WO2002051770A1 - Compositions a base de porcelaine dielectrique et pieces electroniques associees - Google Patents
Compositions a base de porcelaine dielectrique et pieces electroniques associees Download PDFInfo
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- WO2002051770A1 WO2002051770A1 PCT/JP2001/008888 JP0108888W WO02051770A1 WO 2002051770 A1 WO2002051770 A1 WO 2002051770A1 JP 0108888 W JP0108888 W JP 0108888W WO 02051770 A1 WO02051770 A1 WO 02051770A1
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Definitions
- the present invention relates to a dielectric ceramic composition having reduction resistance, and to an electronic component such as a multilayer ceramic capacitor using the dielectric ceramic composition.
- Multilayer ceramic capacitors as electronic components are widely used as small, large-capacity, high-reliability electronic components, and the number used in a single electronic device is large.
- the demands on multilayer ceramic capacitors for further miniaturization, large capacity, low cost, and high reliability have become more and more severe.
- a paste for an internal electrode layer and a paste for a dielectric layer are laminated by a sheet method, a printing method, or the like, and the internal electrode layer and the dielectric layer in the laminate are simultaneously fired. Manufactured.
- Pd or Pd alloy is generally used as the conductive material of the internal electrode layer.However, since Pd is expensive, a relatively inexpensive base metal such as Ni or Ni alloy is used. It has become to. If a base metal is used as the conductive material for the internal electrode layer, firing in air will oxidize the internal electrode layer, so simultaneous firing of the dielectric layer and the internal electrode layer must be performed in a reducing atmosphere. There is. However, firing in a reducing atmosphere reduces the dielectric layer and lowers the specific resistance. For this reason, non-reducing dielectric materials have been developed.
- a multilayer ceramic capacitor using a non-reducing dielectric material has a problem that IR (insulation resistance) is significantly degraded by application of an electric field, that is, the IR life is short and the reliability is low.
- capacitors must also have good temperature characteristics, and in particular applications, flat temperature characteristics under severe conditions are required.
- multilayer ceramic capacitors have been used in various electronic devices such as engine electronic control units (ECUs), crank angle sensors, and anti-lock brake system (ABS) modules installed in the engine room of vehicles. Is coming. Since these electronic devices are used to stably perform engine control, drive control, and brake control, the circuits must have good temperature stability.
- the temperature can drop to about -20 ° C or less in winter in cold regions, and can rise to about + 130 ° C or more in summer after the engine is started. is expected.
- the environment for electronic devices has become more severe because the number of wire harnesses connecting electronic devices and their controlled devices has been reduced, and electronic devices may be installed outside vehicles. Therefore, capacitors used in these electronic devices need to have flat temperature characteristics over a wide temperature range.
- the temperature compensation capacitor material excellent in temperature characteristics (S r, Ca) ( T i, Z r) 0 3 system, Ca (T i, Z r ) 0 3 system, Nd 2 0 3 - 2 T i 0 2 based, La 2 0 3 - 2 but T i 0 2 system and the like are generally known, since these compositions relative dielectric constant very low (generally 100 or less), a large capacitor capacitance It is virtually impossible to make. +
- a dielectric ceramic composition having a flat capacitance-temperature characteristics as a main component BaT i 0 3, Nb 2 0 5 -C 03 04, MgO- Y, rare earth elements (Dy, Ho, etc.), B i 2 O a - T i0 composition obtained by adding 2, etc. are known.
- the mechanism for flattening the capacitance-temperature characteristics is not always clear, -1 18431 proposes to flatten the capacitance-temperature characteristic by dissolving Mg or a rare earth element in the core-shell structure.
- the second sub-component represented by, V 2 Os, it is selected from Mo 0 3 and W0 3
- At least one of the third subcomponent containing one type and the fourth subcomponent containing the oxide of R1 (at least one selected from RU ⁇ Sc, Er, Tm, Yb, and Lu)
- the ratio of each subcomponent with respect to 100 mol of the main component is as follows: the first subcomponent: 0.1 to 3 mol, the second subcomponent: 2 to 10 mol, and the third subcomponent: 0.01 to 0.5.
- Mole, fourth subcomponent 0.5 to 7 moles (however, the number of moles of the fourth subcomponent is a ratio of R 1 alone).
- the present applicant has also proposed the following dielectric ceramic composition (Japanese Patent Application No. 2000-26862).
- the dielectric ceramic composition as set forth in this application specification the main component containing barium titanate, MgO, C aO-, first sub comprises at least one selected from BaO, 3 0 Oyobi 0 2 Oa a component, a second auxiliary component containing as a main component silicon oxide, a third subcomponent including V 2 0 5, MO0 3 and W0 3 least one selected from an oxide of R 1 (wherein, R 1 is S c, Er, T m, of at least one selected from Yb, and Lu) a fifth subcomponent including a fourth subcomponent including, a Ca Z r 0 3 or CaO + Zr_ ⁇ 2
- the ratio of each component with respect to 100 mol of the main component is as follows: the first subcomponent: 0.1 to 3 mol, the second subcomponent: 2 to 10 mol, the third subcomponent: 0.01 to 0.1. 5 moles
- the ratio of the first subcomponent such as MgO to 100 mol of the main component is 0.1 mol or more.
- the dielectric constant is certainly high, the X8R characteristic is satisfied, and firing in a reducing atmosphere is possible.
- the capacitance-temperature characteristic it is difficult for the capacitance-temperature characteristic to satisfy the X8R characteristic when the dielectric layer is further thinned, and The present inventors have found that the life of the insulation resistance tends to decrease.
- the capacitance-temperature characteristics there is a tendency that the rate of change in capacitance, especially on the high-temperature side, tends to increase, and it is desired to improve this.
- rare earth oxides those containing lanthanide series elements are expensive, and the search for inexpensive replacement elements that can obtain the same characteristics has been advanced.
- Another object of the present invention is to provide an electronic component such as a multilayer ceramic capacitor which can realize a small size and a large capacity by using such a dielectric porcelain composition, and which can cope with a thin layer and a small size.
- the dielectric ceramic composition according to the present invention is a dielectric ceramic composition according to the present invention.
- a first sub-component comprising an oxide of A E (where A E is at least one selected from M ;, Ca, Ba and Sr);
- a second subcomponent comprising an oxide of R, wherein R is at least one selected from Y, Dy, Ho and Er;
- 2nd subcomponent 1 mol ⁇ 2nd subcomponent is approximately 7 mol.
- the ratio of each subcomponent with respect to 100 mol of the main component is as follows: first subcomponent: 0.01 mol ⁇ first subcomponent: 0.1 mol, second subcomponent: 1 mol, second subcomponent.
- the component is ⁇ 6 mol.
- the ratio of the number of moles of the second subcomponent to the number of moles of the first subcomponent is less than 10 (second subcomponent / first subcomponent) ⁇ 500.
- the ratio of the sixth subcomponent to 100 moles of the main component is 0 mole ⁇ the sixth subcomponent ⁇ 5 moles is there.
- the composition further has a subcomponent, and a ratio of the third subcomponent to 100 mol of the main component is 2 mol ⁇ third subcomponent ⁇ 10 mol.
- 110 Oyobi 0 2 0 3 has to be al fourth subcomponent including at least one, the ratio of the fourth subcomponent with respect to 100 moles of said main component are the 0 mole ⁇ fourth subcomponent ⁇ 0.5 mol.
- V 2 0 5, Mo 0 3 and W0 3 further fifth subcomponent including at least one selected from a ratio of the fifth subcomponent with respect to 100 moles of the main, 0.01 Mol ⁇ the fifth subcomponent ⁇ 0.5 mol.
- the electronic component according to the present invention is not particularly limited as long as it is an electronic component having a dielectric layer.
- the electronic component may be a multilayer ceramic capacitor element having a capacitor element body in which dielectric layers and internal electrode layers are alternately laminated. is there.
- the dielectric layer is composed of any one of the dielectric ceramic compositions.
- the conductive material contained in the internal electrode layer is not particularly limited, but is, for example, Ni or Ni alloy. In the present invention, the effect is particularly large when the thickness of the dielectric layer is less than about 10 m.
- the dielectric porcelain composition according to the present invention has a high relative dielectric constant and has a capacity-temperature characteristic satisfying the XIA characteristic of the EIA standard. For this reason, electronic components such as ceramic active capacitors using the dielectric ceramic composition of the present invention can be suitably used even in an environment exposed to high temperatures such as an engine room of an automobile.
- the dielectric ceramic composition according to the present invention does not contain elements such as Pb, Bi, and Zn that evaporate and scatter. Therefore, firing in a reducing atmosphere is possible. That is, according to the present invention, a dielectric material which has a high relative dielectric constant, can maintain the life of the insulation resistance, has a capacity-temperature characteristic satisfying the X8R characteristic of the EIA standard, and can be fired in a reducing atmosphere.
- a body porcelain composition can be provided.
- electronic components such as multilayer ceramic capacitors having a dielectric layer composed of the dielectric ceramic composition of the present invention can operate stably in various devices used in harsh environments such as electronic devices for automobiles. Therefore, the reliability of applied equipment can be significantly improved.
- the dielectric composition of the present invention can be expected to be effective also as a method for suppressing the deterioration of the temperature change rate in a high-temperature region due to the thinning of the dielectric layer.
- the dielectric porcelain composition according to the present invention has a long insulation resistance life and stable DC bias characteristics (dependence of permittivity on DC voltage application) and TC bias characteristics (capacitance temperature characteristics when DC voltage is applied). are doing.
- the dielectric porcelain composition according to the present invention does not contain harmful substances such as Pb and Bi, and therefore has little adverse effect on the environment due to disposal and disposal after use. Therefore, by using the dielectric ceramic composition of the present invention, it becomes easy to provide an electronic component such as a multilayer ceramic capacitor having excellent characteristics. Further, when the dielectric ceramic composition according to the present invention is used, even if the dielectric layer is thinned, the X8R characteristic can be satisfied, and furthermore, the reduction in the life of the insulation resistance can be effectively prevented. . Therefore, electronic components such as multilayer ceramic capacitors can be reduced in size and increased in capacity, and it is particularly easy to cope with thinner layers. For this reason, mounting on highly integrated circuits becomes easier.
- the capacitance-temperature characteristics tend to deteriorate as the thickness of one dielectric layer becomes thinner. That is, the rate of temperature change of the high-temperature side The curves tended to go clockwise.
- the capacity temperature change rate carp on the high temperature side can be directed in the counterclockwise direction. If this phenomenon is applied to electronic components that satisfy the X7R characteristic, it is possible to achieve a further reduction in the thickness of the dielectric layer per layer than before.
