CN116147390A - Inverse opal copper wool fine liquid suction core structure and manufacturing method thereof - Google Patents
Inverse opal copper wool fine liquid suction core structure and manufacturing method thereof Download PDFInfo
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- CN116147390A CN116147390A CN202310061926.0A CN202310061926A CN116147390A CN 116147390 A CN116147390 A CN 116147390A CN 202310061926 A CN202310061926 A CN 202310061926A CN 116147390 A CN116147390 A CN 116147390A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure
- F28D15/046—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure characterised by the material or the construction of the capillary structure
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Abstract
The invention relates to an inverse opal copper capillary liquid suction core structure and a manufacturing method, wherein the manufacturing method comprises the following steps that a plurality of microspheres are uniformly distributed on a copper substrate, sintering necks are formed among the microspheres through a sintering process, nano-scale copper particles are arranged in gaps of the microspheres, the nano-scale copper particles form a stable copper structure, the microspheres and the sintering necks on the copper substrate are removed, a plurality of spherical cavities and sintering neck cavities are formed in the copper structure, the spherical cavities and the sintering neck cavities are respectively matched with the microspheres and the sintering necks, and the spherical cavities are communicated through the sintering neck cavities. Firstly, uniformly and densely distributing a plurality of microspheres on a copper substrate, arranging nanoscale copper particles in gaps of the microspheres, enabling the nanoscale copper particles to form a stable copper structure, and forming a plurality of spherical cavities and sintering neck cavities in the copper structure after the microspheres and the sintering necks are removed. Under the synergistic effect of permeability and capillary force, the capillarity of the inverse opal copper capillary wick structure is further optimized.
Description
Technical Field
The invention belongs to the technical field of capillary liquid suction cores of heat pipes, and particularly relates to an inverse opal copper capillary liquid suction core structure and a manufacturing method thereof.
Background
With miniaturization and high integration of electronic devices, power of electronic devices, especially chips, is continuously increasing, and heat generation problems are also more serious, so that heat dissipation problems of electronic devices are more urgent under the trend of gradually compacting electronic devices. Phase change heat transfer technology is an excellent option to address the problem of high heat flux density in such small spaces. The phase-change heat transfer technology utilizes the latent heat of liquid-vapor phase change in the vacuum cavity to bear heat, and transfers the heat in the gas-liquid circulation, wherein the capillary wick is a core structure for realizing the gas-liquid circulation, and provides more vaporization cores for enhancing boiling for phase-change heat transfer while playing the role of liquid reflux, thereby realizing efficient latent heat exchange.
Common capillary wicks include copper wire mesh, sintered copper powder, micro-grooved structures, and the like.
Taking the sintered copper powder with a relatively flexible practical structure in the prior art as an example, pores for copper powder sintering provide good channels for transmission of working media, and the following technical problems exist:
its porosity is usually only 50% -60%, and its permeability is relatively low, resulting in a large osmotic resistance. But the relatively smaller pores can further improve the capillary force of the structure and play a positive role in the internal transmission of working media.
Only the synergistic effect of the permeability and the capillary force can better show the capillary performance of the structure, so how to balance the two sizes of the permeability and the capillary force is the key for further optimizing the performances of various capillary structures.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, one of the purposes of the invention is as follows: the manufacturing method of the inverse opal copper capillary wick structure can be used for preparing the capillary wick structure with Gao Maoxi force and high permeability, and has excellent performance in the aspects of enhanced boiling and phase change heat transfer.
Aiming at the technical problems in the prior art, the second purpose of the invention is as follows: an inverse opal copper capillary wick structure is provided.
The invention aims at realizing the following technical scheme:
a manufacturing method of a reverse opal copper capillary liquid suction core structure comprises the following steps that a plurality of microspheres are uniformly and densely distributed on a copper substrate, sintering necks are formed among the microspheres through a sintering process, nanoscale copper particles are arranged in gaps of the microspheres, the nanoscale copper particles form a stable copper structure, the microspheres and the sintering necks on the copper substrate are removed, a plurality of spherical cavities and sintering neck cavities are formed in the copper structure, the spherical cavities and the sintering neck cavities are respectively matched with the microspheres and the sintering necks, and the spherical cavities are communicated through the sintering neck cavities.
Further, the method for uniformly and densely distributing the plurality of microspheres on the copper substrate is realized by spraying the uniformly and densely distributed high polymer polystyrene microspheres on the copper substrate by using a spray pen.
Further, the implementation mode of uniformly and densely distributing a plurality of microspheres on the copper substrate is that polystyrene microspheres are prepared into slurry, and the microspheres are uniformly distributed on the copper substrate by using substrate dispensing.
