Manufacturing process of tailless packaging heat pipe and tailless packaging heat pipe manufactured by manufacturing process

Abstract

The invention discloses a tailless packaging heat pipe manufacturing process and a tailless packaging heat pipe manufactured by the tailless packaging heat pipe manufacturing process, and relates to the technical field of heat exchange equipment. 2, preparing an anti-wetting coating in a gradient manner; thirdly, the air suction units are assembled; step 4, carrying out tailless laser sealing; 5, precisely filling the working medium; sixthly, gradient hot-pressing end socket sealing is conducted; according to the method, in the first step, the template is prefabricated through laser processing, micropores are formed in the template, chemical etching is replaced with a laser template method, the aperture deviation is optimized from + / -50 microns to + / -1 microns, and the micropore structure control accuracy is improved; in the second step, the anti-wetting coating is prepared in a gradient mode, the anti-wetting coating is prepared through a magnetron sputtering deposition method, the material of the composite layer is Pt-Al2O3, and the cost of the composite layer is reduced; in the sixth step, the sealing heads are sealed at the two ends of the heat pipe fitting through the first-stage sealing and the second-stage sealing, the sealing efficiency is improved, and the energy consumption is reduced.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, specifically to a tailless encapsulated heat pipe manufacturing process and the tailless encapsulated heat pipe manufactured therefrom. Background Technology

[0002] A heat pipe is a heat transfer element. It makes full use of the principles of heat conduction and the rapid heat transfer properties of phase change media to quickly transfer heat from a heated object to the outside of the heat source. Its thermal conductivity exceeds that of any known metal.

[0003] According to CN119245401B - Manufacturing process of tailless encapsulated heat pipe and the tailless encapsulated heat pipe manufactured therefrom, hereinafter collectively referred to as the reference patent, the reference patent describes the manufacturing process of tailless encapsulated heat pipe, but it has the following problems: 1. Manufacturing complexity and cost: The manufacturing process adopts an ultra-long 12-step process, which increases the manufacturing complexity and material cost. At the same time, the use of platinum coating, zirconium aluminum getter, and custom alloy end caps significantly increases the raw material cost; 2. Poor micropore consistency: The pore size distribution (0.1-500μm) of alkaline pore formation in step S3 has a large range, which can easily lead to uneven air permeability in some areas; 3. Interface bonding risk: The transition interface in step S4 needs to be precisely controlled with a thickness of 50-500nm. If it is too thin, the wetting protection will fail, and if it is too thick, the air permeability will be reduced.

[0004] In summary, a tailless encapsulated heat pipe manufacturing process and the tailless encapsulated heat pipe manufactured therefrom were designed. Summary of the Invention

[0005] In order to overcome the above-mentioned shortcomings, the present invention provides a tailless encapsulated heat pipe manufacturing process and a tailless encapsulated heat pipe manufactured therefrom.

[0006] The present invention achieves the above objectives through the following technical solutions:

[0007] A tailless encapsulated heat pipe manufacturing process includes the following steps:

[0008] Step 1: Prefabrication of composite isolation mesh. A prefabricated template is made by laser processing. Micropores are opened on the template. A mixture of alumina, zirconium oxide and nickel metal powder is placed in the prefabricated template. Under vacuum or inert gas protection, the mixture is sintered to form a composite isolation mesh. A metal-ceramic substrate with a precise microporous structure is constructed to achieve selective control of gas permeation.

[0009] Step 2: Gradient preparation of anti-wetting coating. The anti-wetting coating is prepared by magnetron sputtering deposition. The anti-wetting coating consists of a titanium metal transition layer, a zirconium oxide barrier layer and a Pt-Al2O3 composite layer. The composite coating prevents alkali metal penetration and reduces costs. The cost of the composite layer is reduced by 60%, and the H2 barrier rate is reduced by only 0.5%.

[0010] Step 3: Assemble the getter unit. Laser weld the composite isolation mesh to the inner wall of the heat pipe fitting 10-100mm from one end. The composite isolation mesh and one end of the heat pipe fitting form a getter chamber, and the composite isolation mesh and the other end of the heat pipe fitting form a working chamber. Place the getter in the getter chamber.

[0011] Step 4: Tailless laser sealing. First and second end caps are prepared at both ends of the heat pipe fitting. The first end cap is located in the suction chamber and the second end cap is located in the working chamber, thereby achieving a structural seal with no residual tail pipe.

[0012] Step 5: Precision filling of the working medium. Alkali metal is injected through the microchannels on the side wall of the heat pipe fitting. Argon gas protection is used throughout the filling process to precisely control the amount of alkali metal injected and ensure the performance of the heat pipe.

