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J. Korean Ceram. Soc. > Volume 57(6); 2020 > Article
Journal of the Korean Ceramic Society 2020;57(6): 661-676.
doi: https://doi.org/10.1007%2Fs43207-020-00076-3
Alumina ceramics doped with manganese titanate via applying Mn–Ti–O coatings to corundum micropowder
Andrey M. Abyzov1, Nikolai A. Khristyuk1, Vladimir V. Kozlov1, Fedor M. Shakhov2
1Saint-Petersburg State Institute of Technology , Moskovskii pr. 26 , 190013 Saint-Petersburg , Russia
2Ioff e Institute , Politekhnicheskaya st. 26 , 194021 Saint-Petersburg , Russia
Correspondence  Andrey M. Abyzov ,Email: andabyz@mail.ru
Received: June 2, 2020; Revised: July 14, 2020   Accepted: August 10, 2020.  Published online: November 30, 2020.
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 MnTi–O–C–H xerogel and its annealing. The alumina modifi ed 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. Modifi cation with MnTiO3 precursors yielded higher mechanical properties of ceramics than modifi cation 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.
Key words: Alumina ceramics · Sintering additives · Manganese titanate · Nanocoating · Mechanical properties
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