KR100744271B1 - An aluminum-copper clad material and a method for manufacturing the material, and a heat sink - Google Patents

Abstract

In the aluminum-clad cladding material of the present invention, the aluminum-based member and the copper-based member are clad with an insert material made of pure aluminum or a JIS 100 aluminum alloy. The heat sink includes a heat dissipation part made of aluminum-based material, cut out of the surface layer portion on one surface side, and having a plurality of tongue-shaped fins, and a heat diffusion part made of copper-based material and bonded closely to the other surface side of the heat dissipation part. .

Description

An aluminum-copper clad material and a method for manufacturing the material, and a heat sink

1 is a cross-sectional view of an aluminum-copper clad material of the present invention.

FIG. 2 is a cross-sectional view of a cooling tube that is an example of processing of the aluminum-copper clad material of FIG. 1. FIG.

3 is a perspective view illustrating a test heat sink.

4 is a cross-sectional view showing an embodiment A of a heat sink of the present invention.

5 is an explanatory diagram showing a step of manufacturing the heat sink of Example A;

6 is an explanatory diagram showing another manufacturing process of the heat sink of Example A;

7 is a perspective view showing an embodiment B of a heat sink of the present invention.

8 is an explanatory diagram showing a step of manufacturing the heat sink of Example B;

9 is an explanatory diagram showing another manufacturing process of the heat sink of Example B;

10 is a cross-sectional view showing an embodiment C of a heat sink of the present invention.

11 is a front view of a heat sink of Example D of the present invention, and a sectional view showing a manufacturing process thereof.

12 is a cross-sectional view showing an embodiment E of a heat sink of the present invention.

Fig. 13 is a cross-sectional view showing an embodiment F of the heat sink of the present invention.

The present invention relates to an aluminum-copper clad material which is preferably used as a material of, for example, a heat exchanger, a radiator, a heat pipe, a heat sink, and the like, and a manufacturing method thereof. The present invention also relates to a heat sink which is preferably used for cooling a heat sink, in particular a heating device of various electronic devices.

Heat exchangers, radiators, heat pipes, and heat sinks are widely used in the electronics industry, the communications equipment industry, and the transportation equipment industry such as automobiles and aircrafts. These require excellent heat transfer performance, as well as light weight and compactness. Therefore, improvement in both surfaces of a material and a shape is tried.

In terms of the material, an aluminum-based material that is light in weight and has a heat-transferability comparable to that of copper has been widely used in place of a copper-based material which is excellent in heat transfer performance and thermal diffusion performance but difficult in weight.

In particular, in aluminum heat exchangers used in the electronics industry, improvements such as an increase in cooling area and an increase in material thickness have been added to improve heat transfer performance. However, these heat exchangers are highly miniaturized, lightweight, and high performance, and it has become difficult to further improve heat transfer performance by increasing the cooling area and increasing the thickness. In addition, when water is used as the working fluid of the heat pipe, the heat exchanger made of aluminum has a problem that the heat pipe performance is deteriorated due to the generation of non-condensable gas.

In terms of shape, in the heat sink, many thin fins are formed on the heat dissipation substrate for the purpose of expanding the heat dissipation area. This type of heat sink, which is usually made of an extruded aluminum product, is advantageous for rapidly discharging the heat generated by the heat generating device in an electronic apparatus such as a computer in which many heat generating devices are assembled. In the heat sink as described above, it is important to increase the heat dissipation area in order to improve the heat dissipation performance. In order to increase the heat dissipation area, it is necessary to increase the fin, thin the fin, narrow the fin spacing, and increase the number of fins. However, it is difficult to manufacture such a fin-shaped heat sink due to limitations in extrusion technology.

In order to discharge heat quickly, it is not necessary to improve the fin function alone, but it is necessary to improve the thermal diffusion function of the substrate in contact with the heat generating device. By thickening the substrate, the thermal diffusion function can be improved. However, since the installation space of the heat sink is limited by the miniaturization of the whole apparatus, when the board is thickened, the fin height must be lowered, so that the heat dissipation area is reduced. In addition, the thickening of the substrate is contrary to the weight reduction of the device.

