CN105033261B - A kind of preparation method of intermediate frequency sound-absorbing material - Google Patents
A kind of preparation method of intermediate frequency sound-absorbing material Download PDFInfo
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- CN105033261B CN105033261B CN201510530304.3A CN201510530304A CN105033261B CN 105033261 B CN105033261 B CN 105033261B CN 201510530304 A CN201510530304 A CN 201510530304A CN 105033261 B CN105033261 B CN 105033261B
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Abstract
The invention provides a kind of preparation method of intermediate frequency sound-absorbing material, comprise the following steps：First, copper powder and polyvinyl alcohol water solution are well mixed, obtain slurry, slurry is then evenly applied to copper foil upper and lower surface；2nd, multilayer stainless steel fibre porous material is chosen；3rd, the stainless steel fibre porous material of selection is sequentially stacked, and the copper foil for being coated with slurry is plugged between adjacent two layers stainless steel fibre porous material, obtain blank to be sintered；4th, blank to be sintered is mounted in sintering mold, is then placed in sintering furnace and sinters, obtain intermediate frequency sound-absorbing material.The average sound absorption coefficient of intermediate frequency sound-absorbing material prepared by the present invention under conditions of frequency is 700Hz~1000Hz is 0.35~0.5, and sound absorbing capabilities are excellent, can be widely applied to the desired precise electronic component field or other noise elimination places that absorbed sound with intermediate frequency.
Description
Technical field
The invention belongs to sound-absorbing material technical field, and in particular to a kind of preparation method of intermediate frequency sound-absorbing material.
Background technology
There is the hole of connection, porosity reaches as high as 95%, also with many functions inside metal fiber polyporous material
Characteristic, such as anti-oxidant, heat and corrosion resistant, good airflow impact performance, service life length, easy processing, porosity are controllable, it is good both to have had
Good permeability, while having the ability of stable and excellent absorption of noise, has in the particular surroundings such as Aero-Space, national defence
There is the absorption high intensity noise performance that other materials hardly match.Single-layer metal textile porous materials have preferable in high frequency treatment
Sound absorbing capabilities, as the sound absorption peak value of the increase material of thickness is moved to middle low frequency, but the acoustic absorptivity of high frequency treatment has declined.
To improve the sound absorbing capabilities that material can be in all frequency range, using the metal fiber polyporous material with gradient pore, the material
Stable sound absorbing capabilities can be kept in wider frequency band range, but the sound absorbing capabilities at intermediate frequency are still very poor, have in addition
A little requirements of the use environment to material thickness are very strict, only allow to do sqouynd absorption lowering noise processing using the material of grade thickness, this
Just making the sound absorbing capabilities of metal fiber polyporous material can not normally play.How the intermediate frequency sound absorption of metal fiber polyporous material is improved
Performance is always the technical barrier of this area, can not individually be realized by changing the self structure parameter of porous material at present.
The content of the invention
The technical problems to be solved by the invention are that there is provided a kind of intermediate frequency sound absorption material for above-mentioned the deficiencies in the prior art
The preparation method of material.Average sound absorption system of the sound-absorbing material prepared using this method under the conditions of frequency is 700Hz~1000Hz
Number be 0.35~0.5, sound absorbing capabilities are excellent, can be widely applied to intermediate frequency absorb sound require precise electronic component field or
Other noise elimination places.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of preparation method of intermediate frequency sound-absorbing material,
Characterized in that, this method comprises the following steps：
Step 1: copper powder and polyvinyl alcohol water solution are well mixed, slurry is obtained, then uniformly coats the slurry
In the upper and lower surface of copper foil；
Step 2: choosing multilayer stainless steel fibre porous material, the largest hole of every layer of stainless steel fibre porous material
Footpath DmaxDiffer, the DmaxMeet：Wherein d is stainless in stainless steel fibre porous material
The string diameter of steel fibre, ε is the porosity of stainless steel fibre porous material, DmaxUnit with d is μm；
Step 3: by stainless steel fibre porous material selected in step 2 according to DmaxDescending order is successively
Stack, and the copper foil that slurry is coated with step one is plugged between every adjacent two layers stainless steel fibre porous material, then
Stainless steel fibre porous material that is rear and being inserted with copper foil will be stacked to be cropped neat, blank to be sintered is obtained；
Step 4: require to design and make sintering mold according to the shape and size of blank to be sintered described in step 3,
The blank to be sintered is mounted in sintering mold again, is then placed in sintering furnace, in hydrogen atmosphere, temperature is 900 DEG C~
1h~2h is incubated under conditions of 1000 DEG C to be sintered, and sintering mold is removed after furnace cooling, intermediate frequency sound-absorbing material is obtained,
Average sound absorption coefficient of the sound-absorbing material under the conditions of frequency is 700Hz~1000Hz is 0.35~0.5.
