A method for coating soft magnetic ferrite with metal magnetic powder and a method for preparing soft magnetic composite materials

A technology of soft magnetic composite materials and metal magnetic powders, 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: 2016-09-21
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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  • A method for coating soft magnetic ferrite with metal magnetic powder and a method for preparing soft magnetic composite materials
  • A method for coating soft magnetic ferrite with metal magnetic powder and a method for preparing soft magnetic composite materials
  • A method for coating soft magnetic ferrite with metal magnetic powder and a method for preparing soft magnetic composite materials

Examples

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Effect test

Embodiment 1

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

Embodiment 2

[0037] 98wt% water atomized pure Fe powder with an average particle size of 41μm and 2wt% Ni powder with a particle size of 1.2μm for soft magnetic composites 0.5 Zn 0.5 Fe 2 O 4 Mix well, then the mixture was incubated at 900° C. for 30 min in a microwave oven under an argon atmosphere. Add 0.4% silane coupling agent to the heat-treated mixture to mix evenly, and then add 1.3% silicone resin to mix evenly. Put the mixed material into a drying box and dry at 150°C for 2 hours. After cooling, the material is crushed and passed through a 100-mesh sieve. The obtained powder was mixed with 0.5% KP-11 lubricant, and then pressed into a ф21×ф12×5 ring at a pressure of 1000MPa, and then dried at 150°C for 120min. The obtained samples were heat-treated at 800°C in a sintering furnace in a decomposed ammonia atmosphere for 60 minutes. Finally, the magnetic properties of the samples were tested on a BH tester, and the properties of the obtained samples are shown in Table 2 (B max ...

Embodiment 3

[0041] Water-atomized pure Fe powder with an average particle size of 96wt% 41μm and 4wt% ultrafine Mn with a particle size of 1.1μm used for soft magnetic composites 0.5 Zn 0.5 Fe 2 O 4 Mix well, then the mixture was incubated at 800° C. for 30 min in a microwave oven under an argon atmosphere. Add 0.3% silane coupling agent to the heat-treated mixture to mix evenly, and then add 1% silicone resin to mix evenly. Put the mixed material into a drying box and dry at 150°C for 2 hours. After cooling, the material is crushed and passed through a 100-mesh sieve. The obtained powder was mixed evenly with 0.6% KP-11 lubricant, then pressed into ф21×ф12×5 rings at 800MPa pressure, and then dried at 150°C for 120min. The obtained samples were heat-treated at 700°C in a sintering furnace in a decomposed ammonia atmosphere for 60 minutes. Finally, the magnetic properties of the samples were tested on a BH tester, and the properties of the obtained samples are shown in Table 3 (B ma...

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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 fields of powder metallurgy and magnetic materials, and particularly relates to a method of coating metal magnetic powder with micron or sub-micron soft ferrite, and a method of using this coating powder to prepare soft magnetic composite materials. Background technique [0002] Soft magnetic material is an important electronic material and has important applications in the power industry, telecommunications 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 in mid- and high-frequency is too large. Ferrite soft magnet is a non-metallic ferrimagnetic soft magnetic material with high resistivity (such as NiZn ferrite resistivity 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-function...

Claims

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Application Information

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Patent Type & Authority Patents(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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