CN104098330B - Post growth annealing is adopted to prepare the method for high-performance barium strontium titanate pyroelectric ceramics - Google Patents
Post growth annealing is adopted to prepare the method for high-performance barium strontium titanate pyroelectric ceramics Download PDFInfo
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- 229910052454 barium strontium titanate Inorganic materials 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000000919 ceramic Substances 0.000 title claims abstract description 43
- 238000000137 annealing Methods 0.000 title claims abstract description 39
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 30
- 239000001301 oxygen Substances 0.000 claims abstract description 30
- 238000005245 sintering Methods 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims description 26
- 238000000498 ball milling Methods 0.000 claims description 24
- 238000000227 grinding Methods 0.000 claims description 19
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000010792 warming Methods 0.000 claims description 10
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 9
- 229940068984 polyvinyl alcohol Drugs 0.000 claims description 9
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 239000011230 binding agent Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims description 7
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 4
- 230000032683 aging Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000005056 compaction Methods 0.000 claims description 4
- 238000005469 granulation Methods 0.000 claims description 4
- 230000003179 granulation Effects 0.000 claims description 4
- 238000003786 synthesis reaction Methods 0.000 claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 3
- 230000029087 digestion Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000010298 pulverizing process Methods 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 230000005684 electric field Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000011031 large-scale manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 235000015895 biscuits Nutrition 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
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Abstract
The present invention relates to the method adopting post growth annealing to prepare high-performance barium strontium titanate pyroelectric ceramics, anneal through sintering the barium-strontium titanate ceramic obtained under oxygen atmosphere, annealing temperature is 800 ~ 1250 DEG C, and annealing time is 2 ~ 5 hours, can obtain high-performance barium strontium titanate pyroelectric ceramics.The present invention by carrying out after annealing process to it after the obtained barium-strontium titanate ceramic of sintering, and can obtain high performance barium strontium titanate pyroelectric ceramics, its dielectric constant is high, and can reach more than 9500, pyroelectric coefficient is high, can reach 18 × 10
-8c/cm
2more than K, and sample purity is high, performance is high, uniformity is good, can meet the requirement making non-refrigerating infrared focal plane device, efficiently solves the problem that BST pottery is difficult to sinter to high-compactness.
Description
Technical field
The present invention relates to a kind of method adopting post growth annealing to prepare high-performance BST pyroelectric ceramics, belong to pyroelectric ceramic material technical field.
Background technology
Barium strontium titanate (Ba
xsr
1-xtiO
3(0<x<1), BST) Curie temperature is adjustable, dielectric loss is low, process the features such as easy owing to having for ceramic material, becomes the important candidate material of thermoelectric type non-refrigerating infrared focal plane.
BST pyroelectric ceramics is when being made into non-refrigerating infrared focal plane device, what adopt is novel dielectric mode of operation, namely near Curie temperature (Curie temperature is in room temperature) is operated in, and apply certain direct current biasing electric field, its intrinsic pyroelectric effect and field can be utilized like this to cause pyroelectric effect (rate of change of dielectric constant with temperature), and formula (1) shows its pyroelectric coefficient simultaneously:
In formula, p is pyroelectric coefficient, and D is electric displacement, p
0for intrinsic pyroelectric coefficient, E is added electric field, and T is temperature, ε
0for permittivity of vacuum, ε is relative dielectric constant.As can be seen from formula, the dielectric constant of pottery is higher, and pyroelectric coefficient is larger, is more conducive to its application.Therefore, high-k, the practical application of high pyroelectric coefficient to BST pyroelectric ceramics are extremely important.
But generally, the BST pottery adopting common process to prepare, its dielectric constant is not high, pyroelectric coefficient is also on the low side.Therefore, how effectively improving dielectric constant and the pyroelectric coefficient of BST pottery, make BST pottery meet the requirement making non-refrigerating infrared focal plane device, is a technical bottleneck in the research of current BST pyroelectric ceramics.
