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

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...

AI Technical Summary

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

Images