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

Author

Akhmadullina, N. S., Sirotinkin, V. P., Kim, K. A., Lysenkov, A. S., Frolova, M. G., Fedorov, S. V., Ovsyannikov, N. A., Ivicheva, S. N., and Kargin, Yu. F.

Subjects
MICROHARDNESS, SINTERING, PHASE change materials, SODIUM fluoride
Abstract

We have studied the effect of sodium fluoride as a sintering aid for β-sialons on the phase composition and physicomechanical properties of Si5AlON7 and Si4Al2O2N6. 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 Si5AlON7 prepared using 0.5 wt % NaF and by 4.9% in the case of Si4Al2O2N6 prepared using 5.0 wt % NaF. [ABSTRACT FROM AUTHOR]

Published
2023
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8. Si3N4/TiN Ceramic Composites Produced by Hot Pressing.

Author

Kim, K. A., Lysenkov, A. S., Frolova, M. G., and Kargin, Yu. F.

Subjects
SILICON nitride, TITANIUM composites, CERAMICS, HOT pressing, NITRIDATION, POWDERS, TITANIUM, MICROHARDNESS
Abstract

Si3N4/TiN ceramic composites have been prepared by hot pressing in a nitrogen atmosphere using fine Si3N4 and Ti powders and CaO–Al2O3 sintering aids and investigated. The results demonstrate that hot pressing was accompanied by titanium nitridation, yielding titanium nitride with the composition TiN0.9. Reaction between silicon nitride and the sintering aid led to the formation of a Ca-α-SiAlON with the composition Ca0.67(Si10Al2)(N15.3O0.7). In addition to the major phases, calcium aluminosilicate with the composition Ca3Al2Si3O12 was identified. Increasing the percentage of titanium nitride in the composites prepared at a temperature of 1650°C led to an increase in their density and Vickers microhardness: from 3.18 ± 0.03 to 4.33 ± 0.03 g/cm3 and from 17 ± 1.1 to 29.4 ± 0.9 GPa, respectively. [ABSTRACT FROM AUTHOR]

Published
2023
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11. Effect of CaO–Al2O3 (48 : 52 wt %) Sintering Aids on the Phase Composition and Properties of Si3N4-Based Ceramics.

Author

Kim, K. A., Lysenkov, A. S., Fedorov, S. V., Petrakova, N. V., Frolova, M. G., Perevislov, S. N., and Kargin, Yu. F.

Subjects
CERAMIC powders, SINTERING, SILICON nitride, CERAMICS, HOT pressing, SCANNING electron microscopy
Abstract

Si3N4-based ceramics have been produced by hot pressing in the temperature range 1550–1650°C using α-Si3N4 starting powder and CaO–Al2O3 (48 : 52 wt %) sintering aids. The powders and the ceramics have been characterized by dilatometry, scanning electron microscopy, and X-ray diffraction, and we have measured the microhardness and density of the ceramic samples. The results demonstrate that the sintering aid reacted with Si3N4 to form Ca-α-SiAlON. At 40 wt % sintering aids, all of the silicon nitride was converted into Ca-α-SiAlON. We have clarified general trends in the effect of the amount of sintering aids on the properties of the ceramic samples. [ABSTRACT FROM AUTHOR]

Published
2022
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17. 21R-Sialon ceramics, obtained by hot pressing

Author

Lysenkov, A S, primary, Stolbova, M O, additional, Titov, D D, additional, Plokhikh, A I, additional, Kim, K A, additional, Gridin, D V, additional, Frolova, M G, additional, Petrakova, N V, additional, Danilin, K D, additional, Lemeshev, D O, additional, and Kargin, Yu F, additional

Published
2020
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20. Silicon carbide ceramics reinforced SiC fibers

Author

Frolova, M G, primary, Kargin, Yu F, additional, Lysenkov, A S, additional, Perevislov, S N, additional, Titov, D D, additional, Kim, K A, additional, Leonov, A V, additional, Istomina, E I, additional, Istomin, P V, additional, and Tomkovich, M V, additional

Published
2019
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25. Synthesis the composites Si3N4-TiN by hot pressing

Author

Kargin, Yu F, primary, Lysenkov, A S, additional, Kim, K A, additional, Ivannikov, A Yu, additional, Frolova, M G, additional, Titov, D D, additional, Ivicheva, S N, additional, Ovsyannikov, N A, additional, Konovalov, A A, additional, Perevislov, S N, additional, and Petrakova, N V, additional

Published
2019
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