A kind of iron-based soft magnetic composite powder and its preparation method

Abstract

The present application discloses an iron-based soft magnetic composite powder, characterized in that the iron-based soft magnetic composite powder comprises an iron-based soft magnetic powder and aluminum powder; the iron-based soft magnetic powder is loaded on the aluminum powder; it is possible to still have a high magnetic permeability for the composite material while reducing the addition amount of the iron-based soft magnetic powder, thereby reducing the weight of the entire composite material and broadening the application scope of the composite material.

Description

Technical Field

[0001] The present application relates to an iron-based soft magnetic composite powder and a preparation method thereof, belonging to the field of alloys. Background Art

[0002] Soft magnetic materials have emerged as early as the 19th century. Soft magnetic materials are easy to magnetize and demagnetize, so they have characteristics such as high magnetic permeability and low coercive force, and play a very important role in various electronic devices. Iron-based soft magnetic is a relatively common soft magnetic powder, which has characteristics such as good saturation magnetic induction intensity, magnetic permeability, and low power loss. It is widely used in fields such as communication, aerospace, and radar, and is an important material for manufacturing key components such as various power switches and inductors. However, for general iron-based soft magnetic powders, their own characteristics cannot fully meet the applications in the fields that require high saturation magnetic induction intensity. In addition, when iron-based soft magnetic is used as an inorganic filler, in order to achieve good magnetic permeability, a large amount of it is always added when preparing a composite material with a substrate, and only then can the composite material have high magnetic permeability. This will directly lead to an increase in the weight of the entire composite material and also increase the preparation difficulty. In order to improve the magnetic permeability of iron-based soft magnetic powders, some researchers currently improve the magnetic permeability of iron-based soft magnetic powders by changing the preparation method of iron-based soft magnetic powders or by introducing rare earth elements. CN106067359A discloses a preparation method of an iron-silicon-boron composite soft magnetic alloy, and CN101847483A discloses an iron-silicon-boron soft magnetic alloy modified by rare earth elements. Although the above patents can improve the magnetic permeability of iron-based soft magnetic powder to a certain extent, they do not solve the problem of the increase in the weight of the composite material caused by it. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides an iron-based soft magnetic composite powder and a preparation method thereof, characterized in that aluminum powder is used as a carrier, and the iron-based soft magnetic powder is loaded onto the aluminum powder. Aluminum powder can not only improve the performance of the soft magnetic material, but also has good ductility and is easy to process. In addition, the iron-based soft magnetic powder is embedded in the aluminum powder, and the gap between the iron-based soft magnetic powder particles increases, resulting in an increase in the volume and a decrease in the density of the entire iron-based soft magnetic composite powder, so that the composite material has high magnetic permeability and reduces the weight of the composite material.

[0004] According to one aspect of the present application, an iron-based soft magnetic composite powder is provided.

[0005] An iron-based soft magnetic composite powder, the iron-based soft magnetic composite powder comprising an iron-based soft magnetic powder and aluminum powder;

[0006] The iron-based soft magnetic powder is loaded on the aluminum powder.

[0007] Optionally, the iron-based soft magnetic powder is embedded in the aluminum powder.

[0008] Optionally, the weight ratio of the iron-based soft magnetic powder to the aluminum powder is 1:1 to 3.

[0009] Preferably, the weight ratio of the iron-based soft magnetic powder to the aluminum powder is 1:1 to 2.

[0010] Optionally, the weight ratio of the iron-based soft magnetic powder to the aluminum powder independently selects any value from 1:1, 1:1.5, 1:2, 1:2.5, 1:3.

[0011] Optionally, the iron-based soft magnetic powder is selected from one or more of iron-silicon-boron soft magnetic powder, iron-cobalt-barium powder, iron-cobalt-silicon soft magnetic powder, and iron-boron soft magnetic powder.

[0012] Optionally, the density of the iron-based soft magnetic composite powder is 3.0 to 6.0 g / cm 3 ;

[0013] According to another aspect of the present application, a method for preparing an iron-based soft magnetic composite powder is provided.

