US20080301941A1 - Method of manufacturing a cold plate heat exchanger assembly having a metallic compliant gasket - Google Patents
Method of manufacturing a cold plate heat exchanger assembly having a metallic compliant gasket Download PDFInfo
- Publication number
- US20080301941A1 US20080301941A1 US11/810,662 US81066207A US2008301941A1 US 20080301941 A1 US20080301941 A1 US 20080301941A1 US 81066207 A US81066207 A US 81066207A US 2008301941 A1 US2008301941 A1 US 2008301941A1
- Authority
- US
- United States
- Prior art keywords
- micro
- base plate
- manifold
- channels
- manufacturing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000003754 machining Methods 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 239000013618 particulate matter Substances 0.000 claims description 8
- 239000000443 aerosol Substances 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims 2
- 239000002826 coolant Substances 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 13
- 239000002184 metal Substances 0.000 abstract description 12
- 229910052751 metal Inorganic materials 0.000 abstract description 12
- 239000006227 byproduct Substances 0.000 abstract description 4
- 230000037361 pathway Effects 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 11
- 239000007788 liquid Substances 0.000 description 8
- 238000003466 welding Methods 0.000 description 6
- 238000005304 joining Methods 0.000 description 5
- 238000005219 brazing Methods 0.000 description 4
- 230000003134 recirculating effect Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- -1 braze cladding Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000013528 metallic particle Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
- B23K26/142—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor for the removal of by-products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
- B23K26/144—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor the fluid stream containing particles, e.g. powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/32—Bonding taking account of the properties of the material involved
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/34—Laser welding for purposes other than joining
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/362—Laser etching
- B23K26/364—Laser etching for making a groove or trench, e.g. for scribing a break initiation groove
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
- B23K26/382—Removing material by boring or cutting by boring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
- B23K26/382—Removing material by boring or cutting by boring
- B23K26/389—Removing material by boring or cutting by boring of fluid openings, e.g. nozzles, jets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/40—Removing material taking account of the properties of the material involved
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/001—Interlayers, transition pieces for metallurgical bonding of workpieces
- B23K35/007—Interlayers, transition pieces for metallurgical bonding of workpieces at least one of the workpieces being of copper or another noble metal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
- F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
- F28F3/048—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of ribs integral with the element or local variations in thickness of the element, e.g. grooves, microchannels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/12—Elements constructed in the shape of a hollow panel, e.g. with channels
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
- H01L21/4814—Conductive parts
- H01L21/4871—Bases, plates or heatsinks
- H01L21/4878—Mechanical treatment, e.g. deforming
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
- H01L23/473—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/14—Heat exchangers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/12—Copper or alloys thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
- B23P2700/10—Heat sinks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4935—Heat exchanger or boiler making
Definitions
- This invention relates to a method of manufacturing an all-metal cold plate heat exchanger assembly.
- Forced air-cooling is typically used to remove excess heat generated by computing processing units (CPUs); however, forced air-cooling alone is no longer sufficient to meet the cooling needs of increasingly faster and hotter CPUs.
- An alternate to forced air-cooling is a recirculating closed-loop liquid cooling system. Recirculating closed-loop liquid cooling systems are known for their higher efficiency and capacity for excess heat removal.
- FIG. 1 A schematic of a typical recirculating closed-loop liquid cooling system for cooling a heat generating electronic component is shown in FIG. 1 . Illustrated is a recirculating closed-loop liquid cooling system 10 that includes a reservoir tank 15 , a coolant pump 22 , a cold plate heat exchanger assembly 25 , a radiator 35 , and a fan 40 .
- the cold plate heat exchanger assembly 25 is in thermal conductive contact with the heat generating electronic component 30 . It is understood that the heat generating electronic component 30 can represent a CPU.
- the coolant pump 22 transfers a liquid coolant from the reservoir tank 15 to the cold plate heat exchanger assembly 25 .
- the cold plate heat exchanger assembly 25 Within the cold plate heat exchanger assembly 25 are engineered flow channels, which provide a tortuous path for flow of liquid coolant in order to optimize heat transfer from the heat generating electronic component 30 to the coolant.
- the heated coolant After exiting the cold plate heat exchanger assembly 25 , the heated coolant continues to the radiator 35 where the heat is released to the ambient air by convection with the aid of a fan 40 blowing a stream of cooler air across the radiator 35 .
- the cooled coolant then returns to the reservoir tank 15 to repeat the heat transfer process.
- U.S. patent application Ser. No. 11/221,526 discloses an all-metal cold plate heat exchanger assembly with engineered flow channels.
- the disclosed cold plate assembly includes a base plate of copper having a flat exterior surface that is adapted to thermally bond to a heat generating electronic component. Located on the interior surface of the copper base plate are a series of micro-channels and associated micro-fins with coplanar edges.
- the base plate is assembled to a manifold cover and the interior surface of the manifold cover has manifold channels with corresponding co-planer surfaces that cooperate with the smaller coplanar edges of the micro-fins to define a path for coolant flow.
- the coplanar surfaces of the manifold channel are in intimate contact with the coplanar edges of the micro-fins of the base plate forming a checkerboard pattern for fluid flow, providing more effective and efficient heat extraction.
- the contact between the coplanar surfaces of the manifold channels and the coplanar edges of the micro-fins must be sufficiently tight, to prevent flow from bypassing the manifold channels, which would impair the regularity of the flow pattern and result in reduced heat transfer efficiency.
- One known method of manufacturing a cold plate assembly having good sealing characteristics between the contact surfaces of the manifold channels and the micro-fins is to utilize materials such as solder, braze cladding, or adhesives to provide a gasket material between the coplanar surfaces of the manifold channels and the coplanar edges of the micro-fins.
- a drawback for such materials is the tendency during the assembly process for such materials to seep into and clog the micro-channels.
- the subject invention provides a method of manufacturing an all-metal cold plate heat exchanger assembly for removing excess heat from a heat generating electronic component.
- the method assures a tight interface seal between the contact surfaces of the alternating channels of the manifold plate and the coplanar edges of the micro-fins which prevents coolant by-pass flow, but does not clog or jeopardize the coolant flow through the micro-channels, and is economical to manufacture and assemble.
- This method utilizes recast metallic particulates, a natural by-product of laser machining, as a compliant gasket material between the coplanar surfaces of the alternating channels and the coplanar edges of the micro-fins.
- the method includes providing a base plate formed of a material suitable for laser machining, preferably copper.
- a beam of laser energy is provided to machine alternating substantially parallel micro-channels and associated micro-fins into the interior surface of the copper base plate.
- the laser-machined surface of the copper base plate is vaporized into microscopic aerosol particulates, which are then cooled and condensed onto the coplanar edges of the micro-fin to form a layer of recast metal.
- the recast layer is microscopic and cannot be seen without magnification.
- a manifold cover and a manifold plate which may be integrated with the interior surface of the manifold cover, are provided.
- the manifold plate has alternating inlet-outlet channels with at least one face having coplanar edges.
- the manifold cover is arranged onto the base plate with the manifold plate in between, such that one face of inlet-outlet channel coplanar edges is disposed adjacent to the micro-fin edges with the recast layer in between.
- the manifold cover is then pressed toward the base plate to compress the recast layer to form a compliant gasket between the contact surfaces of the alternating inlet-outlet channels and micro-fins.
- the exterior joining surfaces of the base plate and manifold cover are hermetically sealed.
- One advantage of the present invention is that it utilizes the vapor-deposited copper particulate that is a natural by-product of the laser machining process used in the formation of the micro-channels to form a compliant gasket that facilitates the intimate contact between the micro-channels and the manifold channels, thus preventing flow by-pass and increasing thermal performance.
- Another advantage of the present invention is the elimination of the need to remove the recast layer prior to assembly; this, simplifies the manufacturing process and reduces cost.
- FIG. 1 is a schematic diagram of a closed-loop liquid cooling system for removing heat from a heat producing electronic component.
- FIG. 2 is an exploded perspective view of the various components of a cold plate heat exchanger assembly.
- FIG. 3 is a perspective view of the bottom of the manifold cover with an integrated manifold plate.
- FIG. 4 is an enlarged perspective view of a portion of the bottom surfaces of the manifold plate's channels crossing the top edges of the micro-fins.
- FIG. 5 is a schematic view of the flow pattern enabled by the completed cooling assembly.
- FIG. 6 is a cross section of the base cold plate as micro-channels are being machined onto the interior surface.
- FIG. 7 is an enlargement of detail circle shown in FIG. 6 showing a layer of recast metallic particulates on the coplanar edges of the micro-fins.
- FIG. 8 is a portion of the cold plate having a layer of recast metallic particulate materials on the coplanar edges of the micro-fins as the manifold cover is pressed onto base plate.
- FIG. 9 is an enlargement of detail circle shown in FIG. 8 showing the recast metal deforming and forming a compliant gasket between the top edges of the micro-fins and bottom surfaces of the manifold channels.
- FIGS. 1 through 9 shown is an all-metal micro-channel cold plate assembly.
- the cold plate assembly utilizes what is normally an undesirable by-product of laser machining, a layer of recast metallic particulates, as a compliant gasket between the contact surfaces of the top edges of the base cold plate micro-fins and bottom surfaces of the manifold channels.
- FIG. 2 shown is an exploded view of a preferred embodiment of the current invention, which is indicated generally at 20 .
- the primary components of the cold plate assembly 20 are a base plate 100 , a manifold cover 200 , a manifold plate 300 , and inlet/outlet pipes 400 .
- Manifold plate 300 is shown as a separate component; however, manifold plate 300 may be manufactured as an integral part of the interior face 210 of manifold cover 200 . All components are manufactured of a heat conducting metal, preferably pure substantially oxygen free copper. The components are assembled into an integral unit where the jointing surfaces are hermetically sealed by methods known in the art for joining metallic components that include, but not limited to, brazing, welding, chemical bonding, or resistance welding.
- Base plate 100 is substantially circular in shape and is approximately 34 mm in outer diameter with a thickness of approximately 1.0 mm.
- Base plate 100 has a perimeter wall 110 that is approximately 3.0 mm in height demarcating an inner surface 120 from outer surface 130 of base plate 100 .
- Inner surface 120 and outer surface 130 are machined to a high degree of flatness.
- Outer surface 130 is adapted to be thermally bonded to a heat producing electronic component.
- Inner surface 120 is laser machined to form a fin-channel pattern 135 that includes a dense pattern of extremely thin structures, alternating micro-channels 140 and micro-fins 150 . These are shown in greater detail in FIG. 4 .
- Fin-channel pattern 135 is substantially rectangular in outline and measures approximately 17 mm by 24 mm.
- micro-channels 140 are approximately 350 to 450 microns deep and approximately 60 microns wide.
- Micro-fins 150 have substantially flat coplanar edges 160 that are approximately 50 microns in width.
- Manifold cover 200 is also substantially circular in shape having an outer diameter of approximately 42 mm and is approximately 2 mm thick. Manifold cover 200 is adapted to engage perimeter wall 110 of base plate 100 and form a hermetically sealed structure. Located between the inner surface 120 of base plate 100 and interior face 210 of manifold cover 200 is a manifold plate 300 , which may be formed as an integral part of interior face 210 of manifold cover 200 as shown in FIG. 3 . Also attached to manifold cover 200 are inlet/outlet pipes 400 , which may be composed of the same materials as manifold cover 200 and base plate 100 . The joining surfaces of inlet/outlet pipe 400 are joined to manifold cover 200 by suitable methods such as welding or brazing.
- manifold plate 300 includes a sinuous wall 310 that forms a substantially rectangular pattern measuring approximately 14 by 21 mm, which is slightly smaller than fin-channel pattern 135 .
- the rectangular shape of manifold plate 300 is formed by the natural shape of sinuous wall 310 as it alternates forming a regular pattern of side-by-side alternating channels 320 .
- Sinuous wall 310 has opposing faces of coplanar surfaces 330 that are approximately 0.44 mm in width, and the width of the corresponding channel is approximately 0.50 mm.
- one face of coplanar surfaces 330 may be integral with interior face 210 of manifold cover 200 while the opposing face of coplanar surfaces 330 is exposed.
- the exposed coplanar surfaces 330 are substantially parallel to coplanar edges 160 of micro-fins 150 on base plate 100 and are adapted to be positioned to engage coplanar edges 160 in a crossing pattern.
- the height of sinuous wall 310 is approximately 2.0 mm, which is substantially the same as the interior distance between inner surface 120 of base plate 100 and interior face 210 of manifold cover 200 , when assembled, to provide close mechanical contact between coplanar surface 330 of manifold plate 300 and coplanar edges 160 of micro-fins 150 without significant bending or deformation of micro-fins 150 .
- a compliant gasket is applied, which will be discussed herein below in detail.
- the coplanar surfaces 330 of manifold plate 300 are in intimate contact with coplanar edges 160 of micro-fins 150 forming a checkerboard flow pattern. Coolant enters into alternating channels 320 of manifold plate 300 indicated by “X”, then down into the micro-channels 140 to flow under and across coplanar surfaces 330 , and then exits up into adjacent alternating channels 320 of manifold plate 300 , indicated at ‘O’, towards the outlet.
- inner surface 120 of base plate 100 is machined to a high degree of flatness.
- the inner surface 120 is then laser machined to form a fin-channel pattern 135 that includes a dense pattern of extremely thin structures that include micro-channels 140 and micro-fins 150 , which have corresponding coplanar edges 160 that are substantially planer to inner surface 120 .
- the vaporized metallic particles from the laser machining process are controlled so as to condense and remain on the coplanar edges 160 of micro-fins 150 to be used as a compliant metallic gasket 510 as shown in FIGS. 8 and 9 ; the method of which will be discussed herein below.
- the process of laser machining micro-channels onto a flat metallic surface is generally known in the art.
- a high-powered laser is focused on a targeted material, the mass of the material is removed by vaporization caused by the intense heat generated by the laser beam at the point of contact.
- the amount of material removed is determined by the pulse duration, energy, and wavelength of the laser, as well as by the number of passes by the laser beam. These variables can be controlled according to the need of the material targeted to be removed.
- the desired setting of the laser should be adequate to remove the material by vaporization and not so high as to cause liquid ejection or phase explosion of the targeted material.
- a beam of laser energy 520 from a laser device 560 is provided to cut substantially parallel micro-channels 140 into inner surface 120 of base plate 100 in a predefined fin-channel pattern 135 .
- the extremely high-energy input ablates the metallic base plate 100 at the point of contact by vaporizing the metallic mass into a plume 530 of aerosol microscopic particulate matter 540 .
- An inert blanket gas (not shown), such as nitrogen, is typically used to cover the surface of the work piece to prevent oxidation of the work piece and to cool plume 530 , thereby assisting in controlling the rate of precipitation of the microscopic particulate matter 540 .
- the blanket of inert gas cools plume 530 as it expands outward.
- the aerosol particulate matter 540 collides with each other and coalesces into larger particulates in the range of nanometers.
- the larger particulate matter condenses and settles onto the coplanar edges 160 of the micro-fins 150 forming a layer of recast metal.
- the recast layer is allowed to remain on top of the coplanar edges 160 of micro-fins 150 .
- Recast layer 500 consists of the same metallic material as base plate 100 and is at a consistency that is malleable enough to form a compliant gasket 510 between coplanar edges 160 of micro-fins and coplanar surfaces 330 of manifold plate 300 .
- the recast layer 500 aids in the critical seal by deforming on a microscopic level to average out any inconsistencies in the micro-channel peak-to-peak dimensions and facilitates the required intimate contact.
- the height and percentage coverage of the recast layer can be controlled by varying the intensity of the laser, temperature of the inert cover gas, and duration of cut. It is preferable that the temperature is below the dew point of the vaporized metallic particulates.
- the height of the recast layer 500 is defined by the distance between the coplanar edges 160 of micro-fins 150 , which is substantially planar with inner surface 120 of base plate 100 , and plateau 550 of recast layer 500 shown as distance ‘X’ in FIG. 7 .
- the ratio of coverage is defined by the width of coplanar edge 160 of micro-fin 150 that is occupied by recast layer 500 , indicated as distance ‘A’, divided by the total width of coplanar edge 160 shown as ‘B.’
- the optimum height ‘X’ of the recast layer 500 on the micro-fins coplanar edges 160 is determined through laboratory analysis and testing to be approximately 30 to 64 microns; and the preferred ratio of coverage is 0.3 to 1.0. Any height greater than 64 microns may result in the excess recast layer 500 deforming into micro-channels 140 to obstruct coolant flow.
- a manifold cover 200 having a manifold interior face 210 and manifold plate 300 is arranged over base plate 100 , with the channels 320 of manifold plate 300 substantially perpendicular to micro-channels 140 of base plate 100 .
- Manifold cover 200 is then positioned onto base plate 100 such that the coplanar surfaces 330 of manifold plate 300 are disposed adjacent to the micro-fin coplanar edges 160 with recast layer 500 in between.
- Manifold cover 200 is pressed toward base plate 100 to compress recast layer 500 to form a compliant gasket 510 in between.
- the exterior joining surfaces of the base plate 100 and manifold cover 200 are hermetically sealed by any of the known methods in the art; however, brazing is preferable. At temperatures favorable to brazing, recast layer 500 becomes more ductile and lends itself readily to act as a conformable layer to reduce fluid bypass.
- cold plate assembly 20 has been described as removing excess heat from a heat generating electronic component; those skilled in the art can recognize that cold plate assembly 20 can also function by adding heat to a component by pumping preheated coolant through the cold plate assembly 20 .
- cold plate assembly has been described as being all-metal.
- Those skilled in the art can substitute alternative materials other than metal for components that are not crucial to the making or using of the present invention. Therefore, it will be understood that it is not intended to limit the method of the invention to just the embodiment disclosed.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The subject invention provides a method of manufacturing an all-metal cold plate heat exchanger assembly for removing excess heat from a heat generating electronic component. The cold plate assembly includes a base plate having micro-channels and associated micro-fins, a manifold plate having alternating channels, and a manifold cover, wherein the manifold plate cooperates with the micro-channels to form an engineered pathway for coolant flow. This method assures a tight interface sealing between the contact surfaces of the alternating channels of the manifold plate and the coplanar surfaces of the micro-fins that would prevent coolant by-pass flow, but without clogging or jeopardizing the flow through the micro-channels. This method utilizes a layer of recast metallic particulates, which is a natural by-product of laser machining, as a compliant gasket material between the coplanar edges of the alternating channels and the coplanar edges of the micro-fins.
Description
- This invention relates to a method of manufacturing an all-metal cold plate heat exchanger assembly.
- Forced air-cooling is typically used to remove excess heat generated by computing processing units (CPUs); however, forced air-cooling alone is no longer sufficient to meet the cooling needs of increasingly faster and hotter CPUs. An alternate to forced air-cooling is a recirculating closed-loop liquid cooling system. Recirculating closed-loop liquid cooling systems are known for their higher efficiency and capacity for excess heat removal.
- A schematic of a typical recirculating closed-loop liquid cooling system for cooling a heat generating electronic component is shown in
FIG. 1 . Illustrated is a recirculating closed-loopliquid cooling system 10 that includes areservoir tank 15, acoolant pump 22, a cold plateheat exchanger assembly 25, aradiator 35, and afan 40. The cold plateheat exchanger assembly 25 is in thermal conductive contact with the heat generatingelectronic component 30. It is understood that the heat generatingelectronic component 30 can represent a CPU. - The
coolant pump 22 transfers a liquid coolant from thereservoir tank 15 to the cold plateheat exchanger assembly 25. Within the cold plateheat exchanger assembly 25 are engineered flow channels, which provide a tortuous path for flow of liquid coolant in order to optimize heat transfer from the heat generatingelectronic component 30 to the coolant. After exiting the cold plateheat exchanger assembly 25, the heated coolant continues to theradiator 35 where the heat is released to the ambient air by convection with the aid of afan 40 blowing a stream of cooler air across theradiator 35. The cooled coolant then returns to thereservoir tank 15 to repeat the heat transfer process. - U.S. patent application Ser. No. 11/221,526 discloses an all-metal cold plate heat exchanger assembly with engineered flow channels. The disclosed cold plate assembly includes a base plate of copper having a flat exterior surface that is adapted to thermally bond to a heat generating electronic component. Located on the interior surface of the copper base plate are a series of micro-channels and associated micro-fins with coplanar edges. The base plate is assembled to a manifold cover and the interior surface of the manifold cover has manifold channels with corresponding co-planer surfaces that cooperate with the smaller coplanar edges of the micro-fins to define a path for coolant flow.
- When the manifold cover is engaged to the base plate, the coplanar surfaces of the manifold channel are in intimate contact with the coplanar edges of the micro-fins of the base plate forming a checkerboard pattern for fluid flow, providing more effective and efficient heat extraction. The contact between the coplanar surfaces of the manifold channels and the coplanar edges of the micro-fins must be sufficiently tight, to prevent flow from bypassing the manifold channels, which would impair the regularity of the flow pattern and result in reduced heat transfer efficiency.
- One known method of manufacturing a cold plate assembly having good sealing characteristics between the contact surfaces of the manifold channels and the micro-fins is to utilize materials such as solder, braze cladding, or adhesives to provide a gasket material between the coplanar surfaces of the manifold channels and the coplanar edges of the micro-fins. A drawback for such materials is the tendency during the assembly process for such materials to seep into and clog the micro-channels.
- Another known method of manufacturing a cold plate assembly having good sealing characteristics between the contact surfaces of the manifold channels and the coplanar edges of the micro-fins is resistance welding, which is disclosed in U.S. patent application Ser. No. 11/221,526. The drawbacks to resistance welding are the cost of materials and complexity of the manufacturing operation. Resistance welding requires the use of highly pure, oxygen free copper that is both electronically and thermally conductive. In addition to the material requirements, the joining surfaces of the cold plate assembly require precision machining to exact specifications.
- There exists a need for an economical method of manufacturing an all-metal micro-channel cold plate heat exchanger assembly that assures a tight interface seal between the contact surfaces of the manifold channels and the micro-fins without clogging the micro-channels.
- The subject invention provides a method of manufacturing an all-metal cold plate heat exchanger assembly for removing excess heat from a heat generating electronic component. The method assures a tight interface seal between the contact surfaces of the alternating channels of the manifold plate and the coplanar edges of the micro-fins which prevents coolant by-pass flow, but does not clog or jeopardize the coolant flow through the micro-channels, and is economical to manufacture and assemble. This method utilizes recast metallic particulates, a natural by-product of laser machining, as a compliant gasket material between the coplanar surfaces of the alternating channels and the coplanar edges of the micro-fins.
- The method includes providing a base plate formed of a material suitable for laser machining, preferably copper. A beam of laser energy is provided to machine alternating substantially parallel micro-channels and associated micro-fins into the interior surface of the copper base plate. During the laser machining process, the laser-machined surface of the copper base plate is vaporized into microscopic aerosol particulates, which are then cooled and condensed onto the coplanar edges of the micro-fin to form a layer of recast metal. The recast layer is microscopic and cannot be seen without magnification.
- A manifold cover and a manifold plate, which may be integrated with the interior surface of the manifold cover, are provided. The manifold plate has alternating inlet-outlet channels with at least one face having coplanar edges. The manifold cover is arranged onto the base plate with the manifold plate in between, such that one face of inlet-outlet channel coplanar edges is disposed adjacent to the micro-fin edges with the recast layer in between. The manifold cover is then pressed toward the base plate to compress the recast layer to form a compliant gasket between the contact surfaces of the alternating inlet-outlet channels and micro-fins. The exterior joining surfaces of the base plate and manifold cover are hermetically sealed.
- One advantage of the present invention is that it utilizes the vapor-deposited copper particulate that is a natural by-product of the laser machining process used in the formation of the micro-channels to form a compliant gasket that facilitates the intimate contact between the micro-channels and the manifold channels, thus preventing flow by-pass and increasing thermal performance.
- Another advantage of the present invention is the elimination of the need to remove the recast layer prior to assembly; this, simplifies the manufacturing process and reduces cost.
- Further features and advantages of the invention will appear more clearly on a reading of the following detailed description of the preferred embodiment of the invention, which is given by way of non-limiting example only and with reference to the accompanying drawings.
- This invention will be further described with reference to the accompanying drawings in which:
-
FIG. 1 is a schematic diagram of a closed-loop liquid cooling system for removing heat from a heat producing electronic component. -
FIG. 2 is an exploded perspective view of the various components of a cold plate heat exchanger assembly. -
FIG. 3 is a perspective view of the bottom of the manifold cover with an integrated manifold plate. -
FIG. 4 is an enlarged perspective view of a portion of the bottom surfaces of the manifold plate's channels crossing the top edges of the micro-fins. -
FIG. 5 is a schematic view of the flow pattern enabled by the completed cooling assembly. -
FIG. 6 is a cross section of the base cold plate as micro-channels are being machined onto the interior surface. -
FIG. 7 is an enlargement of detail circle shown inFIG. 6 showing a layer of recast metallic particulates on the coplanar edges of the micro-fins. -
FIG. 8 is a portion of the cold plate having a layer of recast metallic particulate materials on the coplanar edges of the micro-fins as the manifold cover is pressed onto base plate. -
FIG. 9 is an enlargement of detail circle shown inFIG. 8 showing the recast metal deforming and forming a compliant gasket between the top edges of the micro-fins and bottom surfaces of the manifold channels. - In accordance with a preferred embodiment of this invention, referring to
FIGS. 1 through 9 , shown is an all-metal micro-channel cold plate assembly. The cold plate assembly utilizes what is normally an undesirable by-product of laser machining, a layer of recast metallic particulates, as a compliant gasket between the contact surfaces of the top edges of the base cold plate micro-fins and bottom surfaces of the manifold channels. - In reference to
FIG. 2 , shown is an exploded view of a preferred embodiment of the current invention, which is indicated generally at 20. The primary components of thecold plate assembly 20 are abase plate 100, amanifold cover 200, amanifold plate 300, and inlet/outlet pipes 400. Manifoldplate 300 is shown as a separate component; however,manifold plate 300 may be manufactured as an integral part of theinterior face 210 ofmanifold cover 200. All components are manufactured of a heat conducting metal, preferably pure substantially oxygen free copper. The components are assembled into an integral unit where the jointing surfaces are hermetically sealed by methods known in the art for joining metallic components that include, but not limited to, brazing, welding, chemical bonding, or resistance welding. -
Base plate 100 is substantially circular in shape and is approximately 34 mm in outer diameter with a thickness of approximately 1.0 mm.Base plate 100 has aperimeter wall 110 that is approximately 3.0 mm in height demarcating aninner surface 120 fromouter surface 130 ofbase plate 100.Inner surface 120 andouter surface 130 are machined to a high degree of flatness.Outer surface 130 is adapted to be thermally bonded to a heat producing electronic component.Inner surface 120 is laser machined to form a fin-channel pattern 135 that includes a dense pattern of extremely thin structures, alternating micro-channels 140 andmicro-fins 150. These are shown in greater detail inFIG. 4 . Fin-channel pattern 135 is substantially rectangular in outline and measures approximately 17 mm by 24 mm. In laser machining fin-channel pattern 135, a beam of laser energy is used to cut the pattern ofmicro-channels 140 andmicro-fins 150. Shown inFIGS. 6 and 7 , micro-channels 140 are approximately 350 to 450 microns deep and approximately 60 microns wide.Micro-fins 150 have substantially flatcoplanar edges 160 that are approximately 50 microns in width. -
Manifold cover 200 is also substantially circular in shape having an outer diameter of approximately 42 mm and is approximately 2 mm thick.Manifold cover 200 is adapted to engageperimeter wall 110 ofbase plate 100 and form a hermetically sealed structure. Located between theinner surface 120 ofbase plate 100 andinterior face 210 ofmanifold cover 200 is amanifold plate 300, which may be formed as an integral part ofinterior face 210 ofmanifold cover 200 as shown inFIG. 3 . Also attached tomanifold cover 200 are inlet/outlet pipes 400, which may be composed of the same materials asmanifold cover 200 andbase plate 100. The joining surfaces of inlet/outlet pipe 400 are joined tomanifold cover 200 by suitable methods such as welding or brazing. - In reference to
FIGS. 3 and 4 ,manifold plate 300 includes asinuous wall 310 that forms a substantially rectangular pattern measuring approximately 14 by 21 mm, which is slightly smaller than fin-channel pattern 135. The rectangular shape ofmanifold plate 300 is formed by the natural shape ofsinuous wall 310 as it alternates forming a regular pattern of side-by-side alternating channels 320.Sinuous wall 310 has opposing faces ofcoplanar surfaces 330 that are approximately 0.44 mm in width, and the width of the corresponding channel is approximately 0.50 mm. - In reference to
FIG. 3 , one face ofcoplanar surfaces 330 may be integral withinterior face 210 ofmanifold cover 200 while the opposing face ofcoplanar surfaces 330 is exposed. The exposedcoplanar surfaces 330 are substantially parallel tocoplanar edges 160 ofmicro-fins 150 onbase plate 100 and are adapted to be positioned to engagecoplanar edges 160 in a crossing pattern. The height ofsinuous wall 310 is approximately 2.0 mm, which is substantially the same as the interior distance betweeninner surface 120 ofbase plate 100 andinterior face 210 ofmanifold cover 200, when assembled, to provide close mechanical contact betweencoplanar surface 330 ofmanifold plate 300 andcoplanar edges 160 ofmicro-fins 150 without significant bending or deformation ofmicro-fins 150. To prevent by-pass leaks created by less than solid contact betweencoplanar surfaces 330 andcoplanar edges 160, a compliant gasket is applied, which will be discussed herein below in detail. - In reference to
FIG. 5A , once themanifold cover 200 is assembled tobase plate 100 withmanifold plate 300 there between, thecoplanar surfaces 330 ofmanifold plate 300 are in intimate contact withcoplanar edges 160 ofmicro-fins 150 forming a checkerboard flow pattern. Coolant enters into alternatingchannels 320 ofmanifold plate 300 indicated by “X”, then down into the micro-channels 140 to flow under and acrosscoplanar surfaces 330, and then exits up into adjacent alternatingchannels 320 ofmanifold plate 300, indicated at ‘O’, towards the outlet. - As discussed herein above,
inner surface 120 ofbase plate 100 is machined to a high degree of flatness. Theinner surface 120 is then laser machined to form a fin-channel pattern 135 that includes a dense pattern of extremely thin structures that include micro-channels 140 andmicro-fins 150, which have correspondingcoplanar edges 160 that are substantially planer toinner surface 120. In reference toFIGS. 6 and 7 , the vaporized metallic particles from the laser machining process are controlled so as to condense and remain on thecoplanar edges 160 ofmicro-fins 150 to be used as a compliantmetallic gasket 510 as shown inFIGS. 8 and 9 ; the method of which will be discussed herein below. - The process of laser machining micro-channels onto a flat metallic surface is generally known in the art. As a high-powered laser is focused on a targeted material, the mass of the material is removed by vaporization caused by the intense heat generated by the laser beam at the point of contact. The amount of material removed is determined by the pulse duration, energy, and wavelength of the laser, as well as by the number of passes by the laser beam. These variables can be controlled according to the need of the material targeted to be removed. The desired setting of the laser should be adequate to remove the material by vaporization and not so high as to cause liquid ejection or phase explosion of the targeted material.
- In reference to
FIG. 6 , a beam oflaser energy 520 from alaser device 560 is provided to cut substantiallyparallel micro-channels 140 intoinner surface 120 ofbase plate 100 in a predefined fin-channel pattern 135. When a pulse oflaser energy 520 makes contact withinner surface 120, the extremely high-energy input ablates themetallic base plate 100 at the point of contact by vaporizing the metallic mass into aplume 530 of aerosol microscopic particulate matter 540. An inert blanket gas (not shown), such as nitrogen, is typically used to cover the surface of the work piece to prevent oxidation of the work piece and tocool plume 530, thereby assisting in controlling the rate of precipitation of the microscopic particulate matter 540. - The blanket of inert gas cools
plume 530 as it expands outward. The aerosol particulate matter 540 collides with each other and coalesces into larger particulates in the range of nanometers. The larger particulate matter condenses and settles onto thecoplanar edges 160 of themicro-fins 150 forming a layer of recast metal. Contrary to the teachings of the prior art to use an acid solution to remove the recast layer, the recast layer is allowed to remain on top of thecoplanar edges 160 ofmicro-fins 150. Recastlayer 500 consists of the same metallic material asbase plate 100 and is at a consistency that is malleable enough to form acompliant gasket 510 betweencoplanar edges 160 of micro-fins andcoplanar surfaces 330 ofmanifold plate 300. - As discussed herein above, it is critically important to insure intimate contact between the
coplanar edges 160 ofmicro-fins 150 andcoplanar surfaces 330 ofmanifold plate 300 to prevent fluid bypass. The recastlayer 500 aids in the critical seal by deforming on a microscopic level to average out any inconsistencies in the micro-channel peak-to-peak dimensions and facilitates the required intimate contact. - The height and percentage coverage of the recast layer can be controlled by varying the intensity of the laser, temperature of the inert cover gas, and duration of cut. It is preferable that the temperature is below the dew point of the vaporized metallic particulates.
- The height of the recast
layer 500 is defined by the distance between thecoplanar edges 160 ofmicro-fins 150, which is substantially planar withinner surface 120 ofbase plate 100, andplateau 550 of recastlayer 500 shown as distance ‘X’ inFIG. 7 . The ratio of coverage is defined by the width ofcoplanar edge 160 ofmicro-fin 150 that is occupied by recastlayer 500, indicated as distance ‘A’, divided by the total width ofcoplanar edge 160 shown as ‘B.’ The optimum height ‘X’ of the recastlayer 500 on the micro-finscoplanar edges 160 is determined through laboratory analysis and testing to be approximately 30 to 64 microns; and the preferred ratio of coverage is 0.3 to 1.0. Any height greater than 64 microns may result in the excess recastlayer 500 deforming intomicro-channels 140 to obstruct coolant flow. - Once recast
layer 500 has been formed oncoplanar edges 160 ofmicro-fins 150, amanifold cover 200 having a manifoldinterior face 210 andmanifold plate 300 is arranged overbase plate 100, with thechannels 320 ofmanifold plate 300 substantially perpendicular to micro-channels 140 ofbase plate 100.Manifold cover 200 is then positioned ontobase plate 100 such that thecoplanar surfaces 330 ofmanifold plate 300 are disposed adjacent to the micro-fincoplanar edges 160 with recastlayer 500 in between.Manifold cover 200 is pressed towardbase plate 100 to compress recastlayer 500 to form acompliant gasket 510 in between. - The exterior joining surfaces of the
base plate 100 andmanifold cover 200 are hermetically sealed by any of the known methods in the art; however, brazing is preferable. At temperatures favorable to brazing, recastlayer 500 becomes more ductile and lends itself readily to act as a conformable layer to reduce fluid bypass. - While this invention has been described in terms of the preferred embodiments thereof, it is not intended to be so limited, but rather only to the extent set forth in the claims that follow. Dimensions are only presented to illustrate the diminutive size of cold plate
heat exchanger assembly 20 and are not intended to be limiting. Those skilled in the art can adjust the dimensions ofcold plate assembly 20 to accommodate specific heat transfer requirements. - Furthermore, the function of
cold plate assembly 20 has been described as removing excess heat from a heat generating electronic component; those skilled in the art can recognize thatcold plate assembly 20 can also function by adding heat to a component by pumping preheated coolant through thecold plate assembly 20. - Still furthermore, cold plate assembly has been described as being all-metal. Those skilled in the art can substitute alternative materials other than metal for components that are not crucial to the making or using of the present invention. Therefore, it will be understood that it is not intended to limit the method of the invention to just the embodiment disclosed.
Claims (11)
1. A method of manufacturing a cold plate heat exchanger assembly for a heat-producing component, comprising the steps of:
providing a base plate formed of a material suitable for laser machining, wherein said base plate has an interior surface that is substantially planar;
providing a manifold cover;
providing a manifold plate having alternating inlet-outlet channels, wherein said inlet-outlet channels have coplanar surfaces;
laser machining a pattern of alternating substantially parallel micro-channels and micro-fins into said base plate interior surface, wherein each of said micro-fins have a micro-fin edge, and wherein said laser machining includes controlling laser energy and ambient temperature to produces aerosol particulate matter that rises from said micro-channels and deposits onto said micro-fin edges to form a recast layer;
arranging said cover manifold onto said base plate with said manifold plate in between such that said inlet-outlet channel coplanar surfaces are disposed adjacent to said micro-fin edges with said recast layer in between;
pressing said manifold cover toward said base plate to compress the recast layer to form a compliant gasket in between; and
hermetically sealing said base plate to said manifold cover.
2. The method of manufacturing a cold plate assembly of claim 1 wherein the step of said laser machining further comprises the steps of:
blanketing said base plate interior surface with an inert cover gas having a predetermined temperature below dew point of said vaporized base plate material; and
focusing and maneuvering a laser beam onto said base plate interior surface, wherein said laser beam has sufficient intensity to vaporize said base plate material into said aerosol particulate matter, thereby forming said micro-channels and said micro-fins;
wherein said vaporized base plate material rises from said micro-channels into said cover gas and condenses into micro-droplets, which then deposit onto said micro-fin edges to form said recast layer.
3. The method of manufacturing a cold plate assembly of claim 1 , wherein said recast layer has a height less than 65 microns.
4. The method of manufacturing a cold plate assembly of claim 3 , wherein said recast layer has a height in the range 30 to 64 microns.
5. The method of manufacturing a cold plate assembly of claim 1 , where said recast layer has a coverage ratio in the range 0.3 to 1.0
6. The method of manufacturing a cold plate assembly of claim 1 , wherein said manifold plate is formed integrally with manifold cover.
7. The method of manufacturing a cold plate assembly of claim 1 , wherein said base plate is formed of copper.
8. A method of manufacturing a cold plate heat exchanger assembly for an electronic component, comprising the steps of:
providing a base plate formed of copper, wherein said base plate has an interior surface that is substantially planar;
providing a manifold cover and alternating inlet-outlet channels, wherein said inlet-outlet channels have coplanar surfaces;
providing a blanket of inert cover gas on to said base plate;
laser machining a pattern of alternating substantially parallel micro-channels and micro-fins into said base plate interior surface, wherein each of said micro-fins have a micro-fin edge, and wherein said laser machining includes controlling laser energy to produce aerosol particulate matter that rises from said micro-channels into said cover gas and controlling temperature of said cover gas so that said aerosol particulate matter condenses onto said micro-fin edges to form a recast layer;
arranging said cover manifold onto said base plate such that said inlet-outlet channel coplanar surfaces are disposed adjacent to said micro-fin edges with said recast layer in between;
pressing said manifold cover toward said base plate to compress the recast layer to form a compliant gasket in between; and
hermetically sealing said base plate to said manifold cover.
9. The method of manufacturing a cold plate assembly of claim 8 , wherein said recast layer has a height in the range 30 to 64 microns.
10. The method of manufacturing a cold plate assembly of claim 9 , where said recast layer has a coverage ratio in the range 0.3 to 1.0.
11. The method of manufacturing a cold plate assembly of claim 10 , wherein said coplanar surfaces of said inlet-outlet channels are in intimate contact with coplanar edges of micro-fins forming a checker board flow pattern.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/810,662 US20080301941A1 (en) | 2007-06-06 | 2007-06-06 | Method of manufacturing a cold plate heat exchanger assembly having a metallic compliant gasket |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/810,662 US20080301941A1 (en) | 2007-06-06 | 2007-06-06 | Method of manufacturing a cold plate heat exchanger assembly having a metallic compliant gasket |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080301941A1 true US20080301941A1 (en) | 2008-12-11 |
Family
ID=40094513
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/810,662 Abandoned US20080301941A1 (en) | 2007-06-06 | 2007-06-06 | Method of manufacturing a cold plate heat exchanger assembly having a metallic compliant gasket |
Country Status (1)
Country | Link |
---|---|
US (1) | US20080301941A1 (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130068436A1 (en) * | 2008-04-29 | 2013-03-21 | Raytheon Company | Scaleable parallel flow micro-channel heat exchanger and method for manufacturing same |
CN103175432A (en) * | 2013-04-08 | 2013-06-26 | 中国船舶重工集团公司第七一一研究所 | Heat exchange plate for plate-type evaporator |
EP2562809A3 (en) * | 2011-08-22 | 2018-01-24 | General Electric Company | High performance liquid cooled heatsink for igbt modules |
US10393448B2 (en) | 2015-07-01 | 2019-08-27 | Alfa Laval Corporate Ab | Plate heat exchanger |
CN110340198A (en) * | 2019-06-28 | 2019-10-18 | 鑫佰图科技(惠州)有限公司 | The processing method of radiating fin and radiating fin |
US11454666B2 (en) * | 2020-04-20 | 2022-09-27 | Aem Singapore Pte Ltd | Thermal test head for an integrated circuit device |
US11473860B2 (en) * | 2019-04-25 | 2022-10-18 | Coolit Systems, Inc. | Cooling module with leak detector and related systems |
US11661936B2 (en) | 2013-03-15 | 2023-05-30 | Coolit Systems, Inc. | Sensors, multiplexed communication techniques, and related systems |
US11662037B2 (en) | 2019-01-18 | 2023-05-30 | Coolit Systems, Inc. | Fluid flow control valve for fluid flow systems, and methods |
US11714432B2 (en) | 2011-08-11 | 2023-08-01 | Coolit Systems, Inc. | Flow-path controllers and related systems |
US11725886B2 (en) | 2021-05-20 | 2023-08-15 | Coolit Systems, Inc. | Modular fluid heat exchange systems |
US11994350B2 (en) | 2007-08-09 | 2024-05-28 | Coolit Systems, Inc. | Fluid heat exchange systems |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6355976B1 (en) * | 1992-05-14 | 2002-03-12 | Reveo, Inc | Three-dimensional packaging technology for multi-layered integrated circuits |
US6388317B1 (en) * | 2000-09-25 | 2002-05-14 | Lockheed Martin Corporation | Solid-state chip cooling by use of microchannel coolant flow |
-
2007
- 2007-06-06 US US11/810,662 patent/US20080301941A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6355976B1 (en) * | 1992-05-14 | 2002-03-12 | Reveo, Inc | Three-dimensional packaging technology for multi-layered integrated circuits |
US6388317B1 (en) * | 2000-09-25 | 2002-05-14 | Lockheed Martin Corporation | Solid-state chip cooling by use of microchannel coolant flow |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11994350B2 (en) | 2007-08-09 | 2024-05-28 | Coolit Systems, Inc. | Fluid heat exchange systems |
US8925623B2 (en) * | 2008-04-29 | 2015-01-06 | Raytheon Company | Scaleable parallel flow micro-channel heat exchanger and method for manufacturing same |
US20130068436A1 (en) * | 2008-04-29 | 2013-03-21 | Raytheon Company | Scaleable parallel flow micro-channel heat exchanger and method for manufacturing same |
US11714432B2 (en) | 2011-08-11 | 2023-08-01 | Coolit Systems, Inc. | Flow-path controllers and related systems |
EP2562809A3 (en) * | 2011-08-22 | 2018-01-24 | General Electric Company | High performance liquid cooled heatsink for igbt modules |
US11661936B2 (en) | 2013-03-15 | 2023-05-30 | Coolit Systems, Inc. | Sensors, multiplexed communication techniques, and related systems |
CN103175432A (en) * | 2013-04-08 | 2013-06-26 | 中国船舶重工集团公司第七一一研究所 | Heat exchange plate for plate-type evaporator |
US10393448B2 (en) | 2015-07-01 | 2019-08-27 | Alfa Laval Corporate Ab | Plate heat exchanger |
US11662037B2 (en) | 2019-01-18 | 2023-05-30 | Coolit Systems, Inc. | Fluid flow control valve for fluid flow systems, and methods |
US11473860B2 (en) * | 2019-04-25 | 2022-10-18 | Coolit Systems, Inc. | Cooling module with leak detector and related systems |
US11725890B2 (en) | 2019-04-25 | 2023-08-15 | Coolit Systems, Inc. | Cooling module with leak detector and related systems |
CN110340198A (en) * | 2019-06-28 | 2019-10-18 | 鑫佰图科技(惠州)有限公司 | The processing method of radiating fin and radiating fin |
US11454666B2 (en) * | 2020-04-20 | 2022-09-27 | Aem Singapore Pte Ltd | Thermal test head for an integrated circuit device |
US11725886B2 (en) | 2021-05-20 | 2023-08-15 | Coolit Systems, Inc. | Modular fluid heat exchange systems |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20080301941A1 (en) | Method of manufacturing a cold plate heat exchanger assembly having a metallic compliant gasket | |
US20190033006A1 (en) | Ultra Thin Heat Exchangers For Thermal Management | |
JP2814868B2 (en) | Plate type heat exchanger and method of manufacturing the same | |
EP1276362B1 (en) | Flattened tube cold plate for liquid cooling electrical components | |
KR100238769B1 (en) | Heat pipe | |
US7677299B2 (en) | Nearly isothermal heat pipe heat sink | |
EP1790007B1 (en) | Micro-structured cooler and use thereof | |
US7537047B2 (en) | Liquid-cooling heat sink | |
CN1717295B (en) | Method of fabricating multi-channel devices and multi-channel devices therefrom | |
JP4874664B2 (en) | heat pipe | |
JP6809643B1 (en) | Vapor chamber and electronic equipment | |
US20060113063A1 (en) | Thin-plate microchannel structure | |
JP4465364B2 (en) | Method for manufacturing a cooler or cooler element comprising a plate stack, in particular a plate stack | |
WO2008109804A1 (en) | Vapor-augmented heat spreader device | |
US20120318480A1 (en) | Heat sink having juxtaposed heat pipes and method for manufacturing the same | |
CN102066863A (en) | Thermal transport device producing method and thermal transport device | |
WO2021263034A1 (en) | Integrated hybrid compact fluid heat exchanger | |
KR20040105683A (en) | Evaporative hydrophilic surface for a heat exchanger, method of making the same and composition therefor | |
JP2005085824A (en) | Cooling unit, its manufacturing method, and semiconductor laser device | |
EP3247521B1 (en) | A heat exchanger comprising micro channels and manufacturing thereof | |
JP5853727B2 (en) | Manufacturing method of power module substrate with heat sink | |
CN109848666A (en) | A kind of production method of microchannel cold plates | |
JP2018076978A (en) | Loop heat pipe and electronic device | |
JP2002286384A (en) | Heat pipe and its manufacturing method | |
CN115866965A (en) | Heat dissipation device, preparation method of heat dissipation device and electronic equipment |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: DELPHI TECHNOLOGIES, INC., MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ANDERSON, JR., RUSSELL C.;BARTEN, BRIAN L.;BENOIT, JOHN;AND OTHERS;REEL/FRAME:019452/0444;SIGNING DATES FROM 20070507 TO 20070518 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE |