CN104098337A - Method for molding integrated coaxial medium filter - Google Patents
Method for molding integrated coaxial medium filter Download PDFInfo
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- CN104098337A CN104098337A CN201410320880.0A CN201410320880A CN104098337A CN 104098337 A CN104098337 A CN 104098337A CN 201410320880 A CN201410320880 A CN 201410320880A CN 104098337 A CN104098337 A CN 104098337A
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Abstract
The invention discloses a method for molding an integrated coaxial medium filter. The method comprises the following steps: preparing ceramic membranes by adopting the roll forming method; laminating the ceramic membranes; heating and pressurizing the laminated ceramic membranes to enable the membranes to be cohesively combined into a compact green block; performing mechanical operations, such as cutting and boring, on the green block according to the filter structure to be designed; finally, tapping and sintering the ceramic green bodies. Compared with dry-pressing formation, steel dies with complicated structures are not needed, so that the shortcomings that die processing is difficult and high in cost, demoulding is difficult after formation, and blank bodies are fragile are avoided. According to the invention, as the content of polyvinyl alcohol in the green bodies of the medium filter is relatively high, the ductility of the green bodies is high, the probability of breakage is low, mechanical treatment can be easily realized before sintering, the ceramic part green bodies with complicated structures can be flexibly manufactured, and the production efficiency and the yield can be effectively improved. Compared with the gel injection molding, the polyvinyl alcohol, glycerol and other organic materials, which are used in the method, are cheap and safe, cause no harm to the human body and the environment and meet the requirement for green production.
Description
Technical field
The invention belongs to microwave ceramics and devices field, more specifically, relate to a kind of forming method of body-lined type coaxial dielectric wave filter base substrate.
Background technology
Wave filter is widely used in microwave/radio circuit, and the quality of its performance directly has influence on the performance of system.Current wireless communication technique fast development, more and more higher to the requirement of wave filter miniaturization, compatibility.Body-lined type dielectric filter and duplexer are rectangular parallelepiped medium block upper surfaces to lower surface with the through hole of series of parallel as resonator, medium block surface is coated with metal electrode pattern as inductance capacitance coupling between input and output coupling resonator, compare and do not need extra coupled structure with traditional coaxial filter, meet the requirement of miniaturization, and Q value is high, insertion loss is low, be subject to paying attention to widely.On medium block, through hole number is that resonator number is more, and wave filter attenuation outside a channel is better, and frequency characteristic more approaches rectangle, but increasing of through hole can cause device difficult forming.At present, conventional coaxial dielectric wave filter forming method is dry-pressing powder compacting and gel casting forming.
Dry-pressing powder compacting is to pack the powder through granulation, good fluidity into mould, along the pressurization of single shaft direction, powder pressing is become to the base substrate of definite shape.It is high that base substrate has density, and sintering shrinkage is little, and regular shape is the advantage such as flexible type not, but need to make steel die according to device architecture, because device size is little, complex structure, Mould Machining is difficult, cost is high, in actually operating, demoulding difficulty, base substrate are easily broken, and efficiency is low, and yield rate is low.
Gel casting forming is in the pulp suspension of low viscosity high solid loading, to add a small amount of organic monomer, then utilize and facilitate agent and initiator, make the organic monomer polymerization crosslinking in suspensoid form tridimensional network, thereby make the moulding of liquid slurry in-situ solidifying.Gel casting forming is less demanding to mould, the pottery of plastic complex construction, and wet base intensity is higher, the easily demoulding, green compact plasticity is better, can carry out mechanical workout.The organic monomer acrylamide using in gel casting forming, linking agent N, N '-methylene-bisacrylamide, catalyst n, N, N ', the organic solvents such as N '-Tetramethyl Ethylene Diamine are toxic substance, easy harmful to human and environment during scale operation.
Summary of the invention
The object of the invention is for a kind of forming method of body-lined type coaxial dielectric wave filter base substrate is provided, if be intended to, solve existing body-lined type coaxial dielectric wave filter and adopt that dry-pressing powder compacting causes operational difficulty, efficiency is low, yield rate is low; If adopt gel casting forming to cause the technical problem of using organism harmful to human body environment.
