Iron-based amorphous-nanocrystalline soft magnetic alloy with high saturation magnetic induction and its application

Abstract

The invention relates to an iron-based amorphous-nanometer crystalline state magnetically soft alloy with high saturation magnetic induction density and an application thereof. FeaSibBcAld series amorphous-nanometer crystalline state magnetically soft alloy is formed by adding a certain amount of Al capable of improving the saturation magnetic induction density of the amorphous alloy into Fe-Si-B series amorphous alloy, wherein a is 78-86 atom percents, b is 2-9 atom percents, c is 9-14 atom percents, and d is 1-5 atom percents. The iron series amorphous-nanometer crystalline magnetically soft alloy has the advantages of being good in formability, high in saturation magnetic induction density, low in cost, corrosion-resistant, simple in process and the like. After stress relief annealing is conducted on the alloy, the saturation magnetic induction density can reach 1.62-1.778T.

Description

technical field [0001] The invention relates to the technical field of amorphous-nanocrystalline alloys, in particular to an iron-based amorphous-nanocrystalline soft magnetic alloy with high saturation magnetic induction and its application. Background technique [0002] After the advent of iron-based amorphous-nanocrystalline soft magnetic materials, due to the special atomic structure of amorphous alloys (long-range disorder, short-range order), it has many properties superior to crystalline materials, such as high resistivity, high Saturation magnetic induction, low iron loss, excellent corrosion resistance, etc. These excellent properties are especially suitable for the performance requirements of transformer cores, transformers, magnetic sensors, etc., and compared with silicon steel sheets, its processing and forming process is simple and does not require special processing technology, so it is considered by scientific researchers as an ideal silicon steel Alternativ...

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Problems solved by technology

[0003] Although iron-based amorphous soft magnetic materials can improve many performances of transformers, they still have the following disadvantages compared with silicon steel sheets widely used in the prior art : First of all, there is still a big gap between the saturation magnetic induction of iron-based amorphous soft magnetic materials and silicon steel sheets (2.000T), such as the typical Fe78Si9s of >B13 is only 1.560T (see Chinese patent document CN101840764A), which means that the reduction of the core size and excitation power of the transformer becomes difficult; secondly, For the filling factor, the general method is to improve the quality of the amorphous strip, mainly the surface finish and uniformity, but due to the limitation of the thickness of the amorphous strip, it is not realistic to have a big improvement in this aspect

For industrial production, the production process is complicated, the optimal process contains C content difficult to control, the cost increases, and the controllability of the process parameters is not strong. At the same time, CO and CO2 gases will generate A certain degree of pollution prevents the green and environment-friendly features of amorphous soft magnetic alloy strip production from being highlighted

[0007] Chinese patent document CN101840764A discloses a kind of addition of trace Mn, Sb, Ti, S, Sn, W in Fe-Si-B-C series amorphous alloy elements to improve the various properties of the strip, but it does not make much contribution to the improvement of the saturation magnetic induction of Fe-Si-B-C amorphous soft magnetic materials, and the S element is generally regarded as a harmful element in the alloy. Elements; the addition of Mn and Sb will greatly reduce the amorphous forming ability and thermal stability of the alloy; W (19.35g / cm3) is a heavy metal, which not only increases the difficulty of alloy smelting, but also Increased production cost of the alloy

This alloy system was researched and developed by Makoto Ya Makoto, a professor at Tohoku University in Japan. The biggest advantage of this alloy is that the saturation magnetic induction can reach up to 1.9T, which meets the requirements for the magnetic properties of power electronics towards miniaturization and thinning. There are some problems in this alloy. For example, the melting point and boiling point of P are 44.2°C and 280°C respectively, which is a volatile element. It is difficult to control the composition during the smelting process of the alloy. At the same time, the volatilization of P will also pollute the factory environment. Conducive to industrialized production

[0018]In summary, although researchers from various countries have made great efforts to modify FeSiB-based amorphous-nanocrystalline alloys, so far There is no alloy system with high saturation magnetic induction and low cost in the market

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