کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9803565 | 1516469 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nanorods of HfB2 from mechanically-activated HfCl4 and B-based powder mixtures
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Nanorods of HfB2 from mechanically-activated HfCl4 and B-based powder mixtures Nanorods of HfB2 from mechanically-activated HfCl4 and B-based powder mixtures](/preview/png/9803565.png)
چکیده انگلیسی
Besides being an established method of synthesis of nanomaterials and a method for inducing chemical reactions during grinding, high-energy ball-milling is further a way, with potential industrial applications, of activating powdered solids which react then at lower temperature than usual and possibly lead to the formation of original materials. Hafnium diborides with an AlB2 type-structure, which are difficult to obtain as single crystals, are synthesized in that way by a two-step process. It consists first in a mechanical activation stage of ph-HfCl4Â +Â B and ph-HfCl4Â +Â BÂ +Â Mg powder mixtures, where ph-HfCl4 is a partially hydrated hafnium tetrachloride, then in an isothermal annealing treatment of the activated powders in flowing argon. According to the composition of the initial mixtures and to the time and temperature of the argon annealing treatment, either nanosized facetted grains or single crystalline nanorods of HfB2 are obtained.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 398, Issues 1â2, 2 August 2005, Pages 208-218
Journal: Journal of Alloys and Compounds - Volume 398, Issues 1â2, 2 August 2005, Pages 208-218
نویسندگان
E. Barraud, S. Bégin-Colin, G. Le Caër,