WO2006046597A1 - 導電性ペースト、及び積層型圧電セラミック部品 - Google Patents
導電性ペースト、及び積層型圧電セラミック部品 Download PDFInfo
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- WO2006046597A1 WO2006046597A1 PCT/JP2005/019680 JP2005019680W WO2006046597A1 WO 2006046597 A1 WO2006046597 A1 WO 2006046597A1 JP 2005019680 W JP2005019680 W JP 2005019680W WO 2006046597 A1 WO2006046597 A1 WO 2006046597A1
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- conductive paste
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/008—Selection of materials
- H01G4/0085—Fried electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/012—Form of non-self-supporting electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/87—Electrodes or interconnections, e.g. leads or terminals
- H10N30/871—Single-layered electrodes of multilayer piezoelectric or electrostrictive devices, e.g. internal electrodes
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/87—Electrodes or interconnections, e.g. leads or terminals
- H10N30/877—Conductive materials
Definitions
- the present invention relates to a conductive paste and a multilayer piezoelectric ceramic component, and more specifically, a conductive paste containing a metal powder and a ceramic powder as a solid content, and the conductive paste manufactured using the conductive paste.
- the present invention relates to a multilayer piezoelectric ceramic component.
- Multilayer piezoelectric ceramic parts are formed by alternately laminating ceramic layers and internal electrode layers. By reducing the thickness of the internal electrode layers, the cost can be reduced and the amount of displacement can be reduced. Can be increased.
- the internal electrode layer when the internal electrode layer is thinned, pores are formed in the internal electrode layer, and the coverage of the internal electrode layer on the ceramic layer is reduced, resulting in a reduction in the electrode area. As a result, the potential drops and the amount of displacement may decrease.
- the ceramic layer expands and contracts when a voltage is applied, so if the covering ratio decreases and the bonding strength between the ceramic layer and the internal electrode layer becomes weak, it is caused by repeated stretching movements. There is a possibility that the internal electrode layer and the ceramic layer are separated at the interface.
- the internal electrode includes first ceramic particles having an average particle size equal to or less than the average particle size of the conductor particles,
- Patent Document 1 a ceramic electronic component in which second ceramic particles that reach from one ceramic layer of the internal electrode to the other ceramic layer exist.
- Patent Document 1 the first ceramic particles 0.05 to 1 times the average particle size of the conductor particles are added in an amount of 10 to 50% by weight based on the added amount of the conductor particles, and the average particle size of the conductor particles is increased.
- Diameter 2 ⁇ 10 Interface of the second ceramic particles twice, by 01-1 weight 0/0 added 0.5 to hydrogenation mosquito ⁇ conductor particles, the generation of cracks and internal electrode layers and ceramic layers inside the laminate This suppresses peeling.
- the first ceramic particles equal to or less than the conductor particles are interspersed between the conductor particles, whereby the coefficient of thermal expansion of the internal electrode layer 101 is reduced.
- the heat shock is mitigated by approaching the thermal expansion coefficient of the back layer 102, thereby reducing the occurrence of cracks.
- the second ceramic particles 103 exist so as to reach from one ceramic layer of the internal electrode to the other ceramic layer, the second ceramic particles 103 form a column, and therefore, the ceramic layers 102 sandwiching the internal electrode layer 101 are formed with each other. Bonding is performed via the second ceramic particles 103, whereby the bonding strength between the internal electrode layer 101 and the ceramic layer 102 can be improved, and peeling at the interface can be suppressed.
- the internal electrode includes a metal powder and a ceramic powder having an average particle size equal to or less than 1/2 of the average particle size of the metal powder, and the ceramic powder has a total solid content.
- Patent Document 2 A multilayer ceramic electronic component formed by firing a conductive paste contained at a ratio of 2 to 40% by weight has also been proposed (Patent Document 2).
- Patent Document 2 Ni powder having an average particle diameter of 0.4 ⁇ m and an average particle diameter of 0.2 ⁇ m are used.
- the ceramic powder is the same material as the ceramic forming the ceramic green sheet
- the adhesion is improved, thereby preventing interfacial peeling between the ceramic layer and the internal electrode layer.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2000-277369
- Patent Document 2 Japanese Patent Laid-Open No. 11-354374
- Patent Document 1 since the second ceramic particles 103 form columns as described above, the bonding strength between the internal electrode layer 101 and the ceramic layer 102 is excessively strengthened. Therefore, when the technology of Patent Document 1 is applied to a multilayer piezoelectric ceramic component and a voltage is applied The driving displacement of the ceramic layer is constrained by the internal electrode layer. In addition, since the covering force is reduced due to the formation of the pillars, a potential drop occurs when a voltage is applied, which makes it difficult to obtain a desired large displacement.
