کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8153740 | 1524769 | 2018 | 19 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Two growth mechanisms in one-step fabrication of the oxide matrix for FeSiAl soft magnetic composites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Hydrolysis precipitation as a new method was used in the preparation of oxide insulation matrix for FeSiAl soft magnetic composites (SMCs). The growth and composition of the matrix can be tuned by the concentration of the Al(NO3)3 solution, reaction temperature and pH value during the hydrolysis. With optimized Al(NO3)3 concentration of 0.6â¯mol/L and hydrolysis temperature of 75â¯Â°C, two mechanisms have been revealed in the formation of the insulation coating depending on the pH of the Al(NO3)3 solution. When pHâ¯=â¯3, the coating layer contains a mixture of Al2O3 and Fe2O3, while Al2O3 and SiO2 form as the coating for pHâ¯=â¯8. Despite that the Al2O3 dominates for both conditions, it grows via different routes. The Al(OH)3 as the precursor forms through Al3+ hydrolysis and heterogeneous nucleation for pHâ¯=â¯3. With increased pH to 8, the Al3+ directly reacts with OHâ to form Al(OH)3 colloidal particles which adsorb onto the surface of FeSiAl powders via electrostatic attraction. Both mechanisms give rise to satisfactory magnetic performance with high effective permeability (μeâ¯=â¯103.5 and 113.4) and low core loss (Pcvâ¯=â¯278.4â¯mW·cmâ3 and 237.8 mW·cmâ3) for pHâ¯=â¯3 and 8 measured at 100â¯mT, 50â¯kHz.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 452, 15 April 2018, Pages 114-119
Journal: Journal of Magnetism and Magnetic Materials - Volume 452, 15 April 2018, Pages 114-119
نویسندگان
Chen Wu, Xinwei Gao, Guoliang Zhao, Yinzhu Jiang, Mi Yan,