کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1464136 989657 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigation on the microstructure of self-reinforced Nd-α-sialon ceramics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Investigation on the microstructure of self-reinforced Nd-α-sialon ceramics
چکیده انگلیسی

α-Sialon ceramics doped with Nd2O3 were prepared by hot-pressing sintering at 1900 °C holding for 1 h with a heat preservation for 1 h at 1500 °C. Microscopic observations indicate that elongated α-sialon grains appear and are embedded in the fine equiaxed-grain matrix. A small amount of β-sialon phases and secondary crystallized phases M′ (Nd2Si3−xAlxO3+xN4−x) also exist in the Nd-α-sialon ceramic. A core/shell structure can be found in the elongated α-sialon and β-sialon grains with a high aspect ratio, in which some misfit dislocations surround the core. The 21R AlN-polytype was observed by transmission electron microscopy (TEM), which could not be detected by X-ray diffraction (XRD) due to its trace amount. Different nucleation and growth modes of sialon grains were also discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 34, Issue 1, January 2008, Pages 51–56
نویسندگان
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