CN108878144A - A kind of multilayer ceramic capacitor and preparation method thereof - Google Patents
A kind of multilayer ceramic capacitor and preparation method thereof Download PDFInfo
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- CN108878144A CN108878144A CN201810544645.XA CN201810544645A CN108878144A CN 108878144 A CN108878144 A CN 108878144A CN 201810544645 A CN201810544645 A CN 201810544645A CN 108878144 A CN108878144 A CN 108878144A
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
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- 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
- H01G4/30—Stacked capacitors
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Abstract
The invention discloses a kind of preparation methods of multilayer ceramic capacitor, auxiliary burning particle and laminated body are mixed and are placed on load bearing board by the present invention, laminated body is sintered again, help firing point volatilization to form the higher local atmosphere of volatile concentrations around laminated body in auxiliary burning particle, the excessive volatilization for helping firing point in laminated body can be prevented, keeps the ceramic body even compact obtained after sintering, consistency good；The step of auxiliary preparation for burning particle is by pressing, therefore density is larger, and when sintering can provide enough local atmospheres for laminated body；Auxiliary burning particle volume is small and in irregular shape, therefore when auxiliary burning particle and laminated body are mixed, the auxiliary particle that burns can not form the contact of larger area with laminated body, so that sintered ceramic body is not easy and auxiliary burning particle adhesion；Can the laminated body to small volume to carry out row viscous, the adhesive in laminated body exclude ratio more thoroughly, the consistency and dielectric properties of ceramic body are preferable.
Description
Technical field
The present invention relates to a kind of capacitor and preparation method thereof, especially a kind of multilayer ceramic capacitor and its preparation side
Method.
Background technique
It prepares copper inner electrode multilayer ceramic capacitor to need using low sintering ceramic material, so as to total with copper inner electrode
Burn, thus typically contained in its ceramic material more content help firing point, so as to can lower than copper fusing point at a temperature of burn
Knot is fine and close.Due to helping firing point to tend to volatilize when sintering at high temperature, it is easy to make to be loaded in the ceramic core on same load bearing board
There is the problem of consistency deterioration in piece.Specifically, it is loaded in ceramic chip on same load bearing board when sintering at high temperature, loads close
Biggish ceramic chip is spent, due to helping firing point volatilization gas concentration higher, can interfere the progress volatilized, therefore more helps burning
Ingredient is retained in and forms the densification process that liquid phase promotes ceramic chip in ceramic chip, so that sintered ceramic chip is uniform
It is fine and close；And the lesser ceramic chip of loading density helps firing point volatilization loss then because helping firing point volatilization gas concentration lower
Seriously, ceramic chip is difficult to densified sintering product.So above-mentioned consistency shows as part ceramic chip or ceramic core the phenomenon that deterioration
The local color of piece is inconsistent, and porcelain body is loose, and intensity is low, and this phenomenon shows especially in the ceramic chip for being loaded into outermost
Significantly.
For above-mentioned sintering consistency problem, there is powder embedded sintering method known to this field as counter-measure, example
As using containing help firing point powder landfill ceramic capacitor be sintered, with achieve the purpose that improve sintering atmosphere, but by
More open stacking states are in the powder of landfill, often fails to provide enough local atmospheres, therefore not can solve problem.
CN201510347332.1 discloses a kind of preparation method of multilayer ceramic capacitor, will use same ceramic material
The laminated body and green briquette being prepared be placed on load bearing board together and make green briquette surround laminated body periphery to laminated body into
The step of row sintering, green briquette is by pressing, density is higher, is capable of providing enough local atmospheres and is guaranteed at the layer of periphery
Stack obtains good sintering consistency, but for the laminated body of load bearing board medium position, when its loading density is smaller, still
There are above-mentioned sintering consistency problems.On the other hand, due to helping more, the stacking of each surfacing of firing point in ceramic material
When body and the green briquette of each surfacing contact with each other, the two is easy stick to each other.
CN201510347334.0 discloses a kind of preparation method of multilayer ceramic capacitor, and laminated body is placed on and uses phase
In the second substrate by pressing being prepared with ceramic material, then the second substrate for being placed with laminated body is placed on and holds burning
Laminated body is sintered on plate, no matter so then loading density size of laminated body various loci on load bearing board, all
It is able to solve above-mentioned sintering consistency problem.But due to helping firing point more in ceramic material, deposit ceramic body after sintering
The problem of being easy stick to each other with the second substrate.
