CN114694955A - Ceramic slurry for filter capacitor, preparation method of filter capacitor and filter capacitor - Google Patents
Ceramic slurry for filter capacitor, preparation method of filter capacitor and filter capacitor Download PDFInfo
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- CN114694955A CN114694955A CN202011618030.0A CN202011618030A CN114694955A CN 114694955 A CN114694955 A CN 114694955A CN 202011618030 A CN202011618030 A CN 202011618030A CN 114694955 A CN114694955 A CN 114694955A
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- 239000000919 ceramic Substances 0.000 title claims abstract description 112
- 239000003990 capacitor Substances 0.000 title claims abstract description 65
- 239000002002 slurry Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000005245 sintering Methods 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 13
- 239000012528 membrane Substances 0.000 claims abstract description 11
- 239000002270 dispersing agent Substances 0.000 claims abstract description 10
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 8
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 8
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 8
- 239000004014 plasticizer Substances 0.000 claims abstract description 8
- 238000007639 printing Methods 0.000 claims description 16
- 239000000758 substrate Substances 0.000 claims description 14
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 12
- 238000010304 firing Methods 0.000 claims description 12
- 239000003292 glue Substances 0.000 claims description 12
- 229910052709 silver Inorganic materials 0.000 claims description 12
- 239000004332 silver Substances 0.000 claims description 12
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 7
- 239000011267 electrode slurry Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000007650 screen-printing Methods 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 6
- 239000003973 paint Substances 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 239000011787 zinc oxide Substances 0.000 claims description 4
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 claims description 3
- 229910002113 barium titanate Inorganic materials 0.000 claims description 3
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical group CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims description 3
- 229910000416 bismuth oxide Inorganic materials 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229910000428 cobalt oxide Inorganic materials 0.000 claims description 3
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 claims description 3
- 239000013530 defoamer Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 claims description 3
- 238000007598 dipping method Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 3
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 3
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000002003 electrode paste Substances 0.000 claims description 2
- 239000002966 varnish Substances 0.000 claims 1
- 239000013078 crystal Substances 0.000 abstract description 8
- 239000011159 matrix material Substances 0.000 abstract description 5
- 239000000654 additive Substances 0.000 abstract description 3
- 230000000996 additive effect Effects 0.000 abstract description 3
- 239000007767 bonding agent Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Inorganic materials O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
- H01G4/1218—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates
- H01G4/1227—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates based on alkaline earth titanates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/38—Multiple capacitors, i.e. structural combinations of fixed capacitors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Ceramic Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The invention provides a ceramic slurry for a filter capacitor, a preparation method of the filter capacitor and the filter capacitor, wherein the ceramic slurry is added with a certain amount of metal oxide on the basis of the existing ceramic powder, so that the crystal boundary thickness of a prepared ceramic membrane is increased, a ferroelectric phase is diluted, the insulating degree of crystal grains is improved, and meanwhile, the sintering can be promoted by adding additive components such as a dispersing agent, a plasticizer, a bonding agent, a defoaming agent and the like, so that the density of a ceramic matrix is improved, and the electrical property of a device is improved; the filter capacitor and the preparation method thereof both adopt the ceramic slurry, so that the prepared filter capacitor has the advantages of high capacitance, high resistance to edge resistance and the like.
Description
Technical Field
The invention relates to the technical field of filter capacitor preparation, in particular to a ceramic slurry for a filter capacitor, a preparation method of the filter capacitor and the filter capacitor.
Background
With the rapid development of electronic products and the increasingly complex electromagnetic interference environment, various anti-electromagnetic interference devices are of great importance. Generally, the suppression effect of the filter capacitor on the electromagnetic interference mainly depends on the capacitance, the larger the capacitance, the better the corresponding electromagnetic interference effect, and the capacitance is inversely proportional to the thickness, therefore, if a capacitor with strong electromagnetic interference resistance is obtained, the thickness of the capacitor must be reduced, but the mechanical strength of the capacitor is affected after the thickness is reduced.
