CN100485835C - Inner electrode size of ceramic capacitor and preparation method thereof - Google Patents
Inner electrode size of ceramic capacitor and preparation method thereof Download PDFInfo
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- CN100485835C CN100485835C CN 200610034198 CN200610034198A CN100485835C CN 100485835 C CN100485835 C CN 100485835C CN 200610034198 CN200610034198 CN 200610034198 CN 200610034198 A CN200610034198 A CN 200610034198A CN 100485835 C CN100485835 C CN 100485835C
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Abstract
This invention discloses a method for preparing electrode slurry material in a ceramic condenser including the following steps: dissolving an organic package material in a solvent then adding ceramic powder and NI powder in the solution for ball mill scattering to prepare a scatter solution with ceramic powder and Ni powder, 2, adding bond solution in said scatter solution to be grinded and scattered. This invention also discloses an internal electrode slurry including (wt): Ni powder: 40-60%, ceramic powder: 2.5-15%, bonder: 2-6%, solvent: 30-55% and organic package material: 0.05-1%, in which, the mean size of Ni powder is between 0.2-1.0mum and that of the ceramic powder is between 0.1-0.4mum.
Description
Technical field
The present invention relates to a kind of electrode size that is used for ceramic capacitor and preparation method thereof, more particularly, the present invention relates to a kind ofly be used for multilayer ceramic capacitor (MLCC), have electrode size of temperature-compensating (COG) characteristic and preparation method thereof.
Background technology
The Ni slurry with temperature-compensating (COG) characteristic of multilayer ceramic capacitor is to adopt extra-fine nickel powder and ceramic additive through disperseing and mixing and make, yet the inside of this product easily cracks, thereby causes the deterioration of insulation resistance (IR) and dielectric loss performances such as (DF).This technology belongs to the material processing method technical field
For this reason, a kind of electrocondution slurry for preparing electrode in the ceramic capacitor is disclosed, in the hope of addressing the above problem among Chinese patent CN01122368.5 and the CN01122370.7.Wherein, disclosed electrocondution slurry contains conductive powder, organic carrier, compd A and the compd B of nickel among the Chinese patent CN01122368.5, compd A be selected from calcium and/or magnesium the organic complex salt of metal salts of organic acids, oxide powder, metal or/or at least a material of alkoxide kind, compd B is titaniferous and/or zirconium, have the compound of hydrolyzable reactive group; Disclosed electrocondution slurry of Chinese patent CN01122370.7 and Chinese patent CN01122368.5 are basic identical, but its compd B is to contain compound aluminium and/or silicon, that have hydrolyzable reactive group.And the manufacture craft of these two disclosed electrocondution slurries of patent is identical, be specially: the processing of A, conductive powder, that is: nickel powder+ethanol → ultrasound homogenizer dispersion → interpolation (compd A+compd B) → stirring → interpolation (pure water+ammoniacal liquor) → stirring → separation → drying; B, slurry are made, that is: the conductive powder of handling well+(the organic bond system of having dissolved)+solvent → ball milling mixes and disperses.
Disclosed technology can improve the heat-resisting cataclysm and the moisture resistance load of laminated ceramic electronic unit among Chinese patent CN01122368.5 and the CN01122370.7, but its shortcoming is compd A and compd B all is materials of comparison costliness, especially compd B, the technology controlling and process difficulty limits this class electrocondution slurry greatly in industrial extensive use.
Chinese patent application CN03146862.4 discloses interior electrodes conduct slurry that a kind of chip multilayer ceramic capacitor uses and the ceramic capacitor that makes with this slurry, wherein, electrode size comprises nickel metal powder, ceramic additive and organic carrier, is nickel powder 35-55%, ceramic additive 2-20% and organic carrier 35-65% by weight percentage.The main component of its ceramic layer is BaTiO
3, the manufacture craft of electrode size is directly to carry out three rollers simply after nickel powder, ceramic additive, resin and organic solvent are mixed to grind.Although the technology of this patent application can solve the problem of production cost, manufacture craft is too simple, and prepared slurry dispersiveness is enough not good.Like this, when the ceramic powder addition is higher, and print thickness is when thin, electrode poor continuity, capacity dispersion will occur or not have problems such as capacity, loss height, and when print thickness is thick, just occur problems such as cracking, layering again easily, and the slurry consumption is big, the printing cost height; When the ceramic powder addition was low, interior electrode and pottery shrank and do not match, and occurred problems such as cracking and layering easily, particularly for the product of high power capacity.
