CN117210725A - Low-heat-conductivity high-pressure casting aluminum alloy capable of being brazed - Google Patents
Low-heat-conductivity high-pressure casting aluminum alloy capable of being brazed Download PDFInfo
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- CN117210725A CN117210725A CN202311216304.7A CN202311216304A CN117210725A CN 117210725 A CN117210725 A CN 117210725A CN 202311216304 A CN202311216304 A CN 202311216304A CN 117210725 A CN117210725 A CN 117210725A
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Abstract
A solderable low-heat-conductivity high-pressure casting aluminum alloy, which comprises the following elements in percentage by mass: up to 0.5 mass% silicon; up to 2 mass% iron; up to 0.3 mass% copper; up to 0.3 mass% zinc; up to 0.85 mass% manganese; up to 0.6 mass% chromium; up to 0.9 mass% magnesium; up to 0.15 mass% titanium; up to 1.5 mass% nickel; 5-15 mass% of rare earth; up to 0.5 mass% molybdenum; the above elements are at least two kinds, and the balance is Al. Solderable low thermal conductivity high pressure casting aluminum alloy with tensile yield limit Rp in as-cast condition 0.2 >100MPa, elongation at break A>5.0% tensile strength Rm>200Mpa coefficient of thermal conductivity<90W/(m.k). The high-pressure casting aluminum alloy with the low heat conductivity coefficient capable of being brazed has the advantages of good casting fluidity and low shrinkage rate on the basis of ensuring that the high-temperature brazing temperature is reached, and can realize the high-pressure casting process.
Description
Technical Field
The invention relates to the technical field of high-pressure casting aluminum alloy, in particular to a low-heat-conductivity high-pressure casting aluminum alloy capable of being brazed.
Background
Brazing refers to a welding method in which a brazing filler metal with a melting point lower than that of a weldment and the weldment are heated to a brazing filler metal melting temperature at the same time, and gaps of solid workpieces are filled with liquid brazing filler metal to connect metals. Because the aluminum alloy has the characteristics of lower heat conduction property, higher strength, light use and economy. Therefore, they are widely used as materials for components of thermal management systems in various fields such as automobiles, industrial machines, and aircrafts.
At present, a plurality of parts are required to be assembled by high-temperature brazing, in particular to a runner plate of a heat management system of a new energy automobile, but a product matrix is mainly welded after deformed aluminum forging and machining, so that the cost is high, the efficiency is low, the existing high-efficiency high-pressure casting aluminum alloy mainly has low melting point and cannot reach the temperature of high-temperature brazing, or the melting point is high, but the casting fluidity is poor, the shrinkage rate is high, and the high-efficiency high-pressure casting aluminum alloy cannot be applied to the existing high-pressure casting process.
Disclosure of Invention
In view of the problems of the prior art, it is an advantage of the present invention to provide a low thermal conductivity, high pressure casting aluminum alloy that is solderable. On the basis of ensuring the high-temperature brazing temperature, the casting fluidity is good, the shrinkage rate is low, and the high-pressure casting process can be realized.
In order to achieve the advantages, the invention provides a low-heat-conductivity high-pressure casting aluminum alloy capable of brazing, which comprises the following elements in percentage by mass:
up to 0.5 mass% silicon; preferably at most 0.2 mass% silicon;
up to 2 mass% iron, preferably up to 0.5 mass% iron;
up to 0.3 mass% copper;
up to 0.3 mass% zinc;
up to 0.85 mass% manganese; preferably at most 0.35 mass% manganese;
up to 0.6 mass% chromium; preferably at most 0.5 mass% chromium;
up to 0.9 mass% magnesium; preferably at most 0.8 mass% magnesium;
up to 0.15 mass% titanium;
up to 1.5 mass% nickel; preferably at most 0.1 mass% nickel;
5-15 mass% of rare earth; the rare earth is preferably one or more of cerium, lanthanum and praseodymium;
up to 0.5 mass% molybdenum; molybdenum preferably at most 0.2 mass%;
and each element contains at least two kinds or more, and the balance is Al.
The brazing low-heat-conductivity high-pressure casting aluminum alloy also comprises the following chemical elements in percentage by mass: 0.1 to 0.5 mass% of zirconium; 0.05 to 0.2 mass% of boron.