The forming method of body-lined type coaxial dielectric wave filter base substrate provided by the invention, comprises the steps:
(1) polyvinyl alcohol is joined to slowly heating in deionized water, after polyvinyl alcohol dissolves completely, add glycerine to stir, and insulation is until form and roll film fluidizer solution after solution clarification;
(2) rolling film described in adding in ceramic powder forms after evenly and mixes pug by fluidizer solution stirring, and described mixing pug is poured on roll forming machine roll and is mixed, mix moisture in pug and evaporate gradually, until compound can monoblock take off from roll, form even mixture block;
(3) described even mixture block is placed on described roll forming machine roll and rolls out primary diaphragm, described primary diaphragm is folded and do 90 ° and be again placed on rolling on described roll forming machine roll after swinging to; Repeat above-mentioned steps until even, surperficial a certain size the secondary diaphragm that cuts into without decorative pattern and after discharging bubble of diaphragm rolling out;
(4) reduce the spacing between two rolls of roll forming machine, and described secondary diaphragm is placed on to repeat-rolling on roll forming machine roll, obtain even thickness, tertiary membrane sheet that snappiness is good;
(5) be stacked to desired thickness L after described tertiary membrane sheet is dried, and on thermocompressor heating and pressurizing, make diaphragm after the lamination formation blank stock of combining closely; Desired thickness
f is the mid-frequency of wave filter, and ε is material dielectric constant;
(6) after being cut, punched by predefined size, described blank stock obtains wave filter ceramic green;
(7) described wave filter ceramic green is carried out after binder removal and sintering processes, obtain body-lined type coaxial dielectric wave filter base substrate.
Wherein, in step (1), the mass percent of described polyvinyl alcohol, described deionized water and described glycerine is respectively (15%～25%), (60%～75%) and (10%～15%).
Wherein, in step (2), ceramic powder is (Mg
0.95ca
0.05)
0.9zn
0.1tiO
3ceramic powder or Ba (Co
0.8zn
0.2)
1/3nb
2/3o
3ceramic powder; Described ceramic powder with described in to roll film be (100: 40)～(100: 25) with the mass ratio of fluidizer solution.
Wherein, binder removal and sintering processes are divided into 4 stages and carry out in step (7), the first stage: be warming up to 250 ℃～350 ℃ from room temperature by 1～2 ℃/min, be incubated 120min; Subordinate phase: be warming up to 550 ℃ by 2 ℃/min, insulation 60min; Phase III: be warming up to ceramic powder sintering temperature by 5 ℃/min, insulation 180min; Fourth stage: be cooled to room temperature.
The present invention compares with dry-pressing formed, does not need the steel die of complex construction, has avoided that Mould Machining is difficult, cost is high, demoulding difficulty, the frangible shortcoming of base substrate after moulding.The roll forming machine that invention is used is simple to operate, does not need extra artificial training, has avoided high installation cost and artificial training expenses, has effectively reduced production cost.The dielectric filter green compact that the present invention makes are because polyvinyl alcohol content is higher, make green compact toughness high, be difficult for fragmentation, and before sintering, easily carry out mechanical workout, can make flexibly the ceramic component green compact of complex construction, can effectively boost productivity, yield rate.Compare with gel casting forming, the organism such as the polyvinyl alcohol that the present invention uses, glycerine, cheap safety, all harmless to human body and environment, meet the requirement that greenization is produced.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the inventive method;
Fig. 2 is body-lined type coaxial dielectric filter construction schematic diagram, and 1 is rectangular parallelepiped medium block, and 2 is cylindrical hole, and L is thickness.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The forming method that the invention provides a kind of body-lined type coaxial dielectric wave filter base substrate, the method comprises the steps:
The 1st step, adds slowly heating in deionized water by polyvinyl alcohol, after polyvinyl alcohol dissolves completely, adds glycerine to stir, and insulation is until form and roll film fluidizer after solution clarification.
The 2nd step, after adding above-mentioned fluidizer solution stirring evenly in ceramic powder, form and mix pug, and described mixing pug is poured on roll forming machine roll and is mixed, mix moisture in pug and evaporate gradually, until compound can monoblock take off from roll, form even mixture block.
