کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1474291 991084 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Densification of fine-grained alumina ceramics doped by magnesia, yttria and zirconia evaluated by two different sintering models
ترجمه فارسی عنوان
ضخیم شدن سرامیک آلومینیوم ریز دانه ای که توسط منیزیم، یتریا و زیرکونیا تهیه شده توسط دو مدل مختلف پخت
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی

The influence of various dopants (500 ppm MgO and Y2O3; 250 ppm ZrO2) on sintering of fine-grained alumina ceramics was evaluated by high-temperature dilatometry. The apparent activation energy of sintering was estimated with the help of Master Sintering Curve and a model proposed by Wang and Raj. The densification kinetics was controlled by at least two mechanisms operating at low (higher activation energy) and high (lower activation energy) densities. Good agreement between the activation energies calculated with both models was observed for low as well as for high densities. The lowest value of activation energy exhibited undoped alumina; the addition of MgO resulted in slight increase of the activation energy. Y2O3 and ZrO2 significantly inhibited the densification, which was reflected in the higher sintering activation energies. The low activation energies in the final sintering step indicates the importance of proper choice of sintering temperature, namely in the two-step sintering process.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 34, Issue 16, December 2014, Pages 4363–4372
نویسندگان
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