WO2017154593A1 - 接続基板 - Google Patents
接続基板 Download PDFInfo
- Publication number
- WO2017154593A1 WO2017154593A1 PCT/JP2017/006820 JP2017006820W WO2017154593A1 WO 2017154593 A1 WO2017154593 A1 WO 2017154593A1 JP 2017006820 W JP2017006820 W JP 2017006820W WO 2017154593 A1 WO2017154593 A1 WO 2017154593A1
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- WO
- WIPO (PCT)
- Prior art keywords
- conductor
- main surface
- pores
- area ratio
- glass
- Prior art date
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- 239000000758 substrate Substances 0.000 title claims abstract description 87
- 239000011521 glass Substances 0.000 claims abstract description 85
- 239000004020 conductor Substances 0.000 claims abstract description 71
- 239000000919 ceramic Substances 0.000 claims abstract description 70
- 229910052751 metal Inorganic materials 0.000 claims abstract description 58
- 239000002184 metal Substances 0.000 claims abstract description 58
- 239000011148 porous material Substances 0.000 claims description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 239000000463 material Substances 0.000 description 11
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- 239000002585 base Substances 0.000 description 9
- 238000005498 polishing Methods 0.000 description 7
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- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 239000002002 slurry Substances 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
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- YIWUKEYIRIRTPP-UHFFFAOYSA-N 2-ethylhexan-1-ol Chemical compound CCCCC(CC)CO YIWUKEYIRIRTPP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
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- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical compound [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000005388 borosilicate glass Substances 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 1
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- 230000000052 comparative effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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- 229910052750 molybdenum Inorganic materials 0.000 description 1
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- 229910052763 palladium Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
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- 229920000642 polymer Polymers 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
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- 238000007650 screen-printing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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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
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49827—Via connections through the substrates, e.g. pins going through the substrate, coaxial cables
-
- 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
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/115—Via connections; Lands around holes or via connections
-
- 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
- H01L21/4846—Leads on or in insulating or insulated substrates, e.g. metallisation
- H01L21/486—Via connections through the substrate with or without pins
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/12—Mountings, e.g. non-detachable insulating substrates
- H01L23/13—Mountings, e.g. non-detachable insulating substrates characterised by the shape
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/12—Mountings, e.g. non-detachable insulating substrates
- H01L23/14—Mountings, e.g. non-detachable insulating substrates characterised by the material or its electrical properties
- H01L23/15—Ceramic or glass substrates
-
- 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
-
- 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
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
-
- 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
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
-
- 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
- H05K3/22—Secondary treatment of printed circuits
- H05K3/28—Applying non-metallic protective coatings
-
- 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
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
-
- 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
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/4038—Through-connections; Vertical interconnect access [VIA] connections
-
- 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
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/4038—Through-connections; Vertical interconnect access [VIA] connections
- H05K3/4053—Through-connections; Vertical interconnect access [VIA] connections by thick-film techniques
- H05K3/4061—Through-connections; Vertical interconnect access [VIA] connections by thick-film techniques for via connections in inorganic insulating substrates
-
- 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
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
- H05K3/4626—Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials
- H05K3/4629—Manufacturing multilayer circuits by laminating two or more circuit boards characterised by the insulating layers or materials laminating inorganic sheets comprising printed circuits, e.g. green ceramic sheets
-
- 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
-
- 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
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders; Supports
- H03H9/058—Holders; Supports for surface acoustic wave devices
-
- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/01—Dielectrics
- H05K2201/0104—Properties and characteristics in general
- H05K2201/0116—Porous, e.g. foam
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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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
- H05K2201/09745—Recess in conductor, e.g. in pad or in metallic substrate
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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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/11—Treatments characterised by their effect, e.g. heating, cooling, roughening
- H05K2203/1131—Sintering, i.e. fusing of metal particles to achieve or improve electrical conductivity
-
- 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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/11—Treatments characterised by their effect, e.g. heating, cooling, roughening
- H05K2203/1147—Sealing or impregnating, e.g. of pores
Definitions
- the present invention relates to an electrical connection substrate in which a through conductor such as a via conductor is formed in a through hole.
- a substrate for mounting an electronic device such as a SAW filter
- a substrate (via substrate) having a structure in which a through hole is provided in an insulating substrate such as ceramic and the hole is filled with a conductor to form a through electrode is used.
- insulating substrate such as ceramic
- the via substrate which is a component, is also required to be thin. It has been.
- the wiring on the substrate surface needs to be miniaturized for miniaturization, it is required to reduce the diameter of the through electrode and to increase the accuracy of the position. Furthermore, since these fine wirings are formed by photolithography or plating, it is particularly required that the through electrodes be dense and have high water tightness in order to prevent problems caused by the ingress of chemicals in the resist coating process and plating process. ing.
- Patent Document 1 discloses a method of preventing the resist solution from entering by forming a conductive protective film on the surface of a porous through electrode.
- the insulating substrate is thin, the air permeability of the through electrode is increased, so that the strength of the conductive protective film is insufficient and does not function as a protective film.
- Patent Document 2 discloses a method of filling a void with a second conductor after forming a porous first conductor as a through electrode.
- a ceramic substrate is used, cracks and warpage of the substrate are likely to occur when the substrate is thinned due to the difference in thermal expansion between the metal that is the conductive material and the ceramic.
- Patent Document 3 discloses a method in which an active metal layer is formed between a ceramic substrate and a through electrode by filling the through hole of the ceramic substrate with a metal containing an active metal, thereby densifying the ceramic substrate.
- a metal containing an active metal since the metal brazing containing the active metal has a very high viscosity, it cannot be filled well if the through electrode diameter is small.
- Patent Document 4 discloses a method of using a conductive paste containing an expansion material when forming a through electrode. However, it is difficult to fill all the cavities with only the expansion material, and the denseness of the through electrode cannot be obtained particularly when the plate is thinned.
- Patent Document 5 discloses a method of filling a glass paste after disposing a granular conductive material in each through hole of a ceramic substrate.
- cracks and warpage due to the difference in thermal expansion between the ceramic and the spherical conductive material are likely to occur.
- the through hole is small, it is difficult to arrange the spherical conductive material.
- An object of the present invention is to provide a microstructure capable of improving the water-tightness of a through hole when manufacturing a connection board including a ceramic substrate and a through conductor provided in the through hole.
- connection substrate includes a ceramic substrate provided with a through hole, and a through conductor provided in the through hole, the through conductor having a first main surface and a second main surface.
- the through conductor has a porous metal body, a glass phase formed in pores of the porous metal body, and voids in the pores, and the area ratio of the pores in the cross section of the through conductor is 5 to 50%.
- the area ratio of the glass phase occupying the pores is larger than the area ratio of the glass phase occupying the pores in the second portion, and the area ratio of the voids occupying the pores in the first portion occupies the pores in the second portion. It is characterized by being smaller than the area ratio of the voids.
- a through conductor is obtained by supplying a metal paste to a through hole of a ceramic substrate and baking it.
- the microstructure of such through conductors is uniform throughout.
- the thickness of the ceramic substrate became extremely small, it was considered that a part of the open pores communicated between both main surfaces of the penetrating conductor and a small amount of liquid leakage occurred.
- the present inventor also studied to reduce the pores of the metal porous body constituting the through conductor.
- the thermal expansion difference between the through conductor and the ceramic is large, so that peeling at the interface is likely to occur, and water tightness is impaired through this peeling portion.
- the present inventor has conceived that the ratio of the glass phase is relatively high on the first main surface side of the through conductor, and that the water tightness function is mainly supported here.
- the ratio of the glass phase is kept low on the second main surface side of the through conductor. If this is the case, peeling between the through conductor and the ceramic is less likely to occur as a whole, and water tightness is maintained.
- FIG. (A) is a top view which shows typically the ceramic base material 1 in which the through-hole 2 was arranged
- (b) is a cross-sectional view of the ceramic base material 1.
- FIG. (A) shows a state in which the metal paste 3 is filled in the through-holes of the ceramic substrate 1
- (b) shows a state in which the metal paste 3 is baked to form the metal porous body 4
- (c) The state which formed the glass layer 9 on the 1st main surface 1a of the ceramic base material 1 is shown
- (d) shows the state which removed the glass layer 9.
- FIG. FIG. 2A is a plan view schematically showing the connection substrate 10 in which the through conductor 11 is formed in the through hole 2 ⁇ / b> A
- 2B is a cross-sectional view of the connection substrate 10. It is a schematic diagram which shows the structure of the metal porous body 4 produced
- the ceramic substrate 1 is provided with one main surface 1a and the other main surface 1b, and a large number of through holes 2 penetrating between the main surfaces 1a and 1b are formed. Yes.
- the through hole 2 has an opening 2a on the first main surface 1a side and an opening 2b on the second main surface 1b side.
- a metal paste 3 is filled in the opening 2 of the ceramic substrate 1. Then, by heating the metal paste 3, the metal paste is baked to form a porous metal body 4 in the through hole 2 as shown in FIG.
- the metal porous body 4 extends from the first main surface 1a of the ceramic substrate 1 to the second main surface 1b.
- 5 is a first main surface of the metal porous body
- 6 is a second main surface of the metal porous body.
- a glass paste is applied on the first main surface 1a of the ceramic substrate 1 to form a glass paste layer.
- the glass paste applied on the first main surface 5 of the metal porous body 4 is impregnated into the open pores in the metal porous body 4.
- the glass paste is cured by heating and baking.
- the glass layer 9 is formed on the 1st main surface 1a of the ceramic base material 1.
- the glass paste impregnated in the open pores of the metal porous body is cured to generate a glass phase, thereby generating the through conductor 7 in the through hole.
- Reference numeral 8 denotes a first main surface of the through conductor 8.
- the through conductor is exposed on the first main surface side of the ceramic base material to obtain a connection substrate.
- the first main surface 1a of the ceramic base material 1 is further polished to form a polished surface 1c as shown in FIG.
- the through conductors 11 are filled in the through holes 2A.
- 11 a is a first main surface of the through conductor 11
- 11 b is a second main surface of the through conductor 11.
- the metal porous body 4 includes a metal matrix (base material) 20 and pores 16A, 16B, 16C, and 16D.
- the pores generated in the matrix include open pores 16A and 16D that open to the first main surface 5, open pores 16B that open to the second main surface 6, and closed that are not open to the main surfaces 5 and 6.
- the open pores 16A are open to the first main surface 5 in the cross section of FIG.
- the open pores 16D are not opened in the first main surface 5 in the cross section of FIG. 4, but are opened in the first main surface 5 along a route that does not appear in the cross section.
- the open pores 16A and 16D are distinguished.
- the glass paste is impregnated from the first main surface side into the open pores 16 ⁇ / b> A and 16 ⁇ / b> D opened in the first main surface 5.
- the glass layer 18 is formed on the first main surface 1a, and at the same time, the glass phase 19 is formed in the open pores 16A and 16D.
- the glass phase 17 originally present in the porous metal body may be mixed with the glass phase 19 generated by impregnation and baking of the glass paste.
- the polishing surface 1c is formed on the ceramic substrate 1A, and the thickness of the ceramic substrate 1A is smaller than that before polishing.
- a through conductor 11 is formed in the through hole 2A.
- the open pores 16A and 16D opened in the first main surface 11a include a glass phase 17 derived from a metal paste, a glass phase 19 derived from a glass paste impregnated later, and a main surface 11a. There remains a gap 30 that does not open. Further, in the closed pores 16C, the glass phase 17 derived from the metal paste and the voids 30 that do not open on the main surface remain. Furthermore, in the open pores 16B that open to the second main surface 11b, the glass phase 17 derived from the metal paste, the void 31 that opens to the main surface 11b, and the void 30 that does not open to the main surfaces 11a and 11b remain. is doing.
- the through conductor 11 is divided into a first portion 11A and a second portion 11B on the first main surface 11a side.
- the first part and the second part are divided by a center line L in the thickness direction of the ceramic substrate.
- the area ratio of the glass phases 17 and 19 in the first portion 11A is larger than the area ratio of the glass phases 17 and 19 in the second portion 11B, and the area ratio of the voids 30 and 31 in the first portion 11A. Is smaller than the area ratio of the gaps 30 and 31 in the second portion.
- water tightness can be supported mainly in the first portion 11A, and the second portion. Can alleviate the difference in thermal expansion between the ceramic and the metal and suppress the peeling of the through conductor.
- the glass phase ratio in the first portion was relatively increased by impregnating the glass paste from the first main surface side of the through conductor.
- the present invention is not limited to this manufacturing method.
- the through-conductor having a microstructure as in the present invention can be manufactured by changing the paste composition between the upper half and the lower half of the through-hole.
- the area ratio of the pores in the cross section of the through conductor is 5 to 50%.
- the area ratio of the pores in the cross section of the through conductor is set to 50% or less, and more preferably 40% or less.
- the area ratio of the pores is set to 5% or more, more preferably 15% or more.
- the area ratio of the glass phase occupying the pores in the first portion is larger than the area ratio of the glass phase occupying the pores in the second portion.
- the difference in area ratio is preferably 10% or more, and more preferably 15% or more.
- the area ratio of the voids occupied in the pores in the first part is smaller than the area ratio of the voids occupied in the pores in the second part.
- the difference in area ratio is preferably 10% or more, and more preferably 15% or more.
- the glass phase and void ratio are 60 to 90% and 10 to 40%, respectively, when the pore area in the first portion is 100%. 70 to 90% and 10 to 30% are more preferable. From the same viewpoint, the ratio of the glass phase and the voids is preferably 50 to 80% and 20 to 50%, respectively, when the pore area is 100% in the second portion, and 60 to 80%. And more preferably 20 to 40%.
- the area ratio of metal, glass and voids in the through conductor portion was observed by SEM (1000 times). Since the secondary electron images in the SEM are different for the metal phase, the glass phase, and the voids, each can be easily distinguished.
- the thickness of the ceramic substrate is 25 to 150 ⁇ m, and the diameter W of the through hole (see FIGS. 3A and 3B) is 20 ⁇ m to 60 ⁇ m.
- the present invention is particularly useful for such a small and thin connection substrate.
- the diameter W of the through hole formed in the ceramic substrate is more preferably 25 ⁇ m or more from the viewpoint of ease of forming.
- the distance D (distance between the nearest through holes) between adjacent through holes 2 is preferably 50 ⁇ m or more, and more preferably 100 ⁇ m or more, from the viewpoint of suppressing breakage and cracks.
- the distance D between the adjacent through holes 2 is preferably 1000 ⁇ m or less, and more preferably 500 ⁇ m or less, from the viewpoint of improving the density of the through holes.
- the method for forming the through hole in the ceramic substrate is not particularly limited.
- a through hole can be formed in a green sheet of a ceramic substrate by pins or laser processing.
- a through-hole can also be formed in a blank substrate by laser processing.
- Ceramics constituting the ceramic substrate include alumina, aluminum nitride, silicon nitride, and zirconia.
- a metal paste is supplied to the through holes, and a metal porous body is generated by heating.
- the metal that is the main component constituting such a metal paste include Ag, Au, Cu, Pd, or a mixture thereof.
- glass components include various lead-based and vanadium-based low-melting glasses, borosilicate-based, low-melting alkali-based, and phosphoric acid-based glasses.
- the baking temperature of the metal paste is appropriately selected depending on the type of paste, and can be set to 500 to 900 ° C., for example.
- a glass paste is applied to the first main surface of the metal porous body, and the open pores of the metal porous body are impregnated with the glass paste.
- the glass paste can be applied over the entire first main surface of the ceramic substrate.
- the glass paste may be applied only on the first main surface of the porous metal body by screen printing or the like, and the glass paste may not be applied on the other ceramic surfaces.
- the glass paste is cured by heating to form a glass layer on the main surface of the porous metal body, and the glass paste impregnated in the open pores is used as the glass phase.
- the baking temperature of the glass paste is appropriately selected depending on the type of paste, and can be set to 500 to 900 ° C., for example.
- connection substrate having a ceramic substrate and a through conductor provided in the through hole is obtained.
- the first main surface of the ceramic substrate is preferably polished.
- predetermined wiring, a pad, etc. are formed in each main surface 11a, 11b of a ceramic substrate.
- the ceramic substrate is an integral relay substrate.
- the ceramic substrate is preferably precision polished.
- CMP Chemical Mechanical Polishing
- polishing slurry a slurry in which abrasive grains having a particle size of 30 nm to 200 nm are dispersed in an alkali or neutral solution is used.
- the abrasive material include silica, alumina, diamond, zirconia, and ceria, which are used alone or in combination.
- a hard urethane pad, a nonwoven fabric pad, and a suede pad can be illustrated as a polishing pad.
- Example 1 A connection substrate was fabricated as described with reference to FIGS. Specifically, first, a slurry in which the following components were mixed was prepared.
- This slurry was formed into a tape shape using a doctor blade method so as to have a thickness of 300 ⁇ m in terms of the thickness after firing, and was cut to have a diameter of 100 mm in terms of the size after firing.
- the obtained powder compact is calcined at 1240 ° C. in the atmosphere (preliminary firing), and then the substrate is placed on a molybdenum plate and heated at a rate of 1300 ° C. to 1550 ° C. in an atmosphere of hydrogen 3: nitrogen 1. Was kept at 1550 ° C. for 2.5 hours and baked to obtain a blank substrate.
- the blank substrate was laser processed under the following conditions to form through holes having the following dimensions.
- CO2 laser wavelength 10.6 ⁇ m Pulse: 1000Hz- On time 5 ⁇ s
- Laser mask diameter 0.9 mm Number of shots: 40 times Through-hole diameter W: 0.08 mm Through hole spacing D: 0.12 mm Number of through-holes: 10,000 pieces / piece
- the melt (dross) adhering to the substrate surface was removed by grinding with a grinder, and then annealed at 1300 ° C. in the atmosphere for 5 hours to obtain a ceramic substrate having a thickness of 200 ⁇ m.
- the Ag paste was embedded in the through hole by printing.
- the Ag paste contains 10% or less glass component.
- it baked at 700 degreeC and formed the metal porous body in the through-hole.
- a low melting point borosilicate glass paste was printed on the first main surface of the ceramic substrate, and the glass paste was melted at 700 ° C.
- connection substrate the glass layer remaining on the surface was removed by polishing to obtain a connection substrate. Specifically, after grinding with a grinder with the substrate attached to an alumina plate, lapping with diamond slurry was performed on both sides. The particle size of diamond was 3 ⁇ m. Finally, CMP processing using SiO 2 abrasive grains and diamond abrasive grains was performed. Thereafter, the substrate was peeled off from the alumina plate, the same processing was performed on the main surface on the opposite side, and washing was performed to obtain a connection substrate.
- Pore area ratio in the cross section of the through conductor 40% Area ratio of glass phase to pores in the first part: 90% Area ratio of voids in pores in the first part: 10% Area ratio of glass phase in pores in second part: 75% Area ratio of voids in the second part: 25%
- the water tightness of the through conductor of the obtained connection board was confirmed by a method described with reference to FIG. That is, the porous plate 21 was fixed to the pedestal 22, the dust-free paper 23 was placed on the pedestal 22, and the ceramic substrate sample 24 was placed thereon. Water 26 was dropped onto the through hole of the ceramic substrate 24 and sucked as indicated by an arrow A. Then, it was confirmed whether or not moisture was observed on the dust-free paper.
- the number of through conductors in which liquid leakage was observed was one for 10,000 through conductors provided on one ceramic substrate.
- Example 2 A connection board was produced in the same manner as in Example 1. However, the area ratio of the pores in the cross section of the through conductor, the area ratio of the glass phase in the first part, the area ratio of the void in the first part, the area ratio of the glass phase in the second part, and the second part The area ratio of the voids was changed as shown in Table 1. In order to change these parameters, it was decided to adjust the melting temperature of the glass layer from 700 ° C. to 750 ° C. and 800 ° C. by reducing the viscosity of the glass.
- Example 1 An Ag paste was embedded in each through-hole of the same ceramic substrate as in Example 1.
- the Ag paste used is the same as in Example 1. Then, it baked at 700 degreeC and formed the metal porous body in the through-hole.
- both main surfaces of the ceramic base material were precision-polished without carrying out a step of printing the glass paste on the first main surface of the ceramic base material to obtain a connection substrate.
- each parameter indicating the microstructure is as follows. Pore area ratio in the cross section of the through conductor: 40% Area ratio of glass phase in pores in cross section of through conductor: 20% Area ratio of voids to pores in the cross section of the through conductor: 80%
- Example 2 a water tightness test was conducted in the same manner as in Example 1. As a result, liquid leakage was observed in almost all 10000 through conductors provided on one ceramic substrate.
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Abstract
Description
本発明では、貫通導体の横断面において気孔の面積比率が5~50%である。気孔の面積比率が高すぎると、貫通導体の水密性が低下する。こうした観点から、貫通導体の横断面において気孔の面積比率を50%以下とするが、40%以下とすることが更に好ましい。また、気孔の面積比率が低すぎると、貫通導体とセラミックスとの熱膨張差に起因する剥離によって水密性が低下する。こうした観点からは、気孔の面積比率を5%以上とするが、15%以上とすることが更に好ましい。
図1~図6を参照しつつ説明したようにして接続基板を作製した。
具体的には、まず以下の成分を混合したスラリーを調製した。
・比表面積3.5~4.5m2/g、
平均一次粒子径0.35~0.45μmのα-アルミナ粉末
(アルミナ純度99.99%) 100質量部
・MgO(マグネシア) 250pppm
・ZrO2(ジルコニア) 400ppm
・Y2O3(イットリア) 15ppm
(分散媒)
・2-エチルヘキサノール 45重量部
(結合剤)
・PVB(ポリビニルブチラール)樹脂 4重量部
(分散剤)
・高分子界面活性剤 3重量部
(可塑剤)
・DOP 0.1重量部
CO2レーザー:波長 10.6μm
パルス:1000Hz- On time 5μs
レーザーマスク径: 0.9 mm
ショット回数: 40回
貫通孔径W: 0.08 mm
貫通孔の間隔D: 0.12 mm
貫通孔の数 : 10,000個/枚
貫通導体の横断面における気孔の面積比率: 40%
第一の部分において気孔に占めるガラス相の面積比率: 90%
第一の部分において気孔に占める空隙の面積比率: 10%
第二の部分において気孔に占めるガラス相の面積比率: 75%
第二の部分において気孔に占める空隙の面積比率: 25%
すなわち、台座22に多孔体板21を固定し、台座22上に無塵紙23を載置し、その上にセラミック基板のサンプル24を設置した。セラミック基板24の貫通孔上に水26を滴下し、矢印Aのように吸引した。そして、無塵紙に水分の付着が見られるかどうかを確認した。
実施例1と同様にして接続基板を作製した。
ただし、貫通導体の横断面における気孔の面積比率、第一の部分におけるガラス相の面積比率、第一の部分における空隙の面積比率、第二の部分におけるガラス相の面積比率および第二の部分における空隙の面積比率を、表1に示すように変更した。これらのパラメーターを変更するには、ガラス層の溶融温度を700℃から750℃、800℃とすることでガラスの粘性を低下させて調整することとした。
実施例1と同じセラミック基材の各貫通孔にAgペースト埋め込みを行った。使用したAgペーストは実施例1と同じである。その後、700℃にて焼成を行い、貫通孔中に金属多孔体を形成した。
貫通導体の横断面における気孔の面積比率: 40%
貫通導体の横断面において気孔に占めるガラス相の面積比率: 20%
貫通導体の横断面において気孔に占める空隙の面積比率: 80%
Claims (3)
- 貫通孔が設けられているセラミック基板、および
前記貫通孔中に設けられた貫通導体であって、第一の主面と第二の主面とを有する貫通導体を備える接続基板であって、
前記貫通導体が、金属多孔体、この金属多孔体の気孔に形成されているガラス相、および前記気孔内の空隙を有しており、
前記貫通導体の横断面において前記気孔の面積比率が5~50%であり、
前記貫通導体を前記セラミック基板の厚さ方向に見て前記第一の主面側の第一の部分と前記第二の主面側の第二の部分とに分けたとき、前記第一の部分において前記気孔に占める前記ガラス相の面積比率が前記第二の部分において前記気孔に占める前記ガラス相の面積比率よりも大きく、前記第一の部分において前記気孔に占める前記空隙の面積比率が前記第二の部分において前記気孔に占める前記空隙の面積比率よりも小さいことを特徴とする、接続基板。 - 前記第一の部分において前記気孔の面積を100%としたときの前記ガラス相および前記空隙の面積比率がそれぞれ60~90%および10~40%であり、前記第二の部分において前記気孔の面積を100%としたときの前記ガラス相および前記空隙の面積比率がそれぞれ50~80%および20~50%であることを特徴とする、請求項1記載の接続基板。
- 前記セラミック基板の厚さが25~150μmであり、前記貫通孔の径が20μm~60μmであることを特徴とする、請求項1または2記載の接続基板。
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KR1020187024082A KR20180121509A (ko) | 2016-03-11 | 2017-02-23 | 접속 기판 |
DE112017001260.0T DE112017001260T5 (de) | 2016-03-11 | 2017-02-23 | Verbindungssubstrat |
JP2018504357A JP6831832B2 (ja) | 2016-03-11 | 2017-02-23 | 接続基板 |
CN201780006847.2A CN108886870B (zh) | 2016-03-11 | 2017-02-23 | 连接基板 |
US16/108,317 US10278286B2 (en) | 2016-03-11 | 2018-08-22 | Connection substrate |
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JP (1) | JP6831832B2 (ja) |
KR (1) | KR20180121509A (ja) |
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KR20180121509A (ko) | 2018-11-07 |
JP6831832B2 (ja) | 2021-02-17 |
JPWO2017154593A1 (ja) | 2019-01-17 |
CN108886870A (zh) | 2018-11-23 |
TWI722129B (zh) | 2021-03-21 |
DE112017001260T5 (de) | 2018-11-29 |
TW201802945A (zh) | 2018-01-16 |
US10278286B2 (en) | 2019-04-30 |
US20190014663A1 (en) | 2019-01-10 |
CN108886870B (zh) | 2021-03-09 |
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