A kind of iron-based amorphous alloy with high saturation magnetic induction intensity and its preparation method

Abstract

The invention relates to an iron-based amorphous alloy with high saturation magnetic induction and a preparation method thereof. The chemical formula is: Fe a Si b B c mn d m e , a, b, c, d and e in the expression represent the atomic percentage content of each corresponding component, wherein 82.5≤a≤85.3, 2≤b≤6, 7≤c≤15, 0.2≤d≤0.5 , 0.05≤e≤0.1, and a+b+c+d+e=100%; the M is one of Mg, Ca or a combination thereof; the iron-based amorphous alloy of the present invention satisfies the requirements of plane casting and rapid quenching Under the premise of the strong amorphous forming ability required for the preparation of wide-width strips, it also has the advantages of high saturation magnetic induction, low coercive force and high magnetic permeability.

Description

technical field [0001] The invention relates to the field of amorphous soft magnetic alloys in functional materials, in particular to an iron-based amorphous alloy with high saturation magnetic induction and a preparation method. Background technique [0002] Since its appearance in 1967, amorphous soft magnetic alloys have attracted great attention immediately, and have become one of the hotspots in material research in recent decades. The formation process of amorphous soft magnetic alloy is to rapidly cool the molten metal liquid by rapid quenching method, so that the atoms are frozen before moving and rearranging, and the molten state does not need to be arranged. Because of its irregular arrangement of atoms, non-periodicity, no grain boundaries, few pinning points or pinning lines of magnetic domains, and small magnetic crystal anisotropy, it has good soft magnetic properties; including coercive Small force, high magnetic permeability, high magnetic induction, high re...

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Problems solved by technology

However, because the alloy contains 18% cobalt element, the cost of raw materials is too high, and there is still no large-scale application at present.

[0008] U.S. Patent No. 4,226,619 discloses an amorphous Fe-B-C alloy whose saturation magnetic induction exceeds 1.7T. The typical composition is Fe 86 B 7 C 7 The saturation magnetic induction of the alloy reaches 1.74T, but due to the low amorphous forming ability, the high coercive force of the alloy, and the high brittleness of the quenched strip, it cannot be practically popularized and applied.

[0009] Hitachi Metals discloses a Fe-Si-B-C alloy in the CN1721563A patent, its saturation magnetic induction reaches 1.64T, but its preparation process uses a carburizing process, which greatly increases the complexity of the process

[0010] In the patent CN1356403A, Nippon Steel Corporation announced a Fe-Si-B-C-Mn amorphous alloy with high iron content. The iron content is between 82-90%, and its saturation magnetic induction reaches 1.75T. However, due to excessive pursuit of saturation Magnetic induction intensity, ignoring the limitation of amorphous forming ability, unreasonable design of alloy composition

Its typical high iron content components such as Fe 86.7 Si 2.3 B 8.9 C 0.8 mn 1.1 The amorphous formation ability of etc. is too low, and the completely amorphous sample cannot be prepared by the conventional rapid quenching process, and the magnetic properties are poor.

Its typical low iron content components such as Fe 82.4 Si 2.3 B 8.8 C 0.5 mn 5.8 The content of Mn element in the alloy is high, and the saturation magnetic induction is low

In addition, the saturation magnetic induction value of the example in this patent is significantly higher than the normal value, which may be caused by test errors or that the sample is not in an amorphous state.

[0011] New Japan Iron and Steel Company discloses another kind of low iron content Fe-Si-B-C-Mn amorphous alloy in patent CN101589169A, the iron content of alloy is between 78-86%, yet the Mn content of this alloy 6-20% Significantly reduce the saturation magnetic induction of the alloy. In addition, the excessively high Mn content and C content greatly increase the difficulty of alloy melting and the requirements of the strip making process.

[0012] Antai Technology Co., Ltd. announced a high saturation magnetic induction amorphous alloy in the patent CN101840764A. Its preferred component silicon content is higher, exceeding 5%, and the amorphous formation ability is low. In addition, the saturation magnetic induction value error of the embodiment in this patent is relatively large. Large, the saturation magnetic induction of similar components is significantly different, which may be caused by test errors, or that the sample is not amorphous

[0013] U.S. Patents US5958153A and US5626690 disclose a kind of (FeSiBC) with high amorphous forming ability 100-x mn x Alloy, its critical thickness is between 40-90m, but the alloy has low iron content and low saturation magnetic induction

[0014] The method of slag removal is a common method for removing impurities in industrial raw materials in metallurgy. It has been matured in other alloys, and there are already many patents on slag removers, purifiers, and slag removers, such as Japanese patent JMn2008231463A, JMn2002105526 Chinese patent CN101840764A , CN102383070A, but these patents are not suitable for iron-based amorphous alloys

[0015] Antai Technology Co., Ltd. announced a slag remover for amorphous alloy melt in Chinese patent CN102337485A. The slag remover is mainly composed of silicon oxide, calcium oxide, oxide shed, and rare earth elements. 78 Si 9 B 13 The alloy has a very good slag removal effect, but because it contains rare earth elements, it is obviously not suitable for the high magnetic induction intensity amorphous alloy containing phosphorus in this patent

Because not only the cost of the slag remover is high, but also the rare earth itself is easy to combine with phosphorus to form refractory inclusions

[0016] In summary, there is currently a lack of high magnetic induction strength amorphous soft magnetic alloys and their preparation methods based on industrial raw materials and industrial strip-making processes in the market

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