کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5438149 1398181 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Direct coagulation casting of nano-8YSZ powder suspensions using nano-MgO as coagulating agent
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Direct coagulation casting of nano-8YSZ powder suspensions using nano-MgO as coagulating agent
چکیده انگلیسی
New colloidal techniques such as direct coagulation casting (DCC) arise to manufacture dense, homogeneous and nanocrystalline advanced ceramics. In this work, it was possible to obtain a high solid content (72 wt%) aqueous suspension from nano-8YSZ (15-50 nm) using a suitable PAA-NH4 dispersant. Moreover, coagulation was reached by increasing ionic strength mechanism, with an optimized amount of 0.25 wt% nano-MgO (~20 nm) maintaining a low initial viscosity (~60 mPa s at 100 s−1), which corresponds to a suitable rheological behavior for direct casting. An attenuated coagulation rate was found, along a 30-min window process, due to the nanosized MgO particles. The nanosuspension was then successfully cast into a non-porous PVC mould at 25 °C producing a dense structure without cracks after 6 h. High density (~96% T.D.) samples were obtained at 1350 °C/5 h with mean grain sizes of ~800 nm and a cubic phase corresponding to 8 mol% Y2O3 according to XRD analysis.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 43, Issue 1, Part A, January 2017, Pages 316-323
نویسندگان
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