Heat-treating method and device for nanocrystalline alloy strip

Abstract

The invention discloses a heat-treating method for a nanocrystalline alloy strip. The heat-treating method comprises the following steps of (1), unwinding, tensioning, guiding and winding the nanocrystalline magnetically soft alloy strip along a path at a scheduled unwinding rate; (2), processing the nanocrystalline magnetically soft alloy strip with salt bath heating treatment along a section of the path; (3), carrying out constant temperature heating on the nanocrystalline magnetically soft alloy strip subjected to salt bath heating treatment; and (4), cooling the nanocrystalline magnetically soft alloy strip subjected to constant temperature heating. The invention also discloses a heat-treating device for the nanocrystalline alloy strip. According to the heat-treating method and device, salt bath heating treatment is utilized to conduct two-faced fast heating on the strip, so that surface passivation and crystal nucleus prefabrication heat treatment of the strip are achieved. Due to two-faced fast heating, the heat-treating method and device have the advantages that heat treatment time is controlled conveniently and heat treatment temperature is controlled precisely.

Description

technical field [0001] The invention relates to a heat treatment technology of a nanocrystalline alloy, in particular to a heat treatment method and device for a nanocrystalline alloy strip. Background technique [0002] The nanocrystalline soft magnetic material prepared by the amorphous crystallization method has the advantages of high magnetic induction intensity, low loss, high magnetic permeability, high resistivity, strong corrosion resistance, etc., as well as one-time molding of spray tape, short process flow and low energy consumption. The advantages of advanced production technology, known as the 21st century production and application of double energy-saving green materials. The Fe(Si,B,P,C) Cu system with high saturation magnetic induction that has appeared in recent years has high saturation magnetic induction (Bs), high magnetic permeability (μ), low loss (P) and low magnetostriction coefficient ( λ) and other performance advantages, it is an ideal soft magnet...

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Problems solved by technology

However, this method still uses radiation heat transfer, and the heating and cooling speeds are relatively slow, which cannot meet the requirements of prefabricated crystal nuclei.

[0009] For the heat treatment of prefabricated crystal nuclei in nanocrystalline soft magnetic alloys that require high heating and cooling speeds, high temperature uniformity, high temperature and time control precision, the above equipment can no longer meet the requirements, and the development and operation are more convenient, and the temperature and time control are more precise. It is very necessary to prefabricate the crystal nucleus heat treatment device

[0010] In addition, our research has found that increasing the surface resistivity of the strip wound core plays an important role in further reducing the loss and reducing the performance degradation of the strip due to surface oxidation during heat treatment, but there is currently no effective method and equipment

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