Crystallization kinetics and magnetic properties of Fe63.5Co10Si13.5B9Cu1Nb3 nanocrystalline powder cores |
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| Authors: | Ru-wu Wang Jing Liu Zhen Wang Zhang-hua Gan Zhi-dong Xiang Zhi-hong Lu Yun-bao Li Deng-jing Wang Jie Yuan Yu-hua Wang |
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| Institution: | 1. The Hubei Province Key Laboratory of Refractories and Ceramics Ministry-Province jointly-Constructed Cultivation Base for State Key Laboratory, Wuhan 430081, China;2. Hubei Province Key Laboratory of Systems Science in Metallurgical Process, Wuhan 430081, China;3. College of Materials Science and Metallurgical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China |
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| Abstract: | Amorphous ribbons of the alloy Fe63.5Co10Si13.5B9Cu1Nb3 were prepared by the standard single copper wheel melt spinning technique in air and their crystallization kinetics was analyzed by non-isothermal differential scanning calorimetry (DSC) measurements. The crystallization activation energies (Ex, Ea1 and Ea2) of amorphous ribbons calculated from Kissinger model were 448, 385 and 396 kJ/mol for the first and the second crystallizations, respectively. The Avrami exponent n was calculated from the Johnson–Mehl–Avrami (JMA) equation and was used to identify the crystallization mechanism for the amorphous ribbons. The ribbons were milled into different sized flakes, which were molded subsequently to cores using 3 wt.% epoxy as a binder. The effective permeability of the cores showed high frequency stability and increased with the size of the flakes. For the cores made from small sized flakes (? 75 μm), the quality factor was increased at high frequencies, which was attributed to the reduction in the eddy current loss. |
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