Ferrite wave-absorbing material used for injection moulding, preparation method thereof and magnetic wave-absorbing element

A wave-absorbing material and injection molding technology, which is applied in ceramic molding machines, electrical components, manufacturing tools, etc., can solve the problems that wave-absorbing devices cannot be made into shapes, the scope of use is limited, and injection molding cannot be done, so that the crystal grains are arranged neatly , Guarantee the effect of free growth and complex shape

Inactive Publication Date: 2011-09-07
BGRIMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional ferrite material has a high density and a thick thickness, so it cannot be injection molded, and cannot be made into wave-absorbing devices with complex shapes, and its application range is greatly limited.

Method used

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  • Ferrite wave-absorbing material used for injection moulding, preparation method thereof and magnetic wave-absorbing element
  • Ferrite wave-absorbing material used for injection moulding, preparation method thereof and magnetic wave-absorbing element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This embodiment provides a ferrite absorbing material for injection molding, the molecular formula of the absorbing material is:

[0020] A 2 (B x +C 2-x )Fe 12 o 22

[0021] In the above molecular formula: A is Sr (strontium) or Ba (barium), B and C are Mn (manganese), Ni (nickel), Zn (zinc), Mg (magnesium), Co (cobalt), Cu (copper) or Any one of Ca (calcium), the value range of x is: 0≤x≤2.

[0022] The preparation method of the above-mentioned absorbing material is specifically:

[0023] The following raw materials are used, including:

[0024] Flux, can adopt any one in calcium oxide, magnesium oxide, bismuth oxide, strontium chloride, barium chloride;

[0025] Raw material one adopts any one in strontium carbonate or barium carbonate;

[0026] Raw materials 2 and 3 are manganese oxide, manganese carbonate, nickel oxide, nickel carbonate, zinc oxide, zinc carbonate, magnesium oxide, magnesium carbonate, cobalt oxide, cobalt carbonate, copper oxide, copper c...

Embodiment 2

[0039] This embodiment provides a microwave-absorbing material prepared in the prior art, specifically:

[0040] 0.1mol BaCO 3 powder, 0.07mol NiO powder, 0.03mol ZnO powder and 0.3mol Fe 2 o 3 Weigh the powder, put it into a ball mill for wet mixing for 5 hours (the ratio of ball to material is 10:1); add 0.1mol of flux, stir evenly, dry, dry press molding (molding pressure 1.5MPa); Heat preservation for 4 hours and pre-fire; break the pre-fired magnetic block into small pieces, and then put it into a ball mill for wet grinding for 1 hour (the ratio of ball to material is 10:1); wash, dry, and disperse to obtain absorbent powder; Through the injection process, the required magnet wave absorbing device is made. The electromagnetic wave reflectivity curve of the wave-absorbing material that this comparison example 2 makes sees attached figure 1 ,from figure 1 It can be seen that there is a peak at 9GHz, and the reflectivity is -4.5dB, which has good absorbing performance. ...

Embodiment 3

[0042] This embodiment provides a microwave-absorbing material prepared in the prior art, specifically:

[0043] 0.1mol SrCO 3 powder, 0.07mol MgO powder, 0.03mol ZnO powder and 0.3mol Fe 2 o 3 Weigh the powder, put it into a ball mill for wet mixing for 3 hours (the ratio of ball to material is 10:1); add 0.2 mol of flux, stir evenly, dry, dry press molding (molding pressure 1.5MPa); Heat preservation for 4 hours and pre-fire; break the pre-fired magnetic block into small pieces, and then put it into a ball mill for wet grinding for 1 hour (the ratio of ball to material is 10:1); wash, dry, and disperse to obtain absorbent powder; Through the injection process, the required magnet wave absorbing device is made. The electromagnetic wave reflectivity curve of the wave-absorbing material that this comparison example 2 makes sees attached figure 2 ,from figure 2 It can be seen that there is a peak at 4GHz, and the reflectivity is -4.3dB, which has good absorbing performanc...

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Abstract

The invention discloses a ferrite wave-absorbing material used for injection moulding, a preparation method thereof and a magnetic wave-absorbing element. The molecular formula of the wave-absorbing material is A2(Bx+C2-x)Fe12O22, wherein A is Sr or Ba, B and C are selected from Mn, Ni, Zn, Mg, Co, Cu or Ca, x is no less than 0 and no more than 2. The invention also provides the preparation method of the wave-absorbing material and the magnetic wave-absorbing element. A fluxing agent is introduced in the preparation of the ferrite wave-absorbing material, thus the free growth of crystal particles can be ensured, the bond strength between crystal particles can be reduced simultaneously, ideal hexagonal flaky crystal particles can be obtained, and the surface density of the wave-absorbing material can be effectively reduced; and injection moulding is utilized for moulding, thus the wave-absorbing element with order crystal particles and complex shape can be prepared. The wave-absorbing material disclosed by the invention can be used in different electromagnetic environments and have wide application value in the aspects for preventing the influences of electromagnetic radiation on a human body and equipment, improving the pollutions of the space electromagnetic environment and the like.

Description

technical field [0001] The invention relates to the field of preparation of ferrite wave-absorbing materials, in particular to a ferrite wave-absorbing material for injection molding, a preparation method thereof and a magnetic wave-absorbing device. Background technique [0002] With the continuous development of human production activities and the continuous progress of industrial civilization, the electromagnetic radiation caused by various electronic equipment, information terminals, communication systems, etc. is increasing, which has gradually become a global public hazard. This electromagnetic radiation has a significant impact on the reliability and accuracy of various electrical components, and its harm to the human body has also been widely confirmed by the medical profession. How to effectively protect against electromagnetic radiation has become an important topic in the global scientific and technological circles. [0003] At present, wave-absorbing devices are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622B28B1/14G21F1/06H05K9/00
Inventor 陶振声范学伟廖有良吕宝顺要继忠王倩
Owner BGRIMM TECH CO LTD
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