A kind of preparation method of low-frequency sound-absorbing material

A sound-absorbing material and low-frequency technology, which is applied in the field of preparation of low-frequency sound-absorbing materials, can solve the problems that the sound-absorbing performance of metal fiber porous materials cannot be exerted normally, changing porous materials, and poor sound-absorbing performance at low frequencies, etc., to achieve sound-absorbing performance Excellent, improved low-frequency sound absorption performance, and the effect of improving sound absorption performance

Active Publication Date: 2017-09-22
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the sound absorption performance of the material in the full frequency range, a metal fiber porous material with gradient holes is used. This material can maintain stable sound absorption performance in a wide frequency range, but the sound absorption performance at low frequencies is still very low. In addition, some use environments have very strict requirements on material thickness, and only millimeter-level thickness materials are allowed to be used for sound absorption and noise reduction treatment, which makes the sound absorption performance of metal fiber porous materials unable to perform normally.
How to improve the low-frequency sound absorption performance of metal fiber porous materials has always been a technical problem in this field. At present, it cannot be realized by changing the structural parameters of porous materials alone.

Method used

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  • A kind of preparation method of low-frequency sound-absorbing material
  • A kind of preparation method of low-frequency sound-absorbing material
  • A kind of preparation method of low-frequency sound-absorbing material

Examples

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Embodiment 1

[0030] The preparation method of the low-frequency sound-absorbing material of this embodiment comprises the following steps:

[0031] Step 1. Mix the aluminum powder with an average particle size of 30 μm and the polyvinyl alcohol aqueous solution with a mass percentage concentration of 5% to obtain a slurry 3. The mass percentage of the aluminum powder in the slurry 3 is 10%, and then the The slurry 3 is evenly coated on the upper and lower surfaces of the aluminum foil 2 with a thickness of 0.4 mm, and the coating thickness is 20 μm;

[0032] Step 2, select the multi-layer iron-chromium-aluminum fiber porous material 1, the maximum pore diameter D of the iron-chromium-aluminum fiber porous material 1 in each layer max are not the same, the D max Satisfy: Where d is the wire diameter of FeCrAl fiber in FeCrAl fiber porous material 1, ε is the porosity of FeCrAl fiber porous material 1, D max The units of and d are both μm; the number of layers of the multilayer Fe-Cr-Al ...

Embodiment 2

[0040] The preparation method of the low-frequency sound-absorbing material of this embodiment comprises the following steps:

[0041] Step 1. Mix the aluminum powder with an average particle size of 40 μm and the polyvinyl alcohol aqueous solution with a mass percentage concentration of 4% to obtain a slurry 3. The mass percentage of the aluminum powder in the slurry 3 is 15%, and then the The slurry 3 is evenly coated on the upper and lower surfaces of the aluminum foil 2 with a thickness of 0.25 mm, and the coating thickness is 30 μm;

[0042] Step 2, select the multi-layer iron-chromium-aluminum fiber porous material 1, the maximum pore diameter D of the iron-chromium-aluminum fiber porous material 1 in each layer max are not the same, the D max Satisfy: Where d is the wire diameter of FeCrAl fiber in FeCrAl fiber porous material 1, ε is the porosity of FeCrAl fiber porous material 1, D maxThe units of and d are both μm; the number of layers of the multilayer Fe-Cr-Al ...

Embodiment 3

[0049] The preparation method of the low-frequency sound-absorbing material of this embodiment comprises the following steps:

[0050] Step 1, uniformly mixing aluminum powder with an average particle size of 20 μm and 3% polyvinyl alcohol aqueous solution to obtain slurry 3, wherein the mass percent of aluminum powder in the slurry 3 is 20%, and then The slurry 3 is evenly coated on the upper and lower surfaces of the aluminum foil 2 with a thickness of 0.1 mm, and the coating thickness is 10 μm;

[0051] Step 2, select the multi-layer iron-chromium-aluminum fiber porous material 1, the maximum pore diameter D of the iron-chromium-aluminum fiber porous material 1 in each layer max are not the same, the D max Satisfy: Where d is the wire diameter of FeCrAl fiber in FeCrAl fiber porous material 1, ε is the porosity of FeCrAl fiber porous material 1, D max The units of and d are both μm; the number of layers of the multilayer iron-chromium-aluminum fiber porous material 1 se...

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Abstract

The invention provides a method for preparing a low-frequency sound-absorbing material, which includes the following steps: 1. Mix aluminum powder and polyvinyl alcohol aqueous solution uniformly to obtain slurry, and then apply the slurry evenly on the surface of aluminum foil; 2. Select multiple Layer iron-chromium-aluminum fiber porous material; 3. Stack the selected iron-chromium-aluminum fiber porous material in order, and insert aluminum foil coated with slurry between every two adjacent layers of iron-chromium-aluminum fiber porous material, Obtain the billet to be sintered; 4. Put the billet to be sintered into a sintering mold, put it into a vacuum sintering furnace for sintering, and obtain a low-frequency sound-absorbing material. The sound-absorbing material prepared by the invention has an average sound-absorption coefficient of 0.25-0.35 at a frequency of 50 Hz-500 Hz, has excellent sound-absorbing performance, and can be widely used in the field of precision electronic components with low-frequency sound-absorbing requirements or other sound-absorbing materials place.

Description

technical field [0001] The invention belongs to the technical field of sound-absorbing materials, and in particular relates to a preparation method of low-frequency sound-absorbing materials. Background technique [0002] The metal fiber porous material has interconnected pores inside, and the porosity can reach up to 95%. It also has many functional properties, such as oxidation resistance, heat corrosion resistance, air impact resistance, long service life, easy processing, and controllable porosity. , Not only has good air permeability, but also has a stable and excellent ability to absorb noise. In special environments such as aerospace and national defense, it has the ability to absorb high-intensity noise that is incomparable to other materials. The single-layer metal fiber porous material has good sound absorption performance at high frequency. With the increase of thickness, the sound absorption peak of porous material moves to low frequency, but the sound absorption...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/04G10K11/162
Inventor 敖庆波汤慧萍王建忠支浩马军李爱君许忠国
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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