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Contribution of the hybrid component to the structure and properties of ceramics based on metastable phases Al2O3
https://doi.org/10.22349/1994-6716-2021-106-2-127-136
Abstract
The paper presents results of the study of the effect of doping with yttrium oxide on ceramics of the composition (γ + θ) Al2O3 + nY2O3 (n = 0, 1, 2, 3 wt%), sintered at 1550°C for 2 h, from powders of the specified composition annealed at temperatures of 500 , 800, 1000°С. X-ray diffraction analysis established the formation in ceramics of yttrium aluminum garnet Y3Al5O12 (YAG) and a metastable phase of the same composition with a tetragonal lattice type in powders at temperatures above 1200°C. The effect of YAG on the physical and mechanical properties was established: high properties were demonstrated by ceramics of the composition α-Al2O3 + 2wt% Y2O3, obtained from a powder annealed at 1000°C. In addition, high physical and mechanical properties were observed in ceramics of the composition α-Al2O3 + 0wt% Y2O3, obtained from a powder annealed at 800°C. The effect of the so-called “mutual protection against crystallization” was discovered, which consists in the mutual inhibition of crystallization processes in powders of the Al2O3 – Y2O3 system.
About the Authors
A. V. Maletsky
A.A. Galkin Donetsk Institute for Physics and Engineering
Ukraine
Ukraine
72 Rozy Lyuksemburg St, 83114 Donetsk
T. E. Konstantinova
A.A. Galkin Donetsk Institute for Physics and Engineering
Ukraine
Ukraine
Dr Sc. (Phys-Math)
72 Rozy Lyuksemburg St, 83114 Donetsk
D. R. Belichko
A.A. Galkin Donetsk Institute for Physics and Engineering
Ukraine
Ukraine
72 Rozy Lyuksemburg St, 83114 Donetsk
G. K. Volkova
A.A. Galkin Donetsk Institute for Physics and Engineering
Ukraine
Ukraine
72 Rozy Lyuksemburg St, 83114 Donetsk
V. V. Burkhovetsky
A.A. Galkin Donetsk Institute for Physics and Engineering
Ukraine
Ukraine
72 Rozy Lyuksemburg St, 83114 Donetsk
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Review
For citations:
Maletsky A.V., Konstantinova T.E., Belichko D.R., Volkova G.K., Burkhovetsky V.V. Contribution of the hybrid component to the structure and properties of ceramics based on metastable phases Al2O3. Voprosy Materialovedeniya. 2021;(2(106)):127-136. (In Russ.) https://doi.org/10.22349/1994-6716-2021-106-2-127-136
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