For this reason, be necessary to provide that a kind of production cost is cheap relatively, the electrode size of slurry excellent dispersion and preparation method thereof, in the hope of solving the problems referred to above of industry.
Summary of the invention
On the one hand, the invention provides a kind of method that can prepare the ceramic capacitor electrode size with good dispersion, this method comprises the following steps:
(1) the organic lapping with one or more is dissolved in the solution that makes organic lapping in the solvent, in this organic lapping solution, add ceramic powder and nickel powder then and carry out ball milling (sand milling) dispersion, make the dispersion liquid that contains ceramic powder and described nickel powder;
(2) in the dispersion liquid of step (1) gained, add binder solution, carry out Ball milling then.
Wherein, in step (2), binder solution can be once add, gradation adds or add continuously.After binder solution adds, can directly make the electrode size of ceramic capacitor of the present invention through three-high mill.Perhaps, in step (2) just with once, gradation or continuously mode add the part binder solution, after Ball milling, continue to add the binder solution of remainder, the mode that adds also can for once, gradation or add continuously, stir afterwards,, make the electrode size of ceramic capacitor of the present invention again through three-high mill.
In electrode size preparation method of the present invention, it is essential and earlier ceramic powder and nickel powder are carried out Ball milling in organic lapping solution, can before adhesive adds, ceramic powder and Ni powder be separated reunion like this, and mixing, and prevent that the ceramic powder particles or the nickel powder particle that have disperseed from taking place to reunite or agglomeration again; In addition, binder solution is to add after above-mentioned Ball milling is finished again, so that ceramic powder particles and nickel powder particle keep tiny particle diameter and fully disperse.Thereby the electrode size of the present invention's preparation has dispersed well.Organic lapping can be selected from oleic acid, stearic acid, aliphatic acid, erucyl amide, oleamide, stearic amide, polyacrylamide and the ethylene bis stearic acid amide.
In the method for the invention, ceramic powder and nickel powder can add in organic lapping solution basically simultaneously, carry out ball milling then; Also can ceramic powder be added in organic lapping solution earlier, carry out ball milling, behind this ball milling, add nickel powder in the solution of gained then, further carry out ball milling again; Perhaps can add nickel powder earlier carries out ball milling, adds ceramic powder again and carry out ball milling.Preferably, ceramic powder and nickel powder are that substep joins in organic lapping solution and carries out ball milling; More preferably, adding earlier ceramic powder carries out ball milling, adds nickel powder again and carry out ball milling.
In the method for the invention, can also further in organic lapping solution, add dispersant, to improve the Ball milling effect of ceramic powder and nickel powder.Added dispersant can be a unrighted acid, for example peanut oil, soya-bean oil etc. and other anion, non-ionic surface active agent.
On the other hand, the present invention also provides a kind of ceramic capacitor electrode size with good dispersion, and in its total weight, this electrode size comprises:
Nickel powder 40wt%-60wt%
Ceramic powder 2.5wt%-15wt%
Adhesive 2wt%-6wt%
Solvent 30wt%-55wt%
Organic lapping 0.05wt%-1wt%
Wherein, the average grain diameter of nickel powder is between 0.2-1.0 μ m, and the ceramic powder average grain diameter is between 0.1-0.4 μ m.
In above-mentioned electrode size, ceramic powder can be CaZrO
3, (Sr
xCa
1-x) m (Ti
yZr
1-y) O
3, SrZrO
3, BaZrO
3, Sr (Ti
yZr
1-y) O
3, Ba (Ti
yZr
1-y) O
3, Ca (Ti
yZr
1-y) O
3In one or more, wherein, 0≤X≤0.5,0.02≤Y≤0.04,1.001≤m≤1.002.Nickel powder can adopt wherein a kind of method making in CVD (chemical vapor deposition) method, PVD (physical vapor deposition) method, wet type reducing process, the spray-on process, and shape can be approximate spherical particle.
In above-mentioned electrode size, adhesive can be selected from methylcellulose, ethyl cellulose, acrylic resin, PVB (polyvinyl butyral resin), carboxymethyl cellulose, hydroxypropyl methylcellulose, hydroxyethylcellulose and the hydroxypropyl cellulose.
At above-mentioned electrode size, employed solvent is this area organic solvent commonly used, and it can be an esters solvent, as ethyl acetate, butyl acetate, ethylene glycol ether acetate, 2-Butoxyethyl acetate, diethylene glycol monobutyl ether acetate etc.; Also can be alcohols solvent, as hexanol, terpinol etc.; Can also be aromatic hydrocarbon solvent such as phenmethylol etc.; And Mineral spirits etc.Certainly can also be the mixture of above-mentioned solvent.And the solvent that is used for adhesive can be identical with the solvent that is used for organic lapping, also can be different.
On the one hand, the present invention also provides a kind of ceramic capacitor again, and particularly a kind of chip multilayer ceramic capacitor, the interior electrode of this ceramic capacitor are to adopt above-mentioned electrode size to make.
Because the present invention is when preparation ceramic capacitor electrode size, ceramic powder and/or nickel powder are disperseed in advance, and organic parcel, ceramic powder, nickel powder use sand mill to disperse, the molten good back of adhesive substep adds, thereby compared with prior art, electrode size good dispersion of the present invention, ceramic additive be evenly dispersed in nickel powder around, the interior electrode that uses the printing of this slurry shrinks high conformity with the sintering of ceramic dielectric, and the product of production does not have that cracking, layering and IR, DF disperse with capacity repeatedly, the problem of loss rising.
The preparation technology of electrode size of the present invention controls simply, the cost of material is low, be fit to mass production applications, and the COG product that utilizes slurry of the present invention to produce can use electrode in the base metal Ni, the product reliability height, and production cost reduces greatly.
Below in conjunction with embodiment, further specify the present invention, but the present invention is not limited to these embodiment, any on essence spirit of the present invention improvement or substitute, still belong to scope required for protection in claims of the present invention.
Embodiment
Embodiment 1
Prepare electrode size of the present invention by following process:
A, binder solution are made:
Get ethyl cellulose 120g, terpinol 400g, Mineral spirits 200g, 70 ℃ of constant temperature are stirred to dissolving fully.It is stand-by to cool off 1000 mesh sieves.
B, dispersion liquid are made (ceramic powder disperses and organic parcel and nickel powder dispersion in advance):
Get terpinol 300g, Mineral spirits 120g, stearic acid 10g stirs and dissolves fully up to stearic acid, adds 10g peanut oil, 200gCaZrO
3Stirring joins (mill is situated between and is the zirconia ball 9kg of φ 3) in the 5L ball grinder, ball milling 10hr, and speed 90rpm adds nickel powder 900g, ball milling 4 hours, speed 50rpm adds the 60g binder solution, ball milling 10hr./60rpm discharging.
C, slurry are made:
The dispersion liquid that the above-mentioned B step of weighing makes, the ratio in 3/17 adds binder solution, high-speed stirred 1500rpm/20min discharging, three-high mill passes through for 5 times.
Comparative Examples 1
Get material and proportioning among the embodiment 1: 900gNi powder, 200gCaZrO
3, 10g peanut oil, terpinol 490g, Mineral spirits 215g and ethyl cellulose 57g, according to the technology slurrying of prior art: above-mentioned material is mixed, cross milling train and pass through for 5 times.
Comparative Examples 2
Get material and proportioning among the embodiment 1: 900gNi powder, 200gCaZrO
3, 10g peanut oil
,Terpinol 490g, Mineral spirits 215g and ethyl cellulose 57g, according to the technology slurrying of prior art: Ball milling 24hr, 5L ball grinder 60rpm, mill are situated between and are the zirconia ball 9kg of φ 3.
The electrode size that embodiment 1 and Comparative Examples 1, Comparative Examples 2 make is analyzed: nickel slurry assay sees Table 1, as seen from Table 1, and the F.O.G of electrode size of the present invention≤1.5 μ m, no coarse granule.
