Heat-Treatment Optimizing Study on Soft Magnetic Properties of FeCuNbSiB Nanocrystalline Alloys
This job was focused on the annealing technique of large-size nanocrystalline core with height of 50 mm, to meet the low core loss requirement of large-size nanocrystalline core used in large-capacity high-frequency transformer. Two typical nanocrystalline alloys, Fe73.5Cu1Nb3Si15.5B7 and Fe73.5Cu1N...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
State Grid Energy Research Institute
2022-02-01
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| Series: | Zhongguo dianli |
| Subjects: | |
| Online Access: | https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202007232 |
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| Summary: | This job was focused on the annealing technique of large-size nanocrystalline core with height of 50 mm, to meet the low core loss requirement of large-size nanocrystalline core used in large-capacity high-frequency transformer. Two typical nanocrystalline alloys, Fe73.5Cu1Nb3Si15.5B7 and Fe73.5Cu1Nb3Si13.5B9 ribbons (hereinafter referred to as B7 and B9) with the width of 50 mm, were selected to investigate the influence of annealing temperatures (330~600℃) on their soft magnetic properties and core losses. The experimental results were demonstrated that B7 and B9 alloys probably started to crystallize as early as annealed at 420 ℃, which is much lower temperature than the widely-held at 500 ℃. The two alloys were obtained the lowest core losses by being annealed at 550℃ and 580℃, respectively. However, they showed the highest permeability and the lowest coercivity when annealed at 500℃ and 550℃, respectively. The core losses of B7 alloy was continued to reduce through by transversal field annealing, and the lowest value of Pcm(0.5T/20k) was 7.3W/kg, which is the lowest as far as we know. According to the measured data, the core losses of nanocrystalline magnetic core can be described by \begin{document}$ {P}_{{\rm{cm}}}=0.5{f}^{1.42}{{B}_{{\rm{m}}}}^{2.27} $\end{document} in fractional method, and has been confirmed by experimental results. |
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| ISSN: | 1004-9649 |