The preparation method of above-mentioned a kind of intermediate frequency sound-absorbing material, it is characterised in that the thickness coated described in step one is
50 μm~100 μm.
The preparation method of above-mentioned a kind of intermediate frequency sound-absorbing material, it is characterised in that polyvinyl alcohol is water-soluble described in step one
The mass percent concentration of liquid is 3%~8%.
A kind of preparation method of above-mentioned intermediate frequency sound-absorbing material, it is characterised in that copper powder in slurry described in step one
Weight/mass percentage composition is 10%~30%.
A kind of preparation method of above-mentioned intermediate frequency sound-absorbing material, it is characterised in that the average grain of copper powder described in step one
Spend for 50 μm~100 μm.
The preparation method of above-mentioned a kind of intermediate frequency sound-absorbing material, it is characterised in that the thickness of copper foil described in step one is
0.5mm~1mm.
The preparation method of above-mentioned a kind of intermediate frequency sound-absorbing material, it is characterised in that stainless steel fibre is more described in step 2
The string diameter d of stainless steel fibre is met in Porous materials：50μm≤d≤200μm.
The preparation method of above-mentioned a kind of intermediate frequency sound-absorbing material, it is characterised in that stainless steel fibre is more described in step 2
The porosity ε of Porous materials is met：75%≤ε≤85%.
The preparation method of above-mentioned a kind of intermediate frequency sound-absorbing material, it is characterised in that selected multilayer is stainless in step 2
The number of plies of steel fibre porous material is 3~6 layers, and the thickness of every layer of stainless steel fibre porous material is 1.5mm~10mm.
The present invention has advantages below compared with prior art：
1st, the present invention is first quotes foil and metal fiber polyporous material gradient-structure combined technology, efficiently solves
The shortcoming of porous material intermediate frequency sound absorbing capabilities difference；The present invention is first with different DmaxThe metal fiber polyporous material of micro-structural
Gradient-structure is made, then adds certain thickness copper foil as middle sound wave micro-vibration exhaustion layer, passes through two kinds of different sound absorption machines
The coordinated of reason, and selection to metallic fiber and metal dust and the optimization for stacking technique, finally realize product
Intermediate frequency sound absorbing capabilities are greatly improved.
2nd, not only to remain metal fiber polyporous material sound absorption properties in all frequency range for the sound-absorbing material for preparing of the present invention
Can, and by adding copper foil, more significantly improve the sound absorbing capabilities of material intermediate frequency.
3rd, the present invention designs according to the shape and size of blank to be sintered and has made sintering mold, because sintering mold is pressed
Shape and size according to blank to be sintered are designed and produced so that mutually fitted both when blank to be sintered is sintered in sintering mold
Match somebody with somebody, not only solve offset problem of the multi-layer porous material in sintering process, and ensure that sintering after terminating by material
The side wall of material is without any destruction during taking-up.
4th, use acoustic absorptivity of the sound-absorbing material for preparing of the present invention under the conditions of 700Hz~1000Hz intermediate frequencies for 0.35~
0.5, sound absorbing capabilities are excellent, can be widely applied to the desired precise electronic component field or other noise elimination fields that absorbed sound with intermediate frequency
Institute.
5th, the sound-absorbing material for preparing of the present invention and metallic plate are combined, you can obtain sound insulating material, its with than tradition every
The more excellent sound insulation property of sound material, is more widely applied.
6th, preparation technology of the present invention is simple, workable, it is easy to accomplish industrialized production.
The present invention is described in further detail with reference to the accompanying drawings and examples.
Brief description of the drawings
The structural representation for the blank to be sintered that Fig. 1 is loaded in sintering mold for the present invention.