An object of the present invention is to provide an aluminum-copper clad material which is excellent in heat dissipation performance and is preferably used for heat sinks and the like.

Another object of the present invention is to provide the aluminum-copper cladding material.

In addition, another object of the present invention to provide a heat sink that can improve the heat dissipation performance without increasing the size or weight.                         

According to a first aspect of the present invention, an aluminum-clad cladding material has an aluminum-based member, a copper-based member, and an insert material made of pure aluminum or a JIS 1000-based aluminum alloy, wherein the aluminum-based member and the copper-based member are the inserts. Clad through ashes. Since the aluminum-copper cladding material of the present invention is clad with the aluminum-based member through an insert material made of pure aluminum or JIS1000-based aluminum alloy, which is easy to be friendly to the copper-based member even cold, the aluminum-copper cladding material is used to Formation is suppressed and it has high bonding force.

It is preferable that the said copper-type member consists of oxygen-free copper or phosphate copper. In this case, the inhibitory effect of oxide formation is large and a remarkably excellent bonding force is obtained.

Since the aluminum-copper clad material described above has light weight of aluminum and heat transfer, thermal diffusivity and corrosion resistance of copper, when used as a heat exchanger material, it exceeds aluminum while suppressing the weight increase caused by the copper material. Heat transfer performance can be obtained. Moreover, by using it so that a copper type member may be arrange | positioned in the part which is easy to corrode, corrosion resistance similar to copper is obtained.

According to another aspect of the present invention, in the method for producing an aluminum-copper clad material, an insert material made of pure aluminum or a JIS 100 aluminum alloy is joined to a copper-based member by cold rolling to obtain two joined members. The aluminum-based member is joined by cold or hot rolling to obtain three bonded parts, and the two joined members before heat-bonding the aluminum-based member to the insert material by cold or hot rolling are subjected to heat treatment, or Heat treatment is performed to the said joined three members after joining an aluminum type member to an insert material by cold or hot rolling.

According to this method, even if cold joining of the insert material which is in direct contact with the copper-based member is obtained, high bonding strength is obtained, and furthermore, the copper-based member and the aluminum-based member are satisfactorily joined. Moreover, since it joins by rolling, it is easy to join a large area, has the above-mentioned effect, and can manufacture a wide and long aluminum-copper clad material. Therefore, the heat exchanger material which requires light weight, heat-transfer performance, and corrosion resistance, and requires a large area can be manufactured.

In the said manufacturing method, it is preferable to make the rolling process rate of the said insert material into 30% or more. Moreover, it is preferable to make the rolling process rate of the said aluminum type member into 40% or more. Remarkably excellent joining force is obtained by making the rolling work rate of the said insert material into 30% or more, or making the rolling work rate of the said aluminum type member into 40% or more.

Moreover, it is preferable to perform the said heat processing at 200-400 degreeC. As a result, a remarkably excellent bonding force is obtained.

Further, according to another aspect of the present invention, the heat sink is made of an aluminum-based material and cut out the surface layer portion on one surface side, and a heat dissipation portion formed of a plurality of tongue-shaped fins, and a copper-based material and in close contact with the other surface side of the heat dissipation portion. It characterized in that it comprises a thermal diffusion unit bonded to.

The heat sink has a heat dissipation part made of an aluminum-based material and formed with a plurality of tongue-shaped fins, and a heat diffusion part made of copper material and bonded to the other surface side of the heat dissipation part in close contact with the heat sink, It has both thermal diffusivity and corrosion resistance, and heat transfer performance exceeding aluminum can be realized at a weight increase of less than copper. In particular, since the heat diffusion portion in contact with the heat generating element is composed of a copper-based member, excellent heat diffusibility is exhibited, and an excellent cooling effect can be obtained without increasing the volume of the heat sink even if the conventional fin height is maintained. Therefore, the heat sink is preferably used as a heat sink in an electronic device having a limited installation space.

