Reaction between ∼0.7- to 1-μm α-Al2O3 particles and SiO2 during high-temperature sintering

Al 2 O 3 :Cr 3+ and Al 2 O 3 :Ti 3+ particles with an average size of ∼1 and 0.7 μm, respectively, have been prepared through mechanical grinding of bulk crystals. Using purpose-designed accessories made from chromium and titanium, we were able to prevent Fe contamination. We studied the reaction be...

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Bibliographic Details
Published in:Inorganic materials 2012-04, Vol.48 (4), p.350-354
Main Authors: Guryanov, A. N., Yashkov, M. V., Abramov, A. N., Shatailo, E. D., Melkumov, M. A., Torsunov, M. F., Kachenyuk, M. N.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
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Summary:Al 2 O 3 :Cr 3+ and Al 2 O 3 :Ti 3+ particles with an average size of ∼1 and 0.7 μm, respectively, have been prepared through mechanical grinding of bulk crystals. Using purpose-designed accessories made from chromium and titanium, we were able to prevent Fe contamination. We studied the reaction between α-Al 2 O 3 and SiO 2 particles during high-temperature sintering. The results demonstrate that, in this system at temperatures above 1300°C, corundum particles dissolve in silica to form mullite. The reaction temperature and rate depend on the particle size composition of the Al 2 O 3 . The heating rate is shown to influence the dissolution rate of corundum particles. Increasing the heating rate from 7 to 15°C/min shifts the dissolution range of alumina particles from 1500 to 1630°C.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168512040048