Description of reference numerals:
1-stainless steel fibre porous material；2-copper foil；3-slurry；
4-sintering mold.
Embodiment
Embodiment 1
The preparation method of the present embodiment intermediate frequency sound-absorbing material comprises the following steps：
Step 1: the polyvinyl alcohol water solution for being 8% with mass percent concentration by the copper powder that particle mean size is 90 μm is mixed
Close uniform, the weight/mass percentage composition for obtaining copper powder in slurry 3, the slurry 3 is 30%, then uniformly coat the slurry 3
In upper and lower surface of the thickness for 1mm copper foil 2, coating thickness is 100 μm；
Step 2: choosing multilayer stainless steel fibre porous material 1, the maximum diameter of hole of every layer of stainless steel fibre porous material 1
DmaxDiffer, the DmaxMeet：Wherein d is stainless in stainless steel fibre porous material 1
The string diameter of steel fibre, ε is the porosity of stainless steel fibre porous material 1, DmaxUnit with d is μm；Selected by the present embodiment
Multilayer stainless steel fibre porous material 1 the number of plies be 3 layers, the performance parameter of each layer stainless steel fibre porous material is shown in Table 1；
The performance parameter of 1 each layer of stainless steel fibre porous material of table
Step 3: by stainless steel fibre porous material 1 selected in step 2 according to DmaxDescending order is successively
Stack (sequencing stacked is 1#, 2#, 3#), and (i.e. 1# and 2# between every adjacent two layers stainless steel fibre porous material 1
Between, between 2# and 3#) copper foil 2 that slurry 3 is coated with step one is plugged, then it will be inserted with after the stacking of copper foil 2
Stainless steel fibre porous material 1 is cropped neat, and obtains blank to be sintered；
Step 4: the shape and size of blank to be sintered according to step 3 design and make sintering mold 4, then will
The blank to be sintered is mounted in sintering mold 4 (structure for the blank to be sintered being loaded in sintering mold 4 is as shown in Figure 1), so
After be put into sintering furnace, in hydrogen atmosphere, temperature is that insulation 2h is sintered under conditions of 1000 DEG C, is taken off after furnace cooling
Except sintering mold 4, intermediate frequency sound-absorbing material is obtained.
According to standard GB/T/T 18696.2-2002《The measurement of acoustic absorptivity and acoustic impedance the 2nd in acoustic impedance pipe
Point：Transfer function method》Measure intermediate frequency sound-absorbing material manufactured in the present embodiment being averaged under the conditions of frequency is 700Hz~1000Hz
Acoustic absorptivity is 0.5, thus proves that the present embodiment institute prepared material has excellent intermediate frequency sound absorbing capabilities.
Embodiment 2
The preparation method of the present embodiment intermediate frequency sound-absorbing material comprises the following steps：
Step 1: the polyvinyl alcohol water solution for being 4% with mass percent concentration by the copper powder that particle mean size is 70 μm is mixed
Close uniform, the weight/mass percentage composition for obtaining copper powder in slurry 3, the slurry 3 is 20%, then uniformly coat the slurry 3
In upper and lower surface of the thickness for 0.8mm copper foil 2, coating thickness is 80 μm；
Step 2: choosing multilayer stainless steel fibre porous material 1, the maximum diameter of hole of every layer of stainless steel fibre porous material 1
DmaxDiffer, the DmaxMeet：Wherein d is stainless in stainless steel fibre porous material 1
The string diameter of steel fibre, ε is the porosity of stainless steel fibre porous material 1, DmaxUnit with d is μm；Selected by the present embodiment
Multilayer stainless steel fibre porous material 1 the number of plies be 4 layers, the performance parameter of each layer stainless steel fibre porous material is shown in Table 2；
The performance parameter of 2 each layers of stainless steel fibre porous material of table
Step 3: by stainless steel fibre porous material 1 selected in step 2 according to DmaxDescending order is successively
Stack (sequencing stacked is 1#, 2#, 3#, 4#), and (the i.e. 1# between every adjacent two layers stainless steel fibre porous material 1
Between 2#, between 2# and 3#, between 3# and 4#) copper foil 2 that slurry 3 is coated with step one is plugged, then it will be inserted with
Stainless steel fibre porous material 1 after the stacking of copper foil 2 is cropped neat, and obtains blank to be sintered；
Step 4: the shape and size of blank to be sintered according to step 3 design and make sintering mold 4, then will
The blank to be sintered is mounted in sintering mold 4 (structure for the blank to be sintered being loaded in sintering mold 4 is as shown in Figure 1), so
After be put into sintering furnace, in hydrogen atmosphere, temperature is that insulation 2h is sintered under conditions of 1000 DEG C, is taken off after furnace cooling
Except sintering mold 4, intermediate frequency sound-absorbing material is obtained.
According to standard GB/T/T 18696.2-2002《The measurement of acoustic absorptivity and acoustic impedance the 2nd in acoustic impedance pipe
Point：Transfer function method》Measure intermediate frequency sound-absorbing material manufactured in the present embodiment being averaged under the conditions of frequency is 700Hz~1000Hz
Acoustic absorptivity is 0.45, thus proves that the present embodiment institute prepared material has excellent intermediate frequency sound absorbing capabilities.
Embodiment 3
The preparation method of the present embodiment intermediate frequency sound-absorbing material comprises the following steps：
Step 1: the polyvinyl alcohol water solution for being 8% with mass percent concentration by the copper powder that particle mean size is 100 μm is mixed
Close uniform, the weight/mass percentage composition for obtaining copper powder in slurry 3, the slurry 3 is 30%, then uniformly coat the slurry 3
In upper and lower surface of the thickness for 1mm copper foil 2, coating thickness is 100 μm；
Step 2: choosing multilayer stainless steel fibre porous material 1, the maximum diameter of hole of every layer of stainless steel fibre porous material 1
DmaxDiffer, the DmaxMeet：Wherein d is stainless in stainless steel fibre porous material 1
The string diameter of steel fibre, ε is the porosity of stainless steel fibre porous material 1, DmaxUnit with d is μm；Selected by the present embodiment
Multilayer stainless steel fibre porous material 1 the number of plies be 4 layers, the performance parameter of each layer stainless steel fibre porous material is shown in Table 3；
The performance parameter of 3 each layers of stainless steel fibre porous material of table
Step 3: by stainless steel fibre porous material 1 selected in step 2 according to DmaxDescending order is successively
Stack (sequencing stacked is 1#, 2#, 3#, 4#), and (the i.e. 1# between every adjacent two layers stainless steel fibre porous material 1
Between 2#, between 2# and 3#, between 3# and 4#) copper foil 2 that slurry 3 is coated with step one is plugged, then it will be inserted with
Stainless steel fibre porous material 1 after the stacking of copper foil 2 is cropped neat, and obtains blank to be sintered；
Step 4: the shape and size of blank to be sintered according to step 3 design and make sintering mold 4, then will
The blank to be sintered is mounted in sintering mold 4 (structure for the blank to be sintered being loaded in sintering mold 4 is as shown in Figure 1), so
After be put into sintering furnace, in hydrogen atmosphere, temperature is that insulation 2h is sintered under conditions of 1000 DEG C, is taken off after furnace cooling
Except sintering mold 4, intermediate frequency sound-absorbing material is obtained.
According to standard GB/T/T 18696.2-2002《The measurement of acoustic absorptivity and acoustic impedance the 2nd in acoustic impedance pipe
Point：Transfer function method》Measure intermediate frequency sound-absorbing material manufactured in the present embodiment being averaged under the conditions of frequency is 700Hz~1000Hz
Acoustic absorptivity is 0.35, thus proves that the present embodiment institute prepared material has excellent intermediate frequency sound absorbing capabilities.
Embodiment 4
The preparation method of the present embodiment intermediate frequency sound-absorbing material comprises the following steps：
Step 1: the polyvinyl alcohol water solution for being 3% with mass percent concentration by the copper powder that particle mean size is 50 μm is mixed
Close uniform, the weight/mass percentage composition for obtaining copper powder in slurry 3, the slurry 3 is 10%, then uniformly coat the slurry 3
In upper and lower surface of the thickness for 0.5mm copper foil 2, coating thickness is 50 μm；
Step 2: choosing multilayer stainless steel fibre porous material 1, the maximum diameter of hole of every layer of stainless steel fibre porous material 1
DmaxDiffer, the DmaxMeet：Wherein d is stainless in stainless steel fibre porous material 1
The string diameter of steel fibre, ε is the porosity of stainless steel fibre porous material 1, DmaxUnit with d is μm；Selected by the present embodiment
Multilayer stainless steel fibre porous material 1 the number of plies be 3 layers, the performance parameter of each layer stainless steel fibre porous material is shown in Table 4；
The performance parameter of 4 each layers of stainless steel fibre porous material of table
Step 3: by stainless steel fibre porous material 1 selected in step 2 according to DmaxDescending order is successively
Stack (sequencing stacked is 1#, 2#, 3#), and (i.e. 1# and 2# between every adjacent two layers stainless steel fibre porous material 1
Between, between 2# and 3#) copper foil 2 that slurry 3 is coated with step one is plugged, then it will be inserted with after the stacking of copper foil 2
Stainless steel fibre porous material 1 is cropped neat, and obtains blank to be sintered；
Step 4: the shape and size of blank to be sintered according to step 3 design and make sintering mold 4, then will
The blank to be sintered is mounted in sintering mold 4 (structure for the blank to be sintered being loaded in sintering mold 4 is as shown in Figure 1), so
After be put into sintering furnace, in hydrogen atmosphere, temperature is that insulation 2h is sintered under conditions of 980 DEG C, is taken off after furnace cooling
Except sintering mold 4, intermediate frequency sound-absorbing material is obtained.
According to standard GB/T/T 18696.2-2002《The measurement of acoustic absorptivity and acoustic impedance the 2nd in acoustic impedance pipe
Point：Transfer function method》Measure intermediate frequency sound-absorbing material manufactured in the present embodiment being averaged under the conditions of frequency is 700Hz~1000Hz
Acoustic absorptivity is 0.38, thus proves that the present embodiment institute prepared material has excellent intermediate frequency sound absorbing capabilities.
Embodiment 5
The preparation method of the present embodiment intermediate frequency sound-absorbing material comprises the following steps：
Step 1: the polyvinyl alcohol water solution for being 5% with mass percent concentration by the copper powder that particle mean size is 80 μm is mixed
Close uniform, the weight/mass percentage composition for obtaining copper powder in slurry 3, the slurry 3 is 15%, then uniformly coat the slurry 3
In upper and lower surface of the thickness for 1mm copper foil 2, coating thickness is 100 μm；
Step 2: choosing multilayer stainless steel fibre porous material 1, the maximum diameter of hole of every layer of stainless steel fibre porous material 1
DmaxDiffer, the DmaxMeet：Wherein d is stainless in stainless steel fibre porous material 1
The string diameter of steel fibre, ε is the porosity of stainless steel fibre porous material 1, DmaxUnit with d is μm；Selected by the present embodiment
Multilayer stainless steel fibre porous material 1 the number of plies be 6 layers, the performance parameter of each layer stainless steel fibre porous material is shown in Table 5；
The performance parameter of 5 each layers of stainless steel fibre porous material of table
Step 3: by stainless steel fibre porous material 1 selected in step 2 according to DmaxDescending order is successively
(sequencing stacked is 1#, 2#, 3#, 4#, 5#, 6#) is stacked, and between every adjacent two layers stainless steel fibre porous material 1
(i.e. between 1# and 2#, between 2# and 3#, between 3# and 4#, between 4# and 5#, between 5# and 6#) is plugged in step one and coated
There is the copper foil 2 of slurry 3, then the stainless steel fibre porous material 1 being inserted with after the stacking of copper foil 2 is cropped neat, treated
Sinter blank；
Step 4: the shape and size of blank to be sintered according to step 3 design and make sintering mold 4, then will
The blank to be sintered is mounted in sintering mold 4 (structure for the blank to be sintered being loaded in sintering mold 4 is as shown in Figure 1), so
After be put into sintering furnace, in hydrogen atmosphere, temperature is that insulation 1h is sintered under conditions of 900 DEG C, is taken off after furnace cooling
Except sintering mold 4, intermediate frequency sound-absorbing material is obtained.
According to standard GB/T/T 18696.2-2002《The measurement of acoustic absorptivity and acoustic impedance the 2nd in acoustic impedance pipe
Point：Transfer function method》Measure intermediate frequency sound-absorbing material manufactured in the present embodiment being averaged under the conditions of frequency is 700Hz~1000Hz
Acoustic absorptivity is 0.5, thus proves that the present embodiment institute prepared material has excellent intermediate frequency sound absorbing capabilities.
It is described above, only it is presently preferred embodiments of the present invention, not the present invention is imposed any restrictions.It is every according to invention skill
Any simple modification, change and equivalence change that art is substantially made to above example, still fall within technical solution of the present invention
Protection domain in.
Claims (7)
1. a kind of preparation method of intermediate frequency sound-absorbing material, it is characterised in that this method comprises the following steps：
Step 1: copper powder and polyvinyl alcohol water solution are well mixed, slurry (3) is obtained, then uniformly applies the slurry (3)
It is overlying on the upper and lower surface of copper foil (2)；The thickness of the copper foil (2) is 0.5mm~1mm；
Step 2: choosing multilayer stainless steel fibre porous material (1), the maximum of every layer of stainless steel fibre porous material (1)
Aperture DmaxDiffer, the DmaxMeet：Wherein d is stainless steel fibre porous material (1)
The string diameter of middle stainless steel fibre, ε is the porosity of stainless steel fibre porous material (1), DmaxUnit with d is μm；It is selected
Multilayer stainless steel fibre porous material (1) the number of plies be 3~6 layers, the thickness of every layer of stainless steel fibre porous material (1)
It is 1.5mm~10mm；
Step 3: by multilayer stainless steel fibre porous material (1) selected in step 2 according to DmaxDescending order according to
It is secondary to stack, and the copper that slurry (3) are coated with step one is plugged between every adjacent two layers stainless steel fibre porous material (1)
Paper tinsel (2), then will stack stainless steel fibre porous material (1) that is rear and being inserted with copper foil (2) and be cropped neat, and obtain base to be sintered
Material；
Step 4: require to design according to the shape and size of blank to be sintered described in step 3 and make sintering mold (4), then
The blank to be sintered is mounted in sintering mold (4), is then placed in sintering furnace, in hydrogen atmosphere, temperature is 900 DEG C~
1h~2h is incubated under conditions of 1000 DEG C to be sintered, sintering mold (4) is removed after furnace cooling, obtains intermediate frequency sound absorption material
Material, average sound absorption coefficient of the sound-absorbing material under the conditions of frequency is 700Hz~1000Hz is 0.35~0.5.
2. the preparation method of a kind of intermediate frequency sound-absorbing material according to claim 1, it is characterised in that applied described in step one
The thickness covered is 50 μm~100 μm.
3. the preparation method of a kind of intermediate frequency sound-absorbing material according to claim 1, it is characterised in that gather described in step one
The mass percent concentration of vinyl alcohol aqueous solution is 3%~8%.
4. the preparation method of a kind of intermediate frequency sound-absorbing material according to claim 1, it is characterised in that starched described in step one
The weight/mass percentage composition for expecting copper powder in (3) is 10%~30%.
5. a kind of preparation method of intermediate frequency sound-absorbing material according to claim 1, it is characterised in that copper described in step one
The particle mean size of powder is 50 μm~100 μm.
6. the preparation method of a kind of intermediate frequency sound-absorbing material according to claim 1, it is characterised in that described in step 2 not
The string diameter d of stainless steel fibre is met in rust steel fibre porous material (1)：50μm≤d≤200μm.
7. the preparation method of a kind of intermediate frequency sound-absorbing material according to claim 1, it is characterised in that described in step 2 not
The porosity ε of rust steel fibre porous material (1) is met：75%≤ε≤85%.
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| CN2540009Y (en) * | 2002-04-22 | 2003-03-12 | 陈正芳 | Metal fiber acoustic board |
| CN1463838A (en) * | 2002-06-10 | 2003-12-31 | 孙愈敏 | Aluminum fiber acoustic board and its making process |
| CN2544926Y (en) * | 2002-06-10 | 2003-04-16 | 孙愈敏 | Sound-absorbing aluminium fiber board structure |
| CN2680755Y (en) * | 2003-12-30 | 2005-02-23 | 北京丰越达工贸有限公司 | Metal fibre sound absorption board |
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| CN101740022A (en) * | 2009-12-18 | 2010-06-16 | 西北有色金属研究院 | Metallic fiber gradient hole sound absorbing material and method for preparing same |
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