Al2O3-Based Ceramic Composites with a High Brittle Fracture Resistance

— We examine synthesis conditions of precursors to ZrO 2 –Al 2 O 3 –CeO 2 powders modified with calcium cations. The precipitation procedure and the aging of reaction systems of precursors to the synthesized composites are shown to influence the morphology and particle size of the nanopowders and th...

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Bibliographic Details
Published in:Inorganic materials 2019-06, Vol.55 (6), p.628-633
Main Authors: Podzorova, L. I., Il’icheva, A. A., Pen’kova, O. I., Antonova, O. S., Baikin, A. S., Konovalov, A. A.
Format: Article
Language:English
Subjects:
Aluminum oxide
Bend strength
Brittle fracture
Calcium
Cerium oxides
Chemistry
Chemistry and Materials Science
Composite materials
Dispersion hardening
Fracture toughness
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Mechanical properties
Morphology
Phase composition
Precursors
Solid solutions
Zirconium dioxide
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Summary:— We examine synthesis conditions of precursors to ZrO 2 –Al 2 O 3 –CeO 2 powders modified with calcium cations. The precipitation procedure and the aging of reaction systems of precursors to the synthesized composites are shown to influence the morphology and particle size of the nanopowders and the evolution of the phase composition, microstructure, and mechanical characteristics of composites prepared from them. The composites offer a high brittle fracture resistance due to the combined effect of transformation and dispersion hardening owing to the presence of T -ZrO 2 -based solid solutions and calcium hexaaluminates (bending strength, up to 1000 MPa; fracture toughness K Ic , up to 10.5 MPa m 1/2 ).
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168519060128