JPH02236264A - Soundproofing/vibration proofing materials - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a soundproofing/vibration proofing member, and in particular to a soundproofing/vibration proofing member used as a structural material having a predetermined thermal sprayed coating on the surface. The present invention relates to a member having a characteristic thermal spray coating.

This sound-proofing/vibration-proofing member can be applied as a containment vessel for various engines, an indoor/outdoor echo prevention member, etc.

[Conventional technology]

Recently, with the development of industry and the promotion of urbanization, water pollution has increased.
Along with air pollution, noise pollution has become a major social problem. In particular, efforts are being made to improve the noise of Jesotho planes, the engine exhaust noise of automobiles, and the mechanical impact noise of high-speed trains passing over railway bridges, which are typical sources of noise pollution.

Conventionally, as soundproofing measures, the former has been addressed by developing low-noise engines and installing soundproof walls on roads, while the latter has been addressed by installing soundproof walls and vibration prevention plates.

In addition, efforts are currently being made to reduce noise by housing internal combustion engines and other noise sources in containers with soundproofing properties.

As for the materials used for the above-mentioned soundproof walls, it is generally recommended to use materials that have the ability to block the air vibrations that play the role of sound source propagation, absorb them, and prevent resonance. Materials such as laminated fibers, or clad materials made by pasting synthetic resin, rubber, etc. on metal plates, or sandwiching these materials between perforated plates, etc., are used.

[Problem to be solved by the invention]

For example, soundproofing materials mainly composed of glass fiber and foamed resin materials that have traditionally been used as soundproofing walls generally require a large volume, so if they are applied to a storage container for an automobile engine, it is difficult to accommodate the The disadvantage is that the container is large and difficult to accommodate in a limited space.

In addition, since the above-mentioned soundproofing materials generally have an undecorated appearance with little commercial value, they are often decorated with beautiful synthetic mats or metal mesh, which requires a large amount of human labor, making it economically There was also a problem.

In view of the above circumstances, the purpose of the present invention is to focus on thermal spraying technology that can provide easy workability and a wide variety of performance.
This method attempts to fundamentally solve the drawbacks of conventional soundproofing materials by simply forming a film with excellent soundproofing and vibrationproofing properties on the surface of a base material.

[Means to solve the problem]

The basic idea of the present invention is to actively utilize pores, which are considered a drawback of thermal spray coatings, for soundproofing and vibrationproofing effects. In other words, the present invention makes use of the pores within the film that are inevitably generated by thermal spraying, and by making use of these pores, which are generally considered a drawback, the more pores there are, the more the air that is the source of noise is reduced. It is characterized by its ability to absorb vibrations well.

Further, in the present invention, the thermal sprayed coating is immersed in an electroplating solution or a chemical plating solution, and the ions in each solution penetrate into the pores of the porous sprayed coating, where they are discharged and deposited as metal. suggest something.

That is, in the present invention, the surface of the base material of metal or ceramic socks has a porosity of 0.3% to
A sound-proofing/vibration-proofing member characterized by being provided with a single-layer or laminated thermal sprayed coating made of metal, oxide ceramics, or cermet with a thickness of 0.03 mm to 10 mm within the range of 20%, or A single-layer or laminated thermal spray coating made of metal, oxide ceramics, or cermet with a thickness of 0.03 InII1 to 10III1 with a porosity within the range of 0.3% to 20% is applied to the surface of a metal or ceramic base material. and inside the pores,
The gist of the invention is a soundproofing/vibration-proofing member characterized by having a composite film filled with a vibration-absorbing metal formed by electroplating or chemical plating.

As the filling metal, a vibration-absorbing metal such as lead, tin, or lead-tin alloy is used, and the composite sprayed coating that is filled by including and precipitating this into the pores exhibits high soundproofing and vibrationproofing functions. Although vibration-absorbing metals such as nickel, zinc, chromium, and copper are particularly preferred, other vibration-absorbing metals are also effective.

In the present invention, the spray coating has a thickness of 0.03 mm to 10 mm.
As mentioned above, this may be two or more layers, preferably a metal material as the lower layer and a ceramic material as the upper layer, or a single layer thereof, or a single layer of cermet. It's okay.

Furthermore, it may be a single layer or a laminated material made of the same or different types of oxide ceramics.

C action] As is well known, general thermal spray coatings are made by introducing thermal spray powder material into a gas combustion flame or plasma environment in the atmosphere to melt it and then spraying it onto the surface of the object to be treated. It is a film formed into a film, and can be said to have a laminate structure of almost fine particles. When metal is used as a thermal spray material for thermal spraying, if the thermal spraying is performed in the atmosphere, the surface of the particles will be oxidized during the melting process. Therefore, the sprayed laminated particles do not fuse with each other, which is one of the causes of pores in the sprayed coating.

In addition, various ceramic materials such as A
IzOz, ZrOz, ZrSiO,, Cr. 0. When oxides such as There was a risk that cracks and pores would occur in the particles due to temperature differences in the field and stress during solidification.

