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Metallic fiber gradient hole sound absorbing material and method for preparing same

A technology of metal fiber and sound-absorbing materials, which is applied in the direction of sound-emitting devices and instruments, can solve problems such as no binding force, no sound-absorbing effect, sound leakage, etc., and achieve a stable increase in sound absorption coefficient, strong operability, The effect of simple preparation process steps

Inactive Publication Date: 2010-06-16
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no bonding force between the layers of sound-absorbing materials that are stacked together. When sound waves propagate between layers with different pore structures, the superimposed interface does not have any sound-absorbing effect, and even sound leakage occurs.

Method used

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  • Metallic fiber gradient hole sound absorbing material and method for preparing same
  • Metallic fiber gradient hole sound absorbing material and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The metal fiber gradient hole sound-absorbing material prepared in this example is composed of two layers of metal fiber porous material layers stacked together and with different structures. Material. The two metal fiber porous material layers are FeCrAl fiber material, and they are metal fiber porous material layer 1 with a pore diameter of 168 μm and metal fiber porous material layer 2 with a pore diameter of 79 μm. The metal fiber porous material layer 1 and the metal fiber porous material layer 2 are both circular in shape and have an outer diameter of Φ29mm. The metal fiber porous material layer 1 is stacked on the metal fiber porous material layer 2 and the two Sintered into one and form a monolithic sound-absorbing material.

[0040] In this example, when preparing the metal fiber gradient hole sound-absorbing material, the following steps are included:

[0041] Step 1. Lay a single-layer metal fiber felt: select Fe-Cr-Al fibers with a fiber diameter of 20 μm,...

Embodiment 2

[0049] In this example, the difference from Example 1 is that the metal fiber gradient hole sound-absorbing material prepared in this example is composed of three layers of metal fiber porous material layers stacked together with different structures. The metal fiber porous material layer is sintered to form a whole sound-absorbing material. The three metal fiber porous material layers are all stainless steel fiber materials, and they are the metal fiber porous material layer 1 with a porosity of 97%, the metal fiber porous material layer 2 with a porosity of 94%, and the metal fiber porous material layer 2 with a porosity of 91%. Metal fiber porous material layer three. The metal fiber porous material layer 1, the metal fiber porous material layer 2 and the metal fiber porous material layer 3 are all square in shape and have a size of 100mm×100mm, and the metal fiber porous material layer 2 is stacked on the metal fiber porous material On the third layer, the metal fiber por...

Embodiment 3

[0059] In this example, the difference from Example 1 is that the metal fiber gradient hole sound-absorbing material prepared in this example is composed of four layers of metal fiber porous material layers stacked together with different structures. The layers of the fibrous porous material are sintered to form a monolithic sound-absorbing material. The four metal fiber porous material layers are all stainless steel fiber materials and their pore diameters are metal fiber porous material layer 1 of 200 μm, metal fiber porous material layer 2 of 150 μm, metal fiber porous material layer 3 of 100 μm and metal fiber of 50 μm Porous material layer four. The metal fiber porous material layer 1, the metal fiber porous material layer 2, the metal fiber porous material layer 3 and the metal fiber porous material layer 4 are all square in shape and have a size of 170mm×170mm, and the metal fiber porous material layer 3 Then stacked successively on the metal fiber porous material laye...

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Abstract

The invention discloses a metallic fiber gradient hole sound absorbing material and a method for preparing the same. The metallic fiber gradient hole sound absorbing material is formed by multi-layers of metallic fiber porous material layers which are piled, the multi-layers of metallic fiber porous material layers are sintered into a whole, and the pore sizes or porosities of the multi-layers of metallic fiber porous material layers are in gradient arrangement from top to bottom. The preparation method comprises the following steps of: 1, laying the single-layer metallic fiber felt; 2, preparing a plurality of metallic fiber porous material layers; 3, performing low-temperature sintering of the plurality of metallic fiber porous material layers by using a vacuum sintering furnace respectively; 4, performing flattening treatment; 5, piling; and 6, performing low-temperature sintering of the piled metallic fiber porous material layers by using the vacuum sintering furnace. The preparation process is simple and conveniently realized, the used equipment are all the common equipment, the investment cost is low, the operability is strong, the produced metallic fiber gradient hole sound absorbing material has excellent performance, particularly desirable full frequency sound absorbing performance, so that the metallic fiber gradient hole sound absorbing material can be widely used as the sound absorbing lining in the field of noise control.

Description

technical field [0001] The invention belongs to the technical field of sound-absorbing material processing and manufacturing, and in particular relates to a metal fiber gradient hole sound-absorbing material and a preparation method thereof. Background technique [0002] Metal fiber porous materials have been widely valued as a new generation of sound-absorbing materials. Compared with early sound-absorbing materials such as plant fiber sound-absorbing materials and inorganic fiber sound-absorbing materials, metal fiber porous materials have anti-corrosion, moisture-proof, waterproof, heat-resistant, It has the advantages of not easy to age, no pollution, and easy processing, but its main disadvantage is poor low-frequency sound absorption performance. Increasing the thickness of the material, adding an air cavity on the back wall of the material, and reducing the porosity of the material can all improve the effect of low-frequency sound absorption, but at the same time redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/168C22C1/08
Inventor 汤慧萍奚正平敖庆波朱纪磊王建永李程支浩
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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