WO2014061765A1 - 導電性ペースト - Google Patents
導電性ペースト Download PDFInfo
- Publication number
- WO2014061765A1 WO2014061765A1 PCT/JP2013/078260 JP2013078260W WO2014061765A1 WO 2014061765 A1 WO2014061765 A1 WO 2014061765A1 JP 2013078260 W JP2013078260 W JP 2013078260W WO 2014061765 A1 WO2014061765 A1 WO 2014061765A1
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- WO
- WIPO (PCT)
- Prior art keywords
- conductive paste
- powder
- manganese
- tin
- copper
- 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.)
- Ceased
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D201/00—Coating compositions based on unspecified macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/16—Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
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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
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
- H05K1/092—Dispersed materials, e.g. conductive pastes or inks
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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
- H05K1/18—Printed circuits structurally associated with non-printed electric components
-
- 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
- H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
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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
- H05K2201/03—Conductive materials
- H05K2201/032—Materials
-
- 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
- H05K2203/1126—Firing, i.e. heating a powder or paste above the melting temperature of at least one of its constituents
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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
- H05K2203/12—Using specific substances
Definitions
- the present invention relates to a sintered conductive paste that can be used, for example, for forming a conductor pattern of a printed wiring board.
- An electrically conductive paste in which metal particles are dispersed in a vehicle composed of an organic binder and a solvent is known.
- the conductive paste is used for forming a conductor pattern of a printed wiring board, forming an electrode of an electronic component, and the like.
- This type of conductive paste can be roughly classified into a resin curing type and a baking type.
- the resin curable conductive paste is a conductive paste in which metal particles are brought into contact with each other by curing of the resin to ensure conductivity.
- Firing type conductive paste is a conductive paste in which metal particles are sintered by firing to ensure conductivity.
- the metal particles contained in the conductive paste for example, copper powder or silver powder is used.
- Copper powder has the advantage of being excellent in conductivity and being cheaper than silver powder.
- copper powder is easily oxidized in the air atmosphere, for example, after forming a conductor pattern on a substrate, there is a drawback that the surface of the conductor pattern must be covered with a protective material.
- silver powder is stable in the air and has an advantage that a conductor pattern can be formed by firing in an air atmosphere, but has a disadvantage that electromigration is likely to occur.
- Patent Document 1 discloses a conductive material having silver powder as a main conductive material, characterized by containing 1 to 100 parts by mass of manganese and / or manganese alloy powder with respect to 100 parts by mass of silver powder.
- a paint is disclosed.
- Patent Document 2 discloses a conductive paste containing a binder resin, Ag powder, and at least one metal or metal compound selected from the group consisting of Ti, Ni, In, Sn, and Sb. Yes.
- the conductive paste disclosed in Patent Documents 1 and 2 has insufficient adhesion to the substrate and solder heat resistance, and has a problem in practicality when used for forming a conductor pattern on the substrate. .
- Patent Document 3 includes a first metal component that suppresses silver sintering and a second metal component that promotes silver sintering.
- a conductive paste characterized in that silver powder is coated with a material is disclosed.
- Patent Document 3 improves the solder heat resistance to some extent, since the sinterability of silver is suppressed, the conductivity of the conductive pattern obtained by firing the conductive paste is low. There was a problem of lowering. Moreover, since the process of coat
- An object of the present invention is to provide a sintered conductive paste excellent in electromigration resistance, solder heat resistance, and adhesion to a substrate.
- the present inventors have conducted intensive research on a sintered conductive paste that can sufficiently satisfy electromigration resistance, solder heat resistance, and adhesion to a substrate. As a result, it was discovered that it is effective to add powder containing copper, tin, and manganese in addition to silver powder, glass frit, and organic binder, and the present invention was completed.
- a conductive paste comprising the following components (A) to (D): (A) Silver powder (B) Glass frit (C) Organic binder (D) Powder containing copper, tin, and manganese
- a printed wiring board obtained by applying the conductive paste according to any one of (1) to (12) above onto a substrate and then firing the substrate at 500 to 900 ° C.
- a sintered conductive paste excellent in electromigration resistance, solder heat resistance, and adhesion to a substrate can be provided.
- the conductive paste according to the embodiment of the present invention is (A) silver powder, (B) a glass frit; (C) an organic binder; (D) It contains the powder containing copper, tin, and manganese, It is characterized by the above-mentioned.
- the conductive paste of the present invention contains (A) silver powder as conductive particles.
- the powder which consists of silver or an alloy containing silver can be used.
- the shape of the silver powder particles is not particularly limited, and for example, spherical, granular, flaky or scaly silver powder particles can be used.
- the average particle size of the silver powder used in the present invention is preferably 0.1 ⁇ m to 100 ⁇ m, more preferably 0.1 ⁇ m to 20 ⁇ m, and most preferably 0.1 ⁇ m to 10 ⁇ m.
- the average particle diameter here means a volume-based median diameter (d50) obtained by a laser diffraction / scattering particle size distribution measurement method.
- the average particle diameter of the silver powder used in the present invention is preferably in the above range.
- the method for producing silver powder is not particularly limited, and for example, it can be produced by a reduction method, a pulverization method, an electrolysis method, an atomization method, a heat treatment method, or a combination thereof.
- the flaky silver powder can be produced, for example, by crushing spherical or granular silver particles with a ball mill or the like.
- the electrically conductive paste of this invention contains (B) glass frit.
- the conductive paste contains glass frit, the adhesion of the conductive pattern obtained by firing the conductive paste to the substrate is improved.
- the glass frit used in the present invention is not particularly limited, and a glass frit having a softening point of 300 ° C. or more, more preferably a softening point of 400 to 1000 ° C., still more preferably a softening point of 400 to 700 ° C. can be used.
- the softening point of the glass frit can be measured using a thermogravimetry apparatus (for example, TG-DTA2000SA manufactured by BRUKER AXS).
- glass frit examples include bismuth borosilicate, alkali metal borosilicate, alkaline earth metal borosilicate, zinc borosilicate, lead borosilicate, lead borosilicate, lead silicate, Examples thereof include bismuth borate and zinc borate glass frit.
- the glass frit is preferably lead-free in consideration of the environment, and examples thereof include bismuth borosilicate and alkali metal borosilicate glass frit.
- the average particle size of the glass frit is preferably 0.1 to 20 ⁇ m, more preferably 0.2 to 10 ⁇ m, and most preferably 0.5 to 5 ⁇ m.
- the average particle diameter here means a volume-based median diameter (d50) obtained by a laser diffraction / scattering particle size distribution measurement method.
- the content of (B) glass frit is preferably 0.01 to 20 parts by mass, more preferably 0.1 to 10 parts by mass with respect to 100 parts by mass of (A) silver powder. It is.
- the glass frit content is less than this range, the adhesion of the conductive pattern obtained by firing the conductive paste to the substrate is lowered.
- the content of the glass frit is larger than this range, the conductivity of the conductor pattern obtained by firing the conductive paste is lowered.
- the conductive paste of the present invention contains (C) an organic binder.
- the organic binder in the present invention joins silver powders in a conductive paste, and burns out when the conductive paste is fired.
- an organic binder for example, a thermosetting resin or a thermoplastic resin can be used.
- thermosetting resin for example, epoxy resin, urethane resin, vinyl ester resin, silicone resin, phenol resin, urea resin, melamine resin, unsaturated polyester resin, diallyl phthalate resin, polyimide resin and the like
- thermoplastic resin examples include cellulose resins such as ethyl cellulose and nitrocellulose, acrylic resins, alkyd resins, saturated polyester resins, butyral resins, polyvinyl alcohol, and hydroxypropyl cellulose. These resins may be used alone or in combination of two or more.
- the content of (C) the organic binder is preferably 0.5 to 30 parts by mass, more preferably 1.0 to 10 parts by mass with respect to 100 parts by mass of (A) silver powder. Part.
- the content of the organic binder (C) in the conductive paste is within the above range, the coating property of the conductive paste on the substrate is improved, and a fine pattern can be formed with high accuracy.
- the content of the organic binder (C) exceeds the above range, the amount of the organic binder contained in the conductive paste is too large, and the denseness of the conductor pattern obtained after firing may be reduced.
- the conductive paste of the present invention contains (D) a powder containing copper, tin, and manganese.
- This (D) powder may be a mixed powder of metals containing copper, tin, and manganese, may be an alloy powder containing copper, tin, and manganese, or may contain copper, tin, and manganese.
- the compound powder may be included.
- the mixed powder of metal containing copper, tin, and manganese is a mixed powder of copper or copper alloy, tin or tin alloy, and manganese or manganese alloy.
- the alloy powder containing copper, tin, and manganese is an alloy powder containing copper, tin, and manganese.
- the compound powder containing copper, tin, and manganese is a powder containing a copper compound, a tin compound, and a manganese compound.
- Each of copper, tin, and manganese contained in the powder may be a single metal or an oxide.
- copper may be a single metal (Cu) or an oxide (for example, CuO).
- Tin may be a single metal (Sn) or an oxide (for example, SnO).
- Manganese may be a single metal (Mn) or an oxide (for example, MnO).
- the compound (for example, hydroxide) which changes into an oxide at the time of baking of an electrically conductive paste may be sufficient as copper, tin, and manganese contained in (D) powder.
- the copper may be Cu (OH) 2 .
- Tin may be Sn (OH) 2 .
- Manganese may be Mn (OH) 2 .
- manganese simple metal is very hard, and it is difficult to obtain metal powder with uniform particle size. Accordingly, manganese is preferably in the form of an oxide (eg, MnO) or an alloy.
- manganese and tin are effective even with an extremely small addition amount. For this reason, in order to disperse
- the conductive paste contains (D) a powder containing copper, tin, and manganese, all of the electromigration resistance, solder heat resistance, and adhesion to the substrate of the conductive paste are improved.
- D a powder containing copper, tin, and manganese
- the content of the powder containing (D) copper, tin, and manganese is preferably 0.1 to 5.0 parts by mass with respect to 100 parts by mass of (A) silver powder.
- the amount is preferably 0.2 to 3.0 parts by mass, and more preferably 0.3 to 1.0 parts by mass.
- the element equivalent content of copper (Cu) is preferably 0.005 to 2.85 parts by mass, more preferably 0.015 to 2 parts by mass with respect to 100 parts by mass of (A) silver powder. Part.
- the elemental content of tin (Sn) is preferably 0.0025 to 2.85 parts by mass, more preferably 0.015 to 1 part by mass with respect to 100 parts by mass of (A) silver powder. Part, more preferably 0.02 to 0.075 part by mass.
- the elemental content of manganese (Mn) is preferably 0.0001 to 0.9 parts by mass, more preferably 0.0003 to 0.000 parts per 100 parts by mass of (A) silver powder. 7 parts by mass.
- the content in terms of elemental tin is preferably 0.01 to 0.3 in terms of mass ratio.
- the elemental content of manganese when the copper content is 1 is preferably 0.01 to 2.5 in terms of mass ratio.
- the electromigration resistance, solder heat resistance, and adhesion to the substrate of the conductive paste are further improved.
- the solder wettability of a conductive paste improves rather than the case where only two components are contained among these.
- the conductive paste of the present invention may contain a solvent for viscosity adjustment and the like.
- the solvent include alcohols such as methanol, ethanol and isopropyl alcohol (IPA), organic acids such as ethylene acetate, aromatic hydrocarbons such as toluene and xylene, N-methyl-2-pyrrolidone (NMP) and the like.
- the content of the solvent is not particularly limited, but is preferably 1 to 100 parts by mass, more preferably 5 to 60 parts by mass with respect to 100 parts by mass of (A) silver powder.
- the viscosity of the conductive paste of the present invention is preferably 50 to 700 Pa ⁇ s, more preferably 100 to 300 Pa ⁇ s. By adjusting the viscosity of the conductive paste within this range, the coating property and handling property of the conductive paste to the substrate are improved, and the conductive paste can be applied to the substrate with a uniform thickness.
- the conductive paste of the present invention may contain other additives such as a dispersant, a rheology modifier, and a pigment.
- the conductive paste of the present invention further comprises an inorganic filler (for example, fumed silica, calcium carbonate, talc, etc.), a coupling agent (for example, a silane coupling agent such as ⁇ -glycidoxypropyltrimethoxysilane, tetra Titanate coupling agents such as octyl bis (ditridecyl phosphite) titanate), silane monomers (eg, tris (3- (trimethoxysilyl) propyl) isocyanurate), plasticizers (eg, carboxyl-terminated polybutadiene-acrylonitrile, etc.) Copolymer resin, silicone rubber, silicone rubber powder, silicone resin powder, acrylic resin powder, etc.), flame retardant, antioxidant, antifoaming agent and the like.
- a coupling agent for example, a silane coupling agent such as ⁇ -glycidoxypropyltrimethoxysilane, tetra Titanate coupling agents such
- the conductive paste of the present invention may contain a metal oxide.
- the metal oxide include copper oxide, bismuth oxide, manganese oxide, cobalt oxide, magnesium oxide, tantalum oxide, niobium oxide, and tungsten oxide.
- cobalt oxide improves solder heat resistance.
- Bismuth oxide promotes sintering of silver powder and improves solder wettability.
- the conductive paste of the present invention can be produced by mixing the above-described components using, for example, a lykai machine, a pot mill, a three-roll mill, a rotary mixer, a twin screw mixer or the like.
- the conductive paste of the present invention is applied on a substrate.
- the coating method is arbitrary, and for example, the coating can be performed using a known method such as dispensing, jet dispensing, stencil printing, screen printing, pin transfer, stamping and the like.
- the substrate After applying the conductive paste on the substrate, the substrate is put into an electric furnace or the like. Then, the conductive paste applied on the substrate is baked at 500 to 1000 ° C., more preferably 600 to 1000 ° C., and still more preferably 700 to 900 ° C. Thereby, while silver powder contained in a conductive paste sinters, components, such as an organic binder contained in a conductive paste, burn out.
- the conductor pattern obtained in this way has very high conductivity. Moreover, the electromigration resistance, the solder heat resistance, and the adhesion to the substrate are excellent.
- the conductive paste of the present invention can be used for forming a circuit of an electronic component, forming an electrode, or bonding an electronic component to a substrate.
- it can be used for forming a conductor circuit of a printed wiring board, forming an external electrode of a multilayer ceramic capacitor, or the like.
- the conductive paste of the present invention can be used for forming a conductor pattern (circuit pattern) on an alumina substrate for an LED reflector.
- components, lead wires, and the like are soldered to a conductor pattern formed using a conductive paste, it is possible to take advantage of the good solder heat resistance of the conductive paste of the present invention. . Therefore, by using the conductive paste of the present invention, it is possible to produce a printed wiring board and an electronic product that are excellent in electrical characteristics.
- (C) Organic Binder An organic binder obtained by dissolving an ethyl cellulose resin in butyl carbitol was used. The mixing ratio of the ethyl cellulose resin and butyl carbitol is 30:70 (mass ratio).
- (D-3) Mixed powder containing copper, tin, and manganese oxides Powder obtained by mixing copper (II) oxide, tin (IV) oxide, and manganese (IV) oxide.
- the electromigration resistance of the conductor patterns produced using the conductive pastes of Examples 1 to 12 and Comparative Examples 1 to 7 was measured by the following procedure. First, as shown in FIG.1 (c), the ultrapure water was dripped so that the front-end
- solder heat resistance of the conductor patterns produced using the conductive pastes of Examples 1 to 12 and Comparative Examples 1 to 7 was determined in accordance with JIS C 0054 “Solderability of surface mount components (SMD) and resistance to solder erosion of electrodes”. And the solder heat resistance test method ". Specifically, the substrate on which the conductor pattern was formed was immersed in a 260 ° C. solder bath, the substrate was pulled up from the solder bath, and then the conductor pattern remaining on the substrate was visually observed. And the immersion time until 5% of the area of a conductor pattern was lost was measured. When the immersion time was 20 seconds or more, it was evaluated that the solder heat resistance of the conductor pattern was excellent.
- the adhesion of the conductor patterns produced using the conductive pastes of Examples 1 to 12 and Comparative Examples 1 to 7 to the substrate was measured by the following procedure. First, the conductive paste was applied on an alumina substrate with a size of 2 mm ⁇ using a stencil printing method. A test piece of 32 mm ⁇ 16 mm was placed on the conductive paste applied on the substrate, and then the substrate was put into an electric furnace and heated at 850 ° C. for 60 minutes. The shear strength (N / mm 2 ) of the test piece with respect to the substrate was measured using a tabletop universal testing machine (1605HTP manufactured by Aiko Engineering Co., Ltd.). When the measured shear strength was 70 N / mm 2 or more, it was evaluated that the adhesion of the conductor pattern to the substrate was excellent.
- the conductive patterns obtained by firing the conductive pastes of Examples 1 to 12 are excellent in electromigration resistance, solder heat resistance, and adhesion to the substrate. It was.
- the conductive patterns obtained by firing the conductive pastes of Comparative Examples 1 to 7 have electromigration resistance, solder heat resistance, and adhesion to the substrate. It was inferior.
- the conductive paste containing cobalt oxide and bismuth oxide is more resistant to migration and solder than the conductive paste containing no cobalt oxide and bismuth oxide. was excellent.
- (D) the powder containing copper, tin, and manganese is contained in an amount of 0.1 to 3.0 parts by mass with respect to 100 parts by mass of (A) silver powder.
- the conductive paste was excellent in electromigration resistance, solder heat resistance, and adhesion to the substrate.
- the conductive paste containing 0.0905 to 2.715 parts by mass of copper (Cu) with respect to 100 parts by mass of silver powder (A) is electromigration resistant. , Solder heat resistance, and adhesion to the substrate were excellent.
- the conductive paste containing 0.0025 to 0.075 parts by mass of tin (Sn) with respect to 100 parts by mass of the silver powder (A) is resistant to electromigration. , Solder heat resistance, and adhesion to the substrate were excellent.
- the conductive paste containing 0.0033 to 0.21 parts by mass of manganese (Mn) with respect to 100 parts by mass of the silver powder (A) is resistant to electromigration. , Solder heat resistance, and adhesion to the substrate were excellent.
- the conductive paste containing no copper, tin, or manganese resulted in poor electromigration resistance, solder heat resistance, and adhesion to the substrate.
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Abstract
Description
(1)以下の(A)~(D)成分を含有することを特徴とする導電性ペースト。
(A)銀粉
(B)ガラスフリット
(C)有機バインダ
(D)銅、錫、及びマンガンを含む粉末
本発明の実施形態に係る導電性ペーストは、
(A)銀粉と、
(B)ガラスフリットと、
(C)有機バインダと、
(D)銅、錫、及びマンガンを含む粉末と、を含有することを特徴とする。
本発明の導電性ペーストは、導電性粒子として(A)銀粉を含む。本発明における銀粉としては、銀または銀を含む合金からなる粉末を用いることができる。銀粉粒子の形状は、特に限定されず、例えば、球状、粒状、フレーク状、あるいは鱗片状の銀粉粒子を用いることが可能である。
本発明の導電性ペーストは、(B)ガラスフリットを含有する。導電性ペーストがガラスフリットを含有することによって、導電性ペーストを焼成して得られる導体パターンの基板への密着性が向上する。本発明に用いるガラスフリットは、特に限定されず、好ましくは軟化点300℃以上、より好ましくは軟化点400~1000℃、さらに好ましくは軟化点400~700℃のガラスフリットを用いることができる。ガラスフリットの軟化点は、熱重量測定装置(例えば、BRUKER AXS社製、TG-DTA2000SA)を用いて測定することができる。
本発明の導電性ペーストは、(C)有機バインダを含有する。本発明における有機バインダは、導電性ペースト中において銀粉同士をつなぎあわせるものであり、かつ、導電性ペーストの焼成時に焼失するものである。有機バインダとしては、特に限定するものではないが、例えば、熱硬化性樹脂あるいは熱可塑性樹脂を用いることができる。
熱可塑性樹脂としては、例えば、エチルセルロース、ニトロセルロース等のセルロース系樹脂、アクリル樹脂、アルキド樹脂、飽和ポリエステル樹脂、ブチラール樹脂、ポリビニルアルコール、ヒドロキシプロピルセルロース等を用いることができる。
これらの樹脂は、単独で使用してもよく、2種類以上を混合して使用してもよい。
導電性ペースト中の(C)有機バインダの含有量が上記の範囲内の場合、導電性ペーストの基板への塗布性が向上し、微細なパターンを高精度に形成することができる。一方、(C)有機バインダの含有量が上記の範囲を超えると、導電性ペースト中に含まれる有機バインダの量が多すぎるため、焼成後に得られる導体パターンの緻密性が低下する場合がある。
本発明の導電性ペーストは、(D)銅、錫、及びマンガンを含む粉末を含有する。この(D)粉末は、銅、錫、及びマンガンを含む金属の混合粉であってもよいし、銅、錫、及びマンガンを含む合金粉であってもよいし、銅、錫、及びマンガンを含む化合物粉であってもよい。
銅、錫、及びマンガンを含む合金粉とは、銅、錫、及びマンガンを含む合金の粉末のことである。
銅、錫、及びマンガンを含む化合物粉とは、銅の化合物、錫の化合物、及びマンガンの化合物を含む粉末のことである。
溶媒としては、例えば、メタノール、エタノール、イソプロピルアルコール(IPA)等のアルコール類、酢酸エチレン等の有機酸類、トルエン、キシレン等の芳香族炭化水素類、N-メチル-2-ピロリドン(NMP)等のN-アルキルピロリドン類、N,N-ジメチルホルムアミド(DMF)等のアミド類、メチルエチルケトン(MEK)等のケトン類、テルピネオール(TEL)、ブチルカルビトール(BC)等の環状カーボネート類、及び水等が挙げられる。
溶媒の含有量は、特に限定されないが、(A)銀粉100質量部に対して、好ましくは1~100質量部、より好ましくは5~60質量部である。
まず、本発明の導電性ペーストを基板上に塗布する。塗布方法は任意であり、例えば、ディスペンス、ジェットディスペンス、孔版印刷、スクリーン印刷、ピン転写、スタンピングなどの公知の方法を用いて塗布することができる。
以下の(A)~(F)成分を、表1及び表2に記載した実施例1~12、及び、表3に記載した比較例1~7の割合で混合して導電性ペーストを調製した。なお、表1~3に示す各成分の割合は、全て質量部で示している。
(A)銀粉
平均粒径5μmの球状銀粉。
平均粒径5.2μm、軟化点440℃のBi2O3・B2O3系ガラスフリット。
有機バインダとして、エチルセルロース樹脂をブチルカルビトールに溶解させたものを使用した。エチルセルロース樹脂とブチルカルビトールの混合比は、30:70(質量比)である。
Cu:Mn:Sn = 90.5:7.0:2.5の組成で、ガスアトマイズ法によって製造された平均粒径3μmの球状合金粉。
銅:平均粒径3μmの球状銅粉
錫:平均粒径3μmの球状錫粉
マンガン:平均粒径3μmの球状マンガン粉
酸化銅(II)と、酸化錫(IV)と、酸化マンガン(IV)とを混合した粉末。
平均粒径3μmのCoO(酸化コバルト(II))粉末
平均粒径3μmのBi2O3(酸化ビスマス(III))粉末
実施例1~12及び比較例1~7の導電性ペーストを、孔版印刷法によってアルミナ基板に塗布した。図1(a)は、アルミナ基板に塗布した導電性ペーストの形状(パターン)を示している。
つぎに、図1(b)に示すように、アルミナ基板を電気炉に投入して850℃で60分間焼成した。これにより、アルミナ基板上に、先端部が約1.5mm離れた2つの導体パターンを作製した。
実施例1~12及び比較例1~7の導電性ペーストを用いて作製した導体パターンの耐エレクトロマイグレーション性を、以下の手順で測定した。
まず、図1(c)に示すように、2つの導体パターンの先端部が覆われるようにして超純水を滴下した。
つぎに、図1(d)に示すように、2つの導体パターンの間に電圧(40V、0.1A)を印加した。
そして、2つの導体パターン間に流れる電流値が0からショート(短絡)に達するまでの時間を測定し、このような測定を5回繰り返してその平均値を算出した。
ショートに達するまでの時間が長いほど、導体パターンの耐エレクトロマイグレーション性が優れていることを意味する。ショートに達するまでの時間が30秒以上の場合、耐エレクトロマイグレーション性が優れていると評価した。
実施例1~12及び比較例1~7の導電性ペーストを用いて作製した導体パターンのはんだ耐熱性を、JIS C 0054「表面実装部品(SMD)のはんだ付け性、電極の耐はんだ食われ性及びはんだ耐熱性試験方法」に規定された方法に従って測定した。
具体的には、導体パターンが形成された基板を260℃のはんだ槽に浸漬し、はんだ槽から基板を引き上げた後、基板上に残存する導体パターンを目視で観察した。そして、導体パターンの面積の5%が失われるまでの浸漬時間を測定した。浸漬時間が20秒以上の場合、導体パターンのはんだ耐熱性が優れていると評価した。
実施例1~12及び比較例1~7の導電性ペーストを用いて作製した導体パターンの基板への密着性を、以下の手順で測定した。
まず、導電性ペーストをアルミナ基板上に孔版印刷法を用いて2mmφの大きさで塗布した。
基板上に塗布した導電性ペースト上に、32mm×16mmの試験片を載置した後、この基板を電気炉に投入して850℃で60分間加熱した。
卓上万能試験機(アイコーエンジニアリング(株)社製1605HTP)を用いて基板に対する試験片の剪断強度(N/mm2)を測定した。
測定された剪断強度が70N/mm2以上の場合、導体パターンの基板への密着性が優れていると評価した。
Claims (14)
- 以下の(A)~(D)成分を含有することを特徴とする導電性ペースト。
(A)銀粉
(B)ガラスフリット
(C)有機バインダ
(D)銅、錫、及びマンガンを含む粉末 - 前記(D)粉末は、銅、錫、及びマンガンを含む金属の混合粉である請求項1記載の導電性ペースト。
- 前記(D)粉末は、銅、錫、及びマンガンを含む合金粉である請求項1記載の導電性ペースト。
- 前記(D)粉末は、銅、錫、及びマンガンを含む化合物粉である請求項1記載の導電性ペースト。
- 前記(D)粉末は、銅、錫、及びマンガンのうちいずれか1つ以上の酸化物もしくは水酸化物を含む請求項1から請求項4のうちずれか1項に記載の導電性ペースト。
- 前記(A)銀粉100質量部に対して、前記(D)粉末を0.1~5.0質量部含有する請求項1から請求項5のうちいずれか1項に記載の導電性ペースト。
- 銅の含有量を1としたときの錫の含有量が、質量比で、0.01~0.3である請求項1から請求項6のうちいずれか1項に記載の導電性ペースト。
- 銅の含有量を1としたときのマンガンの含有量が、質量比で、0.01~2.5である請求項1から請求項7のうちいずれか1項に記載の導電性ペースト。
- 前記(A)銀粉の平均粒径が0.1μm~100μmである、請求項1から請求項8のうちいずれか1項に記載の導電性ペースト。
- さらに、(E)酸化コバルトを含有する請求項1から請求項9のうちいずれか1項に記載の導電性ペースト。
- さらに、(F)酸化ビスマスを含有する請求項1から請求項10のうちいずれか1項に記載の導電性ペースト。
- 粘度が50~700Pa・sである請求項1から請求項11のうちいずれか1項に記載の導電性ペースト。
- 請求項1から請求項12のうちいずれか1項に記載の導電性ペーストを基板上に塗布した後、その基板を500~900℃で焼成して得られるプリント配線板。
- 請求項13に記載のプリント配線板上に電子部品をはんだ付けして得られる電子装置。
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| JP2014542187A JP6242800B2 (ja) | 2012-10-19 | 2013-10-18 | 焼結型導電性ペースト |
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| EP13847147.9A EP2911160B1 (en) | 2012-10-19 | 2013-10-18 | Electroconductive paste |
| US14/436,565 US9574091B2 (en) | 2012-10-19 | 2013-10-18 | Conductive paste |
| CN201380054091.0A CN104737238A (zh) | 2012-10-19 | 2013-10-18 | 导电性浆料 |
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| US (1) | US9574091B2 (ja) |
| EP (1) | EP2911160B1 (ja) |
| JP (1) | JP6242800B2 (ja) |
| KR (1) | KR102079148B1 (ja) |
| CN (2) | CN104737238A (ja) |
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| WO2016002362A1 (ja) * | 2014-06-30 | 2016-01-07 | 株式会社村田製作所 | 導電性ペースト、及びガラス物品 |
| WO2017141984A1 (ja) * | 2016-02-17 | 2017-08-24 | ナミックス株式会社 | 導電性ペースト |
| KR20210105404A (ko) | 2018-12-26 | 2021-08-26 | 쇼에이 가가쿠 가부시키가이샤 | 은 페이스트 |
| KR20210105405A (ko) | 2018-12-26 | 2021-08-26 | 쇼에이 가가쿠 가부시키가이샤 | 은 페이스트 |
| KR20210107067A (ko) | 2018-12-26 | 2021-08-31 | 쇼에이 가가쿠 가부시키가이샤 | 은 페이스트 |
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| KR20210105405A (ko) | 2018-12-26 | 2021-08-26 | 쇼에이 가가쿠 가부시키가이샤 | 은 페이스트 |
| KR20210107067A (ko) | 2018-12-26 | 2021-08-31 | 쇼에이 가가쿠 가부시키가이샤 | 은 페이스트 |
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| US12340919B2 (en) | 2018-12-26 | 2025-06-24 | Shoei Chemical Inc. | Silver paste |
Also Published As
| Publication number | Publication date |
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| CN104737238A (zh) | 2015-06-24 |
| KR20150076189A (ko) | 2015-07-06 |
| EP2911160A1 (en) | 2015-08-26 |
| TW201423768A (zh) | 2014-06-16 |
| US20150299477A1 (en) | 2015-10-22 |
| JPWO2014061765A1 (ja) | 2016-09-05 |
| EP2911160A4 (en) | 2016-06-01 |
| EP2911160B1 (en) | 2019-11-06 |
| CN105869704A (zh) | 2016-08-17 |
| TWI618095B (zh) | 2018-03-11 |
| US9574091B2 (en) | 2017-02-21 |
| KR102079148B1 (ko) | 2020-02-19 |
| CN105869704B (zh) | 2018-06-29 |
| JP6242800B2 (ja) | 2017-12-06 |
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