Preparation method of nanometer iron-based soft magnetic block

Abstract

The invention discloses a preparation method of a nanometer iron-based soft magnetic block. Nanometer iron-based soft magnetic powder is served as the main raw material. The shape of a nanometer iron-based soft magnetic block to be prepared is designed by professional 3D graphics software on a computer; then, computer graphics processing software decomposes the designed 3D graphics into a series of processing signals controlling laser scanning speed, output power, sintering paths, feeder feeding amount, feeding position and the like by an automatic control device; the feeder and the laser feed and sinter by layers under the control of the signals until the shape of the nanometer iron-based soft magnetic block to be prepared is sintered. The novel nanometer iron-based soft magnetic block is different from the block produced by nanometer ligatures, forms a unified entity, does not have gaps and has favourable permeability; with respect to the known production process of other nanometer soft magnetic blocks, the preparation method has low requirements of environment and technology and does not need to manufacture the corresponding mould in advance.

Description

technical field [0001] The technology belongs to the field of magnetic functional material processing, and in particular relates to a preparation method of a nanometer iron-based soft magnetic block. Background technique [0002] Soft magnetic alloy is one of the important functional materials in the electronics production industry. It has superior magnetic permeability than traditional hard magnetic materials, and its power utilization rate is much higher than that of ferromagnetic materials in a wide frequency range, and its volume is smaller. . The application prospects of soft magnetic alloys in aerospace, communications, electric power, electronic technology and other fields are very broad. Soft magnetic alloy raw materials mainly include Mn-Zn series, Ni-Zn series, Cu-Zn series, etc., which are mostly used in transformers, coils, antennas, magnetic heads, switches, etc. In addition, amorphous alloys and alloy films can also be made into soft magnetic materials. With...

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Problems solved by technology

[0006] ①Mechanical alloying method: Prepare nano-powder through mechanical alloying technology (MA), and then solidify the powder through common solidification forming technology (such as static high-pressure forming method, dynamic high-pressure forming method, plasma sintering) to obtain bulk non- Crystalline materials or nanomaterials, this method is prone to impurities, pollution, oxidation and stress during the grinding process, and it is not easy to obtain a clean nano-material interface;

[0007] ②Quick cooling method: The rapid solidification of the melt is achieved through the rapid cooling and rapid solidification technology, and a thin strip is produced, which is wound into a block. This method has relatively large limitations in application. There are gaps between the layers of the block and the strength is not high. , it is difficult to wind complex shapes;

[0008] ③Deep supercooling method: By adjusting the factors affecting the supercooling degree, etc., the soft magnetic alloy raw materials are melted and highly purified to avoid or remove heterogeneous crystal nuclei, and then the molten metal is rapidly solidified under a large thermodynamic supercooling degree. The problem of the method is that the adaptability of the flux is poor, the test results are scattered, and the stability of the purification effect is poor;

[0012] ⑦Large plastic deformation method: Under low temperature conditions, the metal material undergoes large plastic deformation under the action of large stress to obtain bulk nano-soft magnetic particles with large-angle grain boundary ultrafine particles. This method is not easy to obtain isotropic blocks Nanomaterials and materials with poor plasticity

[0013] The outstanding shortcomings of the above methods are: the spatial shape is limited by the process, and the change is inflexible; the environment is harsh, and the energy consumption is high; such as high pressure, low temperature, and large electric field heating; there are restrictions on the composition of the product

However, the sintered powder is not in the nanometer scale, without the influence of the nano effect, and does not generate bulk nano soft magnetic materials

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