A kind of inflation type phase change temperature balancing plate and manufacturing process

Abstract

The present invention relates to the technical field of temperature-averaging plate manufacturing, specifically to an inflatable phase-change temperature-averaging plate and manufacturing process, including: printing graphite pipelines on the rough surface of an alloy plate, stacking and riveting oppositely, and sending them into a heating furnace for heating to form a composite plate; clamping the leveled composite plate in a mold for inflating to obtain a plate shell; vacuuming the plate shell, then injecting a phase-change material into the cavity, and sealing the plate shell by welding to obtain an inflatable phase-change temperature-averaging plate. The present invention adds Sr and B to the Al‑Ni‑Si‑Fe alloy for treatment, and the synergistic effect of the two can significantly improve the alloy structure. In the later stage, nitriding is performed on the inner and outer surfaces of the plate shell alloy, and finally the thermal conductivity, strength, hardness and corrosion resistance of the plate shell alloy are improved.

Description

Technical Field

[0001] The invention relates to the technical field of temperature equalizing plate manufacturing, and in particular to an inflation-type phase-change temperature equalizing plate and a manufacturing process thereof. Background Art

[0002] Phase change heat spreader is a highly efficient heat dissipation device, usually composed of a shell and a phase change liquid filled in the shell. Currently, most shells are made of pure aluminum or aluminum alloy. Although pure aluminum has good thermal conductivity, its strength is biased; although aluminum alloy has good strength, its thermal conductivity is average, which limits the application of the heat spreader. Based on this, an inflation-type phase change heat spreader and a manufacturing process are proposed. Summary of the invention

[0003] In order to address the deficiencies of the prior art, the present invention provides an inflation-type phase-change temperature-averaging plate and a manufacturing process, which improves the overall quality of the plate shell by adding Sr and B and coordinating ultrasonic treatment in the early stage and uniformly nitriding the inner and outer surfaces in the later stage.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an inflation-type phase-change temperature-averaging plate, comprising a plate shell and a phase-change material injected into a cavity of the plate shell;

[0005] The plate shell raw material includes the following components in percentage by mass: Si (silicon) 5-10%, Ni (nickel) 1-3%, Fe (iron) 0.5-0.8%, Sr-B (strontium-boron) 0.1-0.3%, and the balance is Al (aluminum) and inevitable impurities.

[0006] Preferably, the Sr-B is the total amount of Sr and B, wherein the mass ratio of Sr to B is 1:2.

[0007] Preferably, the plate shell is made of an alloy plate, and the alloy plate is prepared as follows: raw materials are put into a smelting furnace in proportion, and after being completely melted, they are allowed to stand and keep warm, and then refined and slag removed to obtain a melt; the melt is ultrasonically treated, and then poured into a preheated mold, and after cooling, demolding, and rolling, an alloy plate is obtained.

[0008] Preferably, the mixture is kept at 750-800°C for 2-3 hours; the refining time is controlled to be 10-20 minutes; and the preheating temperature of the mold is controlled to be 200-250°C.

[0009] Preferably, the ultrasonic treatment process is as follows: the ultrasonic power is 800-1200W, and the ultrasonic time is 80-100s.

[0010] Preferably, the phase change material is deoxygenated water or paraffin oil.

[0011] Preferably, the deoxygenated water is prepared as follows: raw water is boiled, cooled, injected into a tank for vacuuming, and maintained at 5 KPa for 10 minutes to obtain deoxygenated water.

[0012] The present invention also provides a manufacturing process of a blown phase change temperature balancing plate, comprising the following steps:

[0013] (1) Take two alloy plates and roughen their surfaces;

[0014] (2) Printing graphite pipelines on the rough surface of the alloy plate, stacking the rough surfaces of two alloy plates facing each other and riveting them together, reserving two sets of channel openings at the opposite ends of the two alloy plates, sending them into a heating furnace for heating to form a composite plate, and rolling and leveling the composite plate;

[0015] (3) The leveled composite plate is clamped in a mold and inflated simultaneously through two sets of channel openings using high-pressure nitrogen to form a cavity to obtain a plate shell;

[0016] (4) sending the plate and shell into a plasma nitriding furnace for nitriding treatment to obtain a strengthened plate and shell;

[0017] (5) Welding and sealing one set of channel openings of the reinforced plate shell, and performing vacuum treatment, and then injecting phase change material into the cavity;

[0018] (6) Another set of channel openings of the reinforced plate shell are welded and sealed, and after fine finishing, an inflatable phase change temperature-averaging plate is obtained.

[0019] Preferably, in step (4), the nitriding treatment temperature is controlled to be 460° C., the nitriding treatment time is controlled to be 2 h, the nitrogen flow rate is controlled to be 0.1 L / min, and the hydrogen flow rate is controlled to be 0.2 L / min.

[0020] The present invention provides an inflation-type phase-change temperature-averaging plate and a manufacturing process, which have the following beneficial effects compared with the prior art:

[0021] The present invention adds Sr and B to the Al-Ni-Si-Fe alloy for treatment, and the synergistic effect of the two can significantly improve the alloy structure. Later, nitriding is performed on the inner and outer surfaces of the plate and shell alloy, and finally the thermal conductivity, strength, hardness and corrosion resistance of the plate and shell alloy are improved; specifically, the added Sr hinders the growth of Si, and can transform the coarse lath-like eutectic Si into fine short flakes and coral-like structures, thereby improving the continuity of the Al matrix and improving the thermal conductivity of the alloy; the addition of B can improve the strength of the alloy, optimize the ratio of Sr and B, and can well balance the thermal conductivity and strength of the plate and shell; the nitriding treatment is to uniformly embed nitrides on the inner and outer surfaces of the plate and shell, thereby improving the strength and corrosion resistance of the surface.

[0022] The present invention performs ultrasonic treatment on the melt, and the α-Al morphology is transformed from dendrites to equiaxed crystals, so that the primary α-Al grains are significantly refined, and the ultrasonic treatment also refines and better disperses the eutectic particles, further improving the thermal conductivity and strength of the plate shell.

[0023] The present invention improves the manufacturing process of the phase change temperature equalizing plate. During the nitriding treatment, the gas flows smoothly in the plate shell, which is beneficial to the uniform nitriding of the inner surface of the plate shell, thereby improving the quality of the inner surface of the plate shell and reducing the corrosion rate of the phase change material on the inner surface of the plate shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 This is a graph showing the relationship between the Sr-B ratio, thermal conductivity and tensile strength in the present invention. DETAILED DESCRIPTION

[0026] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0027] Example 1

[0028] Preparation of deoxygenated water: After boiling and cooling, the raw water is injected into the tank for vacuuming and maintained at 5KPa for 10 minutes to obtain deoxygenated water with an oxygen content below 0.2ppm, which can reduce oxidative corrosion to the plates and shells.

[0029] Example 2

[0030] A blown phase change temperature plate comprises a plate shell and a phase change material (deoxygenated water in Example 1) injected into the plate shell cavity; the plate shell raw material comprises the following components by mass percentage: Si 10%, Ni 1%, Fe 0.8%, Sr-B 0.1%, and the balance is Al and unavoidable impurities. Sr-B is the total amount of Sr and B, wherein the mass ratio of Sr to B is 1:2.

[0031] The plate shell is made of alloy plate, and the alloy plate is prepared as follows: the raw materials are put into a melting furnace in proportion, and after being completely melted, they are kept at 800°C for 2 hours, and then refined for 20 minutes and slag removed to obtain a melt; the melt is ultrasonically treated at a power of 800 W for 100 seconds, and then poured into a mold preheated to 200°C, and after cooling, demolding, and rolling, an alloy plate is obtained.

[0032] A manufacturing process of a blown phase change temperature equalizing plate comprises the following steps:

[0033] (1) Take two alloy plates and roughen their surfaces;

[0034] (2) Printing graphite pipelines on the rough surface of the alloy plate, stacking the rough surfaces of two alloy plates facing each other and riveting them together, reserving two sets of channel openings at the opposite ends of the two alloy plates, sending them into a heating furnace for heating to form a composite plate, and rolling and leveling the composite plate;

[0035] (3) The leveled composite plate is clamped in a mold and inflated simultaneously through two sets of channel openings using high-pressure nitrogen to form a cavity to obtain a plate shell;

[0036] (4) Sending the plate and shell into a plasma nitriding furnace for nitriding treatment to obtain a strengthened plate and shell; controlling the nitriding treatment temperature to 460°C, the nitriding treatment time to 2h, the nitrogen flow rate to 0.1L / min, and the hydrogen flow rate to 0.2L / min;

[0037] (5) Welding and sealing one set of channel openings of the reinforced plate shell, and performing vacuum treatment, and then injecting phase change material into the cavity;

[0038] (6) Another set of channel openings of the reinforced plate shell are welded and sealed, and after fine finishing, an inflatable phase change temperature-averaging plate is obtained.

[0039] Example 3

[0040] A blown phase change temperature plate includes a plate shell and a phase change material (paraffin oil) injected into the plate shell cavity; the plate shell raw material includes the following components by mass percentage: Si 5%, Ni 3%, Fe 0.5%, Sr-B 0.3%, and the balance is Al and unavoidable impurities. Sr-B is the total amount of Sr and B, wherein the mass ratio of Sr to B is 1:2.

[0041] The plate shell is made of alloy plate, and the alloy plate is prepared as follows: the raw materials are put into a smelting furnace in proportion, and after being completely melted, they are kept at 750°C for 3 hours, and then refined for 10 minutes and slag removed to obtain a melt; the melt is ultrasonically treated at a power of 1200 W for 80 seconds, and then poured into a mold preheated to 250°C, and after cooling, demolding and rolling, an alloy plate is obtained.

[0042] A manufacturing process of a blown phase change temperature equalizing plate comprises the following steps:

[0043] (1) Take two alloy plates and roughen their surfaces;

[0044] (2) Printing graphite pipelines on the rough surface of the alloy plate, stacking the rough surfaces of two alloy plates facing each other and riveting them together, reserving two sets of channel openings at the opposite ends of the two alloy plates, sending them into a heating furnace for heating to form a composite plate, and rolling and leveling the composite plate;

[0045] (3) The leveled composite plate is clamped in a mold and inflated simultaneously through two sets of channel openings using high-pressure nitrogen to form a cavity to obtain a plate shell;

[0046] (4) Sending the plate and shell into a plasma nitriding furnace for nitriding treatment to obtain a strengthened plate and shell; controlling the nitriding treatment temperature to 460°C, the nitriding treatment time to 2h, the nitrogen flow rate to 0.1L / min, and the hydrogen flow rate to 0.2L / min;

[0047] (5) Welding and sealing one set of channel openings of the reinforced plate shell, and performing vacuum treatment, and then injecting phase change material into the cavity;

[0048] (6) Another set of channel openings of the reinforced plate shell are welded and sealed, and after fine finishing, an inflatable phase change temperature-averaging plate is obtained.

[0049] Example 4

[0050] A blown phase change temperature equalizing plate comprises a plate shell and a phase change material (deoxygenated water in Example 1) injected into the plate shell cavity; the plate shell raw material comprises the following components by mass percentage: Si 7%, Ni 1.5%, Fe 0.6%, Sr-B 0.2%, and the balance is Al and unavoidable impurities. Sr-B is the total amount of Sr and B, wherein the mass ratio of Sr to B is 1:2.

[0051] The plate shell is made of alloy plate, and the alloy plate is prepared as follows: the raw materials are put into a melting furnace in proportion, and after being completely melted, they are kept at 770°C for 2.5 hours, and then refined for 15 minutes and slag removed to obtain a melt; the melt is ultrasonically treated at a power of 1000 W for 90 seconds, and then poured into a mold preheated to 230°C, and after cooling, demolding and rolling, an alloy plate is obtained.

