Influence of the Y₃Al₅O₁₂ on the structure formation and properties of ceramics of the Al₂O₃ – Y₂O₃ system

The paper presents results of the study of the structure and physico-mechanical properties of ceramics composits α-Al₂O₃ + n Y₂O₃ (n = 0; 0.5; 1; 1.5; 2; 3; 4; 5 wt.%) based on the basis of polymorphic modifications γ+θ-Al₂O₃ depending on the concentration of the Y₂O₃ doping impurity and the annealing temperature of the powder mixtures (800 and 900°C). The effect of mutual protection against crystallization was discovered, which results in mutual inhibition of crystallization processes in Al₂O₃–Y₂O₃ powder systems. By X-ray diffraction analysis, the formation of a phase of yttrium-aluminum garnet Y₃Al₅O₁₂ (YAG) in ceramics has been established. The dependence of the mechanical characteristics of the materials under study on the amount and size of the formed phase YAG has been revealed.

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