Aluminum radiator of copper-aluminum welding structure and copper-aluminum welding process

Abstract

The aluminum radiator of the copper-aluminum welding structure comprises an aluminum radiator body of the copper-aluminum welding structure, the radiator body comprises an aluminum radiating base, a heat pipe groove used for positioning a heat pipe is formed in the upper surface of the aluminum radiating base, copper powder particles are fixed to the heat pipe groove through high-speed impact jetting, and a copper face substrate is formed; a plurality of heat dissipation fins are arranged on the lower surface of the aluminum heat dissipation base, heat pipes are embedded in the heat pipe grooves, and a copper-aluminum welding process is adopted for manufacturing the heat dissipation device and comprises the following steps that firstly, copper powder is sprayed to the heat pipe grooves; 2, pressing a heat pipe; step 3, dispensing a first solder; 4, welding the heat pipe; step 5, surface processing; and step 6, testing.

Description

Technical Field

[0001] The invention relates to the technical field of radiator processing, in particular to an aluminum radiator with a copper-aluminum welding structure and a copper-aluminum welding process. Background Art

[0002] With the continuous development of electronic products, the heat generated by the internal chips is getting higher and higher, and the traditional heat dissipation method can no longer meet the demand. Heat pipe technology has been widely used in radiator design due to its advantages such as extremely high thermal conductivity, good isothermal properties, and long-distance heat transfer. Therefore, the connection process between the radiator and the heat pipe becomes particularly important, which directly affects the heat dissipation efficiency and overall performance of the radiator.

[0003] In the prior art, heat pipes are generally connected and installed on the radiator through two processes: "nickel plating + soldering" or "tube pressing + epoxy resin filling". However, the "nickel plating + soldering" process requires the product to be electroplated as a whole or partially, which increases the production cost of the product and the corresponding process steps. After the product is made using the "tube pressing + epoxy resin filling" process, since the high temperature resistance of epoxy resin is 180°C, with the continuous development of electronic products, the heat generated by the internal chips is also increasing. The high temperature resistance of only 180°C may not meet the high temperature resistance requirements for high-performance products. Summary of the invention

[0004] In order to solve the above problems, the present invention provides an aluminum radiator with a copper-aluminum welding structure and a copper-aluminum welding process.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: The present invention relates to an aluminum radiator with a copper-aluminum welding structure, including a heat pipe welded to an aluminum heat sink, the radiator includes an aluminum heat sink, the upper surface of the aluminum heat sink is provided with a heat pipe groove for positioning the heat pipe, a supersonic cold spraying machine is used to fix copper powder particles on the heat pipe groove by high-speed impact spraying to form a copper surface base, a plurality of heat dissipation fins are provided on the lower surface of the aluminum heat sink, and a heat pipe is embedded in the heat pipe groove. Cold spraying technology is a new material surface modification technology that is easy to operate, safe and pollution-free. Cold spraying refers to the process of shooting copper powder into the heat pipe groove by supersonic gas-solid two-phase airflow at room temperature or a lower temperature to form a dense copper surface coating.

[0006] A copper-aluminum welding process for manufacturing an aluminum radiator with a copper-aluminum welding structure comprises the following steps:

[0007] Step 1: prepare an aluminum heat sink, which is made of a material that dissipates heat quickly but conducts heat slowly. A plurality of heat dissipation fins arranged at equal intervals are integrally formed on the lower surface of the aluminum heat sink, and a heat pipe groove for accommodating a heat pipe is prepared on the upper surface of the aluminum heat sink;

[0008] Step 2, spraying copper powder on the heat pipe slot: fixing the copper powder particles on the heat pipe slot by high-speed impact spraying, forming a rough copper surface substrate on the surface of the heat pipe slot;

[0009] Step 3, pressing the heat pipe: pressing the heat pipe into the heat pipe groove of the aluminum heat sink by mechanical processing, and making the flattened surface of the heat pipe flush with the upper surface of the aluminum heat sink;

[0010] Step 4, welding the heat pipe: applying a first solder between the heat pipe and the copper substrate, heating and melting the first solder to fix the heat pipe in the heat pipe groove, forming a welding surface between the heat pipe and the heat pipe groove;

[0011] Step 5: Surface processing: Grind the heat pipe and welding surface to make the heat pipe and welding surface flush with the upper surface of the aluminum heat sink;

[0012] Step 6. Testing: Test the product.

[0013] Preferably, the aluminum heat sink is made of aluminum material, and the heat pipe is a copper pipe.

[0014] Preferably, the first solder fills the gap and air bubble holes between the heat pipe and the heat pipe groove, so that the heat pipe and the heat pipe groove fit tightly without any gap.

[0015] Preferably, the first solder is solder paste.

[0016] Preferably, there are a plurality of heat pipes, and the number of the heat pipe slots corresponds to the number of the heat pipes.

[0017] Preferably, the heat pipe comprises a welding section, a heat dissipation section and a connecting section for connecting the welding section and the heat dissipation section; the welding section is accommodated in the heat pipe groove, and the welding section is tightly fitted to the copper surface substrate.

[0018] Preferably, a plurality of the heat pipe grooves are arranged at intervals, and the welding section is provided with a welding plane and a welding side surface. When the heat pipe is accommodated in the heat pipe groove, the welding plane is flush with the bottom of the heat pipe groove, and first solder is provided on both sides of the heat pipe groove, and the welding side surfaces are tightly fitted with the first solder to realize a seamless welding arrangement of the heat pipe and the heat pipe groove.

[0019] The beneficial effect of the present invention is that in three tests with the same parameter standard, it can be concluded that the performance, pull-out force, degree of fit and appearance of the products made by the three different processes after the copper-aluminum welding process are no different from those of the existing "nickel plating + soldering" and "tube pressing + epoxy resin filling" processes.

[0020] Compared with the "nickel plating + tin soldering" process, the copper-aluminum welding process of the present invention only requires spraying copper powder in the heat pipe groove, while the "nickel plating + tin soldering" process requires overall or partial electroplating of the product. In comparison, the production cost of the present invention is lower and the process is simpler.

[0021] Compared with the "pressing tube + filling epoxy resin" process, the copper-aluminum welding process of the present invention has the advantage that the product can withstand high temperatures (the welding high temperature resistance is 240°C, and the epoxy resin high temperature resistance is 180°C), which improves the high temperature resistance of the product and further improves the performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the product of the present invention.

[0023] Figure 2 It is a schematic diagram of the explosion structure of the product of the present invention.

[0024] Figure 3 It is a schematic cross-sectional view of the product of the present invention.

[0025] Figure 4 The present invention Figure 3 Enlarged view of point A in .

[0026] Figure 5 It is a schematic diagram of the process steps of the present invention.

[0027] Figure 6 It is a graph of the performance test results of the product of the present invention.

[0028] Figure 7 It is a drawing result diagram of the pull-out force test of the product of the present invention.

[0029] Reference numerals

[0030] 1. Aluminum heat sink; 11. Heat pipe slot; 2. Heat sink fins; 3. Heat pipe. DETAILED DESCRIPTION

[0031] See also Figure 1-7 As shown, the present invention relates to an aluminum radiator with a copper-aluminum welding structure, comprising a heat pipe 3 and a radiator, wherein the radiator comprises an aluminum heat sink 1 and heat sink fins 2, wherein the heat sink fins 2 are arranged on the aluminum heat sink 1, wherein a heat pipe groove 11 for positioning the heat pipe 3 is opened on the upper surface of the aluminum heat sink 1, copper powder particles are fixed on the heat pipe groove 11 by high-speed impact spraying, or nano-copper slurry is coated on the surface of the heat pipe groove 11 to form a rough copper surface substrate, and the heat pipe 3 is embedded in the heat pipe groove 11.

