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Preparation method of amorphous or nanocrystalline soft magnetic powder core

A nanocrystalline soft magnetic and magnetic powder core technology, applied in the direction of magnetic materials, magnetic objects, metal processing equipment, etc., can solve the problems of low production efficiency, high mold and process requirements, complex temperature and pressure processes, etc., to eliminate internal stress, The effect of high soft magnetic properties

Active Publication Date: 2017-06-27
BEIJING ZHONG KE SAN HUAN HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the forming of amorphous soft magnetic powder, this conventional warm-pressing process has very limited effect on improving the density of the sample and the corresponding soft magnetic properties.
Moreover, the temperature-pressing process adopted is relatively complicated, with high requirements on molds and processes, and low production efficiency.

Method used

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  • Preparation method of amorphous or nanocrystalline soft magnetic powder core
  • Preparation method of amorphous or nanocrystalline soft magnetic powder core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Step 1: Nanocrystalline soft magnetic powder (molecular formula is Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 ) into a special passivation solution for passivation;

[0050] Step 2: dissolving the epoxy resin in acetone, the mass of the epoxy resin is 1% of the mass of the magnetic powder, and the amount of acetone is based on controlling the concentration of the acetone solution containing the epoxy resin at 7.0-7.5wt%;

[0051] Step 3: Put the nanocrystalline soft magnetic powder into the above epoxy resin solution to form a magnetic powder suspension. The suspension was stirred for 1 hour, put into an oven and baked at 80°C for 1 hour to completely volatilize the solvent, and obtain dry pre-compressed magnetic powder uniformly coated with epoxy resin;

[0052] Step 4: Add 0.2wt% zinc stearate and 1.0wt% mica powder to the above-mentioned pre-compressed magnetic powder, and mix well to obtain a pre-compressed mixed powder;

[0053] Step 5: Fill the mixed powder to be compres...

Embodiment 2

[0060] Step 1: Amorphous soft magnetic powder (molecular formula is Fe 78 Si 16 B 6 ) into a special passivation solution for passivation;

[0061] Step 2: uniformly mix 0.8wt% polyamide-6, 0.2wt% molybdenum disulfide, 0.6wt% mica powder, 0.4wt% kaolin powder and magnetic powder in a high-speed mixer to obtain pre-compressed mixed powder ;

[0062] Step 3: Fill the pre-compressed mixed powder into the mold, apply a pressure of 1200MPa, and obtain a compact after demoulding;

[0063] Step 4: Put the compact into the precision mold of the hot press machine, the radial dimension of the mold cavity is slightly larger than the compact by about 0.05mm, pressurize at 400MPa, temperature 230°C, hold time for 10min for plasticization, and demould after cooling;

[0064] Step 5: Vacuum impregnate the solidified compact with 20wt% sodium silicate solution, control the vacuum degree at about 50Pa, for 1-2min, and perform stabilization treatment in a vacuum oven at 170°C for 30min afte...

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Abstract

The invention provides a preparation method of an amorphous or nanocrystalline soft magnetic powder core. The method includes the following steps that (1) amorphous or nanocrystalline soft magnetic powder is subjected to passivating treatment; (2) passivated amorphous or nanocrystalline soft magnetic powder is subjected to cladding treatment by means of an organic binding agent; (3) then a lubricating agent and an insulating agent is added into magnetic powder obtained in the step (2) to obtain to-be-compressed magnetic powder; (4) the obtained to-be-compressed magnetic powder is subjected to pressing forming at the normal temperature through a mold, and a compressed blank is obtained after demolding is finished; (5) pressure stress is exerted on the obtained compressed blank for solidification or plastification; (6) a compressed blank obtained in the step (5) is impregnated in an inorganic binding agent solution and stabilizing treatment is performed; (7) a compressed blank obtained in the step (6) is subjected to high-temperature annealing heat treatment; (8) an annealed compressed blank framework obtained in the step (7) is impregnated in a high-strength binding agent solution and solidification or stabilizing treatment is performed; and (9) a high-strength blank obtained in the step (8) is subjected to subsequent processing to obtain a finished product. By means of the technical scheme, the amorphous or nanocrystalline soft magnetic powder core with high density and high soft magnetic property can be obtained with low forming pressure.

Description

technical field [0001] The invention belongs to the field of powder metallurgy manufacturing of metal materials, and in particular relates to a method for preparing an amorphous or nanocrystalline soft magnetic powder core. Background technique [0002] Metal magnetic powder core is a soft magnetic functional material with magnetoelectric conversion function, which is made by using powder metallurgy technology, and the metal soft magnetic powder is subjected to surface insulation treatment, mixed with insulating medium and binder, and then pressed. Because the particle size of the magnetic powder is very small, and it is separated by a non-magnetic electrical insulating film, it can isolate the eddy current and is suitable for higher frequencies; due to the gap effect between the particles, the material has low magnetic permeability and constant magnetic permeability; at the same time, due to The particle size is small, and the skin phenomenon basically does not occur, so th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F3/24H01F1/153H01F1/24
CPCH01F1/15333H01F1/1535H01F1/15383B22F3/24B22F2003/248B22F1/07B22F1/10B22F1/102
Inventor 秦国超敖学如蔡道炎饶晓雷胡伯平
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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