WO2015015833A1 - 内部電極ペースト - Google Patents
内部電極ペースト Download PDFInfo
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- WO2015015833A1 WO2015015833A1 PCT/JP2014/058824 JP2014058824W WO2015015833A1 WO 2015015833 A1 WO2015015833 A1 WO 2015015833A1 JP 2014058824 W JP2014058824 W JP 2014058824W WO 2015015833 A1 WO2015015833 A1 WO 2015015833A1
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- Prior art keywords
- conductor
- internal electrode
- electrode paste
- resin
- powder
- Prior art date
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- 239000002003 electrode paste Substances 0.000 title claims abstract description 54
- 239000004020 conductor Substances 0.000 claims abstract description 89
- 238000005245 sintering Methods 0.000 claims abstract description 39
- 239000011347 resin Substances 0.000 claims abstract description 38
- 229920005989 resin Polymers 0.000 claims abstract description 38
- 239000002904 solvent Substances 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000008235 industrial water Substances 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 7
- 239000001856 Ethyl cellulose Substances 0.000 claims description 6
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 claims description 6
- 229920001249 ethyl cellulose Polymers 0.000 claims description 6
- 235000019325 ethyl cellulose Nutrition 0.000 claims description 6
- 238000010304 firing Methods 0.000 claims description 6
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 26
- 238000009792 diffusion process Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 11
- 238000005259 measurement Methods 0.000 description 10
- 239000000919 ceramic Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- YQCIWBXEVYWRCW-UHFFFAOYSA-N methane;sulfane Chemical compound C.S YQCIWBXEVYWRCW-UHFFFAOYSA-N 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- MWEXRLZUDANQDZ-RPENNLSWSA-N (2s)-3-hydroxy-n-[11-[4-[4-[4-[11-[[2-[4-[(2r)-2-hydroxypropyl]triazol-1-yl]acetyl]amino]undecanoyl]piperazin-1-yl]-6-[2-[2-(2-prop-2-ynoxyethoxy)ethoxy]ethylamino]-1,3,5-triazin-2-yl]piperazin-1-yl]-11-oxoundecyl]-2-[4-(3-methylsulfanylpropyl)triazol-1-y Chemical compound N1=NC(CCCSC)=CN1[C@@H](CO)C(=O)NCCCCCCCCCCC(=O)N1CCN(C=2N=C(N=C(NCCOCCOCCOCC#C)N=2)N2CCN(CC2)C(=O)CCCCCCCCCCNC(=O)CN2N=NC(C[C@@H](C)O)=C2)CC1 MWEXRLZUDANQDZ-RPENNLSWSA-N 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 229910007565 Zn—Cu Inorganic materials 0.000 description 3
- 239000003985 ceramic capacitor Substances 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 229910052763 palladium Inorganic materials 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 238000001107 thermogravimetry coupled to mass spectrometry Methods 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000007606 doctor blade method Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003665 fog water Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- SWELZOZIOHGSPA-UHFFFAOYSA-N palladium silver Chemical compound [Pd].[Ag] SWELZOZIOHGSPA-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229940116411 terpineol Drugs 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Images
Classifications
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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
- H01B1/20—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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F17/0013—Printed inductances with stacked layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2804—Printed windings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/041—Printed circuit coils
- H01F41/043—Printed circuit coils by thick film techniques
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/041—Printed circuit coils
- H01F41/046—Printed circuit coils structurally combined with ferromagnetic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/008—Selection of materials
- H01G4/0085—Fried electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F2017/0066—Printed inductances with a magnetic layer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2804—Printed windings
- H01F2027/2809—Printed windings on stacked layers
Definitions
- the present invention relates to an internal electrode paste, and more particularly to an internal electrode paste used for an internal electrode of a multilayer device such as a ferrite inductor, a multilayer ceramic capacitor, a thermistor, and a piezoelectric element.
- a multilayer device such as a ferrite inductor, a multilayer ceramic capacitor, a thermistor, and a piezoelectric element.
- Patent Document 1 JP 2000-182833 A discloses a paste containing a silver-palladium alloy having a palladium content of 2 to 8% by weight.
- Kai 2000-182832 Patent Document 2 discloses a ferrite sheet in which impurities of chlorine and sulfur are adjusted as a ferrite material of a ferrite inductor.
- Patent Document 2 discloses a paste containing Ag.
- a main object of the present invention is to provide an internal electrode paste that is less likely to cause a short circuit defect due to diffusion of Ag when used for an internal electrode of a laminated device with little cost increase.
- the internal electrode paste according to the present invention is an internal electrode paste that is used for an internal electrode and contains Ag, a resin, and a solvent as a conductor, and the resin is equal to or lower than a sintering start temperature of the conductor when fired in air. It is an internal electrode paste that burns 100% in the temperature range.
- a conductor in which the amount of SO 2 and CO 2 generated from the conductor is 0.05 wt% or less with respect to the total conductor weight in the temperature range above the sintering start temperature of the conductor is used as the conductor. It is preferable to use it.
- the amount of SO 2 and CO 2 generated from the conductor is 0.01 wt% or less with respect to the total conductor weight as a conductor in a temperature range equal to or higher than the sintering start temperature of the conductor. More preferably, a conductor is used. Furthermore, in the internal electrode paste according to the present invention, it is preferable to use water atomized Ag powder having a sintering start temperature of 530 ° C. or higher as the conductor. In the internal electrode paste according to the present invention, it is particularly preferable to use an atomized powder using industrial water as the spray water as the conductor and an ethyl cellulose resin as the resin.
- the diffusion of Ag in the paste is the cause of the short circuit, and attempts to suppress short circuit defects by adding fine palladium particles in the paste and adjusting the amounts of chlorine and sulfur in the ferrite sheet material. There are some, but in all cases, raising the cost is an issue.
- the resin in the internal electrode paste burns 100% in a temperature range below the sintering start temperature of the conductor in the internal electrode when firing in air. Has been found to be suitable.
- the diffusion of Ag can be achieved by designing the composition so that the resin in the internal electrode paste burns 100% in the temperature range below the sintering start temperature of the conductor in the internal electrode paste when firing in the air, thereby reducing the cost. It is possible to reduce short-circuit defects due to. Therefore, with the internal electrode paste according to the present invention, the cost increase is small, and when it is used for the internal electrode of the laminated device, the occurrence of short-circuit failure is suppressed and the short-circuit failure is less likely to occur. Further, it has been newly found that the S component and the C component in the conductor of the internal electrode paste remaining at a high temperature influence the short circuit failure as a factor in the internal electrode paste having a short circuit failure.
- a short circuit defect can be greatly reduced by using a composition design that reduces the S component and C component remaining particularly in the temperature range equal to or higher than the sintering start temperature of the conductor in the internal electrode paste.
- a conductor in which the amount of SO 2 and CO 2 generated from the conductor is 0.05 wt% or less with respect to the total conductor weight in the temperature range above the sintering start temperature of the conductor is used as the conductor. When used, it is possible to further suppress the occurrence of short circuit defects.
- the amount of SO 2 and CO 2 generated from the conductor is 0.01 wt% or less with respect to the total conductor weight as a conductor in a temperature range equal to or higher than the sintering start temperature of the conductor.
- the amount of SO 2 and CO 2 generated from the conductor is 0.05 wt% or less with respect to the total conductor weight in the temperature range above the sintering start temperature of the conductor. Since the amount of SO 2 and CO 2 generated is reduced, the occurrence of short-circuit defects can be further suppressed.
- the internal electrode paste according to the present invention when water atomized Ag powder having a sintering start temperature of 530 ° C. or higher is used as a conductor, a more free organic design becomes possible, and at the same time, even if the Ag powder is reduced in size, The connectivity does not change, and it becomes possible to take measures against a short circuit without increasing the resistance of the internal electrode. Further, in the internal electrode paste according to the present invention, when an atomized powder using industrial water as spray water is used as a conductor and an ethyl cellulose resin is used as a resin, occurrence of short circuit failure can be particularly suppressed.
- an internal electrode paste can be obtained that is less expensive and less likely to cause a short circuit failure due to Ag diffusion when used as an internal electrode of a laminated device.
- FIG. 1 is a perspective view showing an example of a ferrite inductor to which the present invention is applied.
- a multilayer chip coil component 10 as a ferrite inductor shown in FIG. 1 includes a magnetic body 11 made of, for example, a Ni—Zn—Cu ferrite material, a coil 12 formed of an internal electrode paste in the magnetic body 11,
- the ferrite inductor includes a pair of left and right external electrodes 13A and 13B that are connected to the upper and lower electrode portions 12A and 12B of the coil 12 and cover both end faces of the magnetic body 11, and has excellent temperature characteristics.
- the coil 12 includes a coil conductor 121 formed in a plurality of upper and lower stages in the horizontal direction and a via-hole conductor 122 that electrically connects the upper and lower coil conductors 121, and is formed as a rectangular spiral extending in the vertical direction. ing.
- an internal electrode paste used for the coil 12 (coil conductor 121 and via-hole conductor 122) and the electrode portions 12 ⁇ / b> A and 12 ⁇ / b> B
- an internal electrode paste containing Ag, a resin, and a solvent is used as an internal electrode paste.
- the internal electrode paste according to the present invention can be used in which the resin burns 100% in a temperature range equal to or lower than the sintering start temperature of the conductor when fired in air.
- a conductor in which the amount of SO 2 and CO 2 generated from the conductor is 0.05 wt% or less with respect to the total conductor weight in the temperature range above the sintering start temperature of the conductor is used as the conductor. Is preferred.
- this internal electrode paste a conductor whose generation amount of SO 2 and CO 2 from the conductor is 0.01 wt% or less with respect to the total conductor weight in the temperature range higher than the sintering start temperature of the conductor is used as the conductor. More preferably. Furthermore, in this internal electrode paste, it is preferable to use water atomized Ag powder having a sintering start temperature of 530 ° C. or higher as the conductor. Moreover, in this internal electrode paste, it is particularly preferable to use atomized powder using industrial water as spray water as the conductor and use ethylcellulose resin as the resin.
- the resin composition in the internal electrode paste should have a composition design with a low cost increase that burns 100% in the temperature range below the sintering start temperature of the conductor in the internal electrode paste during firing in air. Therefore, it is possible to reduce short-circuit defects due to Ag diffusion. Therefore, with this internal electrode paste, there is little cost increase, and in the ferrite inductor (multilayer chip coil component 10), the occurrence of short-circuit defects is suppressed, and short-circuit defects are less likely to occur.
- a conductor whose generation amount of SO 2 and CO 2 from the conductor is 0.05 wt% or less with respect to the total conductor weight in the temperature range higher than the sintering start temperature of the conductor is used as the conductor. As a result, the occurrence of short-circuit defects can be further suppressed.
- a conductor in which the amount of SO 2 and CO 2 generated from the conductor is 0.01 wt% or less with respect to the total conductor weight in the temperature range above the sintering start temperature of the conductor is used as the conductor. Then, compared with the case where a conductor whose generation amount of SO 2 and CO 2 from the conductor is 0.05 wt% or less with respect to the total conductor weight in a temperature range equal to or higher than the sintering start temperature of the conductor, SO 2 and Since the amount of generated CO 2 is reduced, it is possible to further suppress the occurrence of short circuit defects.
- the internal electrode paste when atomized powder using industrial water as spray water is used as the conductor and ethyl cellulose resin is used as the resin, 0% short-circuit occurrence rate may be obtained, and short circuit failure may occur. Generation can be particularly suppressed.
- a slurry containing a ferrite raw material of Ni—Zn—Cu based ferrite material is formed into a sheet by a doctor blade method to produce a plurality of ceramic green sheets.
- Examples 1 to 3 having compositions (Ag powders A to E, resins A and B, and a solvent) shown in Table 1 are formed on the upper surface of the ceramic green sheet.
- the internal electrode pastes of Comparative Examples 1 to 4 are printed using a screen printing method or the like to form a predetermined coil pattern.
- the Ag powder used in the internal electrode pastes of Examples 1 to 3 and Comparative Examples 1 to 4 is Ag powder A, Ag powder B, Ag powder C, Ag powder D, and Ag powder. There are five types of E.
- the Ag powder A an atomized powder having an average particle diameter of 2.5 ⁇ m and using industrial water as the spray water is used
- the Ag powder B pure water as the spray water having an average particle diameter of 2.5 ⁇ m.
- Atomized powder is used.
- Ag powders C and D wet synthetic powder having an average particle size of about 2.5 ⁇ m is used
- Ag powder E wet synthetic powder having an average particle size of about 2.5 ⁇ m is used.
- a ceramic powder coated with Ag powder was used.
- the sintering start temperature (° C.) shown in Table 2 for Ag powders A to E was a temperature at which the shrinkage amount exceeded 1% by TMA (manufactured by Rigaku).
- TMA manufactured by Rigaku
- the measurement temperature was room temperature to 900 ° C.
- the measurement atmosphere was an air flow rate of 200 ml / min
- the temperature rising rate was 10 ° C./min.
- the gas generation amount (wt%) at a temperature equal to or higher than the sintering start temperature shown in Table 2 of Ag powders A to E is calculated by TG-MS (manufactured by Rigaku) from the amount of gas generation from the powder of Ag powder. It was measured.
- the measurement conditions were a temperature range from room temperature to 900 ° C., a measurement atmosphere at a He flow rate of 150 ml / min, and a temperature increase rate of 1 ° C./min.
- the detection lower limit of TG-MS is 0.01 wt%
- the amount of gas generated was measured for a powder that was below the detection lower limit of TG-MS using a carbon sulfur analyzer (manufactured by Horiba Seisakusho). .
- the measurement values measured with the carbon sulfur analyzer are indicated with an asterisk (*) on the right side.
- the detection limit of the carbon-sulfur analyzer is 0.005 wt%, and the results measured with the carbon-sulfur analyzer are below the detection limit of the carbon-sulfur analyzer. ".
- the resin A an ethyl cellulose resin was used
- the resin B a synthesized acrylic resin was used.
- Measurement method of combustion completion temperature of resins A and B The combustion completion temperatures shown in Table 3 for resins A and B were measured by TG-DTA (manufactured by Rigaku). In this case, as measurement conditions, the measurement temperature was room temperature to 900 ° C., the measurement atmosphere was an air flow rate of 200 ml / min, and the temperature rising rate was 10 ° C./min. Further, the temperature at which the weight loss of the resin A (B) became 99.9% or more was defined as the combustion completion temperature at which the resin A (B) burned 100%.
- terpineol was used as the solvent used in the internal electrode pastes of Examples 1 to 3 and Comparative Examples 1 to 4.
- the internal electrode paste was printed using a screen printing plate, and the average metal thickness of the internal electrodes was 10 ⁇ m.
- the required number of ceramic green sheets on which a predetermined coil pattern is formed are stacked, and ceramic green sheets on which the coil pattern is not formed are stacked on both upper and lower surfaces, and then this is crimped by, for example, a pressure of 98 MPa. A block was formed. Thereby, the coil pattern of each layer is connected by the via hole to form a laminated coil.
- this crimping block was cut into a predetermined size to obtain a laminate.
- the degreased laminate is fired at 900 ° C. to obtain a ferrite sintered body (magnetic body).
- the electrically conductive paste was apply
- Examples 1 and 2 are compositions in which the resin is combusted 100% below the sintering start temperature of Ag powder.
- the short-circuit occurrence rate is 0.00% to 0.04%, and a sufficient short-circuit suppressing effect is seen with respect to Comparative Example 1 having a conventional composition.
- Comparative Examples 1, 2, and 4 the resin has not burned 100% by the Ag powder sintering start temperature, and the short-circuit occurrence rate is high.
- Comparative Example 3 although the resin is 100% combusted, SO 2 and CO 2 are generated from the inside of the powder because the ceramic powder coated with wet synthetic Ag powder is used as the Ag powder. High incidence of shorts.
- the form of Ag powder is not ask
- the atomized powder (Ag powder A) uses an industrial water as a fog water and forms a very thin calcia layer on the surface
- internal electrode Since the resistance value derived from the inorganic impurities in the paste does not increase and the sintering start temperature shifts to the high temperature side, it is more preferable. A higher sintering start temperature is more preferable because the range of resin selection is expanded.
- Japanese Patent Application Laid-Open No. 2009-224201 discloses a conductive paste for a low-temperature fired multilayer substrate. There is a description that “sintering is too early when the thickness is less than 0.5 ⁇ m”, and there is disclosure that “sintering is too early when the diameter is small”. Since the atomized powder produced by using industrial water is coated with calcia on the surface, the sinterability does not change even when the diameter is reduced. Therefore, the corresponding invention of the publication is considered to be an example corresponding to Comparative Example 4 using atomized powder having a relatively low sintering temperature among atomized powder.
- Example 3 an internal electrode paste having a CO 2 generation amount of 0.05 wt% at a temperature equal to or higher than the sintering start temperature was evaluated, and compared with Comparative Example 2, the sintering start temperature of Ag powder was Since it was higher than the firing completion temperature of resin B, the occurrence rate of short circuit was reduced.
- Example 1 corresponds to claims 1 to 5 and has the highest short-circuit suppressing effect.
- Example 2 corresponds to claims 1 to 3 and has the next highest short-circuit suppressing effect.
- Example 3 is claimed. Although it corresponds to 1 and 2, the short suppression effect is seen, but the effect is slightly low.
- the above-described ferrite inductor uses a Ni—Zn—Cu-based ferrite material, but the internal electrode paste according to the present invention is also used for an internal electrode of a ferrite inductor in which another ferrite material is used. It is done.
- the internal electrode paste according to the present invention is used not only for the internal electrodes of ferrite inductors but also for internal electrodes of other multilayer devices such as multilayer ceramic capacitors, thermistors and piezoelectric elements.
- the internal electrode paste according to the present invention is particularly suitably used for internal electrodes of multilayer devices such as ferrite inductors, multilayer ceramic capacitors, thermistors, and piezoelectric elements.
- Multilayer chip coil components (ferrite inductors) 11 Magnetic body 12 Coil 121 Coil conductor 122 Via-hole conductor 12A, 12B Electrode portion 13A, 13B External electrode
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Abstract
Description
また、特許文献1に開示されているようにペースト中にパラジウムの微粒添加や特許文献2に開示されているようにフェライトシート原料中の塩素および硫黄の量の調整によってショート不良を抑制しようとする知見があるが、いずれもコストアップが課題となる。
この発明にかかる内部電極ペーストでは、導体として、導体の焼結開始温度以上の温度域で導体からのSO2およびCO2の発生量が全導体重量に対して0.05wt%以下である導体を使用することが好ましい。
また、この発明にかかる内部電極ペーストでは、導体として、導体の焼結開始温度以上の温度域で導体からのSO2およびCO2の発生量が全導体重量に対して0.01wt%以下である導体を使用することがさらに好ましい。
さらに、この発明にかかる内部電極ペーストでは、導体として、焼結開始温度が530℃以上の水アトマイズAg粉を使用することが好ましい。
また、この発明にかかる内部電極ペーストでは、導体として、噴霧水として工水を使用したアトマイズ粉を使用し、樹脂として、エチルセルロース樹脂を使用することが特に好ましい。
それに対して、この発明では、そのようなショート不良に対して、内部電極ペースト中の樹脂が空気中での焼成時に内部電極中の導体の焼結開始温度以下の温度域で100%燃焼することが好適であることを見出した。そのため、内部電極ペースト中の樹脂が空気中での焼成時に内部電極ペースト中の導体の焼結開始温度以下の温度域で100%燃焼するというコストアップの少ない組成設計にすることによって、Agの拡散によるショート不良を低減することができる。
したがって、この発明にかかる内部電極ペーストでは、コストアップが少なく、積層デバイスの内部電極に用いた場合に、ショート不良の発生が抑制され、ショート不良を起こしにくくなる。
また、ショート不良の内部電極ペーストにおける要因として、高温で残留する内部電極ペーストの導体中のS成分およびC成分がショート不良に影響していることを新たに見出した。そのため、特に内部電極ペースト中の導体の焼結開始温度以上の温度域で残留するS成分およびC成分を低減する組成設計にすることによって、ショート不良を大幅に低減することができる。
この発明にかかる内部電極ペーストでは、導体として、導体の焼結開始温度以上の温度域で導体からのSO2およびCO2の発生量が全導体重量に対して0.05wt%以下である導体を使用すると、ショート不良の発生をさらに抑制することができる。
また、この発明にかかる内部電極ペーストでは、導体として、導体の焼結開始温度以上の温度域で導体からのSO2およびCO2の発生量が全導体重量に対して0.01wt%以下である導体を使用すると、導体の焼結開始温度以上の温度域で導体からのSO2およびCO2の発生量が全導体重量に対して0.05wt%以下である導体を使用する場合と比べて、SO2およびCO2の発生量が少なくなるので、ショート不良の発生をさらに抑制することができる。
さらに、この発明にかかる内部電極ペーストでは、導体として、焼結開始温度が530℃以上の水アトマイズAg粉を使用すると、より自由な有機設計が可能になると同時に、Ag粉を小径化しても焼結性が変わらず、内部電極の抵抗を増加させずにショート不良対策が可能になる。
また、この発明にかかる内部電極ペーストでは、導体として、噴霧水として工水を使用したアトマイズ粉を使用し、樹脂として、エチルセルロース樹脂を使用すると、ショート不良の発生を特に抑制することができる。
この内部電極ペーストでは、導体として、導体の焼結開始温度以上の温度域で導体からのSO2およびCO2の発生量が全導体重量に対して0.05wt%以下である導体を使用することが好ましい。
また、この内部電極ペーストでは、導体として、導体の焼結開始温度以上の温度域で導体からのSO2およびCO2の発生量が全導体重量に対して0.01wt%以下である導体を使用することがさらに好ましい。
さらに、この内部電極ペーストでは、導体として、焼結開始温度が530℃以上の水アトマイズAg粉を使用することが好ましい。
また、この内部電極ペーストでは、導体として、噴霧水として工水を使用したアトマイズ粉を使用し、樹脂として、エチルセルロース樹脂を使用することが特に好ましい。
したがって、この内部電極ペーストでは、コストアップが少なく、フェライトインダクタ(積層型チップコイル部品10)において、ショート不良の発生が抑制され、ショート不良を起こしにくくなる。
Ag粉A~Eの表2に示す焼結開始温度(℃)は、TMA(Rigaku社製)により収縮量が1%を超えた温度とした。この場合、測定条件として、測定温度を室温~900℃とし、測定雰囲気を空気流量200ml/分とし、昇温速度を10℃/分とした。
また、Ag粉A~Eの表2に示す焼結開始温度以上の温度でのガス発生量(wt%)は、TG-MS(Rigaku社製)によりAg粉の粉体からのガス発生量を測定した。この場合、測定条件として、温度範囲を室温~900℃とし、測定雰囲気をHe流量150ml/分とし、昇温速度を1℃/分とした。TG-MSの検出下限は、0.01wt%であるので、TG-MSの検出下限以下だった粉体に関しては、追加で炭素硫黄分析装置(堀場製作所製)を用いてガス発生量を測定した。炭素硫黄分析装置で測定した測定値については、右側に※を付けて記載した。また、炭素硫黄分析装置の検出下限は、0.005wt%であり、その炭素硫黄分析装置で測定した結果がその炭素硫黄分析装置の検出下限以下のものについては、表2に「N.D.」と記載した。
樹脂A、Bの表3に示す燃焼完了温度は、TG-DTA(Rigaku社製)により測定した。この場合、測定条件として、測定温度を室温~900℃とし、測定雰囲気を空気流量200ml/分とし、昇温速度を10℃/分とした。また、樹脂A(B)の重量減少が99.9%以上になった温度を、樹脂A(B)の100%燃焼した燃焼完了温度と定義した。
表1に示す組成物を各種調合し、プラネタリーミキサーで撹拌後、ロール分散により実施例1~3および比較例1~4の内部電極ペーストを得た。
ここで、ショート不良率の測定については、焼成して得た積層型チップコイル部品(フェライトインダクタ)10000個のL値を測定し、L値が基準よりも20%低下しているものをショート発生品とみなし、ショート発生率を算出した。
一方、比較例1、2、4に関しては、Ag粉の焼結開始温度までに樹脂が100%燃焼しておらず、ショート発生率が高くなっている。
また、比較例3に関しては、樹脂は100%燃焼しているものの、Ag粉として湿式合成Ag粉をセラミックコートしたものを用いているため粉体内部からのSO2、CO2発生が見られ、ショート発生率が高い。
以上の結果から、粉体からのガス発生量を減らすほど、ショート発生率の低減に効果が見込めることは明らかである。
11 磁性体
12 コイル
121 コイル導体
122 ビアホール導体
12A、12B 電極部
13A、13B 外部電極
Claims (5)
- 内部電極に用いられ、導体としてAgと、樹脂と、溶剤とを含む内部電極ペーストであって、
前記樹脂が空気中での焼成時に前記導体の焼結開始温度以下の温度域で100%燃焼する、内部電極ペースト。 - 前記導体として、前記導体の焼結開始温度以上の温度域で前記導体からのSO2およびCO2の発生量が全導体重量に対して0.05wt%以下である導体を使用する、請求項1に記載の内部電極ペースト。
- 前記導体として、前記導体の焼結開始温度以上の温度域で前記導体からのSO2およびCO2の発生量が全導体重量に対して0.01wt%以下である導体を使用する、請求項1に記載の内部電極ペースト。
- 前記導体として、焼結開始温度が530℃以上の水アトマイズAg粉を使用する、請求項1ないし請求項3のいずれかに記載の内部電極ペースト。
- 前記導体として、噴霧水として工水を使用したアトマイズ粉を使用し、前記樹脂として、エチルセルロース樹脂を使用する、請求項1ないし請求項4のいずれかに記載の内部電極ペースト。
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