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A kind of preparation method of fe-si-al soft magnetic material with high microwave magnetic permeability

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

Inactive Publication Date: 2014-10-15
UNIV OF ELECTRONICS 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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  • A kind of preparation method of fe-si-al soft magnetic material with high microwave magnetic permeability
  • A kind of preparation method of fe-si-al soft magnetic material with high microwave magnetic permeability
  • A kind of preparation method of fe-si-al soft magnetic material with high microwave magnetic permeability

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Embodiment Construction

[0036] 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.

[0037] The present invention comprises the following steps:

[0038] 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.

[0039]2) Put the Fe-Si-Al alloy powders obtained in step 1) into the high-energy ball mill for flaking treatment with the particle size ranges of 75 μm to 150 μm and 48 μm to 75 μm, respectively, at a ratio of 25:1. Weigh quantitative Fe-Si-Al alloy powders and balls of tw...

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Abstract

The invention discloses a preparation method of Fe-Si-Al soft magnetic material with high microwave magnetic permeability, which belongs to the field of high-frequency magnetic performance magnetic materials. The present invention includes the following steps: 1) 100-mesh Fe-Si-Al raw powder is sieved through 100-mesh, 200-mesh, and 300-mesh sieves in turn, and the 75 μm-150 μm powder is called A type powder, and the 48 μm-75 μm powder is called B type. Powder; the mass percent of the Fe-Si-Al raw powder component is: Fe: (82.6-x-y)%, Si: (10.3+x)%, Al: (7.1+y)%, |x|≤ 0.7, |y|≤1.7; 2) Flake treatment, control the average particle size / thickness ratio of the powder between 14 and 26; 3) Remix according to the mass ratio of Class A: Class B = 0.5 to 2 to obtain high Microwave permeability soft magnetic alloy powder. The invention has simple process and convenient operation, and the Fe-Si-Al alloy powder is sieved before mechanical ball milling, which can improve its microwave magnetic permeability, and can greatly increase its microwave magnetic permeability if it is further processed into flakes.

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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/20B22F1/00
Inventor 韩满贵秦军锋邓龙江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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