CN107840654A - A kind of dielectric material for ceramic capacitor and preparation method thereof - Google Patents

A kind of dielectric material for ceramic capacitor and preparation method thereof Download PDF

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Publication number
CN107840654A
CN107840654A CN201710955223.7A CN201710955223A CN107840654A CN 107840654 A CN107840654 A CN 107840654A CN 201710955223 A CN201710955223 A CN 201710955223A CN 107840654 A CN107840654 A CN 107840654A
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raw material
dielectric
barium titanate
ceramic capacitor
dielectric material
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张兵
李熙祥
李熙碩
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Shandong Sinocera Functional Material Co Ltd
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Shandong Sinocera Functional Material Co Ltd
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Abstract

A kind of dielectric material for ceramic capacitor provided by the invention and preparation method thereof, the dielectric material includes：The barium titanate of 98 105 molar parts, the raw material A of 0.5 2.5 molar parts, the raw material B of 0.2 0.8 molar parts, the raw material C of 0.1 0.5 molar parts, the raw material D of the 0.2 0.8 molar parts and raw material E of 0.2 1.0 molar parts, wherein A is selected from Ho, Yb, Gd, Dy, the oxide of at least one of Sm and Y element, B is selected from W, Mo, the oxide of at least one of V elements, C is selected from Mn, Cr, the oxide of at least one of Co elements, D is selected from Mg, Ca, the carbonate of at least one of Ba elements, E is selected from Si, Li, the oxide of at least one of Al and B element.The preparation method can make raw material be uniformly distributed in the surface of barium titanate by the way of raw material and barium titanate add by several times.Dielectric material for ceramic capacitor of the present invention and preparation method thereof, the particle size of the dielectric material is small, and the MLCC of making has high reliability.

Description

A kind of dielectric material for ceramic capacitor and preparation method thereof
Technical field
The present invention relates to capacitance material, more particularly, to a kind of dielectric material for ceramic capacitor and its preparation Method.
Background technology
Multiple-layer sheet ceramic capacitor (Multilayer Ceramic Capacitors) abbreviation MLCC, is by printed electricity The ceramic dielectric diaphragm of pole is superimposed together in a manner of misplacing, and ceramic chip is formed by high temperature sintering, then in ceramic chip Seal up metal level and formed in both ends.It has the characteristics that Fabrication of High Specific Capacitance, high reliability, high withstand voltage, frequency characteristic are good, is in e-mail Breath, computer, automatically control and the field such as communicate and apply quite varied electronic device.
With electronic equipment and component develop to directions such as miniature, thin layer, hybrid integrateds and integrated circuit surface peace Dress technology develops rapidly, growing day by day to high-performance MLCC demand.MLCC medium thickness in monolayer is constantly thin layer, it is desirable to Even if the thin layer reliability that can also maintain capacitor；Particularly it is less than 2 μm in thickness of dielectric layers and is even less than 0.5 μm super Thin MLCC, it is desirable to which capacitor extreme high reliability, this for preparing the dielectric material of capacitor to proposing higher want Ask.
For example, Publication No. CN101781115A Chinese patent application, it discloses a kind of X8R types multi-layer ceramic capacitance Device dielectric material and preparation method.The principal component of the dielectric material is barium titanate, and its molar content is 92%~96%；By Nb2O3 With Co3O4The soluble solids of composition, R1 oxide, R2 oxide and Bi2O3The additive of composition, its molar content be 4%~ 8%；R1 and R2 is rare earth element.
The temperature stability of the dielectric material is good, dielectric constant is higher, also, has preferable reliability.But due to The size of dielectric material is larger, it is difficult to meets thin layer, Large Copacity the demand of ceramic capacitor.
The content of the invention
The present invention, which provides, a kind of overcomes above mentioned problem or what is solved the above problems at least in part is used for ceramic capacitor Dielectric material and preparation method thereof, to solve, dielectric material particle size is big, is difficult to meet to make thin layer and high reliability MLCC technical problem.
According to an aspect of the present invention, there is provided a kind of dielectric material for ceramic capacitor, it include barium titanate and Raw material A, B, C, D and E.
Wherein, the oxide of at least one of raw material A Ho, Yb, Gd, Dy, Sm and Y elements；Raw material B is W, Mo and V At least one of element oxide；Raw material C is the oxide of at least one of Mn, Cr and Co element；Raw material D be Mg, The carbonate of at least one of Ca and Ba element；Raw material E is the oxide of at least one of Si, Li, AL and B element.
In another specific embodiment, the molar part content of each component is as follows in the dielectric material：98-105 parts Barium titanate, the raw material A of 0.5-2.5 parts, 0.2-0.8 parts raw material B, 0.1-0.5 part raw material C, 0.2-0.8 part raw material D With the raw material E of 0.2-1.0 parts.
Can be preferably：It is preferred that 100 parts of barium titanate, the raw material A of 1-1.5 parts, raw material B, 0.2-0.3 of 0.3-0.6 parts The raw material E of raw material D and 0.5-0.8 part of raw material C, 0.5-0.7 part of part.
Specifically, dielectric material includes each component of aforementioned proportion, can realize the good dielectric properties of dielectric material, again The growth of particle can effectively be suppressed.
Raw material A content is very few, and resistance to reduction and life characteristic are poor；Content is excessive, and sintering character deteriorates, and dielectric constant is low. Raw material C content is very few, it is impossible to obtains sufficient effect；Content is excessive, is unfavorable for capacity temperature characteristic.Raw material B and D content are protected Hold in suitable scope, can effectively improve the resistance to pressure and capacity temperature characteristic of material, avoid the occurrence of insulaion resistance conduction Performance is bad or the problem of dielectric constant is too low.Raw material E is sintering aid, and its content is very few, and sintering characteristic deteriorates, and is unfavorable for absolutely Edge resistance；Content is excessive, causes burning, can cause the decline of dielectric constant.
In another specific embodiment, raw material A Ho2O3、Yb2O3、Gd2O3、Dy2O3、Sm2O3And Y2O3In one kind It is or a variety of；Preferably Dy2O3And/or Y2O3.Specifically, Y2O3For both sexes additive, the ratio of A positions and B positions can be balanced.And Dy2O3Resistance to reduction significant effect.
In another specific embodiment, raw material B is WO3、MoO3And V2O5In one or more；Preferably V2O5。
In another specific embodiment, raw material C is Mn3O4、Cr2O3And Co2O3In one or more；Preferably Mn3O4And/or Cr2O3。
In another specific embodiment, raw material D is MgCO3、CaCO3And BaCO3In one or more；Preferably MgCO3And CaCO3。
In another specific embodiment, raw material E is SiO2、Li2O、Al2O3And B2O3In one or more；It is preferred that For SiO2And/or Al2O3。
In another specific embodiment, with the barium titanate of hydro-thermal method preparation, its particle size is smaller, generally in 20- 80nm.Particle size is small and the barium titanate of uniform particle sizes can be advantageous to reduce the particle size of dielectric material, improve medium material The particle uniformity of material.
In another specific embodiment, the particle size of barium titanate is preferably 40-60nm.
According to another aspect of the present invention, a kind of preparation method of ceramic capacitor dielectric material is also provided, including：
Step S1, the specification requirement based on the ceramic capacitor, by raw material A, raw material B, raw material C, raw material D and barium titanate After gradation wet type dispersion mixing, dispersion is obtained；
Step S2, calcination processing is carried out after described dispersion drying process and obtains calcining material, the calcining material and raw material E After mixing, then disperse through wet type successively and obtain the dielectric material after drying process.
Specifically, the mode mixed by several times to raw material A, raw material B, raw material C, raw material D and barium titanate can have a variety of.
Specifically, this five classes material of raw material A, raw material B, raw material C, raw material D and barium titanate will can be mixed according to different Order mixing is closed, and uses wet type decentralized processing, this five classes material is sufficiently mixed uniformly, obtains dispersion.
Specifically, after processing being dried to the dispersion, the siccative of gained is calcined.What is obtained after calcining forges Imitation frosted glass and raw material E wet type dispersion mixings, then through drying process, that is, obtain dielectric material.Calcining material is disperseed with raw material E using wet type Processing, to be well mixed, raw material E can be made uniformly to be distributed in the periphery of calcining material, the dielectric material of gained is subsequently being made When making ceramic capacitor, its sintering character can not only be improved, additionally it is possible to avoid because raw material E is in the enrichment of regional area, so that Improve the reliability of dielectric material and ceramic capacitor.
In another specific embodiment, gradation wet type dispersion mixing described in step S1 specifically includes：
Step S11, by more than any two classes or two classes in the raw material A, raw material B, raw material C, raw material D and barium titanate After material wet type dispersion mixing, the first mixture is obtained through drying, calcination processing；
Step S12, in described raw material A, raw material B, raw material C, raw material D and barium titanate with the first mixture variety classes Material in one kind or multiclass material again with after the first mixture wet type dispersion mixing, through drying, calcination processing, obtaining Second mixture；Until raw material A, raw material B, raw material C, raw material D and barium titanate are well mixed, the dispersion is obtained.
Specifically, can be first by any type in raw material A, raw material B, raw material C, raw material D and barium titanate, two classes, three classes Material or four class wet type dispersion mixings, after drying, calcination processing, sequentially add remaining other four classes, three in additive Class, two classes or a kind of material, continue wet type decentralized processing, and dry, calcination processing.
For example, first by raw material A and raw material B wet type dispersion mixings, and the first mixture is obtained after drying, calcination processing； First mixture with raw material C wet type dispersion mixings, after drying, calcination processing, obtains the second mixture again；Second mixture is again With raw material D and barium titanate wet type dispersion mixing, dispersion is obtained.
For another example first by raw material A, raw material B and raw material D wet type dispersion mixings, and obtain first after drying, calcination processing Mixture；First mixture with raw material C wet type dispersion mixings, after drying, calcination processing, obtains the second mixture again；Second Mixture with barium titanate wet type dispersion mixing, obtains dispersion again.
For another example first by raw material D and barium titanate wet type dispersion mixing, and the first mixing is obtained after drying, calcination processing Thing；First mixture with raw material B and raw material C wet type dispersion mixings, after drying, calcination processing, obtains the second mixture again；The Two mixtures with raw material A wet type dispersion mixing, obtain dispersion again.
Mixed in the manner described above, hybrid mode does not enumerate, raw material A, raw material B, raw material C, raw material D and metatitanic acid The scattered order of barium wet type is different, and different scattered orders can be selected according to the performance required by dielectric material.
Involved wet type decentralized processing in said process, the solvent selected by it can be water or ethanol.Will be required After the material mixing of mixing, solvent is added, gained mixture is by sand mill ground and mixed.Specifically, zirconium can be used in sand mill Ball is abrasive media, and zirconium bulb diameter can require to choose according to specific grinding, for example with 0.1mm zirconium ball.Specifically, wet type The time of decentralized processing can adjust according to actual conditions.
Specifically, dispersion is obtained after carrying out wet type decentralized processing to raw material A, raw material B, raw material C, raw material D and barium titanate System, because the dispersion is slurry, then is dried processing to the dispersion.Drying process is dried using atomizer Machine, when dispersion is dried, dry purpose can either be reached, not interfere with the material distribution shape of dispersion again State.
In another specific embodiment, the barium titanate is prepared using hydro-thermal method；The temperature of the calcination processing is 600-900 DEG C, preferably 650-850 DEG C.
Specifically, the barium titanate prepared with hydro-thermal method, its particle size is smaller, generally in 20-80nm.Also, particle chi It is very little more uniform, it is easy to make the particle size of dielectric material to be maintained at less scope.Specifically, Jie prepared using the above method Material, its particle size may remain in 100-200nm.
Specifically, when siccative is calcined, its calcination processing temperature is 600-900 DEG C.Temperature is too low, and material calcining does not fill Point, lack of homogeneity, influence its reliability；Temperature is too high, and particle is big, is unfavorable for thin layer, and dielectric constant is low.
