CN105185588B - The preparation method of multilayer ceramic capacitor - Google Patents
The preparation method of multilayer ceramic capacitor Download PDFInfo
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- CN105185588B CN105185588B CN201510609129.7A CN201510609129A CN105185588B CN 105185588 B CN105185588 B CN 105185588B CN 201510609129 A CN201510609129 A CN 201510609129A CN 105185588 B CN105185588 B CN 105185588B
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Abstract
The invention discloses a kind of preparation method of multilayer ceramic capacitor, include the following steps: to prepare ceramic body；Chamfered is carried out to the ceramic body using the abrasive media comprising quartz sand；Drying obtains mixture after the ceramic body after the abrasive media and chamfering is carried out crude separation using sieve, the mixture include ceramic body and with the comparable quartz sand of ceramic body volume；By mixture from sustained height free-falling, apply the air-flow of stable and uniform from a side of mixture to mixture for ceramic body and the quartzy sand separation；Two external electrodes are enclosed in two opposite end faces of the ceramic body respectively after chamfering, obtain multilayer ceramic capacitor.The preparation method of this multilayer ceramic capacitor, is separated ceramic body and quartz sand by way of air blowing, and sorting is relatively easy to.
Description
Technical field
The present invention relates to field of electrical components, more particularly, to a kind of preparation method of multilayer ceramic capacitor.
Background technique
Copper inner electrode multilayer ceramic capacitor, as inner electrode, has extremely low equivalent string using the copper of high conductivity
Join resistance, is suitable for frequency applications occasion.And with high frequency and the application demand of more low ESR, copper inner electrode
The small-sized of multilayer ceramic capacitor has become mainstream.
In the preparation process of multilayer ceramic capacitor, needs the ceramic body that will be obtained after sintering to carry out chamfer grinding, make
The corner angle of ceramic body are round and smooth, in order to enclose external electrode on ceramic body and conducive to connecting copper inner electrode preferably with external electrode
It connects.The abrasive media of chamfering mainly uses alumina balls, quartz sand and alumina powder etc..By ceramic body from grinding medium after chamfering
It is separated in matter.When ceramic body size abrasive media differs greatly, can complete to sort with the sieve of different meshes；When
When ceramic body dimensions smaller (0402 specification, 0201 specification as defined in EIA standard), size and quartz sand are close,
It can not be sorted with sieve.Quartz sand is in irregular shape, will not roll when being placed on inclined-plane with ceramic body；And in copper
Electrode multilayer ceramic capacitor can not also be sorted since copper cannot be attracted by magnet using magnetic method.So for copper
Inner electrode multilayer ceramic capacitor, the ceramic body after chamfering sort it is extremely difficult, cause the production cycle extend and people
Work increased costs, and be mixed into the quartz sand in ceramic body to the external electrode of capacitor presentation quality and capacitor it is reliable
Property brings hidden danger.
Summary of the invention
Based on this, it is necessary to provide a kind of preparation method for sorting and being relatively easy to multilayer ceramic capacitor.
A kind of preparation method of multilayer ceramic capacitor, comprising the following steps:
Prepare ceramic body；
Chamfered is carried out to the ceramic body using the abrasive media comprising quartz sand；
Drying obtains mixture after the ceramic body after the abrasive media and chamfering is carried out crude separation using sieve,
The mixture include ceramic body and with the comparable quartz sand of ceramic body volume；
By the mixture from sustained height free-falling, applies from a side of the mixture to the mixture and stablize
Uniform air-flow is by the ceramic body and the quartzy sand separation；And
Two external electrodes are enclosed in two opposite end faces of the ceramic body respectively after chamfering, obtain multi-layer ceramic capacitance
Device.
In one embodiment, the ceramic body preparation the following steps are included:
Ceramic powder, adhesive, organic solvent are obtained into ceramic slurry after mixing, are then original with the ceramic slurry
Ceramic membrane is prepared in material；
Electrode pattern in being formed on the ceramic membrane, obtains the ceramic membrane for being printed with interior electrode pattern；
Multiple ceramic film poststacks for being printed with interior electrode pattern are obtained into lamination unit, then in the stacking
Multiple ceramic membranes are laminated in two opposite surfaces of unit respectively, obtain multilayer board；
It will be cut after multilayer board pressing, obtain laminated body；And
The laminated body is carried out to arrange viscous and sintering, obtains the ceramic body.
In one embodiment, the abrasive media includes alumina balls, quartz sand, alumina powder and deionized water.
