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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 problems such as low low-frequency sound-absorbing performance, inability to meet the use requirements of electronic components, and restrict large-scale applications, and achieve high-strength, sound-absorbing performance Excellent, solve the effect of poor sound absorption performance

Active Publication Date: 2017-03-15
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thin metal fiber porous materials have low low-frequency sound absorption performance and cannot meet the requirements of electronic components, thus becoming a bottleneck restricting their large-scale application

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] combine figure 1 and figure 2 , the preparation method of the low-frequency sound-absorbing material of this embodiment includes the following steps:

[0037] Step 1, adding copper powder with a particle size of 10 μm into polyvinyl alcohol aqueous solution and mixing uniformly to obtain a slurry; the mass percentage of copper powder in the slurry is 8%, and the balance is polyvinyl alcohol aqueous solution; The mass percentage concentration of polyvinyl alcohol aqueous solution is 2%;

[0038] Step 2, uniformly coating the slurry described in step 1 on the surface of the dense metal plate, then placing the dense metal plate coated with the slurry in a drying oven to dry, and obtaining a powder coating on the surface of the dense metal plate; The drying temperature is 120°C, and the drying time is 1 hour; the thickness of the powder coating is 0.1 mm; the material of the dense metal plate is stainless steel;

[0039] Step 3. Lay the metal fiber made of stainless ste...

Embodiment 2

[0043] combine figure 1 and figure 2 , the preparation method of the low-frequency sound-absorbing material of this embodiment includes the following steps:

[0044]Step 1, adding copper powder with a particle size of 20 μm into polyvinyl alcohol aqueous solution and mixing uniformly to obtain a slurry; the mass percentage of copper powder in the slurry is 10%, and the balance is polyvinyl alcohol aqueous solution; The mass percentage concentration of polyvinyl alcohol aqueous solution is 3%;

[0045] Step 2, uniformly coating the slurry described in step 1 on the surface of the dense metal plate, then placing the dense metal plate coated with the slurry in a drying oven to dry, and obtaining a powder coating on the surface of the dense metal plate; The drying temperature is 120°C, and the drying time is 2 hours; the thickness of the powder coating is 0.15 mm; the material of the dense metal plate is iron-chromium-aluminum alloy;

[0046] Step 3. Lay metal fibers made of i...

Embodiment 3

[0050] combine figure 1 and figure 2 , the preparation method of the low-frequency sound-absorbing material of this embodiment includes the following steps:

[0051] Step 1, adding copper powder with a particle size of 45 μm into polyvinyl alcohol aqueous solution and mixing uniformly to obtain a slurry; the mass percentage of copper powder in the slurry is 12%, and the balance is polyvinyl alcohol aqueous solution; The mass percent concentration of the polyvinyl alcohol aqueous solution is 5%.

[0052] Step 2, uniformly coating the slurry described in step 1 on the surface of the dense metal plate, then placing the dense metal plate coated with the slurry in a drying oven to dry, and obtaining a powder coating on the surface of the dense metal plate; The drying temperature is 120°C, and the drying time is 1.5h; the thickness of the powder coating is 0.2mm; the material of the dense metal plate is Fe-Cr-Al alloy;

[0053] Step 3. Lay metal fibers made of iron-chromium-alum...

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Abstract

The invention provides a preparation method of a low-frequency sound absorbing material. The preparation method of the low-frequency sound absorbing material comprises the following steps: 1) adding copper powder into polyvinyl alcohol aqueous solution and performing uniform mixing to obtain slurry; 2) uniformly coating the slurry on the surface of a compact metal plate and performing drying to obtain a powder coating layer; 3) laying metal fibers on the compact metal plate, performing pressing and then performing sintering to obtain a metal fiber porous composite material; 4) punching holes in the metal fiber porous composite material to obtain the low-frequency sound absorbing material. The average sound absorbing coefficient of the low-frequency sound absorbing material prepared by using the preparation method provided by the invention at frequency of 500Hz-1000Hz reaches 0.20-0.35, the sound absorbing performance is excellent, and the low-frequency sound absorbing material can be widely applied to the fields of precise electronic parts and components having low-frequency sound absorbing requirements or other sound silencing places.

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] Environmental noise will have a huge impact on the accuracy of precision electronic components. For this reason, complex hardware and software systems are required to process their output signals, which not only increases the weight and cost of the system, but also reduces the reliability of the system. Therefore, it is urgent to develop a sound-absorbing material with high-efficiency sound-absorbing effect. It is well known that porous sound-absorbing materials have high sound absorption coefficients for medium and high frequencies, but low sound absorption coefficients for low frequencies. At present, common porous sound-absorbing materials mainly include fiber sound-absorbing materials, foam sound-absorbing materials and granular sound-absorbing materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C47/14
Inventor 王建忠敖庆波马军支浩许忠国李爱君汤慧萍
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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