[0014] A method for preparing an iron-based soft magnetic composite powder includes the following steps:

[0015] Place a mixture containing iron-based soft magnetic powder and aluminum powder in a ball milling tank, and obtain an iron-based soft magnetic composite powder after ball milling.

[0016] Optionally, the ball milling time is 80 to 100 h;

[0017] Preferably, the ball milling time is 80 to 90 h.

[0018] Optionally, the ball milling time independently selects any value from 80 h, 85 h, 90 h, 95 h, 100 h or any range value between any two of them.

[0019] Optionally, the ball milling speed is 300 to 400 rpm;

[0020] Preferably, the ball milling speed is 300 to 370 rpm.

[0021] Optionally, the ball milling speed independently selects any value from 300 rpm, 350 rpm, 370 rpm, 400 rpm or any range value between any two of them.

[0022] Optionally, the ball milling is carried out under an inert gas;

[0023] Preferably, the inert gas is argon;

[0024] Wherein, before the inert gas is filled, the ball milling tank is vacuum.

[0025] According to the third aspect of the present application, an application of the iron-based soft magnetic composite powder is provided.

[0026] Application of the iron-based soft magnetic composite powder described above and / or the iron-based soft magnetic composite powder obtained by the preparation method described above in a shielding material.

[0027] The beneficial effects that can be produced by this application include:

[0028] 1) An iron-based soft magnetic composite powder provided by this application has the advantages of low density, good ductility, and high magnetic permeability. It can still have a high magnetic permeability in the composite material while reducing the addition amount of the iron-based soft magnetic powder, thereby reducing the weight of the entire composite material and broadening the application range of the composite material.

[0029] 2) A preparation method of an iron-based soft magnetic composite powder provided by this application has the advantages of simple preparation and convenient operation. Description of the Drawings

[0030] Figure 1 It is the hysteresis loop diagram of Example 1 and Comparative Example 1, where Figure a is the physical diagram of Example 1 and Figure b is the physical diagram of Comparative Example 1. Detailed Description of the Embodiments

[0031] The present application will be described in detail below in conjunction with the embodiments, but the present application is not limited to these embodiments.

[0032] Unless otherwise specified, the raw materials in the embodiments of the present application are all purchased through commercial channels, where:

[0033] The aluminum powder is purchased from Hebei Jisheng Aluminum Powder Co., Ltd.

[0034] The magnetic permeability of the iron-based soft magnetic composite powder is measured by measuring the induced electromotive force with a VSM instrument, and then the magnetic permeability can be calculated.

[0035] The density of the iron-based soft magnetic composite powder is measured by the immersion method using a solid, liquid, and powder density measuring device, and then the density is calculated according to ρ = m / v.

[0036] Example 1

[0037] Weigh 3 g of iron-silicon-boron powder and 3 g of aluminum powder and put them into a ball milling tank. Vacuumize, and after introducing argon, place the ball milling tank on a ball mill. Set the rotation speed to 300 rpm and the time to 80 h. After the ball milling is completed, take it out to obtain the iron-based soft magnetic powder.

[0038] Example 2

[0039] Weigh 3 g of iron-silicon-boron powder and 6 g of aluminum powder and put them into a ball milling tank. Vacuumize, and after introducing argon, place the ball milling tank on a ball mill. Set the rotation speed to 300 rpm and the time to 80 h. After the ball milling is completed, take it out to obtain the iron-based soft magnetic powder.

[0040] Example 3

[0041] Weigh 3 g of iron-silicon-boron powder and 9 g of aluminum powder and put them into the ball milling tank. Vacuumize it, and after introducing argon gas, place the ball milling tank on the ball mill. Set the rotation speed to 300 rpm and the time to 80 h. After the ball milling is completed, take it out to obtain the iron-based soft magnetic powder.

[0042] Example 4

[0043] Weigh 3 g of iron-silicon-boron powder and 6 g of aluminum powder and put them into the ball milling tank. Vacuumize it, and after introducing argon gas, place the ball milling tank on the ball mill. Set the rotation speed to 400 rpm and the time to 90 h. After the ball milling is completed, take it out to obtain the iron-based soft magnetic powder.