The 3rd step, is placed on described even mixture block after rolling out thicker diaphragm on described roll forming machine roll and takes off, and described thicker diaphragm is folded and does 90 ° and be again placed on rolling on described roll forming machine roll after swinging to; Repeat above-mentioned steps until the diaphragm rolling out evenly, surface is without decorative pattern and discharge bubble, finally cut into a certain size compared with thick film sheet.
The 4th step, reduces the spacing between two rolls of roll forming machine, and by described a certain size compared with thick film sheet, be placed on repeat-rolling on roll forming machine roll, obtain even thickness, diaphragm that snappiness is good.
The 5th step, is stacked to desired thickness L after described even thickness, diaphragm that snappiness is good are dried, and on thermocompressor heating and pressurizing, make diaphragm after the lamination formation blank stock of combining closely.Wherein, desired thickness is basis
determine, f is filter mid-frequency, and ε is material dielectric constant.
The 6th step, obtains wave filter ceramic green after described blank stock is cut, punched by the size of setting;
The 7th step, carries out described wave filter ceramic green to obtain body-lined type coaxial dielectric wave filter base substrate after binder removal and sintering processes, as shown in Figure 2, and for upper surface arrives lower surface with the rectangular parallelepiped medium block of series of parallel through hole 2.
Preferably, in the 1st step, polyvinyl alcohol alcoholysis degree is 88%, now water-soluble best, in warm water, can dissolve well, and viscosity is 20.5～24.5mPas (4% aqueous solution, 20 ℃), and molecular-weight average is 88000.Polyvinyl alcohol molecule amount excessive between carbochain molecule contact too tight, can make the diaphragm that shuts out flexible; If molecular weight is too small, carbochain is short, intensity is low, and fragility is large, and both of these case is all unfavorable for rolling formation.The mass ratio of polyvinyl alcohol, deionized water, glycerine is respectively 15%～25%, 60%～75%, 10%～15%.Polyvinyl alcohol content is too low, and solution bounding force is inadequate, and film forming properties is poor; Too high levels, after sintering, ceramic dense degree is poor.Glycerol content is very few, poor plasticity; Too high levels, pug has the elasticity that rubber is the same, cannot rolling formation.
Preferably, in the 2nd step, the mass ratio of ceramic powder and the 1st step configuration fluidizer solution is 100: 40～100: 25, fluidizer solution is very few, the dry decorative pattern shape crackle that there will be of membrane surface while rolling film, when solution too much rolls film, in solution, the moisture evaporation time increases, and diaphragm solid content also can reduce, and after sintering, porcelain piece is loose.Ceramic powder kind is definite according to the specific inductivity of filter material, for example (Mg
0.95ca
0.05)
0.9zn
0.1tiO
3, Ba (Co
0.8zn
0.2)
1/3nb
2/3o
3ceramic powder.
Preferably, in the 7th step, because polyvinyl alcohol content in base substrate is higher, the intensification of binder removal stage is too fast can ftracture, bubble, therefore heat-up rate should be suitably slow.Binder removal sintering is divided into 4 stages to carry out, the first stage: from room temperature, by 1～2 ℃/min, be warming up to 250 ℃～350 ℃, insulation 120min; Subordinate phase: be warming up to 550 ℃ by 2 ℃/min, insulation 60min; Phase III: be warming up to ceramic powder sintering temperature by 5 ℃/min, insulation 180min; Fourth stage: be cooled to room temperature.
The above technical scheme of conceiving by the present invention, compares with dry-pressing formed, does not need the steel die of complex construction, has avoided that Mould Machining is difficult, cost is high, demoulding difficulty, the frangible shortcoming of base substrate after moulding.The roll forming machine that invention is used is simple to operate, does not need extra artificial training, has avoided high installation cost and artificial training expenses, has effectively reduced production cost.The dielectric filter green compact that the present invention makes are because polyvinyl alcohol content is higher, make green compact toughness high, be difficult for fragmentation, and before sintering, easily carry out mechanical workout, can make flexibly the ceramic component green compact of complex construction, can effectively boost productivity, yield rate.Compare with gel casting forming, the organism such as the polyvinyl alcohol that the present invention uses, glycerine, cheap safety, all harmless to human body and environment, meet the requirement that greenization is produced.