- the electronic component according to the present invention is not particularly limited, but includes a multilayer ceramic capacitor, a piezoelectric element, a chip inductor, a chip ball screw, a chip resistor, a chip resistor, and other surface mount (SMD) chip type electronic parts. And the like.
- FIG. 1 is a cross-sectional view of a multilayer ceramic capacitor according to one embodiment of the present invention
- FIG. 2 is a graph showing capacitance-temperature characteristics of a capacitor sample of Example 2
- FIG. 3 is a graph showing the DC bias characteristics of the capacitor sample of Example 3
- FIG. 4 is a graph showing the capacitance temperature characteristics of the capacitor sample of Example 5
- FIG. 5 is a graph showing the relationship between the content of the second subcomponent and the Curie temperature in Example 5,
- FIG. 6 is a graph showing the capacitance temperature characteristics of the capacitor sample of Example 7,
- FIG. 7 is a graph showing the DC bias characteristics of the capacitor sample of Example 7. BEST MODE FOR CARRYING OUT THE INVENTION
- the multilayer ceramic capacitor 1 shown in FIG. 1 will be exemplified as an electronic component, and its structure and manufacturing method will be described.
- a multilayer ceramic capacitor 1 as an electronic component includes a capacitor element main body 10 in which dielectric layers 2 and internal electrode layers 3 are alternately stacked. Having. A pair of external electrodes 4 are formed at both ends of the capacitor element body 10 so as to be electrically connected to the internal electrode layers 3 alternately arranged inside the element body 10.
- the shape of the capacitor element body 10 is not particularly limited, but is usually a rectangular parallelepiped. There are no particular restrictions on the dimensions, and the dimensions should be set appropriately according to the application. Usually, it is about (0.6 to 5.6 mm) x (0.3 to 5.0 mm) x (0.3 to 1.9 mm).
- the internal electrode layers 3 are laminated so that each end face is alternately exposed on the surfaces of the two opposing ends of the capacitor element body 10.
- the pair of external electrodes 4 are formed at both ends of the capacitor element body 10 and connected to the exposed end faces of the alternately arranged internal electrode layers 3 to form a capacitor circuit.
- the dielectric layer 2 contains the dielectric ceramic composition according to the present invention.
- the dielectric porcelain composition of the present invention comprises barium titanate (preferably represented by a composition formula: Ba m T i 0 2 + m , m is 0.995 ⁇ m ⁇ 1.010, and B a and T with a ratio of 0.995 ⁇ B a / T i ⁇ 1.010), and
- a first sub-component containing an oxide of AE (where AE is at least one selected from M :, Ca, Ba and Sr);
- a second subcomponent including an oxide of R (where R is at least one selected from Y, Dy, Ho and Er).
- the ratio of each subcomponent to 100 mol of the main component is as follows: the first subcomponent: 0 mol ⁇ the first subcomponent ⁇ 0.1 mol, the second subcomponent: 1 mol ⁇ the second subcomponent ⁇ 7 mol. More preferably, the first subcomponent: 0.01 mol ⁇ the first subcomponent ⁇ 0.1 mol, the second subcomponent: 1 mol ⁇ the second subcomponent ⁇ 6 mol, more preferably the first subcomponent.
- the ratio of the number of moles of the second subcomponent to the number of moles of the first subcomponent (second subcomponent / first subcomponent) is preferably 10 ⁇ (second subcomponent / first subcomponent) ⁇ 500, More preferably, 37.5 ⁇ (second subcomponent / first subcomponent) ⁇ 250, and still more preferably 37.5 ⁇ (second subcomponent / first subcomponent) ⁇ 125.
- the above ratio of the second subcomponent is not a molar ratio of R alone, but a molar ratio of an oxide of R. That is, for example, when using an oxide of Upsilon as a second subcomponent, that the ratio of the second subcomponent being 1 mole is not ratio of 1 mole of Upsilon, Upsilon 2 0 3 ratio is 1 mole Means that
- each oxide constituting the main component and each subcomponent is represented by a stoichiometric composition.
- the oxidation state of each oxide may deviate from the stoichiometric composition.
- the above ratio of each subcomponent is determined by converting the amount of metal contained in the oxide constituting each subcomponent to the above stoichiometric oxide.
- the first subcomponent (oxide of AE) has the effect of flattening the capacitance-temperature characteristics. If the content of the first subcomponent is too small, this effect becomes insufficient, and the capacity-temperature characteristics generally deteriorate. On the other hand, when the content of the first subcomponent increases beyond the range of the present invention, the capacity-temperature characteristic on the high temperature side tends to deteriorate again.
- the second subcomponent has an effect of shifting the Curie temperature to a higher temperature and an effect of flattening the capacitance-temperature characteristic. If the content of the second subcomponent is too small, such an effect becomes insufficient, and the capacity-temperature characteristics are deteriorated. On the other hand, if the content is too large, the sinterability tends to rapidly deteriorate.
- the dielectric ceramic composition of the present invention it is preferable that the sixth subcomponent including CaZ R_ ⁇ 3 or CaO + Z r0 2 is are further added.
- the sixth subcomponent has the effects of shifting the Curie temperature to a higher temperature side, flattening the capacitance-temperature characteristics, improving the insulation resistance (IR), improving the breakdown voltage, and lowering the firing temperature.
- the ratio of the sixth subcomponent with respect to 100 mol of the main component is preferably 0 mol ⁇ the sixth subcomponent ⁇ 5 mol, more preferably 0 mol and 3 mol of the sixth subcomponent. If the added amount of the sixth subcomponent is too large, the IR life is remarkably reduced, and the capacity-temperature characteristic tends to be deteriorated.
- Adding form of CAZ r 0 3 is not particularly limited, oxides composed of C a, such as C a 0, carbonates such as CAC0 3, organic compounds, and CaZr0 3.
- the ratio of Ca to Zr is not particularly limited, and may be determined to such an extent that it does not dissolve in the titanium titanate contained in the main component.
- the molar ratio of Ca to Zr (Ca / Zr) is as follows: It is preferably from 0.5 to 1.5, more preferably from 0.8 to 1.5, particularly preferably from 0.9 to 1.1.
- the third subcomponent acts mainly as a sintering aid, but has the effect of improving the defect rate of the initial insulation resistance when the thickness is reduced.
- the ratio of the third subcomponent to 100 mol of the main component is preferably 2 mol ⁇ third subcomponent ⁇ 10 mol, and more preferably 2 mol ⁇ third subcomponent ⁇ 6 mol.
- the dielectric ceramic composition of the present invention it is preferable that the fourth subcomponent including at least one Mn_ ⁇ and Cr 2 0 3 is are further added.
- the fourth subcomponent has the effect of promoting sintering, the effect of increasing IR, and the effect of improving IR life.
- the ratio of the fourth subcomponent with respect to 100 mol of the main component is preferably 0 mol ⁇ the fourth subcomponent ⁇ 0.5 mol, more preferably 0.1 mol ⁇ the fourth subcomponent ⁇ 0.5 mol. .
- the content of the fourth subcomponent (MnO Oyobi Cr 2 0 3) is too large, adversely affect the capacitance-temperature characteristics, can exacerbate the IR lifetime.
- the composition ratio of each oxide in the fourth subcomponent is arbitrary.
- the dielectric ceramic composition of the present invention V 2 Os
- a fifth subcomponent including at least one selected from Mo Oa and W0 3 is further added.
- the fifth subcomponent has the effect of flattening the capacitance-temperature characteristics above the Curie temperature and the effect of improving the IR life.
- the ratio of the fifth subcomponent with respect to 100 mol of the main component is preferably 0.01 mol ⁇ the fifth subcomponent ⁇ 0.5 mol, more preferably 0.01 mol ⁇ the fifth subcomponent ⁇ 0.2 mol. It is.
- the composition ratio of each oxide in the fifth subcomponent is arbitrary.
- the dielectric ceramic composition of the present invention in addition to the above oxides, Al 2 0 3 may be 6 each other in the sub-component further added including.
- Al 2 Os has little effect on the capacity-temperature characteristics and has the effect of improving sinterability, IR and IR life.
- the ratio of the sixth subcomponent is preferably 1 mol or less with respect to 100 moles of the main component, more preferably It is not more than 1 mol of the whole dielectric ceramic composition.
- BAT i0 3 containing these elements [for example (Ba, S r) T i0 3] It is preferable not to use as a main component. However, there is no particular problem as long as the level is contained as an impurity (about 0.1 mol% or less of the whole dielectric ceramic composition).
- the average crystal grain size of the dielectric ceramic composition of the present invention is not particularly limited, and may be appropriately determined, for example, in the range of 0.1 to 3 m according to the thickness of the dielectric layer.
- the capacitance-temperature characteristics tend to be worse as the dielectric layer is thinner, and worse as the average crystal grain size is smaller.
- the dielectric porcelain composition of the present invention can be used when it is necessary to reduce the average crystal grain size, specifically, when the average crystal grain size is 0.1 to 0.5 m. Especially effective. Also, if the average crystal grain size is reduced, the IR life is prolonged, and the change with time in the capacity under a DC electric field is reduced. preferable.
- the Curie temperature (the phase transition temperature from ferroelectric to paraelectric) of the dielectric ceramic composition of the present invention can be changed by selecting the composition, but in order to satisfy the X8R characteristics, It is preferably at least 120 ° C, more preferably at least 123 ° C. It should be noted that the kiyuri temperature can be measured by DSC (differential scanning calorimetry) or the like.
- an alternating electric field of 0.02 V / Aim or more, particularly 0.2 VZ / m or more, particularly 0.5 V / im or more, and generally about ⁇ / ⁇ or less is applied to the dielectric layer.
- a DC electric field of 5 V / m or less is superimposed and the temperature characteristics of the capacitor are stable even when such an electric field is applied.
- the conductive material contained in the internal electrode layer 3 is not particularly limited, but a base metal can be used since the constituent material of the dielectric layer 2 has reduction resistance.
- the base metal used as the conductive material Ni or a Ni alloy is preferable.
- the Ni alloy an alloy of Ni and one or more elements selected from Mn, Cr, Co and A1 is preferable, and the Ni content in the alloy is preferably 95% by weight or more.
- the Ni or Ni alloy may contain various trace components such as P in an amount of about 0.1% by weight or less.
- the thickness of the internal electrode layer may be appropriately determined according to the intended use and the like, but is usually preferably 0.5 to 5 Aim, particularly preferably about 0.5 to 2.5 m.
- the conductive material contained in the external electrode 4 is not particularly limited, but in the present invention, inexpensive Ni, Cu and alloys thereof can be used.
- the thickness of the external electrode may be determined as appropriate according to the application and the like, but is usually preferably about 10 to 50 Aim.
- the multilayer ceramic capacitor using the dielectric porcelain composition of the present invention like a conventional multilayer ceramic capacitor, produced a green chip by a normal printing method or a sheet method using a paste and fired the green chip. Then, it is manufactured by printing or transferring the external electrodes and firing them.
- the manufacturing method will be specifically described.
- the dielectric ceramic composition powder contained in the dielectric layer paste is prepared and made into a paint to prepare the dielectric layer paste.
- the dielectric layer paste may be an organic paint obtained by kneading a dielectric ceramic composition powder and an organic vehicle, or may be an aqueous paint.
- the dielectric porcelain composition powder As the dielectric porcelain composition powder, the above-mentioned oxides, mixtures thereof, and composite oxides can be used. In addition, various compounds that become the above-described oxides and composite oxides by firing, such as carbonates and oxides, can be used. Acid salts, nitrates, hydroxides, organometallic compounds and the like can be appropriately selected and used as a mixture. The content of each compound in the dielectric porcelain composition powder may be determined so as to have the above-described composition of the dielectric porcelain composition after firing.
- the particle size of the dielectric porcelain composition powder before coating is usually about 0.1 to 3 m in average particle size.
- the organic vehicle is obtained by dissolving a binder in an organic solvent.
- the binder used for the organic vehicle is not particularly limited, and may be appropriately selected from ordinary various binders such as ethyl cellulose and polyvinyl butyral.
- the organic solvent used is not particularly limited, and may be appropriately selected from various organic solvents such as terbineol, butyl carbitol, acetone, and toluene, depending on the method used, such as a printing method or a sheet method.
- the dielectric layer paste is an aqueous paint
- an aqueous vehicle in which a water-soluble binder / dispersant or the like is dissolved in water may be kneaded with a dielectric material.
- the water-soluble binder used for the aqueous vehicle is not particularly limited, and for example, polyvinyl alcohol, cellulose, water-soluble acrylic resin, etc. may be used.
- the paste for the internal electrode layer includes a conductive material made of the above-mentioned various dielectric metals or alloys, or various oxides, organometallic compounds, resinates, etc. which become the above-mentioned conductive material after firing, and the above-mentioned organic vehicle. Is prepared by kneading.
- the paste for the external electrode may be prepared in the same manner as the paste for the internal electrode layer described above.
- each paste is not particularly limited, and is usually a content, for example, about 1 to 5% by weight of a binder and about 10 to 50% by weight of a solvent. I just need. Further, each paste may contain additives selected from various dispersants, plasticizers, dielectrics, insulators, and the like, as necessary. Their total content is
- the content be 10% by weight or less.
- the dielectric layer paste and the internal electrode layer paste are laminated and printed on a substrate such as PET, cut into a predetermined shape, and then separated from the substrate to form a green chip.
- a green sheet is formed by using a dielectric layer paste, an internal electrode layer paste is printed thereon, and these are laminated to form a green chip.
- the binder removal treatment may be appropriately determined according to the type of the conductive material in the internal electrode layer paste.However, when a base metal such as Ni or Ni alloy is used as the conductive material, the oxygen content in the binder removal atmosphere is reduced. it is preferable that the 45 ⁇ 1 0 5 P a - a pressure of 1 0. When the oxygen partial pressure is less than the above range, the binder removal effect is reduced. When the oxygen partial pressure exceeds the above range, the internal electrode layer tends to be oxidized.
- the rate of temperature rise is preferably 5 to 300 ° C / hour, more preferably 10 to 100 ° C / hour, and the holding temperature is preferably 180 to 100 ° C / hour. 400 ° C., more preferably 200 to 350 ° C., and the temperature holding time is preferably 0.5 to 24 hours, more preferably 2 to 20 hours.
- the firing atmosphere is preferably air or a reducing atmosphere.
- the atmosphere gas in the reducing atmosphere for example, a mixed gas of N 2 and H 2 is preferably used after being humidified.
- the atmosphere during firing of the green chip may be appropriately determined according to the type of conductive material in the internal electrode layer paste, but when a base metal such as Ni or Ni alloy is used as the conductive material, oxygen partial pressure is preferably in a 1 0- 7 ⁇ 1 0- 3 P a . If the oxygen partial pressure is less than the above range, the conductive material of the internal electrode layer may abnormally sinter and be interrupted. If the oxygen partial pressure exceeds the above range, the internal electrode layer tends to be oxidized.
- the holding temperature during firing is preferably from 110 to 140 ° C., more preferably from 1200 to 138 ° C., and still more preferably from 120 to 130 ° C. ° C. Retention If the temperature is lower than the above range, the densification becomes insufficient, and if the temperature exceeds the above range, the electrode is interrupted due to abnormal sintering of the internal electrode layer, the capacity-temperature characteristic deteriorates due to the diffusion of the internal electrode layer constituent material, and the dielectric Reduction of the porcelain composition is likely to occur.
- the heating rate is preferably 50 to 500 ° C / hour, more preferably 200 to 300 ° C / hour, and the temperature holding time is preferably 0.5 to 8 hours, more preferably 1 to 8 hours.
- the cooling rate is preferably 50 to 500 ° C / hour, more preferably 200 to 300 ° C / hour.
- the firing atmosphere is preferably a reducing atmosphere.