CN201510347333.6 discloses a kind of preparation method of multilayer ceramic capacitor, is equally able to solve above-mentioned burning
Consistency problem is tied, and is provided with isolated film between laminated body and first substrate, therefore will not be glued both after sintering
Even.But due to arranging viscous carried out to large volume of third substrate, there are the exclusions of adhesive contained in laminated body to be not thorough
The problem of declining to the consistency and uniformity of sintered ceramic body.
Summary of the invention
Based on this, a kind of multi-layer ceramics electricity is provided it is an object of the invention to overcome above-mentioned the deficiencies in the prior art place
The preparation method of container.
To achieve the above object, the technical solution used in the present invention is：A kind of preparation method of multilayer ceramic capacitor,
Include the following steps：
(1) ceramic slurry will be obtained after mixing doped with the ceramic powder, adhesive, organic solvent of sintering aid, with
Ceramic slurry is that ceramic membrane is prepared in raw material；
(2) metal paste is printed on ceramic membrane to electrode pattern in being formed, obtains being printed with interior electrode pattern after drying
Ceramic membrane；
(3) the ceramic film poststack for being printed with interior electrode pattern is obtained into lamination unit, it is then opposite in lamination unit
The ceramic membrane that two side difference Stacking steps (1) obtain, obtains first substrate；
(4) it is cut after pressing first substrate, obtains laminated body；
(5) it presses ceramic film poststack obtained by multiple steps (1) to obtain the second substrate；
(6) the second substrate is placed on load bearing board, the second substrate is carried out to arrange viscous processing；
(7) will row it is viscous treated that the second substrate crushes, obtain auxiliary burning particle；
(8) laminated body, auxiliary burning particle are mixed and is placed on load bearing board, laminated body is carried out to arrange viscous and sintering, is made pottery
Porcelain body；Then two external electrodes are enclosed in two end faces of the ceramic body after chamfering, and multi-layer ceramics of the present invention can be obtained
Capacitor.
Preferably, in the step (5), the second substrate with a thickness of 1~3mm.It is such then crushed and be easier, and
And the auxiliary burning particle obtained after crushing is more.
Preferably, in the step (3), the ceramic film poststack that 1~40 is printed with interior electrode pattern is laminated
Unit is then laminated the ceramic membrane that 1~20 step (1) obtains in two opposite sides of lamination unit respectively, obtains first
Substrate.
Preferably, in the step (6), carrying out the viscous detailed process of row to the second substrate is：Under air atmosphere, by
Two substrates are heated to 260 DEG C~450 DEG C and keep the temperature 2 hours~4 hours to exclude adhesive；Or in protective gas atmosphere
Under, the second substrate is heated to 400 DEG C~600 DEG C and keeps the temperature 3 hours~6 hours to exclude adhesive.
Preferably, in the step (7), the second substrate of the row after viscous is crushed with pulverizer, grinder, obtains auxiliary burning
Grain.When the second substrate is without arranging viscous, containing more adhesive, intensity is larger and has certain plasticity, is crushed and is compared
It is difficult；And the second substrate arranged after gluing is more crisp, is easy to crush.
Preferably, in the step (8), when laminated body, auxiliary burning particle to be placed on load bearing board, with sieve by auxiliary burning
Particle is uniformly sprinkling upon on load bearing board, mixes auxiliary burning particle with laminated body, is then carried out arranging viscous and sintering to laminated body, be made pottery
Porcelain body；
Or
It is viscous that laminated body is first placed on the row of progress on load bearing board, then is uniformly sprinkling upon auxiliary burning particle on load bearing board with sieve,
Laminated body after keeping auxiliary burning particle viscous with row mixes, and is then sintered to laminated body, obtains ceramic body.
When sintering, auxiliary burn in particle helps firing point volatilization to form the higher part of volatile concentrations around laminated body
Atmosphere can prevent the excessive volatilization for helping firing point in laminated body, make the ceramic body even compact obtained after sintering, consistency
It is good.
