CN102134669A - Collecting pipe material for micro-channel heat exchanger and preparation method thereof - Google Patents
Collecting pipe material for micro-channel heat exchanger and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a collecting pipe material for a micro-channel heat exchanger, which consists of a layer of brazing layer alloy and a layer of matrix alloy, wherein the brazing layer alloy comprises the following components in percentage by weight: 9-11% of Si, 0.2-0.4% of Fe, 0.005-0.05% of Cu, 0.005-0.05% of Mn, 0.005-0.05% of Mg, 0.005-0.05% of Cr, 0.3-0.7% of Zn, 0.005-0.05% of Zr, 0.005-0.10% of Ti and the balance of A1; the preparation method of the brazing layer alloy comprises the processes of casting, modifying and founding; the preparation method of the matrix alloy comprises the processes of casting, founding and homogenizing; processes of compositing, hot rolling, cold rolling and intermediate annealing are carried out on the brazing layer alloy and the matrix alloy to obtain the collecting pipe material; the brazing layer alloy has favorable grain refining effect so that favorable fluidity, wettability and gap filling capability are provided during the brazing of the material; cold machining is carried out on the material with a machining rate of 25-35% after the intermediate annealing treatment; and the machining rate can ensure that the forming property is favorable during the pipe making of the material and the fluidity of the brazing layer is favorable during the brazing of the collecting pipe.
Description
Technical field
The present invention relates to a kind of micro-channel heat exchanger, specifically, relate to a kind of micro-channel heat exchanger, belong to the metal material processing technical field with header material and preparation method thereof.
Background technology
Energy-conservation is an important indicator of air-conditioning, interchanger is as the vitals of air-conditioning, along with development of modern industry, along with the requirement to air conditioner energy saving is more and more higher, the heat exchanging device is also more and more higher with the requirement of material, and single aluminum alloy materials can not satisfy to energy-conservation higher requirement, and the micro-channel heat exchanger that matrix material is made becomes optimal selection, micro-channel heat exchanger header material is used to produce the micro-channel heat exchanger header, and this material technology main development tendency is:
(1) research and development high-strength material guarantees to have high withstand voltage properties after the soldering, has good slump resistance energy during high temperature brazing, can be with the material attenuate, and weight reduction reduces cost and good heat-conducting and corrosion resistance nature; (2) the soldering rear surface wants light smooth, reduces the possibility of micro-channel heat exchanger frosting, reduces the frequency of its frosting and the time of defrosting, improves thermo-efficiency.
At present, micro-channel heat exchanger is composited by two layers with the header material, and accompanying drawing shows the structure of two layers of matrix material, comprises the matrix alloy 2 of bottom and the brazing layer alloy 1 on upper strata, brazing layer alloy 1 is as soldering, 2 strength support of matrix alloy and thermolysis.This material has good brazing property, heat conveyance performance, corrosion resistance and processing characteristics; The key of making this material is the selection adjustment of brazing layer alloy 1 composition, the design control of brazing layer thickness, and brazing layer increases the processing of wettability, flowability, grain refining.The selection adjustment of core alloying constituent, the optimisation technique of thermal treatment and rolling technology.
How to obtain to have that the soldering rear surface is smooth, welding is good, high, the withstand voltage height of intensity, heat conductivility is good, corrosion resistance nature is good material, become the technical barrier that those skilled in the art need solution badly.
Application number is that 2004800208146 Chinese patent application file discloses a kind of high strength aluminium alloy brazing sheet on August 30th, 2006, this patent application document discloses following content: this brazing sheet comprises Al-Cu matrix and at least one coating layer, described matrix comprises following composition (by weight percentage) Cu:1.2-4.0, Mn:0.06-1.5, Mg:0.06-1.5, Si :≤0.5, Zn :≤0.4, Fe :≤0.5, and optional one or more following Zr :≤0.25, Cr :≤0.25, V :≤0.25, Ti :≤0.25, surplus is aluminium and subsidiary element and impurity basically, described coating layer comprises the Al-Si based filler alloy and this coating layer is administered at least one side of matrix, and the strength ratio of this brazing sheet is higher, but is not suitable for doing micro-channel heat exchanger header material after the hight frequency welding.
Summary of the invention
Technical problem to be solved by this invention is at above problem, provides a kind of easy welding, the soldering rear surface is smooth, intensity is high micro-channel heat exchanger with header material and preparation method thereof.
For achieving the above object, the present invention adopts following technical scheme: a kind of micro-channel heat exchanger header material, header material are by the brazing layer alloy and matrix alloy is two-layer is composited, and it is characterized in that:
Described brazing layer alloy comprises the composition of following mass percent: Si:9-11%, Fe:0.2-0.4%, Cu:0.005-0.05%, Mn:0.005-0.05%, Mg:0.005-0.05%, Cr:0.005-0.05%, Zn:0.3-0.7%, Zr:0.005-0.05% and Ti:0.05-0.10%, and all the other are Al.
The scheme that technique scheme of the present invention is further optimized is as follows:
Described matrix alloy comprises the composition of following mass percent: Si:0.1-0.9%, Fe:0.1-0.5%, Cu:0.2-0.3%, Mn:0.9-1.3%, Mg:0.005-0.05%, Cr:0.005-0.05%, Zn:0.005-0.05%, Zr:0.005-0.05% and Ti:0.05-0.10%, and all the other are Al.
Described brazing layer alloy comprises the composition of following mass percent: Si:10.2%, Fe:0.3%, Cu:0.03%, Mn:0.03%, Mg:0.03%, Cr:0.03%, Zn:0.5%, Zr:0.03%, Ti:0.08% and Al:88.77%; Described matrix alloy comprises the composition of following mass percent: Si:0.5%, Fe:0.3%, Cu:0.26%, Mn:1.1%, Mg:0.03%, Cr:0.03%, Zn:0.03%, Zr:0.03%, Ti:0.08% and Al:97.64%.
Micro-channel heat exchanger header preparation methods, comprise the preparation method of brazing layer alloy and the preparation method of matrix alloy, the preparation method of brazing layer alloy comprises founding, the rotten processing and casting process, the preparation method of the matrix alloy treatment process that comprises founding, casts and homogenize, brazing layer alloy, matrix alloy obtain the header material after compound, hot rolling, cold rolling and process annealing operation.
The founding of described brazing layer alloy is: aluminium ingot is molten into aluminium liquid, according to composition in the described mass percent control aluminium liquid, carries out preliminary refining then.
The rotten treatment process of described brazing layer alloy is: change the aluminium liquid after the preliminary refining over to holding furnace, at insulation furnace refining 30-60min, temperature of aluminum liquid is controlled at 740-770 ℃, the alterant that to add relative aluminium ingot weight be 0.25-0.35%, refining 15-25min again, leave standstill casting behind the 10-15min, obtain the brazing layer alloy.
The founding of described matrix alloy is: aluminium ingot is molten into aluminium liquid, according to composition, casting then in the described mass percent control aluminium liquid.
The treatment process that homogenizes of described matrix alloy is: the processing that homogenizes again behind the casting, temperature 560-580 ℃, time 5h obtains matrix alloy.
Described recombining process is: with brazing layer alloy, matrix alloy seam, obtain the header material of seam, the clad ratio of brazing layer alloy is 8%-10%.
The header material of seam is carried out hot rolling, cold-rolling treatment, material after the cold-rolling treatment carries out process annealing to be handled, metal temperature is controlled at 380 ℃-420 ℃, insulation 2-3h, and the material after process annealing is handled carries out cold working with the working modulus of 25%-35%, obtains finished product header material.
The present invention adopts above technical scheme, compares with the prior art scheme, has the following advantages:
(1) in the rotten treatment process of brazing layer alloy, temperature of aluminum liquid is at 740-770 ℃, after adding alterant, the modification effect of alloy improves with the raising of rotten temperature, temperature of aluminum liquid improves in the time of 740 ℃ comparatively fast, because strengthen air-breathing the raising with temperature of the oxidation of fusion process interalloy, the air-breathing increase of oxidation of alloy was very fast when temperature surpassed 760 ℃.For solving air-breathing problem, add after the alterant refining 15-25min again, to cast after leaving standstill 10-15min, brazing layer alloy grain thinning effect is good, has good flowability, wettability, clearance filling capability in the time of can making the material soldering.
