CN115194158A - Method for manufacturing powder sintering stainless steel heat pipe by slurry pouring and heat pipe - Google Patents
Method for manufacturing powder sintering stainless steel heat pipe by slurry pouring and heat pipe Download PDFInfo
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- CN115194158A CN115194158A CN202210686468.5A CN202210686468A CN115194158A CN 115194158 A CN115194158 A CN 115194158A CN 202210686468 A CN202210686468 A CN 202210686468A CN 115194158 A CN115194158 A CN 115194158A
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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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
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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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/107—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing organic material comprising solvents, e.g. for slip casting
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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
- 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
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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
- 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
Abstract
The invention provides a method for manufacturing a powder sintering stainless steel heat pipe by adopting slurry pouring and the heat pipe, comprising the following steps: preparing slurry for manufacturing the heat pipe: taking stainless steel powder with the granularity of 120-150 meshes; carrying out surface modification on the stainless steel powder by adopting a silane coupling agent to obtain modified stainless steel powder; dissolving 30-65% of modified stainless steel powder in a mixed solvent of 15-40% of alcohol and 5-15% of toluene to obtain a mixed solution; adding 3-10% of binder, 1-5% of plasticizer and less than 2% of dispersant in the mixing process to obtain slurry; manufacturing a heat pipe: pouring the slurry into a mold and sintering according to a preset rule to obtain a stainless steel heat pipe shell; and (3) mounting a packaging plate at one end of the stainless steel heat pipe shell and mounting an end cover body at the other end of the stainless steel heat pipe shell, injecting the condensate into the inner cavity of the heat pipe, and vacuumizing the inner cavity of the heat pipe to obtain the heat pipe.
Description
Technical Field
The invention relates to the technical field of heat pipe heat dissipation, in particular to a manufacturing method of a powder sintering stainless steel heat pipe adopting slurry pouring and a heat pipe.
Background
The heat pipe transfers heat by means of phase change of working media in the pipe, a large amount of heat can be led out without additional power supply, and the heat pipe is widely concerned and practically applied in the field of temperature control and heat dissipation. The wick structure of the heat pipe affects the working performance, and the wick structure mainly includes four types, namely a groove type wick, a wire mesh type wick, a fiber type wick and a sintering type wick, wherein the powder sintering type wick is most widely applied due to good pore structure and working performance.
The stainless steel material can be suitable for severe environments with high temperature, high pressure, strong radiation and strong corrosivity, such as nuclear power stations, and the current stainless steel heat pipe mainly comprises a gravity type heat pipe and a heat pipe with a groove or wire mesh capillary structure.
However, the stainless steel heat pipe provided by the related technology has poor working performance, uneven texture of the liquid absorption core and unstable performance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a manufacturing method of a powder sintering stainless steel heat pipe adopting slurry pouring and the heat pipe, which can solve the problems of poor working performance, uneven texture of a liquid absorption core and unstable performance of the existing stainless steel heat pipe.
In order to solve the technical problems, the invention provides the following technical scheme:
in one aspect, a method for manufacturing a powder sintered stainless steel heat pipe by slurry filling is provided, the method comprising:
preparing slurry for manufacturing the heat pipe:
taking stainless steel powder with the granularity of 120-150 meshes;
carrying out surface modification on the stainless steel powder by adopting a silane coupling agent to obtain modified stainless steel powder;
dissolving 30-65% of the modified stainless steel powder in a mixed solvent of 15-40% of alcohol and 5-15% of toluene to obtain a mixed solution;
adding 3-10% of binder, 1-5% of plasticizer and less than 2% of dispersant by mass into the mixed solution to obtain the slurry;
manufacturing a heat pipe:
pouring the slurry into a mold and sintering according to a preset rule to obtain a stainless steel heat pipe shell attached with a lotion core;
and mounting a packaging plate at one end of the stainless steel heat pipe shell, mounting an end cover at the other end of the stainless steel heat pipe shell, injecting the condensate into the inner cavity of the heat pipe, and vacuumizing the inner cavity of the heat pipe to obtain the heat pipe.
In an alternative embodiment, the binder is polymethyl methacrylate, the plasticizer is dibutyl phthalate, and the dispersant is polyethylene glycol.
In an optional embodiment, the mass fraction of the polymethyl methacrylate is 2% to 8%, the mass fraction of the dibutyl phthalate is 0.5% to 4%, and the mass fraction of the polyethylene glycol is less than 1.5%.
