It is known at temperatures above 1500⁰С the triple solid solutions of zirconia stabilized by alkali-earth metals have been degraded. These phenomena reduce the strength properties of ceramics.  It was logical to assume an increase of physical-mechanical properties of the composite materials prepared from nanostructured refractory оxides powders.  

The present work is devoted to research of interaction of оxide nanostructured powders in the triple systems Al₂O₃-ZrO₂-MgO and Al₂O₃-ZrO₂-Y₂O₃, and an influence of composition and production method on structure and properties of composite refractory ceramics.

For preparation of composites  two methods were used. In the first way earlire prepared three-component nanostructured fibers were crushed, graded on fractions and were formed by a static pressure. On the second way three-component powders were prepared by sedimentation of gel hydroxide of aluminium with simultaneous introduction in gel the synthesized fibrous nanostructured powders partially stabilized (MgO) zirconia. The samples were pressed and annealed in oxidizing atmosphere at the temperatures from 100 up to 1600⁰С. Then structure and physical-mechanical properties of ceramic samples were investigated. Due to high dispersity and reactivity of nanostructured powders at the 550-600⁰С from metal oxides the triple solid solutions were formed which strengthened the composite. Density annealed at the 1600⁰С ceramic samples of partially stabilized zirconia (PSZ) and composite powder of 80 % PSZ : 20 % Al₂O₃ amounted 5,96 and 5,54 g/cm³, it’s value went down up to 4,2 g/cm³ with increasing in content Al₂O₃ to 80 mas. %. The open porosity did not exceed 0,2 – 0,4 %. The fibrous oxide three-component powders can be used as fillers for composites and dense ceramics.

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