CN115351280B - Integrated preparation method of evaporator for loop heat pipe - Google Patents
Integrated preparation method of evaporator for loop heat pipe Download PDFInfo
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- CN115351280B CN115351280B CN202211007100.8A CN202211007100A CN115351280B CN 115351280 B CN115351280 B CN 115351280B CN 202211007100 A CN202211007100 A CN 202211007100A CN 115351280 B CN115351280 B CN 115351280B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 16
- 238000005245 sintering Methods 0.000 claims abstract description 16
- 238000011065 in-situ storage Methods 0.000 claims abstract description 11
- 238000009694 cold isostatic pressing Methods 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000000151 deposition Methods 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000001257 hydrogen Substances 0.000 claims abstract description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 6
- 239000011148 porous material Substances 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000008021 deposition Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 6
- 239000002826 coolant Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009766 low-temperature sintering Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910001119 inconels 625 Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/002—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature
- B22F7/004—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature comprising at least one non-porous part
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
-
- 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
- F28D15/0266—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 separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
-
- 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
Abstract
The invention discloses an integrated preparation method of an evaporator for a loop heat pipe, which comprises the following steps: 1. performing cold isostatic pressing on carbonyl nickel powder; 2. carrying out shape processing on the porous capillary core pressed compact; 3. sintering the porous capillary core pressed compact in a hydrogen atmosphere; 4. and (3) taking metal powder as a raw material, depositing a compact shell on the surface of the porous capillary core in situ, and then processing again according to the characteristic size of the evaporator to obtain the evaporator for the loop heat pipe. The invention adopts cold isostatic pressing to obtain the porous capillary core pressed compact, adopts in-situ deposition to deposit a compact shell on the surface of the porous capillary core, and forms metallurgical bonding with the surface of the porous capillary core, thereby obtaining the porous capillary core with small aperture and high porosity, realizing the balance between the permeation resistance of the porous capillary core and the capillary force, eliminating the extra thermal resistance between the porous capillary core and the evaporator shell for the existing loop heat pipe, and effectively improving the heat exchange efficiency of the evaporator for the loop heat pipe.
Description
Technical Field
The invention belongs to the technical field of evaporators for loop heat pipes, and particularly relates to an integrated preparation method of an evaporator for loop heat pipes.
Background
Loop Heat Pipes (LHP) are new heat control technologies developed gradually based on the split heat pipe technology, and compared with the traditional method of forced convection heat exchange by means of single-phase fluid, the Loop heat pipes are compact, flexible in design and high in heat exchange efficiency, and are widely applied to thermal management in electronic information technology.
In the LHP system, the capillary wick structure in the evaporator is not only an important source for providing working medium circulating power, but also a most critical part for organizing the efficient and stable progress of the internal heat and mass transfer process of the whole LHP system, and is also regarded as the heart structure of the whole heat transfer system. Through research and experiments, the core technical indexes of the porous capillary core for the LHP system comprise: porosity and pore size. The power of the coolant in the loop heat pipe is derived from capillary force generated by the pore structure, and the capillary force is inversely proportional to the pore diameter, namely, the smaller the pore diameter is, the larger the capillary force is, the higher the power of the coolant is, and the higher the cooling efficiency of the LHP system is. On the other hand, the three-dimensionally communicated pore structure of the capillary wick is also a movement channel of the coolant, and the larger the channel is, i.e., the higher the porosity is, the smaller the resistance to the flow of the coolant is. Thus, porous capillary cores are generally required to have porosities in excess of 50% to achieve the lowest flow resistance and achieve an increase in cooling efficiency of the LHP system.
However, for the porous capillary core reported in the prior art, the pore diameter and the porosity of the porous material often show a difficult-to-achieve relationship due to the limitation of powder raw materials, preparation process and other factors. I.e., the smaller the pore size, the lower the porosity; the larger the pore size, the higher the porosity. In addition, from the aspect of component equipment, the porous capillary core is prepared by adopting a powder metallurgy technology, and then the porous capillary core and an external shell are assembled and connected, so that the main flow preparation process of the evaporator for the LHP is simple in process route and low in manufacturing cost, but gaps which are far larger than the pore size of the porous capillary core and are generated between the prepared porous capillary core and a compact shell exist, and the existence of the gaps can cause the system thermal resistance of a loop heat pipe to be greatly increased, so that the heat exchange efficiency of the whole LHP system is seriously influenced.
For this reason, the patent of application No. 201610666748.4 discloses a method and a device for connecting a capillary core and a compact shell, but the requirement on the dimensional accuracy of a die is extremely high, and the preparation process is very complex. In addition, patent application No. 201910576785.X discloses that powder is used as an adhesive, and metallurgical bonding between a dense shell and a porous capillary core is achieved through high-temperature sintering, but the powder adhesive is difficult to uniformly coat on the surface of the porous capillary core in practical situations, so that extra thermal resistance of a system is increased.
Therefore, there is a need for an integrated fabrication method for an evaporator for loop heat pipes.
Disclosure of Invention
The invention aims to solve the technical problem of providing an integrated preparation method of an evaporator for a loop heat pipe aiming at the defects of the prior art. The method adopts cold isostatic pressing technology, optimizes the powder raw materials, and realizes the preparation of the porous capillary core with small pore diameter and high porosity by low-temperature sintering technology under the background of fully grasping the formation mechanism of the pore structure of the material in the powder pressing-sintering process. In addition, the porous capillary core is processed in a pressed state, so that the pore structure of the surface of the porous capillary core is ensured not to be damaged. Finally, a compact shell blank is deposited on the surface of the porous capillary core in situ, and the evaporator meeting the size requirement and the performance requirement is obtained after processing.
In order to solve the technical problems, the invention adopts the following technical scheme: the integrated preparation method of the evaporator for the loop heat pipe is characterized by comprising the following steps of:
step one, performing cold isostatic pressing on carbonyl nickel powder to obtain a porous capillary core pressed compact; the porosity of the porous capillary core compact is greater than 70%, and the pore diameter of the porous core compact is not greater than 3 μm;
step two, carrying out contour machining on the porous capillary core pressed compact obtained in the step one to obtain a machined porous capillary core pressed compact;
step three, sintering the processed porous capillary core pressed compact obtained in the step two in a hydrogen atmosphere to obtain a porous capillary core; the sintering temperature is 350-550 ℃; the porous capillary core has a porosity of greater than 55%, and the porous pore size is no greater than 1.5 μm;
step four, taking metal powder with the particle size of 50-150 mu m as a raw material, taking argon as an auxiliary gas, taking a laser beam or a plasma beam as a heat source, depositing a compact shell on the surface of the porous capillary core obtained in the step three in situ, and then processing again according to the characteristic size of the evaporator to obtain the evaporator for the loop heat pipe; the thickness of the compact shell is more than 3mm, the density is more than 99.5%, and the compact shell is metallurgically combined with the porous capillary core.
The invention carries on cold isostatic pressing shaping to carbonyl nickel powder, presses carbonyl nickel powder into porous capillary core pressed compact, and controls the porosity of porous capillary core pressed compact to be larger than 70%, at the same time, guarantees the pore diameter of porous structure in the porous capillary core pressed compact to be not larger than 3 μm, ensures that the target porosity and pore diameter can be obtained after sintering.
The integrated preparation method of the evaporator for the loop heat pipe is characterized in that the porous capillary core pressed compact in the first step is in a rod shape, a box shape or a flat plate shape. The invention is suitable for preparing the porous capillary cores with various shapes into the evaporator for the loop heat pipe.
The integrated preparation method of the evaporator for the loop heat pipe is characterized in that the metal powder in the fourth step is stainless steel, titanium alloy, nickel alloy, copper or copper alloy. According to the invention, the material of the metal powder is controlled, so that the material of the compact shell is controlled, different use requirements are met, and the application range is wide.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the pore structure is controlled in the pressing and sintering processes of the nickel carbonyl powder, so that the optimal preparation process parameters are established, and the porous capillary core with the pore diameter less than or equal to 1.5 mu m and the porosity more than 55% and with high porosity is obtained under the support of a low-temperature sintering technology, so that the balance of the capillary force and the permeability of the evaporator for the loop heat pipe is realized, and the cooling efficiency of the system is effectively improved.
2. The invention is based on the technical idea of in-situ preparation, can prepare the required compact shell on the porous capillary core outer layer with any shape, can customize and process all parameters according to the technical requirements of users, and simultaneously, the forming precision and the processing efficiency can meet the requirements of high-power loop heat pipes such as 5G communication, high-power LEDs and the like on the evaporator.
3. The invention adopts the technical route of preparing the capillary core by cold isostatic pressing technology and preparing the evaporator shell in situ, the capillary core has uniform pore structure and excellent performance, simultaneously thoroughly eliminates the extra resistance caused by the traditional preparation technology, greatly reduces the error of theoretical capillary force and measured value of the evaporator, and provides solid data support for the design of a high-performance loop heat pipe system.
4. The invention processes the capillary core in the pressed compact state, eliminates the surface hole structure damage caused by processing after sintering, simultaneously reduces the dimensional accuracy requirement when the capillary core is assembled with the shell by the technical route of in-situ deposition, and effectively improves the yield of the evaporator on the premise of ensuring the heat exchange efficiency of the evaporator.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a three-dimensional model diagram of an evaporator for loop heat pipe prepared in example 1 of the present invention.