In the heat sink, the heat diffusion unit is preferably a flat plate. In this case, manufacture of a heat sink is easy. In addition, the heat diffusion unit preferably has a heat exchange medium chamber therein, and a wick is preferably formed on an inner wall of the heat exchange medium chamber. When the heat diffusion medium chamber is provided inside the heat diffusion portion, the heat pipe becomes a heat pipe, and the heat diffusion performance and the heat dissipation performance are further improved.

In addition, since the thermal diffusion portion is formed of a copper-based material having good corrosion resistance, it is also possible to use water as a heat exchange medium.

In the case where the wick is formed on the inner wall of the chamber for the heat exchange medium, the circulation of the heat exchange medium in the chamber is improved by the capillary force, so that the heat diffusion performance and the heat dissipation performance are further improved.

In addition, according to another aspect of the present invention, the heat sink is made of an aluminum-based material and cut out the surface layer portion on one surface side and formed with a plurality of tongue-shaped fins, and a copper-based material and made of pure aluminum on the other side of the heat-dissipating portion. Or a heat diffusion unit joined through an insert material made of JIS1000 aluminum alloy. In this heat sink, oxidation of the copper-based member at the time of joining and production | generation of the compound between different materials are suppressed, and it has high bonding force. In addition, the heat sink also has excellent light weight, heat transfer property, thermal diffusion resistance, and corrosion resistance.

In the heat sink, the heat diffusion unit is preferably a flat plate. In the case where the thermal diffusion portion is a flat plate, the heat sink can be easily manufactured. In addition, the heat diffusion unit preferably has a heat exchange medium chamber therein, and the heat exchange medium chamber preferably has a wick formed on an inner wall thereof. In addition, when the heat diffusion medium chamber is provided inside the heat diffusion unit, the heat pipe becomes a heat pipe, and the heat diffusion performance and the heat dissipation performance are further improved.

In addition, since the thermal diffusion portion is formed of a copper-based material having good corrosion resistance, it is also possible to use water as a heat exchange medium.

In the case where the wick is formed on the inner wall of the chamber for the heat exchange medium, the circulation of the heat exchange medium in the chamber is improved by the capillary force, so that the heat diffusion performance and the heat dissipation performance are further improved.

Still other objects and features of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

<Aluminum-copper clad material>

As shown in FIG. 1, the aluminum-copper cladding material 1 which concerns on this invention is the insert material 12 which consists of pure aluminum or JIS1000-type aluminum alloy between the aluminum-based member 11 and the copper-based member 13 Is interposed.

The composition of the aluminum-based member 11 is not limited at all. For example, high purity aluminum, Al or Al alloy of JIS1000, Al-Cu alloy of JIS2000, Al-Mn alloy of JIS3000, Al-Si alloy of JIS4000, Al-Si alloy of JIS4000, Al of JIS5000 -Mg type alloy, JIS6000 type Al-Si-Mg type alloy, JIS7000 type Al-Zn-Mg-Cu type alloy, Al-Zn-Mg type alloy, etc. can be used widely.

The composition of the copper-based member 13 is also not limited. However, oxygen-free copper or phosphorus phosphate copper can be recommended from the point which can suppress formation of an oxide or a compound with aluminum.

In addition, the insert material 12 should be made of pure aluminum or JIS1000-based aluminum alloy having a small amount of additional elements that are easy to be affinity with the copper-based member 13 which is a dissimilar metal even in cold. Particularly preferred insert material is an alloy having a purity of JIS1050 alloy or higher among high purity aluminum and JIS 1000 series aluminum having a purity of 99.90% or more.

By using these insert materials, high bonding strength can be obtained even by cold bonding. Thermal resistance is generated between the aluminum-based member 11 and the copper-based member 13 due to the difference in thermal conductivity. However, thermal resistance is reduced by interposing pure aluminum or JIS10OO-based aluminum alloy having high thermal conductivity among the aluminum-based materials as the insert material 12 among these members.

<Method for producing aluminum-copper clad material>                     

The aluminum-copper cladding material 1 is produced by, for example, the following method.

First, the insert material 12 is cold rolled and joined to the copper-based member 13. Since the insert material 12 is pure aluminum or a JIS 1000 series aluminum alloy, the deformation resistance is small, and it is easy to be affinity with the copper-based member 13 even in cold form, and the bonding property is good. In addition, since the copper-based member 13 and the insert member 12 are joined by cold rolling, oxidation of the copper-based member 13 is suppressed and the formation of a compound with the insert material 12 component is also achieved. It can be suppressed and the cause which inhibits conjugation can be excluded. The cold rolling work rate is preferably 30% or more in order to obtain sufficient bonding force, but on the other hand, if it exceeds 70%, the material may be broken by work hardening. Particularly preferred processing rate is 40 to 70%.

Next, the aluminum-based member 11 is cold rolled or hot rolled to the insert material 12 side. In this rolling, since the surface of the said copper-type member 13 is already coat | covered with the insert material 12, and is interrupted | blocked from the atmosphere, the rolling may be either hot or cold. The rolling work rate is preferably 40% or more in order to obtain good compressibility, and sets an appropriate rolling work rate according to the required final thickness. In the case of hot rolling, the rolling temperature is preferably 100 to 350 ° C. so as not to grow the compound phase at the interface between the copper-based member 13 and the insert material 12, and then rolling is preferably performed immediately after reaching the target temperature. Do. In this rolling, since the insert material 12 and the aluminum type member 11 are the same kind of aluminum, it is easy to mutually bond, and it is joined satisfactorily, and the aluminum type member 11 and the copper type member 13 are the insert materials ( Through 12).                     

In the above-described series of joining processes, before joining the aluminum-based member 11 onto the insert material 12, heat treatment is performed on the joined two members to form the copper-based member 13 and the insert material 12. Improve adhesion Alternatively, after the aluminum-based member 11 is bonded onto the insert material 12, the bonded three members are subjected to heat treatment, so that the aluminum-based member 11, the insert material 12 and the copper-based member 13 are formed. To increase the adhesion of the third party. In order to suppress the growth of the compound at the interface between the copper-based member 13 and the insert material 12 and to obtain these high bonding properties, the heat treatment is preferably performed in the range of 200 to 400 ° C. The minimum with especially preferable heat processing temperature is 220 degreeC, and an upper limit is 300 degreeC. The heat treatment time is preferably fixed at 1 hour or less so as not to grow the compound phase. If the thickness of a compound phase is controlled to 10 micrometers or less by heat processing conditions, favorable joining property can be obtained.

Such heat treatment is performed after the insert material 12 is rolled, before the aluminum base member is rolled, or after the aluminum base member 11 is rolled, thereby producing a firmly bonded aluminum-copper clad material. However, in the case where the rolling of the aluminum-based member 11 is performed cold, it is preferable to carry out after the rolling of the aluminum-based member 11, that is, after the trilateral bonding.

The aluminum-copper cladding material of the present invention can be preferably used as a heat exchanger material because it has both light weight of aluminum and heat transfer, thermal diffusion, and corrosion resistance of copper.

For example, the aluminum-copper cladding material may be made of a tube for heat exchange as shown in FIG. 2. Since the heat exchanger tube has the copper-based member 13 side of the aluminum-clad cladding material positioned on the inner surface, only the copper-based member 13 having high corrosion resistance contacts the refrigerant, and therefore not only heat transfer performance but also corrosion resistance. It can be an excellent tube. Further, as described later in detail, a heat sink in which a snow fin is formed may be produced.

(Example)

The specific Example of the aluminum-copper clad material of this invention and its manufacturing method is demonstrated.

As the copper-based member 13, an 8 mm thick oxygen-free copper plate and a phosphoric acid copper plate were prepared at 100 mm x 150 mm.