In one embodiment, by the mixture from sustained height free-falling, from a side of the mixture to institute
It states mixture and applies the air-flow of stable and uniform in the step of the ceramic body and the quartzy sand separation, the mixture is set
In on vibrator supply device, continuous feeding is carried out by vibrator supply device, falls mixture successively uniformly from sustained height
Under.
In one embodiment, by the mixture from sustained height free-falling, from a side of the mixture to institute
It states mixture and applies the air-flow of stable and uniform by the step of the ceramic body and the quartzy sand separation, by the vibration
Air blower is arranged in the lower section of feeding device, to apply the gas of stable and uniform from the side of the mixture to the mixture
Stream.
In one embodiment, the air blower applies stable and uniform from a side of the mixture to the mixture
Horizontal gas flow is by the ceramic body and the quartzy sand separation.
In one embodiment, in the ceramic slurry, the matter of the ceramic powder, described adhesive and the organic solvent
Amount is than being 10:3~5:6~9, and the main component of the ceramic powder is calcium zirconate or strontium zirconate, and described adhesive is polyvinyl alcohol
Butyral；The organic solvent is the mixture of the toluene that mass ratio is 1~1.5:1 and ethyl alcohol.
In one embodiment, electrode pattern in being formed on the ceramic membrane, obtains being printed with interior electrode pattern
In the step of ceramic membrane, electrode size is printed on the ceramic membrane and forms the interior electrode pattern, the interior electricity
Pole slurry is copper metal slurry, and the printing selects silk-screen printing technique.
In one embodiment, described arrange in viscous and sintering operation to the laminated body, the row glues specific
Process are as follows: under protective gas atmosphere, the laminated body is heated to 400 DEG C~600 DEG C and keeps the temperature 3h~6h to exclude
State adhesive；The detailed process of the sintering are as follows: under reducibility gas atmosphere, the laminated body of the row after viscous is heated to
It 980 DEG C~1050 DEG C and keeps the temperature 1.5h~3h and is sintered.
In one embodiment, two external electrodes are enclosed in two end faces of the ceramic body after chamfering respectively
Operation specifically: two end face coated copper metal pastes of the ceramic body after chamfering respectively, in protective gas atmosphere
Under, the ceramic body for being coated with copper metal slurry is heated to 750 DEG C~810 DEG C and keeps the temperature 10min~12min with sintered copper
Metal paste forms two external electrodes of two end faces for being adhering closely to the ceramic body respectively after sintering.
In the preparation method of this multilayer ceramic capacitor, the averag density of ceramic body is about with the content difference of copper
4.6g/cm3-5.4g/cm3, and the density of quartz sand is about 2.65g/cm3, with the density contrast of ceramic body away from significant, therefore gas
After stream acts on mixture, due to the volume sizableness of ceramic body and quartz sand, the wind-force size phase of the two is acted on
When, but the two density difference is larger, under identical wind-force, ceramic body is due to heavier, and the displacement along wind direction is smaller, quartz sand
Due to relatively light, the displacement along wind direction is larger, thus separation of ceramic body and quartz sand, so that being sorted to the ceramic body after chamfering
More convenient, multilayer ceramic capacitor size obtained is small and electrode in being made using copper, therefore with extremely low equivalent
Series resistance is suitable for frequency applications field.
Detailed description of the invention
Fig. 1 is the flow chart of the preparation method of the multilayer ceramic capacitor of an embodiment；
Fig. 2 is the structural representation of sorting unit used in the preparation method of the multilayer ceramic capacitor of an embodiment
Figure.
Specific embodiment
It is described in further detail below mainly in combination with preparation method of the attached drawing to multilayer ceramic capacitor.
Referring to Fig. 1, the preparation method of the multilayer ceramic capacitor of an embodiment, includes the following steps:
S10, ceramic powder, adhesive, organic solvent are obtained into ceramic slurry after mixing, are then original with ceramic slurry
Ceramic membrane is prepared in material.
In present embodiment, by the uniformly mixed operation of ceramic powder, adhesive, organic solvent are as follows: will be made pottery using ball-milling method
Porcelain powder, adhesive, organic solvent are uniformly mixed, and Ball-milling Time can be 10h~16h.
In ceramic slurry, the mass ratio of ceramic powder, adhesive and organic solvent is 10:3~5:6~9.
Further, also doped with sintering aid in ceramic powder, specifically in the present embodiment, ceramic powder and sintering aid
Mass ratio be 85~92:4~12.The main component of ceramic powder is calcium zirconate or strontium zirconate, and sintering aid is selected from SiO2And
Bi2O3At least one of.