- Patent Document 2 contains a ceramic powder in addition to metal powder in the internal electrode to improve adhesion and smooth the internal electrode.
- a multilayer ceramic capacitor is used as a multilayer ceramic electronic component.
- it is not intended, and it is unclear whether a bonding strength that can withstand repeated stretching movements can be obtained.
- Patent Document 2 uses a ceramic powder having a large average particle diameter of about 0.2 am or 0.1 ⁇ m in the case of Ni powder having an average particle diameter of 0.4 am, for example. Therefore, the so-called displacement restraining force that restrains the displacement amount due to the formation of the pillars may increase, and the coverage may also decrease. Therefore, even if the conductive paste of Patent Document 2 is applied to a multilayer piezoelectric ceramic component, it is difficult to obtain a desired large displacement even if the internal electrode layer is made thin, as in Patent Document 1. There was a point.
- the present invention has been made in view of such problems, and can improve the bonding strength between the ceramic layer and the internal electrode layer, and has a large amount of displacement. It is an object of the present invention to provide a conductive paste capable of obtaining the above and a laminated piezoelectric ceramic component manufactured using the conductive paste.
- the present invention has been intensively studied to achieve the above object, and as a conductive paste, an ultrafine ceramic powder having a specific surface area of 5 to 20 times that of a metal powder is mixed with a metal powder.
- the content of the ceramic powder is set to 20 to 50% by weight with respect to the total solid content in the conductive paste, that is, the total of the metal powder and the ceramic powder. Even when the layer thickness was reduced to 7 zm or less, a multilayer piezoelectric ceramic component with a coverage of 95% or more could be obtained.
- a conductive paste capable of improving the bonding strength between the ceramic layer and the internal electrode layer and realizing a multilayered piezoelectric ceramic component having a large displacement can be obtained.
- the conductive base according to the present invention is a conductive paste for forming an electrode of a piezoelectric ceramic component, and comprises a metal powder. And a ceramic powder having a specific surface area of 5 to 20 times that of the metal powder, and the content of the ceramic powder is 20 to 50 weights with respect to the total of the metal powder and the ceramic powder. %.
- the inventors of the present invention manufactured a multilayer piezoelectric ceramic component using the above conductive paste, and performed composition analysis on a small predetermined region of the conductive paste in a dry state.
- the area where the ceramic powder content in the predetermined region is 80% or less of the content of the ceramic powder contained in the conductive paste is 10% or less in area ratio, the voids in the internal electrode layer It has been found that the growth can be further effectively suppressed and the coverage can be improved.
- the content of the ceramic powder in each predetermined region is 80% of the total content of the ceramic powder.
- the following areas are characterized by an area ratio of 10% or less.
- the conductive paste contains 70% by weight or more of relatively inexpensive Ag, it is possible to achieve both the bonding strength and the amount of displacement described above, and in particular, a laminated piezoelectric material having a good amount of displacement. The ability to obtain ceramic products is possible.
- the metal powder preferably has an Ag content of 70% by weight or more.
- the ceramic layer and the internal electrode layer are alternately laminated to form a ceramic body, and external electrodes are formed on both end faces of the ceramic body.
- the internal electrode layer is formed by sintering the conductive paste.
- the thickness of the internal electrode layer can be reduced to 1.7 xm or less, and the coverage is also 95% or more.
- the power S can be.
- the thickness of the internal electrode layer is 1.7 ⁇ m or less, and the coverage of the internal electrode layer on the ceramic layer is 95% or more. It is a feature. The invention's effect
- the metal powder and the ceramic powder having a specific surface area of 5 to 20 times that of the metal powder, the total amount of the ceramic powder being the total of the metal powder
- the ceramic powder in the conductive paste is uniformly dispersed, the ceramic Darin sheet and the conductive paste are co-sintered during the manufacturing process of the laminated piezoelectric ceramic component.
- the ceramic powder in the conductive paste diffuses into the ceramic layer (ceramic green sheet) before the internal electrode layer is sintered, and the metal powder in the internal electrode is rapidly sintered. As a result, it is possible to suppress the formation of columns made of ceramic powder in the internal electrode layer.