The present invention is applied to rolling formation method the moulding of dielectric filter, diaphragm through the doubling repeatedly of roll roll practice after homogeneity, density better, it is little that the wave filter green sintering of preparing shrinks deformation, the less investment of secondary processing.After adjusting the ratio of polyvinyl alcohol, deionized water, glycerine, applicable to different sorts microwave-medium ceramics system, can not increase because of the change of material extra cost.
The forming method of the body-lined type coaxial dielectric wave filter providing for the further description embodiment of the present invention, below in conjunction with specific examples, details are as follows:
Embodiment 1:
The 1st step: 25g polyvinyl alcohol is added to slowly heating in 63g deionized water, add 12g glycerine to stir after polyvinyl alcohol dissolves completely, insulation is until form and roll film fluidizer after solution clarification.
The 2nd step: at 100g (Mg
0.95ca
0.05)
0.9zn
0.1tiO
3after adding the above-mentioned fluidizer solution stirring of 40g evenly in ceramic powder, form and mix pug, and described mixing pug is poured on roll forming machine roll and is mixed, mix moisture in pug and evaporate gradually, until compound can monoblock take off from roll, form even mixture block.
The 3rd step, is placed on described even mixture block after rolling out thicker diaphragm on described roll forming machine roll and takes off, and described thicker diaphragm is folded and does 90 ° and be again placed on rolling on described roll forming machine roll after swinging to; Repeat above-mentioned steps until the diaphragm rolling out evenly, surface is without decorative pattern and discharge bubble, finally cut into a certain size compared with thick film sheet.
The 4th step: reduce the spacing between two rolls of roll forming machine, and by described a certain size compared with thick film sheet, be placed on repeat-rolling on roll forming machine roll, obtain even thickness, diaphragm that snappiness is good.
The 5th step: described even thickness, diaphragm that snappiness is good are dried and be stacked to desired thickness L, and heating and pressurizing on thermocompressor, makes diaphragm after the lamination formation blank stock of combining closely.Wherein, desired thickness is basis
determine, f is filter mid-frequency, and ε is material dielectric constant.
The 6th step, obtains wave filter ceramic green after described blank stock is cut, punched by the size of setting.
The 7th step, carries out described wave filter ceramic green to obtain body-lined type coaxial dielectric wave filter base substrate after binder removal and sintering processes, as shown in Figure 2, and for upper surface arrives lower surface with the rectangular parallelepiped medium block of series of parallel through hole 2.Wherein, binder removal and sintering are divided into 4 stages, the first stage: from room temperature, by 1 ℃/min, be warming up to 300 ℃, insulation 120min; Subordinate phase: be warming up to 550 ℃ by 2 ℃/min again, insulation 60min; Phase III: be warming up to 1300 ℃ by 5 ℃/min, insulation 180min; Fourth stage: be cooled to room temperature.
Embodiment 2:
The 1st step: 20g polyvinyl alcohol is added to slowly heating in 65g deionized water, add 10g glycerine to stir after polyvinyl alcohol dissolves completely, insulation is until form and roll film fluidizer after solution clarification.
The 2nd step: at 100g (Mg
0.95ca
0.05)
0.9zn
0.1tiO
3after adding the above-mentioned fluidizer solution stirring of 30g evenly in ceramic powder, form and mix pug, and described mixing pug is poured on roll forming machine roll and is mixed, mix moisture in pug and evaporate gradually, until compound can monoblock take off from roll, form even mixture block.
The 3rd step, is placed on described even mixture block after rolling out thicker diaphragm on described roll forming machine roll and takes off, and described thicker diaphragm is folded and does 90 ° and be again placed on rolling on described roll forming machine roll after swinging to; Repeat above-mentioned steps until the diaphragm rolling out evenly, surface is without decorative pattern and discharge bubble, finally cut into a certain size compared with thick film sheet.
The 4th step: reduce the spacing between two rolls of roll forming machine, and by described a certain size compared with thick film sheet, be placed on repeat-rolling on roll forming machine roll, obtain even thickness, diaphragm that snappiness is good.
The 5th step: described even thickness, diaphragm that snappiness is good are dried and be stacked to desired thickness L, and heating and pressurizing on thermocompressor, makes diaphragm after the lamination formation blank stock of combining closely.Wherein, desired thickness is basis
determine, f is filter mid-frequency, and ε is material dielectric constant.
The 6th step, obtains wave filter ceramic green after described blank stock is cut, punched by the size of setting.
The 7th step, carries out described wave filter ceramic green to obtain body-lined type coaxial dielectric wave filter base substrate after binder removal and sintering processes, as shown in Figure 2, and for upper surface arrives lower surface with the rectangular parallelepiped medium block of series of parallel through hole 2.Wherein, binder removal and sintering are divided into 4 stages, the first stage: from room temperature, by 2 ℃/min, be warming up to 250 ℃, insulation 120min; Subordinate phase: be warming up to 550 ℃ by 2 ℃/min again, insulation 60min; Phase III: be warming up to 1300 ℃ by 5 ℃/min, insulation 180min; Fourth stage: be cooled to room temperature.
Embodiment 3:
The 1st step: 15g polyvinyl alcohol is added to slowly heating in 75g deionized water, add 10g glycerine to stir after polyvinyl alcohol dissolves completely, insulation is until form and roll film fluidizer after solution clarification.
The 2nd step: at 100g (Mg
0.95ca
0.05)
0.9zn
0.1tiO
3after adding the above-mentioned fluidizer solution stirring of 35g evenly in ceramic powder, form and mix pug, and described mixing pug is poured on roll forming machine roll and is mixed, mix moisture in pug and evaporate gradually, until compound can monoblock take off from roll, form even mixture block.
The 3rd step, is placed on described even mixture block after rolling out thicker diaphragm on described roll forming machine roll and takes off, and described thicker diaphragm is folded and does 90 ° and be again placed on rolling on described roll forming machine roll after swinging to; Repeat above-mentioned steps until the diaphragm rolling out evenly, surface is without decorative pattern and discharge bubble, finally cut into a certain size compared with thick film sheet.
The 4th step: reduce the spacing between two rolls of roll forming machine, and by described a certain size compared with thick film sheet, be placed on repeat-rolling on roll forming machine roll, obtain even thickness, diaphragm that snappiness is good.
The 5th step: be stacked to desired thickness L after described even thickness, diaphragm that snappiness is good are dried, heating and pressurizing on thermocompressor, makes diaphragm after the lamination formation blank stock of combining closely.Wherein, desired thickness is basis
determine, f is filter mid-frequency, and ε is material dielectric constant.
The 6th step, obtains wave filter ceramic green after described blank stock is cut, punched by the size of setting.
The 7th step, carries out described wave filter ceramic green to obtain body-lined type coaxial dielectric wave filter base substrate after binder removal and sintering processes, as shown in Figure 2, and for upper surface arrives lower surface with the rectangular parallelepiped medium block of series of parallel through hole 2.Wherein, binder removal and sintering are divided into 4 stages, the first stage: from room temperature, by 1.5 ℃/min, be warming up to 350 ℃, insulation 120min; Subordinate phase: be warming up to 550 ℃ by 2 ℃/min again, insulation 60min; Phase III: be warming up to 1300 ℃ by 5 ℃/min, insulation 180min; Fourth stage: be cooled to room temperature.
Embodiment 4:
The 1st step: 20g polyvinyl alcohol is added to slowly heating in 65g deionized water, add 15g glycerine to stir after polyvinyl alcohol dissolves completely, insulation is until form and roll film fluidizer after solution clarification.
The 2nd step: at 100g Ba (Co
0.8zn
0.2)
1/3nb
2/3o
3after adding the above-mentioned fluidizer solution stirring of 30g evenly in ceramic powder, form and mix pug, and described mixing pug is poured on roll forming machine roll and is mixed, mix moisture in pug and evaporate gradually, until compound can monoblock take off from roll, form even mixture block.
The 3rd step, is placed on described even mixture block after rolling out thicker diaphragm on described roll forming machine roll and takes off, and described thicker diaphragm is folded and does 90 ° and be again placed on rolling on described roll forming machine roll after swinging to; Repeat above-mentioned steps until the diaphragm rolling out evenly, surface is without decorative pattern and discharge bubble, finally cut into a certain size compared with thick film sheet.