[0052] A manufacturing process of a blown phase change temperature equalizing plate comprises the following steps:

[0053] (1) Take two alloy plates and roughen their surfaces;

[0054] (2) Printing graphite pipelines on the rough surface of the alloy plate, stacking the rough surfaces of two alloy plates facing each other and riveting them together, reserving two sets of channel openings at the opposite ends of the two alloy plates, sending them into a heating furnace for heating to form a composite plate, and rolling and leveling the composite plate;

[0055] (3) The leveled composite plate is clamped in a mold and inflated simultaneously through two sets of channel openings using high-pressure nitrogen to form a cavity to obtain a plate shell;

[0056] (4) Sending the plate and shell into a plasma nitriding furnace for nitriding treatment to obtain a strengthened plate and shell; controlling the nitriding treatment temperature to 460°C, the nitriding treatment time to 2h, the nitrogen flow rate to 0.1L / min, and the hydrogen flow rate to 0.2L / min;

[0057] (5) Welding and sealing one set of channel openings of the reinforced plate shell, and performing vacuum treatment, and then injecting phase change material into the cavity;

[0058] (6) Another set of channel openings of the reinforced plate shell are welded and sealed, and after fine finishing, an inflatable phase change temperature-averaging plate is obtained.

[0059] Comparative Example 1

[0060] A blown phase change temperature equalizing plate comprises a plate shell and a phase change material (deoxygenated water in Example 1) injected into a cavity of the plate shell; the plate shell raw material comprises the following components in percentage by mass: Si 7%, Ni 1.5%, Fe 0.6%, and the remainder is Al and unavoidable impurities.

[0061] The plate shell is made of alloy plate, and the alloy plate is prepared as follows: the raw materials are put into a melting furnace in proportion, and after being completely melted, they are kept at 770°C for 2.5 hours, and then refined for 15 minutes and slag removed to obtain a melt; the melt is ultrasonically treated at a power of 1000 W for 90 seconds, and then poured into a mold preheated to 230°C, and after cooling, demolding and rolling, an alloy plate is obtained.

[0062] The manufacturing process of the inflation-type phase-change temperature-averaging plate in this comparative example is the same as that of Example 4.

[0063] Comparative Example 2

[0064] A blown phase change temperature equalizing plate comprises a plate shell and a phase change material (deoxygenated water in Example 1) injected into a plate shell cavity; the plate shell raw material comprises the following components in percentage by mass: Si 7%, Ni 1.5%, Fe 0.6%, B 0.2%, and the remainder is Al and unavoidable impurities.

[0065] The plate shell is made of alloy plate, and the alloy plate is prepared as follows: the raw materials are put into a melting furnace in proportion, and after being completely melted, they are kept at 770°C for 2.5 hours, and then refined for 15 minutes and slag removed to obtain a melt; the melt is ultrasonically treated at a power of 1000 W for 90 seconds, and then poured into a mold preheated to 230°C, and after cooling, demolding and rolling, an alloy plate is obtained.

[0066] The manufacturing process of the inflation-type phase-change temperature-averaging plate in this comparative example is the same as that of Example 4.

[0067] Comparative Example 3

[0068] A blown phase change temperature equalizing plate comprises a plate shell and a phase change material (deoxygenated water in Example 1) injected into a plate shell cavity; the plate shell raw material comprises the following components in percentage by mass: Si 7%, Ni 1.5%, Fe 0.6%, B 0.2%, and the remainder is Al and unavoidable impurities.

[0069] The plate shell is made of alloy plate, and the alloy plate is prepared as follows: the raw materials are put into a melting furnace in proportion, and after being completely melted, they are kept at 770°C for 2.5 hours, and then refined for 15 minutes and slag removed to obtain a melt; the melt is ultrasonically treated at a power of 1000 W for 90 seconds, and then poured into a mold preheated to 230°C, and after cooling, demolding and rolling, an alloy plate is obtained.

[0070] The manufacturing process of the inflation-type phase-change temperature-averaging plate in this comparative example is the same as that of Example 4.

[0071] Comparative Example 4

[0072] A blown phase change temperature equalizing plate comprises a plate shell and a phase change material (deoxygenated water in Example 1) injected into the plate shell cavity; the plate shell raw material comprises the following components by mass percentage: Si 7%, Ni 1.5%, Fe 0.6%, Sr-B 0.2%, and the balance is Al and unavoidable impurities. Sr-B is the total amount of Sr and B, wherein the mass ratio of Sr to B is 1:2.