Further, the nano-scale copper particles are arranged in the gaps of the microspheres, and the nano-scale copper particles form a stable copper structure.
Further, the removal of the plurality of microspheres and sintering necks on the copper substrate is accomplished by high temperature removal of the polymeric polystyrene microspheres and sintering necks, leaving spherical cavities and sintering neck cavities in the copper structure.
Further, the method comprises the following steps,
step A, cleaning a copper substrate: soaking a copper substrate in 0.1mol/L hydrochloric acid, ultrasonically cleaning for 3min, removing the substrate, cleaning with deionized water, soaking in absolute ethyl alcohol, ultrasonically cleaning for 3min, taking out, cleaning with deionized water, and wiping clean with dust-free paper;
step B, preparing polystyrene polymer suspension: weighing 0.2g of polystyrene microsphere particles, measuring 5ml of absolute ethyl alcohol by a measuring cylinder, pouring the polystyrene microsphere particles into the absolute ethyl alcohol, and uniformly stirring to form a suspension;
step C, microsphere assembly: regulating the liquid flow speed to be 0.08 ml/s-0.1 ml/s by using a spray pen, enabling the gas-liquid ratio to be 3:1, uniformly spraying the polystyrene suspension on the surface of the copper substrate, and leaving the length of 10 mm;
step D, baking for 180 minutes in an oven with the set temperature of 120 ℃;
step E, preparing a copper deposition solution: 160-240 g of copper sulfate pentahydrate and 60-80 g of sulfuric acid are taken and mixed into an acidic copper sulfate solution, and then two drops of hydrochloric acid are dripped;
step F, electrodeposition: taking direct current of 0.1-0.15A, connecting the vacant 10mm part of the sample plate to a power cathode, immersing the rest part into deposition liquid, connecting an anode to a pure copper electrode, and depositing for 3h;
step G, removing the template: the sample was placed in a 500 ℃ vacuum oven for 1.5h and removed to obtain an inverse opal copper wick.
The anti-opal copper capillary liquid suction core structure is prepared by adopting a manufacturing method of the anti-opal copper capillary liquid suction core structure, and comprises a copper substrate, wherein a plurality of spherical cavities and sintering neck cavities are uniformly and densely distributed on the copper substrate, the spherical cavities are communicated through the sintering neck cavities, nano-scale copper particles are arranged in gaps among the spherical cavities, and a stable copper structure is formed.
Further, the copper substrate has a length of 105 to 110mm, a width of 9 to 11mm, and a thickness of 0.5 to 0.8mm.
Further, the spherical cavity size was 5 μm.
Further, the capillary wick has a length of 95 to 100mm, a width of 9 to 10.5mm, and a thickness of 30 to 50. Mu.m.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, copper powder space and pore space of conventional sintered copper powder are exchanged, a plurality of microspheres are uniformly distributed on a copper substrate, adjacent microspheres are connected through sintering necks, nanoscale copper particles are arranged in gaps of the microspheres, the nanoscale copper particles form a stable copper structure, and then the microspheres and the sintering necks on the copper substrate are removed. After the microspheres and the sintering necks are removed, a plurality of spherical cavities and sintering neck cavities which are respectively matched with the microspheres and the sintering necks are formed in the copper structure, and the spherical cavities are communicated through the sintering neck cavities, so that the inverse opal copper capillary liquid suction core structure is prepared. The structure has high capillary force generated by nano copper particles and high permeability generated by microsphere cavities, has excellent performance in the aspects of enhanced boiling and phase change heat transfer, and is a preferred scheme of a capillary wick structure in a heat pipe. Under the synergistic effect of permeability and capillary force, the capillary performance of the inverse opal copper capillary wick structure is further optimized.
Drawings
Fig. 1 is a schematic diagram of the structure of an inverse opal copper capillary wick according to the present invention.
In the figure:
1-copper substrate, 2-microsphere, 3-copper particle, 4-spherical cavity, 5-sintering neck cavity.
Detailed Description
The conventional capillary liquid suction core comprises a copper wire mesh, sintered copper powder, a micro-groove structure and the like, and the sintered copper powder with a relatively flexible practical structure is taken as an example, and pores sintered by the copper powder provide good channels for the transmission of working media, but the porosity of the capillary liquid suction core is only 50-60%, the permeability of the capillary liquid suction core is relatively low, and large penetration resistance is caused. But the relatively small pores can further improve the capillary force of the structure and play a positive role in the internal transmission of working media. Therefore, the synergistic effect of the permeability and the capillary force can only show the capillary performance of the structure, and how to balance the permeability and the capillary force is the key to further optimize the various capillary structure performances. Therefore, the copper powder space and the pore space are exchanged to prepare the inverse opal copper structure, and the sintering channel of the inverse opal copper is continuously enlarged, so that the permeability of the structure is greatly increased while the capillary force is not excessively damaged, and the capillary performance is improved. However, the current common method for preparing the inverse opal copper liquid absorption core is too complicated, and especially the self-assembly process of the microsphere 2 needs to consume a lot of time or needs to adopt extremely complex equipment and process, so that the industrialization of the capillary structure is difficult to realize.
Therefore, the invention provides a simple and direct method for preparing the inverse opal copper liquid absorption core structure, and the microsphere 2 is assembled through a spraying process, so that the good capillary force and permeability of the inverse opal structure are realized, and the manufacturing efficiency of the structure is greatly improved.
The present invention is described in further detail below.
Example 1
As shown in fig. 1, this embodiment provides a capillary wick structure based on inverse opal copper, which includes a copper substrate 1, a plurality of spherical cavities 4 and sintering neck cavities 5 are uniformly and densely distributed on the copper substrate 1, the spherical cavities 4 are communicated through the sintering neck cavities 5, nano-scale copper particles 3 are arranged in gaps between the spherical cavities 4, and a stable copper structure is formed.
Specifically, high polymer polystyrene microspheres 2 uniformly and densely distributed are sprayed on a copper substrate 1 by using a spray pen, or the high polymer polystyrene microspheres 2 are prepared into slurry, the microspheres 2 are uniformly distributed on the copper substrate 1 by using substrate dispensing, sintering necks are formed among the microspheres 2 by a sintering process, nanoscale copper particles 3 are grown in gaps of the microspheres 2 by using an electrodeposition technology, then a stable copper structure is formed by sintering the nano copper particles 3 at a high temperature, meanwhile, the high polymer polystyrene microspheres 2 and the sintering necks are removed at a high temperature, spherical cavities 4 and sintering neck cavities 5 are left in the copper structure, and connecting channels are formed among the spherical cavities 4 by the sintering neck cavities 5.
In this embodiment, the copper substrate has a length of 105-110 mm, a width of 9-11 mm, and a thickness of 0.5-0.8 mm. The size of the selected macromolecular polystyrene microsphere 2 is 5 mu m. The length of the capillary liquid absorption core is 95-100 mm, the width is 9-10.5 mm, and the thickness is 30-50 mu m.
The manufacturing method of the inverse opal copper capillary liquid suction core comprises the following steps:
step A, soaking the copper substrate 1 in 0.1mol/L hydrochloric acid, ultrasonically cleaning for 3min, removing the substrate, cleaning with deionized water, soaking in absolute ethyl alcohol, ultrasonically cleaning for 3min, taking out, cleaning with deionized water, and wiping clean with dust-free paper.
And B, preparing polystyrene polymer suspension, weighing 0.2g of polystyrene microsphere 2 particles, measuring 5ml of absolute ethyl alcohol by a measuring cylinder, pouring the polystyrene microsphere 2 into the absolute ethyl alcohol, and uniformly stirring to form the suspension.
And C, regulating the liquid flow speed to be 0.08 ml/s-0.1 ml/s by using a spray pen, enabling the gas-liquid ratio to be 3:1, uniformly spraying the polystyrene suspension on the surface of the copper substrate 1, and leaving the length of 10 mm.
And D, baking for 180min in an oven with the set temperature of 120 ℃.
And E, preparing a copper deposition solution, mixing 160-240 g of copper sulfate pentahydrate and 60-80 g of sulfuric acid to obtain an acidic copper sulfate solution, and then dripping two drops of hydrochloric acid.
And F, taking direct current of 0.1-0.15A, connecting the vacant 10mm part of the sample plate to a power cathode, immersing the rest part into the deposition liquid, connecting the anode to a pure copper electrode, and depositing for 3h.
And G, placing the sample in a vacuum oven at 500 ℃ for baking for 1.5 hours, and taking out to obtain the inverse opal copper liquid absorption core.
Example 2
This embodiment differs from embodiment 1 in that: in the microsphere 2 assembling process in the step C, the suspension of the polystyrene microsphere 2 can be poured into a dispensing container as slurry, and the polystyrene microsphere 2 is uniformly sprayed on a substrate by using a dispensing machine.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts the inverse opal copper liquid absorption core structure, thereby improving the permeability of the liquid absorption core while ensuring the capillary force and greatly improving the capillary performance.
2. The invention adopts a spray coating process or a dispensing printing mode to realize the assembly of the microsphere 2, thereby greatly improving the process realizability of the speed of the assembly of the microsphere 2 and reducing the material consumption and the manufacturing cost.
3. The invention has the effect on industrialized application, promotes the application of the inverse opal copper structure as a capillary structure in the field of ultrathin vapor chamber, and provides a better scheme for heat dissipation of high-integration electronic products such as chips and the like.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (10)
1. The manufacturing method of the inverse opal copper capillary wick structure is characterized by comprising the following steps of: the method comprises the following steps that a plurality of microspheres are uniformly and densely distributed on a copper substrate, sintering necks are formed among the microspheres through a sintering process, nanoscale copper particles are arranged in gaps of the microspheres, the nanoscale copper particles form a stable copper structure, the microspheres and the sintering necks on the copper substrate are removed, a plurality of spherical cavities and sintering neck cavities are formed in the copper structure, the spherical cavities and the sintering neck cavities are respectively matched with the microspheres and the sintering necks, and the spherical cavities are communicated through the sintering neck cavities.
2. A method of making an inverse opal copper capillary wick structure in accordance with claim 1, wherein: the realization mode of uniformly and densely distributing a plurality of microspheres on the copper substrate is that a spray pen is used for spraying the uniformly and densely distributed high polymer polystyrene microspheres on the copper substrate.
3. A method of making an inverse opal copper capillary wick structure in accordance with claim 1, wherein: the realization mode of uniformly and densely distributing a plurality of microspheres on the copper substrate is that polystyrene microspheres are prepared into slurry, and the microspheres are uniformly distributed on the copper substrate by using substrate dispensing.
4. A method of making an inverse opal copper capillary wick structure in accordance with claim 1, wherein: the nano-scale copper particles are arranged in the gaps of the microspheres, and the nano-scale copper particles form a stable copper structure.
5. A method of making an inverse opal copper capillary wick structure in accordance with claim 1, wherein: the removal of the plurality of microspheres and sintering necks on the copper substrate is accomplished by high temperature removal of the polymeric polystyrene microspheres and sintering necks, leaving spherical cavities and sintering neck cavities in the copper structure.
6. A method of making an inverse opal copper capillary wick structure in accordance with claim 1, wherein: comprises the steps of,
step A, cleaning a copper substrate: soaking a copper substrate in 0.1mol/L hydrochloric acid, ultrasonically cleaning for 3min, removing the substrate, cleaning with deionized water, soaking in absolute ethyl alcohol, ultrasonically cleaning for 3min, taking out, cleaning with deionized water, and wiping clean with dust-free paper;
step B, preparing polystyrene polymer suspension: weighing 0.2g of polystyrene microsphere particles, measuring 5ml of absolute ethyl alcohol by a measuring cylinder, pouring the polystyrene microsphere particles into the absolute ethyl alcohol, and uniformly stirring to form a suspension;
step C, microsphere assembly: regulating the liquid flow speed to be 0.08 ml/s-0.1 ml/s by using a spray pen, enabling the gas-liquid ratio to be 3:1, uniformly spraying the polystyrene suspension on the surface of the copper substrate, and leaving the length of 10 mm;
step D, baking for 180 minutes in an oven with the set temperature of 120 ℃;
step E, preparing a copper deposition solution: 160-240 g of copper sulfate pentahydrate and 60-80 g of sulfuric acid are taken and mixed into an acidic copper sulfate solution, and then two drops of hydrochloric acid are dripped;
step F, electrodeposition: taking direct current of 0.1-0.15A, connecting the vacant 10mm part of the sample plate to a power cathode, immersing the rest part into deposition liquid, connecting an anode to a pure copper electrode, and depositing for 3h;
step G, removing the template: the sample was placed in a 500 ℃ vacuum oven for 1.5h and removed to obtain an inverse opal copper wick.
7. An inverse opal copper capillary wick structure, which is characterized in that: the manufacturing method for the inverse opal copper capillary fine liquid suction core structure comprises the steps of preparing a copper substrate, uniformly and densely distributing a plurality of spherical cavities and sintering neck cavities on the copper substrate, communicating the spherical cavities through the sintering neck cavities, arranging nano-scale copper particles in gaps among the spherical cavities, and forming a stable copper structure.
8. A reverse opal copper capillary wick structure according to claim 7, characterized in that: the length of the copper substrate is 105-110 mm, the width is 9-11 mm, and the thickness is 0.5-0.8 mm.
9. A reverse opal copper capillary wick structure according to claim 7, characterized in that: the spherical cavity size was 5 μm.
10. A reverse opal copper capillary wick structure according to claim 7, characterized in that: the length of the capillary liquid absorption core is 95-100 mm, the width is 9-10.5 mm, and the thickness is 30-50 mu m.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116899639A (en) * | 2023-06-30 | 2023-10-20 | 上海金鑫生物科技有限公司 | Microfluidic device and application thereof |
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| CN116899639A (en) * | 2023-06-30 | 2023-10-20 | 上海金鑫生物科技有限公司 | Microfluidic device and application thereof |
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