- the atmosphere gas for example, a mixed gas of N 2 and H 2 is preferably used after being humidified.
- Annealing is a process for re-oxidizing the dielectric layer, which can significantly increase the IR lifetime, thereby improving reliability.
- the oxygen partial pressure in the anneal atmosphere is preferably 0.1 Pa or more, particularly 0.1 to 10 Pa.
- the oxygen partial pressure is less than the above range, reoxidation of the dielectric layer is difficult, and when the oxygen partial pressure exceeds the above range, the internal electrode layer tends to be oxidized.
- the holding temperature at the time of annealing is preferably 1100 ° C or less, particularly preferably 500 to 1100 ° C. If the holding temperature is lower than the above range, the oxidation of the dielectric layer becomes insufficient, so that the IR is low and the IR life tends to be short. On the other hand, if the holding temperature exceeds the above range, not only does the internal electrode layer oxidize and the capacity decreases, but also the internal electrode layer reacts with the dielectric substrate, resulting in deterioration of the capacity-temperature characteristics, lower IR, and lower IR. The life is likely to be shortened.
- annealing may be composed of only a heating process and a cooling process. That is, the temperature holding time may be set to zero. In this case, the holding temperature is synonymous with the maximum temperature.
- annealing conditions include a temperature holding time of preferably 0 to 20 hours, more preferably 2 to 10 hours, a cooling rate of preferably 50 to 500 ° C / hour, and more preferably 100 to 300 ° C / hour. Time. It is preferable to use, for example, humidified N 2 gas or the like as the annealing atmosphere gas.
- binder removal treatment firing and annealing, for example, a wetter or the like may be used to humidify the N 2 gas or the mixed gas.
- the water temperature is 5 ⁇ 75 ° C is preferred.
- the binder removal treatment, firing and annealing may be performed continuously or independently.
- the atmosphere was changed without cooling, and then the temperature was raised to the holding temperature at the time of firing, firing was performed, and then the temperature reached the holding temperature of anneal.
- the temperature is raised in the N 2 gas or humidified N 2 gas atmosphere to the holding temperature at the time of the binder removal treatment, and then the atmosphere is changed and the temperature is further raised
- the temperature may be raised to a holding temperature in an N 2 gas atmosphere, and then the atmosphere may be changed, or the entire annealing process may be performed in a humidified N 2 gas atmosphere.
- the external surface of the capacitor element body obtained as described above is polished by, for example, barrel polishing or sand blasting, and the external electrode paste is printed or transferred and baked to form the external electrode 4.
- the firing conditions for the external electrode paste are, for example, preferably about 10 minutes to 1 hour at 600 to 800 ° C. in a humidified mixed gas of N 2 and H 2. . Then, if necessary, a coating layer is formed on the surface of the external electrode 4 by plating or the like.
- the multilayer ceramic capacitor of the present invention thus manufactured is mounted on a printed circuit board or the like by soldering or the like, and is used for various electronic devices and the like.
- a multilayer ceramic capacitor has been exemplified as the electronic component according to the present invention.
- the electronic component according to the present invention is not limited to a multilayer ceramic capacitor, but may be a dielectric ceramic composition having the above composition. Any material may be used as long as it has a dielectric layer composed of
- Example 1 Example 1
- Carbonate as a raw material of MgO and MnO (the first subcomponent: MgC0 3, the fourth subcomponent: MnCOa) used, oxide to other materials (the second subcomponent: Y 2 0 3, the third subcomponent : (. Bao.s Cao 4) S iOa, fifth subcomponent: V 2 0 5) was used.
- a second byproduct fraction (Bao. 6 Ca 0.
- S i Oa is, BaCOs, C a C0 3 and S i 0 2 for 16 hours wet mixed by a ball mill, dried, air at 1 0.99 ° C It was produced by calcination in a wet mill and further wet milling with a pole mill for 100 hours.
- BAT I_ ⁇ 3 being the main component, a BaC0 3 and T i 0 2 and it it weighed amount, a ball mill for about 16 hours wet mixing using, after drying the temperature of 1 10 0 ° C
- the same characteristics were obtained by using a material that was baked in air for about 16 hours using a ball mill.
- the same characteristics were obtained when BaTioa, which is a main component, was prepared by a hydrothermal synthesis powder, an oxalate method, or the like.
- a 4.5 ⁇ m-thick green sheet is formed on the PET film using the dielectric layer paste, and the internal electrode layer paste is printed thereon. Then, the green sheet is peeled from the PET film. did. Next, these green sheets and a protective green sheet (without printing the inner electrode layer base) were laminated and pressed to obtain a green chip. The number of stacked sheets having internal electrodes was four.
- the green chip was cut into a predetermined size, subjected to binder removal treatment, fired, and annealed to obtain a fired multilayer ceramic article.
- the binder removal treatment is performed under the conditions of a heating time of 15 ° C / hour, a holding temperature of 350 ° C, a holding time of 2 hours, and a humidified N 2 + H 2 mixed gas atmosphere (oxygen partial pressure is 10 to 31 Pa). I got it.
- the firing was performed at a heating rate of 200 ° C / hour, holding temperature of 1260 ⁇ ; L 340 ° C, holding time of 2 hours, cooling rate of 300 ° C / hour, humidified N 2 + H2 mixed gas atmosphere (oxygen partial pressure was 10 — Performed under the conditions of 6 Pa).
