کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1475038 991107 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermal and mechanical properties of crack-designed thick lanthanum zirconate coatings
ترجمه فارسی عنوان
خواص حرارتی و مکانیکی پوشش های لانتانیم ضخامت زیرکونات ضخامت
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی

Vertical cracks are beneficial in thermal barrier coatings due to enhanced thermo-mechanical compliance. Accordingly, an aqueous nitrate based precursor solution was atomized on stainless steel substrates by spray pyrolysis to deposit thick crack-designed lanthanum zirconate coatings. Coatings with designed crack patterns were deposited and characterized by electron microscopy, tribology, Vickers indentation, and thermal diffusivity. The crystallization of the coatings was investigated by in situ high temperature X-ray diffraction. The green coatings crystallized from 600 °C and the pyrochlore structure was formed after heat treatment at 1000 °C. Crystalline lanthanum zirconate multilayered coatings with small crack spacing and crack opening exhibited a higher density, a higher hardness, lower thermal diffusivities, and higher thermal conductivities compared to crystalline monolayered coatings of similar thickness with large crack spacing and crack opening. The thermal diffusivity of the coatings, ∼28 mm2/s at room temperature, was similar to the values reported for yttria-stabilized zirconia plasma sprayed coatings.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 34, Issue 4, April 2014, Pages 975–984
نویسندگان
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