CN217363600U

CN217363600U - Aluminum temperature-uniforming plate and manufacturing mold thereof

Info

Publication number: CN217363600U
Application number: CN202220335597.5U
Authority: CN
Inventors: 张定概; 吴章贵; 王俊博
Original assignee: Meizhou Hongfuhan Technology Co ltd
Current assignee: Meizhou Hongfuhan Technology Co ltd
Priority date: 2022-02-18
Filing date: 2022-02-18
Publication date: 2022-09-02
Anticipated expiration: 2032-02-18

Abstract

The utility model provides an aluminium system temperature-uniforming plate, aluminium system temperature-uniforming plate includes upper cover and lower cover, set up netted capillary structure in the upper cover, the lower cover inboard sets up the aluminite powder sintering layer, a plurality of holes of aluminite powder sintering layer align to grid, the hole is used for installing the aluminium post, cup joint the powder circle on the aluminium post. The beneficial effects of the utility model reside in that: the internal capillary structure is sintered aluminum powder, has strong capillary capacity and high antipyretic power, and can provide good heat dissipation effect under the condition of counter gravity.

Description

Aluminum temperature-uniforming plate and manufacturing mold thereof

Technical Field

The utility model belongs to the technical field of heat-conduction, mainly relate to an aluminium system temperature-uniforming plate and preparation mould thereof.

Background

The development trend of electronic components is light weight and high power, under the background, a stronger heat dissipation element is needed to support the development, an aluminum temperature equalization plate is used as an efficient phase change heat transfer element, the aluminum temperature equalization plate can rapidly transfer heat accumulated on the surface of a heat source to a large-area condensation surface, the heat is rapidly transferred and dissipated through internal gas-liquid two-phase change, and compared with copper and copper alloy, the aluminum and aluminum alloy have the advantages of small specific gravity, low price, rich resources and the like, so the aluminum temperature equalization plate inevitably has a place in the mainstream heat dissipation market in the future

The inside capillary structure of the aluminium system temperature-uniforming plate of volume production is mostly the slot structure at present, and its capillary comprehensive properties is poor, and it is low to have a fever power, and can not satisfy the heat dissipation demand under the contrary gravity condition. Along with the continuous progress of the 5G technology, the production of more and more large power devices ensures that the traditional aluminum temperature-uniforming plate can not meet the requirements, and the liquid working medium has low reflux speed under the working environment of the antigravity, so that the heat transfer efficiency of the aluminum temperature-uniforming plate is reduced, and the heat dissipation requirement under the antigravity condition can not be met.

SUMMERY OF THE UTILITY MODEL

The defect to traditional aluminium system temperature equalization board fever power low of clearing away can not satisfy contrary gravity work demand, the utility model provides an aluminium system vapor chamber, its inside capillary structure is the sintering aluminite powder, and capillary ability is strong, and fever power height of clearing away, and can provide good radiating effect in contrary gravity condition. The method is realized through the following scheme.

The aluminum temperature-uniforming plate comprises an upper cover and a lower cover, wherein a reticular capillary structure is arranged in the upper cover, an aluminum powder sintered layer is arranged on the inner side of the lower cover, a plurality of holes are uniformly arranged in the aluminum powder sintered layer, the holes are used for mounting aluminum columns, and powder rings are sleeved on the aluminum columns.

Furthermore, the reticular capillary structure is formed by interlacing a plurality of grooves of 45 degrees and 135 degrees, the depth of each groove is 0.05-0.1mm, and the distance between every two adjacent grooves is 0.05-0.1 mm.

Furthermore, the positioning groove of the upper cover is matched with the positioning column of the lower cover, so that the upper cover is closed on the lower cover.

Furthermore, the end part of the upper cover is provided with a mounting groove for welding the liquid injection pipe.

The manufacturing mold for manufacturing the aluminum uniform-temperature plate comprises a powder ring sintering mold and a lower cover sintering mold, wherein the powder ring sintering mold comprises a powder ring sintering graphite upper cover and a powder ring sintering graphite lower cover and is used for sintering aluminum powder to form a powder ring and an aluminum column, and the lower cover sintering mold comprises base graphite, lower cover sintering graphite and a powder filling jig and is used for manufacturing lower cover sintering aluminum powder.

Furthermore, a plurality of grooves for filling aluminum powder are formed in the inner side of the powder ring sintered graphite lower cover, and a plurality of positioning holes are formed in the edge of the powder ring sintered graphite lower cover; the inner side of the powder ring sintered graphite upper cover is provided with a plurality of limiting rings corresponding to the grooves, the edge of the powder ring sintered graphite upper cover is provided with a plurality of positioning columns, and the positioning columns cover the positioning holes, so that the powder ring sintered graphite upper cover and the powder ring sintered graphite lower cover are fixed.

Further, the height of the limiting ring in the upper powder ring sintered graphite cover is 60% -90% of the depth of the limiting groove in the lower powder ring sintered graphite cover.

Furthermore, the recess of base graphite is used for putting the lower cover, fill the powder tool setting and keep certain clearance in the lower cover, fill the powder mouth of filling on the powder tool and be used for filling powder.

Furthermore, the lower cover sintered graphite is used for replacing the powder filling jig after powder filling is completed and is connected with the lower cover.

Furthermore, the height of the limiting column of the lower cover sintered graphite is 10-40% higher than that of the limiting column of the powder filling jig.

The beneficial effects of the utility model reside in that: the internal capillary structure is sintered aluminum powder, has strong capillary capacity and high antipyretic power, and can provide good heat dissipation effect under the condition of counter gravity.

Drawings

Fig. 1 is a schematic structural view of an aluminum vapor chamber in an embodiment of the present invention.

Fig. 2 is a schematic view of the capillary structure of the upper cover of the aluminum vapor chamber in the embodiment of the present invention.

FIG. 3 is a schematic diagram of a sintered graphite structure of a powder ring according to an embodiment of the present invention.

FIG. 4 is a schematic view of the structure of the sintered graphite upper cover of the powder ring in the embodiment of the present invention.

Fig. 5 is a schematic structural view of a lower cover of sintered graphite of powder ring in the embodiment of the present invention.

Fig. 6 is a schematic view of the combination of the upper cover and the lower cover of the aluminum vapor chamber in the embodiment of the present invention.

Fig. 7 is a schematic structural view of a powder filling jig for a lower cover of an aluminum vapor chamber in an embodiment of the present invention.

Fig. 8 is a schematic structural view of sintered graphite of the lower cover of the aluminum vapor chamber in the embodiment of the present invention.

Fig. 9 is a schematic view of a capillary sintering structure of a lower cover of an aluminum vapor chamber in an embodiment of the present invention.

Fig. 10 is a schematic structural diagram of an aluminum vapor chamber in an embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the following examples, which are only part of the examples of the present invention, and these examples are only used to explain the present invention, and do not limit the scope of the present invention.

As shown in fig. 2, 3 and 10, an aluminum vapor chamber 10 comprises an upper cover 1 and a lower cover 2, wherein a mesh capillary 11 is arranged on the inner side of the upper cover, an aluminum powder sintered layer 3 is arranged in the lower cover, a plurality of holes 31 are uniformly arranged on the aluminum powder sintered layer, the holes are used for mounting an aluminum column 5, a powder ring 4 is sleeved on the aluminum column, the mesh capillary 11 is formed by staggering a plurality of grooves of 45 degrees and 135 degrees, the depth of each groove is 0.05-0.1mm, and the distance between every two adjacent grooves is 0.05-0.1 mm.

The upper cover 1 is covered on the lower cover 2 and is matched with the positioning column 21 of the lower cover through the positioning groove 13 of the upper cover.

The end of the upper cover is provided with an installation groove 15 for welding the liquid injection pipe 6.

The aluminum temperature-uniforming plate is also manufactured by a set of manufacturing dies. The following description will be made in conjunction with the production steps.

As shown in fig. 1-10, the manufacturing method of the aluminum vapor chamber by using the manufacturing mold comprises the following steps:

step 1, stamping an upper cover and a lower cover by using a die, wherein the upper cover and the lower cover are made of composite aluminum alloy, specifically 3003 aluminum alloy and 4045 aluminum alloy, the 4045 aluminum alloy accounts for 10-20% of the thickness, and the concave surface of the middle lower cover is made of 4045 aluminum alloy.

The material of the upper cover and the lower cover can also be other single-component aluminum alloy or two-layer or three-layer composite aluminum alloy or copper-aluminum composite material, such as 3003 aluminum alloy, 4045 aluminum alloy, 3003 aluminum alloy, 4343 aluminum alloy, 3003 aluminum alloy and the like.

And 2, after stamping, ultrasonically cleaning the steel plate for 3-10min by using alcohol or acetone so as to remove oil stains on the surface.

Step 3, as shown in fig. 6-9, after cleaning, the lower cover 2 is placed in the base graphite 83, the powder filling jig 85 is placed in the lower cover, a certain gap is formed between the powder filling jig 85 and the lower cover 2, aluminum powder is uniformly filled in the gap through a powder filling port 852 (shown in fig. 7) on the powder filling jig, after powder filling is completed, the powder filling jig is taken down, and the lower cover is covered with the sintered graphite 81 (shown in fig. 8). The height of the limiting column 811 of the lower cover sintered graphite 81 is 10-40% higher than that of the limiting column 851 of the powder filling jig, because the aluminum has active chemical property, an oxide film is easy to form on the surface, and the oxide film can not be reduced by hydrogen, so pressure is required to be applied in the sintering process to achieve the effect of damaging the oxide layer, so that fresh aluminum is exposed, and metallurgical bonding can be formed at the temperature not higher than the melting point.