The occurrence rate of these pores depends on the thermal spraying material, thermal spraying equipment, thermal spraying conditions (
(including thermal spraying atmosphere), etc., but generally 0.
It is thought to be in the range of 1 to 20%.

As explained above, when a thermal sprayed coating with many pores is used as a soundproofing material, the pores in the thermal sprayed coating absorb all vibrations, not only from air vibrations that are the sound source, but also from sound sources propagated by solid vibrations. It exhibits a soundproofing function because it is attenuated (sound waves are diffusely reflected within the pores and are difficult to escape outside the film).

Furthermore, lead is removed by plating into the pores of the thermal spray coating.
When solder or the like of tin or its alloys is impregnated and then deposited, these metals have a large vibration damping effect, so they function as a soundproofing/vibration proofing film.

Thermal sprayed coatings formed by impregnating and depositing metal into the pores in this way form heterogeneous layers at the boundary between the thermally sprayed coating and the steel plate, and the boundary between the thermally sprayed material and the plated metal in the thermally sprayed coating. The effect of absorbing vibrations is particularly strong at the boundary portion, and it has the soundproofing and vibrationproofing effects aimed at by the present invention.

Further, by impregnating and depositing a metal in a porous thermal sprayed coating, there is an advantage that the bonding strength of the coating is improved and the impact resistance is improved, and desirable functions as a structure are added.

The range of porosity of the thermal spray coating used for the purpose of the present invention is 0.
．． The reason why it was decided to be 3 to 20% is that it is difficult to economically process a film with a porosity of 0.3% or less, and
This is because the sound absorption and vibration distribution effects obtained by the presence of pores are eliminated. In addition, if 0.3% or more of pores exist,
This is convenient for filling the pores with metal by electroplating or chemical plating to fully exhibit its effects.

On the other hand, the upper limit of the porosity was set at 20% because if the porosity is higher than this, the adhesion area of the sprayed coating to the object to be treated will decrease and the adhesion will become weaker, and the mutual bonding force of the sprayed particles that make up the coating will also decrease. This is because it simultaneously decreases and becomes easier to peel off from the object to be processed during use.

In addition, the pore size of the thermal spray coating is 0.001 to 0.0
Usually, the pores are distributed in a range of 3 fl, but sometimes large pores of around 1 fl are scattered. However, even if such large pores exist, the purpose of the present invention can be achieved as long as the adhesion of the thermal spray coating to the object to be treated is not inhibited. Therefore, in the present invention, the size of the pores is not particularly limited. do not.

The thickness of the sprayed coating can be controlled by controlling the spraying conditions and spraying time, but in order to achieve the purpose of the present invention,
A minimum of 0.0311 is required. Further, the upper limit is not particularly limited as long as the adhesion of the film is not impaired, but from an economic standpoint, about 10 mm is considered to be the maximum practical thickness.

If water plasma spraying is applied, the ceramic spraying material can be sprayed into a 10 to 30 mm thick film, and although this film can also be used in the present invention, it is not economical.

Regarding the type of lamination of the thermal spray coating of the present invention, it is generally appropriate to spray a metal material as the lower layer (undercoat) with the main purpose of adhesion, and a ceramic material as the upper layer (tosobu coat). However, the purpose can be sufficiently achieved even if the metal sprayed layer and the ceramic sprayed layer are sprayed alone, and a sprayed coating made of a so-called cermet material, which is a mixture of both materials, can also be used.

The amount of vibration-absorbing metal to be filled into the thermal spray coating should be determined in relation to the porosity of the coating used, and the upper limit is complete filling of the coating with a porosity of 20%.

In the same sense, the lower limit amount is the amount filled into a film with a porosity of 0.3%. However, since some of the pores in the film are completely independent and isolated from the outside, it is impossible to fill these isolated pores with a vibration-absorbing metal. Therefore, the filling amount of the vibration-absorbing metal of the present invention is limited to the pores of the film into which the plating solution can penetrate. According to the experimental results, more than 90% of the pores can be filled with metal, so this level of filling amount is sufficient to achieve the object of the present invention.

〔Example〕

Example 1 In this example, two layers of oxide ceramic ceramics (2) below were thermally sprayed on a steel plate, and the soundproofing and vibrationproofing effects thereof were investigated.

(11 Test plate: General structural steel plate (5S41) Dimensions Width 200 x 200 x Thickness 3.2 mm (2) Thermal spraying materials: Upper layer (top) material Al.0., ZrSiO. ZrOz Lower layer (undercoat) material Ni- Cr (80/20 wt%) (3) Spraying thickness
: For 1 layer: 0.3 mm2N<upper layer+lower N): 0.3 mm + 0. 15 mm (4) Thermal spraying method: Atmospheric plasma spraying for both upper and lower layers (5) Comparative example: The test field board was used without treatment (on both sides).

(6) Evaluation method The coating of the present invention was produced using the apparatus shown in FIG.

