Sound-absorbing structure of porous foam silicon carbide sound-absorbing material

A foamed silicon carbide and porous silicon carbide technology, which is applied to sound-producing instruments, instruments, etc., can solve the problems of poor sound-absorbing effect of porous materials, and achieve the effects of improving sound-absorbing performance, improving low-frequency sound-absorbing effect, and good sound-absorbing performance.

Inactive Publication Date: 2015-09-02
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a sound-absorbing structure of a porous silicon carbide sound-absorbing material, thereby improving the sound-absorbing performance in the low-frequency range, and solving the problem of poor sound-absorbing effect of porous materials in the low-frequency range

Method used

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  • Sound-absorbing structure of porous foam silicon carbide sound-absorbing material
  • Sound-absorbing structure of porous foam silicon carbide sound-absorbing material
  • Sound-absorbing structure of porous foam silicon carbide sound-absorbing material

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Embodiment 1

[0029] Such as figure 1 As shown, two or more layers of foamed silicon carbide 5 with different porosity, pore size, and thickness are the same or different for bonding combination (three layers in this embodiment) to form a sound-absorbing structure of porous foamed silicon carbide sound-absorbing material.

[0030] The porous silicon carbide foam used in the sound-absorbing structure has a pore structure of a three-dimensional interconnected foam structure with a pore size between 0.3 mm and 5 mm and a porosity between 70 and 90%.

Embodiment 2

[0032] Such as figure 2 As shown, taking advantage of the machinable characteristics of foamed silicon carbide materials, the structure of sound-absorbing wedge 1 is superimposed on the base 2 of foamed silicon carbide 5, and the base 2 and wedge 1 are bonded and compounded to form a porous foamed silicon carbide sound-absorbing material sound-absorbing structure. Wherein, the height of the wedges 1 is less than 50mm, and the wedges 1 are arranged in parallel.

[0033] The porous silicon carbide foam used in the sound-absorbing structure has a pore structure of a three-dimensional interconnected foam structure with a pore size between 0.3 mm and 5 mm and a porosity between 70 and 90%.

Embodiment 3

[0035] Such as image 3 As shown, taking advantage of the machinable characteristics of foamed silicon carbide material, the perforation 3 can be processed on the base 2 of the foamed silicon carbide 5, and the structure of the sound-absorbing wedge 1 is superimposed on the base 2 of the foamed silicon carbide, and the base 2 and the wedge 1 Bonding and compounding to form a sound-absorbing structure of porous foam silicon carbide sound-absorbing materials. Wherein, the hole diameter of the perforation is less than 10mm, the height of the wedges 1 is less than 50mm, the wedges 1 are arranged in parallel, and the bottom of the wedges 1 is provided with a wedge-shaped hole 4 to form a hollow structure. The wedge-shaped hole 4 corresponds to the perforation 3 of the base 2 , and the size of the wedge-shaped hole 4 and the perforation 3 correspond to each other.

[0036] The porous silicon carbide foam used in the sound-absorbing structure has a pore structure of a three-dimensio...

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Abstract

The invention belongs to the field of noise control, and specifically discloses a sound-absorbing structure of porous foam silicon carbide sound-absorbing material. In the invention, further improvements have been made on the prepared foam silicon carbide substrate which include (1) using a combination of three-dimensional communication foam silicon carbide material of single or various specification parameters as sound-absorbing material; and (2) the sound-absorbing structure using foam silicon carbide material of a punching and wedge spacing structure or a stacked structure to constitute a composite sound-absorbing structure having a sound-absorbing material layer of different specific acoustic impedance. Through the above design, the sound-absorbing foam silicon carbide material has significantly improved low-frequency sound-absorbing effects and more excellent sound-absorbing performance in other frequency bands.

Description

technical field [0001] The invention belongs to the field of noise control, in particular to a sound-absorbing structure of a porous foam silicon carbide sound-absorbing material. Background technique [0002] Foamed silicon carbide has a unique pore structure and permeability, and its pores are connected to each other, with good isotropy and good sound absorption performance. At the same time, compared with traditional porous materials (such as fiber materials and organic polymer porous materials), silicon carbide foam ceramics also have other excellent properties such as heat resistance, shock resistance, and corrosion resistance. Foamed ceramic materials have now been used in high-rise buildings, tunnels, subways and other places with high fire protection requirements, as well as in places with high sound insulation requirements such as TV launch centers and theaters, and have achieved good results. With the support of the national "Eleventh Five-Year Plan" and "863" pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/162
Inventor 张劲松许卫刚姜春海
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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