It is highly preferred that in the step (8), when laminated body, auxiliary burning particle are placed on load bearing board, the auxiliary burning
Grain fills all laminated bodies.So it can guarantee laminated body all when sintering all in the part gas as provided by auxiliary burning particle
In the coverage of atmosphere.
Preferably, the mesh number of the sieve is 60~100 mesh.So that the auxiliary burning particle of suitable size is mixed with laminated body.
When sieve mesh number is less than 60 mesh, auxiliary burning particle is too big, easy and sintered ceramic body adhesion, and the ceramics with small volume
Body is difficult to separate.When sieve mesh number is greater than 100 mesh, auxiliary burning particle is too small, is easy to drift to form dust, is unfavorable for production environment
Cleaning, and the operation for crushing the second substrate of the row after viscous in step (7) also can be relatively difficult.
Preferably, in the step (8), carrying out the viscous detailed process of row to laminated body is：Under protective gas atmosphere,
Laminated body is heated to 400 DEG C~600 DEG C and keeps the temperature 3h~6h to exclude adhesive；Protective gas atmosphere be nitrogen atmosphere,
Argon atmosphere or helium atmosphere.
Preferably, in the step (8), it is to the detailed process that laminated body is sintered：Under reducibility gas atmosphere,
It is heated to 980 DEG C~1050 DEG C by laminated body of the row after viscous and keeps the temperature 1.5h~3h to be sintered, ceramics are obtained after the completion of sintering
Body；Reducibility gas atmosphere be nitrogen and hydrogen mixed gas atmosphere, wherein the volume ratio of hydrogen and nitrogen be (0.1~
3)：100.
It is auxiliary when auxiliary burning particle and laminated body are mixed since auxiliary burning particle volume is small and in irregular shape
The contact of larger area can not be formed with laminated body by burning particle, so that sintered ceramic body is not easy and auxiliary burning particle adhesion.
Preferably, in the ceramic powder doped with sintering aid, the mass percentage of the sintering aid is 4~
15%.
The densification for promoting laminated body in the sintering process of laminated body, reduces sintering temperature, so as in the molten of copper
Point following temperature is sintered laminated body.The too low acceleration of sintering of content it is not sufficiently effective, content is too high, will lead to the electrostatic of capacitor
Capacity decline and dielectric loss increase.
Preferably, in the step (1), ceramic membrane with a thickness of 5~40 μm.Such range is selected, so that can prepare
Static capacity range it is larger, while the preparation of ceramic membrane is also easier.
Preferably, in the step (1), the weight doped with the ceramic powder of sintering aid, adhesive, organic solvent
Than for：Doped with the ceramic powder of sintering aid：Adhesive：Organic solvent=10：(3~5)：(6~9).
Preferably, it will be mixed doped with the first ceramic powder, adhesive, organic solvent of sintering aid using ball-milling method equal
Even, Ball-milling Time is 10~16h.
Preferably, the main component of the ceramic powder is calcium zirconate or strontium zirconate, and the sintering aid is SiO2Or Bi2O3,
Described adhesive is polyvinyl butyral, and the organic solvent is the mixed solvent of toluene and ethyl alcohol, the toluene and ethyl alcohol
Weight ratio be：Toluene：Ethyl alcohol=(1~1.5)：1.
It preferably, also include modified additive in the ceramic slurry, the modified materials are the oxide of calcium, titanium
At least one of oxide, oxide of manganese, it is described doped with the ceramic powder of sintering aid and the weight ratio of modified materials
For：Doped with the ceramic powder of sintering aid：Modified materials=(96~97)：(3~4).
It preferably, further include by laminated body and jade before laminated body is placed on load bearing board in the step (8)
The step of rice starch is sufficiently mixed.
Meanwhile the present invention also provides a kind of multilayer ceramic capacitors that the preparation method is prepared.
Compared with the existing technology, beneficial effects of the present invention are：
Auxiliary burning particle and laminated body are mixed and are placed on load bearing board by the present invention, then laminated body is sintered, auxiliary burning
It helps firing point volatilization to form the higher local atmosphere of volatile concentrations around laminated body in grain, can prevent in laminated body
The excessive volatilization for helping firing point keeps the ceramic body even compact obtained after sintering, consistency good.
