CN105296898A - Composite phase change material heat sink of metal fiber porous skeleton and manufacturing method thereof - Google Patents
Composite phase change material heat sink of metal fiber porous skeleton and manufacturing method thereof Download PDFInfo
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- CN105296898A CN105296898A CN201510618920.4A CN201510618920A CN105296898A CN 105296898 A CN105296898 A CN 105296898A CN 201510618920 A CN201510618920 A CN 201510618920A CN 105296898 A CN105296898 A CN 105296898A
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Abstract
The invention discloses a composite phase change material heat sink of a metal fiber porous skeleton. The heat sink comprises a metal fiber porous skeleton, a phase change material, a heat sink basal body and a cooling fin, wherein a cavity is formed in the heat sink basal body; an opening is formed in the top surface of the heat sink basal body; the metal fiber porous skeleton is sintered by metal fibers filled in the cavity; the porosity range is 75-98%; the metal fiber porous skeleton and the heat sink basal body are sintered as a whole; the phase change material is filled in holes in the metal fiber porous skeleton by a vacuum heating filling mode; the filling rate is 95-100%; and the cooling fin is sealed in an upper opening of the heat sink basal body, and is welded with the heat sink basal body as a whole. The invention further discloses a preparation method of the composite phase change material heat sink of the metal fiber porous skeleton. The heat sink is simple in manufacturing process, suitable for large-batch manufacturing and low in cost; and the metal fiber porous skeleton is embedded in the phase change material, so that the heat conducting capacity of the phase change material in the heat sink is enhanced.
Description
Technical field
The present invention relates to a kind of phase transition heat sink, particularly relate to the heat sink and manufacture method of a kind of steel fiber stephanoporate framework composite phase-change material.
Background technology
Due to the develop rapidly of integrated technology, electronic chip more and more trends towards high power density and small size.Bring the heat management problems of electron device can not be ignored thereupon, only have and the working temperature of electron device is stabilized under critical range, its operating performance of guarantee normal.But traditional electron device Active Cooling System due to system complexity cause by force use high expensive, simultaneously operational conditions complexity causes reliability relatively low, and the passive type of cooling therefore based on energy storage materials of phase change to become a kind of electron device temperature control approach of hot topic in recent years gradually.
Paraffin, as a kind of organic phase change material, by feat of it, there is high latent heat of phase change latent heat simultaneously, solid-liquid volume change is little, chemical stability is high and these superior thermal characteristicss of non-corrosiveness, be considered to one of the most suitable material for energy storage system already.Adopting heat sink heat sink the comparing with the storage of traditional dependence sensible heat based on energy storage materials of phase change, temperature control system overall dimensions can be reduced significantly when managing identical heat.But, in the use of large volume scale or when applying to high power device, this inherent defect of the own thermal conductivity of paraffin low (only having 0.1 ~ 0.3W/mK) can cause the heat absorbed from thermal source can not be diffused in time whole phase change material, occur that the phase change material of close source part is when absorbing enough heats and completing liquefaction, the phase change material of rest part is still in solid-state situation, the energy storage capability of phase change material can not be utilized over time and space equably, have a strong impact on the temperature-control performance of phase transition heat sink.
Summary of the invention
The object of the invention is the deficiency overcoming the existing phase change material for phase transition heat sink (as paraffin) thermal conductivity own, propose the heat sink and manufacture method of a kind of steel fiber stephanoporate framework composite phase-change material, this composite phase-change is heat sink has that thermal conductivity is high, latent heat of phase change large, good temperature-control performance, manufacturing process simple possible, be applicable to the advantages such as batch micro operations.
The present invention is achieved through the following technical solutions:
A kind of steel fiber stephanoporate framework composite phase-change material is heat sink, comprises steel fiber stephanoporate framework, phase change material, heat sink matrix, radiating fin, establishes cavity and end face is provided with opening in described heat sink matrix; Described steel fiber stephanoporate framework is that be filled in described cavity metallic fiber sintered forms, and its porosity ranges is 75% ~ 98%, and is sintered into one with heat sink matrix; Described phase change material adopts the mode of heating under vacuum perfusion to be filled in the hole of steel fiber stephanoporate framework inside, and filling rate is 95% ~ 100%, and described radiating fin sealing is arranged at the upper opening place of heat sink matrix, and is welded as a whole with heat sink matrix.
