CN101740020B - Open Al-Cu sound-absorbing material and preparation method thereof - Google Patents
Open Al-Cu sound-absorbing material and preparation method thereof Download PDFInfo
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- CN101740020B CN101740020B CN 200910220255 CN200910220255A CN101740020B CN 101740020 B CN101740020 B CN 101740020B CN 200910220255 CN200910220255 CN 200910220255 CN 200910220255 A CN200910220255 A CN 200910220255A CN 101740020 B CN101740020 B CN 101740020B
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Abstract
The invention discloses open Al-Cu sound-absorbing material and preparation method of the open Al-Cu sound-absorbing material by adopting combustion reaction synthesis method. The problems existing in the traditional material and the preparation method are solved. The open Al-Cu sound-absorbing material comprises the component of an Al-Cu intermetalic compound, holes inside the open Al-Cu sound-absorbing material are mutually linked and penetrated through, the porosity is about 62.5 percent and the sound-absorbing coefficient can reach up to 0.735. The open Al-Cu sound-absorbing material is prepared by adopting a combustion reaction synthesis process and comprising the steps of: uniformly mixing Al powder and Cu powder as powder raw materials, a pore-forming material of NaCl and anhydrous K2CO3; preparing a columnar sample by adopting mould pressing of powder metallurgy; putting a stainless steel container filled with the sample and casting model powder in a high-frequency electromagnetic induction coil for heating and sintering; ultrasonically cleaning after the sample is cooled, and drying; and detecting the sound-absorbing property of the sample. The Al-Cu sound-absorbing material has better sound-absorbing property; and the invention has the advantages of simple process of combustion reaction synthesis, short reaction time, controllable sintering temperature, low cost, high efficiency, energy saving and environment protection.
Description
Technical field
The present invention relates to acoustic absorbant and manufacture method thereof, more particularly, relate to a kind of open Al-Cu sound-absorbing material and preparation method thereof.
Background technology
Energy-saving and environmental protection are fundamental state policies of China, and governments at all levels all pay much attention to problem of noise pollution.To administer then be by adopting acoustic absorbant to reach the effect of noise reduction, that is to say that acoustic absorbant is an indispensable important sport technique segment to effective noise in the practical application.
The advantages such as in the present acoustic absorbant, metal porous acoustic absorbant has that sound absorbing capabilities is good, high strength, high temperature resistant and water-tolerant.Being specially adapted to the sound absorptions such as the sqouynd absorption lowering noise such as outdoor elevated railway road barrier, cooling tower, source pump, unit acoustic hood and indoor swimming pool, gymnasium and decorating, is the focus of studying in recent years.Its sound absorbing mechanism is that porosint inside has countless micropores, connects each other between the space, and communicates with the external world by the surface, and when sound wave incided material surface, a part reflected away at material surface, and another part then penetrates into material internal and propagates forward.In the process of propagating, cause the air movement of hole, rub with the solid grain that forms hole wall, owing to glutinousness and heat-conduction effect, change acoustic energy into heat energy and consume; Secondly, the thermal loss that the heat interchange between the air in the aperture and hole wall and the fiber causes also makes sound energy attenuation; Sound wave is after the reflection of rigidity wall surface of the hole, when getting back to its surface through material, part acoustic wave transmission is in air, a part is reflected back again material internal, sound wave is propagated repeatedly by this, so that energy is constantly changed dissipation, so repeatedly, until balance, the part acoustic energy that made thus material " absorption ".
Nowadays, more typical metal porous acoustic absorbant is aluminium base acoustic absorbant." research of the preparation of foam metal acoustic absorbant and sound absorbing capabilities " literary composition report in 04 phase in 2003 " Chemical Engineer ", this article author Wang Binsheng has introduced take polyurethane foam plastics as base material, utilize electrochemical theory and method, prepare the method for foamed aluminium acoustic absorbant by electroless plating and plating; In addition, be published in " a kind of new method-sintering and dissolution process of the preparation foamed aluminium " literary composition in " world technology research and development-technology physics science " in February, 2003, special report principle and the technique of the sintering and dissolution process that briefly introduces of Zhao Yuyuan, and the tissue signature of made foamed aluminium and mechanical property, and discuss and compare advantage and the limitation that has with other all kinds of existing methods; In addition, " powder sintering prepares the research of Open-cell Aluminum Foam compression performance " literary composition report in 05 phase in 2006 " PM technique ", author Jiang Bin by adding different shape urea and sodium chloride particle as pore creating material, and adopt powder sintering process to prepare Open-cell Aluminum Foam.Comparatively speaking, the experience of comparative maturity has been arranged abroad, large scale investment production.According to " powder metallurgic method prepares a foamed aluminum materials progress " literary composition, the ERG company of the U.S. adopts the foamed aluminium of direct foaming manufacturing to obtain application at space shuttle, and Japan Kobe iron company then adopts the foamed aluminium of seepage flow autofrettage manufacturing to obtain application at bullet train.But aluminium base acoustic absorbant acoustical absorption coefficient still can not satisfy modern requirement.Aluminium base acoustic absorbant preparation method has a variety of, industrial have direct foaming, infiltration casting, bubble method, sintering process, electrochemical plating and a powder metallurgic method, the powder sintering that wherein often adopts, its technological difficulties are that complex process, sintering temperature are high, and cost is expensive.
