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Tubular alumina as a key component of new thermally stable ceramic materials

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Abstract

Using scanning electron microscopy and X-ray diffraction, we have examined processes that occur in tubular alumina during heating in air to temperatures in the range 1100–1200°C. The results demonstrate that, starting at temperatures between 600 and 700°C, α-Al2O3 (corundum) is formed in the solid material. Heating the tubular material to 1000°C converts some of the starting alumina into χ-Al2O3 and some into α-Al2O3. The samples calcined for 2–10 h at 1100°C contain α-Al2O3 and æ-Al2O3. Heating to 1000–1300°C has no effect on the shape of the tubular particles. The ceramics obtained in this way are stable in contact with water. When tubular alumina with a SiCl4 vapor hydrolysis product deposited on its surface is heat-treated at temperatures in the range 1100–1300°C, we observe the formation of mullite (Al2O3 · 2SiO2) on the surface of the tubular particles.

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Authors and Affiliations

  1. Moscow State University, Moscow, 119992, Russia

    S. S. Berdonosov, N. B. Prosvetkin, Yu. V. Alekseeva & I. V. Melikhov

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  1. S. S. Berdonosov
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  2. N. B. Prosvetkin
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  3. Yu. V. Alekseeva
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  4. I. V. Melikhov
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Correspondence to S. S. Berdonosov.

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Original Russian Text © S.S. Berdonosov, N.B. Prosvetkin, Yu.V. Alekseeva, I.V. Melikhov, 2014, published in Neorganicheskie Materialy, 2014, Vol. 50, No. 10, pp. 1080–1085.

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Berdonosov, S.S., Prosvetkin, N.B., Alekseeva, Y.V. et al. Tubular alumina as a key component of new thermally stable ceramic materials. Inorg Mater 50, 997–1002 (2014). https://doi.org/10.1134/S0020168514100057

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  • DOI: https://doi.org/10.1134/S0020168514100057

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