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Alumina ceramics doped with manganese titanate via applying Mn–Ti–O coatings to corundum micropowder

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Abstract

The aim of this work was (i) to develop an untraditional method of alumina doping that ensures low sintering temperature and (ii) to obtain dense engineering ceramics with good mechanical properties by conventional sintering. A nanostructured coating of manganese–titanium oxides was applied to α-Al2O3 micropowder particles using liquid-phase synthesis of Mn–Ti–O–C–H xerogel and its annealing. The alumina modified in this way was sintered at 1300–1400 °C in air. The sintering process was accompanied by the formation of manganese metatitanate MnTiO3. The sintered samples have the relative density of about 97%, the bending strength of ≥ 260 MPa, and the Vickers microhardness of ≥ 16 GPa. The longitudinal and transverse sound velocities were measured, from which the Poisson’s ratio of 0.24 and the Young’s modulus of ≥ 360 GPa were calculated. Modification with MnTiO3 precursors yielded higher mechanical properties of ceramics than modification with a ready MnTiO3 coating. The results are compared with the properties of Al2O3 doped with Mn–Ti–O formulations in other studies, and of industrial alumina ceramics.

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Notes

  1. At the Al2O3 content of 95 wt% or higher, alumina ceramics are termed corundum ceramics.

  2. Common designation core@shell.

  3. In fact, the mass of an element is measured per unit surface area, which is converted into thickness using a given density.

  4. The standard deviations are indicated after the ± sign in Table 3.

  5. Calculation by the Anderson–Hasler equation [44] yielded the X-ray range (EDS depth) RX = 2.2 μm. Approximating the X-ray exit zone by a hemisphere (sphere) of diameter RX, we obtain the analyzed volume of 2.8 (5.6) μm3. The volume of an Al2O3 particle with a median size of 1.5 μm (Table 1) is 1.8 μm3. Therefore, roughly 2–3 particles are analyzed: 2.8 (5.6)/1.8 = 1.6 (3.1).

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Acknowledgments

This work (A. M. Abyzov, N. A. Khristyuk, V. V. Kozlov) was supported by the state assignment of the Ministry of Science and Higher Education of the Russian Federation (785.00.X6019).

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Authors and Affiliations

  1. Saint-Petersburg State Institute of Technology, Moskovskii pr. 26, 190013, Saint-Petersburg, Russia

    Andrey M. Abyzov, Nikolai A. Khristyuk & Vladimir V. Kozlov

  2. Ioffe Institute, Politekhnicheskaya st. 26, 194021, Saint-Petersburg, Russia

    Fedor M. Shakhov

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Abyzov, A.M., Khristyuk, N.A., Kozlov, V.V. et al. Alumina ceramics doped with manganese titanate via applying Mn–Ti–O coatings to corundum micropowder. J. Korean Ceram. Soc. 57, 692–707 (2020). https://doi.org/10.1007/s43207-020-00076-3

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