Preferably, the solderable low-heat-conductivity high-pressure casting aluminum alloy comprises the following elements in percentage by mass:
up to 0.5 mass% silicon;
up to 0.5 mass% iron;
up to 0.3 mass% copper;
up to 0.3 mass% zinc;
up to 0.85 mass% manganese;
up to 0.6 mass% chromium;
up to 0.8 mass% magnesium;
up to 0.15 mass% titanium;
up to 0.1 mass% nickel;
5 to 15 mass% of cerium;
up to 0.2 mass% molybdenum;
and each element contains at least two kinds or more, and the balance is Al.
Preferably, the solderable low-heat-conductivity high-pressure casting aluminum alloy comprises the following elements in percentage by mass:
up to 0.2 mass% silicon;
up to 2 mass% iron;
up to 0.3 mass% copper;
up to 0.3 mass% zinc;
up to 0.35 mass% manganese;
up to 0.5 mass% chromium;
up to 0.9 mass% magnesium;
0.1 to 0.2 mass% of zirconium;
0.05-0.2 mass% boron;
up to 0.15 mass% titanium;
up to 1.5 mass% nickel;
5 to 15 mass% of lanthanum and praseodymium;
up to 0.5 mass% molybdenum;
and each element contains at least two kinds or more, and the balance is Al.
The brazing low-heat-conductivity high-pressure casting aluminum alloy contains AlFeSi phase and Mg 2 Si phase, (Fe, mn) Al 6 Inclusions, zrAl 3 Inclusion, (CrFe) Al 7 Inclusion, (CrMn) Al 12 Inclusions.
The solderable aluminum alloy with low heat conductivity coefficient is cast at high pressure, and in an as-cast state, the tensile yield limit Rp0.2 is more than 100MPa, the breaking elongation A is more than 5.0 percent, and the tensile strength Rm is more than 200MPa.
In particular, the solderable low thermal conductivity high pressure cast aluminum alloy has a thermal conductivity of < 90W/(m.k), more preferably 80-89W/(m.k).
The melting point of the solderable low-heat-conductivity high-pressure casting aluminum alloy is up to 625 ℃, and the solidus temperature is higher than 630 ℃.
The preparation method of the solderable low-heat-conductivity high-pressure casting aluminum alloy comprises the following steps: weighing raw materials according to the element components of the solderable low-heat-conductivity high-pressure casting aluminum alloy, and carrying out high-pressure casting after smelting.
The invention adds rare earth elements into the high-pressure casting aluminum alloy with low heat conductivity coefficient, which increases the supercooling of components, refines grains, reduces the secondary crystal spacing, reduces the gas and the inclusion in the alloy and leads the inclusion phase to tend to spheroidize when the aluminum alloy is cast. The surface tension of the melt can be reduced, the fluidity is increased, the casting into ingots is facilitated, and the casting process performance is obviously affected.
RE in the alloy is a main eutectic system element, can provide excellent casting performance, and ensures higher eutectic temperature and good high-temperature stability of the material. The eutectic temperature of the material is adjusted by blending different rare earth contents and proportions, and the strength/corrosion resistance/toughness of the material is comprehensively balanced, so that excellent comprehensive service performance and manufacturability are obtained.
According to the invention, when Fe element is added into the high-pressure casting aluminum alloy with a low heat conductivity coefficient capable of brazing, the content of Fe in the high-pressure casting aluminum alloy is 1.0-2.0 mass%, the eutectic point of Fe in the aluminum alloy is 1.8%, the fluidity and demolding capability of the material are ensured by utilizing the eutectic, but the heat conduction of the material is reduced due to the excessively high content of Fe, so that the lower Fe content is preferable, and the maximum content of Fe is preferably 0.5 mass%.
