caa a22 4500 463221354 CHVBK 20180405153213.0 cr unu---uuuuu 170326e20070101xx s 000 0 eng 10.1007/s10853-006-1031-6 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1031-6 Sintering temperature depression in Al2O3 by mechanical milling [Elektronische Daten] [H. Goodshaw, J. Forrester, G. Suaning, E. Kisi] High-energy milling of Al2O3 with hardened steel milling media has confirmed that nanocrystalline powders are readily formed. At a ball to charge mass-ratio of 20:1, the crystallite size falls below 30nm in just 2h and below 15nm in 4h. The as-milled powders are contaminated with Fe which increases linearly with increased milling time, reaching ∼10wt% after 16h. The HCl leaching process of Karagedov and Lyakhov [Karagedov and Lyakhov (1999) Nanostruct Mater 11(5):559] was found to remove a large proportion of the Fe, but residual Fe was found with XRF analysis. Milled and leached samples show significant sintering temperature depression to approximately 1100°C and produce sintered densities greater than 94% without the application of pressure. Milling induced lattice expansion of the Al2O3 is observed which we posit to be due to defect formation rather than Fe absorption. The respective roles of small crystallite size and lattice defects in reducing the sintering temperature are discussed. Springer Science+Business Media, LLC, 2006 Goodshaw H. School of Engineering, University of Newcastle, 2308, Callaghan, NSW, Australia aut Forrester J. School of Engineering, University of Newcastle, 2308, Callaghan, NSW, Australia aut Suaning G. School of Engineering, University of Newcastle, 2308, Callaghan, NSW, Australia aut Kisi E. School of Engineering, University of Newcastle, 2308, Callaghan, NSW, Australia aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/1(2007-01-01), 337-345 0022-2461 42:1<337 2007 42 10853 https://doi.org/10.1007/s10853-006-1031-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1031-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Goodshaw H. School of Engineering, University of Newcastle, 2308, Callaghan, NSW, Australia aut NATIONALLICENCE 700 1- Forrester J. School of Engineering, University of Newcastle, 2308, Callaghan, NSW, Australia aut NATIONALLICENCE 700 1- Suaning G. School of Engineering, University of Newcastle, 2308, Callaghan, NSW, Australia aut NATIONALLICENCE 700 1- Kisi E. School of Engineering, University of Newcastle, 2308, Callaghan, NSW, Australia aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/1(2007-01-01), 337-345 0022-2461 42:1<337 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer