CN102345029A - Copper alloy material for radiator fins - Google Patents
Copper alloy material for radiator fins Download PDFInfo
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- CN102345029A CN102345029A CN201110174748XA CN201110174748A CN102345029A CN 102345029 A CN102345029 A CN 102345029A CN 201110174748X A CN201110174748X A CN 201110174748XA CN 201110174748 A CN201110174748 A CN 201110174748A CN 102345029 A CN102345029 A CN 102345029A
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Abstract
The invention relates to a copper alloy material for radiator fins. The material comprises components of, by weight: 0.3 to 1.2 of Sn, 0.05 to 0.10% of P, 1.2 to 2.5% of Zn, 8.2 to 13.5% of Al, 0.5 to 1.2% of Mg, 0.3 to 1.6 parts of Cr, and balance of Cu and inevitable impurities. The thermal resistance of the copper alloy material is good. When prepared copper alloy radiator fins are heated to a high temperature of 700 DEG C, excellent intensive properties are maintained in the fins. Also, processing property and especially cold processing property of the material is excellent.
Description
Technical field
The present invention relates to a kind of Cu alloy material, the present invention relates to a kind of Cu alloy material that is suitable for heat radiator fin specifically, it has excellent erosion resistance, and its processability is good.
Background technology
Being generally used for fin tube heat exchanger is the U font copper pipe (perhaps copper alloy tube) that bending machining is become the hair(-)pin shape, and the communicating pores of the radiator element that is made up of the aluminum or aluminum alloy plate inserts expanding tool in the copper pipe said copper pipe is carried out expander; Copper pipe and aluminium radiator fin are connected airtight; In addition, expander is carried out in the open end of copper pipe, become the crooked copper pipe of U font to insert this expander open end bending machining; Crooked copper pipe is brazed in the expander open end of U font copper pipe with solders such as phosphor-coppers; Thus, connect a plurality of U font copper pipes, make heat exchanger through crooked copper pipe.
For this reason, the copper pipe that is used for heat exchanger requires thermal conductivity, bendability and solderability good.Therefore, these characteristics are good, and the deoxidized copper with suitable intensity is widely used.
At present; Be used for the heat-transfer pipe of aforementioned fin tube heat exchanger because U font bending machining and expander will be carried out; Therefore the soft material through adopting the annealing material or the annealing material having been carried out the light processing of drawing etc.; It has sufficient deformability in the face of these processing, and can process with very little power.Under the situation of phosphorized copper system heat-transfer pipe,,, need the wall thickness of extra strong pipe therefore for the increase of the running pressure of corresponding refrigeration agent because tensile strength is little.In addition; When the assembling of heat exchanger; Brazing portion is heated the several seconds to tens of second in the temperature more than 800 ℃, therefore brazing portion and near compare thickization of crystal grain with other parts because the softening state that becomes the intensity reduction; Therefore reduce in order to remedy the intensity that causes because of brazing, need further thicken wall thickness.So, as passing pipe heat if use phosphorized copper, then the quality of heat exchanger increases, and price rises, and therefore a kind of tensile strength of just strong expectation is high, excellent in workability, the heat-transfer pipe with good thermal conductivity.For even the wall thickness attenuation of the phosphorous deoxidize copper tube that is used in fin tube heat exchanger still can tolerate practicality; Plastic working through the phosphorous deoxidize copper tube after the annealing being carried out drawing processing etc. gets final product to improve its tensile strength; But because plastic working causes ductility to reduce, thereby can not carry out bending machining.
In order to adapt to such requirement; As 0.2% yield-point and the excellent copper alloy tube of fatigue strength; For example proposing has a kind of heat exchanger to use the non junction copper alloy tube; It contains Co:0.02～0.2 quality %, P:0.01～0.05 quality %, C:1～20ppm, and surplus is made up of Cu and unavoidable impurities, and the oxygen of impurity is below the 50ppm.In addition; A kind of copper alloy tube for heat exchanger is also proposed; It has following composition: contain below Sn:0.1～1.0 quality %, P:0.005～0.1 quality %, the O:0.005 quality % and below the H:0.0002 quality %; Surplus is made up of Cu and unavoidable impurities, and average crystal grain diameter is below the 30 μ m.
Yet, though separate out intensity and tensile strength improved by what the phosphide of Co brought, not rising of withstand voltage strength at break in the ratio that intensity rises.In addition, the brazing heating when making owing to heat exchanger, said phosphide solid solution, the intensity of heat-transfer pipe reduces near brazing portion.Therefore, when it was used for heat-transfer pipe, existing not too can the attenuate wall thickness, thereby can not get the problem points of desired effects.
In addition; Intensity improves through the solid solution strength of Sn; Be used for heat-transfer pipe with the wall thickness attenuation that can make pipe; But when carrying out U word bending machining in order to become heat exchanger, then distinguish to have following problem points: at bend gauffer or crackle take place easily, this part becomes starting point and is not reaching under the very low intensity of expection and will destroyed.
