The 1300 °C Isothermal Section in the Al2O3-Y2O3-Nb2O5 System

• Published in: Journal of phase equilibria and diffusion Vol. 43; no. 3; pp. 393 - 400
• Main Authors: Zaidan, Denilson Wagner, de Freitas, Bruno Xavier, Coelho, Gilberto Carvalho, Nunes, Carlos Angelo, dos Santos, Claudinei, Ramos, Erika Coaglia Trindade, Ramos, Alfeu Saraiva
• Format: Journal Article
• Language: English
• Published: New York Springer US 2022; Springer Nature B.V
• Subjects: Aluminum oxide; Ceramics; Composites; Crystallography and Scattering Methods; Disks; Engineering Thermodynamics; Glass; Heat and Mass Transfer; Heat treatment; Metallic Materials; Natural Materials; Niobium oxides; Phase stability; Physics; Physics and Astronomy; Room temperature; Ternary systems; Thermodynamic equilibrium; Thermodynamics; Yttrium oxide; Y; system; Al; Nb; phase diagrams; O
• ISSN: 1547-7037; 1863-7345; 1934-7243
• DOI: 10.1007/s11669-022-00973-6

Phase stability in the Al
2
O
3
-Nb
2
O
5
-Y
2
O
3
ceramic system at 1300 °C was experimentally investigated. Disks samples fabricated from homogenized powders were uniaxially pressed at room temperature and heat treated at 1300 °C for 222 hours under laboratory atmosphere to achieve thermodynamic equilibrium. As results, the microstructures of the heat-treated samples did not exhibit pseudo-ternary phases and the phase relations confirmed nine three-phase fields in the proposed isothermal section at 1300 °C.