In the invention, silicon element Si is added into a solderable high-pressure casting aluminum alloy with low heat conductivity coefficient, and the effect is as follows: in the conventional aluminum-silicon alloy, silicon mainly improves the flowability of the material, but the alloy mainly relies on Al-Fe eutectic, if excessive silicon is added, the solidus temperature of the material is reduced, the brazing is affected, the silicon and iron form an AlFeSi phase, the elongation of the material is reduced, electron movement is hindered, heat conduction is reduced, and the preferable silicon content is at most 0.2 mass percent;
in the invention, manganese Mn is added into a brazeable low-heat-conductivity high-pressure casting aluminum alloy, and the maximum solubility of manganese in solid solution is 1.82% when the equilibrium phase diagram part of an Al-Mn alloy system is at the eutectic temperature of 658 ℃. The alloy strength is continuously increased along with the increase of the solubility, and when the mass percentage of manganese is 0.8%, the elongation reaches the maximum value. The addition of Mn significantly reduces the electrical and thermal conductivity properties of the aluminum alloy. The Mn element can prevent the recrystallization process of the aluminum alloy, raise the recrystallization temperature and obviously refine the recrystallized grains. The refinement of the recrystallized grains is mainly realized by the inhibition of the growth of the recrystallized grains by MnAl6 compound dispersion particles. Another function of MnAl6 is to dissolve impurity iron to form (Fe, mn) Al6, reducing the detrimental effects of iron.
In the invention, zirconium Zr is added into the solderable low-heat-conductivity high-pressure casting aluminum alloy, and zirconium is also an additive element for refining the grain size commonly used in the aluminum alloy. The addition amount of the ZrAl3 compound is generally 0.1-0.3% in the aluminum alloy, and zirconium and aluminum form the ZrAl3 compound, so that the recrystallization process can be hindered, and the recrystallized grains can be refined. Zirconium also refines the cast structure but is less effective than titanium. In the presence of zirconium, the effect of refining the grains of titanium and boron is reduced. In the Al-Zn-Mg-Cu alloy, zirconium is preferable to be used instead of chromium and manganese for refining the recrystallized structure because zirconium has a smaller influence on quenching sensitivity than chromium and manganese.
The invention adds Cr element into the solderable low-heat-conductivity high-pressure casting aluminum alloy, wherein the solubility of Cr element in aluminum is 0.8 percent at 600 ℃, and the Cr element is basically insoluble at room temperature, thus the electric/heat conductivity of the aluminum alloy is obviously reduced. Chromium forms intermetallic compounds such as (CrFe) Al7, (CrMn) Al12 and the like in aluminum, prevents nucleation and growth processes of recrystallization, has a certain strengthening effect on the alloy, and can improve the toughness of the alloy and reduce the sensitivity of stress corrosion cracking. But the quenching sensitivity is increased in the meeting place, so that the anodic oxide film is yellow.
The invention adds Mg element into the braze-welded aluminum alloy with low heat conductivity coefficient and high pressure casting, when the proportion of Mg in the aluminum alloy is 0.3-1.0 mass%, the Mg can enhance the strength and hardness of the alloy, because the Mg is mainly added into the aluminum-silicon alloy 2 The yield strength can be increased by 5-10 Mpa when 0.1% of magnesium is added to Si phase, the element is obvious for improving the strength of aluminum alloy, and the price and the aluminum difference are small.
The beneficial effects of the invention are as follows:
the low-heat-conductivity high-pressure casting aluminum alloy capable of being brazed can realize die casting production, so that the die casting production can be replaced by forging processing, the precision molding is realized, the utilization rate of aluminum alloy materials is greatly improved, the production process cost is reduced, the production efficiency is high, meanwhile, the low-heat-conductivity high-pressure casting aluminum alloy has a low heat-conductivity and the solidus temperature is higher than 630 ℃, and the brazing can be performed. And a lower thermal conductivity may significantly improve the operating efficiency of the thermal management system.
Drawings
FIG. 1 is a graph of temperature versus solid fraction of a solderable, low thermal conductivity, high pressure casting aluminum alloy prepared in example 1.
Fig. 2 is a graph of temperature versus thermal conductivity for a low thermal conductivity, high pressure casting aluminum alloy that was brazeable in accordance with example 1.
FIG. 3 is a graph of temperature versus solid fraction of a low thermal conductivity high pressure casting aluminum alloy that was brazeable in accordance with example 4.
Fig. 4 is a graph of temperature versus thermal conductivity for a low thermal conductivity, high pressure casting aluminum alloy that was brazeable in accordance with example 4.
FIG. 5 is a graph showing the temperature versus solid fraction of a conventional Al-Si die-cast aluminum alloy material.
Detailed Description
Examples 1 to 3
The high pressure cast aluminum alloys of 3 examples were each produced by the above-described production process, and the properties thereof were examined, and the following table 1 is concrete.
TABLE 1
By casting the temperature and solid fraction and thermal conductivity graphs of the solderable low thermal conductivity high pressure aluminum alloy prepared in example 1, it can be demonstrated that this example produces a lower thermal conductivity product, see in particular figures 1 and 2.
If some of the alloying elements in this example are out of the specified range, the heat conduction properties of the material may be significantly improved, for example, cr element of at most 0.6 is supposed to be reduced to 0, and the heat conduction coefficient of the material is improved to 118W/m.k through experiments, which cannot meet the design goals of the present invention.
Examples 4 to 6
The high pressure cast aluminum alloys of 3 examples were each produced by the above-described production process, and the properties thereof were examined, and the following table 2 is concrete.
TABLE 2
By casting the temperature and solid fraction and thermal conductivity graphs of the solderable low thermal conductivity high pressure aluminum alloy prepared in example 4, it can be demonstrated that this example produces a lower thermal conductivity product, see in particular figures 3 and 4.
Comparative example 1
The difference from example 1 is that the added Si content was 1% by mass and the brazing was impossible.
Comparative example 2
The difference from example 1 is that without adding Cr, the electric/thermal conductivity of the aluminum alloy is reduced.
The invention is a novel brazing aluminum alloy component with low heat conductivity and high pressure casting, can realize die casting production, has lower heat conductivity and solidus temperature higher than 630 ℃ and can be used for brazing. Can replace a forging machine for processing and forming, and has low cost and high production efficiency.
Compared with the conventional Al-Si die-casting aluminum alloy material, the aluminum alloy material has low melting point, can not be welded, and has low heat conductivity coefficient, as shown in figure 5. The novel brazing low-heat-conductivity high-pressure casting aluminum alloy has lower heat conductivity and a melting point as high as 625 ℃, and can be used in a high-temperature brazing process.
The heat conductivity of the solderable low-heat conductivity high-pressure casting aluminum alloy is in the range of 80-89W/(m.k).
It will be appreciated by persons skilled in the art that the embodiments of the invention shown in the foregoing description are by way of example only and are not limiting. The advantages of the present invention have been fully and effectively realized. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.
Claims (10)
1. The low-heat-conductivity high-pressure casting aluminum alloy capable of being brazed is characterized by comprising the following elements in percentage by mass:
up to 0.5 mass% silicon;
up to 2 mass% iron;
up to 0.3 mass% copper;
up to 0.3 mass% zinc;
up to 0.85 mass% manganese;
up to 0.6 mass% chromium;
up to 0.9 mass% magnesium;
up to 0.15 mass% titanium;
up to 1.5 mass% nickel;
5-15 mass% of rare earth;
up to 0.5 mass% molybdenum;
and each element contains at least two kinds or more, and the balance is Al.
2. The solderable low thermal conductivity high pressure casting aluminum alloy of claim 1 wherein the rare earth is one or more of cerium, lanthanum, praseodymium.
3. The solderable low thermal conductivity high pressure casting aluminum alloy of claim 1, further comprising chemical elements and mass percentages thereof: 0.1 to 0.5 mass% of zirconium; 0.05 to 0.2 mass% of boron.
4. The low-heat-conductivity high-pressure casting aluminum alloy capable of being brazed is characterized by comprising the following elements in percentage by mass:
up to 0.5 mass% silicon;
up to 0.5 mass% iron;
up to 0.3 mass% copper;
up to 0.3 mass% zinc;
up to 0.85 mass% manganese;
up to 0.6 mass% chromium;
up to 0.8 mass% magnesium;
up to 0.15 mass% titanium;
up to 0.1 mass% nickel;
5 to 15 mass% of cerium;
up to 0.2 mass% molybdenum;
and each element contains at least two kinds or more, and the balance is Al.
5. The low-heat-conductivity high-pressure casting aluminum alloy capable of being brazed is characterized by comprising the following elements in percentage by mass:
up to 0.2 mass% silicon;
up to 2 mass% iron;
up to 0.3 mass% copper;
up to 0.3 mass% zinc;
up to 0.35 mass% manganese;
up to 0.5 mass% chromium;
up to 0.9 mass% magnesium;
0.1 to 0.2 mass% of zirconium;
0.05-0.2 mass% boron;
up to 0.15 mass% titanium;
up to 1.5 mass% nickel;
5 to 15 mass% of lanthanum and praseodymium;
up to 0.5 mass% molybdenum;
and each element contains at least two kinds or more, and the balance is Al.
6. The low thermal conductivity, high pressure casting aluminum alloy capable of brazing according to any one of claims 1 to 5, wherein said low thermal conductivity, high pressure casting aluminum alloy capable of brazing comprises AlFeSi phase, mg 2 Si phase, (Fe, mn) Al 6 Inclusions, zrAl 3 Inclusion, (CrFe) Al 7 Inclusion, (CrMn) Al 12 Inclusions.
7. The solderable low thermal conductivity high pressure casting aluminum alloy according to any of claims 1 to 5, wherein the solderable low thermal conductivity high pressure casting aluminum alloy has a tensile yield limit rp0.2>100MPa, an elongation at break a >5.0% and a tensile strength Rm >200MPa in as-cast condition.
8. The low thermal conductivity, high pressure casting aluminum alloy that can be brazed according to any of claims 1 to 5, wherein the low thermal conductivity, high pressure casting aluminum alloy that can be brazed has a thermal conductivity of < 90W/(m.k).
9. The low thermal conductivity, high pressure cast aluminum alloy of any of claims 1-5, wherein said low thermal conductivity, high pressure cast aluminum alloy has a thermal conductivity of 80-89W/(m.k).
10. The low thermal conductivity, high pressure casting aluminum alloy according to any of claims 1-5, wherein said low thermal conductivity, high pressure casting aluminum alloy has a melting point of up to 625 ℃ and a solidus temperature of greater than 630 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118792551A (en) * | 2024-09-12 | 2024-10-18 | 苏州慧金新材料科技有限公司 | A high temperature resistant brazable die-casting aluminum alloy and its preparation method and application |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115821127A (en) * | 2022-08-10 | 2023-03-21 | 帅翼驰新材料集团有限公司 | High pressure cast aluminum alloys with improved performance after baking |
| CN116377288A (en) * | 2023-04-10 | 2023-07-04 | 帅翼驰新材料集团有限公司 | High pressure casting aluminum alloy for brazing |
| CN116377262A (en) * | 2023-04-10 | 2023-07-04 | 帅翼驰新材料集团有限公司 | Manufacturing method of high-pressure casting aluminum alloy for brazing |
| CN116377289A (en) * | 2023-04-10 | 2023-07-04 | 帅翼驰新材料集团有限公司 | High pressure cast aluminum alloy suitable for brazing |
| CN116640943A (en) * | 2023-04-10 | 2023-08-25 | 帅翼驰新材料集团有限公司 | Manufacturing method of high-pressure casting aluminum alloy suitable for brazing |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115821127A (en) * | 2022-08-10 | 2023-03-21 | 帅翼驰新材料集团有限公司 | High pressure cast aluminum alloys with improved performance after baking |
| CN116377288A (en) * | 2023-04-10 | 2023-07-04 | 帅翼驰新材料集团有限公司 | High pressure casting aluminum alloy for brazing |
| CN116377262A (en) * | 2023-04-10 | 2023-07-04 | 帅翼驰新材料集团有限公司 | Manufacturing method of high-pressure casting aluminum alloy for brazing |
| CN116377289A (en) * | 2023-04-10 | 2023-07-04 | 帅翼驰新材料集团有限公司 | High pressure cast aluminum alloy suitable for brazing |
| CN116640943A (en) * | 2023-04-10 | 2023-08-25 | 帅翼驰新材料集团有限公司 | Manufacturing method of high-pressure casting aluminum alloy suitable for brazing |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118792551A (en) * | 2024-09-12 | 2024-10-18 | 苏州慧金新材料科技有限公司 | A high temperature resistant brazable die-casting aluminum alloy and its preparation method and application |
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