[0032] The aluminum radiator with copper-aluminum welding structure is manufactured by using copper-aluminum welding process. The process steps are as follows:

[0033] Step 1: prepare an aluminum heat sink, which is made of a material with fast heat dissipation but slow heat conduction. A plurality of heat dissipation fins 2 arranged at equal intervals are integrally formed on the lower surface of the aluminum heat sink 1, and a heat pipe groove 11 for accommodating a heat pipe is prepared on the upper surface of the aluminum heat sink 1;

[0034] Step 2: Spraying copper powder on the heat pipe slot: fixing the copper powder particles on the heat pipe slot 11 by high-speed impact spraying, or coating the surface of the heat pipe slot 11 with nano copper slurry to form a rough copper surface substrate;

[0035] Step 3, pressing the heat pipe 3: placing the heat pipe 3 into the heat pipe groove 11, pressing the heat pipe 3, so that the heat pipe 3 is tightly matched with the copper powder and the heat pipe groove 11;

[0036] Step 4, welding the heat pipe 3: a first solder is applied between the heat pipe and the copper substrate, and the first solder is melted after heating to fix the heat pipe in the heat pipe groove, so that a welding surface is formed between the heat pipe and the heat pipe groove; a better bonding force is generated by the rough copper substrate and the heat pipe, and the first solder has a better bonding force, so that the heat pipe 3 is welded and fixed in the heat pipe groove 11;

[0037] Step 5: Surface processing: Process the welded surface and grind the heat pipe 3 and the welding surface;

[0038] Step 6. Testing: Test the product to check its performance, pull-out force, and the coordination between processes.

[0039] Furthermore, in this embodiment, the aluminum heat sink 1 is made of aluminum material, and the heat pipe 3 is a copper pipe.

[0040] The first solder is solder paste, and the first solder fills the gap and air bubble holes between the heat pipe 3 and the heat pipe groove 11, so that the heat pipe 3 and the heat pipe groove 11 are tightly matched without gaps.

[0041] In this solution, the heat pipe 3 is L-shaped or strip-shaped. When the heat pipe 3 is L-shaped, it includes a welding section, a heat dissipation section, and a connection section for connecting the welding section and the heat dissipation section; the welding section is accommodated in the heat pipe groove 11, and the welding section is tightly fitted with the copper surface. When the heat pipe 3 is strip-shaped, the surface of the heat pipe 3 flush with the upper surface of the aluminum radiator is the heat dissipation section, and the heat pipe 3 connected to the copper surface is the welding section.

[0042] There are multiple heat pipes 3, and the number of the heat pipe grooves 11 corresponds to the number of the heat pipes 3. The multiple heat pipe grooves 11 are arranged at intervals, and the welding section is provided with a welding plane and a welding side surface. When the heat pipe 3 is accommodated in the heat pipe groove 11, the welding plane is flush with the bottom of the heat pipe groove 11, and both sides of the heat pipe groove 11 are provided with a first solder, and the welding side surfaces are closely fitted with the first solder to realize a seamless welding arrangement of the heat pipe 3 and the heat pipe groove 11.

[0043] In this embodiment, two processes of "nickel plating + soldering" and "tube pressing + epoxy resin filling" in the prior art are used for production, and products are obtained by using different methods. After production, the performance of products of the three welding processes under the same parameter standard test is compared.

[0044] In the performance test of the product, the three welding processes use the same number of heating blocks, fan parameters (specifications, quantity, wind pressure, air volume), test power and test time. Figure 6 As shown. The performance test results of the processed products show that the temperature of the same position of the "copper-aluminum combination welding" product of the present invention is lower than that of the "nickel plating + tin soldering" product and the "pressing tube + filling epoxy resin" product. Therefore, it can be concluded that the performance of the "copper-aluminum combination welding" process of the present invention is no different from that of the "nickel plating + tin soldering" product and the "pressing tube + filling epoxy resin" product in the same parameter standard performance test.

[0045] In the product pull-out test, the three welding processes use the same parameters such as product size and weight. Figure 7 The results of the pull-out force test are as follows: the pull-out force of the "nickel plating + tin soldering" product is 194kgf, the pull-out force of the "pressed tube + filled epoxy resin" product is 210kgf, and the pull-out force of the "copper-aluminum combined welding" product is 211kgf. There is no abnormality in the three welding process products after the pull-out test. Therefore, it can be concluded that the pull-out force of the "copper-aluminum combined welding" product of the present invention is relatively high and can meet the needs of existing products.

[0046] In the process matching degree test of the product, after the matching positions of the products after the three welding processes and the heat pipe 3 were cut open, the heat pipe 3 and the heat pipe groove 11 of the three welding process products were tightly matched without gaps. Among them, in the "copper-aluminum matching welding" product of the present invention, the gaps and bubble holes are filled with solder paste, so that the heat pipe 3 and the heat pipe groove 11 are tightly matched without gaps.

[0047] In this embodiment, the products made by three different processes are tested in three tests with the same parameter standard, and it can be concluded that the product performance, pull-out force, degree of fit, and appearance after the copper-aluminum welding process are no different from those of the existing "nickel plating + soldering" and "tube pressing + epoxy resin filling" processes.

[0048] Compared with the "nickel plating + tin soldering" process, the copper-aluminum welding process of the present invention only requires spraying copper powder in the heat pipe groove 11, while the "nickel plating + tin soldering" process requires the entire product or partial electroplating. In comparison, the production cost of the present invention is lower and the process is simpler.

[0049] Compared with the "pressing tube + filling epoxy resin" process, the copper-aluminum welding process of the present invention has the advantage that the product can withstand high temperatures (the welding high temperature resistance is 240°C, and the epoxy resin high temperature resistance is 180°C), which improves the high temperature resistance of the product and further improves the performance of the product.

[0050] The above implementation modes are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. An aluminum radiator with a copper-aluminum welding structure, characterized in that: The invention comprises welding a heat pipe to an aluminum heat sink, wherein the heat sink comprises an aluminum heat sink, the upper surface of the aluminum heat sink is provided with a heat pipe groove for positioning the heat pipe, copper powder particles are fixed on the heat pipe groove by high-speed impact spraying to form a copper surface base, a plurality of heat dissipation fins are provided on the lower surface of the aluminum heat sink, and a heat pipe is embedded in the heat pipe groove.

2. A copper-aluminum welding process for manufacturing an aluminum radiator with a copper-aluminum welding structure as claimed in claim 1, characterized in that: The following steps are involved: Step 1: prepare an aluminum heat sink, which is made of a material that dissipates heat quickly but conducts heat slowly. A plurality of heat dissipation fins arranged at equal intervals are integrally formed on the lower surface of the aluminum heat sink, and a heat pipe groove for accommodating a heat pipe is prepared on the upper surface of the aluminum heat sink; Step 2, spraying copper powder on the heat pipe slot: fixing the copper powder particles on the heat pipe slot by high-speed impact spraying, forming a rough copper surface substrate on the surface of the heat pipe slot; Step 3, pressing the heat pipe: pressing the heat pipe into the heat pipe groove of the aluminum heat sink by mechanical processing, and making the flattened surface of the heat pipe flush with the upper surface of the aluminum heat sink; Step 4, welding the heat pipe: applying a first solder between the heat pipe and the copper substrate, heating and melting the first solder to fix the heat pipe in the heat pipe groove, forming a welding surface between the heat pipe and the heat pipe groove; Step 5: Surface processing: Grind the heat pipe and welding surface to make the heat pipe and welding surface flush with the upper surface of the aluminum heat sink; Step 6. Testing: Test the product.

3. A copper-aluminum welding process according to claim 2, characterized in that: The aluminum heat sink is made of aluminum material, and the heat pipe is a copper pipe.

4. A copper-aluminum welding process according to claim 1, characterized in that: The first solder fills the gap and air bubble holes between the heat pipe and the heat pipe groove, so that the heat pipe and the heat pipe groove fit tightly without any gap.

5. A copper-aluminum welding process according to claim 2 or 4, characterized in that: The first solder is solder paste.

6. A copper-aluminum welding process according to claim 2, characterized in that: There are a plurality of heat pipes, and the number of the heat pipe slots corresponds to the number of the heat pipes.

7. A copper-aluminum welding process according to claim 1, characterized in that: The heat pipe comprises a welding section, a heat dissipation section and a connecting section for connecting the welding section and the heat dissipation section; the welding section is accommodated in the heat pipe groove, and the welding section is tightly fitted with the copper surface substrate.

8. A copper-aluminum welding process according to claim 7, characterized in that: A plurality of the heat pipe grooves are arranged at intervals, and the welding section is provided with a welding plane and a welding side surface. When the heat pipe is accommodated in the heat pipe groove, the welding plane is flush with the bottom of the heat pipe groove, and first solder is provided on both sides of the heat pipe groove, and the welding side surfaces are closely fitted with the first solder to realize seamless welding of the heat pipe and the heat pipe groove.

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