CN102345030A - Antibacterial and corrosion resistant heat exchanger copper pipe - Google Patents
Antibacterial and corrosion resistant heat exchanger copper pipe Download PDFInfo
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- CN102345030A CN102345030A CN2011101748209A CN201110174820A CN102345030A CN 102345030 A CN102345030 A CN 102345030A CN 2011101748209 A CN2011101748209 A CN 2011101748209A CN 201110174820 A CN201110174820 A CN 201110174820A CN 102345030 A CN102345030 A CN 102345030A
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Abstract
The invention relates to an antibacterial and corrosion resistant heat exchanger copper pipe. The copper pipe is characterized by comprising the following materials by weight percent: 0.5-1.2wt% of Sn, 0.05-0.10wt% of P, 2.2-8.5wt% of Al, 1.2-5.0wt% of Ni, 0.5-1.2wt% of Mg, 0.01-0.02% of Ag and the balance Cu and inevitable impurities. The copper alloy material of the invention has good heat resistance; when the prepared copper alloy heat exchanger heat pipe is heated to 750 DEG C, the excellent strength performance can be kept; and the material has good antibacterial property, and the JISZ2801-200 test of the prepared copper alloy material shows that the antibacterial rates of the heat exchanger copper pipe to Escherichia coli and staphylococcus aureus are up to more than 99.8%.
Description
Technical field
The present invention relates to a kind of scatterer heat pipe, the present invention relates to a kind of heat-exchanger brass pipe specifically, it has antibiotic anti-corrosion effect.
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 communicating pores of the radiator element 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 solderability good.Therefore, these characteristics are good, and the deoxidized copper 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 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 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 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 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 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.
Summary of the invention
Above-mentioned purpose in view of the stainless heat exchanger that uses in the prior art exists the purpose of this invention is to provide a kind of heat-exchanger brass pipe, has sufficiently high corrosion resisting property, and has the antimicrobial effect.
To achieve these goals, the present invention has adopted following technical scheme:
A kind of antibiotic anti-corrosion heat-exchanger brass pipe is characterized in that it and is processed by the following material of forming; 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%, Ag:0.01-0.02 wt%, surplus is that Cu and unavoidable impurities constitute.
The meaning and the qualification reason of the alloying constituent of stainless 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 0.50 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 susceptibility 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%.
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%.
Ag
Ag is a kind of good sterilization antimicrobial element that has, and in alloy of the present invention, adds a spot of Ag and promptly can play good antibiotic and sterilizing effect.Ag itself belongs to the ranks of precious metal, costs an arm and a leg, and based on the consideration on the price in the present invention, the content of Ag is no more than 0.02 wt%.In addition, when the content of Ag reached 0.02 wt%, its fungistatic effect basically reached capacity in Cu alloy of the present invention.Thereby in the present invention its content is defined as 0.01-0.02 wt%.
In addition; The invention also discloses the preparation method of above-mentioned heat-exchanger brass 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, Ag 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 30-75 min; Afterwards with alloy liquid at 1150-1250 ℃ of 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-work and/or casting, and prior aries such as for example forging, hot pressing, clod wash processing are processed into heat-exchanger brass pipe.
Heat-exchanger brass pipe 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 is compared with common copper alloy significant raising has also been arranged; In addition, Cu alloy material resistance toheat 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 property; And have good antibacterial property, the Cu alloy material process JIS Z2801-200 test for preparing is shown that heat-exchanger brass pipe of the present invention reaches more than 99.8 % the antibiotic rate of intestinal bacteria, streptococcus aureus.
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, 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, Ag and the Cu of above-mentioned weight percent 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 casting; Then in 800 ℃ of insulation 3 h processings that homogenize, cool off and obtain described Cu alloy material.Be processed into heat-exchanger brass pipe again.
Strength of materials test
In order to measure tensile strength, the materials processing 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-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.
Corrosion-resistant and the antibacterial test of material
Size with 50 * 50 mm cuts out sample respectively, carries out the test of salt-fog test (SWAAT test) and JIS Z2801-2000 anti-microbial property.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.
The test strain of antibacterial test is intestinal bacteria and streptococcus aureus.
Detection method is:
(1) sample is cut into the big or small size of 50.0 * 50.0 mm, sterilization (in triplicate).
