KR20240080659A - Manufacturing method of die casting Al alloy - Google Patents

Abstract

The present invention is a method for manufacturing a die-casting aluminum alloy, wherein the aluminum alloy is formed by adding pure aluminum or commercially available aluminum alloy to aluminum scrap, and the composition of the aluminum alloy is 5.0 wt% to 8.0 wt%. wt% Si, 0.05 wt% to 0.5 wt% Fe, 0.01 wt% to 0.5 wt% Cu, 0.001 wt% to 0.1 wt% Mn, 0.05 wt% to 1.0 wt% Mg, 0.001 wt% to 0.1 wt% It contains wt% Zn, and the balance may contain Al and other inevitable impurities.

Description

Manufacturing method of die casting Al alloy}

The present invention relates to a method of manufacturing a die-casting aluminum alloy, and more specifically, to a method of manufacturing a die-casting aluminum alloy having excellent high heat dissipation properties.

As a method of manufacturing products from aluminum alloy, die casting method is generally used the most. The die casting method causes gas to be mixed into the product during the process, causing defects in the product. Accordingly, there was a problem in that the elongation rate was lowered. In addition, these aluminum die casting alloys have low heat dissipation properties, which limits the expansion of their application range.

Aluminum alloys such as ALDC12, the most commonly used alloy among conventional aluminum alloys, are lagging behind market demands for heat dissipation efficiency due to miniaturization and integration of electronic components. The ALDC 12 alloy has a thermal conductivity value of 96.2 W/mK, which is a value that cannot satisfy the recently required high heat dissipation properties.

Recently, the development of alloys to satisfy these high heat dissipation characteristics has been continuously researched. Although it can improve mechanical strength and heat dissipation efficiency, it has the problem of significantly poor fluidity and requires the use of expensive pure metal. .

Korean Patent No. 10-1641170

Conventionally, alloy compositions have been developed to satisfy high heat dissipation characteristics, but this does not solve the problem of reduced fluidity, and there is a problem that expensive metals must be used to prevent this as much as possible. The present invention is intended to solve various problems including the problems described above, and its purpose is to provide a method for manufacturing a die-casting aluminum alloy that is easy to use commercially without using expensive metal. However, these tasks are illustrative and do not limit the scope of the present invention.

According to one embodiment of the present invention, a method for manufacturing die casting aluminum alloy is provided. The method of manufacturing the die casting aluminum alloy is formed by adding pure aluminum or commercially available aluminum alloy to aluminum scrap, and the composition of the aluminum alloy is 5.0 wt% to 8.0 wt% Si, 0.05 wt % to 0.5 wt% Fe, 0.01 wt% to 0.5 wt% Cu, 0.001 wt% to 0.1 wt% Mn, 0.05 wt% to 1.0 wt% Mg, 0.001 wt% to 0.1 wt% Zn; , the remainder may contain Al and other inevitable impurities.

According to another embodiment of the present invention, a method for manufacturing die casting aluminum alloy is provided. The method of manufacturing the die casting aluminum alloy is formed by adding pure aluminum or commercially available aluminum alloy to aluminum scrap, and the composition of the aluminum alloy is 5.0 wt% to 8.0 wt% Si, 0.05 wt % to 0.5 wt% Fe, 0.5 wt% to 2.0 wt% Cu, 0.001 wt% to 0.1 wt% Mn, 0.05 wt% to 1.0 wt% Mg, 0.001 wt% to 0.1 wt% Zn; , the remainder may contain Al and other inevitable impurities.

According to another embodiment of the present invention, a method for manufacturing die casting aluminum alloy is provided. The method of manufacturing the die casting aluminum alloy is formed by adding pure aluminum or commercially available aluminum alloy to aluminum scrap, and the composition of the aluminum alloy is 5.0 wt% to 8.0 wt% Si, 0.05 wt % to 0.5 wt% Fe, 0.01 wt% to 0.5 wt% Cu, 0.001 wt% to 0.1 wt% Mn, 0.05 wt% to 1.5 wt% Mg, 0.001 wt% to 0.1 wt% Zn; , the remainder may contain Al and other inevitable impurities.

According to another embodiment of the present invention, a method for manufacturing die casting aluminum alloy is provided. The method of manufacturing the die casting aluminum alloy is formed by adding pure aluminum or commercially available aluminum alloy to aluminum scrap, and the composition of the aluminum alloy is 5.0 wt% to 8.0 wt% Si, 0.05 wt % to 0.5 wt% Fe, 0.5 wt% to 1.0 wt% Cu, 0.001 wt% to 0.1 wt% Mn, 0.05 wt% to 1.0 wt% Mg, 0.001 wt% to 0.1 wt% Zn; , the remainder may contain Al and other inevitable impurities.

In the method of manufacturing the die casting aluminum alloy, the aluminum alloy includes 0.001 wt% to 0.15 wt% of Ti, 0.001 wt% to 0.1 wt% of Ca, 0.001 wt% to 0.1 wt% of Sn, and 0.001 wt% to 0.1 wt%. % of P, 0.001 wt% to 0.1 wt% of Cr, 0.001 wt% to 0.1 wt% of Zr, 0.001 wt% to 0.1 wt% of Ni, and 0.001 wt% to 0.1 wt% of Sr.

In the method for producing the die casting aluminum alloy, 10 wt% to 30 wt% of pure aluminum or commercially produced aluminum alloy may be added.

In the method of manufacturing the die casting aluminum alloy, the aluminum scrap may include A356.0 alloy or 356.0 alloy.

In the method of manufacturing the die casting aluminum alloy, the commercially produced aluminum alloy may include at least one of 1000 series, 3000 series, 4000 series, and 6000 series aluminum alloys.

According to an embodiment of the present invention made as described above, the manufacturing cost can be dramatically reduced and a method of manufacturing a die-casting aluminum alloy capable of resource recycling can be proposed. The die casting aluminum alloy manufactured using the above manufacturing method may have characteristics of tensile strength of 230 MPa or more, yield strength of 90 MPa or more, elongation of 3% or more, and thermal conductivity of 130 W/m·K or more. Of course, the scope of the present invention is not limited by this effect.

1 is a process flow chart schematically illustrating a method of manufacturing a die casting aluminum alloy according to an embodiment of the present invention.
Figure 2 shows the results of measuring the weight of samples according to an experimental example of the present invention before and after the corrosion resistance test.
Figure 3 is a photograph of the surface of a sample after a corrosion resistance test of the sample according to an experimental example of the present invention.

Hereinafter, various preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, and the following examples may be modified into various other forms, and the scope of the present invention is as follows. It is not limited to the examples. Rather, these embodiments are provided to make the present disclosure more faithful and complete and to fully convey the spirit of the present invention to those skilled in the art.

A representative commercial product commonly used as die casting aluminum alloy is ALDC12 aluminum alloy. The aluminum alloy has a thermal conductivity of 96.2 W/mK, and recently, as higher heat dissipation characteristics are required, new aluminum alloys are being developed.

However, although mechanical strength and heat dissipation characteristics can be improved compared to the ALDC12 aluminum alloy, there is a problem that it is difficult to use in the die casting method as fluidity is significantly poor. In addition, the use of large amounts of expensive pure metal when manufacturing alloys results in an increase in manufacturing costs.

To solve this problem, the present invention may include US standard A356.0 alloy or 356.0 alloy instead of using expensive pure metal. Alternatively, it may include Korean standard AC4CH alloy or AC4C alloy.

Aluminum alloy scrap was used. Hereinafter, a method for manufacturing a die casting aluminum alloy according to an embodiment of the present invention will be described in detail with reference to FIG. 1.

1 is a process flow chart schematically illustrating a method of manufacturing a die casting aluminum alloy according to an embodiment of the present invention.

Referring to Figure 1, the manufacturing method (S100) of a die casting aluminum alloy according to an embodiment of the present invention includes the step of dissolving US standard A356.0 alloy or 356.0 alloy scrap by heating at a temperature of 700°C to 800°C (S110). ) can be performed. Afterwards, a step (S120) of separating slag and degassing it using a dross remover may be performed.

Afterwards, a step (S130) of adding pure aluminum or commercially available aluminum alloy to the scrap may be performed. Thereafter, the step of separating slag and degassing using a dross remover (S140) can be performed in the same manner as step S120. Finally, die casting aluminum alloy can be manufactured by performing component analysis and manufacturing an aluminum alloy ingot (S150).

As an example, by using US standard A356.0 alloy or 356.0 alloy scrap as a raw material, the fluidity required for die casting can be secured. Here, in order to further improve the heat dissipation characteristics, the composition can be diluted by adding an appropriate amount of pure aluminum or commercially available aluminum alloy. At this time, the amount of pure aluminum or commercially produced aluminum alloy added for dilution may range from 10 wt% to 30 wt%. Here, the amount of pure aluminum or commercially produced aluminum alloy refers to a value considering the final content range of Si in order to satisfy the physical properties of the die casting aluminum alloy. In addition, the commercially produced aluminum alloy may include at least one of 1000 series, 3000 series, 4000 series, and 6000 series aluminum alloys. Preferably, the commercially produced aluminum alloy added in the present invention may be a 1000-series aluminum alloy or a 6000-series aluminum alloy.

Since the target Si content in the present invention is 5.0 wt% to 8.0 wt%, taking this into consideration, the amount of pure aluminum or commercially produced aluminum alloy added to aluminum scrap was limited to 10 wt% to 30 wt%.

Meanwhile, the composition of the aluminum alloy is 5.0 wt% to 8.0 wt% Si, 0.05 wt% to 0.5 wt% Fe, 0.01 wt% to 2.0 wt% Cu, 0.001 wt% to 0.1 wt% Mn, 0.05 wt% It contains from 1.5 wt% Mg, 0.001 wt% to 0.1 wt% Zn, and the balance may contain Al and other inevitable impurities. Here, the mechanical properties of the die casting aluminum alloy may vary depending on the content of Cu and Mg contained in the aluminum alloy.

As an example, the Cu content contained in the aluminum alloy may be 0.01 wt% to 0.5 wt%, and the Mg content may be 0.05 wt% to 1.0 wt%. Die casting aluminum alloy manufactured with the above composition can satisfy high thermal conductivity, high elongation, and high corrosion resistance characteristics.

As another example, the Cu content contained in the aluminum alloy may be 0.5 wt% to 2.0 wt%, and the Mg content may be 0.05 wt% to 1.0 wt%. Die casting aluminum alloy manufactured with the above composition can satisfy high strength characteristics.

As another example, the Cu content contained in the aluminum alloy may be 0.01 wt% to 0.5 wt%, and the Mg content may be 0.05 wt% to 1.5 wt%. Die casting aluminum alloy manufactured with the above composition can satisfy high strength and high corrosion resistance characteristics.

As another example, the content of Cu contained in the aluminum alloy may be 0.5 wt% to 1.0 wt%, and the content of Mg may be 0.05 wt% to 1.0 wt%. Die casting aluminum alloy manufactured with the above composition can satisfy high thermal conductivity and high strength characteristics.

Hereinafter, the values for the mechanical properties will be described in more detail through experimental examples.

The Si content can be configured to satisfy 5.0 wt% to 8.0 wt%. Si plays a role in improving strength without worsening corrosion resistance, while securing the minimum fluidity required to be used as a die casting material. Si is used to improve the fluidity of the melt, reduce shrinkage, and improve heat resistance, and can be added at 5.0 wt% or more. It combines with Mg and precipitates into Mg ₂ Si through aging, which determines the mechanical properties. The residual Si remaining after combining with Mg precipitates alone to improve mechanical properties and is an effective ingredient in improving the fluidity of molten metal.

If the amount of Si added is less than 5.0 wt%, the desired strength and fluidity cannot be obtained. On the other hand, if the amount of Si added exceeds 8.0 wt%, thermal conductivity deteriorates. In addition, it has brittle properties, making it impossible to satisfy the desired product specifications of the molded product.

The component content of Fe can be configured to satisfy 0.05wt% to 0.5wt%.

If more than 0.05% of Fe is added, the elongation rate decreases, but it is added up to 0.5% to prevent the mold and product from sticking. Even in very small amounts, it forms Al ₃ Fe compounds and combines with Si to form Al-Fe-Si intermetallic compounds, which reduces mechanical properties. Even a small amount deteriorates the surface gloss, and adding about 0.5% has the effect of preventing sticking to the mold during die casting.

If the amount of Fe added is less than 0.05wt%, the desired strength cannot be obtained. On the other hand, if the amount of Fe added exceeds 0.5wt%, an Al-Fe-Si intermetallic compound is formed and stress is concentrated at the tip. Since it acts as a starting point for cracks, it is a factor in lowering strength characteristics. Not only does it reduce ductility, but if it is added excessively, it can also cause corrosion of the material.

The component content of Cu can be configured to satisfy 0.01 wt% to 2.0 wt%. Cu forms a CuAl ₂ intermetallic compound, contributing to improving hardness and strength through precipitation hardening. In addition, Cu can improve the fluidity and machinability of molten metal and improve its strength.

If the amount of Cu added is less than 0.01 wt%, the desired strength and ductility cannot be obtained. On the other hand, if the amount of Cu added exceeds 2.0 wt%, corrosion resistance and ductility are reduced and may cause corrosion of the material.

The component content of Mn can be configured to satisfy 0.001 wt% to 0.1 wt%. Mn improves fluidity and machinability and increases strength and hardness. It is possible to improve strength without reducing Mn corrosion resistance, reduce or prevent Fe hazard rate, improve scorching, and have the effect of refining grains. In detail, the addition of Mn is intended to improve corrosion resistance and can increase softening resistance at a certain high temperature and improve surface treatment characteristics. Adding a small amount of Mn may contribute to improving strength through the solid solution strengthening effect and fine precipitate dispersion effect without significantly weakening corrosion resistance, but if the amount of Mn added is less than 0.001 wt%, the strength improvement effect cannot be obtained. On the other hand, if the amount of Mn added exceeds 0.1 wt%, the effect of improving corrosion resistance cannot be obtained. Additionally, if it exceeds 0.1wt%, thermal conductivity is significantly reduced and sludge is generated, which causes hard spots in castings.

The component content of Mg can be configured to satisfy 0.05 wt% to 1.5 wt%. Mg can improve corrosion resistance, strength, and elongation, and contribute to weight reduction and machinability. In addition, Mg can cause an oxide layer (MgO) to be quickly formed on the surface of the product, and this oxide layer (MgO) can improve corrosion resistance by acting like a coating film on the surface.

If the amount of Mg added is less than 0.05 wt%, the amount of Mg ₂ Si precipitated is insufficient and the required strength cannot be obtained. On the other hand, if the amount of Mg added exceeds 1.5 wt%, formability deteriorates and productivity decreases, and a large amount of oxides are formed in the molten metal, which adversely affects casting quality and reduces elongation. Additionally, excess Mg that fails to form Mg ₂ Si may inhibit the solid solution of Mg ₂ Si, thereby reducing strength.

The component content of Zn can be configured to satisfy 0.001 wt% to 0.1 wt%. Zn is an additive element to improve corrosion resistance and strength through age hardening. If the amount of Zn added is less than 0.001 wt%, the effect is minimal, and if the amount of Zn added exceeds 0.1 wt%, physical properties such as thermal conductivity, elongation, and corrosion resistance may be reduced.

In addition, the aluminum alloy includes 0.001 wt% to 0.15 wt% of Ti, 0.001 wt% to 0.1 wt% of Ca, 0.001 wt% to 0.1 wt% of Sn, 0.001 wt% to 0.1 wt% of Cr, and 0.001 wt% to 0.001 wt%. It may further include 0.1 wt% of Zr, 0.001 wt% to 0.1 wt% of Ni, and 0.001 wt% to 0.1 wt% of Sr.

Additionally, the aluminum alloy may further include 0.001 wt% to 0.1 wt% of P. P is an impurity that is easily incorporated during the refining and casting process of aluminum. If the P content exceeds 0.1 wt%, the mechanical properties deteriorate, so a lower content is more advantageous. However, controlling it to less than 0.001 wt% is very difficult in the manufacturing process, so if mixing in aluminum during the refining and casting process is unavoidable, it is preferable to control P to less than 0.1 wt%.

The component content of Ti can be configured to satisfy 0.001 wt% to 0.15 wt%. Ti is an ingredient that is effective in grain refinement, and can contribute to improving formability and strength through grain refinement. If the amount of Ti added is less than 0.001 wt%, the effect is minimal, and if the amount of Ti added exceeds 0.15 wt%, a large amount of large and rough intermetallic compounds such as TiAl ₃ are produced, which reduces the mechanical properties of the alloy. there is.

The component content of Ca can be configured to satisfy 0.001 wt% to 0.1 wt%.

The addition of Ca is an ingredient that has the effect of improving the needle-like structure of Si in Al-Si-based alloys, making it more diversified and spherical, and can contribute to improving mechanical properties. Through this improvement of the needle-like structure, the thermal conductivity of the alloy is improved. . If the amount of Ca added is less than 0.001 wt%, the effect is minimal, and if the amount of Ca added exceeds 0.1 wt%, CaAl ₄ intermetallic compounds with micropores and brittleness are generated, deteriorating the mechanical properties and thermal conductivity of the alloy. There is a problem with ordering.

The component content of Sn can be configured to satisfy 0.001 wt% to 0.1 wt%.

Sn improves the lubricity of mechanical parts that involve friction, such as bearings. If the amount of Ni added is less than 0.001 wt%, the effect is minimal, and if the amount of Sn added exceeds 0.1 wt%, it reduces thermal conductivity. There is a problem.

The component content of Cr can be configured to satisfy 0.001 wt% to 0.1 wt%.

Cr improves corrosion resistance and strength, but when the amount of Cr added is less than 0.001 wt%, the effect is minimal, and when the amount of Cr added exceeds 0.1 wt%, there is a problem of significantly lowering the thermal conductivity.

The component content of Zr can be configured to satisfy 0.001 wt% to 0.1 wt%.

A minimum amount of Zr is used to create the reinforcing phase of Al ₃ Zr. If the amount of Zn added is less than 0.001 wt%, the effect is minimal, and if the amount of Zn added exceeds 0.1 wt%, the effect of Al ₃ Zr is reduced. There is a problem in that the strengthening phase is excessively generated, thereby deteriorating the mechanical properties.

The component content of Ni can be configured to satisfy 0.001 wt% to 0.1 wt%.

Ni improves high-temperature strength and hardness, but when the amount of Ni added is less than 0.001 wt%, the effect is minimal, and when the amount of Ni added exceeds 0.1 wt%, there is a problem of lowering thermal conductivity.

The component content of Sr can be configured to satisfy 0.001 wt% to 0.1 wt%.

Sr plays a role in miniaturizing eutectic silicon. If it is less than 0.001 wt%, the above-mentioned characteristics cannot be obtained, and if it exceeds 0.1 wt%, it can promote the incorporation of gas and the creation of compounds. .

The Al content may be 90 wt% or more, and other unavoidable impurities may be added.

According to various embodiments of the present invention, it is possible to manufacture an aluminum alloy for die casting that has stable high thermal conductivity characteristics, high strength characteristics, and excellent fluidity by appropriately controlling the amount of impurities in aluminum that can reduce the thermal conductivity of the alloy. You can. The aluminum alloy for die casting manufactured in this way can have characteristics of tensile strength of 230 MPa or more, yield strength of 90 MPa or more, elongation of 3% or more, and thermal conductivity of 130 W/m·K or more.

Below, embodiments are described to aid understanding of the present invention. However, the following experimental examples are only intended to aid understanding of the present invention, and the present invention is not limited to the following examples.

Table 1 below shows a composition table of aluminum alloys appropriately formulated according to various embodiments of the present invention. Experimental samples were prepared according to the manufacturing method of the die casting aluminum alloy of the present invention by adding a predetermined amount of pure aluminum to aluminum scrap having the US standard A356.0 alloy or 356.0 alloy component to have the composition shown in Table 1 below. . For comparison, a comparative sample having the same composition as a conventional commercial alloy was also prepared.

Sample Si Fe Cu Mn Mg Zn Ti Ca Sn Cr Zr Ni Sr. Comparative Example 1 10 1.3 2.5 0.5 0.3 1.5 - - 0.15 - - 0.3 - Comparative Example 2 9.5 2 3 0.5 0.1 3 - - 0.35 - - 0.5 - Comparative Example 3 12 2 One 0.35 0.1 0.5 - - - - - - - Comparative Example 4 10 1.0 0.05 0.6 0.4 0.2 - - - - - - - Comparative Example 5 9.21 0.128 2.21 0.687 0.501 <0.001 0.142 0.0081 0.007 0.012 0.0043 0.02 0.0169 Comparative Example 6 9.52 1.400 0.0011 0.694 0.481 <0.001 0.142 0.0072 0.006 0.011 0.0044 0.04 <0.0001 Comparative Example 7 9.01 0.130 0.0008 0.645 0.309 <0.001 0.140 0.0045 0.005 0.021 0.0043 0.05 0.0170 Comparative Example 8 9.9800 0.5210 0.0051 0.005 0.2760 <0.001 <0.001 0.0026 <0.001 <0.0005 0.0008 0.0018 <0.0001 Example 1 7.2900 0.4160 0.0046 0.0040 0.2040 <0.001 <0.001 0.0014 <0.001 <0.00068 0.001 0.0022 <0.0001 Example 2 6.9200 0.3950 0.0054 0.0029 0.1810 <0.001 0.004 0.0024 <0.001 0.0019 <0.0003 0.0026 <0.0001 Example 3 7.1300 0.1420 0.0320 0.0061 0.3450 0.0012 0.1200 0.0019 <0.001 0.0111 0.00046 0.0025 0.0024 Example 4 7.0700 0.1250 2.0200 0.0078 0.3100 <0.001 0.1190 0.00072 0.0013 0.0097 0.00049 0.0012 0.0023 Example 5 6.4400 0.1210 1.8900 0.0075 0.2880 <0.001 0.1070 0.0019 <0.001 0.0089 0.00043 0.0011 0.0019 Example 6 5.6300 0.1280 1.9100 0.0071 0.2760 <0.001 0.1000 0.0010 <0.001 0.0088 0.00055 0.0018 0.0017 Example 7 6.4200 0.3850 0.0069 0.0036 0.6340 <0.001 0.0035 0.0098 <0.001 0.0021 <0.0003 0.0031 <0.0001 Example 8 5.7400 0.3350 0.0046 0.0031 0.9510 <0.001 0.0024 0.0141 <0.001 0.0019 <0.0003 0.0019 <0.0001 Example 9 7.07 0.1240 0.0262 0.0079 0.625 <0.001 0.103 0.0035 0.0021 0.0104 0.00072 0.0012 0.0030 Example 10 6.78 0.133 0.0291 0.0083 0.952 <0.001 0.110 0.0092 0.0018 0.0105 0.00061 0.0012 0.0030 Example 11 7.08 0.142 0.0272 0.0083 1.15 <0.001 0.104 0.0127 0.0036 0.0107 0.00078 0.0012 0.0030 Example 12 5.6200 0.3400 0.5640 0.0034 0.9570 <0.001 0.0023 0.0129 <0.001 0.0026 <0.0003 0.0027 <0.0001

The alloy manufactured using the above composition can be re-melted at a temperature of 650°C to 730°C, go through a degassing process such as GBF (Gas Bubbling Filteration), and produce a product through a die casting process. In the present invention, the die casting can be performed after preheating the temperature of the mold provided in the die casting device to a temperature of 150°C to 250°C, and can be performed at a speed of 0.2 to 3.5 m/s and a casting pressure of 70 to 100 MPa.

Using the specimens prepared in the above examples and comparative examples, the strength and elongation at room temperature were measured and compared as follows.

Tensile strength (MPa) was measured using the test method specified in KS B0802 (ASTM E8M). Yield strength (MPa) was measured using the test method specified in KS B0802 (ASTM E8M). Elongation (%) was measured using the test method specified in KS B0802 (ASTM E8M). The tensile strength, yield strength, and elongation measurement results are shown in Table 2 below.

In addition, using the samples prepared in the above examples and comparative examples (samples of thermal conductivity samples collected from die casting prototypes), the thermal conductivity (W/mk) was measured at room temperature in a room temperature laboratory environment in accordance with ASTM E1461-13. ) and the compared results are shown in Table 2 below.

Sample YS UTS E.I. thermal conductivity Comparative Example 1 152 310 3.5 96.2 Comparative Example 2 159 317 2.5 109 Comparative Example 3 145 296 2.5 121 Comparative Example 4 172 295 5 113 Comparative Example 5 177 293 3.9 122 Comparative Example 6 171 272 3.1 122 Comparative Example 7 161 289 4.8 123 Comparative Example 8 115.82 260.58 5.71 141.406 Example 1 94.91 240.39 10.80 155.150 Example 2 92.12 232.89 10.70 154.355 Example 3 114.64 259.93 11.02 144.276 Example 4 138.50 276.78 4.66 130.439 Example 5 128.85 275.52 6.13 131.737 Example 6 119.33 274.97 8.82 147.375 Example 7 110.79 238.43 6.10 152.731 Example 8 129.49 248.93 6.13 153.959 Example 9 136.98 258.37 5.7 146.338 Example 10 151.61 254.49 3.52 140.620 Example 11 166.25 264.82 3.11 135.859 Example 12 136.26 259.22 5.44 151.848

Referring to Tables 1 and 2, by adding a predetermined amount of pure aluminum to A356.0 aluminum alloy or 356.0 aluminum alloy scrap instead of expensive pure aluminum, the strength characteristics of the example sample are relatively high compared to the comparative example sample. Although low, it was confirmed that the elongation was more than 3%, showing higher characteristics than the comparative sample. In addition, it was confirmed that the thermal conductivity was over 130 W/m·K, showing high thermal conductivity characteristics.

In addition, in order to confirm the corrosion resistance of the die casting aluminum alloy according to an embodiment of the present invention, the weight of the sample of Comparative Example 1 and the samples of Examples 9 to 11 before and after the corrosion resistance test were measured and separately summarized in Table 3 below. .

In addition, as shown in Table 3, Figures 2 and 3, the corrosion resistance was determined by manufacturing the specimens of this example and the comparative example to a predetermined size and spraying 5% NaCl salt water on the surface of the specimen at 25°C for 48 hours. As a result of measuring corrosion resistance by the rate of increase in weight, it was found that the weight increase of the specimens of the examples was significantly lower than that of the specimens of the comparative examples, thereby improving corrosion resistance.

Sample Weight before experiment (g) Weight after experiment (g) Weight increase rate (%) Comparative Example 1 9.8655 9.9095 0.445998682 Example 9 9.5995 9.6094 0.103130371 Example 10 9.6170 9.6245 0.077986898 Example 11 9.5408 9.5458 0.052406507

Figure 2 is a result of measuring the weight of the samples before and after the corrosion resistance test according to an experimental example of the present invention, and Figure 3 is a surface photograph of the sample after the corrosion resistance test of the samples according to an experimental example of the present invention.

Referring to Figures 2, 3, and Table 3, the corrosion resistance of the samples (Examples 9 to 11) to which a relatively higher Mg content was added compared to other samples to have the high corrosion resistance characteristics of die casting aluminum alloy was compared to Comparative Example 1. It was confirmed that there was further improvement compared to the sample.

As described above, the alloy manufactured using the die casting aluminum alloy manufacturing method according to an embodiment of the present invention has a tensile strength of 230 MPa or more, a yield strength of 90 MPa or more, an elongation of 3% or more, and a thermal conductivity of 130 W/m·K or more. I was able to confirm that I was satisfied. In addition, according to the present invention, by manufacturing a highly heat-dissipating aluminum alloy using scrap, there is an effect of improving resource recycling and dramatically reducing manufacturing costs.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the attached patent claims.

Claims (8)

A method for manufacturing die casting aluminum alloy,
The aluminum alloy is formed by adding pure aluminum or commercially available aluminum alloy to aluminum scrap,
The composition of the aluminum alloy is,
5.0 wt% to 8.0 wt% Si, 0.05 wt% to 0.5 wt% Fe, 0.01 wt% to 0.5 wt% Cu, 0.001 wt% to 0.1 wt% Mn, 0.05 wt% to 1.0 wt% Mg, Containing 0.001 wt% to 0.1 wt% of Zn, the balance containing Al and other inevitable impurities,
Manufacturing method of die casting aluminum alloy. A method for manufacturing die casting aluminum alloy,
The aluminum alloy is formed by adding pure aluminum or commercially available aluminum alloy to aluminum scrap,
The composition of the aluminum alloy is,
5.0 wt% to 8.0 wt% Si, 0.05 wt% to 0.5 wt% Fe, 0.5 wt% to 2.0 wt% Cu, 0.001 wt% to 0.1 wt% Mn, 0.05 wt% to 1.0 wt% Mg, Containing 0.001 wt% to 0.1 wt% of Zn, the balance containing Al and other inevitable impurities,
Manufacturing method of die casting aluminum alloy. A method for manufacturing die casting aluminum alloy,
The aluminum alloy is formed by adding pure aluminum or commercially available aluminum alloy to aluminum scrap,
The composition of the aluminum alloy is,
5.0 wt% to 8.0 wt% Si, 0.05 wt% to 0.5 wt% Fe, 0.01 wt% to 0.5 wt% Cu, 0.001 wt% to 0.1 wt% Mn, 0.05 wt% to 1.5 wt% Mg, Containing 0.001 wt% to 0.1 wt% of Zn, the balance containing Al and other inevitable impurities,
Manufacturing method of die casting aluminum alloy. A method for manufacturing die casting aluminum alloy,
The aluminum alloy is formed by adding pure aluminum or commercially available aluminum alloy to aluminum scrap,
The composition of the aluminum alloy is,
5.0 wt% to 8.0 wt% Si, 0.05 wt% to 0.5 wt% Fe, 0.5 wt% to 1.0 wt% Cu, 0.001 wt% to 0.1 wt% Mn, 0.05 wt% to 1.0 wt% Mg, Containing 0.001 wt% to 0.1 wt% of Zn, the balance containing Al and other inevitable impurities,
Manufacturing method of die casting aluminum alloy. According to any one of claims 1 to 4,
The aluminum alloy includes 0.001wt% to 0.15wt% Ti, 0.001wt% to 0.1wt% Ca, 0.001wt% to 0.1wt% Sn, 0.001wt% to 0.1wt% Cr, 0.001wt% to 0.1wt% % Zr, 0.001 wt% to 0.1 wt% Ni and 0.001 wt% to 0.1 wt% Sr,
Manufacturing method of die casting aluminum alloy. According to any one of claims 1 to 4,
10 wt% to 30 wt% of the pure aluminum or commercially available aluminum alloy is added,
Manufacturing method of die casting aluminum alloy. According to any one of claims 1 to 4,
The aluminum scrap includes A356.0 alloy or 356.0 alloy,
Manufacturing method of die casting aluminum alloy. According to any one of claims 1 to 4,
The commercially produced aluminum alloy includes at least one of 1000 series, 3000 series, 4000 series, and 6000 series aluminum alloys,
Manufacturing method of die casting aluminum alloy.