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Preparation method of soft magnetic composite powder core

A soft magnetic composite, powder core technology, applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc. High saturation magnetic induction, low eddy current loss, and the effect of improving molding density

Inactive Publication Date: 2017-09-15
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: provide a kind of preparation method of soft magnetic composite powder core, is based on amorphous nanocrystalline Fe a Si b m c B d Cu e Powder is the main powder, and the auxiliary powder composed of at least one of water atomized Fe powder, gas atomized FeNi50 powder and gas atomized FeSi3.5 powder is evenly mixed according to the set mass ratio, and the mixed powder is mixed with passivation solution and The insulating agent forms a passivation insulating film on the surface, and then undergoes compression molding and annealing process to obtain a soft magnetic composite powder core with excellent comprehensive soft magnetic properties, which overcomes the low saturation magnetic induction of the soft magnetic powder core produced by the prior art , large coercive force, large loss and reduced effective permeability at high frequencies

Method used

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  • Preparation method of soft magnetic composite powder core
  • Preparation method of soft magnetic composite powder core
  • Preparation method of soft magnetic composite powder core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The first step is to prepare amorphous and nanocrystalline Fe 74.5 Si 13.5 Nb 2.5 B 8.5 Cu 1 Main powder:

[0044] Calculate the element composition formula Fe according to the atomic percentage 74.5 Si 13.5 Nb 2.5 B 8.5 Cu 1 The mass percent of the constituent elements in the element, weigh the required amount of component raw materials according to the calculated mass percent of the element: pure iron, pure silicon, ferro-niobium, ferro-boron and pure copper, wherein the mass fraction of niobium in ferroniobium 66.5%, and the mass fraction of boron in ferroboron is 17.4%, thus completing the preparation of raw materials, smelting the raw materials of the above components evenly and spraying out an amorphous thin strip with a thickness of 30 μm and a width of 10 mm in the atmospheric environment. Thin strip in vacuum -1 In the heat treatment furnace of Pa, the temperature is heated from room temperature to 480°C at a heating rate of 1°C / min, and then heated fr...

Embodiment 2

[0063] In this embodiment, the amorphous nanocrystalline Fe 74.5 Si 13.5 Nb 2.5 B 8.5 Cu 1 The mass fraction of the main powder is changed to 60%, the mass fraction of the gas-atomized FeNi50 powder is changed to 40%, and other processes are the same as in Example 1.

[0064] The soft magnetic properties and mechanical properties of the soft magnetic composite powder core prepared in this example are shown in Table 1.

Embodiment 3

[0066] The first step is to prepare amorphous and nanocrystalline Fe 70 Si 15.5 Nb 2 Mo 1.5 B 10 Cu 1 Main powder:

[0067] Calculate the element composition formula Fe according to the atomic percentage 70 Si 15.5 Nb 2 Mo 1.5 B 10 Cu 1 The mass percentage of the constituent elements in the element, weigh the required amount of component raw materials according to the calculated mass percentage of the element: pure iron, pure silicon, ferro-niobium, ferro-molybdenum, ferro-boron and pure copper, wherein niobium in ferroniobium The mass fraction of boron in ferro-boron is 66.5%, the mass fraction of boron in ferro-molybdenum is 17.4%, and the mass fraction of molybdenum in ferro-molybdenum is 50%, thus completing the preparation of raw materials, smelting the raw materials of the above components evenly and spraying them out in the atmosphere An amorphous thin strip with a thickness of 40 μm and a width of 5 mm, the thin strip is vacuumed -1 In the heat treatment fur...

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Abstract

The invention discloses a preparation method of a soft magnetic composite powder core, and relates to a magnet distinguished by the adopted magnetic materials. Amorphous nanocrystalline FeSiM<c>B<d>Cu<e> powder is taken as the main powder; the main powder and auxiliary powder which is formed by at least one of water atomized Fe powder, gas atomized FeNi<50> powder and gas atomized FeSi<3.5> powder are uniformly mixed based mass ratio; the mixed powder is processed by a passivation solution and an insulating agent to form a passivated and insulated thin film on the surface; and next, steps of pressing and shaping and annealing are performed to prepare the soft magnetic composite powder core with excellent comprehensive soft magnetic performance. By adoption of the preparation method, the defects of low saturation flux induction density, relatively high coercivity, high loss and reduction of effective magnetic conductivity under high frequency of the soft magnetic powder core prepared in the prior art can be overcome.

Description

technical field [0001] The technical scheme of the invention relates to magnets classified according to the magnetic materials used, in particular to a method for preparing a soft magnetic composite powder core. Background technique [0002] With the rapid development of the electronics and electrical industry, new requirements have been put forward for the performance of electrical devices such as switching power supplies. So far, magnetic powder cores with stable effective permeability, low loss and high quality factor have been used at frequencies from 50Hz to 100kHz. Not perfect. In 1988, Yoshizawa et al. (Y.Yoshizawa, S.Oguma, K.Yamauchi. New Fe-based soft magnetic alloys composed of ultrafine grain structure [J]. Journal of AppliedPhysics.1988, 64:6044-6046.) of Hitachi Corporation invented Finemet, an amorphous and nanocrystalline material with excellent soft magnetic properties, has a saturation magnetic induction of 1.2T and an initial permeability of 10 4 ~10 5 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/147C22C45/02B22F1/00
CPCB22F1/0003H01F1/14766H01F41/0246C22C45/02B22F1/145
Inventor 孙继兵杜帅龙李英殷福星张磊
Owner HEBEI UNIV OF TECH
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