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
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
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 sâ1), 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
Journal: Ceramics International - Volume 43, Issue 1, Part A, January 2017, Pages 316-323
نویسندگان
Leandro Pelegrini, Luiz Eloi Vieira Junior, João Batista Rodrigues Neto, Dachamir Hotza,