Abstract
We have studied the properties of transparent magnesium aluminate spinel ceramics prepared by spark plasma sintering (SPS) of ultrapure nanopowders. The starting powders, of ≃ 99.98% purity, ranging in specific surface area from 30 to 160 m2/g, were prepared through the hydrolysis of alcoholic solutions of magnesium aluminum alkoxide complexes, followed by calcination at temperatures from 900 to 1100°C. SPS was carried out at 1450°C, with the holding time at the highest temperature not longer than 15 min. The transparent ceramic samples thus prepared have a transmission of up to 73% in the visible and IR spectral regions (λ = 2.5–5.0 µm). The crystallite size in the ceramics is 0.2–0.4 µm, and their microhardness is HV0.1 = 14.8–16.2 GPa.
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Original Russian Text © M.K. Alekseev, G.I. Kulikova, M.Yu. Rusin, N.N. Savanina, S.S. Balabanov, A.V. Belyaev, E.M. Gavrishchuk, A.V. Ivanov, R.N. Rizakhanov, 2016, published in Neorganicheskie Materialy, 2016, Vol. 52, No. 3, pp. 367–373.
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Alekseev, M.K., Kulikova, G.I., Rusin, M.Y. et al. Transparent ceramics prepared from ultrapure magnesium aluminate spinel nanopowders by spark plasma sintering. Inorg Mater 52, 324–330 (2016). https://doi.org/10.1134/S002016851603002X
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DOI: https://doi.org/10.1134/S002016851603002X