کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10629598 | 991080 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Phase and fracture toughness evolution during isothermal annealing of spark plasma sintered zirconia co-doped with Yb, Gd and Nd oxides
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Dense pellet of rare-earth oxide (5YbO1.5 + 1.5GdO1.5 + 1.5NdO1.5) stabilized zirconia, a candidate thermal barrier composition, was prepared by spark plasma sintering. Isothermal annealing was carried out at 1250 °C up to 192 h. X-ray diffraction and Raman spectroscopy were used to characterize the phases. Cubic precipitates formed in the initial tetragonal phase from 6 h, with volume fraction of 22.31% after 192 h. 15.35 vol.% of monoclinic phase was observed in XRD at 192 h along with cubic and two tetragonal phases. Indentation toughness increased by 49% from 155 ± 24 J mâ2 at 0 h to 231 ± 71 J mâ2 at 6 h of annealing and it decreased towards the initial value upon further annealing to 192 h. Ferroelastic toughening dominates until transformation toughening ensues at 192 h. The toughness is consistently higher than for singly doped, sintered tâ² zirconia pellets that are reported in the literature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 35, Issue 6, June 2015, Pages 1879-1887
Journal: Journal of the European Ceramic Society - Volume 35, Issue 6, June 2015, Pages 1879-1887
نویسندگان
Mohan B. Ponnuchamy, Ashutosh S. Gandhi,