The 4th step: reduce the spacing between two rolls of roll forming machine, and by described a certain size compared with thick film sheet, be placed on repeat-rolling on roll forming machine roll, obtain even thickness, diaphragm that snappiness is good.
The 5th step: described even thickness, diaphragm that snappiness is good are dried and be stacked to desired thickness L, and heating and pressurizing on thermocompressor, makes diaphragm after the lamination formation blank stock of combining closely.Wherein, desired thickness is basis
determine, f is filter mid-frequency, and ε is material dielectric constant.
The 6th step, obtains wave filter ceramic green after described blank stock is cut, punched by the size of setting.
The 7th step, carries out described wave filter ceramic green to obtain body-lined type coaxial dielectric wave filter base substrate after binder removal and sintering processes, as shown in Figure 2, and for upper surface arrives lower surface with the rectangular parallelepiped medium block of series of parallel through hole 2.Wherein, binder removal and sintering are divided into 4 stages, the first stage: from room temperature, by 1 ℃/min, be warming up to 300 ℃, insulation 120min; Subordinate phase: be warming up to 550 ℃ by 2 ℃/min again, insulation 60min; Phase III: be warming up to 1500 ℃ by 5 ℃/min, insulation 180min; Fourth stage: be cooled to room temperature.
Embodiment 5:
The 1st step: 16g polyvinyl alcohol is added to slowly heating in 72g deionized water, add 12g glycerine to stir after polyvinyl alcohol dissolves completely, insulation is until form and roll film fluidizer after solution clarification.
The 2nd step: at 100g Ba (Co
0.8zn
0.2)
1/3nb
2/3o
3after adding the above-mentioned fluidizer solution stirring of 35g evenly in ceramic powder, form and mix pug, and described mixing pug is poured on roll forming machine roll and is mixed, mix moisture in pug and evaporate gradually, until compound can monoblock take off from roll, form even mixture block.
The 3rd step, is placed on described even mixture block after rolling out thicker diaphragm on described roll forming machine roll and takes off, and described thicker diaphragm is folded and does 90 ° and be again placed on rolling on described roll forming machine roll after swinging to; Repeat above-mentioned steps until the diaphragm rolling out evenly, surface is without decorative pattern and discharge bubble, finally cut into a certain size compared with thick film sheet.
The 4th step: reduce the spacing between two rolls of roll forming machine, and by described a certain size compared with thick film sheet, be placed on repeat-rolling on roll forming machine roll, obtain even thickness, diaphragm that snappiness is good.
The 5th step: described even thickness, diaphragm that snappiness is good are dried and be stacked to desired thickness L, and heating and pressurizing on thermocompressor, makes diaphragm after the lamination formation blank stock of combining closely.Wherein, desired thickness is basis
determine, f is filter mid-frequency, and ε is material dielectric constant.
The 6th step, obtains wave filter ceramic green after described blank stock is cut, punched by the size of setting.
The 7th step, carries out described wave filter ceramic green to obtain body-lined type coaxial dielectric wave filter base substrate after binder removal and sintering processes, as shown in Figure 2, and for upper surface arrives lower surface with the rectangular parallelepiped medium block of series of parallel through hole 2.Wherein, binder removal and sintering are divided into 4 stages, the first stage: from room temperature, by 2 ℃/min, be warming up to 350 ℃, insulation 120min; Subordinate phase: be warming up to 550 ℃ by 2 ℃/min again, insulation 60min; Phase III: be warming up to 1500 ℃ by 5 ℃/min, insulation 180min; Fourth stage: be cooled to room temperature.
The implementation step of embodiment is identical, and in polyvinyl alcohol, deionized water, glycerine, powder, fluidizer solution addition is different, under tabulate.
Wherein, ceramic powder is (Mg
0.95ca
0.05)
0.9zn
0.1tiO
3, binder removal and sintering are divided into 4 stages, the first stage: from room temperature, by 1 ℃/min, be warming up to 300 ℃, insulation 120min; Subordinate phase: be warming up to 550 ℃ by 2 ℃/min again, insulation 60min; Phase III: be warming up to 1300 ℃ by 5 ℃/min, insulation 180min; Fourth stage: be cooled to room temperature.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. a forming method for body-lined type coaxial dielectric wave filter base substrate, is characterized in that, comprises the steps:
(1) polyvinyl alcohol is joined to slowly heating in deionized water, after polyvinyl alcohol dissolves completely, add glycerine to stir, and insulation is until form and roll film fluidizer solution after solution clarification;
(2) rolling film described in adding in ceramic powder forms after evenly and mixes pug by fluidizer solution stirring, and described mixing pug is poured on roll forming machine roll and is mixed, mix moisture in pug and evaporate gradually, until compound can monoblock take off from roll, form even mixture block;
(3) described even mixture block is placed on described roll forming machine roll and rolls out primary diaphragm, described primary diaphragm is folded and do 90 ° and be again placed on rolling on described roll forming machine roll after swinging to; Repeat above-mentioned steps until even, surperficial a certain size the secondary diaphragm that cuts into without decorative pattern and after discharging bubble of diaphragm rolling out;
(4) reduce the spacing between two rolls of roll forming machine, and described secondary diaphragm is placed on to repeat-rolling on roll forming machine roll, obtain even thickness, tertiary membrane sheet that snappiness is good;
(5) be stacked to desired thickness L after described tertiary membrane sheet is dried, and on thermocompressor heating and pressurizing, make diaphragm after the lamination formation blank stock of combining closely; Desired thickness
f is the mid-frequency of wave filter, and ε is material dielectric constant;
(6) after being cut, punched by predefined size, described blank stock obtains wave filter ceramic green;
(7) described wave filter ceramic green is carried out after binder removal and sintering processes, obtain body-lined type coaxial dielectric wave filter base substrate.
2. forming method as claimed in claim 1, it is characterized in that, in step (1), the mass percent of described polyvinyl alcohol, described deionized water and described glycerine is respectively (15%～25%), (60%～75%) and (10%～15%).
3. forming method as claimed in claim 2, is characterized in that, in step (2), ceramic powder is (Mg
0.95ca
0.05)
0.9zn
0.1tiO
3ceramic powder or Ba (Co
0.8zn
0.2)
1/3nb
2/3o
3ceramic powder; Described ceramic powder with described in to roll film be (100: 40)～(100: 25) with the mass ratio of fluidizer solution.
4. the forming method as described in claim 1-3 any one, is characterized in that, binder removal and sintering processes are divided into 4 stages and carry out in step (7), the first stage: be warming up to 250 ℃～350 ℃ from room temperature by 1～2 ℃/min, be incubated 120min; Subordinate phase: be warming up to 550 ℃ by 2 ℃/min, insulation 60min; Phase III: be warming up to ceramic powder sintering temperature by 5 ℃/min, insulation 180min; Fourth stage: be cooled to room temperature.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106891420A (en) * | 2017-02-20 | 2017-06-27 | 广东东方锆业科技股份有限公司 | A kind of method that rolling formation makes zirconia ceramic product |
| CN108461293A (en) * | 2018-04-09 | 2018-08-28 | 广东风华高新科技股份有限公司 | A kind of manufacturing method of ceramic capacitor |
| CN109509941A (en) * | 2018-11-01 | 2019-03-22 | 京信通信系统（中国）有限公司 | The production method of dielectric waveguide filter and its substrate |
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| CN106891420A (en) * | 2017-02-20 | 2017-06-27 | 广东东方锆业科技股份有限公司 | A kind of method that rolling formation makes zirconia ceramic product |
| CN108461293A (en) * | 2018-04-09 | 2018-08-28 | 广东风华高新科技股份有限公司 | A kind of manufacturing method of ceramic capacitor |
| CN108461293B (en) * | 2018-04-09 | 2020-10-09 | 广东风华高新科技股份有限公司 | Method for manufacturing ceramic capacitor |
| CN109509941A (en) * | 2018-11-01 | 2019-03-22 | 京信通信系统（中国）有限公司 | The production method of dielectric waveguide filter and its substrate |
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