JPH09310137A - Brazing sheet for heat exchanger fin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brazing sheet for fin capable of low temp. brazing, minimal, accordingly, in the occurrence of buckling of a thin-walled fin member of a heat exchanger during brazing, excellent in characteristics such as thermal conductivity, and capable of recycling the scrap of the heat exchanger made of Al alloy as a raw material for brazing filler metal at the time of producing a new brazing sheet for fins. SOLUTION: An Al alloy, having a composition consisting of, by weight, >0.05-2.5% Si, >0.05-2.0% Fe, and the balance Al with inevitable impurities, is used as a core material. Both sides of this core material are clad with an Al alloy brazing filler metal having a composition consisting of, by weight, >7.0-12.0% Si, >0.4-8.0% Cu, >0.5-6.0% Zn, >0.05-1.2% Mn, >0.05-0.5% Fe, and the balance Al with inevitable impurities.

Description

Description: TECHNICAL FIELD The present invention relates to a fin for a heat exchanger.
Brazing sheet for
Brazing is possible at temperature,
There is little buckling of the thin fin member of the heat exchanger, and the tube
Because it can be brazed together with other high strength materials such as
This makes it possible to reduce the size and weight of the Al alloy heat exchanger.
General aluminum alloy heat exchanger scrap is
When brazing sheet for in
A fine brush for recyclability that can be used as an ingredient
It relates to the aging sheet. 2. Description of the Related Art FIG. 1 shows an example of an Al alloy heat exchanger.
A condenser that is a serpentine type heat exchanger
FIG. Also, Fig. 2 is used for this condenser.
Enlarged perspective view showing an example of an extruded flat multi-hole tube 1 for use
It is. This condenser is a flat tube that is hot or warm.
Bend the multi-hole tube 1 extruded into a serpentine shape,
A collar made of brazing sheet between the multi-hole tubes 1.
The gate fin 2 is attached. Where 3 is
It is a connector corresponding to the inlet and outlet of the refrigerant. these
The components are joined together by brazing.
You. The dimensions of the tube 1 and corrugated fin 2 are
For example, in the case of a condenser (Fig. 1),
22 mm wide x 5 mm high x wall thickness
1.0mm, fin is 22mm wide x 0.15mm thick
In the case of an evaporator (not shown),
Tube (for example, 10 holes) width 80 mm x height 5 mm x meat
Thickness 1.0 mm, fin width 80 mm × thickness 0.13 mm
Tube to reduce the size and weight of the heat exchanger
Both wood and fine wood tend to be thin. For the tube material 1, for example, JIS1050 alloy
(Purity of 99.5wt% or more), JIS3003 alloy (Al-1.2wt% M
n-0.1wt% Cu alloy) or tube material strength improvement
In order to make the potential noble, Cu is added to the 3003 alloy a little.
Alloys with many additions are used. Also the brage
The corrugated fin 2 made of a sealing sheet has Al-M
Zn is added to an n-based or pure Al-based alloy, for example, 1 to 5%
Made into a core material, both sides of which are usually JIS 4045 alloy
(Al-10wt% Si alloy), JIS4343 alloy (Al-8wt% Si alloy)
Clad brazing filler metal such as is used. this
The reason for adding Zn to the core material of the fin is the sacrifice of the fin material.
This is to prevent the tube material from corrosion due to the extreme effect. The brazing sheet referred to here is
Is a plate used for brazing.
A plate in which an Al-Si based brazing material is clad. See you
The brazing sheet is manufactured into a core material and a skin material.
Ingots made by separately melting and casting corroding alloys into alloys with a prescribed alloy composition
Alternatively, a thick plate is hot rolled together, and this is rolled.
Further cold rolling (annealing if necessary) to obtain a specified thickness
It is used as a board. Koruge made of the brazing sheet
Tofu-in 2, tube 1 and connector 3 are with 600 ℃
Heat to a close temperature and contact by brazing.
Although it can be assembled together, the brazing method is
X brazing method, vacuum brazing method, non-corrosive
Non-colon brazing method using other flux
Is done. By the way, in recent years, heat exchangers have become lighter and smaller.
In the direction of, and for that purpose each of the tube material, fin material, etc.
It is desired to reduce the thickness of members. However, for fins
The brazing sheet is thinned by the conventional method.
If this happens, the following problems occur. That is, when brazing
The fins buckle or the wax diffuses and melts in the fin core material.
The thinner the fins, the easier the phenomenon of
You. When the fins buckle, heat exchange due to increased ventilation resistance
The heat efficiency of the converter is reduced. [0007] In addition to the above problems, in recent years
Recyclability of materials is required from the viewpoint of use
became. The heat exchanger for automobiles was removed during disassembly and
Dissolved as gold. But, as above,
The Al alloy heat exchanger manufactured by the
The alloy composition differs for each material, and the average composition of the entire heat exchanger is
It has an odd composition containing a large amount of Mn, Si, Zn, etc.
You. Therefore, the Al alloy produced by the brazing method
Even if the heat exchanger made of gold is melted, it can only be used for castings.
No. In the future, the number of scrapped vehicles will increase, and from a copper heat exchanger to Al
Considering the transition to alloy heat exchangers, etc.
A large amount of scrap of Al alloy heat exchanger consisting of components
New heat exchanger fiber to be manufactured, not for casting
Recycle as a brazing material for brazing sheet
The need for flexible brazing sheets for fins
ing. Al alloy brazing for heat exchangers
The large amount of waste generated at the factory when manufacturing
Since the average composition when this waste is melted is odd,
For each member of ging sheet (core material, brazing material as skin material)
There is a problem that it cannot be developed as a raw material for. In addition,
As a matter of fact, as an example, the conventional Al alloy heat exchanger
For the production of factory scraps during the production of wraps and conventional brazing sheets
The average alloy composition after melting is shown in Table 1. Si (1.8 ~ 2.5w
t (%), Fe (0.2-0.3wt%), Cu (0.1-0.5wt%), Mn
(1.0wt%), Zn (0.3-1.2wt%)
You can see that it is. The object of the present invention is to reduce the temperature.
It is possible to braze once in a while, and with this
In addition, there is little buckling of the thin fin members of the heat exchanger, and
It can be brazed with other low melting point high strength materials such as
As a result, the heat exchanger made of Al alloy can be made smaller and lighter.
