An enhancement in thermal stability of alumina doped YSZ by applying an electric field

作者：Nazarpour S^*; Lopez C; Ramos F; Cirera A

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2011, 528(16-17): 5400-5404.

DOI：10.1016/j.msea.2011.03.076

• YSZ
• Metastable phases
• Electrical treatment
• High temperature stability

The metastable tetragonal (t') phase in YSZ exhibits significant thermal stability, high strength, excellent toughness and high temperature creep resistance (unlike stable tetragonal phase). Because of its properties, t' phase YSZ would seem to be ideally suited for elevated temperature applications. However, stabilizing of the t' phase is difficult due to its non-equilibrium nature. Electrical treatment is introduced as a method to stabilize metastable phases in zirconia material. Treatment consists of applying an external polarization (3 V) to the YSZ layer at high temperature (700 degrees C) for 20 min. This process results in a fully t' phase YSZ with the appearance of t" phase within t' domain boundaries. Arguments are put forth to explain this transformation from the thermodynamic and kinetic point of view.

• 出版日期2011-6-25