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Coating method iron-based magnetically soft alloy powder and preparation method of soft magnet composite material

A soft magnetic alloy and powder technology is applied in the field of coating powder to prepare soft magnetic composite materials, and the field of powder coating of iron-based alloy soft magnetic composite materials, which can solve the problems of limited powder quantity, complicated process and low production efficiency, etc. Achieve good magnetic properties and frequency stability, improve compactness and high resistivity

Active Publication Date: 2015-12-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent WO1997030810 directly adopts the method of soaking metal magnetic powder in phosphoric acid solution to achieve coating. The insulating layer covered by this method is uniform and the thickness is easy to control. However, the heat-resistant temperature of the magnet is not high. When the heat treatment exceeds 550 ° C, the phosphating layer is easily damaged. loss of insulation
However, Chinese patents 201310351622.4 and 201310096126.9 use the sol-gel method to achieve Al 2 o 3 The coating of Fe powder with soft magnetic ferrite, the process of preparing sol-gel is relatively complicated, time-consuming and low in production efficiency
In addition, Chinese patent 201310522883.8 uses microwave-assisted treatment to obtain soft ferrite-coated metal magnetic powder. The uniformity of the insulating layer coated by this method is not high, and it is limited by the particle size of ferrite; due to the limited production efficiency of microwave high-temperature equipment Restrictions, so the amount of powder processed in each batch is limited, which is not conducive to large-scale production
However, the Chinese patent 201010621271.0 uses the discharge plasma method to realize the preparation of soft magnetic ferrite and amorphous soft magnetic composite materials. Although it realizes coating and densification in one step, its process conditions and equipment are very demanding. Currently, only It can be realized in the laboratory, and expensive equipment cannot realize batch and large-scale production

Method used

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  • Coating method iron-based magnetically soft alloy powder and preparation method of soft magnet composite material
  • Coating method iron-based magnetically soft alloy powder and preparation method of soft magnet composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Take 100 grams of Fe-9Si-6Al alloy powder with an average particle size of 41 μm, keep it in a muffle furnace at 800 ° C for 20 minutes, and cool with the furnace; put the cooled powder into a beaker filled with 40 ml of hydrochloric acid with a concentration of 1 mol / L , and stirred with a glass rod for 20mim to clean the powder surface; then washed several times with deionized water until the pH was about 6-7; dried the cleaned powder at 120°C for 120min; then put the powder in a hydrogen furnace Keep the temperature at 1000°C for 60 minutes, and cool down with the furnace to get the desired coating powder. Add 0.4% silane coupling agent to the coated powder and mix evenly, then add 1% silicone resin and mix evenly; put the mixed material in a drying oven at 120°C for 120 minutes; disintegrate the cooled material 100-mesh sieve; add 0.3% zinc stearate lubricant to the obtained under-sieve powder and mix evenly; then press 1000MPa to form a ring, and the size of the ri...

Embodiment 2

[0048] Take 100 grams of Fe-3.5Si alloy powder with an average particle size of 32 μm, heat it in a muffle furnace at 900 ° C for 30 minutes, and cool with the furnace; in a beaker, and stirred with a glass rod for 30 minutes to clean the powder surface; then washed several times with deionized water until the pH was about 6-7; dried the cleaned powder at 150°C for 100 minutes; then put the powder in Heat it at 900°C for 60 minutes in a hydrogen furnace, and get the desired coating powder after cooling; add 0.5% silane coupling agent to the coating powder and mix evenly, then add 0.8% silicone resin and mix evenly; mix well Put the material into a drying oven at 150°C for 90 minutes; disintegrate the cooled material and pass it through a 100-mesh sieve; add 0.4% lithium stearate lubricant to the obtained powder and mix evenly; then press 900MPa to form an outer diameter of 20 × inner diameter 12 × height 5 rings. The obtained sample was heat-treated at 750°C in a sintering fu...

Embodiment 3

[0053] Take 200 grams of Fe-6.5Si alloy powder with an average particle size of 36 μm, keep it in a muffle furnace at 900 ° C for 30 minutes, and cool with the furnace; put the cooled powder into a beaker with 100 ml of 3 mol / L hydrochloric acid, Stir with a glass rod for 40 minutes to clean the powder surface; then wash it several times with deionized water until the pH is about 6-7; dry the cleaned powder at 140°C for 90 minutes; then put the powder under argon protection Heat treatment at 900°C for 30 minutes in a heat treatment furnace, and the desired coated powder can be obtained after cooling. Add 0.7% silane coupling agent to the coating powder and mix evenly, then add 0.4% silicone resin and mix evenly; put the mixed material in a drying oven at 130°C for 90 minutes; disintegrate the cooled material 60 mesh sieve; the obtained powder is added with 0.3% content of zinc stearate lubricant and mixed evenly; then pressed into an outer diameter 20 × inner diameter 12 × hei...

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Abstract

The invention relates to a coating method for iron-based magnetically soft alloy powder and a preparation method of soft magnet composite material. The coating method for iron-based magnetically soft alloy powder comprises the following steps: carrying out accelerated oxidation on iron-based magnetic metal powder at high temperature, forming an oxide layer on the surface of the powder and then carrying out acid pickling, thus obtaining powder with surface coated with SiO2, Al2O3 and Cr2O3 oxides. The preparation method of the soft magnet composite material comprises the following steps: adding coupling agent, silicon resin and lubricating agent to the coated powder, carrying out pressing forming, and then carrying out annealing heat treatment, thus obtaining the soft magnet composite material. According to the invention, the advantage that an oxide produced in reaction of elements including Si, Al and Cr contained in the iron-based magnetically soft alloy powder with oxygen is high in electrical resistivity, small in thermal expansion coefficient and steady in chemical performance and can resist high temperature is fully utilized; the adopted coating technology is to produce a coating layer in situ on the surface of the alloy magnetic powder, and is simple in process, easy to operate and low in cost; the metal soft magnet composite material prepared by adopting the method disclosed by the invention has good magnetic property and frequency stability.

Description

technical field [0001] The invention discloses a method for coating iron-based soft magnetic alloy powder and a method for preparing a soft magnetic composite material, in particular to a method for coating powder for an iron-based alloy soft magnetic composite material containing Si, Al and Cr, and using The method for preparing soft magnetic composite materials from coated powder belongs to the technical field of metal powder metallurgy and magnetic material preparation. technical background [0002] Fe-based soft magnetic composite materials have high magnetic permeability, low eddy current loss and total loss, and are widely used in telecommunications as the core part of reactors, transformers, inductors, filters, frequency modulation choke coils and switching power supplies In technologies such as , radar, television, and power supply, its operating frequency can range from tens of Hz to megahertz. The insulation coating of metal magnetic powder is an important process...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F3/16H01F1/147H01F1/20
Inventor 彭元东易健宏李丽娅夏庆林
Owner CENT SOUTH UNIV
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