A fin breaker that can be realized and has excellent thermal conductivity.
To find a singing sheet. More general Al alloy
Scrap of heat exchanger made from new fins
Can be used as a raw material for brazing filler metal in the production of sheet
Fine brazing sheet with excellent recyclability
To find out. Means for Solving the Problems To solve the above problems
The present invention according to claim 1 provides an S content of more than 0.05 wt% and 2.5 wt% or less.
i, containing more than 0.05 wt% and less than 2.0 wt% Fe with the balance being Al
And an unavoidable impurity as an Al alloy,
Si of more than 7.0 wt% and less than 12.0 wt% on both sides of the core, 0.4 wt%
Over 8.0wt% Cu, 0.5wt% over 6.0wt% Zn,
Mn over 0.05 wt% and under 1.2 wt%, 0.5 wt% over 0.05 wt%
It contains the following Fe and the balance is Al and unavoidable impurities.
Heat exchange characterized by clad Al alloy brazing material
A fining brazing sheet for a converter, wherein the invention according to claim 2 exceeds 0.05 wt%.
Contains less than 2.5wt% Si and more than 0.05wt% and less than 2.0wt% Fe
The core is an Al alloy whose balance is Al and inevitable impurities.
As a material, on both sides of the core material above 7.0 wt% and below 12.0 wt%
Si, more than 0.4wt% and less than 8.0wt% Cu, more than 0.5wt%, 6.0w
t% or less Zn, more than 0.05wt% Mn and 0.05wt% less than 1.2wt%
Over 0.5 wt% Fe and more than 0.3 wt% In
Contains 1 or 2 of Sn of 0.3 wt% or less, and the balance
An Al alloy brazing material consisting of Al and unavoidable impurities
Fins for heat exchangers characterized by being fitted
The invention according to claim 3 is more than 0.05 wt%
Contains less than 2.5wt% Si and more than 0.05wt% and less than 2.0wt% Fe
In addition, Zn exceeding 0.05 wt% and 5.0 wt% or less, 0.002 wt%
In less than 0.3 wt%, Sn over 0.002 wt% and less than 0.3 wt%
It contains 1 or 2 or more types and the balance is Al and is unavoidable
Both sides of the core material are made of Al alloy composed of impurities
In addition, more than 7.0 wt% and 12.0 wt% or less Si, more than 0.4 wt% and 8.0 w
Cu less than t%, Zn over 0.5 wt% and under 6.0 wt%, 0.05 wt%
Over 1.2 wt% Mn, over 0.05 wt% over 0.5 wt% Fe
An Al alloy containing Al and the balance of Al and unavoidable impurities
Flux of heat exchanger characterized by clad gold brazing material
The brazing sheet for in-use, the invention according to claim 4 is more than 0.05 wt%
Includes less than 2.5 wt% Si and more than 0.05 wt% and less than 2.0 wt% FeMn.
In addition, Zn more than 0.05 wt% and 5.0 wt% or less, 0.002 wt%
Over 0.3 wt% In and over 0.002 wt% Sn under 0.3 wt%
Contains one or more of these, with the balance being Al and inevitable
Of an Al alloy, which is made up of specific impurities, as a core material, and
On the surface, more than 7.0 wt% and less than 12.0 wt% Si, more than 0.4 wt% 8.
Cu 0 wt% or less, Zn over 0.5 wt% and 6.0 wt% or less, 0.05 wt%
Over 1.2 wt% Mn and over 0.05 wt% Fe under 0.5 wt%
Containing 0.3% by weight or less of In and 0.3% by weight or less of Sn
Contains 1 type or 2 types, balance Al and unavoidable impurities
And an Al alloy brazing material consisting of
And a brazing sheet for fins of a heat exchanger, wherein the invention according to claim 5 exceeds 0.05 wt%.
Contains less than 2.5wt% Si and more than 0.05wt% and less than 2.0wt% Fe
In addition, Mg exceeding 0.03 wt% and 0.5 wt% or less, 0.03 wt%
Mn 0.6 wt% or less, Cu over 0.03 wt% and 2.5 wt% or less, 0.
Ni over 05wt% and under 2.0wt%, Ni over 0.03wt% and under 0.3wt%
Lower Cr, more than 0.03wt%, less than 0.3wt% Zr, more than 0.03wt%
Includes one or more of 0.3 wt% or less of Ti,
The core material is an Al alloy whose balance consists of Al and unavoidable impurities.
On both sides of the core material above 7.0 wt% and below 12.0 wt%
Si, Cu exceeding 0.4 wt% and 8.0 wt% or less, Cu exceeding 0.5 wt% and 6.0 wt%
Zn less than 0.05wt%, Mn less than 1.2wt% less than 0.05wt%
It contains more than 0.5wt% Fe and the balance is Al.
A special feature is that an Al alloy brazing material consisting of pure material is clad.
The brazing sheet for the fin of the heat exchanger
According to the invention of claim 6, more than 0.05 wt% is exceeded.
Contains less than 2.5wt% Si and more than 0.05wt% and less than 2.0wt% Fe
In addition, Mg exceeding 0.03 wt% and 0.5 wt% or less, 0.03 wt%
Mn 0.6 wt% or less, Cu over 0.03 wt% and 2.5 wt% or less, 0.
Ni over 05wt% and under 2.0wt%, Ni over 0.03wt% and under 0.3wt%
Lower Cr, more than 0.03wt%, less than 0.3wt% Zr, more than 0.03wt%
Includes one or more of 0.3 wt% or less of Ti,
The core material is an Al alloy whose balance consists of Al and unavoidable impurities.
On both sides of the core material above 7.0 wt% and below 12.0 wt%
Si, Cu exceeding 0.4 wt% and 8.0 wt% or less, Cu exceeding 0.5 wt% and 6.0 wt%
Zn less than 0.05wt%, Mn less than 1.2wt% less than 0.05wt%
Over 0.5 wt% Fe, and 0.3 wt% or less In and 0.
