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Spark Plasma Sintering of Fine-Grain Ceramic–Metal Composites Based on Garnet-Structure Oxide Y2.5Nd0.5Al5O12 with Mo, W, and Ni

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Abstract

Using wet chemistry techniques, we have obtained ultrafine powders of complex oxides Y2.5Nd0.5Al5O12 with garnet structure and coated with layers of metals (Mo, W, Ni) by means of precipitation from salt solutions. Spark plasma sintering (SPS) was used to obtain fine-grain ceramic composites Y2.5Nd0.5Al5O12 – Met (Met = Mo, W, Ni) with 92–99% density. We have determined sintering activation energies and demonstrated that the dependence of shrinkage of powders on the heating temperature has a two-stage character: the stage of compaction of nanoparticles due to their regrouping and plastic flow under the action of applied stress and the direct sintering stage.

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Acknowledgments

This work is supported by Russian Science Foundation (grant №16-13-10464).

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Golovkina, L.S., Orlova, A.I., Nokhrin, А.V., Boldin, M.S., Lantsev, E.A., Chuvil’deev, V.N. (2019). Spark Plasma Sintering of Fine-Grain Ceramic–Metal Composites Based on Garnet-Structure Oxide Y2.5Nd0.5Al5O12 with Mo, W, and Ni. In: Cavaliere, P. (eds) Spark Plasma Sintering of Materials. Springer, Cham. https://doi.org/10.1007/978-3-030-05327-7_15

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