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

N. S. Akmadullina; Ахмадуллина Н. С.; V. P. Sirotinkin; Сиротинкин В. П.; K. A. Kim; Ким К. А.; A. S. Lysenkov; Лысенков А. С.; M. G. Frolova; Фролова М. Г.; S. V. Fedorov; Федоров С. В.; N. A. Ovsyannikov; Овсянников Н. А.; S. N. Ivicheva; Ивичева С. Н.; Yu. F. Kargin; Каргин Ю. Ф.

doi:10.31857/S0002337X23090014

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

Authors: Akmadullina N.S.¹, Sirotinkin V.P.², Kim K.A.², Lysenkov A.S.², Frolova M.G.², Fedorov S.V.³, Ovsyannikov N.A.², Ivicheva S.N.², Kargin Y.F.⁴
Affiliations:
1. Baikov Institute of Metallurgy, Russian Academy of Sciences
2. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences
3. Baykov Institute of Metallurgy and Materials Science, Russian Academy of Sciences
4. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 119991, Moscow, Russia
Issue: Vol 59, No 9 (2023)
Pages: 1010-1016
Section: Articles
URL: https://journals.rcsi.science/0002-337X/article/view/249391
DOI: https://doi.org/10.31857/S0002337X23090014
EDN: https://elibrary.ru/XOQQKB
ID: 249391

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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.

Keywords

sialon, sodium fluoride, sintering aid, density, microhardness, bending strength

References

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