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Method for preparing Fe-Si-Al soft magnetic material with high microwave permeability

A fe-si-al, soft magnetic material technology, applied in the direction of inorganic material magnetism, can solve the problems of high density, difficult to improve microwave permeability, large electrical conductivity, etc., achieve simple process, improve microwave permeability, Easy-to-use effects

Inactive Publication Date: 2012-08-01
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

In addition, ferrite materials also have disadvantages such as high density and poor temperature stability, which prompts people to seek new microwave magnetic materials.
Alloy soft magnetic materials are the current research hotspots. Fe-Si-Al alloy is one of them. However, due to the high electrical conductivity and low magnetocrystalline anisotropy constant of this type of material, its microwave Magnetic permeability is difficult to improve, so people are looking for a way to break through this technical bottleneck

Method used

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  • Method for preparing Fe-Si-Al soft magnetic material with high microwave permeability
  • Method for preparing Fe-Si-Al soft magnetic material with high microwave permeability
  • Method for preparing Fe-Si-Al soft magnetic material with high microwave permeability

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Embodiment Construction

[0037] The present invention uses the Fe-Si-Al alloy powder obtained by the water mist method to control the particle size of the powder by the sub-sieve method, and then performs flake treatment on the powder in different particle size ranges, and finds Fe-Si-Al alloy powder with a small particle size. The microwave permeability of Si-Al alloy powder can be greatly improved after flaky treatment.

[0038] The present invention comprises the following steps:

[0039] 1) 100-mesh Fe-Si-Al raw powder is sieved through 100-mesh (150μm), 200-mesh (75μm), 300-mesh (48μm), 400-mesh (38μm) and 500-mesh (25μm) sieves to obtain 75μm-150μm , 48μm~75μm, 38μm~48μm, 25μm~38μm and less than 25μm Fe-Si-Al alloy powder.

[0040] 2) Put the Fe-Si-Al alloy powders obtained in step 1) in two particle size ranges of 75 μm to 150 μm and 48 μm to 75 μm into a high-energy ball mill for flaking treatment, and the ball-to-material ratio is 25:1 Weigh quantitative Fe-Si-Al alloy powders and balls of tw...

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Abstract

The invention discloses a method for preparing a Fe-Si-Al soft magnetic material with high microwave permeability, belonging to the field of magnetic materials with high-frequency magnetic properties. The method disclosed by the invention comprises the following steps of: (1) sieving 100-mesh Fe-Si-Al raw powder by using a 100-mesh sieve, a 200-mesh sieve and a 300-mesh sieve, wherein the powder being 75-150 microns is called as the A-class powder, and the powder being 48-75 microns is called as the B-class powder, and the Fe-Si-Al raw powder comprises the following components in weight percentage: (82.6-x-7) percent of Fe, (10.3+x) percent of Si and (7.1+y) percent of Al; the absolute value of x is not more than 0.7 and the absolute vale of y is not more than 1.7; (2) carrying out flaky treatment and controlling the ratio of average grain size / thickness of the powder body to be 14-26; and (3) mixing the powder again to obtain the soft magnetic alloy powder body with high microwave permeability according to the mass ratio of the A-class powder to the B-class powder of 0.5-2. The method for preparing the Fe-Si-Al soft magnetic material with high microwave permeability disclosed by the invention has a simple process and is convenient to operate; the Fe-Si-Al alloy powder is sieved before mechanical ball milling, so that the microwave permeability is improved favorably; if the flaky treatment is further carried out, the microwave permeability can be improved by a large margin.

Description

technical field [0001] The invention belongs to the field of high-frequency magnetic performance magnetic materials. Background technique [0002] With the rapid development of electronic information technology, the working frequency of electronic and electrical equipment or systems is constantly developing to the microwave frequency band or higher frequency band, and the resulting electromagnetic interference (EMI) has increasingly become a major technical problem and electromagnetic environmental pollution problem. . Electromagnetic pollution has caused great harm to the public environment, personal safety, and military safety. Therefore, it is of great significance to study materials with anti-EMI properties in the microwave frequency band. The high-frequency magnetic permeability of magnetic materials is a very key technical index that determines EMI performance. For example, higher microwave magnetic permeability can improve the suppression effect of electromagnetic no...

Claims

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Application Information

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IPC IPC(8): H01F1/20B22F1/00
Inventor 韩满贵秦军锋邓龙江
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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