WO2012053316A1 - 積層セラミックコンデンサ - Google Patents
積層セラミックコンデンサ Download PDFInfo
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- WO2012053316A1 WO2012053316A1 PCT/JP2011/071787 JP2011071787W WO2012053316A1 WO 2012053316 A1 WO2012053316 A1 WO 2012053316A1 JP 2011071787 W JP2011071787 W JP 2011071787W WO 2012053316 A1 WO2012053316 A1 WO 2012053316A1
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- Prior art keywords
- dielectric
- ceramic
- dielectric ceramic
- batio
- composition
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- 239000003985 ceramic capacitor Substances 0.000 title claims description 42
- 239000000919 ceramic Substances 0.000 claims abstract description 119
- 239000000203 mixture Substances 0.000 claims abstract description 72
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 12
- 229910052692 Dysprosium Inorganic materials 0.000 claims abstract description 11
- 229910052691 Erbium Inorganic materials 0.000 claims abstract description 11
- 229910052693 Europium Inorganic materials 0.000 claims abstract description 11
- 229910052688 Gadolinium Inorganic materials 0.000 claims abstract description 11
- 229910052689 Holmium Inorganic materials 0.000 claims abstract description 11
- 229910052769 Ytterbium Inorganic materials 0.000 claims abstract description 11
- 238000010304 firing Methods 0.000 claims description 24
- 239000012298 atmosphere Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 19
- 150000001875 compounds Chemical class 0.000 claims description 15
- 229910052750 molybdenum Inorganic materials 0.000 claims description 15
- 238000007639 printing Methods 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 15
- 238000005520 cutting process Methods 0.000 claims description 14
- 229910052720 vanadium Inorganic materials 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 13
- 229910052791 calcium Inorganic materials 0.000 claims description 12
- 229910052712 strontium Inorganic materials 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 238000005245 sintering Methods 0.000 claims description 11
- 229910052796 boron Inorganic materials 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 9
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 6
- 238000010030 laminating Methods 0.000 claims description 6
- 229910052744 lithium Inorganic materials 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 229910052702 rhenium Inorganic materials 0.000 claims description 4
- 229910052573 porcelain Inorganic materials 0.000 claims description 3
- 238000007652 sheet-forming process Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 12
- 239000002184 metal Substances 0.000 abstract description 12
- 229910002113 barium titanate Inorganic materials 0.000 abstract 3
- 239000010949 copper Substances 0.000 description 53
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 15
- 238000009413 insulation Methods 0.000 description 10
- 229910052797 bismuth Inorganic materials 0.000 description 7
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 7
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- 229910052759 nickel Inorganic materials 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000009766 low-temperature sintering Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
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- 239000002002 slurry Substances 0.000 description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
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- 239000003960 organic solvent Substances 0.000 description 2
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910052765 Lutetium Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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- 238000011109 contamination Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
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- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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- 229910052761 rare earth metal Inorganic materials 0.000 description 1
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- 239000010935 stainless steel Substances 0.000 description 1
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- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- B32—LAYERED PRODUCTS
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Definitions
- the present invention is capable of low-temperature sintering at 1030 ° C. or lower without containing lead or bismuth that is harmful to the environment or the human body in the composition, and is a highly conductive metal mainly composed of Cu. It can be co-sintered, exhibits high dielectric constant and dielectric characteristics satisfying X7R and X5R characteristics, and has high insulation resistance and excellent life characteristics such as high temperature load even when fired in a reducing atmosphere.
- the present invention relates to a dielectric ceramic composition, an electronic component such as a multilayer ceramic capacitor using the dielectric ceramic composition, and a manufacturing method thereof.
- the melting point of copper is 1085 ° C., which is lower than that of nickel, when copper is used as the internal electrode, it is necessary to fire at 1030 ° C., preferably 1000 ° C. or less, which is lower than conventional. Therefore, a dielectric material for a multilayer ceramic capacitor that can exhibit sufficient characteristics even when fired at is required.
- the following inventions are known as dielectric ceramic compositions satisfying such requirements, and these inventions show that copper is used as an internal electrode for a multilayer ceramic capacitor. *
- Patent Document 1 the composition formula: 100 (Ba 1-x Ca x) m TiO 3 + aMnO + bV 2 O 5 + cSiO 2 + dRe 2 O 3 (where, Re is Y, La, Sm, Eu, Gd, Tb, A dielectric ceramic composition represented by: at least one metal element selected from Dy, Ho, Er, Tm, and Yb, wherein a, b, c, and d represent a molar ratio).
- a dielectric ceramic composition in the range of 0.050 ⁇ d ⁇ 2.5 is shown.
- This dielectric ceramic composition is “a dielectric ceramic layer having a relative dielectric constant of 3000 or more.