Further, described steel fiber stephanoporate framework does not occupy the cavity of described heat sink matrix completely, remains with sub-fraction space above described steel fiber stephanoporate framework, and the height in the space of reservation is 1/15 ~ 1/6 of cavity height.
Further, described phase change material is organic phase change material, and melting range is 30 ~ 90 DEG C.
Further, the diameter sintering steel fiber used is 50 ~ 400um, and length is 15-30mm, can be obtained by multitooth tool cutting system, hubbing or fuse method.
Further, described steel fiber stephanoporate framework forms by having the metallic fiber sintered of single diameter value, or forms by having some the metallic fiber sintered of different diameter value.
Further, the material of described steel fiber stephanoporate framework, heat sink matrix and radiating fin is same heat-conducting metal.
Further, described heat-conducting metal is aluminium, aluminium alloy or copper.
As described in the heat sink manufacture method of steel fiber stephanoporate framework composite phase-change material, comprise the following steps:
(1) according to the bone porous porosity of required steel fiber, the quality of required steel fiber is measured with balance weighing apparatus;
(2) heat sink matrix is positioned on counterdie, steel fiber is filled into from level to level in the cavity of heat sink matrix, keep the steel fiber stochastic distribution of every layer, then punch pressing is entered the cavity of heat sink matrix, then use bolt counterdie, heat sink matrix and punch to be fixed; The plush copper cross section of described punch is consistent with the cross section of the cavity of heat sink matrix, and plush copper height equals cavity top by the height in the space of reservation;
(3) counterdie adopting bolt to fix, heat sink matrix are placed in vacuum sintering furnace intensification heating together with punch, the vacuum ranges of sintering oven is 0 ~ 0.05Mpa, heat-up rate is 5 DEG C/min ~ 10 DEG C/min, and be incubated 30-40 minute when being heated to 750 DEG C ~ 800 DEG C, then at 850 DEG C ~ 900 DEG C insulation 30min ~ 60min;
(4), after having sintered, water-cooled, to room temperature, is taken out counterdie, heat sink matrix and punch that bolt fixes, is unclamped the steel fiber stephanoporate framework that bolt obtains being sintered into one with heat sink matrix;
(5) according to the bone porous volume of voids of required steel fiber, the quality of required solid phase change material is measured with balance weighing apparatus;
(6) alleged phase change material paving is piled on the steel fiber stephanoporate framework be sintered into one with heat sink matrix, put into vacuum defoamation machine more together to carry out vacuumizing heating perfusion, holding temperature is set to higher than phase change material fusing point 10 ~ 15 DEG C, vacuum tightness is 1000 ~ 1500pa, soaking time is 90min ~ 120min, naturally cool to room temperature in maintenance vacuum subsequently, taking out the sintering being filled with solid phase change material subsequently has the bone porous heat sink matrix of steel fiber;
(7) last layer eutectic welding cream is coated with at the contact surface of radiating fin and heat sink matrix, the welding temperature of described low temperature soldering paste is 120 DEG C ~ 180 DEG C, again radiating fin is placed in the opening part of the top of heat sink matrix, puts into soldering furnace and be incubated under corresponding welding temperature and weld.
The present invention is applicable to the phase transition heat sink of various size and shape, can be applicable to the heat management of the electronic chip of high heat flux.Manufacturing process of the present invention has manufacturing process simple possible, is applicable to batch micro operations, thermal conductivity is high, latent heat of phase change is large, good temperature-control performance, etc. advantage.
The present invention compared with prior art has the following advantages:
(1) vesicular structure that the three-dimensional network that the steel fiber stephanoporate framework be sintered into one with heat sink matrix is formed is cross-linked, the filling for phase change material provides enough internal void spaces, ensures that phase transition heat sink has enough latent heats of phase change.Simultaneously, the skeleton that the three-dimensional network that the steel fiber itself with high thermal conductivity is formed is cross-linked can serve as again the approach that heat transmits, improve the efficient thermal conductivity of composite phase-change material, thus overcome low the brought defect of phase change material thermal conductivity, therefore make this phase transition heat sink have the comprehensive advantage of high latent heat of phase change and high heat conductance, ensure that its thermal control performance;
(2) the various parameters that steel fiber stephanoporate framework composite phase-change material is heat sink can be optimized, as: the bone porous porosity of steel fiber, the diameter of steel fiber, the fusing point of phase change material, reach best to make the performance of phase transition heat sink;
(3) steel fiber stephanoporate framework composite phase-change material is heat sink can obviously reduce heat sink volume when controlling identical heat, more compact.
Accompanying drawing explanation
Fig. 1 is the heat sink structural representation of steel fiber stephanoporate framework composite phase-change material of the present invention.
Die assembly schematic diagram when Fig. 2 is the filler metal fiber in the heat sink manufacturing process of steel fiber stephanoporate framework composite phase-change material of the present invention.
Shown in figure be: 1-radiating fin; 2-phase change material; 3-is heat sink matrix; 4-steel fiber stephanoporate framework; 5-thermal source; 6-counterdie; 7-bolt; 8-punch.
Embodiment
In order to understand the present invention better, below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described, but implementation method of the present invention is not limited thereto.
As shown in Figure 1, a kind of steel fiber stephanoporate framework composite phase-change material is heat sink, comprises steel fiber stephanoporate framework 4, phase change material 2, heat sink matrix 3, radiating fin 1, establishes cavity and end face is provided with opening in described heat sink matrix 3; Described steel fiber stephanoporate framework 4 forms for be filled in the cavity of heat sink matrix 3 metallic fiber sintered, and its porosity ranges is 75% ~ 98%, and is sintered into one with heat sink matrix 3; The scope sintering the diameter of steel fiber used is 50 ~ 400um, and length is 15-30mm; The mode that described phase change material 2 adopts heating under vacuum to pour into is filled in the hole of steel fiber stephanoporate framework 4 inside, and filling rate is 95% ~ 100%; The material of described steel fiber stephanoporate framework 4, heat sink matrix 3 and radiating fin 1 is same metal, as copper, aluminium or aluminium alloy.In present embodiment, consider equivalent thermal conductivity and the rate of permeation of steel fiber stephanoporate framework 4, the porosity of selected steel fiber stephanoporate framework 4 is 95%, adopts equivalent diameter to be that the steel fiber of 150um is as sintering starting material; In practical application, the equivalent diameter of the steel fiber that steel fiber stephanoporate framework adopts is variable, also can form by having some the metallic fiber sintered of different diameter value, can adopt different porositys and the diameter value of steel fiber according to practical situation.Steel fiber used is red copper fiber, and adopt multitooth tool cutting system to process, therefore the material of radiating fin 1 and heat sink matrix 3 is also red copper.As shown in Figure 2, steel fiber stephanoporate framework 4 does not occupy the cavity of described heat sink matrix 3 completely, remains with sub-fraction space above cavity, and the height in the space of reservation is 1/14 of cavity height; In practical application, the height in the space that cavity retains is determined according to the packing volume of phase change material 2 and solid-liquid rate of expansion, need ensure that the space retained is more than or equal to the swell increment of the complete post liquefaction volume of phase change material 2.Described phase change material 2 is paraffin, and melting range is 51 ~ 57 DEG C; In practical application, the fusing point of phase change material 2 used is selected according to the critical operating temperatures of thermal source 5, guarantees the critical operating temperatures more than 15 DEG C of fusing point lower than thermal source 5.Described radiating fin 1 is for adopting stretching integral shaping, and sealing is arranged at the upper opening place of heat sink matrix 3, and is welded as a whole with heat sink matrix 3, and the height of fin, thickness and spacing are variable according to practical situations, also can adopt column radiating fin.
The present embodiment is when installing and using, thermal source 5 is arranged at the below of heat sink matrix 3, with heat sink matrix 3 bottom surface close contact, both scribble heat conductive silica gel by contact surface, described thermal source can be the high-power heater members such as central processing unit (CPU), LED, radar, and the described thermal source 5 of the present embodiment is high power LED device.
As described in the heat sink manufacture method of steel fiber stephanoporate framework composite phase-change material, comprise the following steps:
(1) according to the porosity of required steel fiber stephanoporate framework 4, the quality of required steel fiber is measured with balance weighing apparatus;
(2) heat sink matrix 3 is positioned on counterdie 6, steel fiber is filled into from level to level in the cavity of heat sink matrix 3, keep the steel fiber stochastic distribution of every layer, then the cavity of heat sink matrix 3 is entered in punch 8 pressing, then use bolt 7 counterdie 6, heat sink matrix 3 and punch 8 to be fixed; The plush copper cross section of described punch 8 is consistent with the cross section of the cavity of heat sink matrix 3, and plush copper height equals cavity top by the height in the space of reservation;
(3) counterdie 6 adopting bolt 7 to fix, heat sink matrix 3 are placed in vacuum sintering furnace intensification heating together with punch 8, the vacuum ranges of sintering oven is 0 ~ 0.05Mpa, heat-up rate is 5 DEG C/min ~ 10 DEG C/min, and be incubated 30-40 minute when being heated to 750 DEG C ~ 800 DEG C, then at 850 DEG C ~ 900 DEG C insulation 30min ~ 60min;
(4), after having sintered, water-cooled, to room temperature, is taken out counterdie 6, heat sink matrix 3 and punch 8 that bolt 7 fixes, is unclamped the steel fiber stephanoporate framework 4 that bolt 7 obtains being sintered into one with heat sink matrix 3;
(5) according to the volume of voids of required steel fiber stephanoporate framework 4, measure the quality of required solid phase change material 2 with balance weighing apparatus, the solid phase change material 2 of the present embodiment is paraffin;
(6) alleged phase change material 2 is spread pile on the steel fiber stephanoporate framework 4 be sintered into one with heat sink matrix 3, put into vacuum defoamation machine more together to carry out vacuumizing heating perfusion, holding temperature is set to 70 DEG C, higher than phase change material fusing point 10 ~ 15 DEG C, vacuum tightness is 1000 ~ 1500pa, soaking time is 90min ~ 120min, naturally cool to room temperature in maintenance vacuum subsequently, take out the heat sink matrix 3 that the sintering being filled with solid phase change material 2 has steel fiber stephanoporate framework 4 subsequently;
(7) last layer eutectic welding cream is coated with at the contact surface of radiating fin 1 and heat sink matrix 3, the welding temperature of described low temperature soldering paste is 120 DEG C ~ 180 DEG C, again radiating fin 1 is placed in the opening part of the top of heat sink matrix 3, puts into soldering furnace and be incubated under corresponding welding temperature and weld.
Described manufacture method, can adopting stainless steel or 45# steel as the starting material of mould, can, at the releasing agent of surface spraying one deck high temperature resistance of punch 8, to reduce the withdrawal force of punch 8 when extracting, avoiding steel fiber stephanoporate framework 4 to be destroyed.
As implied abovely just can realize the present invention preferably.
The above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.All any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection domain that all should be included in the claims in the present invention.
Claims (8)
1. a steel fiber stephanoporate framework composite phase-change material is heat sink, it is characterized in that, comprise steel fiber stephanoporate framework (4), phase change material (2), heat sink matrix (3), radiating fin (1), establish cavity in described heat sink matrix (3) and end face is provided with opening; Described steel fiber stephanoporate framework (4) forms for be filled in described cavity metallic fiber sintered, and its porosity ranges is 75% ~ 98%, and is sintered into one with heat sink matrix (3); Described phase change material (2) adopts the mode of heating under vacuum perfusion to be filled in the hole of steel fiber stephanoporate framework inside, filling rate is 95% ~ 100%, described radiating fin (1) sealing is arranged at the upper opening place of heat sink matrix (3), and is welded as a whole with heat sink matrix (3).
2. steel fiber stephanoporate framework composite phase-change material is heat sink according to claim 1, it is characterized in that: described steel fiber stephanoporate framework (4) does not occupy the cavity of described heat sink matrix (3) completely, described steel fiber stephanoporate framework (4) top remains with sub-fraction space, and the height in the space of reservation is 1/15 ~ 1/6 of cavity height.
3. steel fiber stephanoporate framework composite phase-change material is heat sink according to claim 1, it is characterized in that: described phase change material (2) is organic phase change material, and melting range is 30 ~ 90 DEG C.
4. steel fiber stephanoporate framework composite phase-change material is heat sink according to claim 1, it is characterized in that: the diameter sintering steel fiber used is 50 ~ 400um, and length is 15-30mm.
5. steel fiber stephanoporate framework composite phase-change material is heat sink according to claim 1, it is characterized in that: described steel fiber stephanoporate framework (4) forms by having the metallic fiber sintered of single diameter value, or form by having some the metallic fiber sintered of different diameter value.
6. steel fiber stephanoporate framework composite phase-change material is heat sink according to claim 1, it is characterized in that: the material of described steel fiber stephanoporate framework (4), heat sink matrix (3) and radiating fin (1) is same heat-conducting metal.
7. steel fiber stephanoporate framework composite phase-change material is heat sink according to claim 6, it is characterized in that: described heat-conducting metal is aluminium, aluminium alloy or copper.
8., as the manufacture method that steel fiber stephanoporate framework composite phase-change material according to any one of power 1 to 7 is heat sink, comprise the following steps:
(1) according to the porosity of required steel fiber stephanoporate framework (4), the quality of required steel fiber is measured with balance weighing apparatus;
(2) heat sink matrix (3) is positioned on counterdie (6), steel fiber is filled into from level to level in the cavity of heat sink matrix (3), keep the steel fiber stochastic distribution of every layer, again punch (8) pressing is entered the cavity of heat sink matrix (3), then use bolt (7) that counterdie (6), heat sink matrix (3) and punch (8) is fixing; The plush copper cross section of described punch (8) is consistent with the cross section of the cavity of heat sink matrix (3), and plush copper height equals cavity top by the height in the space of reservation;
(3) counterdie (6) adopting bolt (7) to fix, heat sink matrix (3) and punch (8) are placed in together vacuum sintering furnace intensification heating, the vacuum ranges of sintering oven is 0 ~ 0.05Mpa, heat-up rate is 5 DEG C/min ~ 10 DEG C/min, and be incubated 30-40 minute when being heated to 750 DEG C ~ 800 DEG C, then at 850 DEG C ~ 900 DEG C insulation 30min ~ 60min;
(4) after having sintered, water-cooled, to room temperature, is taken out counterdie 6, heat sink matrix (3) and punch (8) that bolt 7 fixes, is unclamped the steel fiber stephanoporate framework 4 that bolt (7) obtains being sintered into one with heat sink matrix (3));
(5) according to the volume of voids of required steel fiber stephanoporate framework (4), the quality of required solid phase change material (2) is measured with balance weighing apparatus;
(6) alleged phase change material (2) paving is piled on the steel fiber stephanoporate framework (4) be sintered into one with heat sink matrix (3), put into vacuum defoamation machine more together to carry out vacuumizing heating perfusion, holding temperature is set to higher than phase change material fusing point 10 ~ 15 DEG C, vacuum tightness is 1000 ~ 1500pa, soaking time is 90min ~ 120min, naturally cool to room temperature in maintenance vacuum subsequently, take out the heat sink matrix (3) that the sintering being filled with solid phase change material (2) has steel fiber stephanoporate framework (4) subsequently;
(7) last layer eutectic welding cream is coated with at the contact surface of radiating fin (1) and heat sink matrix (3), the welding temperature of described low temperature soldering paste is 120 DEG C ~ 180 DEG C, again radiating fin (1) is placed in the opening part of the top of heat sink matrix (3), puts into soldering furnace and be incubated under corresponding welding temperature and weld.
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| CN106868432A (en) * | 2016-12-05 | 2017-06-20 | 上海阿莱德实业股份有限公司 | It is provided with the gallium alloy heat sink material and its production technology of fiber reinforcement |
| CN106931382A (en) * | 2017-03-29 | 2017-07-07 | 华南理工大学 | A kind of 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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