- the annealing was performed under the conditions of a holding temperature of 1050 ° C, a temperature holding time of 2 hours, a cooling rate of 300 ° C / hour, and a nitrogen atmosphere.
- a holding temperature of 1050 ° C a temperature holding time of 2 hours
- a cooling rate of 300 ° C / hour a nitrogen atmosphere.
- an ice temperature of 35 ° C. was used.
- the paste for the external electrode is transferred to the end face, and fired at 800 ° C. for 10 minutes in a humidified N 2 + H2 atmosphere, and the external electrode is baked.
- a multilayer ceramic capacitor sample having the configuration shown in FIG. 1 was obtained.
- each sample thus obtained was 3.2 mm xl.6 mm x 0.6 mm, the number of dielectric layers sandwiched between the internal electrode layers was 4, and its thickness was 3 m. The thickness of the internal electrode layer was 1.5 m.
- Capacitance is measured on the capacitor sample in the temperature range of _55 to 160 ° C, and the capacitance at ⁇ 55 ° C, + 125 ° C and 150 ° C for the capacitance at + 25 ° C
- the rate of change (AC / C) was calculated, and the results are shown in Tables 1 and 2.
- the sample marked with r * j indicates a comparative example of the present invention.
- the ratio of the number of moles of the second subcomponent to the number of moles of the first subcomponent was 10 ⁇ (second subcomponent / first subcomponent). ) was within the range of ⁇ 500, and all showed good results.
- the sample of this example satisfies the X8R characteristic, has sufficiently high relative permittivity and absolute green resistance, and has no problem with dielectric loss.
- the sample of the present example satisfied not only the X8R characteristic but also the X7R characteristic of the EIA standard described above.
- the content of the first subcomponent was 0 mol (sample 6), 0.08 mol (sample 3), 1.0 mol ... (sample 1-1), 2.06 mol (sample 1-2)
- a capacitor sample was produced in the same manner as in Sample 3 of Example 1 except that the capacitance sample was changed.
- Example 1 was repeated except that the content of the first subcomponent was changed to 0.02 mol (sample 6-1), 0.04 mol (sample 4), and 0.08 mol (sample 3).
- a capacitor sample was fabricated in the same manner as in Sample 3 of. For these capacitor samples, DC bias characteristics (DC voltage application dependency of dielectric constant) were evaluated.
- the DC bias characteristic measures the change in capacitance ( ⁇ ⁇ / C) when a DC voltage is gradually applied to each capacitor sample at a constant temperature (25 ° C). The results are shown in FIG. As shown in FIG. 3, when the content of the first subcomponent is within the range of the present invention, the capacitance is hardly reduced even when a high voltage is applied, and it has been confirmed that the capacitor has stable DC bias characteristics.
- a capacitor sample was prepared in the same manner as in Sample 3 of Example 1, except that the content of the second subcomponent was changed as shown in Table 3. The same measurement as in Example 1 was performed on these capacitor samples. Table 3 shows the results.
- Second subcomponent Y 2 0 3
- the content of the second subcomponent is 1.5 mol (Sample 18), 2.1 mol (Sample 18-1), 2.5 mol (Sample 18-2), 3.0 mol (Sample 18-3) , 3.5 mol
- a capacitor sample was prepared in the same manner as in Sample 3 of Example 1 except that the sample was changed to (Sample 16).
- FIG. 4 also shows a rectangular range satisfying the X8R characteristic.
- the capacitance was measured using an LCR meter and the measurement voltage was IV. As shown in FIG. 4, it was confirmed that the capacitance temperature change rate was flattened as the content of the second subcomponent increased.
- Figure 5 shows the relationship between the content (Y 2 ⁇ 3 ) and the Curie temperature.
- the Curie temperature (Tc) was determined by measuring an endothermic peak by DSC (differential scanning calorimetry). As shown in FIG. 5, it was confirmed that the temperature of the lily shifted to the higher temperature side as the content of the second subcomponent increased. As a result, as shown in Fig. 4, it was confirmed that an improvement in the temperature characteristic of the capacitance (flattening) was observed.
- a capacitor sample was prepared in the same manner as in Sample 3 of Example 1, except that the type of the first subcomponent was changed as shown in Table 4. The same measurement as in Example 1 was performed on these capacitor samples. Table 4 shows the results.
- Mg oxide is effective in improving IR life while maintaining X8R characteristics. It was confirmed that it was a target.
- a capacitor sample was prepared in the same manner as in Sample 9 of Example 1, except that the type of the second subcomponent was changed as shown in Table 5. About these capacitor samples Then, the same measurement as in Example 1 was performed. The results are shown in Table 5 c
- FIG. 6 shows the capacitance-temperature characteristics of the capacitor samples (samples 9, 24 to 26) when the type of the second subcomponent (3.5 moles in terms of oxide) was changed.
- FIG. 6 also shows a rectangular range satisfying the X8R characteristic. The capacitance was measured using an LCR meter and the measurement voltage was IV. As shown in FIG. 6, it was confirmed that the capacitance-temperature characteristics became more flat when Y was included among Y, Dy, Ho, and Er.
- Example 1 DC bias characteristics (DC voltage dependence of dielectric constant) were evaluated using capacitor samples (samples 9, 24 to 26).
