Method for preparing high-saturation flux density soft magnetic composite material based on acidic bluing technique

A soft magnetic composite material, magnetic flux density technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve problems such as magnetic dilution, magnetic powder core magnetic permeability and magnetic flux density reduction.

Active Publication Date: 2015-03-25
ZHEJIANG UNIV
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Problems solved by technology

In the above methods, the insulating coating layer formed on the surface is a non-magnetic layer, which will cause magnetic di

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  • Method for preparing high-saturation flux density soft magnetic composite material based on acidic bluing technique

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preparation example Construction

[0015] The steps of the soft magnetic composite material preparation method are as follows:

[0016] 1) Insulation coating of magnetic powder: take H 3 PO 4 , Ca(NO 3 ) 2 , MnO 2 Soluble in H 2 O is configured as an acidic roasting blue solution, and H is controlled 3 PO 4 , Ca(NO 3 ) 2 , MnO 2 The concentrations are 0.003~0.02 g / ml, 0.06~0.15 g / ml, 0.01~0.02 g / ml, heat and boil the prepared acidic bluing liquid, add magnetic powder, and ensure that the concentration of magnetic powder is less than 0.75 g / ml, Continue heating and keep boiling for 10-40 minutes, so that the surface of the magnetic powder is covered with an insulating layer, then filtered and dried to obtain soft magnetic alloy powder;

[0017] 2) Add binder: pour 0.5% - 2% binder of magnetic powder into the coated soft magnetic alloy powder, heat and stir until the mixture is dry and evenly mixed;

[0018] 3) Compression molding: Add the above alloy powder to zinc stearate with a mass percentage of 0...

Embodiment 1

[0022] 1 g H 3 PO 4 , 10 g Ca(NO 3 ) 2 and 1.5 g MnO 2 Dissolve in 100 ml H 2 O, stir evenly, heat to boiling, then add 60g Fe powder, continue heating to keep the solution boiling for 30 min, then filter, wash 3 times with absolute ethanol repeatedly, at 80 o Stir under C condition until the obtained iron powder is dry.

[0023] The iron powder obtained is added in the ethylene glycol solution of 2wt% silicone resin and 10wt%, at 80 o Stir under the condition of C until the powder is dry, then add 0.25wt% zinc stearate and 0.25wt% barium stearate, press into a dense ring under the condition of 800 MPa, for the ring sample at 450 o C conditions for annealing 1 h, made of soft magnetic composites.

[0024] After testing, the saturation magnetic flux density of the soft magnetic alloy is 1.65 T, and the magnetic permeability is 65. figure 1 It is the hysteresis loop of iron powder (without adding binder and pressing molding) prepared by acid blueing process and tradition...

Embodiment 2

[0027] 0.3 g H 3 PO 4 , 15 g Ca(NO 3 ) 2 and 2 g MnO 2 Dissolve in 100 ml H 2 O, stir evenly, heat to boiling, then add 75 g of FeSiAl powder, continue heating to keep the solution boiling for 10 min, then filter, wash with absolute ethanol three times repeatedly, at 80 o Stir under C condition until the obtained iron powder is dry.

[0028] The iron powder obtained is added in the acetone solution of 0.5wt% epoxy resin and 10wt%, at 80 o Stir under the condition of C until the powder is dry, then add 0.25wt% zinc stearate and 0.25wt% barium stearate, press into a dense ring under the condition of 2000 MPa, for the ring sample at 700 o C conditions annealed 2 h, made of soft magnetic composites.

[0029] After testing, the saturation magnetic flux density of the soft magnetic alloy is 1.3 T, and the magnetic permeability is 110.

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Abstract

The invention discloses a method for preparing a high-saturation flux density soft magnetic composite material based on the acidic bluing technique. According to the method, the surface of soft magnetic alloy powder is coated with a coating layer formed by nanometer Fe3O4 uniform in size based on the acidic bluing technique, and then the novel soft magnetic composite material is obtained through bonding, compression molding and heat processing. The method has the advantages that the Fe3O4 preparing method based on the acidic bluing technique is simple, the thickness of the Fe3O4 layer is easy to control, and due to the adoption of in-situ reaction, a prepared insulating layer is dense and can be better combined with magnetic powder. Compared with a traditional soft magnetic composite material, the high-saturation flux density soft magnetic composite material has the advantage that due to the fact that the insulating layer is made from ferromagnetic Fe3O4, magnetic dilution is effectively reduced, and then the soft magnetic composite material high in saturation flux density and magnetic conductivity can be obtained.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a method for preparing soft magnetic composite materials by using an acid bluing process. Background technique [0002] Soft magnetic composite materials have been widely used in the field of electronics and electrical engineering because of their high saturation magnetic flux density, high magnetic permeability, low coercive force and low loss. The production of soft magnetic composite materials has a long history, but the real industrialization began in the 1980s. With the rapid development and wide application of inverter technology, along with the demand for EMC, soft magnetic composite materials have been widely used ; Entering the 21st century, with the high frequency and high power density of the inverter circuit and the higher requirements of EMC, coupled with the further deepening of people's understanding of soft magnetic composite materials, the industrialization of s...

Claims

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Application Information

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IPC IPC(8): H01F1/147H01F1/24B22F1/02
Inventor 严密赵国梁吴琛
Owner ZHEJIANG UNIV
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