(2) on sample, drip some milliliters of bacterium liquid, make colony number maintain 10
5
(3) plastics film is covered specimen surface, put into aseptic plate then, in 36 ± 1 ℃ of constant incubators, cultivate after 24 hours, viable bacteria is counted.
(4) with the ferritic stainless steel of the not argentiferous same model of comparative example 1 as control sample, repeat aforesaid operations.
Antibiotic rate adopts by antibiotic rate=[(A-B)/A] * 100% and calculates, in the formula: the average viable count of control sample after A-24 hour; Antibiotic sample average viable count after B-24 hour.
The chemical ingredients of table 1 mother metal (surplus is Cu and unavoidable impurities)
| Numbering | Sn | P | Ni | Al | Mg | Ag |
| 1 | 0.3 | 0.50 | 1.2 | 2.2 | 0.5 | 0.01 |
| 2 | 0.5 | 0.05 | 1.8 | 3.0 | 1.6 | 0.01 |
| 3 | 0.6 | 0.06 | 2.4 | 3.8 | 0.7 | 0.01 |
| 4 | 0.7 | 0.06 | 3.0 | 4.6 | 0.8 | 0.015 |
| 5 | 0.8 | 0.07 | 3.6 | 5.5 | 0.9 | 0.015 |
| 6 | 1.0 | 0.07 | 4.0 | 6.4 | 1.0 | 0.15 |
| 7 | 1.1 | 0.09 | 4.6 | 7.2 | 1.1 | 0.02 |
| 8 | 1.2 | 0.10 | 5.0 | 8.5 | 1.2 | 0.02 |
Table 2: sample tensile strength, solidity to corrosion and antibacterial effect
| Numbering | Tensile strength | SWAAT test 1000 hours | Antimicrobial efficiency |
| 1 | Very | Very | >99.8 % |
| 2 | Very | Very | >99.8 % |
| 3 | Excellent | Excellent | >99.8 % |
| 4 | Excellent | Excellent | >99.8 % |
| 5 | Excellent | Excellent | >99.8 % |
| 6 | Excellent | Very | >99.8 % |
| 7 | Excellent | Very | >99.8 % |
| 8 | Excellent | Very | >99.8 % |
Claims (6)
1. an antibiotic anti-corrosion heat-exchanger brass pipe is characterized in that it and is processed by the following material of forming; 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%, Ag:0.01-0.02 wt%, surplus is that Cu and unavoidable impurities constitute.
2. the described heat-exchanger brass pipe of claim 1 is characterized in that the content of Sn is: 0.75-1.05 wt%.
3. the described heat-exchanger brass pipe of claim 1 is characterized in that the content of Al is: 3.5-6.5 wt%.
4. the described heat-exchanger brass pipe of claim 1 is characterized in that the content of Al is: 3.5-5.0 wt%.
5. the described heat-exchanger brass pipe of claim 1 is characterized in that the content of Ni is: 1.5-4.2 wt%.
6. the described heat-exchanger brass pipe of claim 1 is characterized in that the content of Mg is: 0.7-1.0 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101748209A CN102345030A (en) | 2011-06-27 | 2011-06-27 | Antibacterial and corrosion resistant heat exchanger copper pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101748209A CN102345030A (en) | 2011-06-27 | 2011-06-27 | Antibacterial and corrosion resistant heat exchanger copper pipe |
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| CN102345030A true CN102345030A (en) | 2012-02-08 |
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| CN2011101748209A Pending CN102345030A (en) | 2011-06-27 | 2011-06-27 | Antibacterial and corrosion resistant heat exchanger copper pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106091747A (en) * | 2016-08-18 | 2016-11-09 | 吴翠莲 | A kind of new type heat exchanger |
| CN106636736A (en) * | 2016-12-19 | 2017-05-10 | 昆山哈利法塔金属有限公司 | Copper alloy material |
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 CN2011101748209A patent/CN102345030A/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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106091747A (en) * | 2016-08-18 | 2016-11-09 | 吴翠莲 | A kind of new type heat exchanger |
| CN106636736A (en) * | 2016-12-19 | 2017-05-10 | 昆山哈利法塔金属有限公司 | Copper alloy material |
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Application publication date: 20120208 |