CN105296898B - A kind of metallic fiber stephanoporate framework composite phase-change material is heat sink and its manufacture method - Google Patents
A kind of metallic fiber stephanoporate framework composite phase-change material is heat sink and its manufacture method Download PDFInfo
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- CN105296898B CN105296898B CN201510618920.4A CN201510618920A CN105296898B CN 105296898 B CN105296898 B CN 105296898B CN 201510618920 A CN201510618920 A CN 201510618920A CN 105296898 B CN105296898 B CN 105296898B
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Abstract
It is heat sink the invention discloses a kind of metallic fiber stephanoporate framework composite phase-change material, including metallic fiber stephanoporate framework, phase-change material, heat sink matrix, radiating fin, cavity is set in heat sink matrix and top surface is provided with opening；Metallic fiber stephanoporate framework is that be filled in the cavity metallic fiber sintered forms, and its porosity ranges is 75%~98%, and is sintered into one with heat sink matrix；Phase-change material is filled in the hole inside metallic fiber stephanoporate framework by the way of heating in vacuum perfusion, and filling rate is 95%~100%, and radiating fin sealing is arranged at the upper opening of heat sink matrix, and is welded as a whole with heat sink matrix.The invention also discloses the preparation method that a kind of metallic fiber stephanoporate framework composite phase-change material is heat sink.Manufacturing process of the present invention is simple, suitable for batch micro operations, with low cost, be internally embedded metallic fiber stephanoporate framework by phase-change material, enhance the capacity of heat transmission of heat sink phase change material inside.
Description
Technical field
The present invention relates to a kind of phase transition heat sink, more particularly to a kind of metallic fiber stephanoporate framework composite phase-change material is heat sink
And its manufacture method.
Background technology
Due to developing rapidly for integrated technology, electronic chip is increasingly intended to high power density and small size.Therewith
The heat management problems of electronic device are brought to can not be ignored, only by the operating temperature stabilization of electronic device under critical range,
Just can guarantee that the normal of its runnability.But traditional electronic device Active Cooling System causes by force fortune due to system complexity
With high expensive, while service condition complexity causes reliability relatively low, therefore the passive cooling based on energy storage materials of phase change
Mode is increasingly becoming a kind of electronic device temperature control approach of hot topic in recent years.
Paraffin, as a kind of organic phase change material, there is latent heat of phase change latent heat high, solid-liquid volume to become simultaneously by feat of it
Change that small, chemical stability is high and non-corrosiveness these superior hot propertys, early have been considered as the most conjunction for energy storage system
One of suitable material.Using based on energy storage materials of phase change it is heat sink with traditional dependence sensible heat is stored it is heat sink compared with, in management
Temperature control system overall dimensions can significantly be reduced during identical heat.But, large volume scale using or apply to big work(
During rate device, thermal conductivity is low in itself for paraffin（Only 0.1 ~ 0.3W/mK）This inherent shortcoming can cause from thermal source absorb heat
Amount can not be diffused into whole phase-change material in time, and the phase-change material occurred near thermal source part is complete in the enough heats of absorption
When liquefaction, the situation of the phase-change material of remainder still in solid-state, it is impossible to equably utilize phase transformation over time and space
The energy storage capability of material, has a strong impact on the temperature-control performance of phase transition heat sink.
The content of the invention
The purpose of the present invention is to overcome the phase-change material for being currently used for phase transition heat sink（Such as paraffin）The deficiency of thermal conductivity itself,
Propose that a kind of metallic fiber stephanoporate framework composite phase-change material is heat sink and its manufacture method, the composite phase-change is heat sink with thermal conductivity
High, latent heat of phase change is big, good temperature-control performance, manufacturing process simple possible, suitable for batch micro operations the advantages of.
The present invention is achieved through the following technical solutions：
A kind of metallic fiber stephanoporate framework composite phase-change material is heat sink, including metallic fiber stephanoporate framework, phase-change material, heat
Heavy matrix, radiating fin, set cavity and top surface are provided with opening in the heat sink matrix；The metallic fiber stephanoporate framework is to fill out
Fill and formed in metallic fiber sintered in the cavity, its porosity ranges is 75% ~ 98%, and sinters one into heat sink matrix
Body；The phase-change material is filled in the hole inside metallic fiber stephanoporate framework by the way of heating in vacuum perfusion, is filled
Note rate is 95% ~ 100%, and the radiating fin sealing is arranged at the upper opening of heat sink matrix, and is welded as with heat sink matrix
Integrally.
Further, the metallic fiber stephanoporate framework does not fully take up the cavity of the heat sink matrix, the metal
Fiber multihole skeleton top remains with sub-fraction space, and the height in the space of reservation is the 1/15 ~ 1/6 of cavity height.
Further, the phase-change material is organic phase change material, and melting range is 30 ~ 90 DEG C.
Further, a diameter of 50 ~ 400um of metallic fiber used is sintered, length is 15-30mm, can be by multitooth tool
Cutting method, hubbing or fuse method are obtained.
Further, the metallic fiber stephanoporate framework is formed by with the metallic fiber sintered of single diameter value, or by
Formed with some the metallic fiber sintered of different-diameter value.
Further, the material of the metallic fiber stephanoporate framework, heat sink matrix and radiating fin is same heat conduction gold
Category.
Further, the heat-conducting metal is aluminium, aluminium alloy or copper.
The manufacture method that a kind of stephanoporate framework composite phase-change material of metallic fiber as described is heat sink, comprises the following steps：
（1）According to the bone porous porosity of required metallic fiber, the quality of required metallic fiber is measured with balance weighing apparatus；
（2）Heat sink matrix is positioned on lower mould, metallic fiber is filled into the cavity of heat sink matrix in layers, protected
Every layer of metallic fiber random distribution is held, then punch-pin is pressed into the cavity into heat sink matrix, then using bolt by lower mould, heat sink
Matrix and punch-pin are fixed；The plush copper cross section of the punch-pin is consistent with the cross section of the cavity of heat sink matrix, and plush copper is highly equal to
The height in the space that cavity top will retain；
（3）The lower mould, heat sink matrix and the punch-pin that are fixed using bolt are placed in vacuum sintering furnace intensification heating together, are burnt
The vacuum ranges of freezing of a furnace are 0 ~ 0.05Mpa, and programming rate is 5 DEG C/min ~ 10 DEG C/min, and is being heated to 750 DEG C ~ 800 DEG C
Shi Baowen 30-40 minutes, then it is incubated 30min ~ 60min at 850 DEG C ~ 900 DEG C；
（4）After the completion of sintering, water-cooled to room temperature takes out lower mould, heat sink matrix and punch-pin that bolt is fixed, unclamps bolt
Obtain the metallic fiber stephanoporate framework being sintered into one with heat sink matrix；
（5）According to the bone porous pore volume of required metallic fiber, required solid phase change material is measured with balance weighing apparatus
Quality；
（6）By alleged phase-change material paving heap on the metallic fiber stephanoporate framework being sintered into one with heat sink matrix,
Being put into together again in vacuum degasing machine carries out vacuumizing heating perfusion, and holding temperature is set to higher than phase-change material fusing point by 10 ~ 15
DEG C, vacuum is 1000 ~ 1500pa, and soaking time is 90min ~ 120min, then naturally cools to room temperature in holding vacuum, with
Take out afterwards and have been filled with the sintering of solid phase change material and have the bone porous heat sink matrix of metallic fiber；
（7）Last layer low temperature soldering paste, the welding temperature of the low temperature soldering paste are applied in the contact surface of radiating fin and heat sink matrix
It is 120 DEG C ~ 180 DEG C to spend, then radiating fin is placed at the opening of the top of heat sink matrix, is put into soldering furnace and is welded accordingly
Insulation is welded under jointing temp.
The present invention can be applied to the heat of the electronic chip of high heat flux suitable for various sizes and the phase transition heat sink of shape
Management.Manufacturing process of the present invention have manufacturing process simple possible, suitable for batch micro operations, thermal conductivity is high, latent heat of phase change is big, temperature
Control performance it is good, the advantages of.
The present invention has advantages below compared with prior art：
（1）What the three-dimensional network that the metallic fiber stephanoporate framework being sintered into one with heat sink matrix is formed was cross-linked
Loose structure, for the filling of phase-change material provides enough internal void spaces, it is ensured that there is phase transition heat sink enough phase transformations to dive
Heat.Meanwhile, the skeleton that the three-dimensional network that itself there is the metallic fiber of high thermal conductivity to be formed is cross-linked can serve as heat again
The approach of transmission is measured, the efficient thermal conductivity of composite phase-change material is improved, it is low brought so as to overcome phase-change material thermal conductivity
Defect, hence in so that this phase transition heat sink has the comprehensive advantage of latent heat of phase change high and high heat conductance, it is ensured that its thermal control performance；
（2）The various parameters that metallic fiber stephanoporate framework composite phase-change material is heat sink can optimize, such as：Metallic fiber is more
The porosity of hole on framework, the diameter of metallic fiber, the fusing point of phase-change material, so that the performance of phase transition heat sink reaches most preferably；
（3）Metallic fiber stephanoporate framework composite phase-change material is heat sink to be obviously reduced heat in the case of identical heat is controlled
Heavy volume is more compact.
