An ultramicrocrystalline iron core strong magnetic annealing process and its special equipment

Abstract

The invention relates to a strong magnetic annealing process for an ultracrystalline iron core. The process comprises the following steps of: (1) placing the ultracrystalline iron core in a heat treatment area of a square furnace to make the axial direction of the ultracrystalline iron core upward, gradually raising the internal temperature of the square furnace to 475 DEG C, and uniformly heating the ultracrystalline iron core; (2) pushing the square furnace into a strong magnetic field to make the square furnace in the center of the strong magnetic field; (3) keeping the internal temperature of the square furnace at 475 to 495 DEG C, and taking the square furnace out of the strong magnetic field after 3 to 4 hours; (4) raising the internal temperature of the square furnace which is taken out of the strong magnetic field to 565 DEG C, and keeping the temperature for 2 to 3 hours; and (5) after the step (4) is finished, naturally reducing the internal temperature of the square furnace to room temperature to finish the strong magnetic annealing process for the ultracrystalline iron core. By adoption of the strong magnetic annealing process for the ultracrystalline iron core, residual magnetism and magnetic conductivity are effectively controlled, linearity is improved, the whole process is simple and convenient, cutting of the ultracrystalline iron core is not required, production cost is reduced, and product yield is improved.

Description

technical field [0001] The invention belongs to the field of ultramicrocrystalline materials, in particular to an ultramicrocrystalline iron core strong magnetic annealing process and its special equipment. Background technique [0002] Ferrite, silicon steel sheet, and permalloy, which are commonly used in traditional iron core materials, have their own characteristics, as follows: 1. Ferrite has high resistivity, which suppresses eddy current loss and does not need to be made into thin strips. It can be used at high frequencies, but its disadvantages are: (1) The saturation magnetic induction is too low, which increases the volume of the iron core, and it is easy to be saturated when working under a strong magnetic field; (2) The magnetic permeability is low, resulting in increased excitation power and increased copper loss; (3) Its Curie point is below 200 degrees Celsius, resulting in poor temperature stability and limited working environment. 2. Although the silicon st...

AI Technical Summary

Problems solved by technology

[0002] Ferrite, silicon steel sheet, and permalloy, which are commonly used in traditional iron core materials, have their own characteristics, as follows: 1. Ferrite has high resistivity, which suppresses eddy current loss and does not need to be made into thin strips. It can be used at high frequencies, but its disadvantages are: (1) The saturation magnetic induction is too low, which increases the volume of the iron core, and it is easy to be saturated when working under a strong magnetic field; (2) The magnetic permeability is low, resulting in increased excitation power and increased copper loss; (3) Its Curie point is below 200 degrees Celsius, resulting in poor temperature stability and limited working environment

2. Although the silicon steel sheet has a higher saturation magnetic induction, its significant disadvantages are large iron loss and rapid temperature rise, which are not suitable for use at high frequencies, and the magnetic permeability is low.

3. Although the Permalloy magnetic permeability is high, the linearity of the magnetic permeability is poor, and it will drop a lot at high frequencies. It will increase the ratio difference when used as a precision current transformer, and its saturation magnetic induction is low. Poor DC capability, easy to saturate, high cost

When some applications require a small coercive force and control the remanence ratio (Br / Bs) within a certain range, the traditional processing method is to cut the ring iron core, but this makes the process more complicated. That is to say, it increases the production cost and reduces the qualification rate of the product.

Images