کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7899004 1510142 2013 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Rare-earth nitrate additives for the sintering of silicon carbide
ترجمه فارسی عنوان
مواد افزودنی نیترات نیتروژن برای غرق کردن کاربید سیلیکون
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی
Fourteen rare earth elements in their nitrate form were evaluated as sintering additives for β-SiC. All rare earth nitrates transformed to oxides by a reaction with the surface-adsorbed thin SiO2 during heat treatment, which enhanced the density of the SiC monolith without decomposing SiC. In particular, Sc, Yb, Tm, Er and Ho were quite effective sintering additives; a > 99% relative density was observed by the addition of 5 wt.% rare earth oxide, whereas the other rare earth additives (Lu, Dy, Tb, Gd, Eu, Sm, Nd, Ce and La) revealed 77-92% density. Moreover, a fine 156 nm-sized SiC grain could be acquired by Sc addition, whereas the other additives showed a SiC grain size of approximately 1 μm. The mean hardness and KIc of the dense SiC containing rare earth elements were 24-27 GPa and 3.3-5.0 MPa m1/2, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 33, Issues 15–16, December 2013, Pages 2915-2923
نویسندگان
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