Spherical iron-based amorphous alloy powder and preparation method and application in preparation of amorphous magnetic powder core

An iron-based amorphous alloy and magnetic powder core technology, which is applied in the direction of magnetic materials, magnetic objects, and inorganic materials, can solve the problems of poor DC bias resistance, uneven powder composition, and high loss of magnetic powder cores, and achieve reduction Iron core loss, uniform particle size, beneficial to the effect of insulation coating

Inactive Publication Date: 2018-06-15
嘉兴长维新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the magnetic powders used in the amorphous magnetic powder cores involved in the above articles and patents are all prepared by the strip crushing method, and impurities are easily introduced in the process of ball milling and crushing, resulting in uneven powder components. At the same time, the obtained Most of the powders are angular flakes, which are difficult to insulate, resulting in high loss of the magnetic powder core and poor resistance to DC bias

Method used

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  • Spherical iron-based amorphous alloy powder and preparation method and application in preparation of amorphous magnetic powder core
  • Spherical iron-based amorphous alloy powder and preparation method and application in preparation of amorphous magnetic powder core
  • Spherical iron-based amorphous alloy powder and preparation method and application in preparation of amorphous magnetic powder core

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Embodiment 1

[0039] Heat and melt the master alloy to 200°C above the melting point in the atmosphere and keep it warm for 10 minutes, and prepare Fe by gas atomization method 76 Si 9 B 10 P 5 Alloy powder, the gas atomization pressure is 10MPa, the nozzle diameter is 1mm, the powder is sieved with a 200 mesh screen to obtain the target powder, and the morphology of the target powder is analyzed with a scanning electron microscope (SEM), such as figure 1 As shown, it can be seen that the powder presents a spherical shape, with a smooth surface, without defects such as obvious holes and holes; the structure is detected by X-ray diffractometer (XRD), and the results are as follows: figure 2 As shown, it can be seen that there is no diffraction peak corresponding to any crystal on the XRD pattern, only a broad diffuse scattering peak, indicating that the prepared powder is completely amorphous.

[0040] Carry out passivation and insulation coating treatment to the amorphous powder, add th...

Embodiment 2～5

[0044] The preparation process of the spherical iron-based amorphous alloy powder and the amorphous magnetic powder core is the same as that of Example 1, the only difference being that the gas atomization process for preparing the spherical iron-based amorphous alloy powder is carried out under different oxygen partial pressures. Image 6 Provided respectively embodiment 2 (oxygen partial pressure is 3 * 10 4 Pa), embodiment 3 (oxygen partial pressure is 5 * 10 4 Pa), embodiment 4 (oxygen partial pressure is 7 * 10 4 Pa) and embodiment 5 (oxygen partial pressure is 9 * 10 4 Pa) The XRD spectrum of the -200 mesh powder prepared respectively, as shown in the figure, when the oxygen partial pressure is low (embodiment 2), the powder prepared has obvious crystallization, and along with the raising of oxygen partial pressure ( Examples 3-5), a completely amorphous -200 mesh spherical powder can be obtained.

Embodiment 6

[0046] Heat and melt the master alloy to 150°C above the melting point and keep it warm for 15 minutes, and prepare Fe by gas atomization method 76 Si 9 B 10 P 5 Alloy powder, the gas atomization pressure is 9MPa, the nozzle diameter is 1mm, the powder is screened with a 100-mesh screen to obtain the target powder, the SEM map shows that the powder is spherical, the surface is smooth, and there are no obvious holes, holes and other defects ; The XRD pattern shows that the prepared powder is completely amorphous.

[0047] Carry out passivation and insulation coating treatment to the amorphous powder, add the amorphous powder into the phosphating solution (the quality of the phosphating solution is 2% of the mass of the amorphous powder), stir evenly until dry, and obtain the passivated powder, Then the powder after passivation is added in the mixed solution of mica and epoxy resin / acetone solution (in terms of powder mass after passivation, the quality of adding mica is 2%, ...

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Abstract

The invention discloses a preparation method of a spherical iron-based amorphous alloy powder; the spherical iron-based amorphous alloy powder is prepared by a gas atomization method, and the iron-based amorphous alloy with large amorphous forming capacity is used as a raw material; the atomic percentage composition of the iron-based amorphous alloy with large amorphous forming capacity is Fe<100-a-b-c-d-e>SiBP<c>Nb<d>Cu<e>, wherein a is 7-10, b is 7-11, c is 3-6, d is 0-3, and e is 0-2. The invention provides a method for preparing the spherical iron-based amorphous alloy powder by thegas atomization method to obtain the spherical alloy powder with a regular appearance, uniform particle size and complete amorphous state. The amorphous magnetic powder core prepared by taking the spherical iron-based amorphous alloy powder as the raw material has the advantages of uniform structure, high strength, high density and constant magnetic conductivity.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and in particular relates to a spherical iron-based amorphous alloy powder, a preparation method thereof and an application in preparing an amorphous magnetic powder core. Background technique [0002] Iron-based amorphous soft magnetic alloy has the advantages of high saturation magnetic induction, high initial permeability, small coercive force, and low loss. The iron core made of amorphous strip prepared by rapid quenching method is properly heat treated It has excellent soft magnetic properties and has been widely used in various transformers, sensors, switching power supplies and other fields. However, with the development of the electronic power industry, electronic devices are developing in the direction of miniaturization, high frequency and high current, and the soft magnetic core with tape winding and lamination has a large loss when working at high frequency, which limits its use at h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/153H01F1/20C22C45/02B22F1/00B22F9/08
CPCB22F1/0003B22F9/082C22C45/02H01F1/15308H01F1/15366H01F1/15383
Inventor 潘登王新敏常春涛
Owner 嘉兴长维新材料科技有限公司
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