[0013] Step 6: Gradient hot-pressing head sealing, the head is sealed at both ends of the heat pipe fitting through two stages of primary sealing and secondary sealing, followed by interface strengthening;

[0014] Step 7: Heating thermal cycling verification, used for rapid reliability assessment simulating a 10-year lifespan.

[0015] Preferably, in step one, the mixture contains 60% alumina, 30% zirconium oxide, and 10% nickel metal powder. Alumina provides chemical stability, zirconium oxide enhances mechanical strength, and nickel metal improves thermal conductivity. The pre-formed template has a micropore diameter of 5±1μm and a porosity of 35%-40%. The sintering temperature is 1100-1150℃, the sintering time is 1-1.2 hours, and the vacuum degree is ≤10. -3 Pa prevents oxidation and ensures that the nickel metal powder is evenly dispersed to form a metal-ceramic network.

[0016] Preferably, in step two, the titanium metal transition layer has a thickness of 200 nm to improve the adhesion between the coating and the substrate, the zirconium oxide barrier layer has a thickness of 1 μm to block the diffusion of alkali metal ions, Pt nanoparticles (particle size 20-50 nm) are embedded in the Al2O3 matrix in the Pt-Al2O3 composite layer, the thickness of the Pt-Al2O3 composite layer is 0.5 μm, and the deposition temperature of magnetron sputtering is 450 °C, which can balance crystal growth and substrate thermal stability.

[0017] Preferably, in step three, the getter is a zirconium aluminum 16 type getter, and the getter loading is 50 mg / cm³. 3 .

[0018] Preferably, in step four, the weld penetration depth of the first and second end caps and the heat pipe fitting is 0.8-1.2 mm and the width is 0.3 mm. Before the second end cap is prepared, the alkali metal reflux mesh is fixedly set in the working chamber.

[0019] Preferably, in step five, the alkali metal is a sodium-potassium alloy with a purity ≥99.95%, an oxygen content ≤50ppm, and the amount of alkali metal filled is 22%-25% of the heat pipe fitting volume.

[0020] Preferably, in step six, the working temperature of the first sealing is 300℃, the sealing pressure is 5MPa, and the duration is 5 minutes to initially form a metallurgical bond; the working temperature of the second sealing is 150℃, the sealing pressure is 10MPa, and the duration is 2 minutes to eliminate residual stress; the materials of the first and second end caps are 316L stainless steel, and the interface-strengthened bonding strength is ≥250MPa.

[0021] Preferably, in step seven, the test cycle conditions are as follows: temperature range -40℃ to 200℃, temperature rise / fall rate 30℃ / min, and the monitoring indicators are as follows: leakage rate change: ≤5×10 after 500 cycles. -10 Pa·m 3 / s, thermal resistance fluctuation: ΔR<0.05℃ / W.

[0022] A tailless encapsulated heat pipe manufactured by the tailless encapsulation heat pipe manufacturing process described above includes a heat pipe fitting. The heat pipe fitting has a first end cap and a second end cap at both ends. The heat pipe fitting has a composite isolation mesh at both ends inside. The composite isolation mesh and the first end cap form an air intake chamber. The composite isolation mesh and the second end cap form a working chamber. An alkali metal reflux mesh is provided inside the working chamber.

[0023] Preferably, the first and second end caps are provided with a gas barrier coating, and a leak-proof layer is provided outside the gas barrier coating.

[0024] The beneficial effects of this invention are: the manufacturing process of the tailless encapsulated heat pipe and the tailless encapsulated heat pipe manufactured therefrom:

[0025] 1. In step one, a laser-processed prefabricated template is used to create microholes on the template. The laser template method replaces chemical etching, and the aperture deviation is optimized from ±50μm to ±1μm, which improves the accuracy of microhole structure control.

[0026] 2. In step two, an anti-wetting coating is prepared by gradient deposition using magnetron sputtering. The composite layer is made of Pt-Al2O3, which reduces the cost of the composite layer while still meeting the protection requirements against H2.

[0027] 3. In step six, the end caps are sealed at both ends of the heat pipe fitting through two stages: primary sealing and secondary sealing, which improves sealing efficiency and reduces energy consumption. Attached Figure Description

[0028] The present invention will be described by way of example and with reference to the accompanying drawings, wherein:

[0029] Figure 1 This is a flowchart of the manufacturing process of the present invention. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0031] like Figure 1 As shown, a tailless encapsulated heat pipe manufacturing process includes the following steps:

[0032] Step 1: Prefabrication of composite isolation mesh. A prefabricated template is made by laser processing. Micropores are opened on the template. A mixture of alumina, zirconium oxide and nickel metal powder is placed in the prefabricated template. Under vacuum or inert gas protection, the mixture is sintered to form a composite isolation mesh. A metal-ceramic substrate with a precise microporous structure is constructed to achieve selective control of gas permeation.

[0033] Step 2: Gradient preparation of anti-wetting coating. The anti-wetting coating is prepared by magnetron sputtering deposition. The anti-wetting coating consists of a titanium metal transition layer, a zirconium oxide barrier layer and a Pt-Al2O3 composite layer. The composite coating prevents alkali metal penetration and reduces costs. The cost of the composite layer is reduced by 60%, and the H2 barrier rate is reduced by only 0.5%.

[0034] Step 3: Assemble the getter unit. Laser weld the composite isolation mesh to the inner wall of the heat pipe fitting 10-100mm from one end. The composite isolation mesh and one end of the heat pipe fitting form a getter chamber, and the composite isolation mesh and the other end of the heat pipe fitting form a working chamber. Place the getter in the getter chamber.

[0035] Step 4: Tailless laser sealing. First and second end caps are prepared at both ends of the heat pipe fitting. The first end cap is located in the suction chamber and the second end cap is located in the working chamber, thereby achieving a structural seal with no residual tail pipe.

[0036] Step 5: Precision filling of the working medium. Alkali metal is injected through the microchannels on the side wall of the heat pipe fitting. Argon gas protection is used throughout the filling process to precisely control the amount of alkali metal injected and ensure the performance of the heat pipe.

[0037] Step 6: Gradient hot-pressing head sealing, the head is sealed at both ends of the heat pipe fitting through two stages of primary sealing and secondary sealing, followed by interface strengthening;

[0038] Step 7: Heating thermal cycling verification, used for rapid reliability assessment simulating a 10-year lifespan.

[0039] Specifically, in step one, the mixture contains 60% alumina, 30% zirconium oxide, and 10% nickel metal powder. Alumina provides chemical stability, zirconium oxide enhances mechanical strength, and nickel metal improves thermal conductivity. The pre-made template has a micropore diameter of 5±1μm and a porosity of 35%-40%. The sintering temperature is 1100-1150℃, the sintering time is 1-1.2 hours, and the vacuum degree is ≤10. -3 Pa prevents oxidation and ensures that the nickel metal powder is evenly dispersed to form a metal-ceramic network.

[0040] Specifically, in step two, the titanium metal transition layer has a thickness of 200 nm to improve the adhesion between the coating and the substrate, the zirconium oxide barrier layer has a thickness of 1 μm to block the diffusion of alkali metal ions, Pt nanoparticles (particle size 20-50 nm) are embedded in the Al2O3 matrix in the Pt-Al2O3 composite layer, the thickness of the Pt-Al2O3 composite layer is 0.5 μm, and the deposition temperature of magnetron sputtering is 450℃, which can balance crystal growth and substrate thermal stability.

[0041] Specifically, in step three, the getter is a zirconium aluminum 16 type getter, and the getter loading is 50 mg / cm³. 3 .

[0042] Specifically, in step four, the weld penetration depth of the first and second end caps and the heat pipe fitting is 0.8-1.2 mm, and the width is 0.3 mm. Before the second end cap is prepared, the alkali metal reflux mesh is fixedly set in the working chamber.

[0043] Specifically, in step five, the alkali metal is a sodium-potassium alloy with a purity ≥99.95% and an oxygen content ≤50ppm. The amount of alkali metal filled is 22%-25% of the volume of the heat pipe fitting.

[0044] Specifically, in step six, the working temperature of the first sealing is 300℃, the sealing pressure is 5MPa, and the duration is 5 minutes, initially forming a metallurgical bond. The working temperature of the second sealing is 150℃, the sealing pressure is 10MPa, and the duration is 2 minutes, eliminating residual stress. The materials of the first and second end caps are 316L stainless steel, and the interface-strengthened bonding strength is ≥250MPa.

[0045] Specifically, in step seven, the test cycle conditions are as follows: temperature range -40℃ to 200℃, temperature rise / fall rate 30℃ / min, and the monitoring indicators are as follows: leakage rate change: ≤5×10 after 500 cycles. -10 Pa·m 3 / s, thermal resistance fluctuation: ΔR<0.05℃ / W.

[0046] A tailless encapsulated heat pipe manufactured by the tailless encapsulation heat pipe manufacturing process described above includes a heat pipe fitting. The heat pipe fitting has a first end cap and a second end cap at both ends. The heat pipe fitting has a composite isolation mesh at both ends inside. The composite isolation mesh and the first end cap form an air intake chamber. The composite isolation mesh and the second end cap form a working chamber. An alkali metal reflux mesh is provided inside the working chamber.

[0047] Specifically, the first and second end caps are provided with a gas barrier coating, and a leak-proof layer is provided outside the gas barrier coating.

[0048] Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this invention. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A manufacturing process for a tailless encapsulated heat pipe, characterized in that: Includes the following steps: Step 1: Prefabrication of composite isolation net. A prefabricated template is made by laser processing. Microholes are opened on the template. A mixture of alumina, zirconium oxide and nickel metal powder is placed in the prefabricated template. The mixture is sintered under vacuum or inert gas protection to form a composite isolation net. Step 2: Gradient preparation of anti-wetting coating. The anti-wetting coating is prepared by magnetron sputtering deposition. The anti-wetting coating consists of a titanium metal transition layer, a zirconium oxide barrier layer and a Pt-Al2O3 composite layer. Step 3: Assemble the getter unit. Laser weld the composite isolation mesh to the inner wall of the heat pipe fitting 10-100mm from one end. The composite isolation mesh and one end of the heat pipe fitting form a getter chamber, and the composite isolation mesh and the other end of the heat pipe fitting form a working chamber. Place the getter in the getter chamber. Step 4: Tailless laser sealing. First and second end caps are prepared at both ends of the heat pipe fitting. The first end cap is located in the suction chamber, and the second end cap is located in the working chamber. Step 5: Precision filling of the working medium. Alkali metal is injected through the microchannels on the side wall of the heat pipe fitting, and argon gas protection is used throughout the filling process. Step 6: Gradient hot-pressing head sealing, the head is sealed at both ends of the heat pipe fitting through two stages of primary sealing and secondary sealing, followed by interface strengthening; Step 7: Heating and thermal cycle verification.

2. The manufacturing process of a tailless encapsulated heat pipe according to claim 1, characterized in that: In step one, the mixture contains 60% alumina, 30% zirconium oxide, and 10% nickel metal powder by mass. The pre-made template has a micropore diameter of 5±1 μm and a porosity of 35%-40%. The sintering temperature is 1100-1150℃, the sintering time is 1-1.2 hours, and the vacuum degree is ≤10. -3 Pa.

3. The manufacturing process of a tailless encapsulated heat pipe according to claim 1, characterized in that: In step two, the thickness of the titanium metal transition layer is 200 nm, the thickness of the zirconium oxide barrier layer is 1 μm, the Pt nanoparticles in the Pt-Al2O3 composite layer are embedded in the Al2O3 matrix, the thickness of the Pt-Al2O3 composite layer is 0.5 μm, and the deposition temperature of magnetron sputtering is 450 °C.

4. The manufacturing process of a tailless encapsulated heat pipe according to claim 1, characterized in that: In step three, the getter is a zirconium aluminum 16 type getter, and the getter loading is 50 mg / cm³. 3 .

5. The manufacturing process of a tailless encapsulated heat pipe according to claim 1, characterized in that: In step four, the weld depth of the first and second end caps and the heat pipe fitting is 0.8-1.2 mm and the width is 0.3 mm. Before the second end cap is prepared, the alkali metal reflux mesh is fixedly set in the working chamber.

6. The manufacturing process of a tailless encapsulated heat pipe according to claim 1, characterized in that: In step five, the alkali metal is a sodium-potassium alloy with a purity of ≥99.95% and an oxygen content of ≤50ppm. The amount of alkali metal filled is 22%-25% of the volume of the heat pipe fitting.

7. The manufacturing process of a tailless encapsulated heat pipe according to claim 1, characterized in that: In step six, the working temperature of the first sealing is 300℃, the sealing pressure is 5MPa, and the duration is 5 minutes. The working temperature of the second sealing is 150℃, the sealing pressure is 10MPa, and the duration is 2 minutes. The materials of the first and second end caps are 316L stainless steel, and the interface-strengthened bonding strength is ≥250MPa.

8. The manufacturing process of a tailless encapsulated heat pipe according to claim 1, characterized in that: In step seven, the test cycle conditions are as follows: temperature range -40℃ to 200℃, temperature rise / fall rate 30℃ / min, and the monitoring indicators are as follows: leakage rate change: ≤5×10 after 500 cycles. -10 Pa·m 3 / s, thermal resistance fluctuation: ΔR<0.05℃ / W.

9. A tailless encapsulated heat pipe manufactured according to any one of claims 1-8, characterized in that: The device includes a heat pipe fitting, with a first end cap and a second end cap at both ends. A composite isolation mesh is provided at both ends inside the heat pipe fitting. An air intake chamber is formed between the composite isolation mesh and the first end cap, and a working chamber is formed between the composite isolation mesh and the second end cap. An alkali metal reflux mesh is provided inside the working chamber.

10. A tailless encapsulated heat pipe manufactured according to the tailless encapsulation heat pipe manufacturing process according to claim 9, characterized in that: The first and second end caps are provided with a gas barrier coating, and a leak-proof layer is provided outside the gas barrier coating.

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