Sintering the mixture in a hot pressing furnace at the sintering temperature of 500-650 ℃ for 1-5h under the sintering pressure of 0.5-2kg/mm2, and introducing pure nitrogen or nitrogen-hydrogen mixed gas for protection during sintering.

In the preferred embodiment of the present invention, the sinterable temperature is 600 ℃, the sintering time is 3 hours, the sintering pressure is 1kg/mm2, the protective gas is pure nitrogen, the lower cover sintered graphite is taken out after the sintering is completed, the lower cover aluminum powder is tightly combined with the lower cover, and the porosity of the lower cover aluminum powder is 30-50%.

In other embodiments of the present invention, the autoclave can be replaced with resistance welding.

And 4, processing a reticular capillary 11 on the upper cover by using a laser etching machine, wherein the reticular capillary 11 is formed by interlacing a plurality of grooves with the angles of 45 degrees and 135 degrees as shown in figure 2, the depth of each groove is 0.05-0.1mm, and the distance between every two adjacent grooves is 0.05-0.1 mm. When the upper cover material is a composite material of 3003 aluminum alloy and 4045 aluminum alloy, the processed surface is 4045 material.

Step 5, as shown in fig. 3, 4 and 5, the powder ring sintered graphite 7 is used for manufacturing an aluminum alloy powder ring, aluminum powder is uniformly scattered in the groove 75 of the powder ring sintered graphite lower cover 72, after the groove is filled with the aluminum powder, the excess aluminum powder is removed, and the powder ring sintered graphite upper cover 71 is covered in the positioning hole 76 of the powder ring sintered graphite lower cover through the four positioning columns 73. Wherein the height of the limiting ring 74 in the upper powder ring sintered graphite cover is 60 to 90 percent of the depth of the limiting groove 75 in the lower powder ring sintered graphite cover. The aim is to compress the aluminum powder in the sintering process, and the aluminum powder can be extruded mutually to remove an oxide layer, thereby realizing the metallurgical bonding of aluminum and aluminum.

The utility model discloses a sintering temperature that uses in the preferred embodiment is 600 ℃, and the sintering time is 3h, and sintering pressure is 1kg/mm2, and protective gas is pure nitrogen gas, takes off powder circle sintered graphite upper cover after the sintering, takes out the powder circle that is located powder circle sintered graphite lower cover recess, and the powder circle porosity is 30% -50%.

Step 6, as shown in fig. 1 and 9, placing the aluminum column 5 in the hole 31 of the sintered lower cover aluminum powder in S1, sleeving the powder ring 4 taken down in S3 on the aluminum column, and then covering the upper cover 1 processed by laser engraving in S2 on the lower cover 2 to match with the positioning column 21 of the lower cover through the positioning groove 13 of the upper cover.

After the combination, the graphite is put into base graphite 83, as shown in figure 10, then the graphite is sintered in a hot pressing furnace, the sintering temperature is 570-630 ℃, the sintering time is 1-5h, the sintering pressure is 0.5-2kg/mm2, pure nitrogen or nitrogen-hydrogen mixed gas is introduced for protection during sintering, and a semi-finished product is formed after sintering.

The sintering temperature used in the preferred embodiment of the utility model is 620 ℃, the sintering time is 1h, the sintering pressure is 0.5kg/mm2, and the protective gas is pure nitrogen.

In other embodiments of the present invention, the autoclave may be replaced with a brazing process.

And 7, as shown in FIG. 10, welding the liquid injection pipe 6 with the semi-finished product sintered in S6 by using high-frequency welding, vacuumizing and injecting a working medium, which is generally acetone or R1233zd refrigerant, into the liquid injection pipe 6 after welding, wherein the working medium is required to be filled in a negative pressure filling device, clamping the liquid injection pipe after injecting the working medium, and then sealing and welding the liquid injection pipe by using argon arc welding.

In the embodiment of the utility model, the welding of the liquid injection pipe and the sintered semi-finished product can be replaced by using a brazing furnace for welding.

In other embodiments of the present invention, the powder burning process adopts a hot pressing sintering process, the sintering temperature is 500-650 ℃, the sintering time is 1-5h, the sintering pressure is 0.5-2kg/mm2, and pure nitrogen or nitrogen-hydrogen mixed gas is introduced for protection during sintering.

The aluminum temperature equalizing plate of the utility model can provide good heat dissipation effect under the condition of counter-gravity. The temperature equalizing plate for burning powder on the market is generally made of copper, the upper cover and the lower cover are made of pure copper, the support is made of pure copper, the powder column is made of pure copper powder, the capillary of the lower cover is made of copper powder (or a copper net), and the capillary of the upper cover is made of a copper net. The principle and reason are as follows: the metal activity of copper is arranged behind hydrogen in sequence, so that the copper can be reduced by introducing nitrogen-hydrogen mixed gas at high temperature, the reduced and leaked pure copper can be combined with each other at the temperature (900-.

The utility model discloses a antigravity heat dissipation principle is similar with copper samming board principle, and the difficult point lies in the combination between the aluminite powder granule, and this is because aluminium chemical property is lively, and the surface very easily forms the oxide film, and high (2050 ℃) of melting point and oxide film can not pass through hydrogen reduction, so need exert pressure in sintering process, reach the effect of destroying the oxide layer, make fresh aluminium expose, can form metallurgical combination under being not higher than melting point temperature. From the internal structure of the aluminum temperature equalization plate, the laser etching net structure of the upper cover has a capillary effect, and the capillary capacity can resist gravity to climb against gravity after absorbing working media (acetone and ethanol). Similarly, the aluminum powder of the lower cover has stronger capillary capacity, and the upper cover and the lower cover are connected in a capillary way by the powder ring connected between the upper cover and the lower cover, so that the whole aluminum powder has complete capillary capacity. That is, good heat dissipation can be performed under the condition of counter-gravity. However, the internal capillaries of the aluminum temperature equalization plate on the market at present are fins, grooves and the like, the capillary capacity is much lower than that of aluminum powder, the capillary structure is discontinuous (the middle support does not have the capillary effect), the aluminum temperature equalization plate cannot work under the condition of counter gravity, and the aluminum temperature equalization plate can only work under the condition of positive gravity (water on a condensation surface naturally drips to an evaporation surface through gravity).

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with reference to the preferred embodiment, it is not intended to limit the present invention, and any person skilled in the art can make some changes or modifications to equivalent embodiments without departing from the scope of the present invention, and any simple modification, equivalent change or modification made to the above embodiments according to the technical essence of the present invention will still fall within the scope of the technical solution of the present invention.

Claims

1. The aluminum temperature-uniforming plate is characterized by comprising an upper cover and a lower cover, wherein a mesh capillary structure is arranged in the upper cover, an aluminum powder sintered layer is arranged on the inner side of the lower cover, a plurality of holes are uniformly arranged in the aluminum powder sintered layer, the holes are used for mounting aluminum columns, and powder rings are sleeved on the aluminum columns.

2. The aluminum vapor chamber as set forth in claim 1, wherein the mesh-like capillary structure is formed by interlacing a plurality of grooves of 45 ° and 135 °, the grooves having a depth of 0.05-0.1mm and a distance of 0.05-0.1mm between adjacent grooves.

3. The aluminum vapor chamber as defined in claim 1, wherein the positioning groove of the upper cover is engaged with the positioning post of the lower cover, such that the upper cover is engaged with the lower cover.

4. The aluminum temperature equalization plate of claim 1, wherein the end of the upper cover is provided with an installation groove for welding a liquid injection pipe.

5. A mold for manufacturing an aluminum vapor chamber, which is used for manufacturing the aluminum vapor chamber as claimed in any one of claims 1 to 4, comprising: the powder ring sintering mold comprises a powder ring sintering graphite upper cover and a powder ring sintering graphite lower cover and is used for sintering aluminum powder to form a powder ring and an aluminum column, and the lower cover sintering mold comprises base graphite, lower cover sintering graphite and a powder filling jig and is used for manufacturing lower cover sintering aluminum powder.

6. The manufacturing mold according to claim 5, wherein the powder ring sintered graphite lower cover is provided with a plurality of grooves for filling aluminum powder on the inner side and a plurality of positioning holes on the edge; the inner side of the powder ring sintered graphite upper cover is provided with a plurality of limiting rings corresponding to the grooves, the edge of the powder ring sintered graphite upper cover is provided with a plurality of positioning columns, and the positioning columns cover the positioning holes, so that the powder ring sintered graphite upper cover and the powder ring sintered graphite lower cover are fixed.

7. The manufacturing mold as claimed in claim 6, wherein the height of the limiting ring in the upper powder ring sintered graphite cover is 60-90% of the depth of the limiting groove in the lower powder ring sintered graphite cover.

8. The mold as claimed in claim 6, wherein the graphite groove of the base is used for placing a lower cover, the powder filling jig is disposed in the lower cover and keeps a certain gap, and a powder filling opening of the powder filling jig is used for filling powder.

9. The manufacturing mold as claimed in claim 8, wherein the sintered graphite of the lower cover is used to replace the powder filling jig after the powder filling is completed, and is connected to the lower cover.

10. The manufacturing mold as claimed in claim 9, wherein the height of the position-limiting column of the sintered graphite of the lower cover is about 10-40% higher than the height of the position-limiting column of the powder-filling jig.