Contribution of the hybrid component to the structure and properties of ceramics based on metastable phases Al<sub>2</sub>O<sub>3</sub>-Reference-Cited by-同舟云学术

Contribution of the hybrid component to the structure and properties of ceramics based on metastable phases Al₂O₃

Published:2021-08-01 Issue:2(106) Volume: Page:127-136
ISSN:1994-6716
Container-title:Voprosy Materialovedeniya
language:
Short-container-title:Vopr. materialoved.

Author:

Maletsky A. V.¹,Konstantinova T. E.¹,Belichko D. R.¹,Volkova G. K.¹,Burkhovetsky V. V.¹

Affiliation:

1. A.A. Galkin Donetsk Institute for Physics and Engineering

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.

Publisher

FSUE CRISM Prometey

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