- the absolute value of the DC bias change rate when voltage is applied is as small as 20% or less, and the temperature characteristic of the relative dielectric constant is the X7R characteristic of EIA standard (range from -55 ° C to 125 ° C with reference to the relative dielectric constant at 25 ° C The absolute value of the relative permittivity temperature change rate is within 15%), the insulation resistance is as high as 10 ⁇ 11 ⁇ ⁇ m or more at 25 ° C., and the high-temperature load reliability is high
- a dielectric ceramic composition having an average failure life as high as 100 h or more when a DC voltage having an electric field strength of 10 V / ⁇ m is applied at 150 ° C.
- composition formula of the main component is expressed as ⁇ (Sr X Ca Y Ba 1-XY ) (Ti 1-W M W ) O 3 + (1- ⁇ ) ((Bi 1-Z n * A Z ) 2 O 3 + ⁇ TiO 2 ), where M is at least one selected from Zr and Mg, and A is at least one selected from Li, K, and Na.
- the dielectric ceramic composition is “in the case of obtaining a reduction-resistant dielectric ceramic composition corresponding to a base metal electrode such as a Cu electrode, A reduction-resistant dielectric ceramic composition capable of improving the dielectric constant without containing lead harmful to the border and the human body and reducing the temperature change rate of the dielectric constant ”(paragraph [0009]) “With no lead in the composition, the dielectric constant is as high as 1000 or more, and the temperature change rate of the dielectric constant is within ⁇ 10% between -25 ° C. and + 85 ° C. It is possible to obtain a reduction-resistant dielectric ceramic composition having excellent characteristics and having a CR product obtained by multiplying the value of capacitance and insulation resistance of 1000 M ⁇ F or more, which is excellent in insulation even after reduction firing. ” (Paragraph [0013]). However, the reduction-resistant dielectric ceramic composition of Patent Document 2 uses bismuth, which is a heavy metal, instead of lead, and has not yet been considered for a bismuth-free reduction-resistant dielectric ceramic composition.
- Re is a rare earth element
- a BaO—TiO 2 —ReO 3 / 2- based ceramic composition 10 to 25 wt% SiO 2 , 10 to 40 wt% B 2 O 3 , 25 to 55 wt% of MgO, 0 ⁇ 20 wt% of ZnO, 0 ⁇ 15 wt% of Al 2 O 3 0, ⁇ 0.5 ⁇ 10 wt% of Li 2 O, and 0 to 10 wt% of RO (where, R is a dielectric ceramic composition characterized by comprising a glass composition containing at least one of Ba, Sr, and Ca.
- the dielectric ceramic composition obtained has a relative dielectric constant of 50 or less, and is not suitable as a dielectric material for a small-sized and large-capacity multilayer ceramic capacitor.
- the present inventor can perform sintering at 1080 ° C. or lower in a reducing atmosphere, and does not contain lead (Pb) or bismuth (Bi) in the material of the dielectric ceramic layer.
- Pb lead
- Bi bismuth
- BaTiO 3 In the dielectric porcelain composition comprising a main component as a main component, conditions for the Ba / Ti ratio, the composition ratio of rare earths as subcomponents, and the composition ratio of MnO were found.
- the dielectric ceramic layer is ABO 3 + aRe 2 O 3 + bMnO (where ABO 3 is a perovskite mainly composed of BaTiO 3).
- Re 2 O 3 is one or more metal oxides selected from La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y, a , B represents the number of moles relative to 100 mol of ABO 3 ), the range is 1.000 ⁇ A / B ⁇ 1.035, and 0.05 ⁇ a ⁇ 0.
- the inventor of the present invention has a multilayer ceramic condancer in which the internal electrode is made of Cu or a Cu alloy, and the dielectric ceramic is composed of grains and grain boundaries having an average diameter of 400 nm or less when viewed in cross section.
- Patent Document 5 a temperature characteristic of X7R characteristic or X8R characteristic can be obtained.
- a starting material of the sintered body a mixture of MnO, rare earth oxide as an additive, and B 2 O 3 , Li 2 O, and SiO 2 as a sintering aid is used. .
- the present inventors have found that a multilayer ceramic capacitor using the dielectric ceramic composition is used. It was found that there is room for improvement. That is, the object of the present invention is to solve the above-mentioned problems that have not been sufficiently studied in the prior art, and a dielectric ceramic composition mainly composed of a BaTiO 3 compound is used in the composition. Even if it does not contain lead or bismuth harmful to the environment or the human body, it can be sintered at a low temperature of 1030 ° C.
- Cu has a high dielectric constant and X7R characteristics (based on the relative dielectric constant at 25 ° C., the absolute value of the temperature change rate of the relative dielectric constant within the range of ⁇ 55 ° C. to 125 ° C. is 15%. And dielectric properties satisfying the X5R characteristics (the absolute value of the temperature change rate of the relative permittivity within the range of ⁇ 55 ° C. to 85 ° C. within the range of ⁇ 55 ° C. to 85 ° C.
- Another object of the present invention is to provide a dielectric ceramic composition having excellent life characteristics such as a high temperature load, a multilayer ceramic capacitor using the dielectric ceramic composition, and a method for producing the same.
- the present inventor in a dielectric ceramic composition mainly composed of a BaTiO 3 -based compound, in addition to the contents of Re, Mn, B, Li, V and Mo It has been found that the total content of has an effect on the life characteristics of the multilayer ceramic capacitor using the internal electrode mainly composed of Cu. It has also been found that the amount of Cu diffusing from the internal electrode containing Cu as the main component into the dielectric layer affects the life characteristics of the multilayer ceramic capacitor. Furthermore, it has been found that it is important to suppress the content of conventionally contained Si, including those contained as impurities, from the viewpoint of low-temperature sintering.
- a main component composed of BaTiO 3 , Re In the dielectric ceramic composition comprising subcomponents consisting of Mn, V, Mo, Cu, B, Li, Ca, Sr, the dielectric ceramic composition is BaTiO 3 + aRe 2 O 3 + bMnO + cMo 2 O 5 + dMoO 3 + eCuO + fB 2 O 3 + gLi 2 O + xSrO + yCaO (where Re is at least one selected from Eu, Gd, Dy, Ho, Er, Yb and Y, ag, x and y are the number of moles relative to 100 mol of the main component consisting of BaTiO 3.
- the dielectric ceramic layer is any one of the items [1] to [4] A multilayer ceramic capacitor, wherein the internal electrode is made of Cu or a Cu alloy.
- the multilayer ceramic capacitor includes a plurality of dielectric ceramic layers, internal electrodes formed so as to be opposed to the dielectric ceramic layers, and alternately drawn to different end faces, and the dielectric ceramics
- the multilayer ceramic capacitor of [5] further comprising external electrodes formed on both end faces of the layer and electrically connected to each of the internal electrodes.
- a main component material composed of a BaTiO 3 -based compound has at least Re as a subcomponent material (where Re is one or more selected from Eu, Gd, Dy, Ho, Er, Yb, and Y), Mn Preparing a ceramic raw material containing, in addition, one or more of V, Mo, V, and Mo, or Cu, Ba, Sr, and Ca in the form of oxide, glass, other compounds,
- a sheet forming step for forming a ceramic green sheet using the ceramic raw material, a printing step for printing an internal electrode pattern mainly composed of Cu on the ceramic green sheet, and a ceramic green sheet that has undergone the printing step are laminated.
- Laminating step for forming a laminated body a cutting step for cutting the laminated body for each internal electrode pattern to obtain a chip-like laminated body, and a chip obtained by the cutting step
- the external electrode so as to be electrically connected to the internal electrodes at both ends of the sintered body by firing the laminated body in a reducing atmosphere at a temperature of 1030 ° C. or less to obtain a sintered body
- a ceramic raw material containing, in addition, one or more of V, Mo, V, and Mo, or Cu, Ba, Sr, and Ca in the form of oxide, glass, other compounds,
- a sheet forming step for forming a ceramic green sheet using the ceramic raw material, a printing step for printing an internal electrode pattern mainly composed of Cu on the ceramic green sheet, and a ceramic green sheet that has undergone the printing step are laminated.
- An external electrode forming step of applying a conductive paste for an external electrode so as to be electrically connected to the internal electrodes at both ends of the laminated laminate, and a chip-like laminated body obtained in the external electrode forming step 1030 The method for producing a multilayer ceramic capacitor according to the above [5] or [6], comprising a firing step of firing in a reducing atmosphere at a temperature of 0 ° C. or lower.
- the dielectric ceramic composition can be sintered at a low temperature of 1030 ° C. or less without containing lead or bismuth which is harmful to the environment or the human body, and is made conductive with Cu as a main component. Co-sintering with an excellent metal is possible, and by using Cu as an internal electrode, it exhibits a high dielectric constant and dielectric characteristics satisfying X7R characteristics (or X5R characteristics), and even when fired in a reducing atmosphere.
- a dielectric ceramic composition and a multilayer ceramic capacitor having high insulation resistance and excellent life characteristics such as high temperature load can be obtained.
- FIG. 1 is a diagram schematically showing an embodiment of a multilayer ceramic capacitor using the dielectric ceramic composition of the present invention as a dielectric layer.
- a multilayer ceramic capacitor 1 of the present invention has a configuration in which dielectric layers 2 made of a sintered ceramic body and internal electrodes 3 mainly composed of Cu are alternately stacked and the multilayer ceramic capacitor 1 is laminated.
- a pair of external electrodes 4 are formed which are respectively electrically connected to the internal electrodes 3 arranged alternately in the dielectric layer 2.
- the shape of the multilayer ceramic capacitor 1 is not particularly limited, but is usually a rectangular parallelepiped shape.
- the dielectric ceramic composition used for the dielectric layer 2 of the present invention comprises a main component composed of BaTiO 3 and subcomponents composed of Re, Mn, V, Mo, Cu, B, and Li.
- the dielectric ceramic composition of the dielectric layer 2 of the present invention is BaTiO 3 + aRe 2 O 3 + bMnO + cV 2 O 5 + dMoO 3 + eCuO + fB 2 O 3 + gLi 2 O + xSrO + yCaO (where Re is Eu, Gd, Dy, Ho, One or more selected from Er, Yb, and Y, ag, x, and y represent the number of moles relative to 100 mol of the main component consisting of BaTiO 3 ), and are contained in the dielectric magnetic composition (Ba + Sr + Ca ) / Ti when the molar ratio is m, 0.10 ⁇ a ⁇ 0.50, more preferably 0.20 ⁇ a ⁇ 0.35, 0.20
- the amount of Re 2 O 3 that is, a is small, particularly when it is less than 0.10, the life is remarkably reduced.
- the sinterability is deteriorated, particularly less than 0.50.
- the range of 0.10 ⁇ a ⁇ 0.50 is desirable. More desirably, 0.20 ⁇ a ⁇ 0.35, which enables high life characteristics and densification at 1000 ° C. or lower.
- the life is shortened.
- the sinterability is lowered, and when it is more than 0.80, sintering at 1030 ° C. or less becomes difficult. Therefore, the range of 0.20 ⁇ b ⁇ 0.80 is desirable. More desirably, 0.20 ⁇ b ⁇ 0.60, which enables high life characteristics and densification at 1000 ° C. or lower.
- V and Mo are not contained as a subcomponent, the life characteristics are deteriorated. Therefore, c + d ⁇ 0.04 is desired.
- the range of 0.04 ⁇ c + d ⁇ 0.12 is desirable.
- the life characteristics were also deteriorated. Therefore, 0 ⁇ c ⁇ 0.12 and 0 ⁇ d ⁇ 0.07 A range of is desirable. In particular, when the range is 0 ⁇ c ⁇ 0.10, even better life characteristics are exhibited. *
- Cu When Cu is used for the internal electrode, it is known that Cu diffuses from the internal electrode to the dielectric layer. Therefore, it is considered that Cu is contained in the dielectric layer without adding Cu, and the life characteristics are improved by including Cu. At this time, when CuO is not added, it is considered that the diffusion of Cu from the internal electrode to the dielectric layer reaches an equilibrium state and is stabilized. However, when Cu was added from the outside and excessive Cu was present, there was a tendency that the life decreased. Therefore, 0 ⁇ e ⁇ 1.00 is desirable. Further, Cu can be contained in the dielectric layer by adding Cu as a raw material in the raw material process or by diffusing Cu from the Cu internal electrode into the dielectric layer in the firing process. *
- the range of 0.50 ⁇ f ⁇ 2.00 is desirable. Further, in order to perform firing at a lower temperature, the range of 0.65 ⁇ f ⁇ 1.5 is desired, which enables high life characteristics and densification at 1000 ° C. or lower.
- the amount of Li 2 O that is, g, when (100 (m ⁇ 1) +2 g) / 2f is less than 0.6, the life is reduced, and conversely, when it is greater than 1.3, the sinterability is increased. It becomes low and densification at 1030 ° C. or less becomes difficult. Therefore, the range of 0.6 ⁇ (100 (m ⁇ 1) +2 g) /2f ⁇ 1.3 is desirable. Further, when m ⁇ 1, it is desirable that m> 1 since the life characteristics are deteriorated. However, the value of m is not uniquely determined by the synthesis of the BaTiO 3 -based compound.
- an oxide or carbide of Ba, Sr, or Ca is added in the raw material process.
- the same effect can be obtained.
- 100 (m-1) / 2g is less than 0.50, the life characteristics are deteriorated.
- it is larger than 5.1 the sinterability is lowered and sintering at 1030 ° C. or less becomes difficult. Therefore, the range of 0.50 ⁇ 100 (m ⁇ 1) /2h ⁇ 5.1 is desirable.
- Sr and Ca can be used as an adjustment element for m as in the case of Ba. In the present invention, it has been confirmed that m is effective in the range of 0 ⁇ x ⁇ 1.5 and 0 ⁇ y ⁇ 1.5.
- Si is desirably not included for low-temperature sintering, but is highly likely to be contained in a manufacturing process such as a dispersion process. Therefore, in the present invention, when SiO 2 is intentionally added and the stability of the system with respect to the Si content is confirmed, it is 1.0 mol% in terms of SiO 2. It was confirmed that there was no significant effect on the characteristics if the following. On the other hand, if the content is more than 1.0 mol%, the sinterability is significantly lowered, so that the impurity content of SiO 2 needs to be 1.0 mol% or less.