Brief description of the drawings
Fig. 1 is the heat sink structural representation of metallic fiber stephanoporate framework composite phase-change material of the present invention.
When Fig. 2 is the filling metallic fiber in the heat sink manufacturing process of metallic fiber stephanoporate framework composite phase-change material of the present invention
Die assembly schematic diagram.
It is shown in figure：1- radiating fins；2- phase-change materials；3- is heat sink matrix；4- metallic fiber stephanoporate frameworks；5- heat
Source；Mould under 6-；7- bolts；8- punch-pin.
Specific embodiment
For a better understanding of the present invention, specific embodiment of the invention is made further below in conjunction with the accompanying drawings
It is bright, but implementation not limited to this of the invention.
As shown in figure 1, a kind of metallic fiber stephanoporate framework composite phase-change material is heat sink, including metallic fiber stephanoporate framework 4,
Cavity is set in phase-change material 2, heat sink matrix 3, radiating fin 1, the heat sink matrix 3 and top surface is provided with opening；The metal
Fiber multihole skeleton 4 is that be filled in the cavity of heat sink matrix 3 metallic fiber sintered forms, its porosity ranges is 75% ~
98%, and be sintered into one with heat sink matrix 3；The scope of the diameter of sintering metallic fiber used is 50 ~ 400um, and length is 15-
30mm；The phase-change material 2 is filled in the hole inside metallic fiber stephanoporate framework 4 by the way of heating in vacuum perfusion
In, filling rate is 95% ~ 100%；The material of the metallic fiber stephanoporate framework 4, heat sink matrix 3 and radiating fin 1 is same
Metal, such as copper, aluminium or aluminium alloy.In present embodiment, consider the equivalent thermal conductivity of metallic fiber stephanoporate framework 4 and ooze
Saturating rate, the porosity for selecting metallic fiber stephanoporate framework 4 is 95%, and it is the metallic fiber of 150um as sintering to use equivalent diameter
Raw material；In practical application, the equivalent diameter of the metallic fiber that metallic fiber stephanoporate framework is used is variable, it is also possible to by having
Some the metallic fiber sintered of different-diameter value form, can be according to actual conditions using the straight of different porosity and metallic fiber
Footpath is worth.Metallic fiber used is red copper fiber, is processed using multitooth tool cutting method, therefore radiating fin 1 and heat sink base
The material of body 3 is also red copper.As shown in Fig. 2 metallic fiber stephanoporate framework 4 does not fully take up the cavity of the heat sink matrix 3,
Sub-fraction space is remained with above cavity, the height in the space of reservation is the 1/14 of cavity height；In practical application, cavity is protected
The height in the space stayed need to ensure that the space for retaining is more than according to the determination of the packing volume and solid-liquid expansion rate of phase-change material 2
The swell increment of volume after phase-change material 2 liquefies completely.The phase-change material 2 is paraffin, and melting range is 51 ~ 57 DEG C；It is actual
In, the fusing point of phase-change material used 2 is selected according to the critical operating temperatures of thermal source 5, it is ensured that fusing point faces less than thermal source 5
More than 15 DEG C of boundary's operating temperature.The radiating fin 1 is to be molded using stretching integral, and sealing is arranged at the top of heat sink matrix 3
At opening, and it is welded as a whole with heat sink matrix 3, the height of fin, thickness and spacing are variable according to practical situations, also may be used
To use column radiating fin.
Thermal source 5 is arranged at the lower section of heat sink matrix 3 when installing and using for the present embodiment, tight with the bottom surface of heat sink matrix 3
Contact, both contact surfaces scribble heat conductive silica gel, and the thermal source can be central processing unit（CPU）, LED, the high-power hair such as radar
Thermal device, the thermal source 5 of the present embodiment is high power LED device.
The manufacture method that a kind of stephanoporate framework composite phase-change material of metallic fiber as described is heat sink, comprises the following steps：
（1）According to the porosity of required metallic fiber stephanoporate framework 4, the quality of required metallic fiber is measured with balance weighing apparatus；
（2）Heat sink matrix 3 is positioned on lower mould 6, metallic fiber is filled into the cavity of heat sink matrix 3 in layers
It is interior, every layer of metallic fiber random distribution is kept, then punch-pin 8 is pressed into the cavity into heat sink matrix 3, then will using bolt 7
Lower mould 6, heat sink matrix 3 and punch-pin 8 are fixed；The plush copper cross section of the punch-pin 8 and the cross section one of the cavity of heat sink matrix 3
Cause, plush copper is highly equal to the height in the space that cavity top will retain；
（3）The lower mould 6, heat sink matrix 3 and the punch-pin 8 that are fixed using bolt 7 are placed in vacuum sintering furnace and heated up together and is added
Heat, the vacuum ranges of sintering furnace are 0 ~ 0.05Mpa, and programming rate is 5 DEG C/min ~ 10 DEG C/min, and be heated to 750 DEG C ~
30-40 minutes is incubated at 800 DEG C, then 30min ~ 60min is incubated at 850 DEG C ~ 900 DEG C；
（4）After the completion of sintering, water-cooled to room temperature takes out lower mould 6, heat sink matrix 3 and punch-pin 8 that bolt 7 is fixed, unclamps
Bolt 7 obtains the metallic fiber stephanoporate framework 4 being sintered into one with heat sink matrix 3；
（5）According to the pore volume of required metallic fiber stephanoporate framework 4, required solid phase change material 2 is measured with balance weighing apparatus
Quality, the solid phase change material 2 of the present embodiment is paraffin；
（6）The alleged phase-change material 2 for obtaining is spread into heap in the metallic fiber stephanoporate framework 4 being sintered into one with heat sink matrix 3
On, then be put into together in vacuum degasing machine and carry out vacuumizing heating perfusion, holding temperature is set to 70 DEG C, than phase-change material fusing point
High 10 ~ 15 DEG C, vacuum is 1000 ~ 1500pa, and soaking time is 90min ~ 120min, is then keeping vacuum to naturally cool to
Room temperature, the sintering that subsequent taking-up has been filled with solid phase change material 2 has the heat sink matrix 3 of metallic fiber stephanoporate framework 4；
（7）Last layer low temperature soldering paste, the welding of the low temperature soldering paste are applied in the contact surface of radiating fin 1 and heat sink matrix 3
Temperature is 120 DEG C ~ 180 DEG C, then radiating fin 1 is placed at the opening of the top of heat sink matrix 3, is put into soldering furnace corresponding
Welding temperature under be incubated and welded.
The manufacture method, can be sprayed using stainless steel or 45# steel as the raw material of mould on the surface of punch-pin 8
One layer of releasing agent of high temperature resistance is applied, to reduce the withdrawal force when extracted of punch-pin 8, it is to avoid metallic fiber stephanoporate framework 4 is broken
It is bad.
It is as implied above that the present invention can be better realized.
The above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not to the present invention
Implementation method restriction.For those of ordinary skill in the field, can also make on the basis of the above description
The change or variation of other multi-forms.There is no need and unable to be exhaustive to all of implementation method.It is all of the invention
Any modification, equivalent and improvement made within spirit and principle etc., should be included in the protection of the claims in the present invention
Within the scope of.
Claims (1)
1. a kind of heat sink manufacture method of metallic fiber stephanoporate framework composite phase-change material, the metallic fiber stephanoporate framework is combined
Phase-change material is heat sink including metallic fiber stephanoporate framework（4）, phase-change material（2）, heat sink matrix（3）, radiating fin（1）, it is described
Heat sink matrix（3）Inside set cavity and top surface is provided with opening；The metallic fiber stephanoporate framework（4）To be filled in the cavity
It is metallic fiber sintered form, its porosity ranges be 75% ~ 98%, and with heat sink matrix（3）It is sintered into one；The phase transformation material
Material（2）Using heating in vacuum perfusion by the way of be filled in the hole inside metallic fiber stephanoporate framework, filling rate be 95% ~
100%, the radiating fin（1）Sealing is arranged at heat sink matrix（3）Upper opening at, and with heat sink matrix（3）It is welded as one
Body；
The metallic fiber stephanoporate framework（4）The heat sink matrix is not fully taken up（3）Cavity, the metallic fiber is porous
Skeleton（4）Top remains with sub-fraction space, and the height in the space of reservation is the 1/15 ~ 1/6 of cavity height；
The phase-change material（2）It is organic phase change material, melting range is 30 ~ 90 DEG C；
A diameter of 50 ~ 400um of sintering metallic fiber used, length is 15-30mm；
The metallic fiber stephanoporate framework（4）Formed by with the metallic fiber sintered of single diameter value, or by with it is some not
Metallic fiber sintered with diameter value forms；
The metallic fiber stephanoporate framework（4）, heat sink matrix（3）And radiating fin（1）Material be same heat-conducting metal；Institute
Heat-conducting metal is stated for aluminium, aluminium alloy or copper；
Comprise the following steps：
（1）According to required metallic fiber stephanoporate framework（4）Porosity, the quality of required metallic fiber is measured with balance weighing apparatus；
（2）By heat sink matrix（3）It is positioned over lower mould（6）On, metallic fiber is filled into heat sink matrix in layers（3）Cavity
It is interior, keep every layer of metallic fiber random distribution, then by punch-pin（8）Press into heat sink matrix（3）Cavity, then use bolt
（7）By lower mould（6）, heat sink matrix（3）And punch-pin（8）It is fixed；The punch-pin（8）Plush copper cross section and heat sink matrix（3）'s
The cross section of cavity is consistent, and plush copper is highly equal to the height in the space that cavity top will retain；
（3）Will be using bolt（7）The lower mould for fixing（6）, heat sink matrix（3）And punch-pin（8）Vacuum sintering furnace liter is placed in together
Temperature heating, the vacuum ranges of sintering furnace are 0 ~ 0.05Mpa, and programming rate is 5 DEG C/min ~ 10 DEG C/min, and is being heated to 750
DEG C ~ 800 DEG C when be incubated 30-40 minute, then 850 DEG C ~ 900 DEG C insulation 30min ~ 60min；
（4）After the completion of sintering, water-cooled to room temperature takes out bolt（7）The lower mould for fixing（6）, heat sink matrix（3）And punch-pin（8）,
Unclamp bolt（7）Obtain and heat sink matrix（3）The metallic fiber stephanoporate framework being sintered into one（4）；
（5）According to required metallic fiber stephanoporate framework（4）Pore volume, measure required solid phase change material with balance weighing apparatus（2）
Quality；
（6）By the alleged phase-change material for obtaining（2）Paving heap in heat sink matrix（3）The metallic fiber stephanoporate framework being sintered into one
（4）On, then be put into together in vacuum degasing machine and carry out vacuumizing heating perfusion, holding temperature is set to higher than phase-change material fusing point
10 ~ 15 DEG C, vacuum is 1000 ~ 1500pa, and soaking time is 90min ~ 120min, is then keeping vacuum to naturally cool to room
Temperature, then takes out and has been filled with solid phase change material（2）Sintering have metallic fiber stephanoporate framework（4）Heat sink matrix（3）；
（7）In radiating fin（1）With heat sink matrix（3）Contact surface apply last layer low temperature soldering paste, the welding of the low temperature soldering paste
Temperature is 120 DEG C ~ 180 DEG C, then by radiating fin（1）It is placed in heat sink matrix（3）Top opening at, be put into soldering furnace
It is incubated under corresponding welding temperature and is welded.
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| CN106497519B (en) * | 2016-09-30 | 2019-04-30 | 中国科学院深圳先进技术研究院 | A kind of producing device of heat conduction with phase change piece and production method, porous aluminas skeleton |
| CN106868432B (en) * | 2016-12-05 | 2018-07-10 | 上海阿莱德实业股份有限公司 | Gallium alloy heat sink material and its production technology equipped with fiber reinforcement |
| CN106931382B (en) * | 2017-03-29 | 2023-03-21 | 华南理工大学 | Heat dissipation element for LED car lamp and preparation method thereof |
| CN111609387A (en) * | 2019-02-26 | 2020-09-01 | 中国科学院理化技术研究所 | Illuminator cooling device and method |
| CN111836505A (en) * | 2019-04-15 | 2020-10-27 | 辰展股份有限公司 | Thermal phase change heat storage module |
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| CN101644549A (en) * | 2009-07-28 | 2010-02-10 | 华南理工大学 | Compound porous structure of micro groove and fiber and preparation method thereof |
| CN103712192A (en) * | 2014-01-08 | 2014-04-09 | 武汉阳光佰鸿新能源股份有限公司 | Integrated phase-changing heat-sink high-power LED lamp radiator |
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| CN205062152U (en) * | 2015-09-23 | 2016-03-02 | 华南理工大学 | Compound phase change material is heat sink for porous skeleton of lurex |
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| CN101644549A (en) * | 2009-07-28 | 2010-02-10 | 华南理工大学 | Compound porous structure of micro groove and fiber and preparation method thereof |
| CN103712192A (en) * | 2014-01-08 | 2014-04-09 | 武汉阳光佰鸿新能源股份有限公司 | Integrated phase-changing heat-sink high-power LED lamp radiator |
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