The step of auxiliary preparation for burning particle is by pressing, therefore density is larger, and when sintering can provide enough for laminated body
Local atmosphere.
Laminated body on load bearing board is filled by auxiliary burning particle, no matter the then loading density of laminated body, is at auxiliary burning
In the coverage for the local atmosphere that particle is formed, it is more convenient that laminated body is placed on the operation on load bearing board.
Auxiliary burning particle volume is small and in irregular shape, therefore when auxiliary burning particle and laminated body are mixed, auxiliary to burn
Grain can not form the contact of larger area with laminated body, so that sintered ceramic body is not easy and auxiliary burning particle adhesion.
Can the laminated body to small volume to carry out row viscous, the adhesive in laminated body exclude ratio more thoroughly, ceramic body
Consistency and dielectric properties it is preferable.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the preparation method of multilayer ceramic capacitor of the present invention.
Fig. 2 is the dc breakdown voltage curve of the multilayer ceramic capacitor of embodiment and comparative example 1~4.
Specific embodiment
To better illustrate the object, technical solutions and advantages of the present invention, below in conjunction with the drawings and specific embodiments pair
The present invention is described further.
A kind of embodiment of multilayer ceramic capacitor of the present invention, in conjunction with Fig. 1, multi-layer ceramic capacitance described in the present embodiment
Device is prepared by the following method gained：
Step 1：Ceramic slurry will be obtained after mixing doped with the ceramic powder, adhesive, organic solvent of sintering aid,
Then ceramic membrane is prepared by raw material of ceramic slurry.
In present embodiment, will doped with the ceramic powder, adhesive, organic solvent of sintering aid be uniformly mixed operation
For：It will be uniformly mixed doped with the ceramic powder, adhesive, organic solvent of sintering aid using ball-milling method, Ball-milling Time can be
10~16h.
In ceramic slurry, the mass ratio doped with the ceramic powder of sintering aid, adhesive and organic solvent is 10：(3~
5)：(6~9).
In present embodiment, doped in the ceramic powder of sintering aid, the mass percent of sintering aid is 4%~
15%.The main component of ceramic powder is calcium zirconate or strontium zirconate, and sintering aid can be SiO2Or Bi2O3, adhesive is polyethylene
Butyral, organic solvent are that mass ratio is (1~1.5)：1 toluene and the mixed solvent of ethyl alcohol.
It in a preferred embodiment, further include modified materials in ceramic slurry.Modified materials can be calcium
The oxide of oxide, titanyl compound or manganese, the mass ratio of ceramic powder and modified materials doped with sintering aid are (96
~97)：(3~4).
It is prepared in the operation of ceramic membrane by raw material of ceramic slurry, ceramic slurry can be formed using the tape casting and be made pottery
Porcelain film, the thickness of obtained ceramic membrane can be 5~40 μm.
Step 2：Metal paste is printed on ceramic membrane to electrode pattern in being formed, obtains being printed with interior electrode figure after drying
The ceramic membrane of case.
Metal paste is printed in being formed on ceramic membrane in the operation of electrode pattern, the metal in metal paste can be
Copper, printing selection silk-screen printing technique.
Step 3：The ceramic film poststack for being printed with interior electrode pattern is obtained into lamination unit, it is then opposite in lamination unit
Two sides distinguish laminated ceramic film, obtain first substrate.
The ceramic membrane for being printed with interior electrode pattern is laminated by scheduled quantity, obtains lamination unit.Then single in stacking
Opposite two sides of member respectively laminated ceramic film to form two protections for being covered each by two opposite sides of lamination unit
Layer forms protective layer, the structure that lamination unit and protective layer stack gradually, obtains first substrate.
In general, lamination unit can be laminated to obtain for 1~40 ceramic membrane for being printed with interior electrode pattern.It is covered each by
Two protective layers of two opposite sides of lamination unit can be laminated to obtain for 1~20 ceramic membrane.
Step 4：It is cut after first substrate is pressed, obtains laminated body.
