کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1464095 989656 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ca-α SiAlON hollow spheres prepared by carbothermal reduction-nitridation from different SiO2 powders
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Ca-α SiAlON hollow spheres prepared by carbothermal reduction-nitridation from different SiO2 powders
چکیده انگلیسی
The formation process of hollow spheres composed of nanosized Ca-α SiAlON particles was investigated using SiO2 starting powders with different characteristics in particle size, shape and crystalline state. TEM observations showed Ca-α SiAlON hollow spheres composed of a large number of nanosized particles in the products prepared at 1450 °C for 120 min in nitrogen. In all systems, the Ca-α SiAlON hollow spheres were always produced through an intermediate Si-Al-Ca-O liquid phase in the same mechanism, regardless of the characteristics of SiO2 starting powders used. Spherical solid particles consisted of amorphous phase containing Si, Al, Ca, O and a small amount of N were generated at the initial stage of carbothermal reduction-nitridation. These spherical solid particles changed into hollow particles with the progression of the reaction from the liquid phase to the crystalline Ca-α SiAlON with increasing temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 36, Issue 5, July 2010, Pages 1553-1559
نویسندگان
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