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A kind of preparation method of electromagnetic wave absorber with large diameter-to-thickness ratio

A large diameter-to-thickness ratio, electromagnetic wave technology, applied in metal processing equipment, inorganic material magnetism, transportation and packaging, etc., can solve problems such as affecting electromagnetic wave absorption effect, high resistance of electromagnetic wave absorbing materials, and product performance degradation, and achieve energy consumption. Lowering, high economic value, large diameter-to-thickness ratio

Active Publication Date: 2018-05-22
广州蓝磁新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are generally the following deficiencies: 1. If a lubricant is added, due to the high requirements for dewaxing, if the dewaxing is not clean, the real part of the magnetic permeability will be seriously reduced, and the product performance will be reduced.
2. Especially when the content of lubricant or dispersant increases, although the flattening effect is good, but under the dewaxing pressure, the dewaxing is not clean, resulting in a decline in performance, and the gain outweighs the gain
3. In the existing process, the proportion of lubricant or dispersant must be strictly controlled within a range (<2%). During the high-speed flattening process, the alloy powder obtains a large amount of energy, resulting in The flattened powders form cold welding with each other, resulting in a large resistance of the electromagnetic absorbing material, which affects the absorption effect of electromagnetic waves

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1, solvent compounding: choose ethylene glycol and 120# solvent oil, mix and compound according to the ratio of 1:8.

[0029] Step 2, lubricant: use triglycerides of fatty acids, and the addition amount is 3% of the mass percentage of the magnetic powder, and the usage amount is adjusted.

[0030] Step 3, flattening ball milling: put the soft magnetic alloy powder and the mixed specific solvent into the ball mill according to the mass ratio of 20:1, and then add triglycerides of fatty acids according to 3% of the mass of the magnetic powder for flattening treatment, and the flattening treatment adopts directional The steel ball movement mode flattens the ball mill at the same speed.

[0031] Step 4, drying: the flattened material is separated from solid and liquid by a filter press, and then dried by a double-cone vacuum to further recover the solvent.

[0032] Step 5, dewaxing: The cavity of the dewaxing equipment is a vacuum treatment furnace with a multi-layer ...

Embodiment 2

[0036] Step 1, solvent compounding: choose propylene glycol and 90# solvent oil, mix and compound according to the ratio of 1:10.

[0037] Step 2, lubricant: use triglycerides of fatty acids, the addition amount is 5% of the mass percentage of the magnetic powder, and the usage amount is adjusted.

[0038] Step 3, flattening ball milling: Put the soft magnetic alloy powder and the mixed specific solvent into the ball mill according to the mass ratio of 20:1, and then add triglycerides of fatty acids according to 5% of the mass of the magnetic powder for flattening treatment, and the flattening treatment adopts directional The steel ball movement mode flattens the ball mill at the same speed.

[0039] Step 4, drying: the flattened material is separated from solid and liquid by a filter press, and then dried by a double-cone vacuum to further recover the solvent.

[0040] Step 5, dewaxing: The cavity of the dewaxing equipment is a vacuum treatment furnace with a multi-layer plu...

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Abstract

The patent of the present invention provides a preparation method of an electromagnetic wave absorber with a large diameter-to-thickness ratio. It mainly performs flake treatment on the soft magnetic alloy powder in the presence of a solvent medium and a specific proportion of an environmentally friendly lubricant, and then bakes it. Dry, especially the large-diameter-thick-ratio electromagnetic wave absorber formed after the heat treatment and annealing treatment of the specified dewaxing process, has uniform particle size and shape, round and smooth surface, and excellent magnetic properties.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and in particular relates to a preparation method of an electromagnetic wave absorber with a large diameter-to-thickness ratio. Background technique [0002] In a modern society with rapid development of science and technology, electronic products are changing with each passing day. While enriching people's life content, they also bring a magnetic field formed by electromagnetic waves, which makes electronic devices interfere with each other and exposes the human body to electromagnetic radiation. Finding various high-performance materials that can absorb or weaken electromagnetic waves, that is, microwave absorbers, has gradually become a goal pursued by material scientists. [0003] In the application field of wave absorbing agent, compared with other materials, the flat sheet of Fe-based soft magnetic alloy material has the characteristics of high magnetic permeability and low price. It has b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/20B22F1/00
CPCH01F1/20B22F1/107B22F1/142
Inventor 汪涛
Owner 广州蓝磁新材料科技有限公司
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