Transformation of Electron‐Beam Physical Vapor‐Deposited 8 wt% Yttria‐Stabilized Zirconia Thermal Barrier Coatings
作者： Vanni Lughi , David R. Clarke
DOI: 10.1111/J.1551-2916.2005.00452.X
关键词:
摘要: Yttria-stabilized (8.6 mol% YO1.5) zirconia thermal barrier coatings evolve at high temperatures from the “non-transformable,” metastable tetragonal-prime phase in their as-deposited condition to a mixture of tetragonal and cubic phases. The kinetics transformation 1200° 1425°C are reported based on X-ray diffraction measurements. Complementary Raman spectroscopy measurements indicate sharpening bands 263 465 cm−1 that is attributed systematic decrease disorder Y3+ oxygen vacancies with annealing. No monoclinic form observed immediately after high-temperature treatment. However, partial occurs prolonged time (months) room temperature those samples treated 1425°C, indicating development isothermal martensite.
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