کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1475417 991118 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Molten salt attack on t′ yttria-stabilised zirconia by dissolution and precipitation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Molten salt attack on t′ yttria-stabilised zirconia by dissolution and precipitation
چکیده انگلیسی

Degradation due to molten salt attack is one of the failure mechanisms of thermal barrier coatings. Thermochemical attack of the salt mixture Na2SO4–30 mol% NaVO3 on ZrO2–8 mol% YO1.5 (8YSZ) at 950 °C was studied by two types of experiments. Sintered compacts were exposed to 25 mg cm−2 salt dosage for up to 96 h. In the other set of experiments, 10–35 wt.% 8YSZ powder was mixed with the salts to study the dissolution of 8YSZ in the molten salt. The role of volatile losses was also examined. The results show that more than 25 wt.% 8YSZ dissolves in the sulphate-vanadate melt at 950 °C, followed by slow reactions to form YVO4 and NaYV2O7 at 950 °C. The unreacted Y2O3 and monoclinic ZrO2 precipitate out separately during rapid cooling (∼300 °C/min). Slow cooling at ∼3 °C/min leads to the formation of ZrOS apart from ZrO2 and Y2O3.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 33, Issue 10, September 2013, Pages 1867–1874
نویسندگان
, ,