[0044] Example 5

[0045] Weigh 3 g of iron-silicon-boron powder and 6 g of aluminum powder and put them into the ball milling tank. Vacuumize it, and after introducing argon gas, place the ball milling tank on the ball mill. Set the rotation speed to 400 rpm and the time to 100 h. After the ball milling is completed, take it out to obtain the iron-based soft magnetic powder.

[0046] Example 6

[0047] Weigh 3 g of iron-cobalt-silicon-boron powder and 6 g of aluminum powder and put them into the ball milling tank. Vacuumize it, and after introducing argon gas, place the ball milling tank on the ball mill. Set the rotation speed to 300 rpm and the time to 80 h. After the ball milling is completed, take it out to obtain the iron-based soft magnetic powder.

[0048] Comparative Example 1

[0049] Weigh 6 g of iron-silicon-boron powder and put it into the ball milling tank. Vacuumize it, and after introducing argon gas, place the ball milling tank on the ball mill. Set the rotation speed to 300 rpm and the time to 80 h. After the ball milling is completed, take it out to obtain the iron-based soft magnetic powder.

[0050] The permeability of the iron-based soft magnetic powders prepared in Example 1 and Comparative Example 1 was tested, and the iron-silicon-boron / aluminum composite powder and the iron-silicon-boron powder were subjected to VSM. The test results are as Figure 1 shown. It can be seen that the permeability of the modified powder increases, indicating that the shielding performance of Example 1 is better than that of Comparative Example 1;

[0051] It can be seen from the physical photos in the figure that at the same mass, the volume of Figure a (Example 1) is larger than that of Figure b (Comparative Example 1), that is, the density of Example 1 decreases.

[0052] As described above, these are only several embodiments of the present application and do not impose any form of limitation on the present application. Although the present application is disclosed with preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the relevant art can make some changes or modifications within the scope of the technical solution of the present application by using the disclosed technical content, and these are all equivalent to equivalent embodiments and fall within the scope of the technical solution.

Claims

1. A kind of iron-based soft magnetic composite powder, characterized in that, The iron-based soft magnetic composite powder is composed of iron-based soft magnetic powder and aluminum powder; The iron-based soft magnetic powder is loaded on the aluminum powder; The iron-based soft magnetic powder is embedded on the aluminum powder; The weight ratio of the iron-based soft magnetic powder to the aluminum powder is 1:1 to 3; The preparation method of the iron-based soft magnetic composite powder comprises the following steps: Placing a mixture containing iron-based soft magnetic powder and aluminum powder in a ball milling tank, and obtaining the iron-based soft magnetic composite powder after ball milling; The ball milling is carried out under an inert gas.

2. The iron-based soft magnetic composite powder according to claim 1, wherein The weight ratio of the iron-based soft magnetic powder to the aluminum powder is 1:1 to 2.

5.

3. The iron-based soft magnetic composite powder according to claim 1, characterized in that, The iron-based soft magnetic powder is selected from one or more of iron-silicon-boron soft magnetic powder, iron-cobalt-barium powder, iron-cobalt-silicon soft magnetic powder, and iron-boron soft magnetic powder.

4. The iron-based soft magnetic composite powder according to claim 1, wherein The density of the iron-based soft magnetic composite powder is 3.0~6.0 g / cm 3 .

5. The iron-based soft magnetic composite powder according to claim 1, wherein The ball milling time is 80 to 100 h.

6. The iron-based soft magnetic composite powder according to claim 1, characterized in that, The ball milling time is 80 to 90 h.

7. The iron-based soft magnetic composite powder according to claim 1, wherein The ball milling speed is 300 to 400 rpm.

8. The iron-based soft magnetic composite powder according to claim 1, wherein The ball milling speed is 300 to 370 rpm.

9. The iron-based soft magnetic composite powder according to claim 1, wherein The inert gas is argon.

10. The iron-based soft magnetic composite powder according to claim 1, wherein Before the inert gas is filled, the ball milling tank is in a vacuum state.

11. Application of the iron-based soft magnetic composite powder according to any one of claims 1 to 10 in a shielding material.

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