CN102305564A - Fiber sintering type micro heat pipe and manufacturing method thereof - Google Patents
Fiber sintering type micro heat pipe and manufacturing method thereof Download PDFInfo
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- CN102305564A CN102305564A CN 201110249073 CN201110249073A CN102305564A CN 102305564 A CN102305564 A CN 102305564A CN 201110249073 CN201110249073 CN 201110249073 CN 201110249073 A CN201110249073 A CN 201110249073A CN 102305564 A CN102305564 A CN 102305564A
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Abstract
The invention discloses a fiber sintering type micro heat pipe and a manufacturing method thereof. The fiber sintering type micro heat pipe consists of a base pipe, a liquid suction core and a liquid working medium, wherein the liquid suction core is formed by solid-phase sintering for metal fibers. The manufacturing method for the fiber sintering type micro heat pipe mainly comprises four steps, namely preparation for the base pipe, processing of the metal fibers, manufacturing of the liquid suction core and precise encapsulation for the liquid suction core. After the metal fibers are sintered, metallurgical bonding is realized among the fibers and a large quantity of multi-scale pore structures are formed. The fiber sintering type micro heat pipe manufactured by using the method has the advantages of simple process, low cost, high porosity and controllability of the liquid suction core, high permeability, small liquid reflux resistance, large specific surface area of a metal fiber sintering layer, high capillary force and the like, and a stable three-dimensional meshed porous structure is formed among the fibers, so the fiber sintering type micro heat pipe is difficult to damage.
Description
Technical field
The present invention relates to the micro heat pipe technology of microelectronic, particularly relate to a kind of fiber sintering decline heat pipe and manufacturing approach thereof.
Background technology
Along with the microminiaturization of photoelectron/microelectronic chip and application system thereof and the development trend of high integration thereof, cause fatal problems such as the narrow and small and high heat flux of heat-dissipating space.Traditional be difficult to satisfy through the mode that increases aluminium/copper radiating rib volume, weight and specific area and increase area of dissipation merely further develop requirement from now on; Therefore; Solve small space high heat flux chip thermal control problem, must adopting more, the high efficiency and heat radiation mode replaces conventional Forced Air Convection heat dissipation technology.
Have high thermal conductivity, the good ideal element that isothermal, thermal response are fast, in light weight, simple in structure, micro heat pipe that need not advantages such as additional power driving has become the heat conduction of high heat flux electronic chip.The operation principle of heat pipe is: the liquid working substance carburation by evaporation when an end of heat pipe is heated in the body, steam flow to the other end and emit heat and condense into liquid under small pressure reduction, and liquid relies on the capillary attraction effect of capillary structure to flow back to evaporator section again.So circulation endlessly, heat can be efficiently reaches the other end by an end of body.
The heat transfer property of micro heat pipe depends primarily on liquid sucting core structure in the pipe.Traditional liquid sucting core structure mainly contains plough groove type wick and powder sintered formula wick.
Though traditional powder sintered formula liquid sucting core structure has stronger capillary pressure, the wick porosity is low and can not control, and liquid backflow resistance is big; And liquid sucting core structure is fragile; More fatal is that sinter layer is thicker, and thermal resistance is bigger, the heavy 40%-60% of weight ratio plough groove type.
Advantages such as and that though the heat pipe of smooth plough groove type liquid sucting core structure has is in light weight, and the axial heat conduction ability is big, liquid backflow resistance is little.But its capillary pressure is little, and very high to gash depth and width requirement, directionality is very strong, and when big bending appearred in heat pipe, the adopting heat pipes for heat transfer performance descended significantly, the antigravity poor performance, and its processing technology is complicated.
Summary of the invention
The shortcoming that the objective of the invention is to overcome prior art is with not enough; A kind of fiber sintering decline heat pipe and manufacturing approach thereof are provided; Processing technology of the present invention is simple, and is with low cost, and the wick porosity is high and controlled; Permeability is high; Liquid backflow resistance is little, and metallic fiber sintered layer specific area is big, and capillary force is big; Form stable three-dimensional netted loose structure between the fiber, not fragile.
The present invention realizes through following technical scheme:
A kind of fiber sintering heat pipe that declines comprises parent tube, wick and is filled in the liquid working substance in the wick, said parent tube closed at both ends, and parent tube inside vacuumizes.
Said parent tube is that external diameter is that 5mm～10mm, wall thickness are the metal circular tube of 0.2mm～0.5mm.
Said wick is the circular metallic fiber pipe that fits tightly at the parent tube inwall, and this wick thickness is 0.3mm～0.5mm, and porosity is 65%～90%.
Said parent tube material therefor is any one in red copper, aluminium alloy or the stainless steel.Said metallic fiber pipe is any one in copper fiber, aluminum fiber or the stainless steel fibre.
Said liquid working substance be in pure water, methyl alcohol, ethanol or the acetone any one.
The decline manufacturing approach of heat pipe of above-mentioned fiber sintering comprises the steps:
(1) preparation of parent tube: at first utilize cutting machine one hollow metal tubing to be cut into the short tube of certain-length; Then the one of which end being carried out the draw with pipe-reduction mold handles; Put it into then and clean 1min～5min in the acid polishing slurry; Residual chip in flush away surface and oil contaminant and the metal tube; Remove metal tube remained on surface polishing fluid with flushing with clean water at last, obtain parent tube;
(2) processing of metallic fiber: adopt big cutting edge inclination multitooth tool on lathe, to process the continuous type fiber of different parameters; Utilize shearing equipment that it is cut into the short fiber of certain-length then; And with ultrasonic waves for cleaning 10min～30min, the flush away surface and oil contaminant obtains broken-staple metal fibre;
(3) manufacturing of wick: in parent tube, insert a stainless steel cylindrical mandrel; Plug is in the parent tube center; Plug and parent tube inwall are formed in the annular space; Broken-staple metal fibre after cleaning evenly is filled in plug and the formed annular space of parent tube inwall; Integral body is put into atmosphere protection electrical resistance sintering stove and is carried out high temperature sintering then, and stove to be sintered is extracted the stainless steel cylindrical mandrel out after being cooled to room temperature;
Sintering temperature is 600 ℃～950 ℃, and sintering process adopts temperature-gradient method, heating rate≤5 ℃/min, and the sintering atmosphere is hydrogen, nitrogen or argon shield atmosphere, sintering time is 30min～120min.Connect together through intermolecular diffusion between broken-staple metal fibre and the broken-staple metal fibre and between wick and the parent tube inwall after the sintering.
(4) encapsulation: elder generation does not handle parent tube through the draw an end welded seal; Then in parent tube, pour into certain quantity of fluid working medium from an end of handling through the draw; Then parent tube is vacuumized processing, this end welded seal to handling through the draw at last obtains the fiber sintering heat pipe that declines.Welded seal adopts a kind of in flame welding or the argon arc welding.
The fiber sintering of the present invention heat pipe that declines.The metallic fiber surface has abundant many/minute yardstick surface texture, realizes metallurgical binding between fiber and the fiber and between fiber wick and the parent tube inwall behind the high temperature sintering, has formed a large amount of multiple dimensioned pore structures.The fiber sintering of manufacturing declines, and to have the wick porosity high and controlled for heat pipe, and permeability is high, and liquid backflow resistance is little; The sinter layer specific area is big, and capillary force is big; The good heat transfer mass-transfer performance; Stability Analysis of Structures, not fragile, advantage such as manufacturing process is simple, and is with low cost.
Beneficial effect compared with prior art of the present invention is:
1. the present invention adopts the metallic fiber of multiple tooth cutting method processing to make the micro heat pipe wick; Fiber surface has abundant many/minute yardstick surface texture; Increased between fiber and the fiber; Contact area between fiber wick and the parent tube inwall, significantly improved between the fiber and fiber and parent tube inwall between bond strength.
2. formed a large amount of multiple dimensioned three-dimensional netted loose structures behind the sintering between the fiber; Porosity is high and controlled, and specific area is big, and the wick capillary force is big, permeability is high, liquid backflow resistance is little; Help improving the back-flow velocity of liquid working substance in the heat pipe, thereby improve the heat dispersion of micro heat pipe.
3. the metallic fiber of the present invention's employing adopts cutting method processing, and processing technology is simple, and is with low cost, and the micro-structural of fiber surface helps reducing the sintering temperature in the wick manufacture process simultaneously, shortens sintering time, reduction micro heat pipe manufacturing cost.
Description of drawings
Fig. 1 is the fiber sintering of the present invention forming heat pipe theory structure sketch map that declines;
Fig. 2 is decline heat pipe SEM figure of fiber sintering of the present invention.
The specific embodiment
Following specific embodiments of the invention is done further detailed explanation, but embodiment of the present invention is not limited thereto.
Embodiment
Like Fig. 1, shown in Figure 2; The fiber sintering of the present invention heat pipe that declines comprises parent tube 1, wick 2 and is filled in the liquid working substance in the wick; Liquid working substance be in pure water, methyl alcohol, ethanol or the acetone any one, the inside of said parent tube 1 vacuumizes, two ends are enclosed construction.This parent tube 1 is the metal circular tube of the about 5mm～10mm of external diameter, wall thickness 0.2mm～0.5mm.This wick 2 is for to fit tightly the circular metallic fiber pipe at parent tube 1 inwall, and this wick thickness is about 0.3mm～0.5mm, and porosity is about 65%～90%.The material therefor of this parent tube 1 can be red copper, aluminium alloy or stainless steel.The fiber that this metallic fiber pipe adopts can be copper fiber, aluminum fiber or stainless steel fibre.
The manufacturing approach that above-mentioned fiber sintering declines heat pipe, can realize through following steps:
(1) preparation of parent tube: at first utilize cutting machine one hollow metal tubing to be cut into the short tube of certain-length; Then the one of which end being carried out the draw with pipe-reduction mold handles; Put it into then and clean 1min～5min in the acid polishing slurry; Residual chip in flush away surface and oil contaminant and the metal tube; Remove metal tube remained on surface polishing fluid with flushing with clean water at last, obtain parent tube;
(2) processing of metallic fiber: adopt big cutting edge inclination multitooth tool on lathe, to process the continuous type fiber of different parameters; Fiber surface has many/minute yardstick surface texture; Fiber equivalent diameter 35 μ m-100 μ m; Utilize shearing equipment that it is cut into the short fiber of certain-length then; And with ultrasonic waves for cleaning 10min～30min; The flush away surface and oil contaminant obtains broken-staple metal fibre;
(3) manufacturing of wick: in parent tube, insert a stainless steel cylindrical mandrel; Plug is in the parent tube center; Plug and parent tube inwall are formed in the annular space; Broken-staple metal fibre after cleaning evenly is filled in plug and the formed annular space of parent tube inwall; Integral body is put into atmosphere protection electrical resistance sintering stove and is carried out high temperature sintering then, and stove to be sintered is extracted the stainless steel cylindrical mandrel out after being cooled to room temperature; Sintering temperature is 600 ℃～950 ℃, and sintering process adopts temperature-gradient method, heating rate≤5 ℃/min, and the sintering atmosphere is hydrogen, nitrogen or argon shield atmosphere, sintering time is 30min～120min.Connect together through intermolecular diffusion between broken-staple metal fibre and the broken-staple metal fibre and between wick and the parent tube inwall after the sintering.
(4) encapsulation: elder generation does not handle parent tube through the draw an end welded seal; Then in parent tube, pour into certain quantity of fluid working medium from an end of handling through the draw; Then parent tube is vacuumized processing, this end welded seal to handling through the draw at last obtains the fiber sintering heat pipe that declines.Welded seal adopts a kind of in flame welding or the argon arc welding.
Through above-mentioned manufacturing approach, can obtain the fiber sintering heat pipe that declines.The metallic fiber surface has abundant many/minute yardstick surface texture, realizes metallurgical binding between the fiber and between wick and the parent tube inwall behind the high temperature sintering, has formed a large amount of multiple dimensioned pore structures.The fiber sintering of manufacturing declines, and to have the wick porosity high and controlled for heat pipe, and permeability is high, and liquid backflow resistance is little; The sinter layer specific area is big, and capillary force is big; The good heat transfer mass-transfer performance; Stability Analysis of Structures, not fragile, advantage such as manufacturing process is simple, and is with low cost.
Just can realize the present invention preferably as stated.
The foregoing description is a preferred implementation of the present invention; But embodiment of the present invention is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (9)
1. fiber sintering heat pipe that declines is characterized in that comprising parent tube, wick and is filled in the liquid working substance in the wick, said parent tube closed at both ends, and parent tube inside vacuumizes.
2. the fiber sintering according to claim 1 heat pipe that declines is characterized in that said parent tube is that external diameter is that 5mm～10mm, wall thickness are the metal circular tube of 0.2mm～0.5mm.
3. the fiber sintering according to claim 2 heat pipe that declines is characterized in that said wick is the circular metallic fiber pipe that fits tightly at the parent tube inwall, and this wick thickness is 0.3mm～0.5mm, and porosity is 65%～90%.
4. the fiber sintering according to claim 3 heat pipe that declines is characterized in that said parent tube material therefor is any one in red copper, aluminium alloy or the stainless steel.
5. the fiber sintering according to claim 4 heat pipe that declines is characterized in that said metallic fiber pipe is any one in copper fiber, aluminum fiber or the stainless steel fibre.
6. the fiber sintering according to claim 5 heat pipe that declines, it is characterized in that said liquid working substance be in pure water, methyl alcohol, ethanol or the acetone any one.
7. the decline manufacturing approach of heat pipe of each said fiber sintering in the claim 1～6 is characterized in that comprising the steps:
(1) preparation of parent tube: at first utilize cutting machine one hollow metal tubing to be cut into the short tube of certain-length; Then the one of which end being carried out the draw with pipe-reduction mold handles; Put it into then and clean 1min～5min in the acid polishing slurry; Residual chip in flush away surface and oil contaminant and the metal tube; Remove metal tube remained on surface polishing fluid with flushing with clean water at last, obtain parent tube;
(2) processing of metallic fiber: adopt big cutting edge inclination multitooth tool on lathe, to process the continuous type fiber of different parameters; Utilize shearing equipment that it is cut into the short fiber of certain-length then; And with ultrasonic waves for cleaning 10min～30min, the flush away surface and oil contaminant obtains broken-staple metal fibre;
(3) manufacturing of wick: in parent tube, insert a stainless steel cylindrical mandrel; Plug is positioned at the parent tube center; Make plug and parent tube inwall form annular space; Broken-staple metal fibre after cleaning evenly is filled in plug and the formed annular space of parent tube inwall; Integral body is put into atmosphere protection electrical resistance sintering stove and is carried out high temperature sintering then, and stove to be sintered is extracted the stainless steel cylindrical mandrel out after being cooled to room temperature;
(4) encapsulation: elder generation does not handle parent tube through the draw an end welded seal; Then in parent tube, pour into certain quantity of fluid working medium from an end of handling through the draw; Then parent tube is vacuumized processing, this end welded seal to handling through the draw at last obtains the fiber sintering heat pipe that declines.
8. the decline manufacturing approach of heat pipe of fiber sintering according to claim 7; It is characterized in that said step (3) sintering temperature is 600 ℃～950 ℃; Sintering process adopts temperature-gradient method; Heating rate≤5 ℃/min; The sintering atmosphere is hydrogen, nitrogen or argon shield atmosphere, and sintering time is 30min～120min.
9. the decline manufacturing approach of heat pipe of fiber sintering according to claim 8 is characterized in that said step (4) welded seal adopts a kind of in flame welding or the argon arc welding.
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Application publication date: 20120104 |