As the insert material 12, three types of pure aluminum plates of thickness 0.1mm, 0.5mm and 1.0mm were prepared at a purity of 99.999% and 94 mm x 150 mm. As an aluminum type member, it consists of JISA1100 or JISA6063, and prepared the aluminum alloy plate of thickness 2.0mm, 5.0mm, 10.0mm, and 15.0mm by 100 mm x 200 mm, respectively.

The combination of these materials is shown in Table 1.

In manufacturing the clad material, first, the insert material was laminated on the copper-based member and joined by cold rolling at the processing rates shown in Table 1. Subsequently, about Examples 1-13, it maintained at the temperature shown in Table 1 for 1 hour, and made intermediate heat processing, and Examples 14-17 advanced to the next process, without performing this intermediate heat processing.

Next, with respect to the copper-type member which clad the insert material, the aluminum-type member was piled up on the insert material side, and it cold-rolled or hot-rolled at 500 degreeC at the processing rate shown in Table 1, and bonded them.

In addition, about Examples 14-17 which did not perform the intermediate heat processing just before, it maintained at the temperature shown in Table 1 for 1 hour, and performed the final heat processing.

Examples 1 to 13 subjected to the intermediate heat treatment did not perform this final heat treatment.

On the other hand, as Comparative Examples 1 to 4, the clad material was produced by hot rolling the aluminum member and the copper member at the temperatures and processing rates shown in Table 1 without interposing the insert material. About these clad materials, the bonding rate and the bonding strength were evaluated.

The joining ratio was examined by the ultrasonic flaw test to determine the joining success and failure rate (%) = (unbonded area / measured area) x 100. In addition, the joint strength was freely dropped 20 times on the steel floor from the height of 1.5m, and evaluated by the fractured state or the fracture state. These evaluation results are shown in Table 1.                     

In addition, in the three kinds of aluminum-copper clad materials of Examples 2, 8, and 16 and the aluminum alloy single member having the same thickness as those of the clad materials, respectively, a test heat sink 20 shown in FIG. The performance was evaluated by comparison.

The test heat sink 20 cuts a flat plate of 80 mm (W) x 60 mm (D) from the clad material, respectively, and pins three rows of snow fins 22 having a height (FH) of 30 mm on the aluminum-based member side. 2 mm of pitch FP was formed, and the copper-based member side was made into the flat base part 21. FIG. Also in an aluminum alloy single material, it cut out to the same dimension, and cut | disconnected and formed the pin 22 in one surface side, and made the other surface side into the flat base part 21.

As shown in FIG. 3, the heat source 23 is attached to the center of the rear surface of the base portion 21 of each test heat sink 20 in close contact with the air, and the wind speed is 2m / from above the fin 22 side. Exhaled sec cooling air. In this state, the temperature of the upper portion 24 of the heat source 23 and the cooling air and the input heat amount w of the heat source 23 are measured, and the thermal resistance of each test heat sink is expressed by the following equation (fl). The heat transfer performance was evaluated by obtaining R).

R = (Te-Tair) / Q... (f1)

However, R: heat resistance (° C / w) of the heat sink, Te: temperature (° C) in the upper portion 24 of the heat source 23, Tair: temperature (° C) of cooling air, Q: heat source ( 23) is the input calorific value w.

Table 2 shows the results of these evaluations.                     

From the results of Table 1, it was confirmed that the dissimilar metals were joined together in the entire surface of the aluminum-copper clad material with the insert material interposed therebetween to obtain high bonding strength. In addition, from the results in Table 2, it was confirmed that the excellent heat transfer performance exceeding aluminum was achieved without a decrease in heat transfer performance due to the bonding.

<Heat sink>

4-11 show Examples A-D of the heat sink which concerns on this invention comprised with the heat dissipation part which consists of aluminum type material, and the heat-diffusion part which consists of copper type material.

12-13 show Examples E-F of the heat sink which concerns on this invention produced using the aluminum-copper cladding material 1 mentioned above. These heat sinks consist of a heat dissipation part made of an aluminum-based material and a heat diffusion part made of a copper-based material bonded to the heat dissipation part through an insert material. The detail of the shape of these heat sinks and the outline of a manufacturing method are shown below.