- the dielectric porcelain composition used for the dielectric layer 2 even if the composition does not contain lead, bismuth or the like harmful to the environment or human body, it is 1030 ° C. or less. Desirably, it can be sintered at a low temperature of 1000 ° C. or lower, can be co-sintered with a metal having Cu as a main component, and has a high dielectric constant and satisfies X7R characteristics and X5R characteristics. It is possible to propose a dielectric ceramic composition and a multilayer ceramic capacitor that exhibit characteristics, have high insulation resistance even when fired in a neutral or reducing atmosphere, and have excellent life characteristics such as high-temperature load.
- the manufacturing method of the multilayer ceramic capacitor according to the present invention includes: (1) a main component material made of a BaTiO 3 -based compound and at least Re as a subcomponent material (where Re is Eu, Gd, Dy, Ho, Er, Yb And one or more selected from Y and Y), Mn, B, Si and Li, and further one or more of V and Mo, or further Cu, Ba, Sr and Ca, oxide, glass and other compounds.
- a raw material process for preparing a ceramic raw material in a form such as (2) a sheet forming process for forming a ceramic green sheet using the ceramic raw material, and an internal electrode pattern mainly composed of Cu printed on the ceramic green sheet
- a conductive paste for external electrodes is applied to both ends of the sintered body so as to be electrically connected to the both ends of the sintered body, and a baking process is performed.
- An external electrode forming step Further, in the external electrode forming step (7), after applying the external electrode conductive paste so as to be electrically connected to the internal electrodes at both ends of the chip-like laminate obtained in the cutting step, By firing in a reducing atmosphere at a temperature of 1030 ° C. or lower, preferably 1000 ° C. or lower, the external electrode forming step and the baking step can be performed simultaneously.
- Example 1 as a starting material, BaTiO 3, Re 2 O 3 , MnO 2, B 2 O 3, SiO 2 and Li 2 CO 3, V 2 O 5, MoO 3, CuO and BaCO 3, SrCO 3, CaCO 3 was prepared.
- the ceramic raw material for these main components and subcomponents may be any material that can be changed into an oxide by heat treatment, and may not be a carbonate or oxide.
- the obtained dielectric powder was granulated using polyvinyl alcohol or the like, and then uniaxially molded in a predetermined mold, and N containing water vapor. 2 : 98% -H 2 : 2%
- a ceramic fired body was obtained by holding at 1030 ° C. for 2 hours in a gas atmosphere.
- the obtained ceramic fired body was measured for its open porosity according to JIS-R1634, and the one with an open porosity of 1% or less was designated as sinterability ⁇ , and the open porosity exceeded 1%. Is shown in Table 2 (1) and (2) below. Further, the same examination was performed by changing the firing temperature to 1000 ° C., and even when the firing temperature was 1000 ° C., the open porosity was 1% or less, and indicated by “ ⁇ ”.
- a plurality of ceramic green sheets on which conductive patterns were formed were laminated in a predetermined direction.
- the upper and lower ceramic green sheets adjacent to each other were arranged so that the printing surface thereof was shifted by about half in the longitudinal direction of the internal electrode pattern.
- a ceramic green sheet for a protective layer on which the internal electrode pattern was not printed was laminated on both the upper and lower surfaces of this laminate and pressed. Then, it cuts out to a predetermined shape and produces a ceramic laminated body. Then, after debinding at 300 to 600 ° C.
- a predetermined firing temperature in a N 2 : 98% -H 2 : 2% gas atmosphere containing water vapor was increased at a rate of 300 ° C./hr until (960 to 1020 ° C.). After reaching the firing temperature, it is held for 2 hours, then the temperature is lowered at a rate of 300 ° C./hr, the atmosphere is changed to a nitrogen atmosphere at about 700 ° C. and held for 2 hours, and then lowered to room temperature.
- a laminated ceramic sintered body with embedded therein was obtained.
- this multilayer ceramic sintered body is barrel-polished to expose the internal electrode 3 from the end face of the sintered body, and thereafter, external electrode paste is applied to both ends and dried, and then predetermined in an N 2 gas atmosphere.
- the external electrode 4 was formed by baking at a temperature of 700 to 900 ° C.
- the external electrode paste used was prepared by kneading together metal fine particles mainly composed of Cu, an organic vehicle, a small amount of frit, etc., but is not limited to this, and Ni, Ag, etc. It can also be used as an external electrode.
- the obtained multilayer ceramic capacitor was measured for capacitance C and tan ⁇ values under the conditions of frequency 1 kHz, effective voltage AC 1 Vrms, temperature 25 ° C. using an automatic bridge type measuring device, and the ratio was calculated from capacitance C and sample dimensions. The dielectric constant was calculated.
- the capacitance measurement was performed in the temperature range of ⁇ 55 ° C. to 150 ° C., and the products falling into EIA standard X7R or X5R were judged as non-defective products, and the others were marked as “X”.
- the insulation resistance IR
- an insulation resistance meter was used, and a resistance value measured after applying a DC voltage of 50 V at 25 ° C.
- HALT accelerated life test
- the voltage applied to the dielectric layer between the internal electrodes laminated on the sample placed in the thermostat heated to 150 ° C. was set to 20 V / ⁇ m in terms of electric field strength.
- those having an average accelerated life until dielectric breakdown of 500 hr or more were marked with ⁇ , those with 100 hr or more being ⁇ , and those with less than that for x.
- Table 2 shows the characteristics of the obtained multilayer ceramic capacitor. *
- Example 2 A dielectric powder was prepared using the same method as in Example 1 so as to have the composition shown in Table 3, and the sinterability was confirmed. *
- a PVB binder or an acrylic binder, a plasticizer, and an organic solvent as a solvent are appropriately added to prepare a ceramic slurry, and then this ceramic slurry is used with a reverse roll coater or the like. Then, a green sheet having a thickness of 7 ⁇ m was processed on the polyester film. Thereafter, it was cut to a predetermined size to obtain a rectangular ceramic green sheet. An internal electrode paste mainly composed of Cu was printed on the obtained rectangular ceramic green sheet using a screen printing method or the like to form a conductive pattern. Next, a plurality of ceramic green sheets on which conductive patterns were formed were laminated in a predetermined direction.
- the upper and lower ceramic green sheets adjacent to each other were arranged so that the printing surface thereof was shifted by about half in the longitudinal direction of the internal electrode pattern. Furthermore, a ceramic green sheet for a protective layer on which the internal electrode pattern was not printed was laminated on both the upper and lower surfaces of this laminate and pressed. Then, it cuts out to a predetermined shape and produces a ceramic laminated body. Next, an external electrode paste is applied in advance to the end face of the cut ceramic laminate where the internal electrode 3 is exposed and dried, and then 300 to 600 in an inert atmosphere (so that Cu is not oxidized).
- the binder is removed at a temperature of 300 ° C./hr until a predetermined firing temperature (940 to 1030 ° C.) is reached in a gas atmosphere containing N 2 : 98% -H 2 : 2% containing water vapor. After reaching the firing temperature, hold it for 2 hours, then lower the temperature at a rate of 300 ° C./hr, change the atmosphere to a nitrogen atmosphere at about 700 ° C., hold it for 2 hours, and then reach room temperature By cooling, the laminated ceramic was sintered and the external electrode 4 was simultaneously formed.
- the obtained multilayer ceramic capacitor was evaluated in the same manner as in Example 1, and the results are shown in Table 4. As shown in Table 4, it is possible to obtain predetermined characteristics even when the external electrode is performed simultaneously with the sintering of the dielectric layer.
- a dielectric ceramic composed of a main component composed of BaTiO 3 and subcomponents composed of Re, Mn, V, Mo, Cu, B, Li, Sr, and Ca constituting the dielectric layer in the multilayer ceramic capacitor.
- the content of the components constituting the composition is specified as described above, so that the composition can be baked at a low temperature of 1080 ° C. or less even if the composition does not contain lead or bismuth harmful to the environment or the human body. It can be sintered, and can be co-sintered with a metal having Cu as a main component and excellent in electrical conductivity.
- Cu as an internal electrode, high dielectric constant and X7R characteristics (or X5R characteristics) are satisfied. It can be seen that it is possible to obtain a multilayer ceramic capacitor exhibiting dielectric characteristics and having high insulation resistance and excellent life characteristics such as a high temperature load even when fired in a reducing atmosphere.
