CN102346000A - Copper alloy material of radiator heat pipe - Google Patents
Copper alloy material of radiator heat pipe Download PDFInfo
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- CN102346000A CN102346000A CN 201110174766 CN201110174766A CN102346000A CN 102346000 A CN102346000 A CN 102346000A CN 201110174766 CN201110174766 CN 201110174766 CN 201110174766 A CN201110174766 A CN 201110174766A CN 102346000 A CN102346000 A CN 102346000A
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Abstract
The invention relates to a copper alloy material of a radiator heat pipe. The copper alloy material comprises the following components by weight percent: 0.5-1.2% of Sn, 0.05-0.10% of P, 2.2-8.5% of Al, 1.2-5.0% of Ni, 0.5-1.2% of Mg, 0.3-1.6% of Ti and the balance Cu and inevitable impurities. The copper alloy material provided by the invention has good heat-resistant performance and can still maintain the excellent strength performance when the prepared copper alloy radiator heat pipe is heated to the high temperature of 75 DEG C; and meanwhile, the machining performance of the material, especially the cold machining performance, 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 the radiator heat pipe specifically, it has excellent corrosion 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; The through hole of the fin that constitutes by the aluminum or aluminum alloy plate; Expanding tool inserted 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 open end to 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 through crooked copper pipe, make heat exchanger.
For this reason, the copper pipe that is used for heat exchanger requires thermal conductivity, bendability and braze ability good.Therefore, these characteristics are good, and the deoxidized cooper with suitable intensity is widely used.
At present; U font bending machining and expander be used for the heat-transfer pipe of aforementioned fin tube heat exchanger because 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 morphotropism 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 cold-producing medium because tensile strength is little.In addition; When the assembling of heat exchanger; Brazing portion is heated the several seconds to tens of seconds in the temperature more than 800 ℃; Therefore brazing portion and near compare thickization of crystal grain with other parts; Owing to 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 pyroconductivity.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 propose to have a kind of heat exchanger non junction copper alloy tube; It contains Co:0.02～0.2 quality %, P:0.01～0.05 quality %, C:1～20ppm; 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 breakdown strength 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 and 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 radiator heat pipe; It brings up to tensile strength can not make the bendability deterioration more than the demand, bendability and corrosion resistance are also excellent in addition.
To achieve these goals, the present invention has adopted following technical scheme:
A kind of Cu alloy material of radiator heat pipe; It has following composition: Sn:0.5-1.2 wt%, P:0.05-0.10 wt%, Al:2.2-8.5 wt%, Ni:1.2-5.0 wt%, Mg:0.5-1.2 wt%; Ti:0.3-1.6 wt%, surplus is that Cu and unavoidable impurities constitute.
The meaning and the qualification reason of the alloying component of Cu alloy material of the present invention are described below.
Sn：
In Cu alloy material of the present invention, Sn has tensile strength, percentage elongation and the hear resistance 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 0.50 wt%, Cu alloy material of the present invention 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: 0.75-1.05 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 (SCC) sensitiveness uprises.If P content is lower than 0.05 wt%, then because the deoxidation deficiency causes the oxygen amount to increase, will the oxidation of Sn take place inevitably, as the bendability reduction of Cu alloy material.
：
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: 3.5-6.5 wt%.Preferred content range is 3.5-5.0 wt%.
Ni：
Through in Cu alloy material, adding Ni, can crystal grain thinning, improve the intensity of copper alloy, the anti-pulsating stress that particularly can improve copper alloy is tired, but also can improve the resistance to elevated temperatures of alloy, for example high-temperature corrosion resistance performance.If yet the content of Ni surpasses 5.0 wt%, the mobile variation of material, the processability of material is variation also.When if the content of Ni is lower than 1.2 wt%, the interpolation of Ni is limited to the raising degree of alloy strength, corrosion resisting property.The preferred content of Ni is 1.5-4.2 wt%.Preferred, its content range is 2.0-4.5 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%.
Ti：
In copper alloy, adding an amount of Ti helps crystal grain thinning, improves corrosion resistance of alloy.The content range of Ti is in copper alloy of the present invention: 0.3-1.6 wt%.When the content of Ti the time greater than 1.6 wt%, will reduce the hot-working character of copper alloy, because of rather than preferably.And when the content of Ti is lower than 0.3 wt%, not remarkable to the corrosion proof raising of alloy.Preferably, the content range of Ti is: 0.5-1.2wt%.
In addition; The invention also discloses the preparation method of the Cu alloy material of above-mentioned radiator heat pipe; It is characterized in that, will under nitrogen protection atmosphere, be heated to 1180-1280 ℃ of insulation 80-200 min by the alloy raw material of Sn, P, Al, Ni, Mg, Ti and the Cu of above-mentioned percentage by weight proportioning; Add the BaCl that accounts for alloy raw material gross weight 0.2-0.8wt%
2, stir 30-75 min; Afterwards with alloy liquid at 1150-1250 ℃ of moulding by casting; Then in 680-820 ℃ 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-working and/or casting, and prior aries such as for example forging, hot pressing, clod wash processing are processed into the copper alloy cooling flat tube.
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 corrosion resistance that improves copper alloy; And do not find to exist in a large number the heterogeneous phase of electrochemical corrosion in its tissue, alleviated the tendency that intercrystalline 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 450 MPa; In addition, Cu alloy material heat resistance of the present invention is good, and the copper alloy heat sink heat pipe of preparation is heated to 750 ℃ high temperature, and it still can keep excellent strength character; And its processing characteristics, particularly excellent cold-workability exhibiting.
The specific 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 1200 ℃ of insulation 120 min by the alloy raw material of Sn, P, Al, Ni, Mg, Ti and the Cu of above-mentioned percentage by weight proportioning; Add the BaCl that accounts for alloy raw material gross weight 0.5wt%
2, stir 75 min; Afterwards with alloy liquid at 1180 ℃ of moulding by casting; Then in 800 ℃ of insulation 3 h processings that homogenize, cool off and obtain described Cu alloy material.
The chemical composition of table 1 mother metal (surplus is Cu and unavoidable impurities)
| Numbering | Sn | P | Ni | Al | Mg | Ti |
| 1 | 0.3 | 0.50 | 1.2 | 2.2 | 0.5 | 0.3 |
| 2 | 0.5 | 0.05 | 1.8 | 3.0 | 1.6 | 0.5 |
| 3 | 0.6 | 0.06 | 2.4 | 3.8 | 0.7 | 0.7 |
| 4 | 0.7 | 0.06 | 3.0 | 4.6 | 0.8 | 0.9 |
| 5 | 0.8 | 0.07 | 3.6 | 5.5 | 0.9 | 1.1 |
| 6 | 1.0 | 0.07 | 4.0 | 6.4 | 1.0 | 1.3 |
| 7 | 1.1 | 0.09 | 4.6 | 7.2 | 1.1 | 1.5 |
| 8 | 1.2 | 0.10 | 5.0 | 8.5 | 1.2 | 1.6 |
Strength of materials test
In order to measure hot strength, the materials processing that will pass through at normal temperatures after the cold working becomes standard component, carries out the standard tensile test, the tensile strength of test material.Person between the tensile strength 320 MPa-450 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 450 MPa.
The material corrosion resistance test
Size with 50 * 50 mm cuts out sample respectively, carries out salt spray test.The corrosion test time set is 1000 hours, material surface do not have the degree of depth surpass 0.1 mm etch pit, be evaluated as very, it is poor to have the sample of the etch pit that surpasses 0.1 mm to be evaluated as corrosivity, no etch pit, be evaluated as excellent.Test result is presented in the table 2.
Table 2: sample hot strength and salt spray test result
| Specimen coding | Hot strength | SWAAT test 1000 hours |
| 1 | Very | Very |
| 2 | Very | Very |
| 3 | Excellent | Excellent |
| 4 | Excellent | Excellent |
| 5 | Excellent | Excellent |
| 6 | Excellent | Very |
| 7 | Excellent | Very |
| 8 | Excellent | Very |
Claims (9)
1. the Cu alloy material of a radiator heat pipe; It has following composition: Sn:0.5-1.2 wt%, P:0.05-0.10 wt%, Al:2.2-8.5 wt%, Ni:1.2-5.0 wt%, Mg:0.5-1.2 wt%; Ti: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: 0.75-1.05 wt%.
3. the described Cu alloy material of claim 1 is characterized in that the content of described Al is: 3.5-6.5 wt%.
4. the described Cu alloy material of claim 1 is characterized in that the content of described Al is: 3.5-5.0 wt%.
5. the described Cu alloy material of claim 1 is characterized in that the content of described Ni is: 1.5-4.2 wt%.
6. the described Cu alloy material of claim 1 is characterized in that the content of described Ni is: 2.0-4.5 wt%.
7. the described Cu alloy material of claim 1, the content that it is characterized in that described Mg is 0.7-1.0 wt%.
8. the described Cu alloy material of claim 1, the content that it is characterized in that described Ti is 0.5-1.2 wt%.
9. radiator heat pipe is characterized in that being processed by said each the Cu alloy material of radiator heat pipe of claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110174766 CN102346000A (en) | 2011-06-27 | 2011-06-27 | Copper alloy material of radiator heat pipe |
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| CN 201110174766 CN102346000A (en) | 2011-06-27 | 2011-06-27 | Copper alloy material of radiator heat pipe |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2065166A (en) * | 1979-11-22 | 1981-06-24 | Sumitomo Light Metal Ind | Copper-base-alloy tube for carrying potable water and for a heat exchanger |
| CN1570165A (en) * | 2003-02-28 | 2005-01-26 | 威兰德-沃克公开股份有限公司 | Lead-free copper alloy and a method of manufacture |
| CN1688732A (en) * | 2002-09-13 | 2005-10-26 | 奥林公司 | Age-hardening copper-base alloy and processing |
| WO2006000307A2 (en) * | 2004-06-23 | 2006-01-05 | Wieland-Werke Ag | Corrosion-resistant copper alloy containing magnesium and use thereof |
-
2011
- 2011-06-27 CN CN 201110174766 patent/CN102346000A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2065166A (en) * | 1979-11-22 | 1981-06-24 | Sumitomo Light Metal Ind | Copper-base-alloy tube for carrying potable water and for a heat exchanger |
| CN1688732A (en) * | 2002-09-13 | 2005-10-26 | 奥林公司 | Age-hardening copper-base alloy and processing |
| CN1570165A (en) * | 2003-02-28 | 2005-01-26 | 威兰德-沃克公开股份有限公司 | Lead-free copper alloy and a method of manufacture |
| WO2006000307A2 (en) * | 2004-06-23 | 2006-01-05 | Wieland-Werke Ag | Corrosion-resistant copper alloy containing magnesium and use thereof |
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Application publication date: 20120208 |