- the content of the ceramic powder is 20 to 50% by weight with respect to the total of the metal powder and the ceramic powder. Suppression can be suppressed, and it is possible to suppress the growth of vacancies in the internal electrode layer that proceed simultaneously.
- the conductive paste even when ceramic powder is contained in the conductive paste, the formation of pillars in the internal electrode layer and the growth of vacancies are suppressed. Therefore, even if the internal electrode layer is made thinner, the bonding strength between the internal electrode layer and the ceramic layer can be increased, and the desired force and displacement can be increased. Achieving a conductive paste capable of obtaining a multilayer piezoelectric ceramic component having a sufficient amount can be achieved.
- the content of the ceramic powder in each predetermined region is 80% of the total content of the ceramic powder. Since the area force area ratio is 10% or less, it can be seen that the dispersibility of the ceramic powder in the internal electrode layer is good. Therefore, even if the conductive paste is sintered, the ceramic powder acts as a pinning to the metal powder being sintered, preventing rapid sintering of the metal powder, and as a result, the growth of vacancies that progress simultaneously with this. As a result, the coverage of the internal electrode layer can be improved.
- the conductive paste of the present invention has an Ag content of 70 wt% or more in the metal powder.
- the conductive paste of the present invention has an Ag content of 70 wt% or more in the metal powder.
- the conductive paste of the present invention is useful in a multilayer piezoelectric ceramic component that requires a large amount of displacement and requires a large bonding strength with respect to the large amount of displacement.
- it is particularly effective in a multilayer piezoelectric ceramic component of a type formed by co-sintering a ceramic layer and internal electrodes.
- the piezoelectric ceramic layers and the internal electrode layers are alternately laminated to form a ceramic body, and external electrodes are formed on both end faces of the ceramic body.
- the internal electrode layer is formed by sintering the conductive paste, so that a multilayer piezoelectric ceramic component having a large displacement and bonding strength can be obtained.
- the ceramic of the internal electrode layer can be manufactured by using the conductive paste, even if the thickness of the internal electrode layer is 1.7 ⁇ or less.
- the coverage of the layer can be 95% or more, and therefore, a multilayer piezoelectric ceramic component having a large amount of displacement while having a large bonding strength can be obtained.
- FIG. 1 is a diagram for explaining a dispersion state of a ceramic powder contained in a conductive paste according to the present invention.
- FIG. 2 is a cross-sectional view showing an embodiment of a multilayer piezoelectric actuator as a multilayer piezoelectric ceramic component manufactured using the conductive paste of the present invention.
- FIG. 3 is an enlarged cross-sectional view of a main part of an internal electrode layer showing an example of background art.
- the conductive paste according to the present invention comprises a metal powder having a specific surface area of 2 to 4m 2 Zg, a ceramic powder having a specific surface area of 5 to 20 times that of the metal powder, and an organic vehicle.
- the content of the ceramic powder is 20 to 50% by weight based on the total amount of the metal powder and the ceramic powder (hereinafter referred to as “solid content”).
- a multilayer piezoelectric ceramic component such as a multilayer piezoelectric actuator is required to obtain a large amount of displacement when a voltage is applied. Therefore, even if the internal electrode is smoothed as described in the section of [Background Art] and [Problems to be Solved by the Invention] as a result of the inclusion of ceramic powder as a solid content in the conductive paste, If a large number of pillars are formed in the internal electrode layer, the bonding strength between the internal electrode layer and the ceramic layer is excessively strengthened. As a result, the interfacial peeling is suppressed, but the displacement restraint force increases. .
- ceramic powder having a specific surface area of 5 to 20 times that of metal powder is prepared, and the content of the ceramic powder is 20 to 50% by weight with respect to the total solid content.
- the ceramic powder is contained in a conductive paste.
- the ceramic powder having the predetermined specific surface area is contained in the predetermined amount, the ceramic powder is uniformly dispersed in the manufacturing process of the multilayer piezoelectric ceramic component. Even if the internal electrode layer is formed using the conductive paste and the conductive paste and the ceramic green sheet are co-sintered, the internal electrode layer The ceramic powder diffuses into the ceramic layer (ceramic green sheet) before sintering and can suppress the formation of pillars in the internal electrode layer and suppress the rapid sintering of the metal powder. In addition, the shrinkage of the internal electrode layer can be prevented and the coverage can be improved.
- the content of the ceramic powder is 20 to 50% by weight with respect to the total solid content, so that rapid sintering of the metal powder was suppressed during the co-sintering. As a result, the growth of vacancies that can be formed in the internal electrode layer can be suppressed, and this also improves the coverage.
- the ceramic powder having a specific surface area of 5 to 20 times that of the metal powder is contained in the conductive paste in the range of 20 to 50% by weight.
- the internal electrode shrinks due to abrupt sintering of the metal powder, which is also successfully dispersed in the conductive paste and thus does not cause a local decrease in the amount of the ceramic powder.
- voids in the internal electrode layer are suppressed. Growth is also suppressed, and the coverage of the internal electrode layer can be improved in combination with the specific surface area of the ceramic powder.
- the present conductive paste has a high effect of improving the coverage as described above, the internal electrode can be thinned and the electrode area can be increased, thereby increasing the amount of displacement and bonding strength.
- Type piezoelectric ceramic component can be obtained.
- the specific surface area of the ceramic powder is set to 5 to 20 times the specific surface area of the metal powder as described above for the following reason.
- the specific surface area of the ceramic powder is less than 5 times the specific surface area of the metal powder, the dispersibility of the ceramic powder in the conductive paste decreases due to the large particle size of the ceramic powder, and the internal electrode layer Therefore, sufficient bonding strength cannot be obtained.
- the specific surface area of the ceramic powder exceeds 20 times the specific surface area of the metal powder, the ceramic powder contained in the conductive paste aggregates, which makes the ceramic powder sufficiently in the ceramic layer. There is a possibility that a column is formed in the internal electrode layer without being diffused.
- the specific surface area of the ceramic powder is 5 to 20 times, preferably 10 to 20 times the specific surface area of the metal powder.
- the ratio table area of the ceramic powder in the above preferred range, it is possible to obtain a higher coverage ratio and a larger displacement amount S.
- the content of the ceramic powder is less than 20% by weight with respect to the total solid content, the content of the ceramic powder becomes too small, so that the pore diameter in the internal electrode layer increases and the coverage decreases. For this reason, the bonding strength at the interface between the internal electrode layer and the ceramic layer is lowered.
- the content exceeds 50% by weight, when the conductive paste and the ceramic green sheet are co-fired, the ceramic powder that has not diffused into the ceramic layer remains in the internal electrode layer to form columns. As a result, the bonding strength becomes excessively large and the displacement restraining force also increases, resulting in a decrease in the amount of displacement.
- the content of the ceramic powder is 20 to 20% of the total solid content.
- the ceramic powder contained in the conductive paste of the present invention does not necessarily have the same or similar component composition as the ceramic material forming the ceramic layer. However, since the ceramic powder contained in the conductive paste also diffuses to the ceramic layer side during firing, a ceramic material having the same or similar component composition as the ceramic material forming the ceramic layer is used from the viewpoint of preventing characteristic fluctuations. More preferably.
- a dry film (for example, 40 ⁇ m in length and 40 ⁇ m in width) obtained by drying the conductive paste is used to form a predetermined area 1 ⁇ ′ ⁇ 1 in a matrix form as shown in FIG. Divided into
- the content of the ceramic powder in a predetermined region is determined by the conductive paste.
- the area of 80% or less of the ceramic powder content contained in is 10% or less in area ratio.
- the amount of the ceramic powder is uniformly and uniformly dispersed in the conductive paste with a small number of locally reduced regions, and thereby the internal electrode as a dry film.
- the growth of vacancies in the layer can be suppressed and the vacancy diameter can be prevented from expanding, and the coverage can be improved.
- the ceramic powder is uniformly and uniformly dispersed in the conductive paste, even if the conductive paste is sintered, the ceramic powder acts as a pinning to the metal powder being sintered. Internal electrode layer by rapid sintering of metal powder As a result, the growth of vacancies in the internal electrode layer, which proceeds simultaneously with this, is suppressed, thereby improving the coverage of the internal electrode layer.
- the content of the ceramic powder in the predetermined region when the area that is 80% or less of the content of the ceramic powder contained in the conductive paste is 8% or less in area ratio, It is more preferable because the coverage is further improved.
- the ceramic powder contained in the conductive paste a material having the same composition as that of the ceramic material used for the multilayer piezoelectric ceramic component, for example, a PZT material is used.