In the figure, I is v:. It is a test steel plate with two thermal spray coatings on one side.
is formed. On the other hand, a rope ball 5 (diameter 20
．． 5 mm, mass 36.5 g), and the collision speed and strength of the steel ball against the steel plate can be changed by the swing-up angle θ from the center point.

The steel ball always collides with the center point of the steel plate without the sprayed coating, but a vibration detection element 6 is installed on the opposite side of the sprayed coating.
A vibration meter 7 detects vibrations caused by the collision, and a recorder 8 automatically processes the vibrations.

In addition, the collision sound was measured using a sound collector 9 set at a position of 200 vx from the test steel plate, and the sound pressure level. Sound pressure level meter 10 measures sound pressure waveform, decay time, frequency spectrum, etc.
It is possible to automatically record on recorder 8 via .

The above-mentioned apparatus is installed in an anechoic chamber, and the test is carried out in an environment where the influence of so-called surrounding noise is removed.

{7} Test Results Table 1 shows the results of measuring the acoustic ratio and vibration ratio of the sprayed coating using the above-mentioned evaluation method.

As is clear from the results, the steel plate on which the sprayed coating was formed exhibited excellent performance, with both small acoustic g values and low vibration values. The reason for this is thought to be that the vibrations propagating through the steel plate are weakened at the bonding interface between the sprayed coating and the steel plate, and the vibrations are greatly attenuated when propagating through the porous sprayed coating. Note that the measurements in this test were compared based on the sound and vibration of an untreated steel plate, and both measured values were expressed as B/A=C. Here, A is the measured value of the untreated steel sheet, B is the measured value of the spray-coated throat plate, and C is the measured ratio.

Example 2 In this example, the acoustic ratio was measured in the same manner as in Example 1 for a composite coating formed by applying electroplating and chemical plating (electroless plating) into the pores of a thermal spray coating to fill the pores with metal. and the vibration ratio was measured.

(11 Test steel plate: Same as Example 1 (2) Thermal spray material second upper layer (top) material Al20z,
ZrSiO4 Lower layer (undercoat) material Ni-Cr (80/201%) (3) Thermal spraying thickness: Same as Example 1 (4) Thermal spraying method: Same as Example 1 (5) Plating treatment after thermal spraying: Commercially available plating Plating was carried out for 10 minutes using chemicals.

Thereafter, the plating film formed on the thermal sprayed film was removed using emery paper. Therefore, plating is applied only to the pores of the sprayed coating.

Type of electroplating: Pb, Pb-Sn (alloy).
Sn, Ni, Cu Type of chemical plating: Ni-P (alloy) (6) Comparative example: Table 2, which is the same as Example 1, summarizes the results of Example 2.

As is clear from these results, the composite thermal sprayed coating in which the pores of the thermal sprayed coating were filled with metal by electroplating or chemical plating significantly reduced both sound and vibration. Especially Pb,
This effect is even more pronounced in metals such as Pb-Sn and Sn, which have a large mass and are difficult to propagate vibrations to.

Table 2 [Effects of the Invention] As explained above, the present invention provides a thermal spray coating of porous oxide ceramics on a steel plate, or a composite film in which the pores of the thermal spray coating are filled with metal by electroplating or chemical plating. By forming a thermal spray coating, the vibrations of the sound source passing through the steel plate can be absorbed, so an excellent soundproofing and vibrationproofing material can be provided.

Therefore, the treated steel sheet of the present invention can be used as a soundproofing member for mechanical devices that generate noise, including automobiles, and is also effective as an anti-aging material for voices and musical instruments indoors.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an apparatus in which the effects of the soundproofing and vibrationproofing member of the present invention were tested. DESCRIPTION OF SYMBOLS 1... Test steel plate, 2... Thermal spray coating, 3... Origin of steel ball, 4... Synthetic fiber thread, 5... Steel ball, 6...
Vibration detection element, 7... Vibration meter, 8... Recorder

Claims (1)

[Claims] 1. The surface of the metal or ceramic base material has a porosity of 0.3.
1. A soundproofing/vibration proofing member characterized in that it is provided with a thermally sprayed coating having a thickness of 0.03mm to 10mm, which is in the range of % to 20%. 2. The soundproofing/vibration-proofing member according to claim 1, wherein the thermal spray coating formed on the surface of the base material is a laminated layer of metal and oxide ceramics, a single layer thereof, or a single layer of cermet. 3. The surface of the metal or ceramic base material has a porosity of 0.
A composite coating having a thermal spray coating with a thickness of 0.03 mm to 10 mm in the range of 3% to 20%, and filled with a vibration absorbing metal inside the pores by electroplating or chemical plating. Characteristic soundproofing and vibrationproofing materials. 4. The soundproofing/vibration-proofing member according to claim 3, wherein the thermal spray coating formed on the surface of the base material is a laminated layer of metal and oxide ceramics, a single layer thereof, or a single layer of cermet.