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A kind of flake ferrite electromagnetic composite material and preparation method thereof

An electromagnetic composite material, ferrite technology, applied in fibrous fillers, chemical instruments and methods, inorganic pigment processing, etc., can solve the problem of spherical ferrite materials being difficult to meet, achieve good impedance matching, avoid optimal design, The effect of excellent electromagnetic properties

Active Publication Date: 2022-02-15
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous improvement of the frequency band used in equipment units, spherical ferrite materials have been difficult to meet

Method used

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  • A kind of flake ferrite electromagnetic composite material and preparation method thereof
  • A kind of flake ferrite electromagnetic composite material and preparation method thereof
  • A kind of flake ferrite electromagnetic composite material and preparation method thereof

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preparation example Construction

[0060] More comprehensively, the preparation method provided by the invention may include the following preparation steps:

[0061] (1) Ball milling step: ferrite powder, steel balls, ball milling aids and volatile solvents are ball milled for 7-8 hours at a speed of 400-500r / min, and the rigid balls include steel balls with a diameter of 8mm and steel balls with a diameter of 6mm Balls, to get flake ferrite. The mass ratio of the ferrite powder, the steel ball, the ball milling aid and the volatile solvent is preferably (100-130): (350-500): (0.01-0.05): (200- 300), more preferably (115-120): (400-450): (0.02-0.03): (250-300). The mass ratio of the 8mm diameter steel ball to the 6mm diameter steel ball is preferably 5:7. The ball milling aid can be calcium stearate. The volatile solvent can be acetone.

[0062] (2) Coupling modification step: mixing the coupling modifier and the flake ferrite prepared in step (1) to obtain the flake ferrite after coupling treatment. The ...

Embodiment 1

[0072] Weigh 18g epoxy resin, 4g 501 diluent, 3g 2-ethyl-4-methylimidazole, mix and stir at room temperature for 0.5h.

[0073] Subsequently, 75 g of untreated FeSiAl powder was added, and 0.24 g of KH-550 was added, and mixed and stirred for 8 hours under vacuum assistance to obtain a mixed slurry.

[0074] Finally, the mixed slurry was poured into a mold, cured in an autoclave at 110°C under a pressure of 1.2 MPa, and a ferrite / epoxy resin composite material was finally obtained.

Embodiment 2

[0076] Mix 400g of steel balls (167g of 8mm diameter steel balls + 233g of 6mm diameter steel balls) with 120g of FeSiAl powder, then add 0.02g of calcium stearate and 250mL of acetone together and put them in a ball mill jar, and perform high energy ball milling at a fixed speed of 450r / min for 7.5h , to obtain sheet-shaped ferrite with an average sheet length of 30-35μm, and its microscopic topography refers to figure 1 .

[0077] Weigh 18g epoxy resin, 4g 501 diluent, 3g 2-ethyl-4-methylimidazole, mix and stir for 0.5h at room temperature, then add 75g ball-milled flake FeSiAl powder, then add 0.24gKH-550, in Mix and stir for 8 h under vacuum assistance to obtain a mixed slurry.

[0078] Finally, the composite slurry was poured into a mold, cured in an autoclave under a pressure of 1.2MPa and 110°C, and a sheet-like FeSiAl / epoxy resin composite material was finally obtained.

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Abstract

The invention relates to a sheet ferrite electromagnetic composite material and a preparation method thereof. The preparation method uses flake ferrite made by ball milling, coupling modifier, resin, curing agent and diluent as raw materials, and mixes and shapes each raw material component to obtain the composite material; wherein, The process conditions for preparing flake ferrite by ball milling are: ball milling ferrite powder, steel balls, ball milling aids and volatile solvents for 7-8 hours at a speed of 400-500r / min; the rigid balls include 8mm diameter steel balls and 6mm diameter steel balls. The present invention adopts the ball milling method to prepare flake ferrite powder, compound it with epoxy resin through coupling modification, and use the autoclave process or ultrasonic curing to form the electromagnetic load composite material, which exhibits high electromagnetic load at 1-18GHz. parameters, and can be widely used in electronic equipment in various fields such as radar, navigation, satellite communication, electronic countermeasures, radio and television, and mobile communication.

Description

technical field [0001] The invention relates to the technical field of electromagnetic functional composite materials, in particular to a sheet-shaped ferrite electromagnetic composite material and a preparation method thereof. Background technique [0002] With the rapid development of high-end electronic equipment, the technical requirements for the performance of electronic components in the equipment are also getting higher and higher. Among them, electromagnetic interference between components in a limited space is inevitable, which will seriously interfere with the communication function of the antenna system, weaken the transmission strength of the signal, and even make the antenna completely invalid. Magnetic permeability and magnetic loss electromagnetic shielding materials can effectively solve this problem. [0003] Ferrite has the characteristics of low price, simple preparation process, and good microwave absorption performance. It is a microwave attenuation ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08K9/06C08K3/34C09C3/04C09C1/24
CPCC08K9/06C08K3/34C09C3/041C09C1/245C08L2203/20C08K2201/01C08L63/00
Inventor 兰天李南孟庆杰张春波郭世峰
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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