Summary of the invention
The present invention discloses a kind of open Al-Cu sound-absorbing material and the synthetic preparation method of combustion reaction thereof, further improves the sound absorbing capabilities of existing aluminium base acoustic absorbant and solves the problem that existing preparation technology exists.
In order to solve the problems of the technologies described above, the present invention is on existing Al base acoustic absorbant composition basis, Cu powder and different pore creating material NaCl or anhydrous K 2CO3 have been added, adopt combustion reaction synthetic method technique to prepare the Al-Cu acoustic absorbant, Al-Cu acoustic absorbant inside comprises many Small Holes, and the perforation that interconnects between the aperture, porosity is about 62.5%; The open Al-Cu sound-absorbing material tool is residual without Al, Cu simple substance, is completed into the Al-Cu intermetallic compound, and acoustical absorption coefficient can reach 0.735.
Combustion reaction synthetic method technique is adopted in the preparation of open Al-Cu sound-absorbing material of the present invention:
The purity of raw material A l powder and Cu powder is 99.9%, all is 200 orders;
It is pure that pore creating material NaCl and anhydrous K 2CO3 are analysis, and particle mean size is 10 μ m;
Weighing powder: Cu: Al ≈ 1.57: 1, the volume content of NaCl/ anhydrous K 2CO3 is about 62.5%, powder is mixed again;
Adopt powder metallurgy die forming method to press down the cylindric compact specimen that makes diameter 29mm, thick 20mm at 950MPa pressure;
Sample is put into rustless steel container, and chamber wall thickness is 1mm approximately, fills up the gap with casting model powder, fully compresses the compacting sand;
The rustless steel container that installs sample is put into heat-agglomerating in the high-frequency electromagnetic induction coil, and firing rate is about 100～120 ℃/min, stopped heating after temperature reaches 960 ℃;
Ultrasonic cleaning 1h after the sample cooling, power 1.6KW;
Take out sample, with sample drying;
The sound absorbing capabilities of test samples.
Technical advantage of the present invention is: the Al-Cu acoustic absorbant has good sound-absorbing performance, and acoustical absorption coefficient can reach 0.735; The characteristics such as the combustion reaction synthetic method has that technique is simple, the course of reaction time is short, controllable sintering temperature, with low cost, production efficiency is high, pollute less, energy savings.
Embodiment
Embodiment 1
The purity of raw material A l powder and Cu powder is 99.9%, all is 200 orders;
It is pure that pore creating material NaCl and anhydrous K 2CO3 are analysis, and particle mean size is 10 μ m;
Press Al:24.175g, (Cu: Al ≈ 1.57: 1), NaCl:10.72g proportioning weighing powder mixes powder Cu:38.035g again;
Adopt powder metallurgy die forming method to press down the cylindric compact specimen that makes diameter 29mm, thick 20mm at 950MPa pressure;
Sample is put into rustless steel container, and chamber wall thickness is 1mm approximately, fills up the gap with casting model powder, fully compresses the compacting sand;
The rustless steel container that installs sample is put into heat-agglomerating in the high-frequency electromagnetic induction coil, and firing rate is about 100 ℃/min, stopped heating after temperature reaches 960 ℃;
Ultrasonic cleaning 1h after the sample cooling, power 1.6KW;
Take out sample, with sample drying;
XRD characterizes does not have Al in the sample, Cu simple substance is residual, be completed into the Al-Cu intermetallic compound, and NaCl dissolves fully after the ultrasonic cleaning;
The sound absorbing capabilities of test samples: acoustical absorption coefficient reaches 0.655 on the 6300HZ frequency.
