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Power coating method of metal soft magnetic composite and preparing method of metal soft magnetic composite

A technology of metal magnetic powder and composite materials, which is applied in the field of preparation of soft magnetic composite materials and powder coating for metal soft magnetic composite materials. easy-to-use effects

Active Publication Date: 2015-02-25
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this does not guarantee that the nano powder can be firmly combined with the magnetic metal powder.

Method used

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  • Power coating method of metal soft magnetic composite and preparing method of metal soft magnetic composite
  • Power coating method of metal soft magnetic composite and preparing method of metal soft magnetic composite
  • Power coating method of metal soft magnetic composite and preparing method of metal soft magnetic composite

Examples

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Effect test

Embodiment 1

[0039] Put aluminum isopropoxide into deionized water, pass through 85°C water bath and magnetically stir for 40min, then drop HNO 3 And continue magnetic stirring for 10h, the molar ratio of aluminum isopropoxide, deionized water and nitric acid is 1:80:0.4. After the magnetic stirring is completed, continue to stand and age in a water bath at 90°C for 20 hours, and mix the AlOOH sol obtained by filtration with the water-atomized pure Fe powder with an average particle size of 35 μm used as a soft magnetic composite material, and the weight of the sol is water 2% of pure Fe powder was atomized, and then the mixture was kept in a drying oven at 150 °C for 120 min to obtain AlOOH gel-coated powder. The resulting powder was then subjected to H2 Heating to 1120°C in atmosphere for 60min. That is to get nano-Al 2 o 3 Coated magnetic powder. Then, 0.5% of the total mass of the silane coupling agent was added to the heat-treated mixture for uniform mixing, and 1% of the total ma...

Embodiment 2

[0044] Put aluminum isopropoxide into deionized water, pass through 80°C water bath and magnetically stir for 50min, then drop HNO 3 And continue the magnetic stirring for 15 hours, the molar ratio of aluminum isopropoxide, deionized water and nitric acid is 1:100:0.5. After the magnetic stirring is completed, continue to stand and age in a water bath at 95°C for 25h, and mix the AlOOH sol obtained by filtration with the water atomized Fe-3.5Si powder with an average particle size of 30μm used as a soft magnetic composite material, and the weight of the sol is It is 1% of water atomized Fe-3.5Si powder, and then the mixture is kept in a drying oven at 150°C for 120min to obtain AlOOH gel-coated powder. The obtained powder was heated to 1140°C in an atmosphere of decomposed ammonia for 60 minutes. That is to get nano-Al 2 o 3 Coated magnetic powder. Then, 0.6% of the total mass of the silane coupling agent was added to the heat-treated mixture and mixed evenly, and 1.1% of ...

Embodiment 3

[0049] Put aluminum isopropoxide into deionized water, pass through a 90°C water bath and magnetically stir for 30 minutes, then drop in HNO 3 And continue magnetic stirring for 12 hours, the molar ratio of aluminum isopropoxide, deionized water and nitric acid is 1:90:0.4. After the magnetic stirring is completed, continue to stand and age in a water bath at 95°C for 30 hours, and mix the AlOOH sol obtained by filtration with the water atomized Fe-6.5Si powder with an average particle size of 32 μm used as a soft magnetic composite material, and the weight of the sol It is 3% of water atomized Fe-6.5Si powder, and then the mixture is kept in a drying oven at 120°C for 150min to obtain AlOOH gel-coated powder. The resulting powder was subjected to H 2 Heated to 1150°C in atmosphere for 60min. That is to get nano-Al 2 o 3 Coated magnetic powder. Then add silane coupling agent accounting for 0.5% of the total mass to the heat-treated mixture and mix evenly, and add 1.2% sil...

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Abstract

A powder coating method of metal soft magnetic composite is characterized in that aluminum isopropoxide is used as precursor to produce a nano Al2O3 coating by means of sol-gel and high-temperature thermal treatment, metal powder is then coated with silane coupling agent and silicon resin, and coated organic matter is dried to obtain coating powder. The invention further discloses a method for preparing the metal soft magnetic composite by using the coating powder; the method includes: crushing and screening the coating powder, adding a moderate amount of lubricant, performing pressing, and annealing compacts to obtain the required soft magnetic composite. The soft magnetic composite is evenly and compactly coated with nano Al2O3, and high-temperature thermal treatment helps improve formability of magnetic powder. The prepared soft magnetic composite has high magnetic conductivity, lower loss and stable frequency; decay in magnetic conductivity is small with increase in the frequency; the magnetic loss is lower under high frequency; preparation equipment is simple, easy to operate, low in cost and especially suitable for industrial batch production.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy and magnetic materials, and in particular relates to a powder coating method for metal soft magnetic composite materials and a method for preparing soft magnetic composite materials by using the coated powder. Background technique [0002] Soft magnetic composite material is an important electronic material, which has important applications in power industry, telecommunication engineering and high frequency radio technology. Early soft magnetic composite materials were prepared by coating metal magnetic powder with organic matter, and then by compression molding and heat treatment. For example, US Patent No. 874908 reports the use of iron-resin composites to make soft magnetic materials. In addition, U.S. 3,935,340 to Yamaguchi employs a thermoplastic covering. When using an organic coating layer, the heat treatment temperature is limited to below 500°C, so the magnetic performance of ...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F3/02H01F1/20H01F41/02
Inventor 彭元东马建聂军武包崇玺
Owner NBTM NEW MATERIALS GRP
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