Step 4 is specifically as follows：First substrate fixation is pressed with isostatic pressing method on stainless steel, is made in first substrate
Each film layer closely bonds；Then first substrate is cut in length and breadth by predetermined size, obtain the laminated body of multiple cuboids, finally by layer
Stack is separated from stainless steel plate.
Step 5：Multiple ceramic film poststacks are pressed to obtain the second substrate.Pressing with oil pressure or can wait the sides of static pressure
Method.The thickness of the second substrate is not particularly limited, but preferably 1mm~3mm.
Step 6：The second substrate is placed on load bearing board, it is viscous then to carry out row to the second substrate.
The second substrate is carried out in the viscous operation of row, arranging viscous detailed process is：Under air atmosphere, by the second substrate plus
Heat is to 260 DEG C~450 DEG C and keeps the temperature 2 hours~4 hours to exclude adhesive；Or under protective gas atmosphere, by second
Substrate is heated to 400 DEG C~600 DEG C and keeps the temperature 3 hours~6 hours to exclude adhesive.
Protective gas atmosphere can be nitrogen atmosphere, argon atmosphere or helium atmosphere.
Step 7：The second substrate of the row after viscous is crushed, auxiliary burning particle is obtained.
The second substrate of the row after viscous can be crushed with pulverizer, grinder etc., obtain auxiliary burning particle.The second substrate without
When row is viscous, containing more adhesive, intensity is larger and has certain plasticity, is crushed relatively difficult；And after row is viscous
The second substrate is more crisp, is easy to crush.The second substrate with a thickness of 1~3mm when, crushed and be easier, and crushed
The auxiliary burning particle obtained afterwards is more.
Step 8：Laminated body and auxiliary burning particle are placed on load bearing board, then carries out arranging viscous and sintering for laminated body, obtain
To ceramic body.
Laminated body is placed on load bearing board, is preferably placed without overlapping to prevent from gluing between sintered ceramic body
Auxiliary burning particle then can be equably sprinkling upon on load bearing board with sieve, so that auxiliary burning particle is mixed with laminated body, then right by piece
Laminated body carries out row and glues and be sintered, and obtains ceramic body.When sintering, auxiliary burn in particle helps firing point volatilization in laminated body week
It encloses to form the higher local atmosphere of volatile concentrations, the excessive volatilization for helping firing point in laminated body can be prevented, obtained after making sintering
Ceramic body even compact, consistency it is good.Preferably, so that auxiliary burning particle is filled all laminated bodies enables laminated body invisible, such as
This can guarantee laminated body all when sintering all in the coverage of the local atmosphere as provided by auxiliary burning particle.
Auxiliary burning particle is equably sprinkling upon on load bearing board with sieve, when auxiliary burning particle and laminated body being made to mix, is used
The mesh number of sieve be preferably 60 mesh~100 mesh so that the auxiliary burning particle of suitable size is mixed with laminated body.Sieve mesh number is less than
When 60 mesh, auxiliary burning particle is too big, easy and sintered ceramic body adhesion, and is difficult to separate with the ceramic body of small volume.
When sieve mesh number is greater than 100 mesh, auxiliary burning particle is too small, is easy to drift to form dust, is unfavorable for the cleaning of production environment, and walks
The operation for crushing the second substrate of the row after viscous in rapid 7 also can be relatively difficult.
Laminated body arrange in viscous and sintering operation, arranging viscous detailed process is：It, will under protective gas atmosphere
Laminated body is heated to 400 DEG C~600 DEG C and keeps the temperature 3h~6h to exclude adhesive.
Protective gas atmosphere can be nitrogen atmosphere, argon atmosphere or helium atmosphere.
Laminated body arrange in viscous and sintering operation, the detailed process of sintering is：It, will under reducibility gas atmosphere
Laminated body after row is viscous is heated to 980 DEG C~1050 DEG C and keeps the temperature 1.5h~3h being sintered, and ceramic body is obtained after the completion of sintering.
Reducibility gas atmosphere can be the mixed gas atmosphere of nitrogen and hydrogen, wherein the volume ratio of hydrogen and nitrogen
For (0.1~3)：100.
It is auxiliary when auxiliary burning particle and laminated body are mixed since auxiliary burning particle volume is small and in irregular shape
The contact of larger area can not be formed with laminated body by burning particle, so that sintered ceramic body is not easy and auxiliary burning particle adhesion.
