Phase Composition and Physicomechanical Properties of β-Sialons Prepared Using NaF as a Sintering Aid

— We have studied the effect of sodium fluoride as a sintering aid for β-sialons on the phase composition and physicomechanical properties of Si 5 AlON 7 and Si 4 Al 2 O 2 N 6 . Two-step high-temperature firing of the β-sialons in the presence of NaF under a nitrogen atmosphere has been shown to cau...

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Bibliographic Details
Published in:Inorganic materials 2023-09, Vol.59 (9), p.970-976
Main Authors: Akhmadullina, N. S., Sirotinkin, V. P., Kim, K. A., Lysenkov, A. S., Frolova, M. G., Fedorov, S. V., Ovsyannikov, N. A., Ivicheva, S. N., Kargin, Yu. F.
Format: Article
Language:English
Subjects:
Bend strength
Chemistry
Chemistry and Materials Science
High temperature
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Microhardness
Phase composition
Sialon
Sintering
Sintering aids
Sodium fluoride
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Summary:— We have studied the effect of sodium fluoride as a sintering aid for β-sialons on the phase composition and physicomechanical properties of Si 5 AlON 7 and Si 4 Al 2 O 2 N 6 . Two-step high-temperature firing of the β-sialons in the presence of NaF under a nitrogen atmosphere has been shown to cause no significant changes in the phase composition of the materials. The density and microhardness of the materials prepared using 0.5 and 5.0 wt % NaF are lower than those of the materials prepared without sintering aids, but the bending strength is higher by up to 14.3% in the case of Si 5 AlON 7 prepared using 0.5 wt % NaF and by 4.9% in the case of Si 4 Al 2 O 2 N 6 prepared using 5.0 wt % NaF.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168523090017