Iron-based alloy magnetic powder core adopting core-shell heterostructure and preparation method thereof

An iron-based alloy, heterostructure technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problem of difficult to control the thickness control conditions of the uniform oxide insulating film, and avoid the use of organic insulating agents and binders. Use, reduce production costs and investment, the effect of simple operation

Inactive Publication Date: 2014-10-01
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the uniform oxidation problem of this technology and the thick

Method used

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  • Iron-based alloy magnetic powder core adopting core-shell heterostructure and preparation method thereof
  • Iron-based alloy magnetic powder core adopting core-shell heterostructure and preparation method thereof
  • Iron-based alloy magnetic powder core adopting core-shell heterostructure and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] An iron-based alloy magnetic powder core with a core-shell heterostructure and a preparation method thereof. The preparation method of this embodiment is:

[0031] The first step is to mix 80~85wt% iron-based alloy powder and 15~20wt% SiO 2 The powder is mixed evenly, and then ball milled for 1~1.5h under the protection of argon, the mass ratio of ball to material is (10~12)︰1, the speed of the ball mill is 100~200r / min, and the iron-based Alloy composite powder.

[0032] The second step is to put the iron-based alloy composite powder with a core-shell heterogeneous structure into a graphite mold, then place the graphite mold in a plasma-activated sintering furnace, vacuumize to 0.01-0.05MPa, and inject argon gas to normal pressure; then raise the temperature to 900~950°C at a heating rate of 50~60°C / min, apply pressure to the graphite mold at an equal pressure rate to 20~25MPa, start and end time of heating and pressurization of graphite mold same time.

[0033] St...

Embodiment 2

[0042] An iron-based alloy magnetic powder core with a core-shell heterostructure and a preparation method thereof. The preparation method of this embodiment is:

[0043] The first step is to mix 85~90wt% iron-based alloy powder and 10~15wt% MgO powder evenly, and then ball mill for 1.5~2h under the protection of argon, the mass ratio of ball to material is (12~14)︰1, The speed of the ball mill is 200~300r / min, and the iron-based alloy composite powder with a core-shell heterogeneous structure is obtained.

[0044] The second step is to put the iron-based alloy composite powder with a core-shell heterogeneous structure into a graphite mold, then place the graphite mold in a plasma-activated sintering furnace, vacuumize to 0.05~0.10MPa, and inject argon gas to normal pressure; then raise the temperature to 950~1000℃ at a heating rate of 60~70℃ / min, apply pressure to the graphite mold at an equal pressure rate to 25~30MPa, start and stop time of heating and pressurization of gr...

Embodiment 3

[0054] An iron-based alloy magnetic powder core with a core-shell heterostructure and a preparation method thereof. The preparation method of this embodiment is:

[0055] The first step is to mix 90~95wt% iron-based alloy powder and 5~10wt% Al 2 o 3 The powder is mixed evenly, and then ball milled for 2~2.5h under the protection of argon, the mass ratio of ball to material is (14~16)︰1, the speed of the ball mill is 300~400r / min, and the iron-based Alloy composite powder.

[0056] In the second step, the iron-based alloy composite powder with a core-shell heterogeneous structure is loaded into a graphite mold, and then the graphite mold is placed in a plasma-activated sintering furnace, vacuumed to 0.10-0.15MPa, and nitrogen gas is introduced to Atmospheric pressure; then raise the temperature to 1000~1050℃ at a heating rate of 70~80℃ / min, apply pressure to the graphite mold at an equal pressure rate to 30~35MPa, start and end time of heating and pressurization of graphite ...

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Abstract

The invention relates to an iron-based alloy magnetic powder core adopting a core-shell heterostructure and a preparation method thereof. The technical scheme is as follows: 80-95wt% of iron-based alloy powder and 5-20wt% of inorganic oxide powder are evenly mixed and subjected to ball milling for 1-5 h under the shielding of an inert gas, the ball-milled iron-based alloy composite powder is contained in a graphite die, then the graphite die is placed in a plasma activation sintering furnace to be heated to 900-1250 DEG C, the pressure is exerted on the graphite die to 20-50 MPa, and the temperature is kept for 5-30 min under the shielding of the inert gas; the temperature is reduced to 400-500 DEG C at the temperature reduction rate of 30-50 DEG C/min, and the graphite die is cooled along with the furnace; the pressure exerted on the graphite die is unchanged when the temperature is kept and reduced to 400-500 DEG C, and the pressure is reduced to 0 at a constant speed during cooling; the graphite die is taken out of the furnace, and demolding is performed to obtain the iron-based alloy magnetic powder core adopting the core-shell heterostructure. The preparation method is simple in process, high in preparation efficiency and low in preparation cost; the iron-based alloy magnetic powder core is high in saturation flux density, high in density, good in insulating property, low in eddy-current loss and good in thermal stability.

Description

technical field [0001] The invention belongs to the technical field of iron-based alloy magnetic powder cores. Specifically relates to an iron-based alloy magnetic powder core with a core-shell heterogeneous structure and a preparation method thereof. Background technique [0002] Magnetic powder core is a kind of soft magnetic material formed by mixing and pressing ferromagnetic powder particles and insulating medium, also known as soft magnetic composite material or powder magnetic core. Since the surface of the ferromagnetic powder particles is coated with a layer of insulating dielectric film, the magnetic powder core has high resistivity, so the eddy current loss is low, and it is suitable for higher frequency applications. In addition, the magnetic powder core also has the advantages of high saturation magnetic induction, good frequency characteristics and constant magnetic permeability, which makes the magnetic powder core widely used in communications, energy, autom...

Claims

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Application Information

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IPC IPC(8): H01F1/147H01F1/24B22F1/02B22F3/12
Inventor 樊希安吴朝阳王健李光强甘章华
Owner WUHAN UNIV OF SCI & TECH
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