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Method for coating metal magnetic powder on soft magnetic ferrites and method for preparing soft magnetic composite materials

A technology of metal magnetic powder and soft ferrite, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve problems such as difficulties in the preparation and dispersion of nano-powders, restrictions on large-scale applications, and difficulties in handling chemical liquids. Good coating effect, low cost and easy operation

Active Publication Date: 2015-04-29
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can improve the mechanical properties of magnets, but the disadvantage of SPS technology is that the preparation cost is high and it is difficult to prepare in batches
A common problem of using nano-ferrite powder above is that the preparation and dispersion of nano-powder is difficult, the chemical liquid left after preparation is difficult to handle, and the preparation cost is high, which limits the application of large quantities.

Method used

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  • Method for coating metal magnetic powder on soft magnetic ferrites and method for preparing soft magnetic composite materials
  • Method for coating metal magnetic powder on soft magnetic ferrites and method for preparing soft magnetic composite materials
  • Method for coating metal magnetic powder on soft magnetic ferrites and method for preparing soft magnetic composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 96wt% water-atomized pure Fe powder with an average particle size of 41 μm and 4wt% Ni with a particle size of 1.0 μm used as soft magnetic composite materials 0.5 Zn 0.5 Fe 2 o 4 Mix evenly, and then keep the mixture at 800°C for 30min in an industrial high-temperature microwave oven (2.45GHz, 6kW) under an argon protective atmosphere. Add 0.3% silane coupling agent to the heat-treated mixture and mix evenly, then add 1.0% silicone resin and mix evenly. Put the mixed material into a drying oven at 150°C and dry for 2 hours. After cooling, the material is crushed and passed through a 100-mesh sieve. Add 0.6% KP-11 lubricant to the obtained powder and mix evenly, then press 800MPa to form ф21×ф12×5 rings, and then dry at 150°C for 120min. The obtained sample was heat-treated at 700°C in a sintering furnace with an atmosphere of decomposing ammonia, and kept for 60 minutes. Finally, the magnetic properties of the samples are tested on the BH tester, and the propertie...

Embodiment 2

[0037] 98wt% water-atomized pure Fe powder with an average particle size of 41 μm and 2wt% Ni with a particle size of 1.2 μm used as soft magnetic composite materials 0.5 Zn 0.5 Fe 2 o 4 Mix evenly, and then keep the mixture at 900° C. for 30 min in argon protective atmosphere in a microwave oven. Add 0.4% silane coupling agent to the heat-treated mixture and mix evenly, then add 1.3% silicone resin and mix evenly. Put the mixed material into a drying oven at 150°C and dry for 2 hours. After cooling, the material is crushed and passed through a 100-mesh sieve. Add 0.5% KP-11 lubricant to the obtained powder and mix evenly, then press 1000MPa to form ф21×ф12×5 rings, and then dry at 150°C for 120min. The obtained sample was heat-treated at 800°C in a sintering furnace with an atmosphere of decomposing ammonia, and kept for 60 minutes. Finally, the magnetic properties of the samples are tested on the BH tester, and the properties of the obtained samples are shown in Table 2...

Embodiment 3

[0041] Water-atomized pure Fe powder with an average particle size of 96wt% 41 μm and 4wt% ultrafine Mn with a particle size of 1.1 μm used as soft magnetic composite materials 0.5 Zn 0.5 Fe 2 o 4 Mix evenly, and then keep the mixture at 800° C. for 30 minutes in a microwave oven under an argon protective atmosphere. Add 0.3% silane coupling agent to the heat-treated mixture and mix evenly, then add 1% silicone resin and mix evenly. Put the mixed material into a drying oven at 150°C and dry for 2 hours. After cooling, the material is crushed and passed through a 100-mesh sieve. Add 0.6% KP-11 lubricant to the obtained powder and mix evenly, then press 800MPa to form ф21×ф12×5 rings, and then dry at 150°C for 120min. The obtained sample was heat-treated at 700°C in a sintering furnace with an atmosphere of decomposing ammonia, and kept for 60 minutes. Finally, the magnetic properties of the samples are tested on the BH tester, and the properties of the obtained samples are...

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Abstract

The invention provides a method for coating metal magnetic powder on soft magnetic ferrites. According to the method, the metal magnetic powder is mixed with trace micron or submicron soft magnetic ferrites, and then, a coating layer is formed through microwave high-temperature heat treatment. The invention also discloses a method for preparing the metal soft magnetic composite materials by adopting the coating powder. According to the method, the coating powder is subjected to organic matter coating, lubricating agents are added, pressing and forming are carried out, finally, annealing treatment is carried out, and the soft magnetic composite materials are obtained. The method has the advantages that the characteristics of magnetism, high electrical resistivity and high-temperature resistance of ferrite soft magnetic materials are sufficiently used, the two kinds of soft magnetic materials are compounded, non-magnetic substances are less than other kinds of soft magnetic composite materials, and in addition, a higher heat treatment temperature is realized, so that better magnetic performance is realized. The soft magnetic composite materials prepared by adopting the method provided by the invention have higher magnetic conductivity and low loss, the frequency stability is good, the magnetic loss at high frequency is low, in addition, the preparing process is simple, the environment is protected, the operation is easy, the cost is low, and the method is suitable for industrial mass and large-scale production.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy and magnetic materials, and in particular relates to a method for coating metal magnetic powder with micron or submicron soft ferrite, and a method for preparing soft magnetic composite materials by using the coated powder. Background technique [0002] Soft magnetic material is an important electronic material, which has important applications in power industry, telecommunication engineering and high frequency radio technology. Metal soft magnetic materials have the characteristics of high magnetic induction intensity, but their resistivity is low, and the loss of medium and high frequencies is too large. Ferrite soft magnetic is a non-metallic ferrimagnetic soft magnetic material with high resistivity (such as NiZn ferrite resistivity is 10 7 ~10 10 Ω·m), the saturation magnetization is lower than that of metals, and the price is low. With the miniaturization, high energy and multi-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02H01F1/147H01F1/26
Inventor 彭元东聂军武包崇玺马建张文军
Owner NBTM NEW MATERIALS GRP
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