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Sheet ferrite electromagnetic composite material and preparation method thereof

An electromagnetic composite material and ferrite technology, applied in fibrous fillers, chemical instruments and methods, inorganic pigment treatment, etc., can solve the problems that spherical ferrite materials are difficult to meet, and achieve the effect of ensuring uniformity

Active Publication Date: 2019-09-27
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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  • Sheet ferrite electromagnetic composite material and preparation method thereof
  • Sheet ferrite electromagnetic composite material and preparation method thereof
  • Sheet ferrite electromagnetic composite material and preparation method thereof

Examples

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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 1.2MPa, and finally a ferrite / epoxy resin composite material was 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 place 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 at room temperature for 0.5h, 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 the mold, cured in an autoclave at 110°C under a pressure of 1.2MPa, and finally a sheet-like FeSiAl / epoxy resin composite material was obtained.

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Abstract

The invention relates to a sheet ferrite electromagnetic composite material and a preparation method thereof. According to the preparation method, the composite material is prepared by using a sheet ferrite, a coupling modifier, resin, a curing agent and a diluent as raw materials and ball milling, mixing and molding the raw material components; the process conditions for preparing the sheet ferrite by ball milling are as follows: ferrite powder, steel balls, a ball milling assistant and a volatile solvent are subjected to ball milling for 7 to 8 h at the rotation of 400 to 500 r / min; the steel balls include 8 mm diameter steel balls and a 6 mm diameter steel balls. A ball milling method is adopted to prepare the sheet ferrite powder; by coupling modification and compounding with epoxy resin, and applying an autoclave process or ultrasonic curing, an electromagnetic load composite material is formed, which exhibits high electromagnetic parameters at 1 to 18 GHz and can be widely used in various fields such as radar, navigation, satellite communication, electronic countermeasures, broadcast television, mobile communication and the like.

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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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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