[0073] The plate shell is made of alloy plate, and the alloy plate is prepared as follows: the raw materials are put into a smelting furnace in proportion, and after being completely melted, they are kept at 770°C for 2.5 hours, and then refined for 15 minutes and slag removed to obtain a molten liquid; then poured into a mold preheated to 230°C, and after cooling, demolding and rolling, an alloy plate is obtained.

[0074] The manufacturing process of the inflation-type phase-change temperature-averaging plate in this comparative example is the same as that of Example 4.

[0075] Comparative Example 5

[0076] A blown phase change temperature equalizing plate comprises a plate shell and a phase change material (deoxygenated water in Example 1) injected into the plate shell cavity; the plate shell raw material comprises the following components by mass percentage: Si 7%, Ni 1.5%, Fe 0.6%, Sr-B 0.2%, and the balance is Al and unavoidable impurities. Sr-B is the total amount of Sr and B, wherein the mass ratio of Sr to B is 1:2.

[0077] The plate shell is made of alloy plate, and the alloy plate is prepared as follows: the raw materials are put into a melting furnace in proportion, and after being completely melted, they are kept at 770°C for 2.5 hours, and then refined for 15 minutes and slag removed to obtain a melt; the melt is ultrasonically treated at a power of 1000 W for 90 seconds, and then poured into a mold preheated to 230°C, and after cooling, demolding and rolling, an alloy plate is obtained.

[0078] A manufacturing process of a blown phase change temperature equalizing plate comprises the following steps:

[0079] (1) Take two alloy plates and roughen their surfaces;

[0080] (2) Printing a graphite pipeline on the rough surface of the alloy plate, stacking the rough surfaces of two alloy plates facing each other and riveting them together, leaving a channel opening at one end of the two alloy plates, sending them into a heating furnace for heating to form a composite plate, and rolling and leveling the composite plate;

[0081] (3) Clamp the leveled composite board in the mold, and use high-pressure nitrogen to blow it through the channel to form a cavity to obtain a board shell;

[0082] (4) Sending the plate and shell into a plasma nitriding furnace for nitriding treatment to obtain a strengthened plate and shell; controlling the nitriding treatment temperature to 460°C, the nitriding treatment time to 2h, the nitrogen flow rate to 0.1L / min, and the hydrogen flow rate to 0.2L / min;

[0083] (5) Vacuuming the reinforced shell and then injecting phase change material into the cavity;

[0084] (6) The channel opening of the reinforced plate shell is welded and sealed, and after fine finishing, an inflatable phase change temperature-averaging plate is obtained.

[0085] Quality Inspection

[0086] The reinforced plates and shells in Examples 2-4 and Comparative Examples 1-4 were used as samples to test thermal conductivity and tensile strength.

[0087] 1. Thermal conductivity test

[0088] The flash method is used for testing. By measuring the thermal diffusivity, specific heat and density of the sample, the thermal conductivity of the alloy is calculated. The formula is:

[0089] In the formula, is thermal conductivity, W / (m·K); is the thermal diffusion coefficient, mm 2 / s; is the specific heat, J / (g·K); is the density, g / cm 3 .

[0090] Among them, the specific heat is tested according to ASTME1461-13 standard; the thermal diffusion coefficient is tested according to ASTME1269-11 standard; the density test adopts Archimedes drainage method and is tested according to GB / T 1423-1996 standard.

[0091] 2. Tensile strength test

[0092] The test was carried out using a universal testing machine in accordance with GB / T 228.1 standard. The specific test results are shown in the following table.

[0093] Table 1 Thermal conductivity and tensile strength

[0094]

[0095] It can be seen from the above table that the samples in Examples 2-4 have a good balance between thermal conductivity and tensile strength and have excellent performance; by comparing the samples in Examples 1-3 and Example 4, it is shown that compared with the use of Sr / B alone, the combined use of Sr-B can better improve the quality of the plate and shell; by comparing the samples in Example 4 and Example 4, it can be seen that ultrasonic treatment can improve the thermal conductivity and tensile strength of the plate and shell.

[0096] 3. Hardness and corrosion resistance

[0097] Take the reinforced plate shells in Example 4 and Comparative Example 5, cut them, and use the outer surface as the front side and the inner surface as the back side.

[0098] According to the standard of GB / T 231.1, the hardness of the front and back of the cut reinforced plate shell was tested by using a Brinell hardness tester. A mixed solution of 3.5wt% NaCl + 1.0wt% HCl was taken, and the front and back of the reinforced plate shell were respectively suspended and immersed in the mixed solution for corrosion resistance testing. The specific test results are shown in the following table.

[0099] Table 2 Hardness and corrosion resistance

[0100]

[0101] It can be seen from the above table that the performance of the front side of comparative example 5 is close to that of embodiment 4, but the performance of the back side is significantly reduced, which shows that reserving two sets of channel openings is conducive to the circulation of gas in the plate shell, so that nitrogen ions can evenly penetrate into the outer and inner surfaces of the plate shell; while a single set of channel openings is not convenient for gas circulation during nitriding, which will eventually affect the quality of the inner surface of the plate shell.

[0102] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A blowing phase change temperature equalizing plate, characterized in that: It includes a plate shell and a phase change material injected into a cavity of the plate shell; The plate and shell raw material comprises the following components in percentage by mass: Si 5-10%, Ni 1-3%, Fe 0.5-0.8%, Sr-B 0.1-0.3%, and the balance is Al and unavoidable impurities; The manufacturing process of the inflation-type phase-change temperature-averaging plate comprises the following steps: (1) Take two alloy plates and roughen their surfaces; (2) Printing graphite pipelines on the rough surface of the alloy plate, stacking the rough surfaces of two alloy plates facing each other and riveting them together, reserving two sets of channel openings at the opposite ends of the two alloy plates, sending them into a heating furnace for heating to form a composite plate, and rolling and leveling the composite plate; (3) The leveled composite plate is clamped in a mold and inflated simultaneously through two sets of channel openings using high-pressure nitrogen to form a cavity to obtain a plate shell; (4) sending the plate and shell into a plasma nitriding furnace for nitriding treatment to obtain a strengthened plate and shell; (5) Welding and sealing one set of channel openings of the reinforced plate shell, and performing vacuum treatment, and then injecting phase change material into the cavity; (6) Another set of channel openings of the reinforced plate shell are welded and sealed, and after fine finishing, an inflatable phase change temperature-averaging plate is obtained.

2. The inflation type phase change temperature equalizing plate according to claim 1, characterized in that: The Sr-B is the total amount of Sr and B, wherein the mass ratio of Sr to B is 1:

2.

3. The inflation type phase change temperature equalizing plate according to claim 1, characterized in that: The plate shell is made of an alloy plate, and the alloy plate is prepared as follows: raw materials are put into a smelting furnace in proportion, and after being completely melted, they are allowed to stand and keep warm, and then refined and deslagging are performed to obtain a molten liquid; the molten liquid is ultrasonically treated, and then poured into a preheated mold, and after cooling, demolding, and rolling, an alloy plate is obtained.

4. The inflation type phase change temperature balancing plate according to claim 3, characterized in that: Keep it at 750-800℃ for 2-3h; control the refining time to 10-20min; control the preheating temperature of the mold to 200-250℃.

5. The inflation-type phase-change temperature-averaging plate according to claim 3, characterized in that: The ultrasonic treatment process is as follows: the ultrasonic power is 800-1200W, and the ultrasonic time is 80-100s.

6. The inflation type phase change temperature balancing plate according to claim 1, characterized in that: The phase change material is deoxygenated water or paraffin oil.

7. The inflation-type phase-change temperature-averaging plate according to claim 6, characterized in that: The deoxygenated water is prepared as follows: raw water is boiled, cooled, and then injected into a tank for vacuuming, and maintained at 5 KPa for 10 minutes to obtain deoxygenated water.

8. The inflation-type phase-change temperature-averaging plate according to claim 1, characterized in that: In step (4), the nitriding treatment temperature is controlled to be 460° C., the nitriding treatment time is controlled to be 2 h, the nitrogen flow rate is controlled to be 0.1 L / min, and the hydrogen flow rate is controlled to be 0.2 L / min.

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