The traditional filter capacitor mostly adopts a tubular capacitor, the tubular capacitor is generally of a single-layer ceramic structure, the thickness of a ceramic tube is generally 0.3mm, the thickness of the tubular capacitor is the root place which restricts the improvement of the capacitance, however, the problem of electromagnetic interference is serious day by day, and the tubular capacitor filter can not meet the market demand day by day. The ceramic plate type array capacitor adopts a plate type laminated structure, the thickness of a single layer can reach 0.05mm, and the whole thickness of the laminated ceramic plate can reach 3mm, so that the requirement of large capacity of an anti-electromagnetic interference filter is met, and the whole mechanical strength of the ceramic plate is ensured. However, the ceramic plate type array filter capacitor is a multilayer plate structure with a plurality of signal holes, and the signal holes are added in the middle of the complete monolithic structure, so that the overlapping area of electrodes is reduced, and further, the capacitance and the insulation resistance are reduced.
Therefore, how to increase the capacitance and insulation resistance of the ceramic plate array filter capacitor is a problem to be solved.
Disclosure of Invention
In view of this, the invention provides a ceramic slurry for a filter capacitor, a method for manufacturing the filter capacitor, and the filter capacitor, so as to improve the capacitance and the edge resistance of the filter capacitor.
In one aspect, the invention provides a ceramic slurry for a filter capacitor, which comprises the following components in percentage by weight: 15 to 25 percent of solvent, 0.01 to 0.05 percent of dispersant, 0.01 to 0.05 percent of plasticizer, 15 to 25 percent of adhesive, 0.01 to 0.05 percent of defoaming agent and the balance of composite ceramic powder;
the composite ceramic powder is made of BaTiO3Ceramic powder and metal oxide added with 15 to 25 percent of mole percentage;
the metal oxide is: one or more of calcium oxide, neodymium oxide, cerium oxide, cobalt oxide, nickel oxide, bismuth oxide, and zinc oxide.
Preferably, the dispersant is a 2050 dispersant.
Further preferably, the plasticizer is dioctyl phthalate.
Further preferably, the defoamer is an FP330 defoamer.
On the other hand, the invention also provides a preparation method of the filter capacitor, wherein the filter capacitor is a ceramic plate type array filter capacitor, and the preparation method comprises the following steps:
1) coating ceramic slurry on a membrane strip through a casting equipment grouting opening, forming a uniform slurry layer on the membrane strip, and drying to form a ceramic membrane, wherein the ceramic slurry is the ceramic slurry in any one of claims 1 to 4;
2) printing internal electrodes on the ceramic diaphragm, and laminating the printed ceramic diaphragms to form a bar block, wherein the internal electrodes of the ceramic diaphragms in the bar block are opposite to each other;
3) carrying out isothermal static pressing on the blocks under the condition of 15-30 Mpa, and processing the blocks subjected to isothermal static pressing into ceramic blanks with designed shapes and sizes;
4) carrying out glue removal and high-temperature sintering on the ceramic blank;
5) processing inner holes penetrating through the upper surface and the lower surface of the ceramic blank after glue removal and high-temperature sintering according to design, and printing electrode slurry on the inner holes and the peripheral side wall of the ceramic blank;
6) and (3) carrying out silver firing on the ceramic blank coated with the electrode slurry, and carrying out printing insulating paint treatment on the ceramic blank subjected to silver firing to obtain a finished product.
Preferably, in the step 4), the glue discharging temperature is as follows: the temperature is 150-650 ℃, and the time for removing the glue and preserving the heat is 2-3 h; the sintering temperature is as follows: 1070 to 1150 ℃ and the sintering heat preservation time is 1 to 3 hours.
Further preferably, in the step 6), the temperature of silver firing is 550-960 ℃, and the heat preservation time of silver firing is 0.5-1.5 h.
Further preferably, the inner electrode printing in the step 2) and the insulating paint printing in the step 6) are all printed by adopting a full-automatic screen printing mode.