- the change in capacitance AC / C was measured in the same manner as in Example 3, and the results are shown in FIG. As shown in FIG. 7, it was confirmed that when the type of the second subcomponent was within the range of the present invention, the capacitance was hardly reduced even when a high voltage was applied, and the DC bias characteristics were stable.
- a capacitor sample was prepared in the same manner as in Sample 14-1 of Example 4, except that the content of the sixth subcomponent was changed as shown in Table 5-1. The same measurement as in Example 1 was performed on these capacitor samples. The results are shown in Table 5-1.
- the first 6 CAZ r0 3 is a subcomponent
- the CAC0 3 and Z R_ ⁇ 2 were mixed for 16 hours wet by the ball mill, dried, and calcined in air at 1 0.99 ° C, a ball mill to further 24 Manufactured by wet grinding for hours.
- the sixth subcomponent CaZr0 3
- the addition of the sixth sub-component has various effects such as flattening of the capacitance-temperature characteristics, improvement of the insulation resistance (IR), improvement of the breakdown voltage, and reduction of the firing temperature. It was confirmed that it could be done. Also, it was confirmed that when the content of the sixth subcomponent was too large, the IR life was remarkably reduced, and particularly the capacity-temperature characteristics on the high temperature side were deteriorated.
- a capacitor sample was prepared in the same manner as in Sample 3 of Example 1, except that the content of the third subcomponent was changed as shown in Table 6. The same measurement as in Example 1 was performed on these capacitor samples. Table 6 shows the results. Table 6
- the third subcomponent Mx (see claim 3) is calculated as follows: Ba ⁇ (BaS i 0 3 ), ⁇ ao.6 + S ro.4 (( ⁇ ao. 6 S ro.) S I_ ⁇ 3) and except for varying the sample 3 of example 1 (the third subcomponent:.. (Ba 6 Ca 4 ) to prepare a capacitor sample as S i 0 3). The same measurement as in Example 1 was performed on these capacitor samples. Table 7 shows the results.
- a capacitor sample was prepared in the same manner as in Sample 3 of Example 1, except that the content of the fourth subcomponent was changed as shown in Table 8. The same measurement as in Example 1 was performed on these capacitor samples. Table 8 shows the results. Table 8
- ** The mark with j indicates Ming's participation.
- a capacitor sample was produced in the same manner as in Sample 3 of Example 1, except that the type of the fourth subcomponent was changed as shown in Table 9. For these capacitor samples, the same measurement as in Example 1 was performed. Table 9 shows the results.
- a capacitor sample was prepared in the same manner as in Sample 3 of Example 1, except that the content of the fifth subcomponent was changed as shown in Table 10. The same measurement as in Example 1 was performed for these capacitor samples. The results are shown in Table 10.
- a capacitor sample was produced in the same manner as in Sample 3 of Example 1, except that the type of the fifth subcomponent was changed as shown in Table 11. The same measurement as in Example 1 was performed on these capacitor samples. Table 11 shows the results.
Description
Claims
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EP01974760A EP1262467B1 (en) | 2000-12-25 | 2001-10-10 | Dielectric porcelain composition and electronic parts |
DE60129533T DE60129533T2 (de) | 2000-12-25 | 2001-10-10 | Dielektrische porzellan zusammensetzung und elektronische teile |
US10/204,680 US6764976B2 (en) | 2000-12-25 | 2001-10-10 | Dielectric ceramic composition and electronic device |
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US (1) | US6764976B2 (ja) |
EP (1) | EP1262467B1 (ja) |
KR (1) | KR100484515B1 (ja) |
CN (1) | CN100400463C (ja) |
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CN114956808A (zh) * | 2022-06-15 | 2022-08-30 | 无锡市高宇晟新材料科技有限公司 | Mlcc陶瓷介质材料及其制备方法、高温稳定型的mlcc陶瓷及其制备方法、应用 |
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JP5146475B2 (ja) * | 2010-03-11 | 2013-02-20 | Tdk株式会社 | 誘電体磁器組成物およびセラミック電子部品 |
TWI639575B (zh) * | 2016-07-19 | 2018-11-01 | 禾伸堂企業股份有限公司 | Anti-reduction high-temperature stable composite dielectric ceramic material and manufacturing method thereof |
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KR20140118557A (ko) * | 2013-03-29 | 2014-10-08 | 삼성전기주식회사 | 유전체 자기 조성물 및 이를 포함하는 적층 세라믹 캐패시터 |
CN113488451A (zh) * | 2021-06-29 | 2021-10-08 | 上海华力微电子有限公司 | 浅沟槽隔离能力测试结构及其测试方法 |
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CN114956808A (zh) * | 2022-06-15 | 2022-08-30 | 无锡市高宇晟新材料科技有限公司 | Mlcc陶瓷介质材料及其制备方法、高温稳定型的mlcc陶瓷及其制备方法、应用 |
Also Published As
Publication number | Publication date |
---|---|
EP1262467A4 (en) | 2006-02-08 |
KR100484515B1 (ko) | 2005-04-20 |
EP1262467A1 (en) | 2002-12-04 |
CN100400463C (zh) | 2008-07-09 |
KR20020092966A (ko) | 2002-12-12 |
EP1262467B1 (en) | 2007-07-25 |
US6764976B2 (en) | 2004-07-20 |
CN1424991A (zh) | 2003-06-18 |
DE60129533T2 (de) | 2007-11-22 |
DE60129533D1 (de) | 2007-09-06 |
US20030125193A1 (en) | 2003-07-03 |
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