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A kind of preparation method of high-resistance sheet-like soft magnetic powder

A technology of soft magnetic powder and high resistance, which is applied in the manufacture of permanent magnets, inductors/transformers/magnets, and circuits. question

Active Publication Date: 2022-02-11
HUNAN NELKIN MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) The diameter-thickness ratio of flake powder is large, the bulk density is small, and the bridging phenomenon is serious during natural accumulation. The surface treatment effect of this type of material is not good, and problems such as incomplete and uneven coating will occur;
[0008] (2) The use of a large number of industrial reagents will increase the cost of powder surface treatment;
[0009] (3) It must be carried out after the powder is made, and it includes wetting, mixing, drying and other processes. The process is complicated and lengthy, and it is not suitable for large-scale production

Method used

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  • A kind of preparation method of high-resistance sheet-like soft magnetic powder
  • A kind of preparation method of high-resistance sheet-like soft magnetic powder
  • A kind of preparation method of high-resistance sheet-like soft magnetic powder

Examples

Experimental program
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Effect test

Embodiment 1

[0040] In this example, the equipment used to prepare high-resistance flake-shaped soft magnetic powder is improved on the basis of the existing tube furnace. The furnace 1-1 of the equipment is made of corundum, and the whole is in the shape of a slender hollow cylinder. , the furnace 1-1 is arranged according to its axial direction parallel to the vertical direction (the direction of the gravity of the object), the bottom of the furnace 1-1 is dense, and the gas nozzle 1-3 is connected to the bottom of the furnace 1-1, Except for the access of the gas nozzle 1-3, the bottom of the furnace 1-1 is a compact structure, and the top of the furnace 1-1 is an open structure that communicates with the outside world, and the flange 1-1 that matches the open structure 4 Cover the top of the furnace 1-1. like figure 1 As shown, along the axial direction of the furnace 1-1, from bottom to top, the reaction area in the furnace 1-1 is divided into the first acceleration area 1-11, the ma...

Embodiment 2

[0051] In this embodiment, the equipment used to prepare high-resistance flake-shaped soft magnetic powder is improved on the basis of the existing tube furnace. The furnace 2-1 of the equipment is made of corundum, and the whole is in the shape of a slender hollow cylinder. , with a hollow cylindrical inner cavity as the reaction area 2-11, the furnace 2-1 is arranged according to its axial direction parallel to the horizontal direction, and both ends of the furnace 2-1 are open structures that communicate with the outside world, respectively with the open Flanges 2-3 matching the mouth structure cover the two ends of the furnace 2-1. like figure 2 As shown, two parallel metal pole plates 2-2 are arranged around the side wall of the furnace 2-1 corresponding to the reaction area 2-11, and the metal pole plates 2-2 are connected to alternating current to generate An alternating magnetic field with uniform spatial distribution and periodic changes in size with time. At the sa...

Embodiment 3

[0060] In this embodiment, the equipment used to prepare high-resistance sheet-shaped soft magnetic powder is improved on the basis of the existing tube furnace. The furnace 3-1 of the equipment is made of corundum, and the whole is in the shape of a slender hollow cylinder. , with a hollow cylindrical inner cavity as the reaction area 3-11, the furnace 3-1 is arranged according to its axial direction parallel to the horizontal direction, and both ends of the furnace 3-1 are open structures that communicate with the outside world. Flanges 3-3 matching the mouth structure cover the two ends of the furnace 3-1. like image 3 As shown, a spiral stirring paddle 3-2 extending into the reaction zone 3-11 is also installed at one end of the furnace 3-1. connect.

[0061] In this embodiment, air is used to provide an oxidizing atmosphere, and a set of treatment groups is set, marked as treatment group III. The specific operations for dealing with Group III are as follows:

[0062]...

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Abstract

The invention provides a preparation method of high-resistance sheet-shaped soft magnetic powder, which includes the following steps: providing an oxidizing atmosphere with a mixed gas including oxygen, and making the sheet-shaped soft magnetic powder at 100°C-250°C in a reaction area filled with the mixed gas Keep warm at ℃ for 10 minutes to 60 minutes to carry out the vapor deposition reaction, thereby forming an oxide film on the surface of the flake soft magnetic powder; during the vapor phase deposition reaction, keep the flake soft magnetic powder in suspension in the reaction area status. The flaky soft magnetic powder kept in a suspended state can fully contact the oxidizing atmosphere in a dispersed state, thereby forming a complete and uniform oxide film on the surface of the flaky soft magnetic powder, and the reaction of the vapor deposition reaction involved Mild conditions, strong controllability, by controlling the heat treatment process and oxygen partial pressure, the thickness of the oxide film can be controlled more accurately, does not involve the use of a large number of reagents, easy to operate, suitable for large-scale production, and has a high environmental friendliness.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and in particular relates to a preparation method of high-resistance flake soft magnetic powder. Background technique [0002] Soft magnetic composite material is a magnetic component with high saturation magnetic induction, high magnetic permeability and low loss, which is made by mixing soft magnetic powder and a small amount of binder. It is widely used in electric power, electronics, communication and energy fields. Common product forms of soft magnetic composite materials include magnetic powder cores and wave-absorbing materials, and materials include iron-based (Fe, Fe-Si, Fe-Si-Al, Fe-Si-Cr, Fe-Ni, Fe-Ni-Mo) crystals state, amorphous and nanocrystalline. Among them, the magnetocrystalline anisotropy constant and the magnetostriction coefficient of the Fe-Si-Al soft magnetic alloy are close to zero, so it has very beneficial comprehensive magnetic properties. The main advantage of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02
CPCH01F41/026
Inventor 林俐
Owner HUNAN NELKIN MATERIAL TECH CO LTD