High thermal conductive casting Aluminum alloy and the manufacturing method thereof

Abstract

The present invention is an Al-Ni-Fe alloy, comprising 1.0 to 1.3 wt% nickel (Ni), 0.3 to 0.9 wt% iron (Fe), and the remainder being aluminum (Al), based on 100 wt% of the total alloy, a high thermal conductivity aluminum alloy for casting.

Description

Technology Field

[0001] The present invention relates to a high thermal conductivity aluminum alloy for casting, and more specifically, to a aluminum alloy for casting having a thermal conductivity of 200 W / mK or higher. Background Technology

[0003] High thermal conductivity aluminum alloys are used in automotive parts that need to rapidly transfer heat by coming into contact with a heat source, such as heat sinks.

[0004] Although pure aluminum (Al) has the highest thermal conductivity, it is not widely used due to poor mechanical properties and productivity.

[0005] Instead, alloys with minimized additive elements to ensure basic castability and minimum physical properties are used as high thermal conductivity alloys, which can be classified into extruded and cast materials.

[0006] Extruded materials have excellent thermal conductivity, but they are expensive and have poor castability, which leads to high manufacturing costs when producing parts. In the case of cast materials, the thermal conductivity is approximately 160 W / mK, which is inferior to the thermal conductivity or hot crack resistance. For cast materials with a thermal conductivity of approximately 160 W / mK, the heat dissipation performance is more than 20% lower compared to extruded materials.

[0007] As such, there is a need for the development of aluminum alloy castings with improved thermal conductivity and hot crack characteristics. The problem to be solved

[0009] The invention relates to a high thermal conductivity aluminum alloy for casting, and aims to provide an alloy having a thermal conductivity of 200 W / mK or higher and excellent hot crack characteristics. means of solving the problem

[0011] A high thermal conductivity aluminum alloy for casting according to one embodiment of the present invention may be an Al-Ni-Fe alloy comprising, based on 100 wt% of the total alloy, 1.0 to 1.3 wt% nickel (Ni), 0.3 to 0.9 wt% iron (Fe), and the remainder being aluminum (Al).

[0012] The sum of the nickel and iron content (Ni+Fe) may be 1.6 wt% or more.

[0013] The eutectic FeNiAl9 phase in the above alloy may be 5 wt% or more.

[0014] The sum of the nickel and iron content (Ni+Fe) may be 1.9 wt% or less.

[0015] The above iron content may be less than or equal to the nickel content.

[0016] The fraction of the Al matrix phase in the above alloy may be 94 wt% or more.

[0017] The thermal conductivity of the above alloy may be 200 W / mK or higher.

[0018] The above alloy may further contain 0.1 to 0.4 wt% of manganese (Mn).

[0019] The thermal conductivity of the above alloy may be 205 W / mK or higher.

[0020] The above alloy may contain additional alloying elements.

[0021] The content of the other alloying elements may be 0.5 wt% or less based on the total amount of the alloy. The other alloying elements may include one or more selected from the group comprising copper (Cu), magnesium (Mg), and silicon (Si).

[0022] The copper (Cu) content may be 0.2 wt% or less based on the total amount of the alloy.

[0023] The above magnesium (Mg) content may be 0.3 wt% or less based on the total amount of the alloy.

[0024] The above silicon (Si) content may be 0.3 wt% or less based on the total amount of the alloy.

[0026] A method for manufacturing a high thermal conductivity aluminum alloy for casting according to one embodiment of the present invention may include the step of melting aluminum and the step of adding iron (Fe) and nickel (Ni) to the melted aluminum.

[0027] The step of adding the iron (Fe) and nickel (Ni) may be to add them such that, based on 100 wt% of the total alloy, 1.0 to 1.3 wt% of nickel (Ni), 0.3 to 0.9 wt% of iron (Fe), and the remainder being aluminum (Al).

[0028] The step of adding the above iron (Fe) and nickel (Ni) may be to add the nickel and iron content (Ni+Fe) in an amount of 1.6 to 1.9 wt%.

[0029] The above-mentioned manufactured alloy may have a fraction of FeNiAl9 in the eutectic phase of 5 wt% or more.

[0030] The above-mentioned manufactured alloy may have a fraction of the Al matrix phase of 94 wt% or more.

[0031] The step of adding iron (Fe) and nickel (Ni) above may be such that the copper (Cu) content is 0.2 wt% or less based on 100 wt% of the total alloy.

