کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7882484 1509607 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mechanical properties of high-temperature-degraded yttria-stabilized zirconia
ترجمه فارسی عنوان
خواص مکانیکی زیرکونیا تثبیت کننده اتریا با درجه حرارت پایین
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
In the pursuit of higher operating temperatures and better durability of thermal barrier coating (TBC) materials, the currently used air-plasma-sprayed (APS) 8 wt.% yttria-stabilized zirconia (8YSZ) ceramic is faced with a phase degradation problem regarding its initial metastable T prime (T′) phase, which results in residual stress and cracks during long-term operations. In this study, we focus on the relationship between the long-term phase transformation and mechanical properties, which facilitates the simulation and prediction of properties under operating conditions. Field-assisted sintering specimens of the pure T′ phase were annealed at 1300 °C for different periods of time to obtain various phase compositions. A nano/micro hybrid structure was observed as the phase transformation developed. The Vickers hardness of the materials increased by 8% due to the precipitation of fine T phase grains. On the other hand, the bending strength decreased by more than 60% when the T′ phase decomposed from 70 to 20 vol.%. A noteworthy reduction in the fracture toughness, along with a decrease in the volume percentage of the T′ phase, was also observed during long-term degradation. Effects of the T′ phase decomposition on mechanical properties are discussed in this paper. This systematic research on the mechanical properties and phase degradation of YSZ is of significant importance in predicting and evaluating the performance evolvement of TBCs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 69, May 2014, Pages 397-406
نویسندگان
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