Contains 1 or 2 Sn of 3 wt% or less, with the balance being A
of Al alloy brazing material consisting of 1 and unavoidable impurities
Blazing for fins of heat exchangers
The invention according to claim 7 is more than 0.05 wt%
Contains less than 2.5wt% Si and more than 0.05wt% and less than 2.0wt% Fe
And Zn more than 0.05 wt% and 5.0 wt% or less, 0.002 wt%
Over 0.3 wt% In and over 0.002 wt% Sn under 0.3 wt%
Contains 1 or 2 or more of them, and exceeds 0.03wt%
0.5 wt% or less Mg, 0.03 wt% or more and 0.6 wt% or less Mn, 0.03
Cu of more than 2.5% and less than 2.5% by weight, and more than 2.0% of less than 0.05% by weight
Ni, more than 0.03 wt% and less than 0.3 wt% Cr, more than 0.03 wt%
Of Zr less than 0.3 wt% and Ti exceeding 0.03 wt% and less than 0.3 wt%
Contains 1 or 2 or more, with the balance being Al and unavoidable
Both sides of the core material made of Al alloy consisting of pure material
In addition, more than 7.0 wt% and 12.0 wt% or less Si, more than 0.4 wt% and 8.0 w
Cu less than t%, Zn over 0.5 wt% and under 6.0 wt%, 0.05 wt%
Over 1.2 wt% Mn, over 0.05 wt% over 0.5 wt% Fe
An Al alloy containing Al and the balance of Al and unavoidable impurities
Flux of heat exchanger characterized by clad gold brazing material
The brazing sheet for in-use, the invention of claim 8 is more than 0.05 wt%
Contains less than 2.5wt% Si and more than 0.05wt% and less than 2.0wt% Fe
And Zn more than 0.05 wt% and 5.0 wt% or less, 0.002 wt%
Over 0.3 wt% In and over 0.002 wt% Sn under 0.3 wt%
Contains 1 or 2 or more of them, and exceeds 0.03wt%
0.5 wt% or less Mg, 0.03 wt% or more and 0.6 wt% or less Mn, 0.03
Cu of more than 2.5% and less than 2.5% by weight, and more than 2.0% of less than 0.05% by weight
Ni, more than 0.03 wt% and less than 0.3 wt% Cr, more than 0.03 wt%
Of Zr less than 0.3 wt% and Ti exceeding 0.03 wt% and less than 0.3 wt%
Contains 1 or 2 or more, with the balance being Al and unavoidable
Both sides of the core material made of Al alloy consisting of pure material
In addition, more than 7.0 wt% and 12.0 wt% or less Si, more than 0.4 wt% and 8.0 w
Cu less than t%, Zn over 0.5 wt% and under 6.0 wt%, 0.05 wt%
Over 1.2 wt% Mn, over 0.05 wt% over 0.5 wt% Fe
1 of In and 0.3wt% or less of In and Sn of 0.3wt% or less
Seeds or two, with the balance being Al and unavoidable impurities
Characterized by clad with an Al alloy brazing material
Is a fin brazing sheet for a heat exchanger. BEST MODE FOR CARRYING OUT THE INVENTION First, a fin blade according to the present invention.
Core material and skin material (brazing material) that make up the lasing sheet
The concept of deciding the alloying element of is explained. Conde
Fins for aluminum alloy heat exchangers such as sir and evaporator
Of various characteristics of brazing sheet for automobiles
As a result, the most necessary property for lightweight thinning is the fin
High temperature buckling resistance, strength, thermal conductivity, sacrificial effect of fins
Corrosion resistance of the refrigerant passage member is improved. Also other challenges
Is a new aluminum alloy heat exchanger scrap
When brazing sheets for fins are manufactured, the brazing material
It has excellent recyclability that can be used as a raw material.
You. The Al alloy heat exchanger is used for the brazing method.
When it is manufactured by heating, the heating is usually at a temperature near 600 ° C.
Done. This temperature of 600 ℃ is for fin materials
Since the temperature is considerably high, the following three problems occur. Immediately
The fins buckle during heating,
Metal in core alloy that cannot use high-strength alloy with melting point
The intermetallic compound is re-dissolved and the thermal conductivity of the fin is reduced. This
As a method of solving problems such as
Since the temperature is lowered, the above problems are solved for the following reasons. Most of the fin buckling is due to the high temperature of the fin core at high temperature.
Caused by the creep phenomenon. This buckling is around 590 ℃
At a temperature higher than that, it suddenly occurs (fins become weak
). Therefore, if the brazing temperature is 585 ° C or lower, this
Buckling of the fin due to this is less likely to occur. further,
There is buckling due to the diffusion of wax in the fin core.
However, the diffusion of wax is suddenly higher at temperatures around 595 ℃.
It happens suddenly. Therefore, if the brazing temperature is below 585 ℃,
If the wax is less diffused, the buckling of the fins is less likely to occur.
Become. Regarding the strength of the fin, it is added to the high strength Al alloy.
There are elements such as Cu, Mg, Si, etc.
Sacrificial effect, thermal conductivity and brazeability
Must. Therefore, the amount added to improve strength
The number of elements that can increase
Is influential. The amount of Si that can be added by brazing at 600 ℃ is
About 1wt%, but 2.5wt% for brazing below 585 ℃
It is possible to add a certain amount, which allows the fin material to be added.
Can be improved in strength. The thermal conductivity of the fin was precipitated in the Al alloy core material.
Low intermetallic compounds due to re-solid solution during brazing heating
Down. The higher the heating temperature, the larger the solid solubility limit of alloying elements.
And the diffusion rate increases, the re-dissolution progresses.
It will be cool. Therefore, lower the brazing temperature.
Is effective in increasing the thermal conductivity of the fin. The fin brazing sheet of the present invention has such a low
Al alloy brazing material that can be brazed at temperature (585 ° C or less)
Is obtained by clad on both sides of an Al alloy core material. Now, the inventors of the present invention have previously communicated in this way.
Brazing at a temperature lower than the normal brazing temperature (about 600 ° C)
For brazing (Al-Si-Cu-Zn-Fe system)
Alloy) was proposed (Japanese Patent Laid-Open No. 7-24593, etc.). This time
Corrosion material and brazing material used in the present invention (Al-Si-Cu-Zn
-Fe-Mn alloy) is used in the present invention.
Addition of Mn to the brazing filler metal improves the corrosion resistance of the brazing filler metal itself.