[0032] The step of adding iron (Fe) and nickel (Ni) above may be such that the magnesium (Mg) content is 0.3 wt% or less based on 100 wt% of the total alloy.

[0033] The step of adding iron (Fe) and nickel (Ni) above may be such that the silicon (Si) content is 0.3 wt% or less based on 100 wt% of the total alloy. Effects of the invention

[0035] The present invention relates to a high thermal conductivity aluminum alloy for casting, having a thermal conductivity of 200 W / mK or higher and improved hot crack characteristics.

[0036] In addition, the alloy of the present invention is a non-heat-treatable alloy capable of achieving maximum thermal conductivity without special heat treatment, thereby reducing additional process costs.

[0037] In other words, the aluminum alloy of the present invention can achieve a reduction in manufacturing costs, as well as a 120% improvement in thermal conductivity compared to conventional cast aluminum alloys and an increase in cooling efficiency accordingly. Brief explanation of the drawing

[0039] Figure 1 is a photograph showing the microstructure of an Al-Ni-Fe alloy according to one embodiment of the present invention. Figure 2 is a graph showing the eutectic FeNiAl9 phase fraction according to the iron (Fe) content when the nickel (Ni) content is 1.0 wt%. Figure 3 is a graph showing the eutectic FeNiAl9 phase fraction according to the iron (Fe) content when the nickel (Ni) content is 1.1 wt%. Figure 4 is a graph showing the eutectic FeNiAl9 phase fraction according to the iron (Fe) content when the nickel (Ni) content is 1.2 wt%. Figure 5 is a graph showing the eutectic FeNiAl9 phase fraction according to the iron (Fe) content when the nickel (Ni) content is 1.3 wt%. Figure 6 shows an actual photograph of a casting when the FeNiAl9 phase fraction of Comparative Example 2 is less than 5 wt%. Figure 7 shows an actual photograph of a casting when the FeNiAl9 phase fraction of Comparative Example 2 is less than 5 wt%. Figure 8 shows an actual photograph of a casting when the FeNiAl9 phase fraction of Example 2 is 5 wt% or more. Figure 9 shows an actual photograph of a casting when the FeNiAl9 phase fraction of Example 2 is 5 wt% or more. Figure 10 is a graph showing the aluminum (Al) matrix phase fraction according to copper (Cu) content. Figure 11 is a graph showing the aluminum (Al) matrix phase fraction according to magnesium (Mg) content. Figure 12 is a graph showing the aluminum (Al) matrix phase fraction according to silicon (Si) content. Specific details for implementing the invention

[0040] Hereinafter, embodiments of the present invention will be described in detail. However, these are presented as examples and are not intended to limit the present invention, and the present invention is defined only by the scope of the claims set forth below.

[0042] In this specification, when a part is described as “comprising” a certain component, it means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0043] In this specification, singular forms used include plural forms unless phrases clearly indicate otherwise. The meaning of "comprising" as used in this specification specifies a particular characteristic, area, integer, step, action, element and / or component, and does not exclude the presence or addition of other characteristics, areas, integers, steps, actions, elements and / or components. Additionally, singular forms include plural forms unless specifically stated otherwise in the phrases.

[0044] All terms used herein, including technical and scientific terms, have the same meaning as generally understood by those skilled in the art to which this invention pertains. Terms defined in commonly used dictionaries are further interpreted to have meanings consistent with relevant technical literature and the present disclosure, and are not interpreted in an ideal or highly formal sense unless otherwise defined.

[0045] Accordingly, in some embodiments, well-known techniques are not specifically described to avoid the invention being interpreted ambiguously.

[0046] In addition, the method for manufacturing a high thermal conductivity aluminum alloy for casting according to an embodiment of the present invention may include additional processes in addition to the processes presented, as needed.

[0047] In one embodiment of the present invention, the meaning of including other alloying elements further is that the remainder of aluminum (Al) is replaced by the additional amount of the other elements.

[0050] High thermal conductivity aluminum alloy for casting

[0051] The present invention is an Al-Ni-Fe alloy.

[0052] The Al-Ni-Fe alloy of the present invention may comprise 1.0 to 1.3 wt% nickel (Ni), 0.3 to 0.9 wt% iron (Fe), and the remainder being aluminum (Al), based on 100 wt% of the total alloy.

[0053] The alloy satisfying the above conditions may be an aluminum alloy having high thermal conductivity and excellent castability.

