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Method for increasing sound absorption coefficient of FeCrAl fibrous porous material

A technology of porous materials and sound absorption coefficient, applied in the field of porous sound absorption materials, can solve the problems of difficulty in improving low-frequency sound absorption coefficient, large limitations, and difficult application, etc., achieve simple preparation method, improve sound absorption coefficient, and expand application range Effect

Active Publication Date: 2015-06-10
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

But this method has great limitations, for example, it is difficult to improve the low-frequency sound absorption coefficient and it is difficult to apply in thinner spaces, etc.

Method used

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  • Method for increasing sound absorption coefficient of FeCrAl fibrous porous material
  • Method for increasing sound absorption coefficient of FeCrAl fibrous porous material
  • Method for increasing sound absorption coefficient of FeCrAl fibrous porous material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Clean the FeCrAl fibrous porous material with a fiber diameter of Φ6 μm, a porosity of 95%, and a thickness of 30 mm, and then soak it in an aqueous NaOH solution with a concentration of 1.0 mol / L for 1 hour, take it out, wash and dry it, and obtain The sound absorption coefficient is 0.3 higher than that before soaking, and the FeCrAl fiber porous material has clusters of feather-like protrusions with a thickness of 2 μm to 5 μm and a width of no more than 100 nm on the surface.

[0021] The sound absorption performance test and SEM analysis were performed on the FeCrAl fiber porous material treated in this embodiment. From figure 1 It can be seen that the sound absorption coefficient of the sample is generally increased, and it is increased by 0.3 at 4000Hz. figure 2 Shown is the microscopic morphology of the fiber surface, with a typical clustered feather-like protrusion structure.

Embodiment 2

[0023] Clean the FeCrAl fibrous porous material with a fiber diameter of 20 μm, a porosity of 85%, and a thickness of 10 mm, and then soak it in an aqueous NaOH solution with a concentration of 0.5 mol / L for 5 hours, take it out, wash and dry it, and obtain The sound absorption coefficient is 0.4 higher than that before soaking, and the FeCrAl fiber porous material has clusters of feather-like protrusions with a thickness of 2 μm to 5 μm and a width of no more than 100 nm on the surface.

[0024] The sound absorption performance test and SEM analysis were performed on the FeCrAl fiber porous material treated in this embodiment. From image 3 It can be seen that the sound absorption coefficient of the sample is generally increased, and it is increased by 0.4 at 1000Hz. Figure 4 Shown is the microscopic morphology of the fiber surface, with a typical clustered feather-like protrusion structure.

Embodiment 3

[0026] Clean the FeCrAl fibrous porous material with a fiber diameter of Φ40μm, a porosity of 80%, and a thickness of 3mm, and then soak it in an aqueous NaOH solution with a concentration of 0.1mol / L for 10h, take it out, wash and dry it, and obtain The sound absorption coefficient is 0.2 higher than that before soaking, and the FeCrAl fiber porous material has clusters of feather-like protrusions with a thickness of 2 μm to 5 μm and a width of no more than 100 nm on the surface.

[0027] SEM analysis was performed on the FeCrAl fibrous porous material treated in this embodiment. Figure 5 Shown is the microscopic morphology of the fiber surface, with a typical clustered feather-like protrusion structure.

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Abstract

The invention discloses a method for increasing the sound absorption coefficient of a FeCrAl fibrous porous material. The method comprises the steps of soaking a cleaned FeCrAl fibrous porous material in a NaOH aqueous solution with the concentration of 0.1-1.0 mol / L for 1-10 h, and cleaning and drying the FeCrAl fibrous porous material after the FeCrAl fibrous porous material is taken out, thereby obtaining the FeCrAl fibrous porous material with the sound absorption coefficient which is increased by 0.2-0.4 compared with that of the unsoaked FeCrAl fibrous porous material. The method disclosed by the invention is simple, and the concrete features of the surface microstructure of fibers can be controlled through adjusting preparation processes. According to the method, starting from changing the surface microstructure of the fibers, NaOH is adopted to corrode the FeCrAl fibrous porous material, and a clustered feathery protrusion structure is formed on the surface of the fibers, so that the sound absorption coefficient of the FeCrAl fibrous porous material in a full-frequency range can be increased effectively and is not restricted to the thickness of samples, and then, the application range of the FeCrAl fibrous porous material is enlarged.

Description

technical field [0001] The invention belongs to the technical field of porous sound-absorbing materials, and in particular relates to a method for improving the sound-absorbing coefficient of FeCrAl fiber porous materials. Background technique [0002] FeCrAl fiber porous material can meet the needs of sound absorption and noise reduction in extreme environments due to its advantages of high strength, moisture resistance, high temperature resistance, not easy to deform, and controllable pore structure. For example, Boeing uses FeCrAl fiber porous material for aircraft engines Noise reduction has achieved remarkable results. In the field of submarine noise reduction, FeCrAl fiber porous materials also have obvious advantages. [0003] In order to improve the sound-absorbing performance of FeCrAl fiber porous materials, researchers tried to adjust the macroscopic structural parameters of materials such as porosity gradient structure, and achieved certain results. But this met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08B22F1/00C23F1/32
Inventor 马军李广忠敖庆波王建忠支浩石英
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH