WO2011087027A1 - 液冷一体型基板および液冷一体型基板の製造方法 - Google Patents
液冷一体型基板および液冷一体型基板の製造方法 Download PDFInfo
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- WO2011087027A1 WO2011087027A1 PCT/JP2011/050380 JP2011050380W WO2011087027A1 WO 2011087027 A1 WO2011087027 A1 WO 2011087027A1 JP 2011050380 W JP2011050380 W JP 2011050380W WO 2011087027 A1 WO2011087027 A1 WO 2011087027A1
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- radiator
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- 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
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
- H01L23/3735—Laminates or multilayers, e.g. direct bond copper ceramic substrates
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
-
- 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0058—Laminating printed circuit boards onto other substrates, e.g. metallic substrates
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- 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0306—Inorganic insulating substrates, e.g. ceramic, glass
Definitions
- the present invention relates to a metal / ceramic bonding substrate, and in particular, a metal circuit board and a metal base plate each made of aluminum or an aluminum alloy are bonded to both surfaces of the ceramic substrate, and a radiator to the surface of the metal base plate not bonded to the ceramic substrate.
- the present invention relates to a liquid-cooled integrated substrate to which is bonded and a manufacturing method thereof.
- a metal-ceramic insulating substrate is provided on one side of a metal plate or composite material called a base plate.
- An electronic component such as a semiconductor chip is fixed on the metal-ceramic insulating substrate by soldering.
- a radiator such as a metal radiating fin or a cooling jacket is attached to the other surface (back surface) of the base plate through heat conductive grease by screwing or the like.
- the base plate Since soldering of the base plate and electronic parts to the metal-ceramic insulating substrate is performed by heating, the base plate is likely to warp due to the difference in thermal expansion coefficient between the joining members during soldering. In addition, the heat generated from the electronic parts is released to the air, cooling water, etc. by the radiating fins and the cooling jacket (heatsink) through the metal-ceramic insulating substrate, the solder and the base plate, causing the base plate to warp. Then, the clearance when the radiating fins and the cooling jacket are attached to the base plate is increased, and the heat dissipation performance is extremely lowered.
- Patent Document 1 a heat dissipating fin (reinforcing portion) and a metal base plate that can greatly reduce the warp of the base plate, which is the above problem, are integrally formed and manufactured by a molten metal joining method.
- a metal-ceramic direct bonding substrate is disclosed.
- Patent Document 2 and Patent Document 3 disclose a cooling jacket that is attached to a metal base plate, a heat radiating fin, or the like and efficiently cools the heat generating body.
- a heat radiating fin is integrally provided on one surface of the metal base plate as a mechanism for radiating heat, and the metal base plate made of aluminum or aluminum alloy is provided.
- the metal base plate made of aluminum or aluminum alloy.
- the metal base plate may be warped due to residual stress generated in the metal base plate during processing.
- the groove processing is performed to form a plurality of radiating fins, the strength of the entire metal-ceramic substrate (the entire integrated substrate) may be insufficient.
- the metal-ceramic substrate described in Patent Document 1 has room for further improvement in its heat dissipation (cooling efficiency) because there is a risk that sufficient transient heat conduction may not be ensured.
- the object of the present invention is to reduce the raw material cost and processing cost, reduce warping (shape deformation) as an integrated substrate, and have a liquid cooling integrated type with excellent strength and heat dissipation.
- An object of the present invention is to provide a method of manufacturing a substrate and a liquid-cooled integrated substrate.
- a metal circuit board made of aluminum or an aluminum alloy is joined to one surface of a ceramic substrate, and a flat metal base made of aluminum or an aluminum alloy is joined to the other surface.
- the thickness t1 of the metal circuit plate And the thickness t2 of the metal base plate satisfy the following formula (1): t2 / t1 ⁇ 2 (1)
- a liquid-cooled integrated substrate is provided in which the thickness t1 of the metal circuit board is 0.4 to 3 mm and the thickness t2 of the metal base board is 0.8 to 6 mm.
- the radiator may be a porous tube, and the metal base plate and the radiator may be brazed and joined.
- the relationship between the groove width W (mm) which is the flow path of the refrigerant of the porous tube and the width T (mm) of the partition plate ⁇ W + 1.4 ⁇ T / W ⁇ 1.5W + 3.3 (when 0.4 ⁇ W ⁇ 1.0) -0.2W + 0.7 ⁇ T / W ⁇ -1.5W + 3.3 (when 1.0 ⁇ W ⁇ 2.0) It is preferable to satisfy.
- the groove width W is preferably 0.4 mm or more.
- the radiator is preferably made of aluminum or an aluminum alloy having a thermal conductivity of 170 W / mK or more
- the metal base plate is made of aluminum having a thermal conductivity of 170 W / mK or more
- the metal circuit board is preferably an aluminum alloy or aluminum alloy having a thermal conductivity of 170 W / mK or more.
- the bonding between the ceramic substrate and the metal circuit board, the bonding between the ceramic substrate and the metal base plate, and the bonding between the metal base plate and the radiator may be performed by a molten metal bonding method or a brazing bonding method.
- the surface roughness of the metal base plate on the radiator joint side is preferably Ra 1.0 to 2.0 ⁇ m in order to improve the braze bondability.
- Ra 0.3 to 2.0 ⁇ m may be used.
- the surface roughness of the radiator may be such that it can be obtained with a general extruded material and plate material.
- the partition plate of the perforated pipe may be buckled.
- a metal circuit board made of aluminum or an aluminum alloy is bonded to one surface of the ceramic substrate, and one surface of a flat metal base plate made of aluminum or an aluminum alloy is bonded to the other surface. Is bonded to the other surface of the metal base plate, and a liquid-cooled integrated board is bonded to the other surface of the metal base plate, the metal circuit plate and the metal base.
- the plate and the ceramic substrate are bonded by a molten metal bonding method, and the metal base plate and the radiator are bonded by a brazing bonding method.
- the thickness t1 of the metal circuit plate and the thickness of the metal base plate A method for manufacturing a liquid-cooled integrated substrate is provided in which the relationship of the length t2 is formed to a thickness satisfying the following formula (1). t2 / t1 ⁇ 2 (1)
- the thickness t1 of the metal circuit board is preferably 0.4 to 3 mm, and the thickness t2 of the metal base board is preferably 0.8 to 6 mm.
- the metal base plate and the radiator may be brazed and joined by heating after pressurizing with a surface pressure equal to or greater than formula (2).
- Surface pressure (N / mm 2 ) ⁇ 1.25 ⁇ 10 ⁇ 3 ⁇ (secondary moment of heat sink cross section) +2.0 (2)
- the radiator is a porous tube, and the relationship between the groove width W (mm) and the groove depth D (mm), which is the flow path of the refrigerant in the porous tube, 3.3W ⁇ D ⁇ 10W
- the relationship between the groove width W (mm) which is the flow path of the refrigerant of the porous tube and the width T (mm) of the partition plate ⁇ W + 1.4 ⁇ T / W ⁇ 1.5W + 3.3 (when 0.4 ⁇ W ⁇ 1.0) -0.2W + 0.7 ⁇ T / W ⁇ -1.5W + 3.3 (when 1.0 ⁇ W ⁇ 2.0)
- the groove width W is preferably 0.4 mm or more.
- the metal base plate and the radiator are applied so that the partition plate surface pressure applied to the partition plate of the porous tube is ⁇ 0.5 ⁇ D (groove depth) +10 (MPa) or less. It is preferable to braze and join by heating after pressing.
- the radiator is preferably made of aluminum or an aluminum alloy having a thermal conductivity of 170 W / mK or more, and the metal base plate has a thermal conductivity of 170 W / m.
- the metal circuit board is aluminum or an aluminum alloy having a thermal conductivity of 170 W / mK or more.
- a liquid-cooled integrated type that suppresses raw material costs and processing costs, reduces warpage (shape deformation) as an integrated substrate, has excellent reliability against thermal shock, and has excellent strength and heat dissipation.
- a substrate and a method for manufacturing the liquid-cooled integrated substrate are provided.
- FIG. 2 is a side sectional view of the liquid-cooled integrated substrate 1.
- FIG. 3 is a perspective view of the liquid cooling integrated substrate 1 and a lid member 40.
- FIG. It is side surface sectional drawing of the liquid cooling integrated substrate 1 at the time of making the structure of the heat radiator 30 different.
- FIG. 4 is a perspective view of the liquid cooling integrated substrate 1 and the lid member 40 of FIG. 3.
- It is sectional drawing which shows the perforated pipe
- Example 3 It is a test result of Example 3, and it is a graph which shows the relationship between the cross-sectional secondary moment and curvature amount by the brazing direction of a small heat sink (sample). It is a graph which shows the relationship between the cross-sectional secondary moment and the amount of curvature of the brazing test of the large radiating board performed in Example 4. It is the graph which compared the curvature amount per unit length with respect to a surface pressure of the large radiating board performed in Example 4, and a small radiating board. It is a graph which shows the relationship between the cross-sectional secondary moment of the aluminum material obtained in Example 4, surface pressure, and curvature amount. It is a graph which shows the relationship between the groove width and groove depth obtained in Example 5, and performance.
- FIG. 1 is a side sectional view of a liquid-cooled integrated substrate 1 according to an embodiment of the present invention.
- a ceramic substrate 10 that is, for example, an AlN substrate (aluminum nitride substrate) or a SiN substrate (silicon nitride substrate).
- a metal circuit board 15 made of an aluminum alloy containing at least one element selected from Mg, Zn, Bi, and Sn is bonded, and aluminum or Si is attached to the lower surface (lower part in FIG. 1) of the ceramic substrate 10.
- a metal base plate 20 made of an aluminum alloy containing at least one element selected from Mg, Zn, Bi, and Sn is joined.
- a hollow prism-shaped radiator 30 formed of an extruded material is joined to the lower surface (lower side in FIG. 1) of the metal base plate 20.
- the extruded material refers to a member that is integrally formed by extrusion.
- the ceramic substrate 10 and the metal circuit board 15 and the ceramic substrate 10 and the metal base plate 20 are joined by a molten metal joining method, and the metal base plate 20 and the radiator 30 are joined. These are joined by the brazing method. That is, in joining the metal base plate 20 and the radiator 30, a brazing material layer 33 for joining is formed in the gap portion 31.
- a brazing material layer 33 for joining is formed in the gap portion 31.
- the objects to be joined need to have a thickness greater than a predetermined thickness (a thickness that can withstand brazing), and in this case, in particular, the upper surface of the radiator 30 (the surface to be joined). ) Must be sufficiently secured (for example, 0.5 mm or more).
- the radiator 30 has a hollow inner space, and a partition plate 35 for partitioning the inner space is provided.
- a partition plate 35 is provided so as to divide the internal space into 14 locations as shown in the figure, and a plurality (14 locations) of the interior space of the radiator 30 are provided by the partition plates 35.
- a flow path 38 is formed.
- the heat radiator 30 provided with the partition plate 35 is manufactured as an integral body by extrusion.
- FIG. 3 is a cross-sectional view of the liquid-cooled integrated substrate 1 according to a modification of the present invention when the configuration (cross-sectional shape) of the radiator 30 is different in the liquid-cooled integrated substrate 1.
- the internal space of the radiator 30 is partitioned into seven flow paths 38 by a partition plate 35, and the coolant is circulated in the flow path 38 as in the above embodiment.
- the heat radiator 30 provided with the partition plate 35 is manufactured as an integral body by extrusion.
- FIGS. 2 and 4 are perspective views of the liquid-cooled integrated substrate 1 and the lid member 40.
- FIG. The lid member 40 is a member that is attached so as to cover the side surface 30a of the opening on the near side of the radiator 30 (the near side in FIGS. 2 and 4).
- the lid member 40 is a side surface of the lid portion 41 and the lid portion 41.
- the liquid circulation port 45 (45a, 45b) is provided at two locations (surface corresponding to the side surface 30a when attached to the radiator 30).
- a similar lid member is attached to the opening provided on the opposite side of the opening on the near side in FIGS. 2 and 4 except that the liquid circulation port (not shown) is not provided.
- the lid member 40 is actually attached to the radiator 30 when liquid cooling is performed by heat generation of, for example, a semiconductor element attached to the metal circuit board 15 in the liquid cooling integrated substrate 1.
- a coolant circulation mechanism (not shown) is connected to the fluid circulation port 45 (45a, 45b), and the coolant is supplied from the coolant circulation mechanism to the inside of the radiator 30 (flow path 38) via the fluid circulation port 45a. Coolant is discharged from the radiator 30 to the coolant circulation mechanism via the liquid circulation port 45b. That is, the coolant circulates between the radiator 30 and the coolant circulation mechanism such that the coolant flows into the flow path 38 by the operation of the coolant circulation mechanism and then returns to the coolant circulation mechanism again.
- the cooling capacity of the radiator 30 is kept constant.
- the lid member 40 and the radiator 30 may be brazed at the same time when the metal base 20 and the radiator 30 are brazed.
- the relationship between the height t1 of the metal circuit board 15 and the height t2 of the metal base board 20 is expressed by the following equation (1). Yes. (For example, see FIGS. 1 and 3) t2 / t1 ⁇ 2 (1) Further, as values at this time, t1 is 0.4 to 3 mm, and t2 is 0.8 to 6 mm. It is desirable that the relationship between the height t1 of the metal circuit board 15 and the height t2 of the metal base plate 20 is as shown in the above (1). This is to suppress warping of the body substrate.
- t1 is 0.4 to 3 mm and t2 is 0.8 to 6 mm in order to obtain sufficient heat dissipation of transient heat and to suppress warpage of the integrated substrate. It is more preferable that t1 is 0.4 to 1.0 mm and t2 is 0.8 to 2 mm.
- the material of the radiator 30 is preferably aluminum having a thermal conductivity of 170 W / mK or higher, or an aluminum alloy containing at least one element selected from Si, Mg, Zn, Bi, and Sn.
- the surface roughness of the metal circuit board 15 is preferably about Ra 0.3 to 2.0 ⁇ m in order to improve solder wettability for mounting the device.
- the surface roughness of the radiator 30 may be such that it can be obtained with general extruded materials and plate materials.
- the surface roughness of the metal base plate 20 on the side where the radiator 30 is bonded is preferably Ra 1.0 to 2.0 ⁇ m in order to improve brazing. When the radiator 30 and the metal base plate 20 are joined by the melt joining method, Ra 0.3 to 2.0 ⁇ m can be sufficiently joined.
- the heat generated from the electronic component is As described above, the heat is radiated by the radiator 30 in which the coolant circulates, and the entire liquid-cooled integrated substrate 1 is cooled.
- the relationship between the height t1 of the metal circuit board 15 and the height t2 of the metal base board 20 is expressed by the following equation (1), t2 / t1 ⁇ 2 (1)
- the material of the metal circuit board 15, the metal base board 20 and the radiator 30 contains aluminum having a thermal conductivity of 170 W / mK or more, or at least one element selected from Si, Mg, Zn, Bi and Sn.
- the liquid-cooled integrated substrate 1 having sufficient strength and reliability (such as thermal shock resistance) as the integrated substrate can be obtained. Furthermore, joining reliability is sufficiently ensured by joining each member using the molten metal joining method or the brazing joining method.
- the radiator 30 is made of an extruded material made of aluminum or aluminum alloy having a thermal conductivity of 170 / mK or more, heat dissipation is good, and the radiator 30 is machined by cutting into a fin shape or the like. Compared to the above, the occurrence of warpage (shape deformation) in the radiator 30 is suppressed, and the liquid cooling integrated substrate 1 that is excellent in terms of raw material costs and processing costs is manufactured because it is integrally formed by extrusion. Is possible.
- the metal base plate 20 and the radiator 30 are joined by brazing as described above. Brazing is performed by setting a brazing material between the metal base plate 20 and the radiator 30, applying a predetermined load, and heating to a predetermined brazing temperature in a brazing furnace.
- Surface pressure (Load applied during setting before brazing heating) / (Area of metal base plate) The surface pressure was set to the following formula (2) or more.
- Surface pressure (N / mm 2 ) ⁇ 1.25 ⁇ 10 ⁇ 3 ⁇ (secondary moment of the radiator cross section) +2.0 (2)
- the cross-sectional secondary moment of the radiator 30 is calculated
- the depth dimension D (mm) of each groove (coolant flow path 38) of the radiator 30 is set to the width dimension W (mm) of each groove.
- 3.3W ⁇ D ⁇ 10W It is the range of this, and it makes the suitable thermal performance and extrudability compatible.
- the width W (mm) and the width T (mm) of the partition plate are ⁇ W + 1.4 ⁇ T / W ⁇ 1.5W + 3.3 (when 0.4 ⁇ W ⁇ 1.0) -0.2W + 0.7 ⁇ T / W ⁇ -1.5W + 3.3 (when 1.0 ⁇ W ⁇ 2.0) Satisfying the requirements makes it possible to achieve both suitable thermal performance and extrudability.
- the configuration (cross-sectional shape) of the radiator 30 is such that the partition plate 35 divides the internal space of the radiator 30 into 14 or 7 locations.
- the number of formations can be arbitrarily set, and is preferably determined as appropriate so that the heat dissipation property (cooling efficiency) of the radiator 30 is suitable.
- Example 1 A liquid-cooled integrated substrate was produced according to the present invention, and the product was evaluated.
- an AlN substrate is prepared as the ceramic substrate 10, and a metal circuit board 15 is bonded to one surface thereof, and a metal base plate 20 is bonded to the other surface thereof by molten metal bonding. Registration) substrate).
- the sizes of the ceramic substrate 10, the metal circuit board 15, and the metal base board 20 are as shown in Table 1. Examples 1, 2, and 3 of the present invention based on the present invention, and Comparative examples 1 and 2 outside the scope of the present invention. A sample of was prepared. The material of the metal circuit board and the metal base board was 0.4 mass% Si-0.04 mass% B-balance Al. The metal circuit board 15 and the metal base board 20 were joined to the center of the ceramic substrate 10 respectively. In Comparative Examples 1 and 2, the portions outside the scope of the present invention are underlined.
- each metal-ceramic bonding substrate shown in Table 1 is bonded to each radiator through a brazing material.
- a body substrate was produced.
- the external dimensions of the radiator 30 are 122 mm ⁇ 90 mm ⁇ 8 mm, the thickness of the upper plate and the lower plate is 1 mm, the flow path 38 is 6 mm in height (height of the partition plate), 1.5 mm in width, rib width (the partition plate) The width is 0.7 mm.
- the four metal-ceramic bonding substrates were bonded to the center of the position where the upper surface (top plate) of the radiator 30 was divided into four. Also, the brazing between the metal base plate 20 and the radiator 30 was held in a vacuum at 600 ° C. for 10 minutes, and the brazing material was A4045.
- Evaluation of the liquid-cooled integrated substrate was performed with respect to solder and cracks at each joint interface, a heat shock test, and a warped shape of the upper surface of the radiator.
- solder and cracks at each joint interface were inspected with an ultrasonic flaw detector.
- the semiconductor chip was joined via the eutectic solder on the metal circuit board of a liquid cooling integrated substrate, and was evaluated.
- the heat shock test was performed using a liquid bath thermal shock device, and the process of holding at ⁇ 40 ° C. for 2 minutes and then holding at 110 ° C. for 2 minutes was repeated as one cycle.
- the solder cracks were evaluated by determining the area ratio of the solder cracks with an ultrasonic flaw detector at the initial stage, after 1000 cycles of heat shock, after 2500 cycles, and after 4000 cycles.
- the length of the most developed part of the crack extending from the metal base plate edge surface of the metal-ceramic joint substrate to the joint interface after 4000 cycles of heat shock was evaluated by an ultrasonic flaw detector. It was. In addition, the length of the crack was confirmed also by cross-sectional observation of the sample.
- the warped shape (warpage amount) of the porous tube is the difference between the height of the center and the end of the porous tube, and measured using a three-dimensional warpage measuring device after joining, soldering, and after 4000 cycles of heat shock, The difference in warpage after joining and after 4000 cycles was determined.
- Table 2 shows the evaluation results of the sample in which the cracks were most developed among the four metal-ceramic bonding substrates bonded to each radiator by the above evaluation method.
- the portion inferior in characteristics as compared with Inventive Examples 1, 2, and 3 produced based on the present invention is underlined.
- the comparative example in which the ratio t1 / t2 between the thickness t1 of the metal circuit board and the thickness t2 of the metal base board is smaller than the range of the present invention was vulnerable to heat shock, and many cracks occurred.
- Example 2 A basic test for manufacturing a liquid-cooled integrated substrate by brazing was performed using a heat dissipation substrate “Aluminac” (registered trademark) in which an aluminum alloy was melt-bonded (directly bonded) to both surfaces of an AlN substrate.
- AlN substrate a heat dissipation substrate “Aluminac” (registered trademark) in which an aluminum alloy was melt-bonded (directly bonded) to both surfaces of an AlN substrate.
- the radiator composed of a perforated tube has a large number of refrigerant flow tubes arranged continuously, and the groove width W (tube width) of the refrigerant flow channel is 1.515 mm.
- Depth D pipe height
- partition plate width rib thickness, radiating fin thickness
- upper plate (top plate) and lower plate (bottom plate) are It was 1.01 mm.
- a metal circuit board made of an aluminum alloy has a length of 15.7 mm ⁇ width of 26.4 mm ⁇ thickness of 0.6 mm (t1), and a ceramic substrate has a length of 18.1 mm.
- X width 28.8 mm x thickness 0.64 mm, and the size of the metal base plate 20 made of an aluminum alloy was 15.7 mm long x 26.4 mm wide x 1.6 mm thick (t2).
- a small heat dissipation board having the same configuration was prepared except that the thickness (t2) of the metal base plate 20 was 0.6 mm.
- the material of the metal circuit board and the metal base board was 0.4 mass% Si-0.04 mass% B-balance Al. Note that each of the metal circuit board and the metal base board of the small heat dissipation board is a rectangular parallelepiped (plate shape), and is arranged and bonded to the center of the ceramic substrate.
- a brazing material (composition: 10 mass% Si-1 mass% Mg—balance Al, thickness) on the radiator is the same size (length and width) as the aluminum part of the metal base plate of the small heat dissipation board. 15 ⁇ m), place a heat dissipation board on the brazing material, and set a “Inconel” (registered trademark) disc spring on it via a jig. A predetermined load (surface pressure) is applied. Tightened with bolts. Next, after setting in a brazing furnace in a nitrogen atmosphere, the temperature is raised to 500 ° C. at 50 ° C./min, up to 605 ° C.
- the amount of warpage (26.4 mm in the longitudinal direction) of the metal circuit board surface of the heat dissipation board was measured. The results are shown in Table 1. In addition, the amount of curvature measured the difference of the height of the edge part and center part of a metal circuit board with the three-dimensional surface roughness meter.
- the target warp amount is 60 ⁇ m or less, preferably 50 ⁇ m or less.
- Example 3 As shown in FIG. 5, a large number of refrigerant flow pipes are continuously arranged, the groove width W (pipe width) of the refrigerant flow path is 1.515 mm, and the groove depth D (pipe height). 110 mm (extrusion direction) for a porous tube having a thickness of 6.06 mm, a partition plate width (rib thickness, radiating fin thickness) T of 0.707 mm, and a top plate and a bottom plate of 1.01 mm each. A radiator made of a perforated tube was cut into ⁇ 135 mm, and pipes with a diameter of 18 mm (inner diameter: 16 mm) were brazed on both sides as a lid.
- the coolant is supplied from one pipe by a coolant circulation mechanism (not shown), passes through the porous tube, and is discharged from the other pipe.
- a small heat radiating substrate (15.7 mm ⁇ 26.4 mm ⁇ 0.6 mm as a metal circuit plate made of an aluminum alloy, and 15.7 mm ⁇ 26.4 mm ⁇ 0.00 mm as a metal base plate made of an aluminum alloy.
- Ceramics (AlN substrate) 18.1 mm ⁇ 28.8 mm ⁇ 0.64 mm
- the material of the metal circuit board 15 and the metal base board 20 was 0.4 mass% Si-0.04 mass% B-balance Al.
- the load at this time was 3500 N, that is, the surface pressure was 2.1 N / mm 2 .
- the brazing conditions were the same as in Example 2, but flux was applied to the brazing between the perforated pipe and the pipe.
- the porous tube and the small heat dissipation substrate, and the porous tube and the pipe were joined at the same time.
- the longitudinal direction of the small heat dissipation substrate (5-1, 5-2, 5-3, 5-4) is parallel to the partition plate of the porous tube (the direction of the refrigerant flow path).
- the small heat dissipation board (6-1, 6-2, 6-3, 6-4) in the longitudinal direction are porous as shown in FIG. 9B.
- the measurement result of the curvature amount of these metal circuit board surfaces is shown in FIG.
- the amount of warpage is the metal circuit board surface in the X direction (parallel to the partition plate), the metal circuit board surface in the Y direction (perpendicular to the partition board), and the metal in the diagonal direction (diagonal direction of the metal circuit board).
- the circuit board surface was measured with a three-dimensional surface roughness meter as the difference in height between the edge and the center of the metal circuit board.
- the target warpage amount is 50 ⁇ m or less.
- FIG. 11 shows the results of calculating the sectional moments in the X direction and the Y direction, respectively, and further calculating the amount of warpage per unit length. As shown in FIG. 11, it can be seen that even when the direction of the partition plate is different and the secondary moment changes, the amount of warpage is distributed on the same line, and the sectional secondary moment is appropriate as an influencing factor on the amount of warpage. It has been found.
- radiators there are two types of radiators, 40 mm long ⁇ 40 mm wide ⁇ 4 mm thick plate material, 40 mm long ⁇ 40 mm wide ⁇ 8 mm thick plate material made of A1100 material, and 40 mm long ⁇ width shown in FIG.
- a radiator made of a porous tube (material: A6063 alloy) of 40 mm ⁇ 8.08 mm thickness was prepared.
- a heat sink composed of a perforated tube has a large number of refrigerant flow tubes arranged in a row, and the groove width W (tube width) that is the refrigerant flow channel is 1.515 mm and the groove depth.
- D (height of the tube) was 6.06 mm
- the width of the partition plate (radiation fin thickness, rib thickness) was 0.707 mm
- the thicknesses of the top plate and the bottom plate were 1.01 mm, respectively.
- the dimension of the metal circuit board made of an aluminum alloy is 27.4 mm long ⁇ 32.4 mm wide ⁇ 0.6 mm thick (t1), and the size of the ceramic substrate is 28.8 mm.
- a large heat radiating board having dimensions of 38.8 mm ⁇ 0.64 mm and a metal base plate 20 made of an aluminum alloy having a length of 27.4 mm, a width of 32.4 mm, and a thickness of 1.6 mm (t2) was prepared.
- the material of the metal circuit board 15 and the metal base board 20 was 0.4 mass% Si-0.04 mass% B-balance Al.
- a brazing material having the same size (length and width) as the aluminum part of the metal base plate of the heat radiating board (composition: 10 mass% Si-1 mass% Mg-balance Al, thickness 15 ⁇ m) ) was set, and a heat dissipation board was placed on the brazing material and brazed.
- the conditions for brazing are the same as in Example 2 except for the surface pressure.
- the warpage amount (32.4 mm direction) of the surface of the metal circuit board of the large heat dissipation board obtained at this time was measured in the same manner as in Example 2. The test was performed by setting the load during brazing in two ways: 1150 N (surface pressure 1.31 N / mm 2 ) and 1600 N (surface pressure 1.82 N / mm 2 ).
- FIG. 13 shows the relationship between the surface pressure and the amount of warping when the small heat radiating board and the large heat radiating board are brazed to the heat radiating element made of an aluminum plate having a thickness of 4 mm and the heat radiating element made of a perforated tube. Show. Since the size of the heat radiating substrate is different, the value of warpage is divided by the size of the heat radiating substrate. As is clear from FIG.
- FIG. 14 shows the result of combining the result of the large heat dissipation board with FIG. 8 which is the result of the small heat dissipation board.
- the warpage amount of the large heat dissipation board was corrected to the warpage amount of the small heat dissipation board. That is, the amount of warpage was evaluated by a value obtained by dividing the amount of warpage of the large heat dissipation substrate by 1.18 (32.4 / 27.4).
- the result of the large heat dissipation substrate almost coincided with the result of the small heat dissipation substrate. That is, it has been found that the formula (2) can be applied even if the size of the heat dissipation substrate changes.
- Example 5 The size of the radiator is 50 mm x 70 mm, and thermal analysis is performed by changing the groove width W, groove depth D, and partition plate width T (see Fig. 5) of the porous tube used as the radiator, and a suitable groove width.
- the relationship between W and groove depth D, and groove width W and partition plate width T / groove width W ratio was determined. Furthermore, the extrusion limit in the production of the perforated tube was determined.
- FIG. 15 shows the relationship between the groove width W and the groove depth D.
- D 3.3W Is a lower limit for suitable thermal performance, and below this (when D is less than 3.3 W), thermal performance decreases.
- D 10W Is the upper limit which becomes the limit of extrusion processing, and if it exceeds this, that is, D is larger than 10 W, extrusion cannot be performed.
- the relationship between the groove width W and the partition plate width T / groove width W ratio is shown in FIG. As shown in FIG.
- the upper limit indicated by is the limit at which the thermal performance is suitable, and if it exceeds this, the thermal performance will decrease. As shown in FIGS. 15 and 16, it was found that the dimensions of the groove width W, the groove depth D, and the width T of the partition plate are limited from the thermal performance and the extrusion limit.
- the lower limit at which the thermal performance is suitable is set in consideration of heat dissipation when a power semiconductor chip such as an IGBT is mounted on a metal circuit board.
- the load applied to the heat dissipation substrate is applied to the partition plates (ribs, heat dissipation fins).
- the dimensions of the metal circuit board and the metal base plate made of an aluminum alloy are 15.7 mm long ⁇ 26.4 mm wide, the dimensions of the ceramic substrate are 18.1 mm long ⁇ 28.8 mm wide ⁇ 0.64 mm thick,
- the thickness t1 of the metal circuit board 15 and the thickness t2 of the metal base board 20 are 0.6 mm (t1) and 1.6 mm (t2), respectively, and a porous tube (40 mm ⁇ 40 mm ⁇ 8) having the dimensions shown in FIG.
- the material of the metal circuit board 15 and the metal base board 20 was 0.4 mass% Si-0.04 mass% B-balance Al.
- Fig. 17 shows the groove depth after brazing and the deformation state of the partition plate.
- the partition plate At a surface pressure of 7.4 MPa, the partition plate was greatly deformed (buckled), and the groove depth was reduced by 0.3 mm.
- the surface pressure was 5.7 MPa, the deformation of the partition plate was reduced, and the groove depth was reduced by 0.15 mm.
- the surface pressure was 2.3 MPa, the deformation of the partition plate was very small, and no change was observed in the groove depth.
- the surface pressure is 7.3 MPa
- the flow of the cooling water becomes unstable and the thermal performance slightly decreases, but it is within an allowable range.
- the critical surface pressure varies with the overall height.
- the thermal performance affects the cooling when the semiconductor chip is mounted on the metal circuit board. Since it decreases to such an extent that it appears, the groove width at which the amount of deformation of the partition plate is 10% or less was determined using that as an index. The result is shown in FIG. The width of the partition plate at that time was fixed at 1.0 mm. As the groove width decreases, the number of partition plates increases. As is apparent from FIG. 18, the load (limit load) at which the partition plate deforms by 10% increases as the groove width decreases. Also, the limit load decreases as the height of the perforated tube increases.
- the critical load at each groove width was obtained, and the value obtained by dividing the load by the partition plate area was defined as the critical surface pressure (MPa).
- MPa critical surface pressure
- the critical surface pressure has a good correlation with the overall height of the porous tube.
- the critical surface pressure decreases as the groove width increases, the critical surface pressure was determined with a small groove width of 1.0 mm.
- the critical surface pressure at which the thermal performance does not deteriorate is obtained by -0.5 ⁇ D (groove depth, partition plate height) +10. Cooling with no deformation of the partition plate by setting a surface pressure lower than that. Can be obtained. If more surface pressure is applied, the buckling of the partition plate further increases and the change in the groove width W1 increases. Therefore, the surface pressure of the partition plate is set to ⁇ 0.5 ⁇ D (groove depth, partition plate height). S) +10 (MPa) or less. On the other hand, in the case of a large heat dissipation board, the partition plate was not deformed under a load of 1100 N (surface pressure of 4.1 MPa).
- the buckling of the partition plate is considered to have the effect of reducing the amount of warping of the metal circuit board. Therefore, as described above, if the amount of deformation is within 10%, the thermal performance is not deteriorated, but rather is positively buckled. You can use the crook.
- the present invention is applied to a metal / ceramic bonding substrate, and in particular, a metal circuit board and a metal base plate made of aluminum or an aluminum alloy are bonded to both surfaces of the ceramic substrate, respectively, and the metal base plate is not bonded to the ceramic substrate.
- the present invention is applied to a liquid-cooled integrated substrate to which a radiator is joined and a manufacturing method thereof.
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Abstract
Description
t2/t1≧2・・・(1)
前記金属回路板の厚さt1は0.4~3mmであり、前記金属ベース板の厚さt2は0.8~6mmである、液冷一体型基板が提供される。
3.3W<D<10W
を満たすことが好ましく、前記多孔管の冷媒の流路である溝幅W(mm)と仕切り板の幅T(mm)との関係が、
-W+1.4<T/W<-1.5W+3.3 (0.4≦W≦1.0の場合)
-0.2W+0.7<T/W<-1.5W+3.3 (1.0<W<2.0の場合)
を満たすことが好ましい。さらに、前記溝幅Wが0.4mm以上であることが好ましい。
t2/t1≧2・・・(1)
面圧(N/mm2)=-1.25×10-3×(放熱器の断面2次モーメント)+2.0・・・(2)
3.3W<D<10W
を満たすことが好ましく、前記多孔管の冷媒の流路である溝幅W(mm)と仕切り板の幅T(mm)との関係が、
-W+1.4<T/W<-1.5W+3.3 (0.4≦W≦1.0の場合)
-0.2W+0.7<T/W<-1.5W+3.3 (1.0<W<2.0の場合)
を満たすことが好ましい。さらに、前記溝幅Wが0.4mm以上であることが好ましい。
t2/t1≧2・・・(1)
また、この時の各値としては、t1が0.4~3mmであり、t2が0.8~6mmである。金属回路板15の高さt1と、金属ベース板20の高さt2の関係が上記(1)に示すような関係であることが望ましいのは、充分な過渡熱の放熱性を得ること、一体型基板の反りを抑制するためである。また、t1が0.4~3mmであり、t2が0.8~6mmであることが望ましいのは、充分な過渡熱の放熱性を得ること、一体型基板の反りを抑制するためである。なお、t1が0.4~1.0mm、t2が0.8~2mmであることがさらに好ましい。
t2/t1≧2・・・(1)
各値を、それぞれt1が0.4~3mmであり、t2が0.8~6mmであるとしたことにより、十分な放熱性を発揮する液冷一体型基板1が得られることとなる。
面圧=(ろう付けの加熱前のセット時に負荷する荷重)/(金属ベース板の面積)
とし、この面圧を、下記(2)式以上とした。
面圧(N/mm2)=-1.25×10-3×(放熱器の断面2次モーメント)+2.0・・・(2)
尚、放熱器30の断面2次モーメントは、次式から求める。
仕切り板の平行方向に垂直な放熱器の断面の場合は、
BH3/12-((溝幅)×本数×D3)/12
仕切り板の垂直方向に垂直な放熱器の断面の場合は、
BH3/12-(B×D3)/12
ただし、B:放熱器と金属ベース板の接合部の幅,H:放熱器の高さ,D:放熱器における多孔管の溝深さ(仕切り板の高さ)、T:仕切り板の幅
ろう付け時の面圧を、金属ベース板20の剛性に対して(2)式以上とすることにより、反り量が低減された一体型基板を得ることができる。
3.3W<D<10W
の範囲であることが、好適な熱性能と押出し性を両立させる。さらに、幅W(mm)と仕切り板の幅T(mm)とが、
-W+1.4<T/W<-1.5W+3.3 (0.4≦W≦1.0の場合)
-0.2W+0.7<T/W<-1.5W+3.3 (1.0<W<2.0の場合)
を満たすことで、好適な熱性能と押出し性を両立させることができる。
仕切り板の面圧=(ろう付け時に放熱器30に負荷する荷重)/(放熱器30の仕切り板の面積)
とし、仕切り板の面圧を、-0.5×D(溝深さ)+10(MPa)以下とすることにより、放熱器の仕切り板の座屈を低減させることができる。ただし、仕切り板の面積は、仕切り材35を上板に平行な平面で切断したときの仕切り板の断面積を指す。
本発明に従って液冷一体型基板を作製し、製品の評価を行った。
AlN基板の両面にアルミニウム合金が溶湯接合(直接接合)された放熱基板「アルミック」(商標登録)を用いて、ろう付けにより液冷一体型基板を製作するための基礎試験を行った。
面圧(N/mm2)=-1.25×10-3×(放熱器の断面2次モーメント)+2.0・・・(2)
反り量の目標を50μmとすれば、(2)式を満足すれば、目標を達成できる。
図5に示すような、多数の冷媒の流路の管が連続して並んでおり、冷媒の流路である溝幅W(管の幅)が1.515mm、溝深さD(管の高さ)が6.06mm、仕切り板の幅(リブ厚さ、放熱フィン厚さ)Tが0.707mm、天板と底板の厚さがそれぞれ1.01mmである多孔管を、110mm(押出方向)×135mmに切断して多孔管からなる放熱器とし、その両側にφ18mm(内径16mm)のパイプを、蓋材としてろう付けした。図示しない冷却液循環機構により、冷媒は一方のパイプから供給され、多孔管を通過して他方のパイプから排出される構造となっている。また、多孔管の表面に、小型放熱基板(アルミ合金からなる金属回路板として15.7mm×26.4mm×0.6mm、アルミ合金からなる金属ベース板として15.7mm×26.4mm×0.6mm、セラミックス(AlN基板)18.1mm×28.8mm×0.64mm)を4枚ろう付けした。金属回路板15および金属ベース板20の材質は、0.4mass%Si-0.04mass%B-残部Alとした。このときの荷重を3500N、すなわち面圧を2.1N/mm2とした。ろう付け条件は実施例2と同様であるが、多孔管とパイプとのろう付けにはフラックスを塗布した。多孔管と小型放熱基板、および多孔管とパイプは同時に接合した。図9(a)に示すように小型放熱基板(5-1、5-2、5-3、5-4)の長手方向が多孔管の仕切り板に対して平行方向(冷媒の流路の方向)に沿ってろう付けしたタイプ(平行タイプと称す)と、図9(b)に示すように小型放熱基板(6-1、6-2、6-3、6-4)の長手方向が多孔管の仕切り板に対して垂直方向(冷媒の流路に直角方向)にろう付けしたタイプ(垂直タイプと称す)を試作した。これらの金属回路板表面の反り量の測定結果を図10に示す。反り量は、X方向(仕切り板に対して平行方向)の金属回路板表面、Y方向(仕切り板に対して垂直方向)の金属回路板表面、斜め方向(金属回路板の対角線方向)の金属回路板表面について、いずれも金属回路板の端部と中央部の高さの差として3次元表面粗さ計で測定した。
次に、長さ40mm×幅40mm×厚さ4mmの板材、長さ40mm×幅40mm×8mmの板材の2種類の、材質がA1100材からなる放熱器と、図5に示す長さ40mm×幅40mm×厚さ8.08mmの多孔管(材質:A6063合金製)からなる放熱器を準備した。多孔管からなる放熱器には図5の通り多数の冷媒の流路の管が連続して並んでおり、冷媒の流路である溝幅W(管の幅)が1.515mm、溝深さD(管の高さ)が6.06mm、仕切り板の幅(放熱フィン厚さ、リブ厚さ)が0.707mm、天板と底板の厚さがそれぞれ1.01mmであった。
放熱器の大きさを50mm×70mmとし、放熱器として用いる多孔管の溝幅W、溝深さD、仕切り板の幅T(図5参照)を変化させて熱解析を行い、好適な溝幅Wと溝深さD、及び溝幅Wと仕切り板の幅T/溝幅W比との関係を求めた。さらに、多孔管の製造における押出し限界を求めた。
D=3.3W
は、熱性能が好適となる下限であり、これより下方(Dが3.3Wより小さい場合)では熱性能が低下する。また、
D=10W
は、押出し加工の限界となる上限であり、これを超えるすなわちDが10Wより大きいと、押出しができない。さらに、溝幅Wと仕切り板の幅T/溝幅W比の関係を図16に示す。図16に示すように、
-W+1.4=T/W (0.4≦W≦1.0の場合)
-0.2W+0.7=T/W (1.0<W<2.0の場合)
で示される下限は押出し加工の限界であり、
T/W=-1.5W+3.275
で示される上限は熱性能が好適となる限界で、これを超えると熱性能が低下する。図15および図16に示すように、熱性能と押出し限界から、溝幅W、溝深さD、仕切り板の幅Tの寸法に制約があることがわかった。なお、熱性能が好適となる下限は、金属回路基板にたとえばIGBTなどのパワー半導体チップを搭載したときの放熱性を考慮して設定したものである。
Claims (22)
- セラミックス基板の一方の面にアルミニウムまたはアルミニウム合金からなる金属回路板が接合されると共に、他方の面にアルミニウムまたはアルミニウム合金からなる平板状の金属ベース板の一方の面が接合され、前記金属ベース板の他方の面には押出し材で構成される液冷式の放熱器が接合された液冷一体型基板において、
前記金属回路板の厚さt1と前記金属ベース板の厚さt2の関係は次式(1)を満たし、
t2/t1≧2・・・(1)
前記金属回路板の厚さt1は0.4~3mmであり、前記金属ベース板の厚さt2は0.8~6mmである、液冷一体型基板。 - 前記放熱器は多孔管からなり、前記金属ベース板と前記放熱器とがろう付け接合されたことを特徴とする、請求項1に記載の液冷一体型基板。
- 前記多孔管の冷媒の流路である溝幅W(mm)と溝深さD(mm)との関係が、
3.3W<D<10W
を満たすことを特徴とする、請求項1に記載の液冷一体型基板。 - 前記多孔管の冷媒の流路である溝幅W(mm)と仕切り板の幅T(mm)との関係が、
-W+1.4<T/W<-1.5W+3.3 (0.4≦W≦1.0の場合)
-0.2W+0.7<T/W<-1.5W+3.3 (1.0<W<2.0の場合)
を満たすことを特徴とする、請求項3に記載の液冷一体型基板。 - 前記溝幅Wが0.4mm以上であることを特徴とする、請求項3に記載の液冷一体型基板。
- 前記放熱器は熱伝導率が170W/mK以上であるアルミニウムまたはアルミニウム合金からなる、請求項1に記載の液冷一体型基板。
- 前記金属ベース板は熱伝導率が170W/mK以上であるアルミニウムまたはアルミニウム合金である、請求項1に記載の液冷一体型基板。
- 前記金属回路板は熱伝導率が170W/mK以上であるアルミニウムまたはアルミニウム合金である、請求項1に記載の液冷一体型基板。
- 前記セラミックス基板と前記金属回路板との接合、前記セラミックス基板と前記金属ベース板との接合および前記金属ベース板と前記放熱器との接合は、溶湯接合法あるいはろう接合法によって行われる、請求項1に記載の液冷一体型基板。
- 前記多孔管の仕切り板が座屈している、請求項1に記載の液冷一体型基板。
- セラミックス基板の一方の面にアルミニウムまたはアルミニウム合金からなる金属回路板が接合されると共に、他方の面にアルミニウムまたはアルミニウム合金からなる平板状の金属ベース板の一方の面が接合され、前記金属ベース板の他方の面には押出し材で構成される液冷式の放熱器が接合された液冷一体型基板の製造方法であって、
前記金属回路板および前記金属ベース板と前記セラミックス基板との接合は溶湯接合法によって行われ、
前記金属ベース板と前記放熱器との接合はろう接合法によって行われ、
前記金属回路板の厚さt1と前記金属ベース板の厚さt2の関係は次式(1)を満たす厚さに形成される、液冷一体型基板の製造方法。
t2/t1≧2・・・(1) - 前記金属回路板の厚さt1は0.4~3mmであり、前記金属ベース板の厚さt2は0.8~6mmである、請求項11に記載の液冷一体型基板の製造方法。
- 前記金属ベース板と前記放熱器とを、(2)式以上の面圧で加圧した後に加熱してろう付け接合することを特徴とする、請求項11に記載の液冷一体型基板の製造方法。
面圧(N/mm2)=-1.25×10-3×(放熱器の断面2次モーメント)+2.0・・・(2) - 前記放熱器は多孔管からなり、前記多孔管の冷媒の流路である溝幅W(mm)と溝深さD(mm)との関係が、
3.3W<D<10W
を満たすことを特徴とする、請求項11に記載の液冷一体型基板の製造方法。 - 前記多孔管の冷媒の流路である溝幅W(mm)と仕切り板の幅T(mm)との関係が、
-W+1.4<T/W<-1.5W+3.3 (0.4≦W≦1.0の場合)
-0.2W+0.7<T/W<-1.5W+3.3 (1.0<W<2.0の場合)
を満たすことを特徴とする、請求項14に記載の液冷一体型基板の製造方法。 - 前記溝幅Wが0.4mm以上であることを特徴とする、請求項14に記載の液冷一体型基板の製造方法。
- 前記金属ベース板と前記放熱器とが、前記多孔管の仕切り板に負荷される仕切り板面圧が、-0.5×D(溝深さ)+10(MPa)以下となるように加圧した後に加熱してろう付け接合されたことを特徴とする、請求項14に記載の液冷一体型基板の製造方法。
- 前記放熱器は熱伝導率が170W/mK以上であるアルミニウムまたはアルミニウム合金からなる、請求項11に記載の液冷一体型基板の製造方法。
- 前記金属ベース板は熱伝導率が170W/mK以上であるアルミニウムまたはアルミニウム合金である、請求項11に記載の液冷一体型基板の製造方法。
- 前記金属回路板は熱伝導率が170W/mK以上であるアルミニウムまたはアルミニウム合金である、請求項11に記載の液冷一体型基板の製造方法。
- セラミックス基板の一方の面にアルミニウムまたはアルミニウム合金からなる金属回路板が接合されると共に、他方の面にアルミニウムまたはアルミニウム合金からなる平板状の金属ベース板の一方の面が接合され、前記金属ベース板の他方の面には押出し材で構成される液冷式の放熱器が接合された液冷一体型基板の製造方法であって、
前記金属回路板および前記金属ベース板と前記セラミックス基板との接合は溶湯接合法によって行われ、
前記金属ベース板と前記放熱器との接合はろう接合法によって行われ、
前記金属ベース板と前記放熱器とを、(2)式以上の面圧で加圧した後に加熱してろう付け接合することを特徴とする、液冷一体型基板の製造方法。
面圧(N/mm2)=-1.25×10-3×(放熱器の断面2次モーメント)+2.0・・・(2) - セラミックス基板の一方の面にアルミニウムまたはアルミニウム合金からなる金属回路板が接合されると共に、他方の面にアルミニウムまたはアルミニウム合金からなる平板状の金属ベース板の一方の面が接合され、前記金属ベース板の他方の面には押出し材で構成される液冷式の多孔管からなる放熱器が接合された液冷一体型基板において、
前記金属ベース板と前記放熱器とがろう付け接合されたことを特徴とする、液冷一体型基板。
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