[0054] The addition of nickel (Ni) and iron (Fe) can secure superior castability compared to pure aluminum while maintaining high thermal conductivity.

[0055] Figure 1 is a photograph showing the microstructure of an Al-Ni-Fe-Mn alloy according to one embodiment of the present invention. The microstructure is composed of an aluminum dendrite as a superterminal phase and an Al-FeNiAl9 phase as a eutectic phase. The FeNiAl9 phase as a eutectic phase appears as a dark area in Figure 1 and has a fine fibrous structure.

[0057] The sum of the nickel and iron content (Ni+Fe) may be 1.6 wt% or more.

[0058] Specifically, it may be 1.7 wt%, 1.8 wt%, or 1.9 wt% or more.

[0059] The sum of the nickel and iron content (Ni+Fe) above may be 1.9 wt% or less.

[0060] Specifically, it may be 1.8 wt%, 1.7 wt%, or 1.6 wt% or less.

[0061] The eutectic FeNiAl9 phase in the above alloy may be 5 wt% or more.

[0062] Aluminum, nickel, and iron form a eutectic FeNiAl9 phase within the alloy. When the combined range of nickel and iron content is satisfied, at least 5 wt% of the eutectic FeNiAl9 phase can be formed.

[0063] Sufficient castability can be ensured if the eutectic FeNiAl9 phase is present in the alloy at a rate of at least 5 wt%.

[0065] The fraction of the Al matrix phase in the above alloy may be 94 wt% or more.

[0066] The fraction of the Al matrix phase in the above alloy may be 95 wt% or less.

[0067] The matrix phase refers to the basic matrix phase that constitutes the microstructure.

[0068] As the eutectic FeNiAl9 phase within the alloy increases, the thermal conductivity of the entire alloy decreases. Therefore, to secure high thermal conductivity of 200 W / mK or higher, the fraction of the Al matrix phase must be maintained at 94% or higher, and for this, the sum of the nickel and iron content (Ni+Fe) must be 1.9 or less.

[0070] The iron content in the above alloy may be less than or equal to the nickel content. If the iron content exceeds the nickel content, additional Al3Fe phases may be formed, which may degrade thermal conductivity properties.

[0072] The thermal conductivity of the alloy according to one embodiment of the present invention may be 200 W / mK or higher. Specifically, it may be 201 W / mK, 204 W / mK, 205 W / mK, 207 W / mK, 209 W / mK, 210 W / mK, 211 W / mK, 215 W / mK, or 217 W / mK or higher.

[0073] As such, the present invention has excellent thermal conductivity, and can improve the cooling efficiency of parts and devices to which it is applied.

[0074] The thermal conductivity of the alloy according to one embodiment of the present invention may be 230 W / mK or less. Specifically, it may be 225 W / mK, 220 W / mK, 217 W / mK, or 210 W / mK or less.

[0076] An alloy according to another embodiment of the present invention may contain 0.1 to 0.4 wt% of manganese (Mn).

[0077] Manganese (Mn) combines with Fe and other elements (particularly Cu, Si, etc.) to inhibit the solid solution of these elements, thereby providing an additional effect of improving thermal conductivity. Furthermore, machinability can be enhanced through increased hardness.

[0079] An alloy according to another embodiment of the present invention may further include other alloying elements.

[0080] The aforementioned other alloying elements refer to alloying elements other than aluminum (Al), nickel (Ni), and iron (Fe).

[0081] Specifically, the other alloying elements may include one or more selected from the group comprising copper (Cu), magnesium (Mg), and silicon (Si).

[0082] The content of the above other alloying elements may be 0.5 wt% or less based on the total amount of the alloy.

[0083] If the above range is satisfied, the decrease in thermal conductivity due to the inclusion of other alloying elements can be avoided.

[0084] The copper (Cu) content in the alloy may be less than 0.3 wt%. Specifically, the upper limit of the copper content may be 0.25 wt% or less, 0.2 wt% or less, 0.15 wt% or less, 0.1 wt% or less, or 0.05 wt% or less, and the lower limit of the copper content may be 0 wt% or more, greater than 0 wt%, 0.05 wt% or more, 0.1 wt% or more, 0.15 wt% or more, or 0.2 wt% or more.

[0085] The copper (Cu) content in the above alloy may be 0.2 wt% or less. Specifically, it may be 0 to 0.2 wt%.