- the metal powder preferably contains 70 wt% or more of Ag.
- the content of Ag in the metal powder is increased, the melting point of the conductive paste is lowered, and thus the sintering temperature is lowered, so that it is difficult to increase the coverage of the internal electrodes.
- the above conductive paste can provide a high coverage even if the Ag content is 70% by weight or more, and Ag is more flexible than other electrode materials such as Ni alone and Pd alone. A larger displacement amount can be obtained.
- an organic binder such as methyl cellulose resin or ethyl cellulose resin dissolved in a terpene solvent, an organic solvent such as terbinol or butyl carbitol in a predetermined blending amount is used. be able to.
- an organic vehicle is produced by dissolving an organic binder in an organic solvent.
- a metal powder having a predetermined specific surface area for example, 2 to 4 m 2 / g
- the metal powder is mixed with the organic vehicle and kneaded with a three-roll mill or the like. Get.
- a ceramic raw material having the same composition as the ceramic raw material of the multilayer piezoelectric ceramic component is put into a forced stirring device such as a bead stirring type pulverizer and pulverized to give 5 to 20 times the metal powder.
- a forced stirring device such as a bead stirring type pulverizer and pulverized to give 5 to 20 times the metal powder.
- a ceramic powder having a specific surface area of is prepared.
- the ceramic powder and the organic vehicle are mixed, and the ceramic powder is sufficiently dispersed in the organic vehicle using a forced stirring device such as the bead stirring mill, thereby obtaining a ceramic paste. .
- the content of the ceramic powder in the solid content is 20 to 5
- the metal paste and the ceramic paste are kneaded with a three-roll mill or the like so as to be 0% by weight, thereby producing the conductive paste.
- FIG. 2 is a cross-sectional view showing an embodiment of the multilayer piezoelectric actuator, wherein the multilayer piezoelectric actuator includes a ceramic layer 2 (2a to 2h) and an internal electrode layer 3 (3a to 3g).
- the piezoelectric ceramic body 4 is formed by alternately stacking, and the external electrodes 5 (5a, 5b) made of a conductive material such as Ag are formed at both ends of the piezoelectric ceramic body 4.
- one end of the internal electrodes 3a, 3c, 3e, 3g is electrically connected to one external electrode 5a, and one end of the internal electrodes 3b, 3d, 3f is electrically connected to the other external electrode 5b. Connected.
- the multilayer piezoelectric actuator when a voltage is applied between the external electrode 5a and the external electrode 5b, the multilayer piezoelectric actuator is displaced in the stacking direction indicated by the arrow X due to the piezoelectric longitudinal effect.
- the multilayer piezoelectric actuator is manufactured using the conductive paste, so that even if the film thickness of the internal electrode layer 3 is set to 1 ⁇ 7 ⁇ or less, the ceramic layer 2 of the internal electrode layer 3 is formed. Therefore, it is possible to obtain a highly reliable laminated piezoelectric actuator having a large bonding strength that can withstand repeated expansion and contraction, and that has a large displacement when an electric field is applied.
- the film thickness of the internal electrode layer 3 is preferably 0.8 ⁇ or more. This is because when the film thickness of the internal electrode layer 3 becomes thinner than 0.8 ⁇ , it becomes difficult to maintain the coverage of the internal electrode layer 3 at 95% or more, and sufficient bonding strength cannot be obtained. is there.
- a predetermined amount of a ceramic raw material such as PbO, TiO, ZrO, NbO is weighed, and then
- the weighed product is put into a ball mill together with a grinding medium such as zirconia and water and sufficiently wet-pulverized, and further calcined at a predetermined temperature (for example, 600 to 1000 ° C.) to prepare a calcined product, and then dissolved. Add the agent and dispersant and wet pulverize again in the ball mill to make ceramic raw material powder.
- a grinding medium such as zirconia and water
- an organic binder plasticizer is added to the ceramic raw material powder thus prepared. Then, a wet mixing process is performed to form a slurry, and then a forming process is performed using a doctor blade method or the like to produce a ceramic green sheet.
- ceramic green sheets on which electrode patterns are not screen-printed are arranged above and below in the laminating direction and pressed to form a laminate. Make it.
- the laminate is cut into a predetermined size, accommodated in an alumina sheath, subjected to a debinding process at a predetermined temperature (for example, 250 to 500 ° C.), and then subjected to a predetermined temperature (for example, 950). ⁇ : 1100 ° C.) to form a piezoelectric ceramic body 4 in which ceramic layers 2 and internal electrode layers 3 are alternately laminated.
- the same conductive paste for external electrodes made of Ag or the like is applied to both ends of the piezoelectric ceramic body 4, and a baking process is performed at a predetermined temperature (for example, 750 ° C to 850 ° C).
- the external electrodes 5a and 5b are formed and further subjected to a predetermined polarization process, whereby a laminated piezoelectric actuator is manufactured.
- the external electrodes 5a and 5b may be formed by a thin film forming method such as a sputtering method or a vacuum deposition method as long as the adhesion is good.
- the thickness of the internal electrode layer 3 is set to 1.7 ⁇ ⁇ or less.
- the coverage ratio of the internal electrode layer 3 to the ceramic layer 2 can be 95% or more, and a laminated piezoelectric actuator having a large displacement and a high bonding strength can be obtained.
- oxides such as Pb 2 O were used as ceramic raw materials, but carbonates and hydroxides were used.
- the present invention is suitable for the multilayer piezoelectric actuator that requires a particularly large amount of displacement in the multilayer piezoelectric ceramic electronic component, but various other types such as a piezoelectric oscillator, a piezoelectric buzzer, and a piezoelectric sensor are also available. It goes without saying that it can be applied to multilayer piezoelectric ceramic electronic components.
- PZT ceramic material containing Pb (Zr Ti) 0 as a main component and containing 2 mol of Nb component per 100 mol of the main component is prepared, and this PZT ceramic material is pulverized with beads. It was put into a machine and pulverized to produce 5 types of ceramic powders with a specific surface area Sc of 8-40.
- the ceramic powder and the organic vehicle are put into a bead stirring type dusting machine so that the organic vehicle becomes 80 parts by weight with respect to 100 parts by weight of the ceramic powder, and dispersion treatment is performed for 40 minutes.
- a ceramic paste was prepared.
- the metal paste and the ceramic paste are kneaded so that the content of the ceramic powder is 30% by weight with respect to the total of the ceramic powder and the metal powder, which are solid components, and thereby the conductive paste.
- the content of the ceramic powder is 30% by weight with respect to the total of the ceramic powder and the metal powder, which are solid components, and thereby the conductive paste.
- a PZT-based ceramic material used in the preparation of the ceramic paste was prepared and pulverized so as to have a specific surface area force of 3 ⁇ 4 m 2 / g to obtain a ceramic raw material.
- a solvent and a dispersant are added to the ceramic raw material and wet pulverized. Thereafter, a predetermined amount of an ethyl cellulose resin as an organic binder and a predetermined additive are added and wet-mixed, and the ceramic raw material is mixed. A rally was made.
- this ceramic slurry was formed into a sheet using a doctor blade method, and a ceramic green sheet was prepared so that the thickness of the fired ceramic layer was 20 am.
- the coverage of the internal electrode layer to the ceramic layer, the amount of displacement, and the bending strength were measured.
- the bonding strength between the internal electrode layer and the ceramic layer was evaluated based on the bending strength at the interface between the ceramic layer and the internal electrode layer.
- the coverage of the internal electrode layer was quantified by peeling each sample along the internal electrode layer, capturing microscopic photographs of pores scattered in the internal electrode layer, and performing image analysis processing.
- the displacement was measured with a laser displacement meter under a frequency of 1 kHz and applying an electric field of lOOOVZmm.
- the bending strength is determined by bonding a ceramic plate to both main surfaces of each sample, cutting out a square column with a dicing saw, preparing a test piece, performing a bending test on each test piece, The strength when peeled was measured and determined. In this example, the bonding strength between the internal electrode layer and the ceramic layer was evaluated based on the bending strength. [0093] Next, for sample numbers 2 to 6, mapping analysis was performed using WDX (Wavelength Dispersive X-ray Spectroscopy), and the internal electrode layer (70 ° C, 10 ° C) was analyzed.
- WDX Widelength Dispersive X-ray Spectroscopy
- the strength distribution of the ceramic powder contained in the dried film is measured, and the content of the ceramic powder in the specified region (41.0 zm X 41.0 ⁇ m), that is, the partial content is conductive.
- Pixels that were 80% or less were defined as defective pixels, the total area of the defective pixels was calculated, and the area ratio relative to the entire measurement region was calculated.
- Table 1 shows the specifications of the conductive paste in Sample Nos. 1 to 17: the thickness of the internal electrode layer, and the measurement results.
- Sample No. 2 has a small specific surface area ratio Sc / Sm force of ceramic powder and metal powder, the area ratio is reduced when the internal electrode layer thickness is reduced to 1.7 / m. 12.0%, exceeding 10%, and therefore the formation of vacancies in the internal electrode layer is considered to be encouraged, so the coverage is lowered to 92%, and the bending strength is 99 MPa. It was found that the bonding strength between the internal electrode layer and the ceramic layer deteriorated.
- Sample No. 7 also has a specific surface area ratio ScZSm of ceramic powder and metal powder as small as 4, so when the internal electrode layer thickness is reduced to 1.5 zm, the coverage is 88%. It was found that the bending strength decreased to 86 MPa, and the bonding strength between the internal electrode layer and the ceramic layer deteriorated.
- Sample No. 15 also has a specific surface area ratio ScZSm of ceramic powder and metal powder of 3.75, so the coating rate is 90% when the internal electrode layer thickness is reduced to 1.5 zm. %, The bending strength decreased to 88 MPa, and the bonding strength between the internal electrode layer and the ceramic layer deteriorated.
- Sample Nos. 1, 3 to 6, 8 to: 14, 16, and 17 have a specific surface area ratio Sc / Sm of ceramic powder to metal powder of 5 to 20, and the strength is also ceramic powder. Since the content in the solid content is 3 ⁇ 40% by weight, even if the thickness of the internal electrode layer is reduced to 0.8 to 1.7 ⁇ , the coverage is 95 to 100%. As a result, the bending strength is 106 to 114 MPa, the bonding strength between the internal electrode layer and the ceramic layer is good, and the displacement when electric field is applied is as large as 0.780-0.844 ⁇ . It was found that a multilayer piezoelectric ceramic component that can provide a large bonding strength can be obtained.
- this conductive paste is suitable for thinning the internal electrode layer.
- the ceramic powder content in the predetermined divided region is a region where the ceramic powder content (30 wt%) in each conductive paste is 80% or less, that is, 24
- region used as weight% or less was compared.
- the area ratio is 10 for sample numbers 3 to 6 where Sc / Sm is 5 or more. /. It was found that the amount of displacement, the coverage of the internal electrode, and the bending strength were within the scope of the present invention. That is, 80 of ceramic powder content in electrical paste. / 0 if the following as a region is equal to or less than 10% by area ratio, improved coverage of the internal electrodes, and it was confirmed that the large internal electrode bonding strength is obtained.
- a metal powder having a specific surface area 3111 of 2111 2 / ⁇ (eight parts : 70% by weight, (1: 30% by weight)) was prepared, and a metal paste was prepared in the same manner as in [Example 1].
- a ceramic paste was prepared by the same procedure as in [Example 1] except that the particle size was adjusted so that the specific surface area Sc of the ceramic material was 20 m 2 / g.
- a ceramic green sheet was prepared in the same manner as in [Example 1].
- Table 2 shows the specifications of the conductive paste, sample electrode thickness, internal electrode layer thickness, and the above measurement results for sample numbers 2:! -28.
- the sample number 21 is a ratio of the specific surface area of the ceramic powder and the metal powder Sc / Sm is 10.
- the content of the ceramic powder relative to the solid content is 15% by weight, 20 Since it was less than wt%, the coverage of the internal electrode layer was greatly reduced to 89%, and the bending strength was as small as 81 MPa, indicating that the bonding strength was poor.
- Sample No. 28 also has a specific surface area ratio ScZSm of 10 for the ceramic powder and metal powder, but the content of the ceramic powder with respect to the solid content is excessive at 60% by weight. As a result, a large amount of ceramic powder remains and the bonding strength is excessively strengthened, and the bending strength is increased to 142 MPa, the displacement restraint force is increased and the displacement is decreased to 0.75 6 ⁇ m. It was.
- Sample Nos. 22 to 27 have a content of 20 to 50% by weight based on the solid content of the ceramic powder, and the ratio of the specific surface area between the ceramic powder and the metal powder is ScZSm of 10. some because the coverage of the internal electrode layer is 95 to 97 weight 0/0, the displacement amount 0. 778 ⁇ 0. 820 / m and the large instrument flexural strength increases with 102 ⁇ 125MPa, good bond strength It was found that
- a metal paste was prepared in the same manner as in the above procedure.
- composition formula is represented by 0.20Pb (Ni Nb) 0 _0. 40PbZrO _0. 40PbTiO.
- the ceramic material was put into a bead stirrer and pulverized to produce four types of ceramic powders having a specific surface area Sc of 8 to 35.
- a ceramic green sheet was prepared in the same manner as in [Example 1].
- the laminated piezoelectric ceramic parts Nos. 31 to 42 were prepared in the same manner as in Example 1].
- the firing temperature was 1025 ° C, 1000 ° C, and 975 ° C depending on the blending ratio of Ag and Pd of the metal powder. This is because the melting point varies depending on the amount of the metal powder, and the firing temperature is changed.
- Table 3 shows the specification of the conductive paste, the thickness of the internal electrode layer, the firing temperature, and the measurement results for Sample Nos. 31 to 42.
- Pb (Ni, Nb) O PZT material is PZT ceramic material used in Examples 1 and 2
- the internal electrode layer is made thinner as shown in Table 3.
- the displacement amount can be further increased.
- sample No. 31 has a small Sc / Sm force S4 between the specific surface area of the metal powder and the specific surface area of the ceramic powder, and the coverage of the internal electrode layer is as small as 92%. It was found that the bending strength was as low as 80 MPa and the bonding strength was inferior.
- Sample No. 35 also has a small surface area ratio ScZSm force S4 of ceramic powder and metal powder. Therefore, as with Sample No. 31, the bending strength at which the coverage of the internal electrode layer is 93% is low. 87M
- Sample No. 39 also has a small surface strength ratio ScZSm force S4 of ceramic powder and metal powder. Therefore, as with Sample No. 31, it has a low bending strength with an internal electrode layer coverage of 91%. 81M
- Sample Nos. 32-34, 36-38, and 40-42 have a specific surface area ratio of Sc / Sm force of 3 ⁇ 4 or more and the ceramic powder content is 30% by weight with respect to the solid content. It was also found that the covering ratio of the internal electrode layer was 95 to 100%, and that a large bonding strength was obtained while maintaining a large displacement amount of 98 to 115 MPa in bending strength.
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JP2008085041A (ja) * | 2006-09-27 | 2008-04-10 | Kyocera Corp | 積層セラミックコンデンサおよびその製法 |
CN101872834A (zh) * | 2010-05-20 | 2010-10-27 | 中山大学 | 一种弯曲振动型压电变压器 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0745883A (ja) * | 1993-07-29 | 1995-02-14 | Murata Mfg Co Ltd | 圧電磁器組成物 |
JPH11354374A (ja) * | 1998-06-03 | 1999-12-24 | Murata Mfg Co Ltd | 積層セラミック電子部品、積層セラミック電子部品の製造方法及び内部電極形成用導電ペースト |
JP2004111939A (ja) * | 2002-08-29 | 2004-04-08 | Ngk Insulators Ltd | 積層型圧電素子及びその製造方法 |
JP2004288548A (ja) * | 2003-03-24 | 2004-10-14 | Noritake Co Ltd | 圧電セラミック材用導体ペースト及びその利用 |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0745883A (ja) * | 1993-07-29 | 1995-02-14 | Murata Mfg Co Ltd | 圧電磁器組成物 |
JPH11354374A (ja) * | 1998-06-03 | 1999-12-24 | Murata Mfg Co Ltd | 積層セラミック電子部品、積層セラミック電子部品の製造方法及び内部電極形成用導電ペースト |
JP2004111939A (ja) * | 2002-08-29 | 2004-04-08 | Ngk Insulators Ltd | 積層型圧電素子及びその製造方法 |
JP2004288548A (ja) * | 2003-03-24 | 2004-10-14 | Noritake Co Ltd | 圧電セラミック材用導体ペースト及びその利用 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008085041A (ja) * | 2006-09-27 | 2008-04-10 | Kyocera Corp | 積層セラミックコンデンサおよびその製法 |
CN101872834A (zh) * | 2010-05-20 | 2010-10-27 | 中山大学 | 一种弯曲振动型压电变压器 |
CN101872834B (zh) * | 2010-05-20 | 2014-04-02 | 中山大学 | 一种弯曲振动型压电变压器 |
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