Further, adhesive is polyvinyl butyral, and organic solvent is the toluene and second that mass ratio is 1~1.5:1
The mixed solvent of 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, can be formed ceramic slurry using the tape casting by raw material of ceramic slurry
Ceramic membrane.
The thickness of obtained ceramic membrane can be 10 μm~40 μm.
S20, interior electrode pattern is formed on ceramic membrane, obtain the ceramic membrane for being printed with interior electrode pattern.
Preferably, electrode size is printed on the ceramic membrane that S10 is obtained to electrode pattern in being formed, is obtained after drying
It is printed with the ceramic membrane of interior electrode pattern.Further, electrode size can be copper metal slurry, printing selection screen printing
Dataller's skill.
S30, multiple ceramic film poststacks for being printed with interior electrode pattern are obtained into lamination unit, then in lamination unit
Multiple ceramic membranes are laminated in two opposite surfaces respectively, obtain multilayer board.
Multiple ceramic membranes for being printed with interior electrode pattern are laminated by scheduled quantity, obtain lamination unit.Then exist
Multiple ceramic membranes are laminated respectively to be formed and be covered each by two opposite sides of lamination unit in two opposite surfaces of lamination unit
Two protective layers in face form protective layer, the structure that lamination unit and protective layer stack gradually, obtain multilayer board.
In general, lamination unit can be laminated to obtain for 2~60 ceramic membranes for being printed with interior electrode pattern.Respectively
Two protective layers on two opposite surfaces of covering lamination unit can be laminated to obtain for 5~10 ceramic membranes.
S40, it is cut after pressing multilayer board, obtains laminated body.
S40 is specifically as follows: multilayer board fixation being pressed with isostatic pressing method on stainless steel, is made each in multilayer board
Film layer closely bonds；Then multilayer board is cut in length and breadth by predetermined size, obtain the laminated body of multiple cuboid shaped like chips；Finally
Laminated body is separated from stainless steel plate.
The length of laminated body and wide (being determined by cutting step pitch) are respectively 1.1mm~1.2mm and 0.52mm~0.62mm, or
Person is respectively 0.62mm~0.68mm and 0.28mm~0.34mm, so that the multilayer ceramic capacitor being finally prepared accords with respectively
Close the length and width dimensions requirement of 0402 specification or 0201 specification.
S50, laminated body is carried out to arrange viscous and sintering, obtains ceramic body.
Laminated body arrange in viscous and sintering operation, arranges viscous detailed process are as follows:, 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 are as follows:, 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.
S60, chamfered is carried out to the ceramic body using the abrasive media comprising quartz sand.
Preferably, abrasive media includes alumina balls, quartz sand, alumina powder and deionized water.Further, aluminium oxide
Ball, quartz sand, alumina powder and deionized water mass ratio be 4~6:3~4:4~5:8~10.Wherein, alumina balls play master
Ablation, quartz sand play time ablation, and alumina powder plays fine grinding, and deionized water works as a buffer, so that falling
Ceramic body corner behind angle is round and smooth and does not generate and collapses damage or crackle, and chamfering efficiency is higher.
Preferably, multiple ceramic bodies and abrasive media are subjected to chamfering in a manner of planetary mills or barreling.
S70, the ceramic body after abrasive media and chamfering is obtained into mixture using drying after sieve progress crude separation, mixed
Object include ceramic body and with the comparable quartz sand of ceramic body volume.
After chamfering, alumina powder and deionized water are removed with sieve, then dry residual moisture, then will be aoxidized with sieve
Aluminium ball and remove with the biggish quartz sand of ceramic body difference in size, be left ceramic body and with the sizable quartz of ceramic body
Sand.
S80, by mixture from sustained height free-falling, apply the gas of stable and uniform from a side of mixture to mixture
It flows ceramic body and the quartzy sand separation.
Referring to Fig. 2, the sorting unit 100 of an embodiment includes vibrator supply device 10, blower device and collection dress
Set 50.
Mixture is placed on vibrator supply device 10, can make for carrying out continuous feeding by vibrator supply device 10
Mixture is successively uniformly fallen from the discharge port of vibrator supply device 10.
