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

机译：通过施加电场增强氧化铝掺杂YSZ的热稳定性

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The metastable tetragonal (t') phase in YSZ exhibits significant thermal stability, high strength, excel lent toughness and high temperature creep resistance (unlike stable tetragonal phase). Because of its properties, f phase YSZ would seem to be ideally suited for elevated temperature applications. However, stabilizing of the f 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 exter nal polarization (3 V) to the YSZ layer at high temperature (700 ℃) for 20 min. This process results in a fully t' phase YSZ with the appearance of t'' phase within f domain boundaries. Arguments are put forth to explain this transformation from the thermodynamic and kinetic point of view.
机译：YSZ中的亚稳态四方相（t'）具有显着的热稳定性，高强度，优异的韧性和耐高温蠕变性（与稳定的四方相不同）。由于其特性，f相YSZ似乎非常适合高温应用。然而，由于f相的非平衡性质，使其稳定是困难的。引入电处理作为稳定氧化锆材料中亚稳相的方法。处理包括在高温（700℃）下向YSZ层施加外部极化（3 V）20分钟。该过程导致完全t'相YSZ，并且在f域边界内出现t''相。提出了从热力学和动力学的角度解释这种转变的论点。

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