Influence of cryochemical and ultrasonic processing on the texture and thermal decomposition of xerogels and properties of nanoceramics in the ZrO2〈Y2O3〉–Al2O3 system

• Published in: Inorganic materials Vol. 53; no. 6; pp. 640 - 647
• Main Authors: Morozova, L. V., Kalinina, M. V., Arsent’ev, M. Yu, Shilova, O. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.06.2017; Springer Nature B.V
• Subjects: Aluminum oxide; Chemistry; Chemistry and Materials Science; Crystallites; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Low temperature; Materials Science; Mechanical properties; Solid solutions; Thermal decomposition; Ultrasonic processing; Xerogels; Yttrium oxide; Zirconium dioxide; agglomerates; nanoceramics; nanopowders; tetragonal solid solution; xerogels; zirconia; consolidation
• ISSN: 0020-1685; 1608-3172
• DOI: 10.1134/S0020168517060115

We have studied the influence of cryochemical and ultrasonic processing on the formation, structure, particle size, and thermal decomposition of xerogels in the ZrO 2 〈Y 2 O 3 〉–Al 2 O 3 (20 wt %) system. Nanopowders of tetragonal-zirconia-based solid solutions with a high degree of tetragonality ( c / a = 1.4366) have been synthesized. Al 2 O 3 has been shown to slow down t -ZrO 2 crystallite growth in the temperature range 600–1400°C. We have optimized nanopowder consolidation conditions, obtained nanoceramics stable to low-temperature “aging” in a humid medium, and investigated their physicochemical and mechanical properties.