[0086] The magnesium (Mg) content in the alloy may be 0.45 wt% or less. Specifically, the upper limit of the magnesium content may be 0.4 wt% or less, 0.35 wt% or less, 0.3 wt% or less, 0.25 wt% or less, 0.2 wt% or less, 0.15 wt% or less, 0.1 wt% or less, 0.05 wt% or less, and the lower limit of the magnesium content may be 0 wt% or more, greater than 0 wt%, 0.05 wt% or more, 0.1 wt% or more, 0.15 wt% or more, 0.2 wt% or more, 0.25 wt% or more, or 0.3 wt% or more.

[0087] The magnesium (Mg) content in the alloy may be 0.3 wt% or less. Specifically, it may be 0 to 0.3 wt%.

[0088] The silicon (Si) content in the alloy may be 0.33 wt% or less. Specifically, the upper limit of the silicon (Si) content may be 0.3 wt% or less, 0.25 wt% or less, 0.2 wt% or less, 0.15 wt% or less, 0.1 wt% or less, or 0.05 wt% or less, and the lower limit of the silicon (Si) content may be 0 wt% or more, greater than 0 wt%, 0.05 wt% or more, 0.1 wt% or more, 0.15 wt% or more, 0.2 wt% or more, or 0.25 wt% or more.

[0089] The silicon (Si) content in the alloy may be 0.3 wt% or less. Specifically, it may be 0 to 0.3 wt%.

[0090] If the above content range is exceeded, the thermal conductivity of the alloy may decrease.

[0092] The following describes a method for manufacturing a high thermal conductivity aluminum alloy for casting. Explanations regarding parts that overlap with the previously described high thermal conductivity aluminum alloy for casting are omitted.

[0095] Method for manufacturing high thermal conductivity aluminum alloy for casting

[0096] A method for manufacturing a high thermal conductivity aluminum alloy for casting according to one embodiment of the present invention may include the step of melting aluminum and the step of adding iron (Fe) and nickel (Ni) to the melted aluminum.

[0097] When iron (Fe) and nickel (Ni) are added after first melting aluminum, iron (Fe) and nickel (Ni), which have very low solubility in aluminum, can be stably alloyed to prevent segregation and increase the melting speed, thereby shortening the manufacturing time.

[0098] Specifically, it may be manufactured by melting pure aluminum and then adding small amounts of iron (Fe) and nickel (Ni).

[0099] However, this discloses a preferred embodiment of the present invention and does not exclude the method of adding iron (Fe) and nickel (Ni) to aluminum and then melting it to produce an alloy.

[0101] The step of adding the iron (Fe) and nickel (Ni) may be to add them such that, based on 100 wt% of the total alloy, 1.0 to 1.3 wt% of nickel (Ni), 0.3 to 0.9 wt% of iron (Fe), and the remainder being aluminum (Al).

[0103] Preferred embodiments and comparative examples of the present invention are described below. However, the following examples are merely preferred embodiments of the present invention, and the present invention is not limited to the following examples.

[0105] Experimental Example 1 : Evaluation of nickel (Ni) and iron (Fe) content satisfying castability and high thermal conductivity

[0106] Figures 2, 3, 4, and 5 are graphs showing the iron (Fe) content range according to nickel (Ni) content to simultaneously satisfy castability and high thermal conductivity. To obtain excellent castability, at least 5 wt% of eutectic FeNiAl9 phase must be secured.

[0107] However, at the same time, in order to obtain high thermal conductivity characteristics, the Al matrix phase fraction must also be at least 94 wt%, and based on this, the iron (Fe) content according to nickel (Ni) content is as shown in Table 1.

[0108] division Content ratio (wt%) Ni+Fe content (wt%) FeNiAl9 phase (wt%) Al base (wt%) Al Ni Fe content range Example 1-1 Remaining 1 0.6~0.9 1.6~1.9 5~6 94~95 Examples 1-2 Remaining 1.1 0.5~0.8 1.6~1.9 Examples 1-3 Remaining 1.2 0.4~0.7 1.6~1.9 Examples 1-4 Remaining 1.3 0.3~0.6 1.6~1.9

[0109] Experimental Example 2 : Evaluation of castability based on eutectic FeNiAl9 phase fraction

[0110] Table 2 summarizes the castability results according to the eutectic FeNiAl9 phase fraction.

[0111] FeNiAl9 phase fraction Chemical composition (wt%) Castability evaluation results division Al Ni Fe Ni+Fe Less than 5wt% (Comparative Example 2) Comparative Example 2-1 Remaining 1 　0.3 　1.3 1.3~1.5 Numerous unfilled areas or hot cracks formed on the product due to insufficient fluidity Comparative Example 2-2 Remaining 1.1 　0.3 　1.4 Comparative Example 2-3 Remaining 1.2 　0.2 1.4 Comparative Example 2-4 Remaining 1.3 　0.2 　1.5 5 wt% or more (Example 2) Example 2-1 Remaining 1 0.6 1.6 1.6~1.9 No filling or cracking issues Example 2-2 Remaining 1.1 0.6 1.7 Examples 2-3 Remaining 1.2 0.6 1.8 Examples 2-4 Remaining 1.3 0.6 1.9

[0112] When the sum of the nickel and iron content (Ni+Fe) is less than 1.6 wt%, the eutectic FeNiAl9 phase fraction is less than 5 wt%.

[0113] Figures 6 and 7 are photographs of samples of Comparative Example 2-1 and Comparative Example 2-4, respectively. In the case of Figures 6 and 7, it can be seen that incomplete filling or hot cracking occurs in the product due to the lack of fluidity of the alloy.

[0114] When the sum of the nickel and iron content (Ni+Fe) is 1.6 wt% or more, 5 wt% or more of the eutectic FeNiAl9 phase is produced.

[0115] Figures 8 and 9 are photographs of samples of Example 2-1 and Example 2-4, respectively. In the case of Figures 8 and 9, it was confirmed that the product can be manufactured without castability problems such as product incomplete filling or hot cracking.

[0117] Experimental Example 3 Evaluation of thermal conductivity according to aluminum matrix phase fraction

[0118] Table 3 summarizes the change in thermal conductivity according to the phase fraction of the aluminum matrix.

[0119] division Content ratio (wt%) Al base phase fraction (wt%) Thermal conductivity Al Ni Ni+Fe (W / mK) Example 3-1 Remaining 1 1.7 94.71 215 Example 3-2 Remaining 1 1.8 94.39 210 Example 3-3 Remaining 1 1.9 94.07 204 Comparative Example 3-1 Remaining 1 2 93.76 197 Examples 3-4 Remaining 1.3 1.7 94.74 217 Examples 3-5 Remaining 1.3 1.8 94.42 211 Examples 3-6 Remaining 1.3 1.9 94.11 205 Comparative Example 3-2 Remaining 1.3 2 93.79 198

[0120] As the sum of the nickel and iron content (Ni+Fe) increases, the Al matrix phase fraction decreases, leading to a decrease in thermal conductivity.

[0121] Therefore, in order to obtain high thermal conductivity characteristics of 200 W / mK or higher, which is the level of wrought material, an Al matrix phase fraction of at least 94 wt% must be secured, and to achieve this, the sum of the nickel and iron content (Ni+Fe) must be managed to be 1.9 wt% or less.

[0123] Experimental Example 4: Evaluation of changes in thermal conductivity due to manganese addition

[0124] Table 4 shows the change in thermal conductivity according to the addition of manganese.

[0125] division Content ratio (wt%) Thermal conductivity Al Ni Ni+Fe Mn (W / mK) Comparative Example 4-1 Remaining 1 1.9 0 204 Comparative Example 4-2 Remaining 1 1.9 0.05 204 Example 4-1 Remaining 1 1.9 0.1 209 Example 4-2 Remaining 1 1.9 0.2 210 Example 4-3 Remaining 1 1.9 0.3 209 Examples 4-4 Remaining 1 1.9 0.4 207 Comparative Example 4-3 Remaining 1 1.9 0.5 201

[0126] In the case of manganese, it can combine with Cu, Si, and other elements inevitably added to aluminum alloys in addition to Fe to further enhance thermal conductivity.

[0127] As can be seen in Table 4, if manganese (Mn) is added at a rate of 0.1 wt% or more, an improvement in thermal conductivity is observed.

[0128] However, if manganese (Mn) is included in excess of 0.4 wt%, it actually causes a problem of reduced thermal conductivity.

[0129] In addition, manganese (Mn) has the effect of improving the surface hardness of the alloy, which improves the machinability of the alloy.

[0131] Experimental Example 5 : Evaluation of the effect of other alloying elements on the Al matrix fraction

[0132] Figures 10, 11, and 12 show the Al matrix phase fraction according to the content of other alloying elements, copper (Cu), magnesium (Mg), and silicon (Si), respectively.

[0133] Strengthening elements used in common aluminum alloys, such as copper (Cu), magnesium (Mg), and silicon (Si), reduce the thermal conductivity by lowering the aluminum matrix phase fraction in Al-Ni-Fe alloys, as shown in FIGS. 10, 11, and 12.

[0134] Therefore, copper (Cu), magnesium (Mg), and silicon (Si) are each required to satisfy the following content.

[0135] ① Copper (Cu): 0.2 wt% or less

[0136] ② Magnesium (Mg): 0.4 wt% or less

[0137] ③ Silicon (Si): 0.3 wt% or less

[0138] ④ Regulation of total impurity content: 0.5 wt% or less.

[0140] As such, it can be seen that the Al-Ni-Fe alloy of the present invention enables a reduction in manufacturing costs compared to wrought materials, as well as a 120% improvement in thermal conductivity compared to conventional cast aluminum alloys and an increase in cooling efficiency accordingly.

[0142] The present invention is not limited to the above embodiments and can be manufactured in various different forms, and those skilled in the art will understand that the invention can be implemented in other specific forms without changing the technical concept or essential features of the invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive.

Claims

Claim 1 A high thermal conductivity aluminum alloy for casting, comprising, based on 100 wt% of the total alloy, 1.0 to 1.3 wt% nickel (Ni), 0.3 to 0.9 wt% iron (Fe), 0.1 to 0.4 wt% manganese (Mn), and the remainder being aluminum (Al), wherein the sum of the nickel and iron content (Ni+Fe) is 1.6 wt% or more and 1.9 wt% or less. Claim 2 delete Claim 3 A high thermal conductivity aluminum alloy for casting according to claim 1, wherein the eutectic FeNiAl9 phase in the alloy is 5 wt% or more. Claim 4 delete Claim 5 A high thermal conductivity aluminum alloy for casting according to claim 1, wherein the iron content is less than or equal to the nickel content. Claim 6 A high thermal conductivity aluminum alloy for casting according to claim 1, wherein the fraction of the Al matrix phase in the alloy is 94 wt% or more. Claim 7 A high thermal conductivity aluminum alloy for casting, wherein, in any one of claims 1 to 6, the thermal conductivity of the alloy is 200 W / mK or higher. Claim 8 delete Claim 9 A high thermal conductivity aluminum alloy for casting according to claim 1, wherein the thermal conductivity of the alloy is 205 W / mK or higher. Claim 10 A high thermal conductivity aluminum alloy for casting according to claim 1, further comprising other alloying elements, wherein the content of said other alloying elements is 0.5 wt% or less based on the total amount of the alloy. Claim 11 In claim 6, a high thermal conductivity aluminum alloy for casting having a copper (Cu) content of 0.2 wt% or less. Claim 12 In claim 6, a high thermal conductivity aluminum alloy for casting having a magnesium (Mg) content of 0.3 wt% or less. Claim 13 In claim 6, a high thermal conductivity aluminum alloy for casting having a silicon (Si) content of 0.3 wt% or less. Claim 14 A method for manufacturing a high thermal conductivity aluminum alloy for casting, comprising: a step of melting aluminum; and a step of adding iron (Fe) and nickel (Ni) to the melted aluminum; wherein the step of adding iron (Fe) and nickel (Ni) comprises adding nickel (Ni) 1.0 to 1.3 wt%, iron (Fe) 0.3 to 0.9 wt%, manganese (Mn) 0.1 to 0.4 wt%, and the remainder being aluminum (Al), based on 100 wt% of the total alloy; and wherein the step of adding iron (Fe) and nickel (Ni) comprises adding the nickel and iron (Ni+Fe) such that the sum of the nickel and iron contents is 1.6 to 1.9 wt%. Claim 15 delete Claim 16 delete Claim 17 A method for manufacturing a high thermal conductivity casting aluminum alloy according to claim 14, wherein the alloy manufactured above has a fraction of FeNiAl9 in the eutectic phase of 5 wt% or more. Claim 18 In claim 17, a method for manufacturing a high thermal conductivity casting aluminum alloy, wherein the alloy manufactured above has a fraction of 94 wt% or more of the Al matrix phase. Claim 19 A method for manufacturing a high thermal conductivity casting aluminum alloy according to claim 18, wherein the step of adding iron (Fe) and nickel (Ni) satisfies a copper (Cu) content of 0.2 wt% or less, a magnesium (Mg) content of 0.3 wt% or less, and a silicon (Si) content of 0.3 wt% or less, based on 100 wt% of the total alloy.

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