کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8156548 | 1524847 | 2015 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hydrogenation and disproportionation of SmCo5 compound by high energy ball milling in heptane
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
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چکیده انگلیسی
A traditional hydrogenation disproportionation desorption recombination (HDDR) technique succeeds in fabricating bonded Nd-Fe-B magnet while encounters difficulty in the fabrication of Sm-Co magnet, due to the higher thermodynamic stability of the Sm-Co compounds against the disproportionation by hydrogen. To induce the disproporationation of Sm-Co compounds, high pressure hydrogen under high temperature has to be employed. This paper reports a hydrogenation and disproporationation reactions of SmCo5 compound that does not involve gaseous hydrogen: high energy ball milling in heptane. The H atom comes from heptane. Being milled for more than 600 min, the SmCo5 phase completely disproportionates into Sm hydride (SmH2±δ) and cubic Co. Heating the disproportionated powder in vacuum from room temperature to 800 °C, two desorption processes, one between 200 and 400 °C and the other around about 600 °C, were observed. The desorbed gas is proved to be hydrogen by gas chromatography. The Heated product consists of mainly hexagonal SmCo7 phase with a TbCu7 structure. The coercivity of SmCo7 phase is larger than 1 T, being able to meet the demand of permanent magnetic application. Excess high energy ball milling results in the appearance of minor SmCoC2 and cubic Co phases.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 374, 15 January 2015, Pages 317-320
Journal: Journal of Magnetism and Magnetic Materials - Volume 374, 15 January 2015, Pages 317-320
نویسندگان
J.J. Zhang, Y. Yan, H.M. Gao, H.M. Geng, X.Y. Feng, Z.P. Hou, H.D. Li, W.Q. Wang, F. Su, X.B. Du,