(2) processing that homogenizes again behind the matrix alloy casting can improve the comprehensive mechanical performance of material.
(3) in the recombining process, obtain the header material of seam after brazing layer alloy, the matrix alloy seam, the clad ratio of brazing layer alloy is 8%-10%, can guarantee that the soldering effect can improve material soldering rear surface light smooth degree again.
(4) material after process annealing is handled carries out cold working with the working modulus of 25%-35%, and processability was good when this working modulus can make the material tubulation, brazing layer good fluidity during the header soldering.
The present invention is described in detail below in conjunction with drawings and Examples.
Description of drawings
Accompanying drawing is the structural representation that micro-channel heat exchanger is used the header material in the embodiment of the invention.
Among the figure,
1-brazing layer alloy, the 2-matrix alloy.
Embodiment
Embodiment, a kind of micro-channel heat exchanger header material, the header material is by brazing layer alloy 1 and matrix alloy 2 two-layer being composited, the header preparation methods comprises the preparation method of brazing layer alloy 1 and the preparation method of matrix alloy 2, the preparation method of brazing layer alloy 1 comprises founding, the rotten processing and casting process, the preparation method of matrix alloy 2 treatment process that comprises founding, casts and homogenize, brazing layer alloy 1, matrix alloy 2 obtain the header material after compound, hot rolling, cold rolling and process annealing operation;
The founding of brazing layer alloy 1 is: aluminium ingot is molten into aluminium liquid, carries out the Chemical Composition analysis with the direct reading spectroscopic analyser, composition in the control aluminium liquid carries out preliminary refining then;
The rotten treatment process of brazing layer alloy 1 is: change the aluminium liquid after the preliminary refining over to holding furnace, at insulation furnace refining 30-60min, temperature of aluminum liquid is controlled at 740-770 ℃, the alterant that to add relative aluminium ingot weight be 0.25-0.35%, refining 15-25min again, leave standstill casting behind the 10-15min, obtain brazing layer alloy 1;
The founding of matrix alloy 2 is: aluminium ingot is molten into aluminium liquid, carries out the Chemical Composition analysis with the direct reading spectroscopic analyser, composition, casting then in the control aluminium liquid;
The treatment process that homogenizes of matrix alloy 2 is: the processing that homogenizes again behind the casting, and temperature 560-580 ℃, time 5h obtains matrix alloy 2;
Recombining process is: with brazing layer alloy 1, matrix alloy 2 seam, obtain the header material of seam, the clad ratio of brazing layer alloy 1 is 8%-10%;
The header material of seam is carried out hot rolling, cold-rolling treatment, and the material after the cold-rolling treatment carries out process annealing to be handled, and metal temperature is controlled at 380 ℃-420 ℃, insulation 2-3h;
Material after process annealing is handled carries out cold working with the working modulus of 25%-35%, cuts after stretch bending is rectified and handled and obtains finished product header material.
Brazing layer alloy 1 comprises the composition of following mass percent: Si:9-11%, Fe:0.2-0.4%, Cu:0.005-0.05%, Mn:0.005-0.05%, Mg:0.005-0.05%, Cr:0.005-0.05%, Zn:0.3-0.7%, Zr:0.005-0.05% and Ti:0.05-0.10%, and all the other are Al.
Carry out six tests according to above method, in the test in the brazing layer alloy 1 mass percent of each composition as shown in table 1, the mass percent of each composition is as shown in table 2 in the matrix alloy 2, the thickness of finished product header material is 1.3mm, gained micro-channel heat exchanger header Tensile strength Rp0.2:145-185Mpa, yield strength Rm:120-160MPa, unit elongation A50mm:6-8%, this performance is fit to be connected into header by tubing machine through ratio-frequency welding, the solder yield height.Through test, the finished material percentage pass reduction is excessive, and then material is too hard; Draft is too small, and then material is too soft, all is not suitable for making the micro-channel heat exchanger header.