Table 1
| Embodiment 1 | Comparative Examples 1 | Comparative Examples 2 | Inspection machine | |
| F.O.G(μm) | 1.0 | 3.0 | 2.5 | The fineness drawdown bar |
| The coarse granule number is (individual/cm 2) | 0 | 9 | 6 | Petrographic microscope |
Utilize embodiment 1, Comparative Examples 1 and Comparative Examples 2 prepared electrode sizes to make electrodes in base metal (BME) COG ceramic capacitor, and these capacitors are tested, result of the test sees Table 2.From the result of table 2 as can be seen, the capacitor that utilizes electrode size of the present invention to make, in its capacity set, DPA analyzes does not have cracking, and no IR, DF are repeatedly.
Table 2
Embodiment 2-7
Press method same among the embodiment 1 and material preparation electrode size, just material mixture ratio changes to some extent, and wherein, material prescription sees Table 3, and the slurry assay sees Table 4.
Comparative Examples 3-4
By same method and material preparation electrode size in the Comparative Examples 1, just material mixture ratio changes to some extent, and wherein, material prescription sees Table 3, and the slurry assay sees Table 4
Table 3
| Material | The Ni powder | CaZr03 | Stearic acid | Peanut oil | Terpinol | Mineral spirits | Ethyl cellulose |
| Embodiment 2 | 900 | 200 | 10 | 0 | 490 | 215 | 57 |
| Embodiment 3 | 1050 | 50 | 10 | 10 | 490 | 215 | 57 |
| Embodiment 4 | 850 | 250 | 10 | 10 | 490 | 215 | 57 |
| Embodiment 5 | 736 | 164 | 10 | 10 | 629 | 276 | 120 |
| Embodiment 6 | 900 | 200 | 1 | 0 | 490 | 215 | 57 |
| Embodiment 7 | 900 | 200 | 18 | 0 | 490 | 215 | 57 |
| Comparative Examples 3 | 1100 | 0 | 10 | 10 | 490 | 215 | 57 |
| Comparative Examples 4 | 700 | 300 | 10 | 10 | 490 | 215 | 57 |
Table 4
| Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 | Comparative Examples 3 | Comparative Examples 4 | Inspection machine | |
| F.O.G (μm) | 1.1 | 0.9 | 1.1 | 1.0 | 1.2 | 1.0 | 0.9 | 1.1 | The fineness drawdown bar |
| The coarse granule number is (individual/cm 2) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Petrographic microscope |
Utilize the prepared electrode size of embodiment 2-7, Comparative Examples 3-4 to make electrodes in base metal (BME) COG ceramic capacitor (0805COG102J50V product), and these capacitors are tested, result of the test sees Table 5.The result of table 5 can further confirm, the capacitor that utilizes electrode size of the present invention to make, and in its capacity set, DPA analyzes does not have cracking, and no IR, DF are repeatedly.
Table 5
Claims (9)
1, a kind of method for preparing the ceramic capacitor electrode size, this method comprises the following steps:
(1) organic lapping is dissolved in the solution that makes organic lapping in the solvent, adding ceramic powder and nickel powder carry out Ball milling in this organic lapping solution then, make the dispersion liquid that contains described ceramic powder and described nickel powder; Wherein, described organic lapping is selected from oleic acid, stearic acid, aliphatic acid, erucyl amide, oleamide, stearic amide, polyacrylamide and the ethylene bis stearic acid amide;
(2) in the dispersion liquid of step (1) gained, add binder solution, carry out Ball milling then.
2, the method for claim 1 is characterized in that, also further comprises step (3) afterwards in step (2):
(3) in the slurries of step (2) gained, continue to add binder solution, stir, promptly make the electrode size of ceramic capacitor through three-high mill.
3, the method for claim 1 is characterized in that, in step (1), described ceramic powder and described nickel powder add in described organic lapping solution simultaneously, carry out ball milling then.
4, the method for claim 1 is characterized in that, in step (1), earlier described ceramic powder is added in described organic lapping solution, carries out ball milling; Behind this ball milling, add described nickel powder then in the solution of gained, further carry out ball milling again; Perhaps add described nickel powder earlier and carry out ball milling, add described ceramic powder again and carry out ball milling.
5, as the described method of one of claim 1-4, it is characterized in that, in step (1), also further in described organic lapping solution, add dispersant, to improve the Ball milling effect of described ceramic powder and described nickel powder.
6, a kind ofly prepare the electrode size that ceramic capacitor is used, in the total weight of this electrode size, this electrode size comprises:
Nickel powder 40wt%-60wt%
Ceramic powder 2.5wt%-15wt%
Adhesive 2wt%-6wt%
Solvent 30wt%-55wt%
Organic lapping 0.05wt%-1wt%
Wherein, the average grain diameter of described nickel powder is between 0.2-1.0 μ m, described ceramic powder average grain diameter is between 0.1-0.4 μ m, and described organic lapping is selected from oleic acid, stearic acid, aliphatic acid, erucyl amide, oleamide, stearic amide, polyacrylamide and the ethylene bis stearic acid amide.
7, electrode size as claimed in claim 6 is characterized in that, described ceramic powder is CaZrO
3, (Sr
xCa
1-x) m (Ti
yZr
1-y) O
3, SrZrO
3, BaZrO
3, Sr (Ti
yZr
1-y) O
3, Ba (Ti
yZr
1-y) O
3, Ca (Ti
yZr
1-y) O
3In one or more, wherein, 0≤X≤0.5,0.02≤Y≤0.04,1.001≤m≤1.002.
8, electrode size as claimed in claim 6, it is characterized in that described adhesive is selected from methylcellulose, ethyl cellulose, acrylic resin, polyvinyl butyral resin, carboxymethyl cellulose, hydroxypropyl methylcellulose, hydroxyethylcellulose and the hydroxypropyl cellulose.
9, a kind of ceramic capacitor is characterized in that, the interior electrode of this ceramic capacitor adopts and makes as the described electrode size of one of claim 6-8.
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|---|---|---|---|
| CN 200610034198 CN100485835C (en) | 2006-03-10 | 2006-03-10 | Inner electrode size of ceramic capacitor and preparation method thereof |
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| CN100485835C true CN100485835C (en) | 2009-05-06 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522209B (en) * | 2011-09-30 | 2013-09-25 | 天津国泰之光新材料技术研究院有限公司 | Preparation method of cathode negative plate slurry of high-energy nickel-carbon supercapacitor |
| JP6613551B2 (en) * | 2014-07-31 | 2019-12-04 | 住友金属鉱山株式会社 | Multilayer ceramic capacitor internal electrode paste and multilayer ceramic capacitor |
| CN104332250A (en) * | 2014-10-09 | 2015-02-04 | 中国船舶重工集团公司第七一二研究所 | Preparation method for electrode silver palladium slurry in laminated piezoelectric ceramic loudspeaker |
| US10392535B2 (en) * | 2015-07-22 | 2019-08-27 | Shoei Chemical Inc. | Binder resin for inorganic particle-dispersed pastes and inorganic particle-dispersed paste |
| KR102238769B1 (en) * | 2018-04-23 | 2021-04-09 | 삼성에스디아이 주식회사 | Composition for forming electrode, electrode manufactured using the same and solar cell |
| CN110379570B (en) * | 2019-08-09 | 2020-12-08 | 大连海外华昇电子科技有限公司 | Manufacturing process and application of nickel slurry for multilayer ceramic capacitor |
| CN110648781B (en) * | 2019-09-10 | 2021-07-16 | 广州市儒兴科技开发有限公司 | Main grid front silver paste suitable for step-by-step screen printing |
| CN111627698B (en) * | 2020-06-08 | 2022-05-17 | 江苏国瓷泓源光电科技有限公司 | Nickel inner electrode slurry for MLCC |
| CN111627699B (en) * | 2020-06-08 | 2022-03-18 | 江苏国瓷泓源光电科技有限公司 | Manufacturing process of high-dispersity inner electrode slurry for MLCC |
| CN113410050B (en) * | 2021-05-27 | 2022-07-22 | 潮州三环（集团）股份有限公司 | Nickel electrode composition and preparation method and application thereof |
| CN114694898B (en) * | 2022-06-01 | 2022-10-14 | 西北工业大学 | Preparation method of MLCC nickel inner electrode slurry |
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