(Example A)

The heat sink 31 shown in FIG. 4 consists of the heat dissipation part 41 in which the many snow-shaped fin 42 was formed in one surface side, and the flat plate heat-diffusion part 51 joined to the other surface side.

For example, as shown in FIG. 5, the heat sink 31 joins the plate-shaped aluminum base member 43 and the plate-shaped copper base member 51, and then forms the tongue-like fins 42 on the aluminum plate 43. It is manufactured by performing a process.

In the said manufacturing process, since the joining method is joining of flat plates, it is based on well-known methods, such as rolling, friction joining, ultrasonic joining, and soldering. Moreover, the process which cuts out the tongue 42 is also based on a well-known method.

In addition, as shown in FIG. 6, the heat sink 31 is also manufactured by first forming a snow fin 42 on an aluminum plate to produce a heat dissipation portion 41, and then joining it to a copper-based material plate 51. FIG. can do. In the case of manufacturing by this process, joining of the heat radiating part 41 and the thermal-diffusion part 51 must follow a method other than rolling.

As for the thickness of the aluminum flat plate 43 before a process, 1-10 mm is preferable. If the thickness is less than 1 mm, the fin height is lowered and the heat dissipation performance is lowered. On the contrary, if the thickness exceeds 10 mm, the processing limit of the thin fin is exceeded.

In addition, the thickness of the flat copper-based member constituting the thermal diffusion section 51 is preferably 1.5 to 8 mm in order to ensure that the weight is not excessive while ensuring excellent thermal diffusion performance as the flat thermal diffusion section.                     

(Example B)

The heat sink 32 shown in FIG. 7 consists of the heat dissipation part 41 in which the many snow-like fin 42 was formed in one surface side, and the heat-diffusion part 61 joined to the other surface side. The heat spreader 61 has a hollow chamber 62 for heat exchange medium. The heat sink 32 turns the chamber 62 into a vacuum and seals a heat exchange medium such as water into the chamber 62 to form a heat pipe.

For example, as shown in FIG. 8, the heat sink 32 is manufactured by joining a heat dissipation portion 41 formed by cutting a snow fin 42 on an aluminum flat plate and a heat diffusion portion 61 having a hollow portion. Or you may form the snow plate 42 after joining similarly to the process shown in FIG. Alternatively, as shown in FIG. 9, a cross-sectional U-shaped member 65 made of a copper-based material is further bonded to the heat sink 31 in which the flat plate thermal diffusion portion 51 and the heat dissipation portion 41 of FIG. 4 are joined. Even if it is possible, the chamber 62 for the heat exchange medium can be formed, and a heat sink 32 'having the same appearance can be manufactured. In this case, the thermal diffusion portion 64 is constituted by the flat plate thermal diffusion portion 51 and the cross-sectional U-shaped member 65.

In this embodiment, the method of joining the heat dissipating portion 41 and the heat spreading portion 61 or the U-shaped member 65, the method of forming the snow fins 42, and the dimensions of the heat dissipating portion 41 are described above. According to example A. However, since the heat diffusion efficiency and heat dissipation performance of the heat diffusion parts 61 and 64 are improved by using the heat diffusion parts 61 and 64 in these heat sinks 32 and 32 'as heat pipes, The thickness of 64 may be thinner than the flat plate thermal diffusion part 51 in the heat sink 31, and 1.2-5 mm is preferable. In addition, since the thermal diffusion portion 61 is made of a copper-based material, it is excellent in corrosion resistance, and water can be used as a heat exchange medium.

(Example C)

10 shows a heat sink of Example C. FIG. In the heat sink 33, as in the heat sink 32 of the embodiment B, the heat spreader 66 is a heat pipe. However, this heat sink 33 differs from the previous heat sink 32 in that a wick is formed in the inner wall of the chamber 63 for heat exchange medium. Thus, by attaching a wire mesh or sintering copper powder to the wick to form a wick on the inner wall of the chamber 63 for heat exchange medium, the circulation in the chamber of the heat exchange medium is improved by the capillary force, and the heat pipe By improving the performance of the heat sink, the heat diffusion performance and the heat dissipation performance of the heat sink can be improved.

