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Application and Classification of Iron-Based Nanocrystalline Soft Magnetic Alloys

After being applied to electronic devices, iron-based nanocrystalline soft magnetic alloys are not only lightweight, energy-saving, and highly sensitive, but also have simple production processes and low cost. They are alternatives to traditional soft magnetic materials such as silicon steel, ferrite, and permalloy. It is also a research hotspot for soft magnetic materials used in magnetic components in the power and electronic communications industries, and is an important material for the development of new and high technologies in the future.
Iron-based nanocrystalline soft magnetic alloys are mainly divided into three types, which are 1) Finemet alloys, and the composition is Fe-M-Si-Cu-B (where M=Nb, Cr, V, W, Mo, etc.; 2) Nanopern Alloy, composition Fe-MB (where M = Zr, Hf, Nb, etc.; 3) Hitpern alloy, the composition of (Fe, Co)-MB (where M = Zr, Hf, Nb, etc. All three showed high saturation Magnetic strength, low coercive force, high magnetic permeability and low high frequency loss are excellent soft magnetic properties.
1, Finemet alloy
The typical composition of Finemet-type nanocrystalline soft magnetic alloy is: Fe73.5Cu1Nb3Si13.5B9. The performance parameters are: Bs=1.24T, Hc=0.53A/m, μe (1kHz=1.0×105. Finemet alloy is developed early, the production process is simple, and has excellent soft magnetic properties. The performance study is: the crystallization occurs mainly After 500°C, the nanocrystallites were fully crystallized and uniformly distributed at 560°C, and the AC magnetic properties were best when the annealing temperature was 540-560°C.The results also showed that the coercivity with annealing temperature after complete nanocrystallization When it rises and increases, the remanence remains basically unchanged, and the magnetic loss at high frequencies drops significantly after annealing.
2. Nanopern alloy
Nanopern-type nanocrystalline soft magnetic alloy typical composition: Fe90Zr7B3. The performance parameters are: Bs=1.63T, Hc=5.8 A/m, μe (1 kHz=2.2×105). The performance study is that since the content of solute elements contained in the α-Fe phase obtained by crystallization is much lower than that of the Finemet alloy, The Bs value is higher, and its loss P1.4/50 is lower than that of the orientation silicon steel and the FeSiB amorphous alloy at low frequencies, and its loss is smaller than that of the Fe-Ni permalloy and can be used with the Co-based amorphous alloy at high frequencies. State alloys are comparable to others.
The disadvantage is that the alloy contains more easily oxidized elements Zr, Hf, and Nb, and the melting and quenching belt has a higher temperature, and it needs to be conducted under vacuum or gas protection, which hinders its application and makes industrialization difficult.
3, Hitpern alloy
Hitpern alloy nanocrystalline soft magnetic alloy typical composition: Fe44Co44Zr7B4Cu1. The performance parameters are: Bs=2.0T, μe (1kHz=1.0×104. Hitpern alloy. Hitpern alloy was originally obtained by substituting Co for part of Fe on the basis of Nanopern alloy. The performance study is: its working temperature can be as high as 600°C. It can be applied at 550 °C, while Finemet alloy and Nanopern alloy can only be applied below 200 ° C. In addition, Hitpern alloy has the best magnetic properties when Fe and Co content are equivalent.

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