minutes under an applied pressure of 80MPa. The average hardness and fracture toughness of the nanostructured 2CoTi-3ZrO₂ composite sintered from high energy ball milled powder were 940 kg/mm² and 6 MPaㆍm1/2, respectively. The mechanical properties of the composite were higher than those of monolithic CoTi or ZrO₂, respectively. The microstructure and phases of the composite were investigated using FE-SEM and XRD. (Received May 4, 2016; Accepted May 23, 2016) |