(Example D)

FIG. 11 shows a heat sink 34 in which a heat pipe 73 in which a heat exchange medium 72 is sealed is embedded in the heat spreader 71.

In the heat sinks 32 and 33 of the embodiments B and C, the heat diffusion parts 61 and 66 themselves constitute a heat pipe, and after assembling each component, a vacuum is sucked or a heat exchange medium is introduced to complete the heat pipe. It is a structure to let. For this reason, the opening part for suction and introduction is exposed to the outer surface of a heat sink.

On the other hand, in the heat sink 34 of this embodiment, after introducing a heat exchange medium and closing an opening part to complete the heat pipe 73, the heat pipe 73 is embedded in the heat diffusion part 71 in its state. The outer structural member is assembled to form the snow pins 42. Therefore, the heat pipe 73 is enclosed in the thermal diffusion part 71 and is not visible from the outside.

The said heat sink 34 is manufactured by the process shown in FIG. 11, for example.

That is, the completed heat pipe 73 is loaded into the recessed portion 75 of the outer shell member 74. The concave portion 75 corresponds to the outer shape of the heat pipe 73, and the heat pipe 73 is accommodated in the intimate state in the concave portion 75. Thereafter, for example, the outer shell member 74 in which the heat pipe 73 is loaded is bonded to the heat sink 31 to which the flat plate thermal diffusion portion 51 and the heat dissipation portion 41 are joined.

Such a heat pipe embedded heat sink 34 is advantageous in that the reliability of the product can be improved by attaching a material having a heat pipe performance in advance.

(Example E)

FIG. 12 shows a heat sink 35 having a heat dissipation portion 81 having a tongue 42 formed therein, a heat diffusion portion 82 attached to the heating element, and an insert material 12 interposed therebetween to join them. .

This heat sink 35 is produced by forming the tongue-like fin 42 on the surface of the aluminum-based member 11 of the aluminum-clad cladding material 1 previously produced, and the copper-based member 13 is in a flat plate shape as it is. It becomes the thermal diffusion part 82. The preferable thickness of each part before a process is based on Example A.

The heat sink 35 is excellent in heat diffusion performance and lightweight in the same manner as in Example A. In addition, since the heat dissipation portion 81 and the heat diffusion portion 82 of the dissimilar metal are joined through the insert material 12, the bonding strength is excellent.                     

(Example F)

FIG. 13 shows a heat sink 36 in which a chamber 84 for heat exchange medium is formed in the heat spreader 83. In this heat sink 36, the chamber 84 for heat exchange media is formed by adding and joining the cross-sectional U-shaped member 65 which consists of copper-type materials to the heat sink 35 of Example E. FIG. The copper-based member 13 and the U-shaped member 65 in the cladding material 1 constitute the thermal diffusion portion 83. The preferable thickness of each part before a process is based on Example B.

The heat sink 36 is excellent in bonding strength because the heat dissipation portion 81 and the heat dissipation portion 83 of the dissimilar metal are joined through the insert material 12 in addition to the excellent heat diffusion performance and light weight of the embodiment B. Do.

In the heat sink 36, it is possible to form a wick appropriately on the inner wall of the chamber 84 for the heat exchange medium as in the heat sink 33 of FIG.

In each of the heat sinks 31, 32, 32 ′, 33, 34, 35, 36, the composition of the aluminum-based material constituting the heat dissipation portions 41, 81 is not limited at all. For example, high-purity aluminum, A1 or A1 alloy of JIS1000, Al-Cu alloy of JIS2000, Al-Mn alloy of JIS3000, Al-Si alloy of JIS4000, Al-Mg alloy of JIS5000, JIS6000 Al-Si-Mg-based alloys, Al-Zn-Mg-Cu-based alloys and Al-Zn-Mg-based alloys of the JlS7000-based alloys can be widely used. Among these, especially JlS6000 type alloy can be recommended in consideration of shaping | molding a snow-shaped pin.