As needed, it can also increase before laminated body is placed on load bearing board and fill laminated body and cornstarch
The step of dividing mixing, the surface adhesion of laminated body is made to have cornstarch, cornstarch serves every gluing, facilitates after preventing sintering
Ceramic body between and ceramic body and auxiliary burning particle adhesion.
Size difference be can use after sintering by ceramic body and auxiliary burning particle screening.
In other implementations, laminated body first can also be placed on the row of progress on load bearing board to glue, then will with sieve
Auxiliary burning particle is equably sprinkling upon on load bearing board, so that auxiliary burning particle is mixed with laminated body of the row after viscous, then just by laminated body
Sintering.
Step 9：After ceramic body chamfering, two external electrodes are enclosed in two end faces of the ceramic body after chamfering respectively, obtain
To multilayer ceramic capacitor.
To ceramic body carry out chamfering operation can be：By ceramic body with planetary mills or the method chamfering of barreling, make its side
Angle becomes round and smooth.
The operation that two external electrodes are enclosed in two end faces of the ceramic body after chamfering respectively is specially：Respectively after chamfering
Two end face coated copper metal pastes of ceramic body be coated with the ceramics of copper metal slurry under protective gas atmosphere
Body is heated to 750 DEG C~850 DEG C and keeps the temperature 10min~12min with sintered copper metal paste, and close attachment respectively is formed after sintering
Two external electrodes in two end faces of ceramic body.
Protective gas atmosphere can be nitrogen atmosphere, argon atmosphere or helium atmosphere.
It is appreciated that in the preparation method of above-mentioned multilayer ceramic capacitor, the preparation of ceramic body and the auxiliary preparation for burning particle
It may be performed simultaneously, and laminated body arrange to glue and carry out row to auxiliary burning particle and is glued, it can be using identical temperature song
Line and atmosphere system are so then prepared more convenient.
By multilayer ceramic capacitor (0201 specification, nominal static capacity 2.7pF, the electrostatic of embodiment and comparative example 1~4
Volume error rank is B grades) it compares, wherein comparative example 1 is the method sintering laminated body using powder landfill, comparative example
2,3,4 be the method sinter layer according to CN201510347332.1, CN201510347334.0, CN201510347333.6 respectively
Stack.The averag density that 10,000 ceramic bodies are measured using drainage uses HP4278A capacitance meter after ceramic body is formed external electrode
Static capacity is tested with 1MHz test frequency and 1.0Vrms test frequency at 25 DEG C, and direct current is tested using pressure tester
Breakdown voltage.Measurement test result is shown in Table 1 and Fig. 2.
Table 1 measures test result
As table 1 and Fig. 2 as it can be seen that all laminated bodies are all protected by local atmosphere provided by auxiliary burning particle in embodiment,
Adhesive excludes also more thoroughly, so sintered ceramic body appearance is qualified, consistency is good, does not have a bonding die phenomenon, density compared with
Height, dielectric properties are good and concentration degree is high.The landfill powder of comparative example 1 fails to provide enough local gas because of loosely-packed
Atmosphere causes the ceramic body abnormal appearance of larger proportion, and density reduces, and static capacity and dc breakdown voltage all seriously disperse.It is right
In ratio 2, positioned at the lesser laminated body of the individual loading densities of load bearing board medium position not by green briquette provide local gas
Atmosphere protection then has inconsistent a certain proportion of ceramic body appearance, density reduction and dielectric properties to disperse, and due to stacking
The phenomenon that contact area of body and green briquette is larger, and there are ceramic body and sintered green briquette bonding dies.Although comparative example 3 does not have
Appearance consistency problem, dielectric properties are also good, but since the contact area of the second substrate in ceramic body and this is big, therefore deposit
In large scale bonding die, do not adapt to produce in enormous quantities.The ceramic body appearance of comparative example 4 is qualified, also without bonding die, but because of adhesive
Exclusion is not thorough, the densification of laminated body when hampering sintering, and density significantly reduces, because ceramic body consistency and uniformity compared with
Difference, static capacity and dc breakdown voltage all obviously disperse.Ceramic body even compact that in summary, the present invention is prepared,
Consistency is good, and dielectric properties are excellent.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than protects to the present invention
The limitation of range is protected, although the invention is described in detail with reference to the preferred embodiments, those skilled in the art should
Understand, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the essence of technical solution of the present invention
And range.