Dots and Al alloy produced by brazing sheet
Heat exchanger scraps and brazing sheet mill scraps
However, when manufacturing a new fin brazing sheet,
Considering the recyclability that can be used as the raw material for the brazing material,
That is the point. Below, the brazing for fins according to the present invention
The alloy composition of the brazing filler metal used in
The significance of additional elements and the reasons for limiting the composition range will be described. The present invention
The alloy composition of the brazing filler metal used in is more than 7.0 wt% and 12.0 wt% or less.
Lower Si, more than 0.4 wt% and less than 8.0 wt% Cu, more than 0.5 wt% 6.
Zn below 0wt%, Mn above 0.05wt% and below 1.2wt%, 0.05wt
%, 0.5 wt% or less of Fe, with the balance being Al
Alloy consisting of specific impurities (claims 1, 3, 5, 7
In addition, 0.3 wt% or less of In, 0.3 w
Al alloy with one or two of t% or less Sn added
(Claims 2, 4, 6, 8). [Brazing material relating to claims 1, 3, 5 and 7] Si
Lowers the melting point of the alloy, but if its amount is 7.0wt% or less,
The melting point does not decrease sufficiently and can be brazed at a temperature below 585 ° C.
I can't. Furthermore, if the amount exceeds 12.0 wt%, the melting point
Therefore, brazing cannot be performed at temperatures below 585 ° C.
Therefore, the Si content is more than 7.0 wt% and less than 12.0 wt%.
Since it contains Mn, considering the fluidity of the wax, 8.
It is more preferable that the content is 0 to 11.0 wt%. Cu lowers the melting point of the alloy and improves the fluidity of the wax.
Improve. Here, when the amount of Cu is 0.4 wt% or less, its effect
Is not sufficient and the amount exceeds 8.0 wt%, the pressure of the braze alloy
Spreadability deteriorates, and it is used as a brazing sheet for fins.
Becomes difficult. Therefore, Cu exceeds 0.4 wt% and 8.0 wt% or less.
However, considering the fluidity of wax at low temperature, 1.0 wt%
Add the above, considering the rollability, add 4.0 wt% or less
Is more preferred. The addition of Zn lowers the melting point of the alloy. Further
In the brazing alloy containing Cu as in the present invention,
The potential becomes nobler than the potential of the refrigerant passage components such as tubes.
It is said that the external corrosion progresses in a pit shape and the speed is fast.
There's a problem. The addition of Zn lowers the wax potential,
Position close to the potential of the refrigerant passage component,
To improve the corrosion resistance of the passage constituting member. But the amount
If 0.5 wt% or less, the above effect is not sufficient, and the amount is 6.0 w
If it exceeds t%, the self-corrosion resistance of the solder will decrease and the alloy
Use for brazing sheets for fins with reduced rolling processability
It will not be suitable for trying to stay. Therefore, Zn is 0.5 wt%
Over 6.0wt% but consider the wax fluidity at low temperature
Then, 2.0 wt% or more is added, and considering the rolling property, 5.0 wt% or more is added.
It is more preferable to add below. Mn occurs when the wax solidifies after melting
By using an Mn-based compound as the intermetallic compound,
Improves corrosion resistance. That is, Mn is not added
In alloy, Al-Fe-Si intermetallic compound containing Fe is solidified
Which is the starting point of corrosion.
The inclusion of Mn in the substance changes the characteristics of the intermetallic compound.
And the corrosion resistance is extremely improved. Exerts such an effect
To achieve this, Mn in excess of 0.05 wt% is required, and 1.2 wt%
If it exceeds the range, a coarse Mn-based compound is formed, and it forms as an alloy.
The formability deteriorates and it becomes impossible to process after casting. Therefore, Mn is
It exceeds 0.05 wt% and 1.2 wt% or less, but considering corrosion resistance
0.8w when added over 0.1wt% and considering the fluidity of wax
It is more preferable to add t% or less. Fe is a crystal grain when the wax is solidified after melting.
Has the function of making the fillet finer and increasing the strength of the fillet.
However, if the amount is 0.05 wt% or less, the effect is not fully exerted.
No. Furthermore, as mentioned above, Fe is intermetallicized during solidification.
It forms a compound, which is the starting point of corrosion. Fe content increases
And Fe that does not form a compound with Mn is generated. Therefore, the Fe content is
0.05 wt% from the balance of grain refinement effect and corrosiveness
Over 0.5wt% but the upper limit is due to corrosion resistance.
0.2 wt% or less is more desirable. [Brazing material relating to claims 2, 4, 6, 8]
Above are the essential additional elements of the brazing filler metal according to the present invention.
However, in the brazing filler metal, In and Sn may be added if necessary.
In some cases. In and Sn base the wax potential on this
The sacrificial anode effect improves the corrosion resistance of the refrigerant passage components.
Let In other words, to help the effect of Zn in the brazing material,
Add within 0.3 wt% or less. The amount exceeds 0.3 wt%
If so, the rolling workability of the alloy decreases. The more preferable range is
Each is 0.01 to 0.3 wt%. In and Sn are
One type or two types are added within the range. Next, the fin brazing sheet of the present invention
Inevitable impurities in the brazing filler metal of Ni, Cr, Zr, Ti,
There are Mg etc. Ni is an element that enhances the strength of alloys for heat exchangers
The element that has recently been used as a heat exchanger made of Al alloy
Can not be ignored when recycling the scrap of brazing material
It is an element. Since the characteristics of Ni are almost the same as those of Fe,
Ni as an unavoidable impurity is especially problematic if it is 0.5 wt% or less.
Absent. In addition, Cr, Zr, Ti, Mg, etc. as unavoidable impurities
Are not particularly problematic if each is 0.30 wt% or less. In the brazing sheet for fins of the present invention
Another characteristic of the brazing filler metal is the alloy in consideration of recyclability.
In composition. Parts used in conventional Al alloy heat exchangers
For the alloying element of the material, a sacrificial anode effect such as with a fin is added.
For Zn, Si contained in a large amount in brazing filler metal, strength for core material
There are Cu, Mn etc. for the above. And the heat made of the Al alloy
Exchanger scrap contains all of these alloying elements.
Therefore, a new brazing sheet that serves as a heat exchanger member
It cannot be used as a raw material for gypsum (particularly brazing material).