Table 1
| Component | Test 1 | |
Test 3 | Test 4 | Test 5 | Test 6 |
| Si(％) | 11 | 10.8 | 10.2 | 9.6 | 9.3 | 9 |
| Fe(％) | 0.4 | 0.35 | 0.3 | 0.3 | 0.25 | 0.2 |
| Cu(％) | 0.05 | 0.04 | 0.03 | 0.02 | 0.01 | 0.005 |
| Mn(％) | 0.05 | 0.04 | 0.03 | 0.02 | 0.01 | 0.005 |
| Mg(％) | 0.05 | 0.04 | 0.03 | 0.02 | 0.01 | 0.005 |
| Cr(％) | 0.05 | 0.04 | 0.03 | 0.02 | 0.01 | 0.005 |
| Zn(％) | 0.7 | 0.6 | 0.5 | 0.4 | 0.35 | 0.3 |
| Zr(％) | 0.05 | 0.04 | 0.03 | 0.02 | 0.01 | 0.005 |
| Ti(％) | 0.1 | 0.09 | 0.08 | 0.06 | 0.055 | 0.05 |
| Al (％) | 87.55 | 87.96 | 88.77 | 89.54 | 89.995 | 90.425 |
Table 2
| Component | Test 1 | |
Test 3 | Test 4 | Test 5 | Test 6 |
| Si(％) | 0.9 | 0.7 | 0.5 | 0.3 | 0.2 | 0.1 |
| Fe(％) | 0.5 | 0.4 | 0.3 | 0.3 | 0.2 | 0.1 |
| Cu(％) | 0.3 | 0.28 | 0.26 | 0.24 | 0.22 | 0.2 |
| Mn(％) | 1.3 | 1.2 | 1.1 | 1.0 | 0.95 | 0.9 |
| Mg(％) | 0.05 | 0.04 | 0.03 | 0.02 | 0.01 | 0.005 |
| Cr(％) | 0.05 | 0.04 | 0.03 | 0.02 | 0.01 | 0.005 |
| Zn(％) | 0.05 | 0.04 | 0.03 | 0.02 | 0.01 | 0.005 |
| Zr(％) | 0.05 | 0.04 | 0.03 | 0.02 | 0.01 | 0.005 |
| Ti(％) | 0.1 | 0.09 | 0.08 | 0.06 | 0.055 | 0.05 |
| Al(％) | 96.7 | 97.17 | 97.64 | 98.02 | 98.335 | 98.63 |
Agent add-on on the turn is 0.3%, working modulus be 30% and clad ratio be that the gained micro-channel heat exchanger is relatively good with the performance of header material under 9% the condition, the performance such as the following table of gained header material under this condition:
| Performance index | Test 1 | |
Test 3 | Test 4 | Test 5 | Test 6 |
| Rp0.2(MPa) | 166 | 163 | 160 | 159 | 158 | 155 |
| Rm(MPa) | 154 | 150 | 148 | 147 | 147 | 143 |
| A50mm(％) | 6.7 | 6.7 | 6.8 | 6.8 | 7 | 7 |
Header material with above specimen method preparation is good through welding fabrication on probation, the soldering rear surface is smooth, heat conductivility is good, corrosion resistance nature is good, meets service requirements, and the effect of testing 3 gained header materials is best.
Produce interchanger with the materials processing of gained header, in the course of processing, the good fluidity of brazing layer alloy, welding easily, welding back material surface is smooth, and is more effective than the current material.
The al-sr alloy alterant AlSr10 that above alterant adopts Sichuan blue moral high-tech industry company limited to produce, can also use the al-sr alloy alterant SX-Al-Sr10 of the South Sea, Foshan City three Hunan Aluminum Materials Co., Ltd production or the al-sr alloy alterant of the bright rare metal of Yangzhou company limited, can also use other alterant, use the al-sr alloy alterant than using the effective of other alterant.
