Sintering temperature depression in Al2O3 by mechanical milling

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 30 nm in just 2 h and below 15 nm in 4 h. The as-milled powders are contaminated with Fe which increa...

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Published in:Journal of materials science 2007-01, Vol.42 (1), p.337-345
Main Authors: GOODSHAW, H. J, FORRESTER, J. S, SUANING, G. J, KISI, E. H
Format: Article
Language:English
Subjects:
Aluminum oxide
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Crystal defects
Crystallites
Exact sciences and technology
Leaching
Materials science
Mechanical alloying
Mechanical milling
Miscellaneous
Sintering
Sintering (powder metallurgy)
Technical ceramics
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cited_by cdi_FETCH-LOGICAL-c334t-f83e3c5a9d43d96dbb07d4236da5b3b0b1869f21909c30cbb62bf97dda5c431f3
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container_title Journal of materials science
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creator GOODSHAW, H. J
FORRESTER, J. S
SUANING, G. J
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description 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 30 nm in just 2 h and below 15 nm in 4 h. The as-milled powders are contaminated with Fe which increases linearly with increased milling time, reaching ∼10 wt% after 16 h. 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.
doi_str_mv 10.1007/s10853-006-1031-6
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subjects Aluminum oxide
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Crystal defects
Crystallites
Exact sciences and technology
Leaching
Materials science
Mechanical alloying
Mechanical milling
Miscellaneous
Sintering
Sintering (powder metallurgy)
Technical ceramics
title Sintering temperature depression in Al2O3 by mechanical milling
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