[논문]Effect of Ca and Al Additions on the Magnetic Properties of Nanocrytalline Fe-Si-B-Nb-Cu Alloy Powder Cores

Moon, Sun Gyu; Kim, Ji Seung; Sohn, Keun Yong; Park, Won-Wook

doi:10.4283/jmag.2016.21.2.192

Effect of Ca and Al Additions on the Magnetic Properties of Nanocrytalline Fe-Si-B-Nb-Cu Alloy Powder Cores 원문보기

Journal of magnetics, v.21 no.2, 2016년, pp.192 - 196

Moon, Sun Gyu (Department of Nano System Engineering, Inje University) , Kim, Ji Seung (Department of Nano System Engineering, Inje University) , Sohn, Keun Yong (Department of Nano System Engineering, Inje University) , Park, Won-Wook (Department of Nano System Engineering, Inje University)

Abstract ▼ AI-Helper

The Fe-Si-B-Nb-Cu alloys containing Ca and Al were rapidly solidified to thin ribbons by melt-spinning. The ribbons were ball-milled to make powders, and then mixed with 1 wt.% water glass and 1.5 wt.% lubricant. The mixed powders were burn-off, and then compacted to form toroidal-shaped cores, which were heat treated to crystallize the nano-grain structure and to remove residual stress of material. The characteristics of the powder cores were analyzed using a differential scanning calorimetry (DSC) and a B-H meter. The microstructures were observed using transmission electron microscope (TEM). The optimized soft magnetic properties (${\mu}_i$ and $P_{cv}$) of the powder cores were obtained from the Ca and Al containing alloys after annealing at $530^{\circ}C$ for 1 h. The core loss of Fe-Si-B-Nb-Cu-based powder cores was reduced by the addition of Ca element, and the initial permeability increased due to the addition of Al element.

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가설 설정

The annealing temperature (T_a) dependency of the core loss (P_cv) is shown in Fig. 3. The core loss of the Fe-based powder cores was measured at 100 kHz under an applied magnetic field of 0.1 T. The lowest value (P_cv = 1100 mW/cm³) was obtained from the Ca containing powder core when annealed at 530 ℃ for 1 h. The core loss of the Fe-Si-B-Nb-Cu alloy containing Ca and Al showed a little higher value (P_cv = 1171 mW/cm³) than that of Ca containing alloy powder core.

제안 방법

Further, according to the reported and previous studies [30-32], the addition of Al caused the anisotropy and magnetostriction to become nearly zero so that the magnetic properties were improved, and the addition of Ca increased the electrical resistivity and reduced the core loss of the toroidal-shaped ribbon cores. In this study, the effect of Ca and Al additions on the magnetic properties of nanocrytalline Fe-Si-B-Nb-Cu alloy powder cores has been investigated at a high frequency range, and their microstructural changes were also observed after heat treatment at various temperatures.

성능/효과

The optimized soft magnetic properties (µ_i and P_cv) of the powder cores were obtained from the Ca and Al containing alloys after annealing at 530 ℃ for 1 h. The optimized magnetic properties of each core alloy, annealed at 530 ℃ for 1 h, were summarized in Table 2. Based on the results, the core loss of Fe-Si-B-Nb-Cu-based powder cores was reduced mainly by the addition of Ca element, and the initial permeability increased effectively due to the addition of Al element.
2. The grain size of Fe-Si-B-Nb-Cu alloy powder cores containing Ca and Al was very fine compared to the other alloy powders, implying that these additional elements could inhibit the grain growth of the Fe-based alloy powders, and the stored energy generated during the powder process didn’t pronouncedly increase the driving force for grain growth.
2. The initial permeability of the Fe-Si-B-Nb-Cu alloy containing Ca and Al showed the high value (µi = 95) when annealed at 530 ℃ for 1 h, compared to the FeSi-B-Nb-Cu alloy (µi = 88) and the Ca-containing alloys (µi = 82).
3. The Fe-based alloy ribbons containing Ca and Al showed the desireable characteristics for powder making in that the alloy ribbon was easily purverized because of Ca addition, which is considered very helpful in terms of the energy saving for the powder fabrication.
Based on the results, it can be concluded that Ca and Al additions generally improve the thermal stability of the nanocrystalline structure of the α-Fe(Si) phase [34- 38].
On the contrary, it was not easy to identify the Ca clusters or its compounds in the matrix and boundaries, implying that more Ca amount should be added to understand its effect on the stabilization of the nanostructure clearly. Based on the results, the additions of Ca and Al decreased the growth rate of the nano-grain, which stabilized the nanostructure of Fe-Si-B-Nb-Cu base alloys and improved the magnetic properties such as the initial permeability and core loss of the powder cores. In this respect, it can be concluded that the addition of Ca and Al to the Fe-Si-BNb-Cu base alloys was effective for the improvement of the soft magnetic properties to expand the application areas of soft magnetic powder cores.

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Effect of Ca and Al Additions on the Magnetic Properties of Nanocrytalline Fe-Si-B-Nb-Cu Alloy Powder Cores 원문보기

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Effect of Ca and Al Additions on the Magnetic Properties of Nanocrytalline Fe-Si-B-Nb-Cu Alloy Powder Cores 원문보기

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