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Manufacturing method of compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer

A nanocrystalline soft magnetic and composite electromagnetic technology, applied in the direction of magnetic/electric field shielding, shielding, electrical components, etc., can solve the problems of difficult process control, reduced magnet shielding effect, and no soft magnetic alloy powder, etc., to achieve strong anti-corrosion The effect of anti-oxidation ability, improving anti-electromagnetic interference performance and excellent electrical insulation performance

Inactive Publication Date: 2005-08-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] There are following deficiencies in the prior art: (1) the flat soft magnetic alloy powder used is difficult to prepare: one method is obtained by crushing amorphous alloy strips, and the preparation process is complicated due to the need to first obtain amorphous alloy strips. The cost is high; another method is to use the atomization method to prepare spherical metal powder, and then use a sand mill to grind the spherical powder to obtain a flat shape. This technology for preparing flake alloy micropowder requires extremely high equipment and process control. extremely difficult
(2) The soft magnetic alloy powder used mainly includes iron-based amorphous Fe-Si-Al-Ni, Fe-Si-Al, Cr-Si-Al-Fe, Fe-Ni, Fe-Ni-Mo, Fe- Si-Al, Fe-Ni-Co series alloys do not have the best comprehensive magnetic properties
(3) The existing technology only involves adding appropriate coupling agent to improve the bonding effect of metal magnetic powder and polymer, and does not carry out anti-corrosion treatment on soft magnetic alloy powder, and the anti-corrosion and anti-oxidation capabilities of metal magnetic powder directly affect the composite absorber. Stability of Wave Material Properties
(4) The existing technologies all adopt the direct mixing of soft magnetic alloy particles and polymers for molding processing. Due to the difference in specific gravity between alloy magnetic powders and polymers, in order to mix the two materials evenly, forced mixing must be carried out. Greater stress reduces the shielding effect of the magnet

Method used

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  • Manufacturing method of compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer

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Experimental program
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Effect test

Embodiment 1

[0033] In the first step, 82.5 parts of pure iron, 1.5 parts of copper, 5.5 parts of niobium, 9 parts of silicon and 1.5 parts of boron are used as raw materials to melt in an intermediate frequency vacuum induction melting furnace to obtain master alloy ingots. After the master alloy ingots are broken, use Melt rapid solidification technology adopts cooling roll surface speed of 40 m / s, melting temperature is controlled at 1500°C, feeding speed is 100 g / min, and melting chamber pre-pumping is 5×10 -3 Pa vacuum, and then filled with argon gas to produce nanocrystalline Fe-B-Si-Nb-Cu alloy flakes with a thickness of 10 microns. The quick-quenched flakes were crushed by vacuum rolling ball milling process, and then obtained by sieving with a particle size of 25~ For soft magnetic alloy particles of 30 microns, vacuum anneal the powder at 500°C for 120 minutes to control the average grain size of the soft magnetic alloy powder to about 10 nanometers;

[0034] The second step is t...

Embodiment 2

[0038] In the first step, 75 parts of pure iron, 1 part of copper, 6 parts of niobium, 15 parts of silicon and 3 parts of boron are used as raw materials to melt in an intermediate frequency vacuum induction melting furnace to obtain master alloy ingots. After crushing the master alloy ingots, use The melt rapid solidification technology adopts the cooling roller surface speed of 32 m / s, the melting temperature is controlled at 1500 ° C, the melting chamber is pre-evacuated, and then filled with argon to produce nanocrystalline Fe-B-Si with a thickness of 18 microns - Nb-Cu alloy flakes, using vacuum rolling ball milling process to crush the quick-quenched flakes, and then sieving to obtain soft magnetic alloy particles with a particle size of 50-75 microns, and vacuum annealing the fine powder at 550°C for 60 minutes to control the The average grain size of the magnetic alloy powder is about 20 nanometers;

[0039] In the second step, the ring disbody (C16H16) of p-xylene is ...

Embodiment 3

[0043] In the first step, 85 parts of pure iron, 1 part of niobium, 12.5 parts of silicon and 1.5 parts of boron are used as raw materials to melt in an intermediate frequency vacuum induction melting furnace to obtain master alloy ingots. After the master alloy ingots are broken, the melt is rapidly solidified The technology adopts 25 m / s surface speed of the cooling roll, the melting temperature is controlled at 1500°C, the melting chamber is pre-evacuated, and then filled with argon to produce nanocrystalline Fe-B-Si-Nb alloy flakes with a thickness of 25 microns , using the vacuum rolling ball milling process to crush the quick-quenching scales, and then sieving to obtain soft magnetic alloy particles with a particle size of 80-100 microns, and vacuum annealing the fine powder at 600 ° C for 30 minutes to control the average grain size of the soft magnetic alloy fine powder The particle size is about 30 nm;

[0044] In the second step, the ring disbody (C16H16) of p-xylene...

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Abstract

This invention is a producing method of the nanometer crystal floppy magnetism alloy powder polymer mulriple electromagnetism shield body. The method adopt the technology of melting body fast curdling to produce the Fe-B-Si-Nb-Cu or the Fe-Si-Al serial of alloy squamas, and stave them to obtain the floppy magnetism alloy particulates, then anneal in vacuum; use the vacuum vaporing and plating technology to deposit a layer of polymeric opposite two methylic benzene membrane on the surface of the magnetic powders; add the magnetic powders into the polymeric monomer solution to produce the suspending system; use the pressed pieces to extrude a pressed and extended technics to produce the mentioned nanometer crystal floppy magnetism alloy powder polymer mulriple electromagnetism shield body. The technics of this invention is simple, its cost is low, the anticorrosive produced magnet has very high chemistry stability, and the magnet shield effect is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of anti-electromagnetic interference materials and magnet molding processing, in particular to a preparation method of a nanocrystalline soft magnetic alloy powder polymer composite electromagnetic shielding magnet. Background technique [0002] With the rapid development of information technology, especially the rapid popularization of mobile communications, computers, and household appliances, electronic products have been widely used in various fields of people's daily production and life. At the same time, in order to reduce the size of the equipment and improve the performance of the equipment, the operating frequency of various electronic equipment is getting higher and higher. Taking a personal computer as an example, the clock frequency of the CPU has reached above 4GHz, and the operating frequencies of many other personal electronic devices are mostly in the quasi...

Claims

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Application Information

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IPC IPC(8): G12B17/02H05K9/00
Inventor 车晓舟
Owner SOUTH CHINA UNIV OF TECH
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