Effect of the ZrO2-Based Solid Solution on the Low-Temperature Phase Stability of ZrO2−Y2O3−CeO2 Materials

• Published in: Powder metallurgy and metal ceramics Vol. 61; no. 11-12; pp. 727 - 735
• Main Authors: Marek, I. O., Dudnik, O. V., Korniy, S. A., Redko, V. P., Ruban, O. K.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-03-2023; Springer Nature B.V
• Subjects: Aging; Ceramics; Cerium oxides; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Diffusion rate; Glass; Low temperature; Low temperature resistance; Materials Science; Medical materials; Metallic Materials; Natural Materials; Oxygen; Phase stability; Phase transitions; Solid solutions; Yttrium oxide; Zirconium dioxide; system; ZrO; low-temperature phase stability; Y; CeO; costabilization; aging process; O; based solid solution
• ISSN: 1068-1302; 1573-9066
• DOI: 10.1007/s11106-023-00359-4

The low-temperature phase stability of 97 mol.% ZrO
2
–3 mol.% Y
2
O
3
, 95 mol.% ZrO
2
–3 mol.% Y
2
O
3
–2 mol.% CeO
2
, 92.5 mol.% ZrO
2
–2.5 mol.% Y
2
O
3
–5 mol.% CeO
2
, 90 mol.% ZrO
2
–2 mol.% Y
2
O
3
–8 mol.% CeO
2
, and 88 mol.% ZrO
2
–12 mol.% CeO
2
materials in the ZrO
2
–Y
2
O
3
–CeO
2
system was studied. The phase stability was determined through accelerated aging in hydrothermal conditions for 7 h and 14 h. The evaluation criterion was the amount of the M-ZrO
2
phase that formed in the samples when aged in hydrothermal conditions. The properties of the materials were analyzed by X-ray diffraction and electron microscopy. The T-ZrO
2
→ M-ZrO
2
phase transformation occurred to varying degrees in all samples except for the 88 mol.% ZrO
2
–12 mol.% CeO
2
sample after the first and second aging cycles. The smallest amount of M-ZrO
2
formed in the 90 mol.% ZrO
2
–2 mol.% Y
2
O
3
–8 mol.% CeO
2
sample. After both aging cycles, the fracture patterns for the 90 mol.% ZrO
2
–2 mol.% Y
2
O
3
–8 mol.% CeO
2
and 88 mol.% ZrO
2
–12 mol.% CeO
2
samples did not change significantly. With the complex stabilization of zirconia by yttria and ceria, the T-ZrO
2
→ M-ZrO
2
phase transformation was controlled in the aging process by the number of oxygen vacancies resulting from the presence of yttria and by the stresses induced by the presence of ceria in the solid solutions. The number of oxygen vacancies decreased as ceria content in the ZrO
2
-based solid solutions increased, slowing down the rate of water diffusion and enhancing the low-temperature phase stability in the ZrO
2
–Y
2
O
3
–CeO
2
materials. The effectiveness of using the 90 mol.% ZrO
2
–2 mol.% Y
2
O
3
–8 mol.% CeO
2
and 88 mol.% ZrO
2
–12 mol.% CeO
2
composites for the microstructural design of medical materials with increased resistance to low-temperature degradation in humid environments was shown.