The air outlet of blower device is set to the lower section of vibrator supply device 10, and is located at self-excited oscillation feeding device 10 freely
The side of the mixture fallen, to apply the air-flow of stable and uniform from a side of mixture to mixture.Ceramic body is averaged
Density is about 4.6g/cm with the content difference of copper3-5.4g/cm3, and the density of quartz sand is about 2.65g/cm3, with ceramics
The density contrast of body is away from significant, therefore airflow function is after mixture, due to the volume sizableness of ceramic body and quartz sand,
The wind-force sizableness both acted on, but the two density difference is larger, under identical wind-force, ceramic body due to heavier,
Displacement along wind direction is smaller, and for quartz sand due to relatively light, the displacement along wind direction is larger.
Collection device 50 is set to the lower section of vibrator supply device 10, and with 10 predetermined distance of vibrator supply device.
Collection device 50 includes the first receiving portion 52 and the second receiving portion 54, and gear is equipped between the first receiving portion 52 and the second receiving portion 54
Plate 56.Ceramic body falls into the first receiving portion 52 since the displacement along wind direction is smaller, quartz sand since the displacement along wind direction is larger,
Fall into the second receiving portion 54.
Preferably, buffer is contained in the first receiving portion 52 to buffer the falling speed for falling into ceramic body therein, prevent
Only ceramic body is damaged.It is further preferred that buffer is water, naturally it is also possible to be other cleaning agents.
Preferably, collection device 50 and vibrator supply device 10 are arranged along airflow direction.
Preferably, the air-flow applied from a side of mixture to mixture is horizontal gas flow.
Preferably, the flow velocity of the air-flow applied from a side of mixture to mixture is 16 meter per seconds~25 meter per seconds.
It should be noted that the air-flow applied from a side of mixture to mixture can be provided by other devices, it is not limited to
For air blower.
Two external electrodes are enclosed in two end faces of S90, the respectively ceramic body after chamfering, obtain multilayer ceramic capacitor.
The operation of two external electrodes is enclosed in two end faces of the ceramic body after chamfering respectively specifically: 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~810 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.
In the preparation method of this multilayer ceramic capacitor, the averag density of ceramic body is about with the content difference of copper
4.6g/cm3-5.4g/cm3, and the density of quartz sand is about 2.65g/cm3, with the density contrast of ceramic body away from significant, therefore gas
After stream acts on mixture, due to the volume sizableness of ceramic body and quartz sand, the wind-force size phase of the two is acted on
When, but the two density difference is larger, under identical wind-force, ceramic body is due to heavier, and the displacement along wind direction is smaller, quartz sand
Due to relatively light, the displacement along wind direction is larger, thus separation of ceramic body and quartz sand, so that being sorted to the ceramic body after chamfering
More convenient, multilayer ceramic capacitor size obtained is small and electrode in being made using copper, therefore with extremely low equivalent
Series resistance is suitable for frequency applications field.
It should be noted that step S10~S50 can be omitted, existing ceramic body is directlyed adopt at this time, it can also be with
Ceramic body is prepared using other methods.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (9)
1. a kind of preparation method of multilayer ceramic capacitor, which comprises the steps of:
Prepare ceramic body；
Chamfered is carried out to the ceramic body using the abrasive media comprising quartz sand；
Drying obtains mixture after the ceramic body after the abrasive media and chamfering is carried out crude separation using sieve, described
Mixture include ceramic body and with the comparable quartz sand of ceramic body volume；
By the mixture from sustained height free-falling, apply stable and uniform from a side of the mixture to the mixture
Air-flow by the ceramic body and the quartzy sand separation；The air-flow is horizontal gas flow, the flow velocity of the air-flow be 16m/s~
25m/s；And
Two external electrodes are enclosed in two opposite end faces of the ceramic body respectively after chamfering, obtain multilayer ceramic capacitor；
Wherein, the ceramic body preparation the following steps are included:
Ceramic powder, adhesive, organic solvent are obtained into ceramic slurry after mixing, then using the ceramic slurry as raw material system
It is standby to obtain ceramic membrane；
Electrode pattern in being formed on the ceramic membrane using copper metal slurry, obtains the ceramic thin for being printed with interior electrode pattern
Film；
Multiple ceramic film poststacks for being printed with interior electrode pattern are obtained into lamination unit, then in the lamination unit
Multiple ceramic membranes are laminated in two opposite surfaces respectively, obtain multilayer board；
To be cut after multilayer board pressing, and obtain laminated body, the length of laminated body and it is wide be respectively 1.1mm~1.2mm and
0.52mm~0.62mm, or respectively 0.62mm~0.68mm and 0.28mm~0.34mm；And
The laminated body is carried out to arrange viscous and sintering, obtains the ceramic body.
2. the preparation method of multilayer ceramic capacitor as described in claim 1, which is characterized in that the abrasive media includes oxygen
Change aluminium ball, quartz sand, alumina powder and deionized water.
3. the preparation method of multilayer ceramic capacitor as described in claim 1, which is characterized in that by the mixture from same
Height free-falling applies the air-flow of stable and uniform from a side of the mixture to the mixture for the ceramic body and institute
In the step of stating quartzy sand separation, the mixture is placed on vibrator supply device, is carried out by vibrator supply device continuous
Feed, falls mixture successively uniformly from sustained height.
4. the preparation method of multilayer ceramic capacitor as claimed in claim 3, which is characterized in that by the mixture from same
Height free-falling applies the air-flow of stable and uniform from a side of the mixture to the mixture for the ceramic body and institute
In the step of stating quartzy sand separation, by the way that air blower is arranged in the lower section of the vibrator supply device, thus from the mixture
Side to the mixture apply stable and uniform air-flow.
5. the preparation method of multilayer ceramic capacitor as claimed in claim 4, which is characterized in that the air blower is mixed from described
It closes a side of object and applies the horizontal gas flow of stable and uniform for the ceramic body and the quartzy sand separation to the mixture.
6. the preparation method of multilayer ceramic capacitor as described in claim 1, which is characterized in that in the ceramic slurry, institute
The mass ratio for stating ceramic powder, described adhesive and the organic solvent is 10:3~5:6~9, the main component of the ceramic powder
For calcium zirconate or strontium zirconate, described adhesive is polyvinyl butyral；The organic solvent is that mass ratio is 1~1.5:1's
The mixture of toluene and ethyl alcohol.
7. the preparation method of multilayer ceramic capacitor as described in claim 1, which is characterized in that the shape on the ceramic membrane
It at interior electrode pattern, obtains in the step of being printed with the ceramic membrane of interior electrode pattern, electrode size is printed on the pottery
The interior electrode pattern is formed on porcelain film, the printing selects silk-screen printing technique.
8. the preparation method of multilayer ceramic capacitor as described in claim 1, which is characterized in that it is described to the laminated body into
Row is arranged in viscous and sintering operation, the detailed process that the row glues are as follows: under protective gas atmosphere, the laminated body is heated
To 400 DEG C~600 DEG C and 3h~6h is kept the temperature to exclude described adhesive；The detailed process of the sintering are as follows: in reducibility gas
Under atmosphere, it is heated to 980 DEG C~1050 DEG C by the laminated body of the row after viscous and keeps the temperature 1.5h~3h to be sintered.
9. the preparation method of multilayer ceramic capacitor as described in claim 1, which is characterized in that described respectively after chamfering
Enclose the operation of two external electrodes in two end faces of the ceramic body specifically: two of the ceramic body after chamfering respectively
End face coated copper metal paste, under protective gas atmosphere, the ceramic body for being coated with copper metal slurry is heated to 750
DEG C~810 DEG C and 10min~12min is kept the temperature with sintered copper metal paste, it is formed after sintering and is adhering closely to the ceramics respectively
Two external electrodes of two end faces of body.
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| CN106952995A (en) * | 2017-03-24 | 2017-07-14 | 芜湖聚飞光电科技有限公司 | A kind of manufacture method of LED lamp bead |
| CN107195458A (en) * | 2017-06-06 | 2017-09-22 | 中国振华(集团)新云电子元器件有限责任公司(国营第四三二六厂) | It is a kind of to reduce the radio frequency multilayer ceramic capacitor chamfer angle technique of equivalent series resistance |
| CN112071642B (en) * | 2020-08-26 | 2021-09-17 | 广东风华高新科技股份有限公司 | Preparation method of multilayer ceramic capacitor |
| CN112185706B (en) * | 2020-09-09 | 2022-03-04 | 广东风华高新科技股份有限公司 | Method for manufacturing multilayer ceramic capacitor and multilayer ceramic capacitor |
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| CN1298788A (en) * | 1999-12-03 | 2001-06-13 | 株式会社村田制作所 | Method for preparing ceramic mud, ceramic blank and producing single pieces ceramic electronic elements |
| EP1695947A1 (en) * | 2005-01-26 | 2006-08-30 | E.I.Du pont de nemours and company | Multi-component LTCC substrate with a core of high dielectric constant ceramic material and processes for the development thereof |
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