Further preferably, the electrode paste is printed in the step 5) by combining manual dipping and full-automatic screen printing.
In addition, the invention also provides a ceramic plate type array filter capacitor, which is prepared by any one of the preparation methods and consists of a ceramic substrate, a signal electrode leading-out end and a grounding electrode leading-out end;
the metal electrode layer number is 3-30, and the metal electrode layer number is co-fired in the ceramic substrate, and the signal electrode leading-out end is located on the surface of the inner hole of the ceramic substrate, and the grounding electrode leading-out end is located on the peripheral surface of the ceramic substrate.
According to the ceramic slurry for the filter capacitor, a certain amount of metal oxide is added on the basis of the existing ceramic powder, so that the grain boundary thickness of the prepared ceramic membrane is increased, the ferroelectric phase is diluted, the insulating degree of crystal grains is improved, meanwhile, the additive components such as a dispersing agent, a plasticizer, a bonding agent and a defoaming agent are added, the sintering can be promoted, the density of a ceramic matrix is improved, and the electrical performance of a device is improved.
According to the filter capacitor and the preparation method thereof, the ceramic slurry is adopted, so that the prepared filter capacitor has the advantages of high capacitance, high resistance to edge resistance and the like.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a ceramic plate array filter capacitor according to an embodiment of the disclosure;
FIG. 2 is a top view of a ceramic plate array filter capacitor according to an embodiment of the disclosure;
fig. 3 is a cross-sectional view taken along a-a of fig. 2.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
In order to improve the capacitance and the insulation resistance of the ceramic plate array filter capacitor, the present embodiment studies the ceramic substrate in the ceramic plate array filter capacitor, and the ceramic substrate is composed of various constituent phases, for example: the crystal phase, the glass phase, the gas phase, etc., and their shape, size, number and distribution, grain boundary width and their relationship affect the electrical properties of the ceramic matrix. The main performance of the electronic ceramic product is determined by the main crystal phase, the glass phase is distributed around the crystal grains and has influence on the electrical performance of the ceramic matrix, and the glass phase is mainly obtained by adding additive components into the electronic ceramic powder.
The novel ceramic slurry for preparing the capacitor provided by the embodiment comprises the following components in percentage by weight: 15 to 25 percent of solvent, 0.01 to 0.05 percent of dispersant, 0.01 to 0.05 percent of plasticizer, 15 to 25 percent of adhesive, 0.01 to 0.05 percent of defoaming agent and the balance of composite ceramic powder;
the composite ceramic powder is made of BaTiO3Ceramic powder and metal oxide added with 15 to 25 percent of mole percentage;
the metal oxide is: one or more of calcium oxide, neodymium oxide, cerium oxide, cobalt oxide, nickel oxide, bismuth oxide, and zinc oxide.
Wherein, the solvent can be absolute ethyl alcohol, the dispersing agent can be 2050, the plasticizer can be dioctyl phthalate, the adhesive can be acrylic resin, and the defoaming agent is FP330 defoaming agent.
In the ceramic slurry, because of the addition of oxides such as calcium, bismuth and the like, the thickness of a crystal boundary is increased, a ferroelectric phase is diluted, and the insulating degree of crystal grains is improved; the oxides of cobalt, nickel and the like promote sintering to improve the density of the ceramic matrix and improve the electrical property of the device.
The embodiment also provides a preparation method of the filter capacitor, the filter capacitor is a ceramic plate type array filter capacitor, and the preparation method comprises the following steps:
1) coating ceramic slurry on a membrane strip through a casting equipment grouting opening, forming a uniform slurry layer on the membrane strip, and drying to form a ceramic membrane, wherein the ceramic slurry is the ceramic slurry;
2) printing internal electrodes on the ceramic diaphragm, and laminating the printed ceramic diaphragms to form a bar block, wherein the internal electrodes of the ceramic diaphragms in the bar block are opposite to each other;
3) carrying out isothermal static pressing on the blocks under the condition of 15-30 Mpa, and processing the blocks subjected to isothermal static pressing into ceramic blanks with designed shapes and sizes;
4) carrying out glue removal and high-temperature sintering on the ceramic blank;
5) processing inner holes penetrating through the upper surface and the lower surface of the ceramic blank after glue removal and high-temperature sintering according to design, and printing electrode slurry on the inner holes and the peripheral side wall of the ceramic blank, wherein 1 represents an inner hole, and 2 represents a peripheral side wall, referring to fig. 1-3;
6) and (3) carrying out silver firing on the ceramic blank coated with the electrode slurry, and carrying out printing insulating paint treatment on the ceramic blank subjected to silver firing to obtain a finished product.
Wherein, in the step 4), the glue discharging temperature is as follows: the temperature is 150-650 ℃, and the time for removing the glue and preserving the heat is 2-3 h; the sintering temperature is as follows: sintering and keeping the temperature for 1-3 h at 1070-1150 ℃; in the step 6), the temperature of silver firing is 550-960 ℃, and the heat preservation time of silver firing is 0.5-1.5 h.
Printing the inner electrode in the step 2) and the insulating paint in the step 6) by adopting a full-automatic screen printing mode so as to accelerate the printing progress; and 5) printing the electrode slurry in the step 5) by adopting a mode of combining manual dipping and full-automatic screen printing.
The embodiment provides a ceramic plate type array filter capacitor, which is prepared by the method and consists of a ceramic substrate, a signal electrode leading-out end and a grounding electrode leading-out end;
the metal electrode layer number is 3-30, and the metal electrode layer number is co-fired in the ceramic substrate, and the signal electrode leading-out end is located on the surface of the inner hole of the ceramic substrate, and the grounding electrode leading-out end is located on the peripheral surface of the ceramic substrate.
The invention is further explained below with reference to specific embodiments, but is not intended to limit the scope of the invention.
The preparation method of the ceramic plate type array filter capacitor is obtained according to the method provided by the embodiment, the components of the ceramic slurry adopted in each example are different, and the specific components are shown in tables 1 and 2.
Table 1: mass percent
The composition of the ceramic composite powder is shown in Table 2.
Table 2: mole percent of
The performance of the ceramic plate array filter capacitor prepared in the above examples 1 to 5 was tested, and is specifically shown in table 3.
Table 3:
| serial number | Capacitance C (pF) | Dielectric pressure-resistant UR(V) | Insulation resistance Rj(MΩ) |
| Example 1 | 6563 | 600 | 50000 |
| Example 2 | 6006 | 600 | 55000 |
| Example 3 | 6438 | 600 | 50000 |
| Example 4 | 6782 | 600 | 50000 |
| Example 5 | 5962 | 600 | 45000 |
| Example 6 | 6362 | 600 | 50000 |
| Example 7 | 6789 | 600 | 55000 |
Adopting BaTiO in the prior scheme3-Nb2O5And (3) taking a ZnO basic formula system as ceramic slurry, preparing 5 ceramic plate type array filter capacitors by adopting the preparation method, and carrying out performance detection on the capacitors, wherein the concrete steps are shown in Table 4.
Table 4:
| serial number | Capacitance C (pF) | Dielectric pressure-resistant UR(V) | Insulation resistance Rj(MΩ) |
| Comparative example 1 | 5000 | 600 | 40000 |
| Comparative example 2 | 4500 | 600 | 45000 |
| Comparative example 3 | 5659 | 600 | 40000 |
| Comparative example 4 | 5912 | 600 | 40000 |
| Comparative example 5 | 5136 | 600 | 45000 |
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that the present invention is not limited to what has been described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. The ceramic slurry for the filter capacitor is characterized by comprising the following components in percentage by weight: 15 to 25 percent of solvent, 0.01 to 0.05 percent of dispersant, 0.01 to 0.05 percent of plasticizer, 15 to 25 percent of adhesive, 0.01 to 0.05 percent of defoamer and the balance of composite ceramic powder;
the composite ceramic powder is made of BaTiO3Ceramic powder and metal oxide with the added mole percentage of 15 percent to 25 percent;
the metal oxide is: one or more of calcium oxide, neodymium oxide, cerium oxide, cobalt oxide, nickel oxide, bismuth oxide, and zinc oxide.
2. The ceramic slurry for filter capacitors as claimed in claim 1, wherein said dispersant is 2050 dispersant.
3. The ceramic slurry for filter capacitors as claimed in claim 1, wherein said plasticizer is dioctyl phthalate.
4. The ceramic slurry for filter capacitors as claimed in claim 1, wherein said defoaming agent is FP330 defoaming agent.
5. A preparation method of a filter capacitor, wherein the filter capacitor is a ceramic plate type array filter capacitor, and is characterized by comprising the following steps:
1) coating ceramic slurry on a membrane strip through a casting equipment grouting opening, forming a uniform slurry layer on the membrane strip, and drying to form a ceramic membrane, wherein the ceramic slurry is the ceramic slurry in any one of claims 1 to 4;
2) printing internal electrodes on the ceramic diaphragm, and laminating the printed ceramic diaphragms to form a bar block, wherein the internal electrodes of the ceramic diaphragms in the bar block are opposite to each other;
3) carrying out isothermal static pressing on the blocks under the condition of 15-30 Mpa, and processing the blocks subjected to isothermal static pressing into ceramic blanks with designed shapes and sizes;
4) carrying out glue removal and high-temperature sintering on the ceramic blank;
5) processing inner holes penetrating through the upper surface and the lower surface of the ceramic blank after glue removal and high-temperature sintering according to design, and printing electrode slurry on the inner holes and the peripheral side wall of the ceramic blank;
6) and (3) carrying out silver firing on the ceramic blank coated with the electrode slurry, and carrying out printing insulating paint treatment on the ceramic blank subjected to silver firing to obtain a finished product.
6. The method for manufacturing a filter capacitor as claimed in claim 5, wherein in the step 4), the glue discharging temperature is: the temperature is 150-650 ℃, and the time for removing the glue and preserving the heat is 2-3 h; the sintering temperature is as follows: 1070 to 1150 ℃ and the sintering heat preservation time is 1 to 3 hours.
7. The preparation method of the filter capacitor as claimed in claim 5, wherein in the step 6), the temperature of silver firing is 550-960 ℃, and the holding time of silver firing is 0.5-1.5 h.
8. The method for manufacturing a filter capacitor according to claim 5, wherein the printing of the internal electrodes in step 2) and the printing of the insulating varnish in step 6) are performed by full-automatic screen printing.
9. The method for preparing the filter capacitor as claimed in claim 5, wherein the electrode paste is printed in step 5) by combining manual dipping and full-automatic screen printing.
10. A ceramic plate type array filter capacitor is characterized in that the capacitor is prepared by the preparation method of any one of claims 5-9 and consists of a ceramic substrate, a signal electrode leading-out end and a grounding electrode leading-out end;
the metal electrode layer number is 3-30, and the metal electrode layer number is co-fired in the ceramic substrate, and the signal electrode leading-out end is located on the surface of the inner hole of the ceramic substrate, and the grounding electrode leading-out end is located on the peripheral surface of the ceramic substrate.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101145446A (en) * | 2006-09-13 | 2008-03-19 | 北京七星飞行电子有限公司 | Porous plate type array structure ceramic capacitor filter preparation method |
| US20160225527A1 (en) * | 2013-11-18 | 2016-08-04 | Murata Manufacturing Co., Ltd. | Laminated semiconductor ceramic capacitor with varistor function and method for manufacturing the same |
| CN105869887A (en) * | 2016-03-29 | 2016-08-17 | 武汉理工大学 | X9R high-temperature stable multi-layered ceramic capacitor ceramic paste and device manufacturing method therefor |
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