Embodiment 2
The purity of raw material A l powder and Cu powder is 99.9%, all is 200 orders;
It is pure that pore creating material NaCl and anhydrous K 2CO3 are analysis, and particle mean size is 10 μ m;
Press Al:19.34g, (Cu: Al ≈ 1.57: 1), K2CO3:16.042g proportioning weighing powder mixes powder Cu:30.428g again;
Adopt powder metallurgy die forming method to press down the cylindric compact specimen that makes diameter 29mm, thick 20mm at 950MPa pressure;
Sample is put into rustless steel container, and chamber wall thickness is 1mm approximately, fills up the gap with casting model powder, fully compresses the compacting sand;
The rustless steel container that installs sample is put into heat-agglomerating in the high-frequency electromagnetic induction coil, and firing rate is about 110 ℃/min, stopped heating after temperature reaches 960 ℃;
Ultrasonic cleaning 1h after the sample cooling, power 1.6KW;
Take out sample, with sample drying;
XRD characterizes does not have Al in the sample, Cu simple substance is residual, be completed into the Al-Cu intermetallic compound, and K2CO3 dissolves fully after the ultrasonic cleaning;
The sound absorbing capabilities of test samples: acoustical absorption coefficient reaches 0.693 on the 6300HZ frequency.
Embodiment 3
The purity of raw material A l powder and Cu powder is 99.9%, all is 200 orders;
It is pure that pore creating material NaCl and anhydrous K 2CO3 are analysis, and particle mean size is 10 μ m;
Press Al:14.805g, Cu:22.821g (Cu: Al～1.54: 1), K2CO3:20.053g proportioning weighing powder mixes powder again;
Adopt powder metallurgy die forming method to press down the cylindric compact specimen that makes diameter 29mm, thick 20mm at 950MPa pressure;
Sample is put into rustless steel container, and chamber wall thickness is 1mm approximately, fills up the gap with casting model powder, fully compresses the compacting sand;
The rustless steel container that installs sample is put into heat-agglomerating in the high-frequency electromagnetic induction coil, and firing rate is about 120 ℃/min, stopped heating after temperature reaches 960 ℃;
Ultrasonic cleaning 1h after the sample cooling, power 1.6KW;
Take out sample, with sample drying;
XRD characterizes does not have Al in the sample, Cu simple substance is residual, be completed into the Al-Cu intermetallic compound, and K2CO3 dissolves fully after the ultrasonic cleaning;
The sound absorbing capabilities of test samples: acoustical absorption coefficient reaches 0.735 on the 6300HZ frequency.
Material internal among above-mentioned each embodiment all comprises many Small Holes, and the perforation that interconnects, and porosity is about 62.5%.
Claims (8)
1. open Al-Cu sound-absorbing material is characterized in that:
(1) the acoustic absorbant batching is as follows:
1. the purity of raw material A l powder and Cu powder is 99.9%, all is 200 orders, by weight ratio Cu: Al ≈ 1.57: 1;
2. it is pure that pore creating material NaCl or anhydrous K 2CO3 are analysis, and particle mean size is 10 μ m, and volume content is about 62.5% of Al powder, Cu powder and pore creating material NaCl or anhydrous K 2CO3 cumulative volume;
3. again Al powder, Cu powder and pore creating material NaCl or anhydrous K 2CO3 powder are mixed;
(2) open Al-Cu sound-absorbing material adopts the preparation of combustion reaction synthetic method, and the concrete technology step is as follows:
1. adopt powder metallurgy die forming method to press down the cylindric compact specimen that makes diameter 29mm, thick 20mm at 950MPa pressure;
2. sample is put into rustless steel container, chamber wall thickness is 1mm approximately, fills up the gap with casting model powder, fully compresses the compacting sand;
The rustless steel container that 3. will install sample is put into heat-agglomerating in the high-frequency electromagnetic induction coil, and firing rate is 100 ℃/min～120 ℃/min, stopped heating after temperature reaches 960 ℃;
4. ultrasonic cleaning 1h after sample cools off, power 1.6KW;
5. take out sample, with sample drying;
6. the sound absorbing capabilities of test samples.
2. according to the described open Al-Cu sound-absorbing material of claim 1, it is characterized in that: described acoustic absorbant is pressed Al:24.175g, Cu:38.035g, NaCl:10.72g proportioning weighing powder.
