caa a22 4500 463232720 CHVBK 20180405153247.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s10853-006-0830-0 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0830-0 Fabrication of carbon nanofiber(CNF)-dispersed Al2O3 composites by pulsed electric-current pressure sintering and their mechanical and electrical properties [Elektronische Daten] [Ken Hirota, Yuichi Takaura, Masaki Kato, Yoshinari Miyamoto] Dense Al2O3-based composites (≥99.0% of theoretical) dispersed with carbon nanofibers (CNFs) were fabricated using the pulsed electric-current pressure sintering (PECPS) for 5min at 1300°C and 30MPa in a vacuum. The dispersion of CNFs into the matrix depended much on the particle size of the starting Al2O3 powders. Mechanical properties of the composites were evaluated in relation with their microstructures; high values of three-point bending strength σb (∼800MPa) and fracture toughness K IC (∼5MPa·m1/2) were attained at the composition of CNF/Al2O3=5:95 vol%, which σb and K IC values were ∼25% and ∼5%, respectively, higher than those of monolithic Al2O3. This might be due to the small Al2O3 grains (1.6μm) of dense sintered compacts compared with that (4.4μm) for the pure Al2O3 ceramics, resulting from the suppression of grain growth during sintering induced by uniformly dispersed CNFs in the matrix. Electrical resistivity of CNF/Al2O3 composites decreased rapidly from >1015 to ∼2.1×10−2 Ωm (5vol%CNF addition), suggesting the machinability of Al2O3-based composites by electrical discharge machining. Springer Science+Business Media, LLC, 2007 Hirota Ken Department of Molecular Science and Technology, Faculty of Engineering, Doshisha University, Kyo-Tanabe, 610-0321, Kyoto, Japan aut Takaura Yuichi Department of Molecular Science and Technology, Faculty of Engineering, Doshisha University, Kyo-Tanabe, 610-0321, Kyoto, Japan aut Kato Masaki Department of Molecular Science and Technology, Faculty of Engineering, Doshisha University, Kyo-Tanabe, 610-0321, Kyoto, Japan aut Miyamoto Yoshinari Joining and Welding Research Institute, Osaka University, Ibaraki, 567-0047, Osaka, Japan aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/13(2007-07-01), 4792-4800 0022-2461 42:13<4792 2007 42 10853 https://doi.org/10.1007/s10853-006-0830-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0830-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hirota Ken Department of Molecular Science and Technology, Faculty of Engineering, Doshisha University, Kyo-Tanabe, 610-0321, Kyoto, Japan aut NATIONALLICENCE 700 1- Takaura Yuichi Department of Molecular Science and Technology, Faculty of Engineering, Doshisha University, Kyo-Tanabe, 610-0321, Kyoto, Japan aut NATIONALLICENCE 700 1- Kato Masaki Department of Molecular Science and Technology, Faculty of Engineering, Doshisha University, Kyo-Tanabe, 610-0321, Kyoto, Japan aut NATIONALLICENCE 700 1- Miyamoto Yoshinari Joining and Welding Research Institute, Osaka University, Ibaraki, 567-0047, Osaka, Japan aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/13(2007-07-01), 4792-4800 0022-2461 42:13<4792 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer