WO2010058496A1 - セラミック組成物、セラミックグリーンシート、及びセラミック電子部品 - Google Patents
セラミック組成物、セラミックグリーンシート、及びセラミック電子部品 Download PDFInfo
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- WO2010058496A1 WO2010058496A1 PCT/JP2009/003402 JP2009003402W WO2010058496A1 WO 2010058496 A1 WO2010058496 A1 WO 2010058496A1 JP 2009003402 W JP2009003402 W JP 2009003402W WO 2010058496 A1 WO2010058496 A1 WO 2010058496A1
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- 239000000919 ceramic Substances 0.000 title claims abstract description 238
- 239000000203 mixture Substances 0.000 title claims abstract description 176
- 239000011521 glass Substances 0.000 claims abstract description 109
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 7
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 7
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 29
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 29
- 229910002367 SrTiO Inorganic materials 0.000 claims description 28
- 239000004020 conductor Substances 0.000 claims description 24
- 239000000843 powder Substances 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052709 silver Inorganic materials 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 229910052788 barium Inorganic materials 0.000 claims description 2
- 229910052796 boron Inorganic materials 0.000 claims description 2
- 238000010304 firing Methods 0.000 abstract description 47
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 5
- 239000002131 composite material Substances 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 229910002971 CaTiO3 Inorganic materials 0.000 abstract 1
- 229910002370 SrTiO3 Inorganic materials 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 238000005245 sintering Methods 0.000 description 44
- 239000000758 substrate Substances 0.000 description 23
- 238000009413 insulation Methods 0.000 description 15
- 239000002994 raw material Substances 0.000 description 14
- 239000003990 capacitor Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 12
- 230000007423 decrease Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 239000000654 additive Substances 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000002844 melting Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000003985 ceramic capacitor Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 description 4
- 239000005388 borosilicate glass Substances 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000007606 doctor blade method Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910002077 partially stabilized zirconia Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000007847 structural defect Effects 0.000 description 2
- 0 CC(C)CC1*C=CC1 Chemical compound CC(C)CC1*C=CC1 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
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- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/12—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances ceramics
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Definitions
- the present invention relates to a ceramic composition, a ceramic green sheet, and a ceramic electronic component, and more particularly, a ceramic composition for low-temperature firing having a high dielectric constant, a ceramic green sheet using the ceramic composition, and the ceramic composition
- the present invention relates to a ceramic electronic component such as a ceramic multilayer substrate and a composite LC component.
- high-frequency dielectric ceramics are widely used, for example, for dielectric resonators and dielectric substrates for MICs.
- This type of high frequency dielectric ceramic is required to have a large relative dielectric constant ⁇ r and Q value in order to reduce the size.
- high-frequency dielectric ceramics have the disadvantage that when high-melting-point tungsten or molybdenum is used as the conductor material, these high-melting-point metals have a large specific resistance, so that the high-frequency characteristics of ceramic multilayer substrates are particularly limited. And it is expensive. For this reason, it is required to use a low-melting-point low-melting metal such as Ag or Cu as the conductor material.
- xBaO—yTiO 2 —zReO 3/2 (where x, y and z represent mol%, and 8 ⁇ x ⁇ 18, 52.5 ⁇ y ⁇ 65, and 20 ⁇ z ⁇ 40)
- X + y + z 100
- Re is a rare earth element.
- the BaO—TiO 2 —ReO 3 / 2- based ceramic composition represented by 10 to 45 wt% and alumina is 5 to 40 wt% 4 to 17.5 wt% B 2 O 3 , 28 to 50 wt% SiO 2 , 0 to 20 wt% Al 2 O 3 and 36 to 50 wt% MO (wherein MO is CaO, At least one selected from MgO, SrO, and BaO.) And 40 to 65% by weight of a borosilicate glass composition, and the BaO—TiO 2 —ReO 3 / 2- based ceramic composition And the total amount of alumina
- Patent Document 1 has a relatively high relative dielectric constant ⁇ r of about 15, in order to meet the demand for further miniaturization of module products and the like today, a higher dielectric constant is required.
- the rate ⁇ r is required.
- the present invention has been made in view of such circumstances, and can suppress the shrinkage behavior at the time of firing, can dramatically improve the dielectric characteristics as compared with the conventional ceramic composition, and can ensure reliability.
- An object is to provide a ceramic green sheet and a ceramic electronic component using the same.
- the inventors of the present invention conducted intensive research to achieve the above object.
- SrTiO 3 or CaTiO 3 having a high relative dielectric constant ⁇ r was added in a predetermined range, and a specific firing was further performed.
- the binder component in a predetermined amount or less, it is easy to control the shrinkage behavior of the ceramic sintered body during firing, and a good dielectric constant with a relative dielectric constant ⁇ r of 40 or more and a Q value of 750 or more. It was found that a ceramic composition for low-temperature firing having characteristics can be obtained.
- the glass composition itself has a function as a sintering aid that generates a liquid phase and promotes sintering between particles, but because the relative dielectric constant ⁇ r is low, Even if SrTiO 3 or CaTiO 3 having a high rate ⁇ r is added, it becomes difficult to obtain a ceramic composition having a desired high relative dielectric constant.
- the ceramic composition according to the present invention is a B 2 O 3 —SiO 2 —Al 2 O 3 —MO glass composition (where M is Ca, At least one selected from Mg, Sr, and Ba, B 2 O 3 : 4 to 17.5 wt%, SiO 2 : 28 to 50 wt%, Al 2 O 3 : 0 to 20 wt% , MO: 36 to 50% by weight)) and 24 to 40% by weight, and at least one of SrTiO 3 and CaTiO 3 is contained by 46 to 75.4% by weight, and in terms of CuO At least one selected from Mn, Zn and Co, containing 0.1 to 5.0% by weight of Cu oxide and 0.5 to 7.0% by weight of Ca oxide in terms of CaO The metal oxides contained are converted to MnO and ZnO, respectively. It is characterized by being 10% by weight or less (including 0% by weight) in terms of CoO.
- the ceramic green sheet according to the present invention is characterized in that the ceramic composition is formed into a sheet shape.
- the ceramic electronic component according to the present invention is characterized by having a first ceramic layer made of a sintered body of the ceramic composition.
- the ceramic electronic component of the present invention is characterized in that the first ceramic layer and a second ceramic layer having a relative dielectric constant lower than that of the first ceramic layer are laminated.
- the second ceramic layer contains 51 to 60% by weight of ceramic powder, and a B 2 O 3 —SiO 2 —Al 2 O 3 —MO glass composition
- M represents at least one selected from Ca, Mg, Sr, and Ba
- B 2 O 3 5 to 17.5 wt%
- SiO 2 28 to 44 wt%
- Al 2 O 3 0 to 20% by weight
- MO 36 to 50% by weight.
- the ceramic electronic component of the present invention is characterized in that the ceramic powder is Al 2 O 3 .
- the ceramic electronic component of the present invention is characterized by having a conductor pattern mainly composed of Ag or Cu.
- the B 2 O 3 —SiO 2 —Al 2 O 3 —MO-based glass composition blended at a predetermined ratio is contained in an amount of 24 to 40% by weight, and among SrTiO 3 and CaTiO 3 46 to 75.4% by weight of at least one kind, 0.1 to 5.0% by weight of Cu oxide in terms of CuO, and 0.5 to 7.0% by weight of Ca oxide in terms of CaO
- a metal oxide containing at least one selected from Mn, Zn, and Co is 10% by weight or less (however, 0% by weight is included) in terms of MnO, ZnO, and CoO. Therefore, it is possible to obtain a ceramic composition with improved dielectric properties while making it easy to control the shrinkage behavior of the ceramic sintered body during firing, and to achieve both the control of the shrinkage behavior and the dielectric properties. It is possible to obtain.
- a ceramic composition having a good dielectric constant ⁇ r of 40 or more, a Q value of 750 or more, an insulation resistance logIR of 10 or more, and a good sinterability that can easily control the shrinkage behavior during firing. Can be obtained.
- the first ceramic layer and the second ceramic layer having a relative dielectric constant lower than that of the first ceramic layer are laminated.
- the ceramic substrate can be further miniaturized. It becomes possible.
- the ceramic composition which comprises the 1st ceramic layer and the ceramic composition which comprises the 2nd ceramic layer are similar in the component composition of a glass composition, the characteristic variation and characteristic by mutual diffusion at the time of baking Since variations and the like are unlikely to occur and the thermal expansion coefficients are also approximate, structural defects such as delamination are unlikely to occur. Furthermore, since it is not necessary for the second ceramic layer to contain an alkali metal element, it is possible to avoid a decrease in resistance characteristics due to a reaction with a resistor constituting the resistance element.
- FIG. 1 is a perspective view of a ceramic green sheet according to the present invention.
- 1 is a perspective view illustrating a composite LC component as an embodiment (first embodiment) of a ceramic electronic component according to the present invention.
- FIG. 3 is a circuit diagram showing an equivalent circuit of FIG. 2. It is a disassembled perspective view of the ceramic sintered compact for demonstrating the manufacturing method of FIG. It is sectional drawing of the multilayer module as 2nd Embodiment of the ceramic electronic component which concerns on this invention.
- the ceramic composition according to the present invention comprises (1) a B 2 O 3 —SiO 2 —Al 2 O 3 —MO glass composition (borosilicate glass composition; hereinafter simply referred to as “glass composition”). (2) at least one of SrTiO 3 and CaTiO 3 is contained at 46 to 75.4% by weight, (3) Cu oxide and Ca oxide (hereinafter referred to as the first) "Sintering aid component”) 0.1 to 5.0% by weight in terms of CuO and 0.5 to 7.0% by weight in terms of CaO, respectively (4) at least from Mn, Zn, Co
- the oxide containing one kind hereinafter referred to as “second sintering aid component” is prepared to be 10% by weight or less (however, 0% by weight is included).
- the element M in the glass composition is at least one selected from Ca, Mg, Sr, and Ba, and its component composition is B 2 O 3 : 4 to 17.5 wt%, SiO 2 : 28 to 50% by weight, Al 2 O 3 : 0 to 20% by weight, MO: 36 to 50% by weight.
- the ceramic composition of the present invention has the above-described component composition, it can easily control the shrinkage behavior of the ceramic sintered body during firing, and has a high relative dielectric constant ⁇ r and Q value, and is subjected to high temperature and high humidity. However, it is possible to obtain a highly reliable ceramic composition that can withstand a long time.
- the sintered ceramic body after firing should ensure a dimensional accuracy of 99% or more in the XY direction with respect to the ceramic molded body before firing. And having a relative dielectric constant ⁇ r of 40 or more, a Q value of 750 or more, and a highly reliable ceramic composition having an insulation resistance logIR of 10 or more even when left for a long time under high temperature and high humidity. .
- the content of the glass composition Is required to be at least 24% by weight. That is, when the content of the glass composition is reduced to less than 24% by weight, the flowability of the glass is reduced during firing, so that the ceramic sintered body is easily contracted. In addition, the sinterability is also lowered, and it may be difficult to sinter at a low temperature.
- the content of the glass composition exceeds 40% by weight, the content of the glass composition having a low relative dielectric constant becomes excessive, which may reduce the relative dielectric constant ⁇ r of the entire ceramic composition.
- the composition components are blended so that the content of the glass composition is 24 to 40% by weight.
- (A) B 2 O 3 B 2 O 3 is added to lower the softening temperature and promote viscous flow.
- the content of B 2 O 3 in the glass composition is less than 4% by weight, the content is too small, For this reason, there exists a possibility that glass viscosity may become high and may cause a sintering defect.
- the content of B 2 O 3 in the glass composition exceeds 17.5% by weight, the chemical stability of the glass composition deteriorates. As a result, when it is left for a long time under high temperature and high humidity, the insulation resistance logIR May decrease and reliability may be impaired.
- the composition components are blended so that the content of B 2 O 3 in the glass composition is 4 to 17.5% by weight, preferably 5 to 10% by weight.
- SiO 2 SiO 2 contributes to the stability of the glass composition.
- the content of SiO 2 in the glass composition is less than 28% by weight, the chemical stability is deteriorated. As a result, under high temperature and high humidity. If it is left for a long time, the insulation resistance may be lowered and the reliability may be impaired.
- the content of SiO 2 in the glass composition exceeds 50% by weight, the content is excessive and the glass viscosity is increased, and as a result, there is a possibility of causing poor sintering.
- the composition components are blended so that the content of SiO 2 in the glass composition is 28 to 50% by weight, preferably 38 to 48% by weight.
- (C) Al 2 O 3 Al 2 O 3 is added as necessary to stabilize the glass composition, but if the content of Al 2 O 3 in the glass composition exceeds 20% by weight, crystallization becomes difficult and the Q value is increased. There is a risk of lowering.
- the composition component is blended.
- MO MO is Ca, Mg, Sr, and / or Ba
- MO MO is added to lower the softening temperature and promote viscous flow like B 2 O 3 , but the MO content in the glass composition If it is less than 36% by weight, the content is too small, and therefore the glass viscosity is increased, which may cause poor sintering.
- MO content in the glass composition exceeds 50% by weight, the chemical stability of the glass composition deteriorates. As a result, the insulation resistance logIR decreases when left for a long time under high temperature and high humidity. There is a risk of damage.
- the composition components are blended so that the MO content in the glass composition is 36 to 50% by weight, more preferably 40 to 46% by weight.
- the content of the entire glass composition is 24 to 40% by weight
- the composition range of the glass component is B 2 O 3 : 4 to 17.5% by weight (preferably 5 to 10 wt%), SiO 2 : 28 to 50 wt% (preferably 38 to 48 wt%, Al 2 O 3 : 0 to 20 wt% (preferably 4 to 10 wt%), MO: 36 to 50 wt% % (40 to 46% by weight), in combination with other additives, the desired effects can be obtained.
- SrTiO 3 and CaTiO 3 SrTiO 3 has a relative dielectric constant ⁇ r of 250, and CaTiO 3 has a relative dielectric constant ⁇ r of 170, both of which have a high relative dielectric constant ⁇ r. Therefore, by adjusting the blending amount with the glass composition, The relative dielectric constant ⁇ r can be increased while controlling the shrinkage behavior of the ceramic sintered body during firing.
- the total content of SrTiO 3 and CaTiO 3 is 46 to 75.4% by weight, thereby achieving both the control of the shrinkage behavior and the improvement of the dielectric properties. Yes.
- the glass composition itself has a function as a sintering aid that generates a liquid phase and advances the sintering of particles, but has a low relative dielectric constant ⁇ r.
- a sintering aid that generates a liquid phase and advances the sintering of particles, but has a low relative dielectric constant ⁇ r.
- the liquid phase sintering action of the glass composition can be promoted, thereby suppressing the content of the glass composition to 40% by weight or less.
- SrTiO 3 or CaTiO 3 it becomes possible to obtain a ceramic composition having a high relative dielectric constant that can be fired at a low temperature.
- the Q value may be lowered.
- the Cu oxide content is 0.1 to 5.0% by weight in terms of CuO
- the Ca oxide is 0.5 to 7.0% by weight in terms of CaO. ing.
- Second sintering aid component In addition to the first sintering aid component, metal oxidation containing at least one selected from Mn, Co, and Zn as the second sintering aid component It is possible to further improve the relative dielectric constant ⁇ r by adding a substance.
- the second sintering aid component is added in order to obtain a higher relative dielectric constant.
- these second sintering aid components can be contained in a range of 10% by weight or less in terms of MnO, CoO and ZnO, respectively.
- FIG. 1 is a perspective view of a ceramic green sheet 1 obtained using the above ceramic composition.
- the ceramic green sheet 1 can be easily manufactured as follows.
- B 2 O 3 , SiO 2 , Al 2 O 3 , MO at least one of CaO, BaO, SrO, and MgO
- SrTiO 3 and CaTiO 3 the first The sintering auxiliary component and, if necessary, the second sintering auxiliary component are prepared and weighed so as to obtain a predetermined component composition. Then, the weighed material is put into a ball mill together with a grinding medium such as PSZ (partially stabilized zirconia) balls, and is wet-mixed for a predetermined time and pulverized. Next, this pulverized product is evaporated to dryness and then calcined at a predetermined temperature for about 2 hours to obtain a calcined powder (ceramic composition).
- a grinding medium such as PSZ (partially stabilized zirconia) balls
- a binder, a solvent, and a plasticizer are added to the calcined powder and wet pulverized to form a slurry, which is then molded using a molding method such as a doctor blade method, thereby obtaining a predetermined thickness.
- a ceramic green sheet molded into a can be produced.
- FIG. 2 is a perspective view of the laminated LC component 20 according to one embodiment (first embodiment) of a ceramic electronic component.
- the laminated LC component 20 is formed with a circuit constituting an inductance L and a capacitance C inside the ceramic sintered body 2.
- the external electrodes 3a and 3b are formed at both ends of the ceramic sintered body 2, and the external electrodes 4a and 4b are formed at the substantially central portion. 3 is formed as an equivalent circuit LC resonance circuit.
- rectangular ceramic green sheets 5a to 5m manufactured by the above method are prepared.
- a laser processing machine is used so that the ceramic green sheets 5c to 5k can be electrically connected, and via holes 6a to 6d are formed at predetermined positions of the ceramic green sheets 5c to 5k.
- a conductive paste mainly composed of Ag or Cu is screen-printed to form capacitor conductor patterns 7a to 7c and coil conductor patterns 8a to 8d.
- the ceramic green sheets 5c to 5k are laminated, whereby the coil conductor patterns 8a to 8d are electrically connected in a coil shape to form a coil conductor.
- the capacitor conductive patterns 7a to 7c and the ceramic green sheets 5f to 5h form a capacitance portion.
- the ceramic green sheets 5a and 5b on which the conductor pattern is not formed and the ceramic green sheets 5l and 5m are sandwiched and pressed to produce a ceramic laminate.
- a constraining layer containing an inorganic material that does not sinter at the sintering temperature (eg, 900 ° C.) of the ceramic laminate eg, a ceramic green sheet (alumina green sheet having a melting point of 1500 ° C. or more as a main component)
- the ceramic sintered body 2 is manufactured. That is, the ceramic green sheets 5a to 5m formed by forming a ceramic composition into a sheet are sintered to form ceramic layers having a high relative dielectric constant, respectively, as well as capacitor conductor patterns 7a to 7c and coil conductor patterns 8a to 8d.
- the via holes 6a to 6d are fired simultaneously with the ceramic green sheets 5a to 5m to form internal electrodes, that is, capacitor internal electrodes and coil conductors.
- the constraining layer since the constraining layer is disposed on at least one main surface of the ceramic laminate, the constraining layer controls the shrinkage behavior in the main surface direction (XY direction) of the ceramic laminate. As a result, it is possible to obtain the ceramic sintered body 2 with high dimensional accuracy and less warpage.
- the external electrodes 3a to 4b are formed by a thin film forming method such as application / baking of conductive paste, vapor deposition, plating, or sputtering. In this way, the laminated LC component 20 is manufactured.
- the ceramic sintered body 2 is formed of the above ceramic composition, a low melting point metal mainly composed of Ag or Cu as an internal electrode material can be used. It can be produced by simultaneous firing at a low temperature. Then, it is possible to obtain the laminated LC component 20 which is controlled in the shrinkage behavior of the ceramic sintered body 2 and has a large relative dielectric constant ⁇ r and Q value and excellent dielectric properties and excellent reliability.
- FIG. 5 is a cross-sectional view of a ceramic multilayer module 30 schematically showing a second embodiment of the ceramic electronic component according to the present invention.
- This ceramic multilayer module 30 has electronic component elements 19 to 21 arranged on a ceramic multilayer substrate 10.
- Examples of the electronic component elements 19 to 21 include semiconductor devices and chip type multilayer capacitors.
- the ceramic multilayer substrate 10 includes a second ceramic layer group 12a having a relative dielectric constant ⁇ r lower than that of the first ceramic layer group 11 on both surfaces of the first ceramic layer group 11 made of a sintered body of the ceramic composition. , 12b are provided.
- the first ceramic layer group 11 is formed by laminating a plurality of ceramic layers, and internal electrodes 13 and 14 are provided between the ceramic layers, thereby forming capacitor units C1 and C2.
- via holes 17 and 18 and internal wirings 15 and 16 are appropriately formed in the second ceramic layer groups 12a and 12b and the first ceramic layer group 11 as necessary.
- the electronic component elements 19 to 21 and the capacitor units C1 and C2 are electrically connected by the via holes 17 and 18 and the internal wirings 15 and 16 to form a ceramic multilayer module 30.
- the first ceramic layer group 11 is formed of the above-described ceramic composition having a high relative dielectric constant (hereinafter referred to as “first ceramic composition”), and the second The ceramic layer groups 12a and 12b are formed of a second ceramic composition having a relative dielectric constant ⁇ r lower than that of the first ceramic composition.
- the second ceramic composition has a component composition similar to that of the first ceramic composition.
- the second ceramic composition contains 51 to 60% by weight of ceramic powder, and a B 2 O 3 —SiO 2 —Al 2 O 3 —MO-based glass composition (hereinafter referred to as “second glass”). Of 40 to 49% by weight ”.
- the reason why the content of the second glass composition is 40 to 49% by weight is as follows.
- the content of the second glass composition exceeds 49% by weight, crystallization of the glass proceeds excessively, and there is a possibility that the second ceramic layer groups 12a and 12b after firing may be distorted.
- the content of the second glass composition is less than 40% by weight, the relative dielectric constant ⁇ r cannot be sufficiently lowered.
- the second ceramic composition is blended so that the second glass composition is 40 to 49% by weight and the remainder is composed of ceramic powder.
- each component composition of the second glass composition is the glass composition of the first ceramic composition except that the lower limit value of B 2 O 3 is 5 wt% and the upper limit value of SiO 2 is 44 wt%. Is the same.
- the lower limit value of B 2 O 3 was set to 5% by weight in order to avoid the Q value of the second ceramic layer groups 12a and 12b from being lowered, and the upper limit value of SiO 2 was set to 44% by weight. The reason is that the sinterability may be improved too much and the relative dielectric constant ⁇ r may become too high.
- Al 2 O 3 is preferred.
- the second ceramic layer groups 11a and 11b having a relative dielectric constant ⁇ r lower than that of the first ceramic layer group 12 are formed of the second ceramic composition similar to the first ceramic composition.
- characteristic variation and characteristic variation due to mutual diffusion during firing are less likely to occur.
- the first ceramic composition and the second ceramic composition also have similar thermal expansion coefficients, so that structural defects such as delamination are unlikely to occur.
- the second ceramic layer groups 11a and 11b do not need to contain an alkali metal element, for example, in the case of having a resistance element, avoiding a decrease in resistance characteristics due to a reaction with a resistor constituting the resistance element is avoided. can do.
- the ceramic multilayer module 30 can be easily surface-mounted on a printed circuit board or the like using the lower surface side.
- the internal electrodes 13, 14 and the internal wirings 15, 16 and the via holes 17, 18 are It is possible to perform simultaneous firing using a low-resistance and inexpensive low melting point metal such as Ag or Cu. That is, the capacitor units C1 and C2 can be configured using the co-fired ceramic multilayer substrate, and the module can be reduced in size.
- the ceramic multilayer module 30 since the first ceramic layer group 11 uses the first ceramic composition, the ceramic multilayer module 30 has a high relative dielectric constant ⁇ r and Q value, excellent reliability, and good sinterability. Can be obtained.
- the ceramic multilayer substrate 10 is fired by disposing a constraining layer on at least one main surface of the second ceramic layer group 12a, 12b by the same method as in the first embodiment.
- a ceramic sintered body with controlled shrinkage behavior during firing can be easily produced.
- the internal electrodes 13 and 14 adjacent in the thickness direction for taking out the electrostatic capacitance are embedded in the first ceramic layer group 11, an internal electrode having a relatively small area can be used as a large static electrode. Electric capacity can be obtained, and downsizing can be promoted. That is, a conductor for wiring is arranged on the second ceramic layer group 11a which is a low dielectric constant layer, and an element such as a capacitor or a filter is arranged on the first ceramic layer group which is a high dielectric constant layer. Thus, the ceramic substrate can be further reduced in size.
- the laminated LC component 20 and the ceramic multilayer module 30 have been described.
- the present invention can be applied to various chip-type multilayer electronic components such as a type multilayer dielectric antenna.
- SrTiO 3 , CuO, and CaCO 3 were prepared.
- the glass composition content is 36% by weight
- the SrTiO 3 content is 56% by weight
- the CuO content is 3.0% by weight
- the CaCO 3 content is 5.0% by weight in terms of CaO.
- these glass compositions, SrTiO 3 , CuO, and CaCO 3 were weighed.
- ceramic green sheets were laminated to produce a ceramic laminate, and a constraining layer of alumina green sheets was placed on both sides of the ceramic laminate and crimped to produce a crimped body having a length of 55 mm, a width of 75 mm, and a thickness of 1 mm. .
- a firing process is performed for 10 minutes at a firing temperature of 870 ° C. in an air atmosphere, and then the constraining layer is removed, and a ceramic sintered body (white substrate) of sample numbers 1 to 19 having a thickness of 0.65 mm Was made.
- this pressure-bonded body was subjected to a firing treatment in an air atmosphere at a firing temperature of 870 ° C. for 10 minutes, after which the constraining layer was removed, and a ceramic sintered body in which internal electrodes were embedded was produced.
- an Ag paste containing Ag as a main component is prepared, and the Ag paste is applied to both ends of the ceramic sintered body and baked at a temperature of 800 ° C. to form external electrodes.
- a capacitor was produced.
- the outer dimensions of the produced multilayer ceramic capacitor were 8 mm in length, 6 mm in width, 0.5 mm in thickness, 3 effective layers, and 4 mm 2 in effective electrode area.
- sample evaluation Each sample (white substrate) of sample numbers 1 to 19 was evaluated for sinterability and shrinkage behavior during firing.
- the red ink was dropped on the sample, and the sample in which the red ink stain occurred was judged to be poorly sintered.
- the shrinkage behavior was evaluated by calculating the shrinkage rate as follows. That is, the longitudinal and lateral lengths of the ceramic laminate before sintering and the longitudinal and lateral lengths of the sintered ceramic body after sintering are measured according to the following formulas (1) and (2). Then, the vertical direction shrinkage rate and the horizontal direction shrinkage rate were calculated, and then the shrinkage rate was calculated by Equation (3).
- PCT pressure cooker test
- Table 1 shows the component composition of the glass composition of each sample
- Table 2 shows the ceramic composition and measurement results of each sample.
- Sample No. 5 was sintered poorly. This is probably because the CaO content in the glass composition was as low as 35.0% by weight and the glass viscosity was increased.
- Sample No. 8 has an insulation resistance logIR after PCT as low as 4.8, and it was found that reliability was lowered. This is presumably because the content of CaO in the glass composition was as high as 55.0% by weight, and the chemical stability of the glass composition was deteriorated.
- Sample number 9 was poorly sintered. This content of B 2 O 3 in the glass composition is as small as 2.0 wt%, is believed to be due to the glass viscosity becomes high.
- Sample No. 13 was found to have a low insulation resistance logIR after PCT of 4.8, leading to a decrease in reliability. This is thought to be because the chemical stability of the glass composition was deteriorated because the content of CaO in the glass composition was as high as 52.0% by weight but the content of SiO 2 was as low as 26.0% by weight. .
- Sample number 16 was poorly sintered. This is presumably because the glass viscosity increased because the SiO 2 content in the glass composition was as high as 53.0% by weight.
- sample numbers 1 to 4, 6, 7, 10, 11, 14, 15, 17, and 18 have the glass composition in the range of the present invention, and the glass composition in the ceramic composition. 36% by weight, SrTiO 3 content is 56% by weight, CuO content is 3.0% by weight, and CaO content is 5.0% by weight, all within the scope of the present invention. Therefore, it was found that the sinterability is good and the shrinkage rate is 99% or more, and the shrinkage behavior during firing can be suppressed. Furthermore, it can be seen that the dielectric constant ⁇ r is 40 or more, the Q value is 750 or more, and desired desirable dielectric characteristics can be obtained, and further, the insulation resistance logIR after PCT is 10 or more to ensure reliability. It was.
- Example 2 the composition of the glass composition was kept constant, samples having different contents of the glass composition, SrTiO 3 , and the first sintering aid component (CuO and CaO) were prepared, and the characteristics were evaluated. .
- Example preparation B 2 O 3 , SiO 2 , Al 2 O 3 , and CaO were prepared as glass raw materials, and SrTiO 3 , CuO, and CaCO 3 were prepared as additives (fillers) other than the glass raw materials.
- the glass raw material is weighed so that the content of the glass composition is the sample number G1 (within the scope of the present invention) in Table 1, so that the total content of the ceramic composition is Table 3.
- the additive material was weighed. Note that the CaCO 3 were weighed so as to content shown in Table 3 in terms of CaO.
- Table 3 shows component compositions of sample numbers 21 to 53.
- Sample Nos. 21 to 23 had a shrinkage rate of 98.14 to 98.60, which was worse than 99.0%. This is probably because the glass composition content is as low as 20% by weight, so that the fluidity of the glass is lowered during firing, and the ceramic sintered body easily contracts. Moreover, since the content of the glass composition was as low as 20% by weight, firing at a low temperature of 870 ° C. was difficult, resulting in poor termination.
- Sample Nos. 29 to 31 contain CaO but no CuO, so the relative dielectric constant ⁇ r is 24.7 to 32.4 and 40 or less, and the Q value is 531 to 667 and 750 or less. It was found that the desired dielectric properties could not be obtained.
- Sample No. 34 was found to have a low relative dielectric constant ⁇ r of 34.8 because the CaO content was too low at 0.1% by weight, so that a desired high relative dielectric constant could not be obtained.
- Sample Nos. 39 and 44 have an excessive CaO content of 10.0% by weight, and it has been found that the relative permittivity ⁇ r and Q value are decreased.
- Sample No. 47 was found to have a Q value as low as 584 because the CuO content was excessive at 7.0% by weight, and a sufficiently large Q value could not be obtained.
- sample numbers 24 to 28, 32, 33, 35 to 38, 40 to 43, 45, 46, and 48 to 50 have a glass composition content of 24 to 40% by weight and a SrTiO 3 content of 48. ⁇ 75.4 wt%, CuO content of 0.1 to 5.0 wt%, and CaO content of 0.5 to 7.0 wt% are all within the scope of the present invention. It was found that the cohesiveness was good and the shrinkage rate was 99% or more, and the shrinkage behavior during firing could be suppressed. Furthermore, the dielectric constant ⁇ r is 40 or more and the Q value is 750 or more, so that desired good dielectric characteristics can be obtained, and the insulation resistance logIR after the PCT test is 10 or more, and reliability can be secured. I understood.
- Example 3 the composition of the glass composition, the content of the first sintering aid component (CuO and CaO) is constant, and the content of the second sintering aid component (MnO, CoO or ZnO) Samples with different amounts were prepared and evaluated for properties.
- Example preparation B 2 O 3 , SiO 2 , Al 2 O 3 , and CaO are prepared as glass raw materials, and SrTiO 3 , CuO, CaCO 3 , MnCO 3 , CoO, and ZnO are prepared as additives (fillers) other than the glass raw materials. did.
- the glass raw material is weighed so that the content of the glass composition is the sample number G1 (within the scope of the present invention) in Table 1, so that the total content of the ceramic composition is Table 5.
- the additive material was weighed. Note that the CaCO 3 and MnCO 3 were weighed so that the content shown in Table 5 in terms of CaO and MnO terms.
- Table 5 shows component compositions of sample numbers 61 to 75.
- Sample Nos. 61 to 63 contain 5% by weight of the second sintering aid component, but do not contain the first sintering aid component (CuO and CaO), so that the relative dielectric constant ⁇ r And the Q value was found to be low. That is, it was confirmed that the first sintering aid component is indispensable in the composition system of the present invention.
- Sample Nos. 67, 71 and 75 contain CuO 3.0% by weight and CaO 5.0% by weight within the scope of the present invention, but the SrTiO 3 content is as low as 41% by weight, Since the content of MnO, CoO, or ZnO is too high at 15% by weight, it has been found that the insulation resistance logIR is extremely reduced to 6.0 to 7.6 when left for a long time under high temperature and high humidity.
- Sample Nos. 64 to 66, 68 to 70, and 72 to 74 have a SrTiO 3 content of 46.0 to 55.0% by weight and a second sintering aid component content of 1.0. Since it is in the range of the present invention to ⁇ 10.0 wt%, it was found that the sinterability is good, and the shrinkage rate is 99% or more, and the shrinkage behavior during firing can be suppressed. Furthermore, the dielectric constant ⁇ r is 40 or more and the Q value is 750 or more, so that desired good dielectric characteristics can be obtained, and the insulation resistance logIR after the PCT test is 10 or more, and reliability can be secured. I understood.
- the first sintering When the second sintering aid component is contained in an amount of 5 to 10% by weight in addition to the auxiliary agent component, the relative dielectric constant ⁇ r is further increased as compared with the case where the second sintering aid component is not contained. It was found that improvement could be achieved.
- Example 4 CaTiO 3 was used in place of SrTiO 3 , various samples were prepared, and the characteristics were evaluated.
- Example preparation B 2 O 3 , SiO 2 , Al 2 O 3 , and CaO are prepared as glass raw materials, and CaTiO 3 , CuO, CaCO 3 , MnCO 3 , CoO, and ZnO are prepared as additives (fillers) other than the glass raw materials. did.
- the glass raw material is weighed so that the content of the glass composition is the sample number G1 (within the scope of the present invention) of Table 1, and the total content of the ceramic composition is as shown in Table 7.
- the additive material was weighed. Note that the CaCO 3 and MnCO 3 were weighed so that the content shown in Table 7 in terms of CaO and MnO terms.
- Table 7 shows the component compositions of sample numbers 81-98.
- sample evaluation For each of the sample numbers 81 to 98, the sinterability was evaluated in the same manner as in [Example 1], and the shrinkage behavior was evaluated.
- Sample No. 81 has a low glass composition content of 20% by weight, and therefore, like Sample Nos. 21 to 23 (Tables 3 and 4), the flowability of the glass decreases during firing and the ceramic sintered body shrinks. The shrinkage rate became 98.18% and 99% or less. Moreover, firing at a low temperature of 870 ° C. became difficult, resulting in poor termination.
- sample numbers 82 to 95 have a glass composition content of 24 to 40% by weight, a CaTiO 3 content of 48 to 75.4% by weight, and a CuO content of 0.1 to 5.0% by weight.
- % And CaO content of 0.5 to 7.0% by weight are both within the scope of the present invention, so that the sinterability is good and the shrinkage ratio is 99% or more during firing. It was found that the shrinkage behavior of can also be suppressed.
- the dielectric constant ⁇ r is 40 or more and the Q value is 750 or more, so that desired good dielectric characteristics can be obtained, and the insulation resistance logIR after the PCT test is 10 or more, and reliability can be secured. I understood.
- the second sintering aid component is Although the relative permittivity ⁇ r tends to decrease slightly by the inclusion, it has been found that a desired high relative permittivity of 40 or more can be secured.
- Suppression of shrinkage behavior of ceramic sintered body during firing and high relative dielectric constant can be achieved at the same time, and it is suitable for low-temperature firing, and can be used for ceramic electronic parts such as ceramic multilayer substrates and LC parts.
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Abstract
Description
上述したガラス組成物をセラミック組成物中に含有させることにより、1050℃以下、特に900℃前後の低温での焼成が可能となるが、そのためにはガラス組成物の含有量は、少なくとも24重量%以上必要である。すなわち、ガラス組成物の含有量を24重量%未満に低下させると、焼成時にガラスの流動性が低下することから、セラミック焼結体は収縮し易くなる。しかも、焼結性も低下し、低温で焼結させるのが困難になるおそれがある。
B2O3は、軟化温度を下げて粘性流動を促進するために添加されるが、ガラス組成物中のB2O3の含有量が4重量%未満の場合は、含有量が少なすぎ、このためガラス粘度が高くなって焼結不良を招くおそれがある。一方、ガラス組成物中のB2O3の含有量が17.5重量%を超えると、ガラス組成物の化学的安定性が劣化し、その結果、高温多湿下で長時間放置すると絶縁抵抗logIRが低下して信頼性を損なうおそれがある。
SiO2は、ガラス組成物の安定性に寄与するが、ガラス組成物中のSiO2の含有量が28重量%未満の場合は、化学的安定性の劣化を招き、その結果、高温多湿下で長時間放置すると絶縁抵抗が低下して信頼性を損なうおそれがある。一方、ガラス組成物中のSiO2の含有量が50重量%を超えると、含有量が過剰となってガラス粘度が高くなり、その結果、焼結不良を招くおそれがある。
Al2O3はガラス組成物を安定化させるために必要に応じて添加されるが、ガラス組成物中のAl2O3の含有量が20重量%を超えると、結晶化し難くなってQ値の低下を招くおそれがある。
MO(MはCa、Mg、Sr、及び/又はBa)は、B2O3と同様、軟化温度を下げて粘性流動を促進するために添加されるが、ガラス組成物中のMOの含有量が36重量%未満の場合は、含有量が少なすぎ、このためガラス粘度が高くなって焼結不良を招くおそれがある。一方、ガラス組成物中のMOの含有量が50重量%を超えると、ガラス組成物の化学的安定性が劣化し、その結果、高温多湿下で長時間放置すると絶縁抵抗logIRが低下し、信頼性を損なうおそれがある。
SrTiO3は、比誘電率εrが250であり、CaTiO3は、比誘電率εrが170であり、いずれも比誘電率εrが高いことから、ガラス組成物との配合量を調整することにより、焼成時におけるセラミック焼結体の収縮挙動を制御しつつ、比誘電率εrを高めることが可能となる。
ガラス組成物は、それ自体が液相を生成して粒子同士の焼結を進める焼結助剤としての作用を有するが、比誘電率εrが低いことから含有量が多くなると、比誘電率εrの高いSrTiO3又はCaTiO3を添加しても、所望の高比誘電率を有するセラミック組成物を得るのが困難となる。
前記第1の焼結助剤成分に加え、第2の焼結助剤成分としてMn、Co、Znの中から選択された少なくとも1種を含む金属酸化物を添加することによっても、比誘電率εrを更に向上させることが可能である。
〔白基板の作製〕
まず、ガラス素原料として、CaO、BaO、SrO、MgO、Al2O3、SiO2、及びB2O3を用意した。そして、ガラス組成物が表1に示すような含有量となるように、前記ガラス素原料を秤量した。
まず、Agを主成分とするAgペーストを用意した。そして、上述したセラミックグリーンシ-トの表面にAgペーストをスクリーン印刷し、導体パターンを形成した。次いで、静電容量が取得可能となるように導体パターンの形成されたセラミックグリーンシートを積層し、さらに導体パターンの形成されていないセラミックグリーンシートで狭持してセラミック積層体を作製した。そして、セラミック積層体の両面に拘束層を配して圧着体を作製した。
試料番号1~19の各試料(白基板)について、焼結性及び焼成時の収縮挙動を評価した。
×100 ・・・(1)
横方向収縮率=(焼結後の横方向の長さ/焼結前の横方向の長さ)
×100 ・・・(2)
収縮率=(縦方向収縮率+横方向収縮率)/2 ・・・(3)
また、共振周波数6GHzで比誘電率εr及びQ値を測定した。尚、比誘電率εrは40以上、Q値は750以上を良品と判断した。
ガラス素原料としてB2O3、SiO2、Al2O3、CaOを用意し、ガラス素原料以外の添加物(フィラー)としてSrTiO3、CuO、及びCaCO3を用意した。
試料番号21~53の各試料について、〔実施例1〕と同様の方法で焼結性を評価し、収縮挙動を評価した。
ガラス素原料としてB2O3、SiO2、Al2O3、CaOを用意し、ガラス素原料以外の添加物(フィラー)としてSrTiO3、CuO、CaCO3、MnCO3、CoO、及びZnOを用意した。
試料番号61~75の各試料について、〔実施例1〕と同様の方法で焼結性を評価し、収縮挙動を評価した。
ガラス素原料としてB2O3、SiO2、Al2O3、CaOを用意し、ガラス素原料以外の添加物(フィラー)としてCaTiO3、CuO、CaCO3、MnCO3、CoO、及びZnOを用意した。
試料番号81~98の各試料について、〔実施例1〕と同様の方法で焼結性を評価し、収縮挙動を評価した。
2 セラミック焼結体
5a~5m セラミックグリーンシート
7a~7c 導体パターン
8a~8d 導体パターン
11 第1のセラミック層群(第1のセラミック層)
12a、12b 第2のセラミック層群(第2のセラミック層)
13 内部電極(導体パターン)
14 内部電極(導体パターン)
15 内部配線(導体パターン)
16 内部配線(導体パターン)
Claims (7)
- B2O3-SiO2-Al2O3-MO系ガラス組成物(ただし、MはCa、Mg、Sr、及びBaの中から選択された少なくとも1種を示し、B2O3:4~17.5重量%、SiO2:28~50重量%、Al2O3:0~20重量%、MO:36~50重量%、である。)を24~40重量%含有すると共に、
SrTiO3及びCaTiO3のうちの少なくとも1種を46~75.4重量%含有し、
かつ、CuO換算で0.1~5.0重量%のCu酸化物と、CaO換算で0.5~7.0重量%のCa酸化物とを含み、
Mn、Zn、Coの中から選択された少なくとも1種を含む金属酸化物がそれぞれ、MnO換算、ZnO換算、CoO換算で10重量%以下(ただし、0重量%を含む。)であることを特徴とするセラミック組成物。 - 請求項1記載のセラミック組成物がシート状に成形されていることを特徴とするセラミックグリーンシート。
- 請求項1記載のセラミック組成物の焼結体からなる第1のセラミック層を有していることを特徴とするセラミック電子部品。
- 前記第1のセラミック層と、該第1のセラミック層よりも比誘電率の低い第2のセラミック層とが積層されていることを特徴とする請求項3記載のセラミック電子部品。
- 前記第2のセラミック層は、セラミック粉末を51~60重量%含有し、かつ、B2O3-SiO2-Al2O3-MO系ガラス組成物(ただし、MはCa、Mg、Sr、及びBaの中から選択された少なくとも1種を示し、B2O3:5~17.5重量%、SiO2:28~44重量%、Al2O3:0~20重量%、MO:36~50重量%である。)を40~49重量%含有したセラミック組成物の焼結体であることを特徴とする請求項4記載のセラミック電子部品。
- 前記セラミック粉末はAl2O3であることを特徴とする請求項5記載のセラミック電子部品。
- Ag又はCuを主成分とする導体パターンを有していることを特徴とする請求項3乃至請求項6のいずれかに記載のセラミック電子部品。
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