Summary of the invention
Above-mentioned purpose in view of the copper alloy heat exchanger materials existence of using in the prior art; The Cu alloy material that the purpose of this invention is to provide a kind of heat radiator fin; It brings up to tensile strength can not make the bendability deterioration more than the demand, bendability and solidity to corrosion are also excellent in addition.
To achieve these goals, the present invention has adopted following technical scheme:
A kind of Cu alloy material of heat radiator fin, it has following composition: Sn:0.3-1.2 wt%, P:0.05-0.10 wt%, Zn:1.2-2.5 wt%; Al:8.2-13.5 wt%; Mg:0.5-1.2 wt%, Cr:0.3-1.6 wt%, surplus is that Cu and unavoidable impurities constitute.
The meaning and the qualification reason of the alloying constituent of Cu alloy material of the present invention are described below.
Sn：
In Cu alloy material of the present invention, Sn has tensile strength, unit elongation and the thermotolerance of raising, suppresses the effect of thickization of crystal grain.When the content of Sn surpasses 1.2 wt%, the conduction of Cu alloy material, thermal conductivity will significantly reduce; When the content of Sn was lower than 0.30 wt%, material can not obtain sufficient tensile strength and trickle crystal grain diameter after annealing and brazing heating.In the application's Cu alloy material, the content of Sn further is preferably: 0.5-0.9 wt%; Preferred its content is 0.6-0.9 wt%.
P：
Through in Cu alloy material, adding P, be used to prevent the oxidation of Sn, in alloy of the present invention,, then, hot pressing is prone to crack when going out if P content surpasses 0.10 wt%, and stress corrosion cracking susceptibility uprises.If P content is lower than 0.05 wt%, then because the deoxidation deficiency causes the oxygen amount to increase, with the oxidation that Sn inevitably takes place, as the bendability reduction of Cu alloy material.
Zn：
Through in Cu alloy material, adding Zn; Can increase and make and the flowability of weld period, can improve the workability of material, yet if the existence of the intermetallic phase that the further increase of the content of Zn will cause not expecting; Lure intergranular corrosion easily; And work as content at 1.2-2.5 wt%, when improving the material workability, the corrosion resisting property and the intensity of material there are not adverse influence.The preferred content of Zn is 1.5-2.2 wt%.
AL：
Through in Cu alloy material, adding Al, can the refinement alloying pellet, thus the erosion that produces to the grain boundary infiltration because of molten solder can be inhibited soldering the time.Preferably, the content range of Al is: 9.0-12.5 wt%.
Mg：
Through in Cu alloy material, adding Mg, the effect of the intensity that can be improved, the Al in alloy can work in coordination with the corrosion resisting property of improving material.If content surpasses 1.2 wt%, will significantly reduce brazing property, and addition is not remarkable to Cu alloy material intensity and corrosion proof raising during less than 0.5 wt%.The preferred content of Mg is 0.7-1.0 wt%.
Cr：
In copper alloy, add proper C r and help improving the resistance to elevated temperatures of alloy, and the Cr that adds helps forming the compound sull at alloy surface with other metal, and then improve corrosion resistance of alloy.The content range of Cr is in copper alloy of the present invention: 0.3-1.6 wt%.When the content of Cr the time greater than 1.6 wt%, with the hot workability that reduces copper alloy, because of rather than preferably.And when the content of Cr is lower than 0.3 wt%, not remarkable to the solidity to corrosion of alloy, stable on heating raising.Preferably, the content range of Cr is: 0.5-1.2wt%.
In addition; The invention also discloses the preparation method of the Cu alloy material of above-mentioned heat radiator fin; It is characterized in that, will under nitrogen protection atmosphere, be heated to 1150-1280 ℃ of insulation 50-200 min by the alloy raw material of Sn, P, Zn, Al, Mg, Cr and the Cu of above-mentioned weight percent proportioning; Add the BaCl that accounts for alloy raw material gross weight 0.2-0.8wt%
2, stir 25-75 min; Afterwards with alloy liquid at 1080-1250 ℃ of casting; Then in 650-820 ℃ of insulation 2-10 h processings that homogenize, cool off and obtain described Cu alloy material.Described Cu alloy material is through cold working and/or hot-work and/or casting, and prior aries such as for example forging, hot pressing, clod wash processing are processed into the copper alloy heat sink fin.
Cu alloy material of the present invention behind homogenizing annealing, is observed its metallographic structure, and crystal grain is tiny and evenly beneficial to the solidity to corrosion that improves copper alloy; And do not find to exist in a large number the heterogeneous phase of galvanic corrosion in its tissue, alleviated the tendency that intergranular corrosion takes place greatly, the probability that spot corrosion takes place is also very little; And the intensity of material compares with common copper alloy significant raising also arranged, and its intensity is usually greater than 320 MPa, and preferably its intensity is higher than 420 MPa; In addition, Cu alloy material resistance toheat of the present invention is good, and the copper alloy heat sink fin of preparation is heated to 700 ℃ high temperature, and it still can keep excellent strength property; And its processing characteristics, particularly excellent cold-workability exhibiting.
Embodiment
Following the present invention will combine concrete embodiment that the present invention is done further explanation and explanation.
Press the shown mass percent of table 1, prepare Cu alloy material of the present invention.Concrete preparation process is: will under nitrogen protection atmosphere, be heated to 1250 ℃ of insulation 150 min by the alloy raw material of Sn, P, Zn, Al, Mg, Cr and the Cu of above-mentioned weight percent proportioning; Add the BaCl that accounts for alloy raw material gross weight 0.3wt%
2, stir 45 min; Afterwards with alloy liquid at 1180 ℃ of casting; Then in 720 ℃ of insulation 5 h processings that homogenize, cool off and obtain described Cu alloy material.
The chemical ingredients of table 1 mother metal (surplus is Cu)
| Numbering | Sn | P | Zn | Al | Mg | Cr |
| 1 | 0.3 | 0.50 | 1.2 | 8.2 | 0.5 | 0.3 |
| 2 | 0.5 | 0.05 | 1.35 | 8.8 | 1.6 | 0.5 |
| 3 | 0.6 | 0.06 | 1.5 | 9.4 | 0.7 | 0.7 |
| 4 | 0.7 | 0.06 | 1.65 | 10.0 | 0.8 | 0.9 |
| 5 | 0.8 | 0.07 | 1.80 | 10.8 | 0.9 | 1.1 |
| 6 | 1.0 | 0.07 | 1.95 | 11.6 | 1.0 | 1.3 |
| 7 | 1.1 | 0.09 | 2.2 | 12.4 | 1.1 | 1.5 |
| 8 | 1.2 | 0.10 | 2.5 | 13.5 | 1.2 | 1.6 |
Strength of materials test
In order to measure tensile strength, the materials processed that will pass through at normal temperatures after the cold working becomes standardized component, carries out the standard tensile test, the tensile strength of test material.Person between the tensile strength 320 MPa-420 MPa is evaluated as very, is lower than 320 MPa persons and is evaluated as badly, it is excellent to surpass being evaluated as of 420 MPa.
The material corrosion resistance test
Size with 50 * 50 mm cuts out sample respectively, carries out salt-fog test.The corrosion test time set is 1000 hours, material surface do not have the degree of depth surpass 0.1 mm corrosion pit, be evaluated as very, it is poor to have the sample of the corrosion pit that surpasses 0.1 mm to be evaluated as corrodibility, no corrosion pit, be evaluated as excellent.Test result is presented in the table 2.
Table 2: sample tensile strength and salt-fog test result
| Specimen coding | Tensile strength | SWAAT test 1000 hours |
| 1 | Very | Very |
| 2 | Very | Very |
| 3 | Excellent | Excellent |
| 4 | Excellent | Excellent |
| 5 | Excellent | Excellent |
| 6 | Excellent | Excellent |
| 7 | Excellent | Very |
| 8 | Excellent | Very |
Claims (8)
1. the Cu alloy material of a heat radiator fin, it has following composition: Sn:0.3-1.2 wt%, P:0.05-0.10 wt%, Zn:1.2-2.5 wt%; Al:8.2-13.5 wt%; Mg:0.5-1.2 wt%, Cr:0.3-1.6 wt%, surplus is that Cu and unavoidable impurities constitute.
2. the described Cu alloy material of claim 1 is characterized in that the content of described Sn is: 0.5-0.9 wt%.
3. the described Cu alloy material of claim 1 is characterized in that the content of described Sn is: 0.6-0.9 wt%.
4. the described Cu alloy material of claim 1, the content that it is characterized in that described Zn is 1.5-2.2 wt%.
5. the described Cu alloy material of claim 1 is characterized in that the content of described Al is: 9.0-12.5 wt%.
6. the described Cu alloy material of claim 1, the content that it is characterized in that described Mg is 0.7-1.0 wt%.
7. the described Cu alloy material of claim 1 is characterized in that the content of described Cr is: 0.5-1.2wt%.
8. heat radiator fin is characterized in that being processed by said each the Cu alloy material of heat radiator fin of claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110174748XA CN102345029A (en) | 2011-06-27 | 2011-06-27 | Copper alloy material for radiator fins |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110174748XA CN102345029A (en) | 2011-06-27 | 2011-06-27 | Copper alloy material for radiator fins |
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| CN102345029A true CN102345029A (en) | 2012-02-08 |
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| CN201110174748XA Pending CN102345029A (en) | 2011-06-27 | 2011-06-27 | Copper alloy material for radiator fins |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85106324A (en) * | 1985-08-12 | 1987-03-04 | 沈阳有色金属加工厂 | Corrosion-resisting copper alloy for heat exchanger |
| CN101078069A (en) * | 2007-06-25 | 2007-11-28 | 云南新铜人实业有限公司 | Copper-base alloy for heat exchanger |
-
2011
- 2011-06-27 CN CN201110174748XA patent/CN102345029A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85106324A (en) * | 1985-08-12 | 1987-03-04 | 沈阳有色金属加工厂 | Corrosion-resisting copper alloy for heat exchanger |
| CN101078069A (en) * | 2007-06-25 | 2007-11-28 | 云南新铜人实业有限公司 | Copper-base alloy for heat exchanger |
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Application publication date: 20120208 |