Claims (10)
1. a kind of preparation method of multilayer ceramic capacitor, which is characterized in that include the following steps：
(1) ceramic slurry will be obtained after mixing doped with the ceramic powder, adhesive, organic solvent of sintering aid, with ceramics
Slurry is that ceramic membrane is prepared in raw material；
(2) metal paste is printed on ceramic membrane to electrode pattern in being formed, the pottery for being printed with interior electrode pattern is obtained after drying
Porcelain film；
(3) the ceramic film poststack for being printed with interior electrode pattern is obtained into lamination unit, then in opposite two of lamination unit
The ceramic membrane that side difference Stacking steps (1) obtains, obtains first substrate；
(4) it is cut after pressing first substrate, obtains laminated body；
(5) it presses ceramic film poststack obtained by multiple steps (1) to obtain the second substrate；
(6) the second substrate is placed on load bearing board, the second substrate is carried out to arrange viscous processing；
(7) will row it is viscous treated that the second substrate crushes, obtain auxiliary burning particle；
(8) laminated body, auxiliary burning particle are mixed and is placed on load bearing board, laminated body is carried out to arrange viscous and sintering, obtains ceramic body；
Then two external electrodes are enclosed in two end faces of the ceramic body after chamfering, and multi-layer ceramic capacitance of the present invention can be obtained
Device.
2. the preparation method of multilayer ceramic capacitor as described in claim 1, which is characterized in that in the step (5), second
Substrate with a thickness of 1~3mm.
3. the preparation method of multilayer ceramic capacitor as described in claim 1, which is characterized in that in the step (3), by 1
~40 ceramic film poststacks for being printed with interior electrode pattern obtain lamination unit, then two sides opposite in lamination unit
The ceramic membrane that 1~20 step (1) obtains is laminated respectively, obtains first substrate.
4. the preparation method of multilayer ceramic capacitor as described in claim 1, which is characterized in that in the step (8), inciting somebody to action
When laminated body, auxiliary burning particle are placed on load bearing board, auxiliary burning particle is uniformly sprinkling upon on load bearing board with sieve, make auxiliary burning particle with
Then laminated body mixing carries out laminated body arranging viscous and sintering, obtains ceramic body；
Or
It is viscous that laminated body is first placed on the row of progress on load bearing board, then is uniformly sprinkling upon auxiliary burning particle on load bearing board with sieve, is made auxiliary
It burns the laminated body after particle is glued with row to mix, then laminated body is sintered, obtains ceramic body.
5. the preparation method of multilayer ceramic capacitor as claimed in claim 4, which is characterized in that in the step (8), inciting somebody to action
When laminated body, auxiliary burning particle are placed on load bearing board, the auxiliary burning particle fills all laminated bodies.
6. the preparation method of multilayer ceramic capacitor as described in claim 4 or 5, which is characterized in that the mesh number of the sieve
For 60~100 mesh.
7. the preparation method of multilayer ceramic capacitor as described in claim 1, which is characterized in that helped described doped with sintering
In the ceramic powder of agent, the mass percentage of the sintering aid is 4~15%.
8. the preparation method of multilayer ceramic capacitor as described in claim 1, which is characterized in that in the step (1), ceramics
Film with a thickness of 5~40 μm.
9. the preparation method of multilayer ceramic capacitor as described in claim 1, which is characterized in that in the step (8), inciting somebody to action
Before laminated body is placed on load bearing board, further include the steps that for laminated body and cornstarch being sufficiently mixed.
10. a kind of multilayer ceramic capacitor being prepared by any one of claim 1~9 preparation method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810544645.XA CN108878144B (en) | 2018-05-30 | 2018-05-30 | Multilayer ceramic capacitor and preparation method thereof |
Applications Claiming Priority (1)
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| CN111933451A (en) * | 2020-07-08 | 2020-11-13 | 四川华瓷科技有限公司 | Preparation method of radio frequency chip type multilayer ceramic capacitor |
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