Fig. 2 is an SEM image of a dense shell and porous wick of the loop heat pipe evaporator prepared in example 1 of the present invention.
FIG. 3 is a microscopic topography of a porous wick in a loop heat pipe evaporator prepared in example 1 of the present invention.
Fig. 4 is a three-dimensional model diagram of an evaporator for loop heat pipe prepared in example 2 of the present invention.
Reference numerals illustrate:
1-a porous wick; 2-an internal flow channel; 3-compact shell.
Detailed Description
Example 1
The embodiment comprises the following steps:
step one, performing cold isostatic pressing on carbonyl nickel powder to obtain a porous capillary core pressed compact; the porosity of the porous capillary core compact is 72%, and the pore diameter of the porous is 1.7 μm; the porous capillary core pressed compact is rod-shaped;
step two, carrying out contour machining on the porous capillary core pressed compact obtained in the step one to obtain a machined porous capillary core pressed compact;
step three, sintering the processed porous capillary core pressed compact obtained in the step two in a hydrogen atmosphere to obtain a porous capillary core; the sintering temperature is 350 ℃; the porosity of the porous capillary core is 59%, and the pore diameter of the porous core is 1.2 mu m;
and fourthly, taking 316L stainless steel powder with the particle size of 150 mu m as a raw material, taking argon as an auxiliary gas, taking a laser beam as a heat source, depositing a compact shell on the surface of the porous capillary core obtained in the third step in situ, and then processing again according to the characteristic size of the evaporator to obtain the evaporator for the loop heat pipe.
Through detection, the thickness of the compact shell of the evaporator for the loop heat pipe prepared by the embodiment is 3.5mm, the density is 99.6%, the compact shell is metallurgically combined with the porous capillary core, the comprehensive performance of the evaporator is excellent, and the technical requirement of the high-performance loop heat pipe is met.
Fig. 1 is a three-dimensional model diagram of an evaporator for loop heat pipes, which is prepared in this embodiment, as can be seen from fig. 1, a porous capillary core 1 prepared in this embodiment is rod-shaped and is provided with an internal flow channel 2, and a layer of dense shell 3 is wrapped outside the porous capillary core 1.
Fig. 2 is an SEM image of a dense shell and a porous capillary core of the evaporator for loop heat pipe prepared in this embodiment, and it can be seen from fig. 2 that metallurgical bonding is formed between the dense shell and the porous capillary core, the preservation of the porous structure is completed, and the gap between the evaporator shell and the capillary core is equivalent to the pore size of the capillary core.
Fig. 3 is a microscopic morphology diagram of a porous capillary core in the evaporator for loop heat pipe prepared in this embodiment, and it can be seen from fig. 3 that the pore channels of the porous capillary core are fully developed and the pore diameters are uniform, so that a good-quality channel is provided for the flow of the coolant.
Example 2
The embodiment comprises the following steps:
step one, performing cold isostatic pressing on carbonyl nickel powder to obtain a porous capillary core pressed compact; the porosity of the porous capillary core compact is 75%, and the pore diameter of the porous is 0.7 μm; the porous capillary core pressed compact is box-shaped;
step two, carrying out contour machining on the porous capillary core pressed compact obtained in the step one to obtain a machined porous capillary core pressed compact;
step three, sintering the processed porous capillary core pressed compact obtained in the step two in a hydrogen atmosphere to obtain a porous capillary core; the sintering temperature is 550 ℃; the porosity of the porous capillary core is 56%, and the pore diameter of the porous capillary core is 0.5 mu m;
and step four, taking TC4 titanium alloy powder with the particle size of 50 mu m as a raw material, taking argon as an auxiliary gas, taking a laser beam as a heat source, depositing a compact shell on the surface of the porous capillary core obtained in the step three in situ, and then processing again according to the characteristic size of the evaporator to obtain the evaporator for the loop heat pipe.
Through detection, the thickness of the compact shell of the evaporator for the loop heat pipe prepared by the embodiment is 3.0mm, the density is 99.7%, the compact shell is metallurgically combined with the porous capillary core, the comprehensive performance of the evaporator is excellent, and the technical requirement of the high-performance loop heat pipe is met.
Fig. 4 is a three-dimensional model diagram of an evaporator for loop heat pipes prepared in example 2 of the present invention, and as can be seen from fig. 4, the porous capillary core 1 prepared in this example is flat and provided with an inner flow channel 2, and a dense outer shell 3 is wrapped outside the porous capillary core 1.
Example 3
The embodiment comprises the following steps:
step one, performing cold isostatic pressing on carbonyl nickel powder to obtain a porous capillary core pressed compact; the porosity of the porous capillary core compact is 78%, and the pore diameter of the porous core compact is 1.9 mu m; the porous capillary core pressed compact is in a flat plate shape;
step two, carrying out contour machining on the porous capillary core pressed compact obtained in the step one to obtain a machined porous capillary core pressed compact;
step three, sintering the processed porous capillary core pressed compact obtained in the step two in a hydrogen atmosphere to obtain a porous capillary core; the sintering temperature is 450 ℃; the porosity of the porous capillary core is 57%, and the pore diameter of the porous capillary core is 1.5 mu m; the metal powder is stainless steel, titanium alloy, nickel alloy, copper or copper alloy;
and step four, using Inconel 625 powder with the particle size of 100 mu m as a raw material, using argon as an auxiliary gas, using a plasma beam as a heat source, depositing a compact shell on the surface of the porous capillary core obtained in the step three in situ, and then processing again according to the characteristic size of the evaporator to obtain the evaporator for the loop heat pipe.
Through detection, the thickness of the compact shell of the evaporator for the loop heat pipe prepared by the embodiment is 3.2mm, the density is 99.6%, the compact shell is metallurgically combined with the porous capillary core, the comprehensive performance of the evaporator is excellent, and the technical requirement of the high-performance loop heat pipe is met.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention. Any simple modification, variation and equivalent variation of the above embodiments according to the technical substance of the invention still fall within the scope of the technical solution of the invention.
Claims (2)
1. The integrated preparation method of the evaporator for the loop heat pipe is characterized by comprising the following steps of:
step one, performing cold isostatic pressing on carbonyl nickel powder to obtain a porous capillary core pressed compact; the porosity of the porous capillary core compact is greater than 70%, and the pore diameter of the porous core compact is not greater than 3 μm;
step two, carrying out contour machining on the porous capillary core pressed compact obtained in the step one to obtain a machined porous capillary core pressed compact;
step three, sintering the processed porous capillary core pressed compact obtained in the step two in a hydrogen atmosphere to obtain a porous capillary core; the sintering temperature is 350-550 ℃; the porous capillary core has a porosity of greater than 55%, and the porous pore size is no greater than 1.5 μm;
step four, taking metal powder with the particle size of 50-150 mu m as a raw material, taking argon as an auxiliary gas, taking a laser beam or a plasma beam as a heat source, depositing a compact shell on the surface of the porous capillary core obtained in the step three in situ, and then processing again according to the characteristic size of the evaporator to obtain the evaporator for the loop heat pipe; the metal powder is stainless steel, titanium alloy, nickel alloy, copper or copper alloy; the thickness of the compact shell is larger than 3mm, the density is larger than 99.5%, the compact shell is metallurgically combined with the porous capillary core, the porous capillary core is rod-shaped or plate-shaped, an inner flow passage is formed, and the porous capillary core is externally wrapped with a compact shell.
2. The method for integrally manufacturing an evaporator for loop heat pipes according to claim 1, wherein the porous capillary core compact in the first step is rod-shaped, box-shaped or flat-plate-shaped.
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| CN103182509A (en) * | 2011-12-29 | 2013-07-03 | 北京有色金属研究总院 | Preparation method of porous capillary core for loop heat pipe |
| WO2018129633A1 (en) * | 2017-01-16 | 2018-07-19 | 北京空间飞行器总体设计部 | Preparation method for loop heat pipe evaporator |
| CN108317879A (en) * | 2017-01-16 | 2018-07-24 | 北京空间飞行器总体设计部 | A kind of preparation method of loop heat pipe evaporator |
| CN108662934A (en) * | 2018-06-06 | 2018-10-16 | 安徽工业大学 | A kind of foam metal-fiber composite capillary wick and its processing method applied to loop circuit heat pipe |
| CN110303153A (en) * | 2019-06-28 | 2019-10-08 | 安泰环境工程技术有限公司 | A kind of processing method of capillary wick and its assembly method with shell |
| CN112872359A (en) * | 2021-01-11 | 2021-06-01 | 上海交通大学 | Laser surface cladding metal heat pipe material and preparation method thereof |
| CN113000841A (en) * | 2021-02-24 | 2021-06-22 | 西北有色金属研究院 | Preparation method of porous nickel element with threaded deep hole |
| CN113290248A (en) * | 2021-05-07 | 2021-08-24 | 南京工业大学 | Preparation method of metal capillary core with multilayer structure |
| CN113720186A (en) * | 2021-07-26 | 2021-11-30 | 北京空间飞行器总体设计部 | Loop heat pipe evaporator based on porous silicon nitride capillary core and manufacturing method thereof |
| CN113941704A (en) * | 2021-09-03 | 2022-01-18 | 深圳市华诚达精密工业有限公司 | Electromagnetic induction heating layer and preparation method thereof, and atomization core and preparation method thereof |
| CN113714502A (en) * | 2021-09-08 | 2021-11-30 | 西北有色金属研究院 | Preparation method of tubular porous metal element with micro permeation flux |
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