In an alternative embodiment, the pouring the slurry into the mold to sinter according to a preset rule includes:
sintering the mixture to a first reference temperature according to a preset heating rate, and then preserving heat for a first time;
sintering the mixture to a second reference temperature according to the preset heating rate, and then preserving the heat for a second time;
sintering the mixture to a third reference temperature according to the preset heating rate, and then keeping the temperature for a third time;
sintering according to the preset heating rate to a fourth reference temperature, and then preserving heat for a fourth time;
wherein the first reference temperature, the second reference temperature, the third reference temperature and the fourth reference temperature are sequentially increased according to a gradient.
In an alternative embodiment, the first time period of the heat preservation is one third of the second time period of the heat preservation, the second time period of the heat preservation is the same as the third time period of the heat preservation, and the third time period of the heat preservation is two thirds of the fourth time period of the heat preservation.
In an alternative embodiment, the stainless steel powder is used in an amount of 30-65% by weight.
In an alternative embodiment, the stainless steel powder has a particle size of 120-150 mesh.
In an alternative embodiment, the heat pipe manufacturing step further comprises: before slurry is poured into the mould, carrying out acid washing and alkali washing on the mould, wherein the acid washing solution is a sulfuric acid solution with the volume fraction of 15%;
the alkaline washing solution is a sodium hydroxide solution with the volume fraction of 15%.
In another aspect, there is provided a stainless steel heat pipe manufactured by a slurry-filling type powder sintering method, the heat pipe being manufactured by any one of the above methods, the heat pipe comprising:
the stainless steel heat-pipe shell is provided with a heat-pipe shell,
the stainless steel packaging plate covers the bottom end of the stainless steel heat pipe shell;
the end cover is covered at the top end of the stainless steel heat pipe shell, a closed inner cavity is formed in the stainless steel heat pipe shell, and the inner cavity is pumped into a vacuum system;
the liquid absorption core is attached to the inner side of the stainless steel heat pipe shell;
and the condensate is filled in a vacuum cavity formed by the stainless steel heat pipe shell, the stainless steel packaging plate and the end cover.
In an optional embodiment, the end cap includes an end cap body and an end cap, the end cap body has a filling hole, the end cap body covers the stainless steel heat pipe shell, and the end cap is connected to the end cap body.
The technical scheme of the invention has the following beneficial effects:
according to the method provided by the embodiment of the invention, the stainless steel powder is adopted to sinter and prepare the liquid absorption core, so that the obtained liquid absorption core has more excellent pore structure and working performance, and the slurry filling method is adopted to fill the slurry, so that the fluidity is good, the operation is simple, the texture of the liquid absorption core obtained by sintering is more uniform, and the performance is more stable; the heat pipe made of the stainless steel powder is more excellent in performance than the traditional heat pipe, can work in a severe environment with high temperature, high pressure, strong radiation and strong corrosion conveniently, and solves the heat dissipation problem under severe working conditions.
Drawings
FIG. 1 is a schematic view of the assembly of a stainless steel heat pipe case with slurry poured therein;
FIG. 2 is a schematic view of the assembly of the wick as it is sintered;
FIG. 3 is a schematic representation of the sintering completion of the wick;
FIG. 4 is a schematic view of a stainless steel heat pipe assembly;
fig. 5 is a schematic view of the overall structure of the stainless steel heat pipe.
[ reference numerals ]
1-a stainless steel heat pipe shell, 2-a stainless steel packaging plate, 3-an end cover, 4-a liquid absorption core, 401-slurry, 5-condensate, 301-an end cover body, 302-an end cover cap, 6-a graphite rod, 601-a graphite rod body and 602-a disc-shaped graphite rod cover.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The following describes the guardrail with good warning effect for building construction in detail with reference to the accompanying drawings and specific embodiments. Meanwhile, it is described herein that the following embodiments are the best and preferred embodiments for the purpose of making the embodiments more detailed, and may be implemented in other alternative ways by those skilled in the art; also, the drawings are only for purposes of more particularly describing embodiments and are not intended to limit the invention in any way.
It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the relevant art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
In general, terms may be understood at least in part from the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in the singular or may be used to describe a combination of features, structures, or characteristics in the plural, depending at least in part on the context. Additionally, the term "based on" may be understood as not necessarily intended to convey an exclusive set of factors, but may instead allow for the presence of other factors not necessarily explicitly described, depending at least in part on the context.
