Method for precisely preparing nanocrystalline magnetic core with high magnetic permeability

Abstract

The invention provides a method for precisely preparing a nanocrystalline magnetic core with high magnetic permeability. The method comprises a step of nanocrystalline magnetic core curing and a step of nanocrystalline magnetic core cutting, wherein nanocrystalline magnetic core curing is realized by taking epoxy resin as varnish gum in a vacuum impregnation manner, particularly, a magnetic core and the varnish gum are preheated to 60-70 DEG C before impregnation, the epoxy resin varnish gum is mixed with acetone, then diluted and kept at the temperature for impregnation, the cured magnetic core has a clean and smooth surface, and the varnish gum can be kept in the magnetic core and doesn't overflow; the step of magnetic core cutting is implemented as follows: a grinding wheel machine cutting mechanism is adopted for cutting, meanwhile, a PLC (programmable logic controller) control system is adopted for controlling working feed, a self-made chemical corrosive agent is adopted for protecting a cutting site, and a tidy and smooth cutting surface of the magnetic core is guaranteed. The nanocrystalline magnetic core prepared with the method has the excellent characteristic that the magnetic permeability of the nanocrystalline magnetic core is 10 times higher than that of a conventional magnetic core and the nanocrystalline magnetic core has good temperature resistance and toughness.

Description

technical field [0001] The invention relates to a preparation method for processing and cutting a nanocrystalline magnetic core, in particular to a preparation method capable of improving the magnetic permeability of the magnetic core. Background technique [0002] In recent years, amorphous magnetic cores are popular for their high saturation magnetic induction, low high-frequency loss rate and excellent frequency characteristics. In many fields, amorphous magnetic cores have begun to replace traditional inductive material cores, such as iron oxide and magnetic powder cores. At present, the preparation steps of amorphous magnetic cores include solidifying the amorphous alloy and then cutting. The actual production process still follows the traditional method of preparing iron cores to prepare amorphous and nanocrystalline magnetic cores. The magnetic permeability of the magnetic cores produced in this way is Very low, and the temperature performance is very poor, can not m...

AI Technical Summary

Problems solved by technology

However, the commonly used curing agent for epoxy resin is low-molecular-weight polyamide. The low-molecular-weight polyamide has a relatively high viscosity, poor fluidity and poor permeability during the impregnation process, and will affect amorphous, nano Crystalline strips produce a lot of stress, and because of the sensitivity of amorphous and nanocrystalline strips to stress, studies have shown that as the viscosity of the curing agent increases, the loss change rate of the amorphous iron core and nanocrystalline iron core increases. The rate of change of magnetic permeability increases

Therefore, low-molecular polyamide is used as the curing agent, and the stress generated during the curing process will reduce the magnetic properties of the cured iron core.

[0005] The traditional method of cutting the magnetic core is to use silicon steel sheets to cut, and the cutting surface of the magnetic core will produce air gaps and burrs, which will lead to low magnetic permeability and poor temperature characteristics of the magnetic core, which cannot meet the accuracy level and temperature of transformers, sensors and other devices. Features and Miniaturization Requirements

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