- Multilayer ceramic capacitor 2 Dielectric layer 3: Internal electrode 4: External electrode
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Abstract
Description
Mn、V、Mo、Cu、B、Li、Ca、Srからなる副成分とからなる誘電体磁器組成物において、 前記誘電体磁器組成を、BaTiO3+aRe2O3+bMnO+cV2O5+dMoO3+eCuO+fB2O3+gLi2O+xSrO+yCaO(ただし、ReはEu、Gd、Dy、Ho、Er、Yb、及びYから選ばれる1種以上、a~g、xおよびyはBaTiO3からなる主成分100molに対するmol数を示す。)で表記し、該誘電体磁気組成物に含まれる(Ba+Sr+Ca)/Tiのmol比をmとしたとき、 0.10≦a≦0.50 0.20≦b≦0.80 0≦c≦0.12 0≦d≦0.07 0.04≦c+d≦0.12 0≦e≦1.00 0.50≦f≦2.00 0.6≦(100(m-1)+2g)/2f≦1.3 0.5≦100(m-1)/2g≦5.1 0≦x≦1.5 0≦y≦1.5であることを特徴とする誘電体磁器組成物。[2]不純物として含まれるSiは、BaTiO3からなる主成分を100molとしたときにSiO2換算で1.0mol以下であることを特徴とする前記[1]の誘電体磁器組成物。[3]前記誘電体磁器組成を、(Ba1-v-wSrvCaw)TiO3+aRe2O3+bMnO+cV2O5+dMoO3+eCuO+fB2O3+gLi2O+xSrO+yCaOで表記したとき、 0≦x+v×100≦1.5 0≦y+w×100≦1.5としたことを特徴とする前記[1]~[2]のいずれかの誘電体磁器組成物。[4]焼結温度が1030℃以下で緻密化させることが可能であることを特徴とする前記[1]~[3]のいずれかの誘電体磁器組成物。[5]複数の誘電体セラミック層と、該誘電体セラミック層間に対向して形成された内部電極を有する積層セラミックコンデンサにおいて、前記誘電体セラミック層が、前記[1]~[4]のいずれかの誘電体磁器組成物で構成された焼結体であり、前記内部電極は、CuまたはCu合金で構成されていることを特徴とする積層セラミックコンデンサ。[6]前記積層セラミックコンデンサが、複数の誘電体セラミック層と、該誘電体セラミック層間に対向して形成され、交互に異なる端面へ引出されるように形成された内部電極と、前記誘電体セラミック層の両端面に形成され、前記内部電極のそれぞれに電気的に接続された外部電極とを有することを特徴とする前記[5]の積層セラミックコンデンサ。[7]BaTiO3系化合物からなる主成分原料に、副成分原料として少なくともRe(ここで、Reは、Eu、Gd、Dy、Ho、Er、Yb、及びYから選ばれる1種以上)、Mn、B、およびLiと、更にV、Moのうち1種以上と、或いは更にCuやBa、Sr、Caを、酸化物やガラス、その他の化合物などの形態で含むセラミック原料を準備する工程と、該セラミック原料を用いてセラミックグリーンシートを形成するシート形成工程と、該セラミックグリーンシートにCuを主成分とする内部電極パターンを印刷する印刷工程と、該印刷工程を経たセラミックグリーンシートを積層して積層体を形成する積層工程と、該積層体を内部電極パターン毎に裁断してチップ状の積層体を得る裁断工程と、該裁断工程で得られたチップ状の積層体を1030℃以下の温度で還元性雰囲気にて焼成して焼結体を得る焼成工程と、該焼結体の両端部に該内部電極と電気的に接続するように外部電極用導電性ペーストを塗布して焼付け処理を施す外部電極形成工程を備えることを特徴とする前記[5]又は[6]の積層セラミックコンデンサの製造方法。[8]BaTiO3系化合物からなる主成分原料に、副成分原料として少なくともRe(ここで、Reは、Eu、Gd、Dy、Ho、Er、Yb、及びYから選ばれる1種以上)、Mn、B、およびLiと、更にV、Moのうち1種以上と、或いは更にCuやBa、Sr、Caを、酸化物やガラス、その他の化合物などの形態で含むセラミック原料を準備する工程と、該セラミック原料を用いてセラミックグリーンシートを形成するシート形成工程と、該セラミックグリーンシートにCuを主成分とする内部電極パターンを印刷する印刷工程と、該印刷工程を経たセラミックグリーンシートを積層して積層体を形成する積層工程と、該積層体を内部電極パターン毎に裁断してチップ状の積層体を得る裁断工程と、該裁断工程で得られたチップ状の積層体の両端部に該内部電極と電気的に接続するように外部電極用導電性ペーストを塗布する外部電極形成工程と、該外部電極形成工程で得られたチップ状の積層体を1030℃以下の温度で還元性雰囲気にて焼成する焼成工程を備えることを特徴とする上記[5]又は[6]の積層セラミックコンデンサの製造方法。
以下であれば特性上に大きな影響を与えないことを確認した。一方で、1.0mol%よりも多く含まれていると焼結性の低下が顕著になるために、SiO2の不純物含有量を1.0mol%以下にする必要がある。