Was. After all, the scrap of Al alloy heat exchanger is for casting
Used as raw materials, but these are recycled
From the viewpoint of resource saving, the Al alloy heat exchanger scrubber
From the top, a new brazing blade that becomes a heat exchanger member
Real recycling as raw material for steel (especially brazing material) is desired
Good. For use with the fin brazing sheet of the present invention
The alloying elements of the brazing filler metal are Si, Cu, Zn, Mn, Fe, and I
n, Sn, which is manufactured by the conventional brazing method A
l Alloys containing elements normally added to heat exchanger components
All included (see Table 1). That is, the fiber of the present invention
The brazing material for the brazing sheet for
L alloy heat exchanger scrap becomes heat exchanger member
When manufacturing a new brazing sheet for fins,
An alloy that can be recycled as a raw material for brazing filler metal
You. The factory of the brazing sheet for fins of the present invention
Factory waste generated during production is also recycled into this brazing filler metal.
Is possible. Next, the brazing sheet for fins of the present invention
The alloy composition of the core material used for the alloy is described below. In the present invention
The core material used is more than 0.05 wt% and less than 2.5 wt% Si, 0.05 wt%
%, 2.0 wt% or less of Fe, and balance cannot be Al
Al alloy consisting of evasive impurities (claims 1 and 2),
In addition to the core material according to claim 1, more than 0.05 wt% 5.
Zn below 0 wt%, In exceeding 0.002 wt% and below 0.3 wt%, 0.00
One or two or more Sn exceeding 2 wt% and 0.3 wt% or less
Al alloy containing (claims 3 and 4), and
The core material according to claim 1, further comprising more than 0.03 wt% and 0.5 wt% or less.
Lower Mg, over 0.03wt% Mn under 0.6wt%, over 0.03wt%
2.5 wt% or less Cu, 0.05 wt% to 2.0 wt% or less Ni, 0.
Cr over 03wt% and under 0.3wt%, Cr over 0.03wt% and under 0.3wt%
One of the following Zr, Ti exceeding 0.03wt% and 0.3wt% or less
Is an Al alloy containing two or more kinds (claims 5 and 6).
), And the core material according to claim 1, further comprising 0.05 wt%
Over 5.0 wt% and Zn over 0.002 wt% and under 0.3 wt%
In, 1 type out of 0.002 wt% to 0.3 wt% Sn or
More than 2 kinds and Mg more than 0.03wt% and less than 0.5wt%, 0.03wt%
Over 0.6 wt% Mn, over 0.03 wt% C over 2.5 wt% Cn
u, more than 0.05wt% and less than 2.0wt% Ni, more than 0.03wt% 0.3
Cr less than wt%, Zr exceeding 0.03 wt% and less than 0.3 wt%, 0.03 wt%
More than 0.3wt% and less than 1wt% of Ti
It is an Al alloy (claims 7 and 8). The significance of the elements added to the core alloy will be described below.
And the reason for limiting the range of addition will be described. [Core material related to claims 1 and 2] Core material related to claims 1 and 2
Is an Al-Si-Fe alloy core material. Si contributes to strength improvement
You. If the Si content is 0.05 wt% or less, the effect is not sufficient and 2.5 w
If it exceeds t%, the melting point decreases, and the brazing filler metal of the present invention is used.
Also melts during brazing. Therefore, Si is 0.05 wt
% To 2.5 wt% or less, but considering the strength, 0.5 wt%
The above is more desirable, 1.0 wt% or less considering thermal conductivity
Is more desirable. Fe forms an intermetallic compound and improves strength.
To contribute. If the amount is 0.05 wt% or less, the effect is sufficient.
If it exceeds 2.0 wt%, the fin core material during brazing
Recrystallized grains become finer and the diffusion of Si in the brazing material increases.
The fins are easily crushed. Therefore, Fe exceeds 0.05 wt%.
2.0 wt% or less. [Core Material Related to Claims 3 and 4] Al-Si-Fe Alloy
Al alloy core material in which Zn, In, and Sn are further added to the core material.
You. Adding Zn, In and Sn is a sacrificial anodic effect on the fin material.
This is to give the fruit. Zn less than 0.05 wt%, 0.002 wt
% Or less In, 0.002 wt% or less Sn, the above effect is sufficient
Not, Zn over 5.0 wt%, In over 0.3 wt%, Over 0.3 wt%
If Sn is added, the thermal conductivity will decrease. Therefore, Z
n, In, and Sn are more than 0.05 wt% and 5.0 wt% or less Zn, 0.002 w
In over t% and 0.3 wt% or less, S over 0.002 wt% and 0.3 wt% or less
One or more of n are added. [Core Material Related to Claims 5 and 6] Al-Si-Fe Alloy
For core material, if necessary, Mg, Mn, Cu, Ni, Cr, Zr, Ti
This is an Al alloy core material to which one or more of are added. this
To add more strength to the fin material
This is because. 0.03wt% or less of Mg, Mn, Cu, Cr, Zr, Ti,
If the Ni content is 0.05 wt% or less, the effect is not obtained. In addition, 0.5 wt%
The excess Mg is in the case of using potassium fluoride flux.
If so, the brazing property is reduced. Mn exceeding 0.6 wt% has thermal conductivity
Is reduced. Cu exceeding 2.5 wt% will increase the fin potential.
To reduce the sacrificial effect. Ni over 0.3wt% and 0.3w
For Cr, Zr, and Ti that exceed t%, corrugating fins is difficult.
It will be difficult. Therefore, Mg, Mn, Cu, Ni, Cr, Zr, Ti is 0.
Mg over 03wt% and under 0.5wt%, over Mg over 0.03wt% and under 0.6wt%
Lower Mn, over 0.03wt%, Cu under 2.5wt%, over 0.05wt%
2.0 wt% or less of Ni, 0.03 wt% or more and 0.3 wt% or less of Cr, 0.
Zr over 03wt% and under 0.3wt%, over Zr 0.03wt% and under 0.3wt%
Add one or more of the following Tis as needed.
Add [Core Material Related to Claims 7 and 8] Al-Si-Fe Alloy
In addition to the core material, one or more of Zn, In and Sn and Mg,
Add one or more of Mn, Cu, Ni, Cr, Zr, Ti
Al alloy core material. Reasons for these additions and their scope
The reason for the limitation is the same as above. The above is used in the present invention
This is an explanation of the additional elements of the core alloy,
As an unavoidable impurity element, it is necessary to refine the ingot structure.
B added, V added for the purpose of improving strength, etc.
However, if each of them is 0.05 wt% or less,
It does not matter if it is. The brazing sheet for fins of the present invention (contract
The requirements 1 to 8) are the above-mentioned Al depending on the purpose of use and application.
Selectively combine the alloy core material and the above Al alloy brazing material
The brazing material is clad on both sides of the core material. Book
The plate thickness of the brazing sheet for fins of the invention has the above-mentioned theoretical value.
Due to the reason, it can be made thinner than the conventional one, and 0.0 depending on the application.
It can be 8 to 0.12 mm. Brazing material
Derate is about 5 to 15% of the total plate thickness on one side.
Change more. Generally, the thicker the plate, the smaller it becomes. Book
The tempering of the inventive brazing sheet for fins is specified
do not do. Considering formability etc., H1n material, H2n material,
Alternatively, it may be appropriately selected from H3n materials and the like. The fin brazing sheet of the present invention comprises:
Mainly used for manufacturing Al alloy heat exchangers. here
The Al alloy heat exchanger referred to in is a condenser, an evaporator.
Radiators, radiators, heaters, oil coolers, etc.
However, the present invention is not limited to these. Of the present invention
Heat exchangers are mainly used for brazing sheets for fins
However, it can also be used for other purposes. The fin brazing sheet of the present invention comprises:
Recommended brazing temperature above 570 ° C and below 585 ° C
I do. The reason is that when the brazing temperature is 570 ° C or lower,
The brazing material of the invention does not melt compositionally and cannot be brazed
It is. If the temperature exceeds 585 ° C, fin brazing
Thermal conductivity of the core material of the sheet decreases and buckling resistance at high temperature
This is because the Furthermore, it contains a large amount of Si, Cu, etc.
Other refrigerant passage structure made of high strength alloy with low melting point
This is because the component cannot be used. In addition, like this
By lowering the brazing temperature, the life of the brazing furnace is extended.
The effect of being vibrated is also obtained. Here, the brazing blade for fins of the present invention is used.
The brazing temperature is limited, but other
The brazing condition may be almost the same as the conventional one. That is,
Lux brazing method, vacuum brazing method, non-corrosion
Non-colon brazing method using a magnetic flux
Any brazing method such as can be applied. Assembly before brazing
Cleaning, and flux coating if necessary
Just go. In this case, the flux is, for example, cesium-based.
If you use the flux of
Brazing is possible at temperatures below 585 ℃. Brazing
The subsequent steps are not particularly limited. Has been done from the past
Aging treatment, flux removal, painting, etc.
No. The production of the brazing sheet for fins of the present invention is
The core material and the brazing filler metal, which are the skin materials described above, are separately prepared in the prescribed alloy composition
Melted and cast into an alloy ingot to form an ingot or a thick plate.
And then cold rolling (if necessary
Annealed) to a plate with a specified thickness (limited to this
However, for example, it is about 0.08 to 0.12 mm)
You. The skin material of the brazing sheet for fins of the present invention
Conventional brazing alloys (Al-Si-Cu-Zn-Mn-Fe alloys) are
Heat exchanger made of Al alloy manufactured from brazing sheet
Of scraps and brazing sheets at the factory
Factory waste generated (fining brazing sheet of the present invention
(Including factory scrap of). Immediately
Then, these scrap alloys are brazing materials for fins of the present invention.
It can be recycled into the brazing material Al alloy of the sheet. EXAMPLES Below, a blazing resin for fins according to the present invention
Compared with the comparative example and the conventional example,
Explain physically. As an example of scrap material, it is produced during factory production.
Of brazing sheet scrap and aluminum alloy heat exchanger
Table 1 shows the average alloy composition obtained by melting and casting scrap.
You [Table 1] In Table 1, the fin brazing sheet
Factory waste is mainly composed of Al-Mn-Zn alloy core materials.
On both sides, as a brazing material, an Al-Si alloy skin material
It is factory scrap such as brazed sheets that have been removed. tube
The brazing sheet for industrial use is mainly made of Al-Mn-
One side of the Cu-based alloy core material, Al-Si-based as a brazing material
Alloy, clad with Al-Zn alloy as sacrificial material on other surface
Factory scraps such as brazed sheets. Heat exchange
The converter scrap is an Al alloy radiator,
On one surface of the core material of the Mn-Cu alloy, Al-
Si-based alloy and Al-Zn-based alloy as a sacrificial material on the other side.
Lad tube material, header material and Al-Mn-Zn
It is composed of a fin material of a system alloy and others. The scrap alloys (No. 1, 2, 3) shown in Table 1 are
Compounded and melt-cast with brazing alloy materials of various compositions shown in Table 2.
I made it. In addition, the brazing alloy material No. A to J, M, N
Uses the above scrap material, adds Al ingot, and
i, Cu, Zn, etc. are further added to obtain a predetermined alloy composition.
did. Part of the comparative examples in Table 2 (No. K, L) and conventional alloys
In the production of (No. O, P), the above-mentioned waste is related in relation to the waste composition.
The material could not be used. In addition, unavoidable for brazing alloy materials
Elements such as Cr, Zr, and Ti are included as mechanical impurities in an amount of 0.03 wt% or less.
Ni is 0.15 wt% in the alloy materials B, C and F.
It is contained below. Of these braze alloy sheets that will be the skin material
Manufacturing is DC casting, chamfering, homogenization, hot rolling
It was carried out by a conventional method. [Table 2] Next, the brazing alloy plate obtained is shown in Table 3
Match both sides of the alloy ingot, heat it, and hot roll
Clad with a hot-rolled sheet, which is then
Cold-rolled and annealed to a specified thickness and temper, then applied to both sides.
Use a brazing sheet for fins that is clad with brazing material.
Manufactured. The composition of the core alloy ingot is shown in Table 3, and brazing is performed.
Table 4 shows the structure of the sheet. The obtained brazing for fins
The sealing sheet is an H14 tempered material having a plate thickness of 0.10 mm. Wax
The clad ratio of the material was 10% of the total plate thickness on one side. [Table 3] [Table 4] The brazing blade for fins having a thickness of 0.10 mm
For the table, N under the conditions shown in Table 4 _Two Brazing in gas
After heating, measure the conductivity, judge the collapse of the fin,
The formation of let was judged. The conductivity of the fin is measured by the above-mentioned fin.
I went to the brazing sheet. Fin conductivity
Is an index of thermal conductivity, and if conductivity is high, thermal conductivity
And the fin conductivity increases by 5% IACS,
The heat efficiency of the exchanger is improved by about 1%. Crushed fin
The thickness is 0.10 mm and the temper is H
Corrugated 14 fin brazing sheet
The upper and lower plates of the 3003 alloy with a thickness of 0.30 mm (Al-1.2 wt% Mn-0.
15wt% Cu alloy) plate and assembled into a single-stage core
Then, the assembled core is
Liquid containing 10% concentration _Two In gas
It was heated and brazed. The brazing temperature is also shown in Table 4.
Was. For the core after brazing, check the appearance by observing the appearance.
The crushing condition and fillet forming condition were investigated. this
The results are shown in Table 5. In addition, heat exchange made of Al alloy in Table 1
The scraps of the vessel and the scraps of the brazing sheet are
Inventive and conventional brazing sheets for fin brazing sheets
Whether it can be reused as an alloy (recyclability)
However, it is shown in Table 5 for reference. [Table 5] As is clear from Table 5, the fibers of the present invention are
Brazing sheet (N0.1-13) for brazing
The fillet formation after heating is good, and
Since the brazing temperature can be lowered, thin fins (Example
Of 0.10 mm), but when brazing
The fins are not crushed and the conductivity is good. In addition,
Conventional brazing sheet for fins has a thickness of 0.15 mm
The brazing sheet for fins of the present invention
It was also confirmed that can be considerably thinned. Also,
Brazing sheet for fins (N0.1-13)
Is a mixture of a brazing filler metal of the sheet and a scrap material.
However, the condition of fillet formation after low temperature brazing is good.
Therefore, the effective utilization of resources by recycling scraps to the brazing material
It was proved that it can also be used. On the other hand, in Comparative Example No. 14, 15
The brazing sheet of contains Mn or Cu in the brazing material.
Could not be recycled because it is not
Could not be blended). In addition, No. 15 braces
The melting point of the wax is
Rises, brazeability decreases and fillets are well formed
Had not been. No. 16 and 17 brazing sheets
Is a composition different from the brazing material composition of the present invention.
It is possible to recycle the waste material into. However, no. 16
In the brazing sheet of, the amount of Si in the brazing material is the
Since it is less than the range, the melting point of the brazing material is high and the brazing property is high.
And the fillet was not sufficiently formed, and No.
The brazing sheet of No. 17 has the Mn content of the brazing filler metal of the present invention.
Since the amount of wax exceeds the limited range, the fluidity of wax decreases,
No dots formed. In addition, No. 18-20 brazing blades
Is an example of using a conventional brazing filler metal.
Since it does not contain n, Cu, or Zn, scrap material is replaced with brazing material.
I can't cycle. In addition, No. 18 brazens
As the brazing temperature is 580 ° C,
No. 19 and 20 brazing
Since the brazing temperature is 600 ° C,
Is melting or crushing. In addition, the conventional example No.
21 is a conventional Al-Si-Fe alloy brazing filler metal and a conventional high brazing filler metal.
A brazing sheet for fins using a Mn-containing core material
This is an example of low conductivity. As described above in detail, the flux according to the present invention is
Brazing sheet for in can be brazed at low temperature
And the thin fins of the heat exchanger being brazed
There is little buckling of the member, low melting point of other materials such as tube material, and
Since it can be brazed together with high strength members,
The size and weight of the gold heat exchanger can be reduced. General A
l Alloy heat exchanger scraps and factory-generated blur
The waste of the aging sheet is a new fin blade according to the present invention.
As a brazing filler metal when manufacturing lasing sheets
Remarkable industrial effects such as usable and excellent recyclability
Is played.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a serpentine type capacitor. FIG. 2 is an enlarged perspective view showing an example of the extruded flat multi-hole tube shown in FIG. [Explanation of Codes] Extruded flat multi-hole tube 2. Fin 3. connector

Claims (1)

[Claims] [Claim 1] Si exceeding 0.05 wt% and 2.5 wt% or less, 0.05 wt
% And 2.0 wt% or less of Fe and the balance of Al and Al inevitable impurities as the core material, and on both sides of the core material, more than 7.0 wt% and 12.0 wt% or less Si, 0.4 wt Over 8.0%
Cu less than t%, Zn over 0.5 wt% and under 6.0 wt%, Mn over 0.05 wt% and under 1.2 wt%, Fe over 0.05 wt% and under 0.5 wt% and the balance is Al. A brazing sheet for fins of a heat exchanger, characterized in that an Al alloy brazing material containing impurities is clad. 2. Si more than 0.05 wt% and 2.5 wt% or less, 0.05 wt
% And 2.0 wt% or less of Fe and the balance of Al and Al inevitable impurities as the core material, and on both sides of the core material, more than 7.0 wt% and 12.0 wt% or less Si, 0.4 wt Over 8.0%
Cu less than t%, Zn over 0.5wt% and under 6.0wt%, Mn over 0.05wt% and under 1.2wt%, Fe over 0.05wt% and under 0.5wt%, and 0.3wt% under 1 of In and Sn of 0.3 wt% or less
A brazing sheet for fins of a heat exchanger, characterized in that a brazing material of Al alloy containing 1 or 2 kinds and the balance of Al and unavoidable impurities is clad. 3. Si more than 0.05 wt% and 2.5 wt% or less, 0.05 wt
%, 2.0 wt% or less of Fe, and more than 0.05 wt%
5.0 wt% or less Zn, 0.002 wt% or more and 0.3 wt% or less In, 0.00
An Al alloy containing 1 type or 2 types or more of Sn exceeding 2 wt% and 0.3 wt% or less, and the balance being Al and unavoidable impurities is used as a core material, and 7.0 wt% is applied to both surfaces of the core material. Over 12.0wt
% Or less, 0.4 wt% or more and 8.0 wt% or less of Cu, 0.5 wt% or more and 6.0 wt% or less of Zn, 0.05 wt% or more and 1.2 wt% or less of Mn, 0.
A brazing sheet for a fin of a heat exchanger, characterized by containing an Al alloy brazing material containing more than 05 wt% and 0.5 wt% or less of Fe and the balance being Al and inevitable impurities. 4. Si more than 0.05 wt% and 2.5 wt% or less, 0.05 wt
%, 2.0 wt% or less FeMn, further 0.05 wt% to 5.0 wt% or less Zn, 0.002 wt% to 0.3 wt% or less In, 0.
Al containing more than 002 wt% and less than 0.3 wt% Sn, one or more, and the balance being Al and inevitable impurities
Alloy is used as core material, and both sides of the core material exceed 7.0wt% and 12.0
wt% or less Si, 0.4 wt% or more and 8.0 wt% or less Cu, 0.5 wt% or more and 6.0 wt% or less Zn, 0.05 wt% or more and 1.2 wt% or less Mn,
It contains more than 0.05 wt% and 0.5 wt% or less of Fe, 1 or 2 types of In of 0.3 wt% or less and Sn of 0.3 wt% or less, and the balance is Al and unavoidable impurities. A brazing sheet for fins of a heat exchanger, characterized by being clad with an Al alloy brazing material. 5. Si more than 0.05 wt% and 2.5 wt% or less, 0.05 wt
%, 2.0 wt% or less of Fe, and more than 0.03 wt%
0.5 wt% or less Mg, 0.03 wt% or more and 0.6 wt% or less Mn, 0.03
Cu over 2.5 wt% and over 2.5 wt%, Ni over 0.05 wt% and under 2.0 wt%, Cr over 0.03 wt% and under 0.3 wt%, over 0.03 wt%
An Al alloy containing Zr of 0.3 wt% or less and Ti of 0.03 wt% or more and 0.3 wt% or less and 0.3 wt% or less, with the balance being Al and unavoidable impurities as a core material, Si on both sides of more than 7.0 wt% and 12.0 wt% or less, and over 0.4 wt% 8.0w
Contains t% or less Cu, 0.5% to 6.0% by weight Zn, 0.05% to 1.2% by weight Mn, 0.05% to 0.5% by weight Fe, and balance Al. A brazing sheet for fins of a heat exchanger, characterized by being clad with an Al alloy brazing filler metal containing a specific impurity. 6. Si of more than 0.05 wt% and 2.5 wt% or less, 0.05 wt
%, 2.0 wt% or less of Fe, and more than 0.03 wt%
0.5 wt% or less Mg, 0.03 wt% or more and 0.6 wt% or less Mn, 0.03
Cu over 2.5 wt% and over 2.5 wt%, Ni over 0.05 wt% and under 2.0 wt%, Cr over 0.03 wt% and under 0.3 wt%, over 0.03 wt%
An Al alloy containing Zr of 0.3 wt% or less and Ti of 0.03 wt% or more and 0.3 wt% or less and 0.3 wt% or less, with the balance being Al and unavoidable impurities as a core material, Si on both sides of more than 7.0 wt% and 12.0 wt% or less, and over 0.4 wt% 8.0w
Cu less than t%, Zn over 0.5wt% and under 6.0wt%, Mn over 0.05wt% and under 1.2wt%, Fe over 0.05wt% and under 0.5wt%, and 0.3wt% under 1 of In and Sn of 0.3 wt% or less
A brazing sheet for fins of a heat exchanger, characterized in that a brazing material of Al alloy containing 1 or 2 kinds and the balance of Al and unavoidable impurities is clad. 7. Si of more than 0.05 wt% and 2.5 wt% or less, 0.05 wt
%, 2.0 wt% or less of Fe, and 0.05 wt% or more and 5.0 wt% or less Zn, 0.002 wt% or more and 0.3 wt% or less In, 0.
Includes one or more Sn of more than 002wt% and 0.3wt% or less, and further contains Mg of 0.03wt% or more and 0.5wt% or less, 0.03wt
% Over 0.6 wt% Mn, over 0.03 wt% over 2.5 wt%
Cu, more than 0.05 wt% and less than 2.0 wt% Ni, more than 0.03 wt% 0.
Cr below 3wt%, Zr above 0.03wt% and below 0.3wt%, 0.03wt
%, And 0.3 wt% or less of Ti, one or more of Ti is contained, and the balance is Al alloy consisting of Al and unavoidable impurities as a core material, and more than 7.0 wt% on both sides of the core material. 12.0wt%
Si below 0.4wt% over 8.0wt% Cu below 0.5wt%
Zn below 6.0wt%, Mn above 0.05wt% and below 1.2wt% 0.05
A brazing sheet for fins of a heat exchanger, characterized by containing an Al alloy brazing material containing more than 0.5 wt% and less than 0.5 wt% Fe and the balance being Al and inevitable impurities. 8. Si of more than 0.05 wt% and 2.5 wt% or less, 0.05 wt
%, 2.0 wt% or less of Fe, and 0.05 wt% or more and 5.0 wt% or less Zn, 0.002 wt% or more and 0.3 wt% or less In, 0.
Includes one or more Sn of more than 002wt% and 0.3wt% or less, and further contains Mg of 0.03wt% or more and 0.5wt% or less, 0.03wt
% Over 0.6 wt% Mn, over 0.03 wt% over 2.5 wt%
Cu, more than 0.05 wt% and less than 2.0 wt% Ni, more than 0.03 wt% 0.
Cr below 3wt%, Zr above 0.03wt% and below 0.3wt%, 0.03wt
%, And 0.3 wt% or less of Ti, one or more of Ti is contained, and the balance is Al alloy consisting of Al and unavoidable impurities as a core material, and more than 7.0 wt% on both sides of the core material. 12.0wt%
Si below 0.4wt% over 8.0wt% Cu below 0.5wt%
Zn below 6.0wt%, Mn above 0.05wt% and below 1.2wt% 0.05
It contains more than 0.5 wt% and less than 0.5 wt% Fe.
A brazing sheet for fins of a heat exchanger, characterized by containing one or two kinds of In and 0.3 wt% or less of Sn, and the remainder being a clad with an Al alloy brazing material composed of Al and unavoidable impurities.