3. according to the described open Al-Cu sound-absorbing material of claim 1, it is characterized in that: described acoustic absorbant is pressed Al:19.34g, Cu:30.428g, K2CO3,16.042g proportioning weighing powder.
4. according to the described open Al-Cu sound-absorbing material of claim 1, it is characterized in that: described acoustic absorbant is pressed Al:14.805g, Cu:22.821g, K2CO3:20.053g proportioning weighing powder.
5. the preparation method of described open Al-Cu sound-absorbing material according to claim 1 is characterized in that:
(1) the acoustic absorbant batching is as follows:
1. the purity of raw material A l powder and Cu powder is 99.9%, all is 200 orders, by weight ratio Cu: Al ≈ 1.57: 1;
2. it is pure that pore creating material NaCl or anhydrous K 2CO3 are analysis, and particle mean size is 10 μ m, and volume content is about 62.5% of Al powder, Cu powder and pore creating material NaCl or anhydrous K 2CO3 cumulative volume;
3. again Al powder, Cu powder and pore creating material NaCl or anhydrous K 2CO3 powder are mixed;
(2) open Al-Cu sound-absorbing material adopts the preparation of combustion reaction synthetic method, and the concrete technology step is as follows:
1. adopt powder metallurgy die forming method to press down the cylindric compact specimen that makes diameter 29mm, thick 20mm at 950MPa pressure;
2. sample is put into rustless steel container, chamber wall thickness is 1mm approximately, fills up the gap with casting model powder, fully compresses the compacting sand;
The rustless steel container that 3. will install sample is put into heat-agglomerating in the high-frequency electromagnetic induction coil, and firing rate is 100 ℃/min～120 ℃/min, stopped heating after temperature reaches 960 ℃;
4. ultrasonic cleaning 1h after sample cools off, power 1.6KW;
5. take out sample, with sample drying;
6. the sound absorbing capabilities of test samples.
6. according to the described open Al-Cu sound-absorbing material preparation method of claim 5, it is characterized in that:
Described firing rate is 100 ℃/min, stopped heating after temperature reaches 960 ℃.
7. according to the described open Al-Cu sound-absorbing material preparation method of claim 5, it is characterized in that: described firing rate is 100 ℃/min, stopped heating after temperature reaches 960 ℃.
8. according to the described open Al-Cu sound-absorbing material preparation method of claim 5, it is characterized in that: described firing rate is 120 ℃/min, stopped heating after temperature reaches 960 ℃.
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| CN1424416A (en) * | 2003-01-09 | 2003-06-18 | 哈尔滨工业大学 | High strength foam composite aluminum materials and preparation thereof |
| CN1557980A (en) * | 2004-01-19 | 2004-12-29 | 东南大学 | High porosity through hole multi-porous aluminum alloy, preparation method and special apparatus thereof |
| CN101104894A (en) * | 2007-07-09 | 2008-01-16 | 东南大学 | Pore structure modulating through-hole porous aluminum and aluminum alloy and preparation method thereof |
| CN101186982A (en) * | 2007-11-27 | 2008-05-28 | 昆明理工大学 | Through-hole foam copper preparation method |
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2009
- 2009-11-30 CN CN 200910220255 patent/CN101740020B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4713277A (en) * | 1985-07-19 | 1987-12-15 | Agency Of Industrial Science And Technology | Foamed metal and method of producing same |
| CN1300864A (en) * | 2000-11-23 | 2001-06-27 | 李道韫 | Process for preparing foam metal |
| CN1424416A (en) * | 2003-01-09 | 2003-06-18 | 哈尔滨工业大学 | High strength foam composite aluminum materials and preparation thereof |
| CN1557980A (en) * | 2004-01-19 | 2004-12-29 | 东南大学 | High porosity through hole multi-porous aluminum alloy, preparation method and special apparatus thereof |
| CN101104894A (en) * | 2007-07-09 | 2008-01-16 | 东南大学 | Pore structure modulating through-hole porous aluminum and aluminum alloy and preparation method thereof |
| CN101186982A (en) * | 2007-11-27 | 2008-05-28 | 昆明理工大学 | Through-hole foam copper preparation method |
Non-Patent Citations (1)
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| 王宙等.燃烧反应合成Ni-Al-SiC摩擦磨损性能研究.《表面技术》.2009,第38卷(第1期),第1页左栏第1段. * |
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