کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1487740 1510707 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The influence of metal Mg on micro-morphology and crystallinity of spherical hexagonal boron nitride
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
The influence of metal Mg on micro-morphology and crystallinity of spherical hexagonal boron nitride
چکیده انگلیسی


• The action mechanism of Mg to the synthesis of spherical BN was explored.
• The influence of Mg content on the crystallinity of h-BN powders was studied.
• Even if not added any template, the spherical h-BN could be prepared.

This search used the boric acid and borax as a source of boron, urea as a nitrogen source, Mg as metal catalyst, and thus prepared different micro-morphology and crystallinity hexagonal boron nitride powders under a flowing ammonia atmosphere at a nitriding temperature of 750 °C. The effect of Mg content on the crystallinity and micro-morphology of hexagonal boron nitride powders was studied, and the Mg action mechanism was explored. Without the added surfactant, the graphitization index (GI) was 6.87, and the diameter of the spherical h-BN was bigger. When the added Mg were 0.1 g, 0.3 g, 0.5 g and 0.7 g, the (GI) decreased to 6.04, 5.67, 4.62 and 4.84, respectively. When the Mg content was higher (0.9 g), GI value increased rapidly, and the crystallinity became bad. When the Mg content was 0.5 g, the dispersion of h-BN powders was at its optimum and refinement apparently, and the crystallinity at its highest.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 68, August 2015, Pages 179–184
نویسندگان
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