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Tape-casting temperature isostatic pressing composite molding preparation method of metal soft magnetic composite material

A composite material and warm isostatic pressing technology, which is applied in the fields of magnetism of inorganic materials, manufacturing of inductors/transformers/magnets, electrical components, etc., can solve the problems of non-dense green body structure, low molding density, and affecting the performance of functional materials, etc., to achieve The effect of high density uniformity, low porosity and smooth surface

Inactive Publication Date: 2014-09-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the drying process of the casting green body, due to the volatilization of the solvent, many pits and holes will be generated on the surface and inside of the green body, so that the structure of the green body is not dense, and the molding density is low, which in turn affects many properties of functional materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]1) Phosphoric acid and acetone are made into a passivation solution with a mass fraction of 0.6%, and the reduced iron powder with an average particle size of 150 μm and the passivation solution are passivated according to a mass ratio of 1:0.01, and stirred in a mixer 0.5h, put into an oven for passivation, the passivation temperature is 70°C, the passivation time is 1h, and passivation powder is obtained. Add a mixed solvent to the passivation powder, the solvent is trichlorethylene and ethanol mixed at a ratio of 1:1, and the dispersant triolein is added, the above raw materials are mixed, stirred for 30 hours, and then the binder epoxy resin is added to increase the The plasticizer is glycerin and dioctyl phthalate, the binder is 20% by mass of the slurry, and the mass ratio of the binder to the plasticizer is 0.5. Stir the slurry for another 36 hours, disperse it with ultrasound for 5 minutes, filter it through a sieve, and vacuum degas it to obtain a uniformly disp...

Embodiment 2

[0046] 1) Phosphoric acid and ethanol are made into a passivation solution with a mass fraction of 0.8%, and the iron-nickel alloy powder with an average particle size of 0.1 μm and the passivation solution are passivated according to a mass ratio of 1:0.08. Stir for 0.1h, put into an oven for passivation, the passivation temperature is 100°C, and the passivation time is 0.1h to obtain passivation powder. Add a mixed solvent to the passivation powder, the solvent is methyl ethyl ketone and ethanol mixed at 1:10, and the dispersant herring oil is added, the above raw materials are mixed, stirred for 20 hours, and then the binder epoxy resin, plasticizer polyethylene Diol, the binder is 10% by mass of the slurry, and the mass ratio of the binder to the plasticizer is 0.8. Stir the slurry for another 30 hours, disperse it with ultrasound for 3 minutes, filter it through a sieve, and vacuum degas it to obtain a uniformly dispersed slurry. The solvent volume fraction in this slurry...

Embodiment 3

[0052] 1) Phosphoric acid and acetone are made into a passivation solution with a mass fraction of 0.1%, and the passivation is carried out by taking the iron-silicon-aluminum alloy powder with an average particle size of 150 μm and the passivation solution at a ratio of 1:0.1 by mass. Stir for 0.5h, put into an oven for passivation, the passivation temperature is 40°C, and the passivation time is 4h, to obtain passivation powder. Add a mixed solvent to the passivation powder, the solvent is trichlorethylene and methyl ethyl ketone mixed at 10:1, and the dispersant triethanolamine is added, the above raw materials are mixed, stirred for 36 hours, and then W-6C magnetic powder glue, plasticizer glycerin, The binder is 20% by mass of the slurry, and the binder / plasticizer mass ratio is 1.0. Stir the slurry for another 40 hours, disperse it with ultrasound for 15 minutes, filter it through a sieve, and vacuum degas it to obtain a uniformly dispersed slurry. The solvent volume fra...

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Abstract

The invention discloses a tapecasting temperature isostatic pressing composite molding preparation method of a metal soft magnetic composite material. The method comprises the following steps: (1) mixing a passivator and a solvent to obtain a passivating solution, and mixing, stirring and drying the passivating solution and magnetic metal powder to obtain passivated powder; (2) mixing the passivated powder, an organic solvent, a dispersing agent, an adhesive and a plasticizer according to a certain proportion, uniformly stirring, and filtering and de-foaming the mixture through a sieve to prepare slurry which is uniformly dispersed; (3) performing tape casting; (4) performing temperature isostatic pressing on a biscuit. According to the invention, solidification and isostatic pressing processes are simplified into a process, so that a metal soft magnetic composite film prepared by using the blade casting temperature isostatic composite molding method is high in resistivity and good in mechanical strength, and the density and the saturation flux density are greatly improved. By virtue of a more mature tape casting process and a temperature isostatic pressing process, the production process of the metal soft magnetic composite material is simplified, the cost is reduced, the performance is excellent, and the method has a wide application prospect in preparation of electronic devices such as film inductors.

Description

technical field [0001] The invention relates to a method for preparing metal soft magnetic composite materials by casting thermoisostatic pressing composite molding, and belongs to the field of new materials and new technologies for electronic components. Background technique [0002] The main feature of the metal soft magnetic composite material is that the magnetic metal powder is covered by an insulating medium, the resistivity is higher than that of the traditional metal soft magnetic material, the saturation magnetic flux density is higher than that of the ferrite soft magnetic material, and the application frequency is wider. In the field of power electronics, magnetic powder cores made of metal soft magnetic composite materials are widely used to make electronic components such as transformers, filters, and transformers. Under the trend of miniaturization of electronic devices, the traditional soft magnetic ferrite thin film device materials have been unable to meet t...

Claims

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Application Information

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IPC IPC(8): H01F1/16H01F41/02
Inventor 吴琛白国华严密
Owner ZHEJIANG UNIV
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