It is understood that the meaning of "on 8230; \8230on," \8230, above "and" on 82308230; \823030, above "in the present disclosure should be interpreted in the broadest manner such that" on 8230; \8230above "means not only" directly on "something" but also on "something with the meaning of intervening features or layers therebetween, and" on 8230; \8230on "or" on 8230, above "not only means" on "or" above "something, but also may include the meaning thereof" on "or" above "something with no intervening features or layers therebetween.
Furthermore, spatially relative terms such as "below 823030; below", "lower", "above", "upper" and the like may be used herein for ease of description to describe one element or feature's relationship to another element or feature or features, as illustrated in the figures. Spatially relative terms are intended to encompass different orientations in use or operation of the device in addition to the orientation depicted in the figures. The device may be otherwise oriented and the spatially relative descriptors used herein interpreted accordingly.
The heat pipe transfers heat by means of phase change of working media in the pipe, a large amount of heat can be led out without additional power supply, and the heat pipe is widely concerned and practically applied in the field of temperature control and heat dissipation. The liquid absorption core 4 structure of the heat pipe influences the working performance, the liquid absorption core 4 structure mainly comprises four types, namely a groove type, a silk screen type, a fiber type and a sintering type, wherein the powder sintering type liquid absorption core 4 is most widely applied due to the good pore structure and the working performance.
The stainless steel material can be suitable for high-temperature and high-pressure, strong-radiation and strong-corrosion severe environments such as nuclear power stations and the like, and the current stainless steel heat pipe mainly comprises a gravity type heat pipe and a heat pipe with a groove or a wire mesh capillary structure.
However, the stainless steel heat pipe provided by the related art has poor working performance, the texture of the wick 4 is uneven, and the performance is unstable. In view of this, the embodiment of the present invention provides a method for manufacturing a powder sintered stainless steel heat pipe by slurry filling, which can solve the above technical problems.
A manufacturing method of a powder sintering stainless steel heat pipe adopting slurry pouring, which comprises the following steps:
preparing slurry for manufacturing the heat pipe:
taking stainless steel powder with the granularity of 120-150 meshes;
carrying out surface modification on the stainless steel powder by adopting a silane coupling agent to obtain modified stainless steel powder;
dissolving 30-65% of modified stainless steel powder in a mixed solvent of 15-40% of alcohol and 5-15% of toluene to obtain a mixed solution;
adding 3-10% of binder, 1-5% of plasticizer and less than 2% of dispersant in the mixing process to obtain slurry;
manufacturing a heat pipe:
pouring the slurry 401 into a mold, and sintering according to a preset rule to obtain the stainless steel heat pipe shell 1 attached with the washing liquid core 4;
and (3) mounting a stainless steel packaging plate 2 at one end of a stainless steel heat pipe shell 1 attached with a washing liquid core 4, mounting an end cover 3 at the other end, injecting condensate 5 into the inner cavity of the heat pipe, and vacuumizing the inner cavity of the heat pipe to obtain the heat pipe.
The method provided by the embodiment of the invention at least has the following beneficial effects:
according to the method provided by the embodiment of the invention, the stainless steel powder is adopted to sinter and prepare the liquid absorption core 4, so that the obtained liquid absorption core 4 has a more excellent pore structure and working performance, and the slurry filling method is adopted to fill the slurry, so that the fluidity is good, the operation is simple, the texture of the sintered liquid absorption core 4 is more uniform, and the performance is more stable; the heat pipe made of the stainless steel powder has more excellent performance than the traditional heat pipe, can conveniently work in severe environments with high temperature, high pressure, strong radiation and strong corrosion, and solves the heat dissipation problem under severe working conditions.
The methods provided by the embodiments of the present invention will be further explained and described by alternative embodiments.
The stainless steel powder has a particle size of 120-150 meshes, so that the overall size of the stainless steel powder is kept stable, the formed slurry is stable, and the texture of the liquid absorption core 4 formed by the slurry is more uniform.
And (3) carrying out surface modification on the stainless steel powder by adopting a silane coupling agent to obtain the modified stainless steel powder. Further, KH-550 silane coupling agent is coated on the surface of the stainless steel powder to modify the surface of the stainless steel powder, so that the surface activity, durability and oxidation resistance of the stainless steel powder are enhanced.
Dissolving 30-65% of modified stainless steel powder in a mixed solvent of 15-40% of alcohol and 5-15% of toluene to obtain a mixed solution.
Further, the modified stainless steel powder may be 30%, 35%, 40%, 45%, 47%, 48%, 50%, 55%, 57%, 58%, 59%, 60%, 63%, 65% or the like by mass fraction. The mass fraction of alcohol may be 15%, 20%, 22%, 25%, 26%, 30%, 33%, 34%, 35%, etc. The mass fraction of toluene may be 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc.
In an alternative embodiment, the binder is polymethyl methacrylate, the plasticizer is dibutyl phthalate, and the dispersant is polyethylene glycol.
Adding 3-10% of binder, 1-5% of plasticizer and less than 2% of dispersant in the mixing process to obtain slurry 401.
Further, the binder mass fraction may be 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, etc. The mass fraction of the plasticizer may be 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, etc., and the mass fraction of the dispersant may be 1.5%, 1%, 0.5%, etc.
In an optional embodiment, the mass fraction of the polymethyl methacrylate is 2-8%, the mass fraction of the dibutyl phthalate is 0.5-4%, and the mass fraction of the polyethylene glycol is less than 1.5%.
Further, the mass fraction of polymethyl methacrylate may be 2%, 3%, 4%, 5%, 6%, 7%, 8%, etc. The mass fraction of dibutyl phthalate can be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, etc., and the mass fraction of polyethylene glycol can be 1.5%, 1%, 0.5%, etc.
Manufacturing a heat pipe: and pouring the slurry 401 into a mold, and sintering according to a preset rule to obtain the stainless steel heat pipe shell 1 attached with the washing liquid core 4.
As an example, modified stainless steel powder (50 mass percent) is taken and dissolved in a mixed solvent of alcohol (30 mass percent) and toluene (15 mass percent), polymethyl methacrylate PMMA (3 mass percent) is added in the solvent as a binder, dibutyl phthalate DBP (1 mass percent) is added as a plasticizer, and polyethylene glycol PEG (1 mass percent) is added as a dispersant to prepare the required slurry.
And (3) mounting a stainless steel packaging plate 2 at one end of a stainless steel heat pipe shell 1 attached with a washing liquid core 4, mounting an end cover 3 at the other end, injecting condensate 5 into the inner cavity of the heat pipe, and vacuumizing the inner cavity of the heat pipe to obtain the heat pipe.
In an alternative embodiment, the heat pipe manufacturing step further comprises: carrying out acid washing and alkali washing on the die, wherein the acid washing solution is a sulfuric acid solution with the volume fraction of 15%;
the alkaline washing solution is 15% sodium hydroxide solution by volume fraction.
Further, the stainless steel heat pipe case 1 was prepared: cutting a stainless steel pipe with enough length and no defect into required length, polishing the end face and the inner and outer walls of the stainless steel pipe with 400-mesh and 800-mesh abrasive paper, putting the stainless steel pipe into an acid solution for 10-12min to clean surface rust, putting the stainless steel pipe into an alkaline solution for 10-12min to clean surface oil stain, and then washing the stainless steel pipe with clean water. Further, the stainless steel pipe used was of a specification of 8mm in inside diameter, 10mm in outside diameter and 1000mm in length.
Preparation of the wick 4 (i.e. the slurry provided by the present example): coating a layer of vaseline release agent on the outer side of a graphite rod 6, fixing a stainless steel heat pipe shell 1 on the outer side of an I-shaped graphite rod 6 to enable the stainless steel heat pipe shell 1 and the graphite rod 6 to be coaxial, then pouring slurry into a gap between the stainless steel heat pipe shell 1 and the graphite rod 6 under the action of gravity, placing the stainless steel heat pipe shell 1 filled with the slurry into a sintering furnace to be sintered at the high temperature of 1000-1300 ℃, cooling a test piece to the room temperature along with the furnace after sintering for 3-4 hours, taking out the graphite rod 6, and obtaining the stainless steel heat pipe shell 1 attached with a liquid absorption core 4.
Further, the graphite rod 6 comprises a T-shaped graphite rod body 601 and a disc-shaped graphite rod cover 602, the graphite rod body 601 and the graphite rod cover 602 can be buckled together to form an i-shaped graphite rod 6, the maximum diameter of the graphite rod 6 is equal to the inner diameter of the stainless steel heat pipe shell 1, and the minimum diameter of the graphite rod 6 is adjustable, so that the thickness of the wick 4 can be controlled to be different.
In an alternative embodiment, the slurry is poured into the mold and sintered according to a preset rule, which comprises:
sintering the mixture to a first reference temperature according to a preset heating rate, and then preserving heat for a first time;
sintering the mixture to a second reference temperature according to a preset heating rate, and then preserving heat for a second time;
sintering the mixture to a third reference temperature according to a preset heating rate, and then keeping the temperature for a third time;
sintering the mixture to a fourth reference temperature according to a preset heating rate, and then preserving heat for a fourth time;
wherein the first reference temperature, the second reference temperature, the third reference temperature, and the fourth reference temperature are sequentially increased according to a gradient.
The sintering provided by the embodiment of the invention is subjected to gradient rising type heat preservation according to a preset speed, namely, a first reference temperature, a second reference temperature, a third reference temperature and a fourth reference temperature are sequentially raised according to a gradient; the first time, the second time, the third time and the fourth time of heat preservation are prolonged in sequence. This results in a more uniform texture and more consistent properties of the sintered wick 4.
In an alternative embodiment, the first time of incubation is one third of the second time of incubation, the second time of incubation is the same as the third time of incubation, and the third time of incubation is two thirds of the fourth time of incubation.
As an example, the temperature rise process of high-temperature sintering is: the temperature rise speed is 5-6 ℃/min, the temperature is raised to 200 ℃ in about 5min, the temperature is preserved for 20min to gasify the solvent, then the temperature is raised to 550 ℃, the temperature is preserved for 60min, then the temperature is raised to 900 ℃, the temperature is preserved for 60min, finally the temperature is raised to 1200 ℃, the temperature is preserved for 90min to ensure the porosity and the homogeneity degree of the liquid absorption core 4, and then the sample piece is cooled to the room temperature along with the furnace. It should be noted that the sintering atmosphere of the stainless steel heat pipe provided by the embodiment of the present invention is vacuum sintering, or a protective atmosphere of helium or argon is introduced during the sintering process, so as to prevent the stainless steel heat pipe from being oxidized.
Assembling the heat pipe: welding stainless steel encapsulated plate 2 in the one end of stainless steel heat pipe shell 1, guarantee that the port is sealed tight, weld end cover body 301 in the other end of stainless steel heat pipe shell 1, make fluid (gas and condensate 5) can only pass through notes liquid hole business turn over heat pipe inner chamber, pour into the heat pipe inner chamber into through annotating the liquid hole with appropriate amount of condensate 5, then take out the stainless steel heat pipe inner chamber into vacuum through annotating the liquid hole, then screw up end block 302 on end cover body 301, weld end cover cap 302 and end cover body 301 together finally, accomplish the preparation of heat pipe. Further, the welding method of the end cap 302 and the end cap body 301 is Tungsten Inert Gas (TIG) welding.
In an alternative embodiment, the stainless steel powder is used in an amount of 30-65% by weight.
For example, the stainless steel powder may be 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, etc. by mass.
On the other hand, the embodiment of the invention also provides a stainless steel heat pipe manufactured by adopting a slurry pouring type powder sintering method, the heat pipe is manufactured by adopting any one method, and the heat pipe comprises the following components:
the stainless steel heat-pipe shell 1 is,
the stainless steel packaging plate 2 covers the bottom end of the stainless steel heat pipe shell 1;
the end cover 3 covers the top end of the stainless steel heat pipe shell 1, a closed inner cavity is formed in the stainless steel heat pipe shell 1, and the inner cavity is pumped into a vacuum system;
a liquid absorption core 4 attached to the inner side of the stainless steel heat pipe shell 1;
and the condensate 5 is filled in a vacuum inner cavity formed by the stainless steel heat pipe shell 1, the stainless steel packaging plate 2 and the end cover.
In an alternative embodiment, the end cap includes an end cap body 301 and an end cap 302, the end cap body 301 has a liquid injection hole, the end cap body 301 covers the stainless steel heat pipe case 1, and the end cap 302 is connected to the end cap body 301.
Further, the thickness of the wick 4 is 150-200 μm, the thickness of the wick 4 can be controlled by controlling the diameter of the graphite rod 6, and the porosity of the wick 4 is 40-60%. As an example, the thickness of the wick 4 may be 150 μm, 161 μm, 170 μm, 180 μm, 190 μm, 200 μm, or the like,
while the foregoing is directed to the preferred embodiment of the present invention, it will be appreciated by those skilled in the art that various changes and modifications may be made therein without departing from the principles of the invention as set forth in the appended claims.
Claims (10)
1. A manufacturing method of a powder sintering stainless steel heat pipe adopting slurry filling, which is characterized by comprising the following steps:
preparing slurry for manufacturing the heat pipe:
taking stainless steel powder with the granularity of 120-150 meshes;
carrying out surface modification on the stainless steel powder by adopting a silane coupling agent to obtain modified stainless steel powder;
dissolving 30-65% of the modified stainless steel powder in a mixed solvent of 15-40% of alcohol and 5-15% of toluene to obtain a mixed solution;
adding 3-10% of binder, 1-5% of plasticizer and less than 2% of dispersant by mass into the mixed solution to obtain the slurry;
manufacturing a heat pipe:
pouring the slurry into a mold and sintering according to a preset rule to obtain a stainless steel heat pipe shell attached with a lotion core;
and mounting a packaging plate at one end of the stainless steel heat pipe shell, mounting an end cover at the other end of the stainless steel heat pipe shell, injecting the condensate into the inner cavity of the heat pipe, and vacuumizing the inner cavity of the heat pipe to obtain the heat pipe.
2. The method for manufacturing a powder sintered stainless steel heat pipe by slurry pouring according to claim 1, wherein the binder is polymethyl methacrylate, the plasticizer is dibutyl phthalate, and the dispersant is polyethylene glycol.
3. The method for manufacturing a powder sintered stainless steel heat pipe by slurry pouring according to claim 2, wherein the mass fraction of the polymethyl methacrylate is 2-8%, the mass fraction of the dibutyl phthalate is 0.5-4%, and the mass fraction of the polyethylene glycol is less than 1.5%.
4. The method for manufacturing a powder sintered stainless steel heat pipe filled with slurry as claimed in claim 2, wherein the pouring the slurry into the mold for sintering according to a predetermined rule comprises:
sintering to a first reference temperature according to a preset heating rate, and then preserving heat for a first time;
sintering the mixture to a second reference temperature according to the preset heating rate, and then preserving the heat for a second time;
sintering according to the preset heating rate to a third reference temperature, and then keeping the temperature for a third time;
sintering according to the preset heating rate to a fourth reference temperature, and then preserving heat for a fourth time;
wherein the first reference temperature, the second reference temperature, the third reference temperature and the fourth reference temperature are sequentially increased according to a gradient.
5. The method of claim 4, wherein the first time period of the thermal insulation is one third of the second time period of the thermal insulation, the second time period of the thermal insulation is the same as the third time period of the thermal insulation, and the third time period of the thermal insulation is two thirds of the fourth time period of the thermal insulation.
6. The method of claim 1, wherein the stainless steel powder is used in an amount of 30-65 wt%.
7. The method of claim 1, wherein the stainless steel powder has a particle size of 120-150 mesh.
8. The method of claim 1, wherein the step of manufacturing the heat pipe further comprises: before the slurry is poured into the mould, carrying out acid washing and alkali washing on the mould, wherein the acid washing solution is a sulfuric acid solution with the volume fraction of 15%;
the alkaline washing solution is a sodium hydroxide solution with the volume fraction of 15%.
9. A stainless steel heat pipe manufactured by a slurry-fed powder sintering method, wherein the heat pipe is manufactured by the method according to any one of claims 1 to 8, the heat pipe comprising:
a stainless steel heat pipe shell is arranged on the heat pipe,
the stainless steel packaging plate covers the bottom end of the stainless steel heat pipe shell;
the end cover is covered at the top end of the stainless steel heat pipe shell, a closed inner cavity is formed in the stainless steel heat pipe shell, and the inner cavity is pumped into a vacuum system;
the liquid absorption core is attached to the inner side of the stainless steel heat pipe shell;
and the condensed liquid is filled in a vacuum inner cavity formed by the stainless steel heat pipe shell, the stainless steel packaging plate and the end cover.
10. A stainless steel heat pipe manufactured by the slurry filling type powder sintering method according to claim 9, wherein the end cap includes an end cap body and an end cap cover, the end cap body is provided with a liquid filling hole, the end cap body covers the stainless steel heat pipe shell, and the end cap cover is connected to the end cap body.
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| CN113432467A (en) * | 2021-08-27 | 2021-09-24 | 南京工业大学苏州传感与纳米产业技术研究院 | Preparation method of metal ceramic composite capillary core |
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