کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1478064 991208 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reaction bonding of mullite (RBM) in presence of scandia Sc2O3
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Reaction bonding of mullite (RBM) in presence of scandia Sc2O3
چکیده انگلیسی

The presence of 3rd group transition metal oxides yttria and lanthana has a strong accelerating influence on the reaction bonding of mullite (RBM) from silicon and α-alumina, even at temperatures below 1350 °C. This is due to the formation of low-viscosity transient liquid phases enhancing Si-oxidation, alumina diffusion and mullite nucleation and growth. The presence of the 3rd group transition metal oxide scandia (Sc2O3) does not show a significant influence on the RBM process up to 1350 °C. Sc2O3 does not form low viscous Sc–Al–Si–O liquid phases which enhance reactivity. Instead, a direct formation of Sc-disilicate Sc2Si2O7 is observed. At temperatures between 1350 and 1550 °C, a slightly enhanced mullite formation due to accelerated solid state diffusion, and the formation of a ternary Sc-rich aluminosilicate is evident.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 28, Issue 2, 2008, Pages 473–478
نویسندگان
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