کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7898831 1510137 2018 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Kinetic and thermodynamic effects of manganese as a densification aid in yttria-stabilized zirconia
ترجمه فارسی عنوان
اثرات سینتیک و ترمودینامیکی منگنز به عنوان یک کمپلکس در زیرکونیا تثبیت شده با اتریا
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
This work demonstrates the role of Mn as an effective sintering aid in Yttria-Stabilized-Zirconia (YSZ) is a result of the concomitant reduction of activation energies and change of interfacial energies caused by Mn segregation. Kissinger analyses of the heat of sintering showed a decrease in activation energy from 219.9 kJ/mol for YSZ to 103.4 kJ/mol for YSZ containing 3-mol% Mn. Direct microcalorimetry analyses showed that the average surface and grain boundary energies of YSZ decreased from 0.94 and 0.71 J/m2, respectively, to 0.70 and 0.17 J/m2 for 3-mol% Mn doped YSZ. The decrease in the ratio between surface and grain boundary energies indicates an increase in dihedral angle from 137.5° to 166.6°, meaning an increase in sintering stress. Segregation of manganese to grain boundaries was experimentally observed and is discussed to be responsible for both kinetic and thermodynamic changes in the system while suggesting interconnection by the thermodynamic extremal principle.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 38, Issue 4, April 2018, Pages 1750-1759
نویسندگان
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