Claims (10)
1. micro-channel heat exchanger header material, the header material be is characterized in that by brazing layer alloy (1) and two-layer being composited of matrix alloy (2):
Described brazing layer alloy (1) comprises the composition of following mass percent: Si:9-11%, Fe:0.2-0.4%, Cu:0.005-0.05%, Mn:0.005-0.05%, Mg:0.005-0.05%, Cr:0.005-0.05%, Zn:0.3-0.7%, Zr:0.005-0.05% and Ti:0.05-0.10%, all the other are Al.
2. a kind of micro-channel heat exchanger header material as claimed in claim 1 is characterized in that: described matrix alloy (2) comprises the composition of following mass percent:
Si:0.1-0.9%, Fe:0.1-0.5%, Cu:0.2-0.3%, Mn:0.9-1.3%, Mg:0.005-0.05%, Cr:0.005-0.05%, Zn:0.005-0.05%, Zr:0.005-0.05% and Ti:0.05-0.10%, all the other are Al.
3. a kind of micro-channel heat exchanger header material as claimed in claim 2 is characterized in that: described brazing layer alloy (1) comprises the composition of following mass percent: Si:10.2%, Fe:0.3%, Cu:0.03%, Mn:0.03%, Mg:0.03%, Cr:0.03%, Zn:0.5%, Zr:0.03%, Ti:0.08% and Al:88.77%;
Described matrix alloy (2) comprises the composition of following mass percent:
Si:0.5%, Fe:0.3%, Cu:0.26%, Mn:1.1%, Mg:0.03%, Cr:0.03%, Zn:0.03%, Zr:0.03%, Ti:0.08% and Al:97.64%.
4. as claim 1-3 micro-channel heat exchanger header preparation methods as described in one of them, it is characterized in that: described preparation method comprises the preparation method of brazing layer alloy (1) and the preparation method of matrix alloy (2), the preparation method of brazing layer alloy (1) comprises founding, the rotten processing and casting process, the preparation method of matrix alloy (2) treatment process that comprises founding, casts and homogenize, brazing layer alloy (1), matrix alloy (2) obtain the header material after compound, hot rolling, cold rolling and process annealing operation.
5. preparation method as claimed in claim 4 is characterized in that: the founding of described brazing layer alloy (1) is: aluminium ingot is molten into aluminium liquid, according to composition in the described mass percent control aluminium liquid, carries out preliminary refining then.
6. preparation method as claimed in claim 5, it is characterized in that: the rotten treatment process of described brazing layer alloy (1) is: change the aluminium liquid after the preliminary refining over to holding furnace, at insulation furnace refining 30-60min, temperature of aluminum liquid control is deposited 740-770 ℃, the alterant that to add relative aluminium ingot weight be 0.25-0.35%, refining 15-25min again leaves standstill casting behind the 10-15min, obtains brazing layer alloy (1).
7. preparation method as claimed in claim 4 is characterized in that: the founding of described matrix alloy (2) is: aluminium ingot is molten into aluminium liquid, according to composition, casting then in the described mass percent control aluminium liquid.
8. preparation method as claimed in claim 7 is characterized in that: the treatment process that homogenizes of described matrix alloy (2) is: the processing that homogenizes again behind the casting, temperature 560-580 ℃, time 5h obtains matrix alloy (2).
9. preparation method as claimed in claim 4 is characterized in that: described recombining process is: with brazing layer alloy (1), matrix alloy (2) seam, obtain the header material of seam, the clad ratio of brazing layer alloy (1) is 8%-10%.
10. preparation method as claimed in claim 9, it is characterized in that: the header material of seam is carried out hot rolling, cold-rolling treatment, material after the cold-rolling treatment carries out process annealing to be handled, metal temperature is controlled at 380 ℃-420 ℃, insulation 2-3h, material after process annealing is handled carries out cold working with the working modulus of 25%-35%, obtains finished product header material.
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| CN102620596A (en) * | 2012-04-01 | 2012-08-01 | 江苏格林威尔金属材料科技有限公司 | Aluminum alloy horizontal flow pipe with braze welding layer and manufacturing method thereof |
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