In addition, the composition of the copper-based material constituting the thermal diffusion portions 51, 61, 62, 65, 66, 71, 82, 83 is also not limited. Tough pitch copper, oxygen-free copper, or phosphate copper can be used widely. Among them, oxygen-free copper or copper phosphate can be recommended, in particular, in view of suppressing formation of a compound with an oxide or aluminum at the time of joining with the heat dissipation portion 41 which is a dissimilar metal.

In Examples E to F, the insert material 12 is based on the insert material of the aluminum-copper clad material described above, and recommends an alloy having a purity of 1050 alloy or higher among high purity aluminum of 99.90% or higher and JIS1000 aluminum. Can be.

This application is in accordance with the claims of priority in Japanese Patent Application No. 2000-66807, filed March 10, 2000 and Japanese Patent Application No. 2000-66942, filed March 10, 2000. It forms part of this application as it is.

The terms and expressions used herein are for descriptive purposes only and are not intended to be limiting to interpretation, but do not exclude any equivalents of the features shown and described herein, but are not to be construed as limiting the scope of the claims. It should be recognized that modifications are also allowed.

Claims (18)

Aluminum base member, A copper-based member, It is made of insert material made of pure aluminum or JIS100 aluminum alloy, An aluminum-copper clad material, wherein the aluminum-based member and the copper-based member are clad through the insert material. The method of claim 1, The copper-based member is aluminum-copper clad material made of oxygen-free copper or phosphate copper. Bonding an insert material made of pure aluminum or JIS1000 aluminum alloy to the copper-based member by cold rolling to obtain two joined members; Performing heat treatment on the joined two members; And Cold- or hot-rolling the aluminum-based member to the insert material to obtain the joined three members. Bonding an insert material made of pure aluminum or JIS1000 aluminum alloy to the copper-based member by cold rolling to obtain two joined members; Cold- or hot-rolling an aluminum-based member to the insert member to obtain three joined members; And Method of producing an aluminum-copper clad material comprising the step of performing a heat treatment on the bonded three members. The method according to claim 3 or 4, Rolling processing rate of the insert material is a manufacturing method of aluminum-copper clad material to 30 to 70%. The method according to claim 3 or 4, The rolling process rate of the said aluminum type member is a manufacturing method of the aluminum-copper cladding material made into 40 to 58%. The method of claim 5, The rolling process rate of the said aluminum type member is a manufacturing method of the aluminum-copper cladding material made into 40 to 58%. The method according to claim 3 or 4, The said heat processing is a manufacturing method of the aluminum-copper cladding material performed at 200-400 degreeC. The method of claim 5, The said heat processing is a manufacturing method of the aluminum-copper cladding material performed at 200-400 degreeC. The method of claim 6, The said heat processing is a manufacturing method of the aluminum-copper cladding material performed at 200-400 degreeC. Comprising a heat dissipation portion made of an aluminum-based material, cut out the surface layer portion on one surface side, and formed with a plurality of tongue-shaped fins, and a heat diffusion portion made of a copper-based material and bonded closely to the other surface side of the heat dissipation portion. Featuring a heat sink. The method of claim 11, The heat spreader is a heat sink. The method of claim 11, And the heat spreader has a chamber for a heat exchange medium therein. The method of claim 13, The heat exchange medium chamber is a heat sink having a wick formed on the inner wall. A heat dissipation part made of an aluminum-based material and formed by cutting a surface layer part on one surface side and forming a plurality of tongue-shaped fins, A heat sink made of a copper-based material and having a heat diffusion portion joined to an other surface side of the heat dissipation portion through an insert material made of pure aluminum or a JIS 1000-based aluminum alloy. The method of claim 15, The heat spreader is a heat sink. The method of claim 15, And the heat spreader has a chamber for a heat exchange medium therein. The method of claim 17, The heat exchange medium chamber is a heat sink having a wick formed on the inner wall.

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