、組成物を構成する成分の含有量等を前記の如く特定することで、組成物中に環境や人体に有害な鉛やビスマス等を含有しなくても、1080℃以下の低温焼結が可能で、Cuを主成分とする導電性に優れた金属との共焼結が可能であり、Cuを内部電極とすることで、高誘電率かつX7R特性(またはX5R特性)を満足する誘電特性を示すと共に、還元雰囲気下で焼成しても、絶縁抵抗が高く、さらに高温負荷などの寿命特性に優れた積層セラミックコンデンサを得ることができきることがわかる。
Claims (8)
- BaTiO3からなる主成分と、Re、Mn、V、Mo、Cu、B、Li、Ca、Srからなる副成分とからなる誘電体磁器組成物において、 前記誘電体磁器組成を、BaTiO3+aRe2O3+bMnO+cV2O5+dMoO3+eCuO+fB2O3+gLi2O+xSrO+yCaO((ただし、ReはEu、Gd、Dy、Ho、Er、Yb、及びYから選ばれる1種以上、a~g、xおよびyはBaTiO3からなる主成分100molに対するmol数を示す。)で表記し、該誘電体磁気組成物に含まれる(Ba+Sr+Ca)/Tiのmol比をmとしたとき、 0.10≦a≦0.50 0.20≦b≦0.80 0≦c≦0.12 0≦d≦0.07 0.04≦c+d≦0.12 0≦e≦1.00 0.50≦f≦2.00 0.6≦(100(m-1)+2g)/2f≦1.3 0.5≦100(m-1)/2g≦5.1 0≦x≦1.5 0≦y≦1.5であることを特徴とする誘電体磁器組成物。
- 不純物として含まれるSiは、BaTiO3からなる主成分を100molとしたときにSiO2換算で1.0mol以下であることを特徴とする請求項1に記載の誘電体磁器組成物。
- 前記誘電体磁器組成を、(Ba1-v-wSrvCaw)TiO3+aRe2O3+bMnO+cV2O5+dMoO3+eCuO+fB2O3+gLi2O+xSrO+yCaOで表記したとき、 0≦x+v×100≦1.5 0≦y+w×100≦1.5としたことを特徴とする請求項1~2のいずれか1項に記載の誘電体磁器組成物。
- 焼結温度が1030℃以下で緻密化させることが可能であることを特徴とする請求項1~3のいずれか1項に記載の誘電体磁器組成物。
- 複数の誘電体セラミック層と、該誘電体セラミック層間に対向して形成された内部電極を有する積層セラミックコンデンサにおいて、 前記誘電体セラミック層が、請求項1~4のいずれか1項に記載の誘電体磁器組成物で構成された焼結体であり、 前記内部電極は、CuまたはCu合金で構成されていることを特徴とする積層セラミックコンデンサ。
- 前記積層セラミックコンデンサが、複数の誘電体セラミック層と、該誘電体セラミック層間に対向して形成され、交互に異なる端面へ引出されるように形成された内部電極と、前記誘電体セラミック層の両端面に形成され、前記内部電極のそれぞれに電気的に接続された外部電極とを有することを特徴とする請求項5に記載の積層セラミックコンデンサ。
- BaTiO3系化合物からなる主成分原料に、副成分原料として少なくともRe(ここで、Reは、Eu、Gd、Dy、Ho、Er、Yb、及びYから選ばれる1種以上)、Mn、B、およびLiと、更にV、Moのうち1種以上と、或いは、更にCuやBa、Sr、Caを、酸化物やガラス、その他の化合物などの形態で含むセラミック原料を準備する工程と、該セラミック原料を用いてセラミックグリーンシートを形成するシート形成工程と、該セラミックグリーンシートにCuを主成分とする内部電極パターンを印刷する印刷工程と、該印刷工程を経たセラミックグリーンシートを積層して積層体を形成する積層工程と、該積層体を内部電極パターン毎に裁断してチップ状の積層体を得る裁断工程と、該裁断工程で得られたチップ状の積層体を1030℃以下の温度で還元性雰囲気にて焼成して焼結体を得る焼成工程と、該焼結体の両端部に該内部電極と電気的に接続するように外部電極用導電性ペーストを塗布して焼付け処理を施す外部電極形成工程を備えることを特徴とする請求項5又は6に記載の積層セラミックコンデンサの製造方法。
- BaTiO3系化合物からなる主成分原料に、副成分原料として少なくともRe(ここで、Reは、Eu、Gd、Dy、Ho、Er、Yb、及びYから選ばれる1種以上)、Mn、B、およびLiと、更にV、Moのうち1種以上と、或いは更にCuやBa、Sr、Caを、酸化物やガラス、その他の化合物などの形態で含むセラミック原料を準備する工程と、該セラミック原料を用いてセラミックグリーンシートを形成するシート形成工程と、該セラミックグリーンシートにCuを主成分とする内部電極パターンを印刷する印刷工程と、該印刷工程を経たセラミックグリーンシートを積層して積層体を形成する積層工程と、該積層体を内部電極パターン毎に裁断してチップ状の積層体を得る裁断工程と、該裁断工程で得られたチップ状の積層体の両端部に該内部電極と電気的に接続するように外部電極用導電性ペーストを塗布する外部電極形成工程と、該外部電極形成工程で得られたチップ状の積層体を1030℃以下の温度で還元性雰囲気にて焼成する焼成工程を備えることを特徴とする請求項5又は6に記載の積層セラミックコンデンサの製造方法。
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