BORON OXIDE AS A SINTERING ADDITIVE FOR SILICON-ALUMINIUM OXYNITRIDES

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Abstract

Interaction of β-sialons Si5AlON7 and Si4Al2O2N6 with a boron oxide was studied. Boron oxide was introduced in the form of boric acid, the acid content was set up at 0.5wt.% and 5.0wt.%. Samples were sintered at 1650°C in the stream of N2 for 2h. It was found that all the samples showed higher densities against those for samples sintered with no aids, however, the densities were still lower as compared to theoretical levels. In most cases disproportionation of the basic phase into phases enriched with aluminum (Si3Al6O12N2) and silicon (Si2N2O) occurred. Moreover, when Si4Al2O2N6 was sintered with an addition of 0.5wt.% of boric acid, a noticeable amount of SiO2 was also formed. Sintering of Si5AlON7 with an addition of boric acid did not lead to sufficient changes in microhardness and bending strength. In contrast, sintering of Si4Al2O2N6 sintered with an addition of 0.5wt.% of boric acid resulted in an increase in bending strength by ~14%, however, an addition of 5.0wt.% of boric acid caused a decrease in hardness by ~9% and a drop in bending strength by ~36%.

About the authors

N. S Akhmadullina

A.A. Baikov Institute of Metallurgy and Materials Science of Russian Academy of Sciences

Email: nakhmadullina@mail.ru
Moscow, Russia

V. P Sirotinkin

A.A. Baikov Institute of Metallurgy and Materials Science of Russian Academy of Sciences

Moscow, Russia

A. S Lysenkov

A.A. Baikov Institute of Metallurgy and Materials Science of Russian Academy of Sciences

Moscow, Russia

K. A Kim

A.A. Baikov Institute of Metallurgy and Materials Science of Russian Academy of Sciences

Moscow, Russia

S. V Fedorov

A.A. Baikov Institute of Metallurgy and Materials Science of Russian Academy of Sciences

Moscow, Russia

Yu. F Kargin

A.A. Baikov Institute of Metallurgy and Materials Science of Russian Academy of Sciences

Moscow, Russia

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