Specifically, the dielectric material obtained is proportionally mixed with adhesive, solvent etc., is then made by scattered Slurry, medium green compact diaphragm is made by casting machine in slurry, nickel or nickel alloy electricity are printed on membrane surface by screen printer Pole, further according to the design number of plies, electrode in lamination diaphragm and printing；The dielectric film of electrode, forms lamination in alternative stacked printing Piece；Green compact are formed by isostatic pressed, cutting again, green compact are sintered in reducing atmosphere, ceramic body is formed, is being made pottery after chamfering The outer electrode of Cu or Cu alloys is sealed up at porcelain body both ends, is sintered in protective atmosphere, finally obtains multilayer ceramic capacitor MLCC。
Beneficial effects of the present invention are mainly as follows：
(1) raw material is uniformly wrapped on the surface of barium titanate, can effectively suppress growing up for crystal grain in calcination process, so as to The size of control dielectric material is maintained at less scope, simultaneously, additionally it is possible to avoids enrichment of the raw material in regional area, improves and be situated between The reliability of material；
(2) raw material added can effectively improve the pressure-resistant performance of dielectric material, ceramic capacitor made by improvement Insulaion resistance performance, improve its service life.
Embodiment
With reference to embodiment, the embodiment of the present invention is described in further detail.Following examples are used for Illustrate the present invention, but be not limited to the scope of the present invention.
Using the preparation method of the present invention, the dielectric material being prepared, for making ceramic capacitor.It is appreciated that It is, according to experiment or production scale, the relative usage of material and processing time in the integrated regulation present invention that can be appropriate, so that The needs of it meets to test or produced.
Dielectric material in embodiment 1-60 is prepared with the following method.Raw material A, raw material B, raw material C and raw material D are mixed Afterwards, it is dissolved in solvent, 1h is ground using sand mill；Barium titanate of the gained mixture again with 100 molar parts mixes, and adds Same solvent carries out wet type decentralized processing, and 1-2h dries using centrifugal spray dryer in dispersions obtained system；What is obtained is dry Material calcines 2h at a certain temperature.The calcining material of gained mixes with raw material E again after calcining, and adds solvent, is ground in sand mill Mill is with dispersion mixing.The slurry that now dispersion mixing obtains uses centrifugal spray dryer drying process, the powder of gained again As dielectric material.Specifically, solvent used in each embodiment is same substance.Specifically, it is former when preparing dielectric material Expect A, raw material B, raw material C and the specific material of raw material D selections referring to table 1- tables 3.
After dielectric material prepares, the dielectric material obtained is proportionally mixed with adhesive, solvent etc., Ran Houjing Cross and disperse slurry is made, medium green compact diaphragm is made by casting machine in slurry, nickel is printed on membrane surface by screen printer Or nickel alloy electrode, further according to the design number of plies, electrode in lamination diaphragm and printing；The medium of electrode is thin in alternative stacked printing Film, form laminated sheet；Green compact are formed by isostatic pressed, cutting again, green compact are sintered in reducing atmosphere, form ceramic body, warp Cross after chamfering and seal up the outer electrode of Cu or Cu alloys at ceramic body both ends, sintered in protective atmosphere, finally obtain multilayer Ceramic capacitor MLCC.
The high temperature accelerated aging of the ceramic capacitor prepared using the above method is detected with the following method：At 150 DEG C, 20KV/mm DC voltages are applied to capacitor sample, determine life time, thus evaluate high temperature accelerated aging reliability (HALT).In embodiments of the invention, 10 are reduced to insulaion resistance since application6Following timing definition is the life-span.Specifically Parameter is referring to table 1- tables 3.
The embodiment 1-20 of the table 1 major parameter table of comparisons
The embodiment 21-40 of the table 2 major parameter table of comparisons
The embodiment 41-60 of the table 3 major parameter table of comparisons
Embodiment 61
Examined using composition same as Example 3, solvent, material calcining temperature, and using identical detection method Survey, it is differed only in：Raw material A uses Yb2O3。
Made ceramic capacitor, its dielectric thickness are 1.2 μm, HALT 24h.
Embodiment 62
Examined using composition same as Example 3, solvent, material calcining temperature, and using identical detection method Survey, it is differed only in：Raw material B uses MoO3。
Made ceramic capacitor, its dielectric thickness are 1.2 μm, HALT 23h.
Embodiment 63
Examined using composition same as Example 3, solvent, material calcining temperature, and using identical detection method Survey, it is differed only in：Raw material A, raw material B, raw material C, the hybrid mode of raw material D and barium titanate are different.
Specifically, first raw material A, raw material B and raw material the C method disperseed using wet type are well mixed, after this is well mixed Material and barium titanate wet type dispersion mixing, after being well mixed, then with raw material D use wet type dispersion mixing.
The ceramic capacitor that the dielectric material for being mixed by which and being prepared makes, its dielectric thickness are 1.2 μm, and HALT is 24h。
Finally, method of the invention is only preferable embodiment, is not intended to limit the scope of the present invention.It is all Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc., the protection of the present invention should be included in Within the scope of.

Claims (8)

1. a kind of dielectric material for ceramic capacitor, it is characterised in that the dielectric material includes following molar part content Component：The barium titanate of 98-105 parts, the raw material A of 0.5-2.5 parts, 0.2-0.8 parts raw material B, 0.1-0.5 part raw material C, The raw material E of raw material D and 0.2-1.0 part of 0.2-0.8 parts；
Wherein, the oxide of at least one of raw material A Ho, Yb, Gd, Dy, Sm and Y elements；
Raw material B is the oxide of at least one of W, Mo and V element；
Raw material C is the oxide of at least one of Mn, Cr and Co element；
Raw material D is the carbonate of at least one of Mg, Ca and Ba element；
Raw material E is the oxide of at least one of Si, Li, AL and B element.
A kind of 2. dielectric material for ceramic capacitor as claimed in claim 1, it is characterised in that the dielectric material bag Component containing following molar part content：It is preferred that 100 parts of barium titanate, the raw material A of 1-1.5 parts, raw material B, 0.2- of 0.3-0.6 parts The raw material E of raw material D and 0.5-0.8 part of 0.3 part raw material C, 0.5-0.7 part.
3. a kind of dielectric material for ceramic capacitor as claimed in claim 1 or 2, it is characterised in that the raw material A is excellent Elect Dy as2O3And/or Y2O3；
The raw material B is preferably V2O5；
The raw material C is preferably Mn3O4And/or Cr2O3；
The raw material D is preferably MgCO3And CaCO3；
The raw material E is preferably SiO2And/or Al2O3。
A kind of 4. dielectric material for ceramic capacitor as described in claim any one of 1-3, it is characterised in that BaTiO3 Produced using hydro-thermal method, BaTiO3Particle size be 20-80nm.
A kind of 5. dielectric material for ceramic capacitor as claimed in claim 4, it is characterised in that BaTiO3Particle chi Very little is preferably 40-60nm.
6. the preparation method of dielectric material as described in claim any one of 1-5, it is characterised in that including：
Step S1, the specification requirement based on the ceramic capacitor, by the raw material A, raw material B, raw material C, raw material D and barium titanate After gradation wet type dispersion mixing, dispersion is obtained；
Step S2, calcination processing is carried out after described dispersion drying process and obtains calcining material, the calcining material and the raw material E After mixing, then disperse through wet type successively and obtain the dielectric material after drying process.
7. preparation method as claimed in claim 6, it is characterised in that gradation wet type dispersion mixing described in step S1 is specifically wrapped Include：
Step S11, by the raw material A, raw material B, raw material C, raw material D and material more than any two classes or two classes in barium titanate After wet type dispersion mixing, the first mixture is obtained through drying, calcination processing；
Step S12, in described raw material A, raw material B, raw material C, raw material D and barium titanate with the different types of thing of the first mixture One kind or multiclass material in matter is again with after the first mixture wet type dispersion mixing, through drying, calcination processing, obtaining second Mixture；Until raw material A, raw material B, raw material C, raw material D and barium titanate are well mixed, the dispersion is obtained.
8. preparation method as claimed in claims 6 or 7, it is characterised in that：The temperature of the calcination processing is 600-900 DEG C, Preferably 650-850 DEG C.
CN201710955223.7A 2017-10-13 2017-10-13 A kind of dielectric material for ceramic capacitor and preparation method thereof Pending CN107840654A (en)

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CN112645708A (en) * 2020-12-24 2021-04-13 福建火炬电子科技股份有限公司 Anti-reduction BME ceramic dielectric capacitor and ceramic material for capacitor
CN113880569A (en) * 2021-10-11 2022-01-04 深圳市信维通信股份有限公司 Dielectric material of multilayer chip ceramic capacitor and preparation method thereof
CN114133238A (en) * 2021-11-02 2022-03-04 广东省先进陶瓷材料科技有限公司 Ceramic dielectric material and preparation method and application thereof
CN114685162A (en) * 2020-12-31 2022-07-01 陕西理工大学 Preparation method of semiconductor ceramic material
CN115180942A (en) * 2022-01-17 2022-10-14 山东国瓷功能材料股份有限公司 Dielectric material and preparation method and application thereof
CN115504781A (en) * 2022-08-24 2022-12-23 深圳先进电子材料国际创新研究院 Wide-temperature-range stable ceramic dielectric material and preparation method and application thereof

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CN106747419A (en) * 2016-12-16 2017-05-31 山东国瓷功能材料股份有限公司 A kind of dielectric material for mesohigh X7R characteristic multilayer ceramic capacitors

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Publication number Priority date Publication date Assignee Title
CN112645708A (en) * 2020-12-24 2021-04-13 福建火炬电子科技股份有限公司 Anti-reduction BME ceramic dielectric capacitor and ceramic material for capacitor
CN112645708B (en) * 2020-12-24 2022-07-15 福建火炬电子科技股份有限公司 Anti-reduction BME ceramic dielectric capacitor and ceramic material for capacitor
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CN115504781A (en) * 2022-08-24 2022-12-23 深圳先进电子材料国际创新研究院 Wide-temperature-range stable ceramic dielectric material and preparation method and application thereof

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