JPH0799480B2 - Multi-layer sound deadening material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer material in which a coating having fine pores made of ceramic powder is formed on a surface of an aluminum base material by a plasma spraying method, and a multi-layered aluminum base material provided with a multiplicity of perforations is bonded to the base material. The present invention relates to a multilayer sound deadening material having high sound deadening characteristics over a wide frequency band from a high frequency to a high frequency.

[0002]

2. Description of the Related Art As a sound deadening material or soundproofing material that blocks sound waves, it is necessary to be lightweight, robust and corrosion resistant. In the past, as a sound deadening material or sound absorbing material, a porous material such as an inorganic fiber such as glass wool or polyurethane foam was used in the past, but glass wool is easily broken by vibration or wind pressure, and is easily dusted, and rainwater and other There is a problem that absorption of moisture in the atmosphere reduces sound absorption. In addition, there is a problem that a porous body such as polyurethane foam has poor heat resistance and its sound absorbing property is lowered due to moisture absorption.

On the other hand, recently, as a soundproof wall of a motorway, a soundproof wall of a structure such as a factory, and a vibration-proof purpose, as described above, the sound deadening material or the sound deadening material is required to be lightweight, robust and corrosion resistant. Aluminum has attracted attention as a material and has been used.

[0004]

When an aluminum material is used as a sound deadening material to muffle sound waves in a wide frequency band from a short wavelength to a long wavelength, it is possible to stack many kinds of aluminum materials having different hole diameters. is necessary. However, there is a processing problem in forming fine holes for absorbing sound waves of short wavelength in the aluminum material.

[0005]

As a result of studies in view of the above, the present invention has resulted in a multi-layer sound deadening material capable of deadening sound waves in a wide frequency band from a short wavelength to a long wavelength.

That is, according to the present invention, aluminum having a large number of perforations is formed on a multi-layered material in which ceramic powder is sprayed on the surface of an aluminum base material by plasma spraying to form a ceramic film having fine pores integrally bonded to the aluminum material. A sound deadening material obtained by joining materials in multiple layers, or a sound deadening material in which silicone oil is further injected into the joining layer.

[0007]

The sound deadening material of the present invention is constructed as described above, and in a multi-layer material in which a ceramic coating is formed on the surface of an aluminum substrate by plasma spraying, the ceramic coating has a diameter equal to that of the ceramic powder to be used. Depending on 5
It has a large number of micropores of 20 μm. Further, the aluminum base material having a large number of perforations means a perforation hole having a diameter of 1 to 10 mmφ. When such a sound deadening material is used for a soundproof wall or the like, of the incident sound waves, those of short wavelength are absorbed by the ceramic coating layer having fine pores of 5 to 20 μm, and long wavelength of sound waves of 1 to 10 mmφ. Are absorbed by the aluminum substrate.

The multi-layer material having a ceramic film formed on the surface of the aluminum base material and the aluminum base material having a large number of perforations are joined by welding. The sound deadening material of the present invention is intended to be used as a soundproof wall for roads, sound absorbing wall material for buildings such as factories, in which a multi-layered material having a ceramic film and a single aluminum base material having a large number of perforations are joined. Accordingly, a plurality of sheets may be laminated and used. In this case, as the ceramic film in the multi-layered material, the multi-layered material formed by adjusting the particle size of the ceramic powder to be plasma-sprayed to form the ceramic film having fine pores with various diameters within the range of 5 to 20 μm is used. It should be manufactured. Also, for an aluminum base material having a large number of holes, holes having different diameters may be individually formed in the aluminum base material within a range of 1 to 10 mmφ,
It is also possible to make holes of several different diameters in a single aluminum substrate.

As the ceramic powder, Al ₂ O ₃ ,
Metal oxides such as Fe ₂ O ₃ and SiO ₂ , AlN and Si
A metal nitride such as ₃ N ₄ is used.

[0010]

The present invention will now be described in detail with reference to examples. FIG. 1 is a sectional view showing an example of an induction plasma spraying apparatus used to obtain a multilayer material in which a ceramic powder is plasma sprayed on an aluminum base material to form a ceramic coating in the present invention. This device comprises a triple structure torch consisting of an outer tube 1 made of transparent quartz or boron nitride, an intermediate tube 2, and a carrier gas introduction tube 3, and a water-cooled induction coil 4 provided on the outer periphery of the opening below the torch.

The outer pipe 1 is closed at the lower end and the upper end is joined to the upper outer periphery of the intermediate pipe 2, and the outer gas supply passage 5 is tangentially opened inside the upper end.
The lower end of the intermediate pipe 2 is located above the lower end of the outer pipe 1,
The outer diameter of the lower end portion is enlarged, and an annular small gap 6 of about 1 mm is formed between the inner peripheral surface of the outer tube 1 and the inner peripheral surface of the outer tube 1 in order to increase the gas velocity and improve cooling efficiency. It is closed by being connected to the outer periphery of the upper portion of the gas introduction pipe 3, and an intermediate gas supply passage 7 is tangentially opened in the upper end portion thereof along the same circumferential direction as the outer gas supply passage 5.

The carrier gas introducing pipe 3 has a lower end opening near the lower end in the intermediate pipe 2, and an upper end serving as a carrier gas supply passage 8. 9 has a temperature of 2000 to 300
The plasma flame reaches 0 ° C., and 10 is an aluminum substrate provided below the plasma flame 9 and having a melting point of 660 ° C. and a plate thickness of 0.2 to 0.5 mm.

In this apparatus, in order to cool the outer tube 1 from the high temperature due to the plasma flame 9, argon or nitrogen gas as the outer gas (sheath gas) 2 is supplied from the outer gas supply passage 5.
Argon gas is supplied at 0 liters / minute, argon gas is supplied at 5 liters / minute as an intermediate gas (plasma gas) from the intermediate gas supply path 7, and 2 liters / minute is supplied as a carrier gas from the carrier gas supply path 8. Is supplied to operate the induction coil 4.

Since the outer gas is introduced into the outer tube 1 tangentially from the outer gas supply passage 5, it flows out while rotating in a spiral shape. When the plasma flame 9 is generated in a state where the carrier gas is not flowed, it becomes a flat frame shape, but when the carrier gas is flowed and the flow rate is increased, the center of the plasma flame 9 becomes concave. At this time, when alumina powder having a particle size of 5 to 50 μm was introduced into the carrier gas supply path at a rate of 2 g / min as the ceramic powder, the alumina powder was melted by the plasma flame 9 and the alumina powder was provided below the plasma flame 9.
A coating 11 having a large number of fine holes of 5 to 20 μm with a thickness of 10 μm to 300 μm is sprayed on the aluminum substrate 10 of 00 mm square, 600 mm long and 0.2 to 0.5 mm thick by the force of carrier gas. The multi-layered material 12 is obtained by being formed.
The spraying time is 2 to 20 minutes. The aluminum substrate 10 can be formed into a uniform film by moving it left and right at 50 to 400 mm / min during thermal spraying.

An aluminum substrate 13 in which a multi-layered material 12 thus obtained is provided with a large number of perforations 14 as shown in FIG.
The sound deadening material of the present invention is obtained by welding.
FIG. 3A shows an aluminum base material 13 provided with a large number of holes 14 of the same diameter, but in addition to this, several columns and / or rows of holes are provided like the aluminum base material 13a of FIG. 3B. The holes 14a having different diameters can be used.

FIG. 2 shows a multi-layer sound deadening material obtained by further laminating and welding the sound deadening materials A and B in which the aluminum base materials 13 and 13a having holes of different diameters are laminated and welded to the multi-layer materials 12 and 12a, respectively. is there. In such a sound deadening material, if the micropore diameters of the microporous ceramic coatings 11 and 11a are made different from each other, sound waves of different short wavelengths will be generated at these 11 and 1a.
The aluminum substrate 13 having holes with different diameters, which are absorbed by the microporous ceramic film layer of
Since it is absorbed by 13a, it can exert a great effect as a sound deadening material.

In the case of the sound deadening material having the above structure, there is a possibility that it will be corroded by the external atmosphere depending on its application. The surface of the sound deadening material can be anti-corrosion processed by alumite treatment, etc.
Internal corrosion may occur during long-term use, and the purpose as a sound deadening material may not be achieved. However, such corrosion can be prevented in the sound deadening material of the present invention by injecting silicone oil into the bonding layer. This is because the injected silicone oil seals the inside of the sound deadening material and prevents corrosion due to the external atmosphere. In addition, even if silicone oil is injected, the voids are held by the microballoons of 1 to 10 μm contained in the silicone oil, so there is no effect on the sound deadening effect.

That is, as shown in FIG. 4, a multi-layer material 2 in which a microporous ceramic film layer 21 is formed on an aluminum base material 20.
2. A sound deadening C made by welding an aluminum base material 13 having a hole 14 having the same diameter as that of No. 2 and a multilayer material 22a having a microporous ceramic coating layer 21a formed on an aluminum base material 20a and a hole 1
4. A frame 23 made of synthetic rubber such as ethylene-propylene rubber or ethylene-propylene terpolymer is attached to the periphery of a multilayer sound deadening material obtained by stacking and welding a sound deadening material D formed by welding an aluminum base material 13a on which 4 and 14a are formed. As shown in FIG. 5, by inserting the injection cylinder port 25 into the injection port 24 provided on the upper part, injecting silicone oil into the sound deadening material from the cylinder port 25, removing the injection cylinder port, and then heat-sealing the injection port 24, Good.

As the multi-layer sound deadening material of the present invention, among the sound deadening materials C and D constituting the multi-layer sound deadening material of FIG. 4, instead of the sound deadening material D, the back surface side of the aluminum base material of the multi-layer material 22a. Various configurations are possible depending on the application, such as the configuration shown in FIG. 6 using the sound deadening material E in which the aluminum base material of 13a is laminated.

The thus obtained multi-layer sound deadening material of the present invention is particularly useful as a sound deadening or vibration isolating material for soundproof walls such as railways and motorways, sound absorbing walls for buildings such as factories.

[0021]

As described above, according to the present invention, by combining a multi-layer material having a microporous ceramic coating formed on the surface of an aluminum substrate by plasma spraying with an aluminum substrate having a large number of holes, or In addition, by injecting silicone oil, a multi-layer sound deadening material is constructed, which shows high sound deadening efficiency in a wide frequency band from low frequency to high frequency, and corrosion resistance even in long-term use. Has the advantage of having.

[Brief description of drawings]

FIG. 1 is a sectional view of an induction plasma spraying apparatus used in the present invention.

FIG. 2 is a cross-sectional view showing an example of the structure of the multilayer sound deadening material of the present invention.

3A and 3B are plan views of an aluminum substrate having a large number of holes.

FIG. 4 is a cross-sectional view showing another example of the structure of the multilayer sound deadening material of the present invention.

FIG. 5 is a perspective view showing a silicone oil injection cylinder port for a multilayer sound deadening material according to the present invention.

FIG. 6 is a sectional view showing still another example of the structure of the multilayer sound deadening material of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Aluminum base material 10a Aluminum base material 11 Microporous ceramic film 11a Microporous ceramic film 12 Multilayer material 12a Multilayer material 13 Aluminum base material 13a Aluminum base material 14 Perforated 14a Perforated 20 Aluminum base material 21 Microporous ceramic film 22 Multilayer Material 23 Frame 24 Inlet 25 Inlet cylinder port

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location E01F 8/00 8/02 E04B 1/86 DG10K 11/16 E01F 8/00 (72) Inventor Emilio Fujiwara 2-14-3 Awaji, Higashiyodogawa-ku, Osaka-shi, Osaka Prefecture Sansha Electric Manufacturing Co., Ltd. (72) Inventor Hiroyasu Murata 2-3-14, Awaji, Higashi-yodogawa-ku, Osaka City, Osaka Prefecture Sansha Electric Manufacturing Co., Ltd. ( 72) Inventor Hidehisa Tachibana 2-14-3 Awaji, Higashiyodogawa-ku, Osaka City, Osaka Prefecture Sansha Electric Manufacturing Co., Ltd. (56) Reference JP-A-62-225339 (JP, A)

Claims (2)

[Claims] 1. A multi-layered material comprising a multi-layered material in which a coating having fine pores made of ceramic powder is formed on the surface of an aluminum base material by plasma spraying, and an aluminum base material having a large number of perforations is multi-layered. Silencer. 2. A multi-layered material in which a coating having fine pores made of ceramic powder is formed by plasma spraying on the surface of an aluminum base material and an aluminum base material having a large number of perforations are multilayer-bonded, and then silicone is bonded in the bonding layer. A multi-layer sound deadening material characterized by being filled with oil.