Microwave sintering of IR-transparent Y2O3–MgO composite ceramics

A method for preparation of dense Y2O3–MgO composite ceramics by the microwave sintering was developed. The initial powders were obtained by glycine-nitrate self-propagating high-temperature synthesis (SHS) with different oxidant-to-fuel ratio. Density and IR-transmission of microwave sintered Y2O3–...

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Bibliographic Details
Published in:Ceramics international 2023-03, Vol.49 (5), p.7236-7244
Main Authors: Permin, D.A., Egorov, S.V., Belyaev, A.V., Balabanov, S.S., Koshkin, V.A., Boldin, M.S., Novikova, A.V., Timofeev, O.V., Ladenkov, I.V.
Format: Article
Language:English
Subjects:
Composite ceramics
Magnesia
Microwave sintering
Yttria
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Summary:A method for preparation of dense Y2O3–MgO composite ceramics by the microwave sintering was developed. The initial powders were obtained by glycine-nitrate self-propagating high-temperature synthesis (SHS) with different oxidant-to-fuel ratio. Density and IR-transmission of microwave sintered Y2O3–MgO ceramics increase with respect to dispersity of the SHS-powders and reach its maximum values for the powder prepared in a 20% fuel excess. The sintering behavior of Y2O3–MgO compacts was investigated by optical dilatometry and measuring an electric conductivity upon heating. Significant microwave radiation power surges at temperatures of 900–1000 °C, caused by the decomposition of magnesium carbonate, have been found. As a result of matching the conditions for the synthesis of powders and sintering modes, a transmission of composite ceramics of 78% at a wavelength of 6 μm was achieved at a maximum processing temperature of 1500 °C.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2022.06.062