Summary of the invention
Being difficult to prepare the problem of high-performance BST pyroelectric ceramics for solving prior art, the invention provides a kind of method adopting post growth annealing to prepare high-performance BST pyroelectric ceramics, to meet current non-refrigerating infrared focal plane device to the requirement of BST material.
At this, the invention provides a kind of method adopting post growth annealing to prepare high-performance barium strontium titanate pyroelectric ceramics, anneal through sintering the barium-strontium titanate ceramic obtained under oxygen atmosphere, annealing temperature is 800 ~ 1250 DEG C, annealing time is 2 ~ 5 hours, can obtain high-performance barium strontium titanate pyroelectric ceramics.
The present invention by carrying out after annealing process to it after the obtained barium-strontium titanate ceramic of sintering, and can obtain high performance barium strontium titanate pyroelectric ceramics, its dielectric constant is high, and can reach more than 9500, pyroelectric coefficient is high, can reach 18 × 10
- 8c/cm
2more than K, and sample purity is high, performance is high, uniformity is good, can meet the requirement making non-refrigerating infrared focal plane device, efficiently solves the problem that BST pottery is difficult to sinter to high-compactness.
Preparation method of the present invention have technique simple, without the need to special installation, low cost and other advantages, be applicable to large-scale production, industrialization demand can be met.
Preferably, in described annealing, the speed of 1 ~ 4 DEG C/min rises to described annealing temperature.
Preferably, in described annealing, the flow passing into oxygen is 1 ~ 3L/ minute.
The null field relative dielectric constant peak value >9800 of the high-performance barium strontium titanate pyroelectric ceramics obtained by the present invention, pyroelectric coefficient peak value >18 × 10
-8c/cm
2k.
Preferably, describedly to be obtained through sintering the barium-strontium titanate ceramic that obtains by following steps:
A) BaCO of stoichiometric proportion is taken according to the chemical formula of high-performance barium strontium titanate pyroelectric ceramics to be prepared
3, SrCO
3, TiO
2the oxide of powder and doped chemical and/or carbonate powder, make all powders mix by wet ball grinding technique and obtain raw mixture;
B) briquetting after the raw mixture of gained being dried, synthesize in atmosphere, synthesis temperature is 1000 ~ 1200 DEG C, and temperature retention time is 1 ~ 3 hour, obtains barium strontium titanate block;
C) by step b) the barium strontium titanate block that obtains carries out pulverizing, sieving, make powder refining by wet ball grinding technique, discharging post-drying, add the binding agent of ormal weight, through granulation, ageing, sieve after precompressed again, isostatic compaction, plastic removal, obtained barium strontium titanate base substrate;
D) by step c) the barium strontium titanate base substrate that obtains sinters under oxygen atmosphere, and sintering temperature is 1350 ~ 1450 DEG C, and temperature retention time is 1 ~ 5 hour, namely obtained described through sintering the barium-strontium titanate ceramic obtained.
Wherein, described doped chemical can comprise at least one in Ca, Y, Mn, Sm and Fe.
Preferably, step a) in wet ball grinding process conditions be: material is 1:(1.0 ~ 2.0 with the mass ratio of ball-milling medium and deionized water): (1.0 ~ 1.5), Ball-milling Time is 12 ~ 26 hours, and described ball-milling medium is agate ball.
Preferably, step b) in, after the drying, add the deionized water of total powder 4% ~ 10% quality before briquetting.
Preferably, step c) in, barium-strontium titanate powder crosses 40 mesh sieves before carrying out wet ball grinding.
Preferably, step c) in, described wet ball grinding process conditions are: material is 1:(1.5 ~ 2.0 with the mass ratio of ball-milling medium and deionized water): (0.5 ~ 1.0), Ball-milling Time is 24 ~ 48 hours, and described ball-milling medium is agate ball.
Preferably, described binding agent to be mass concentration be 2% ~ 5% polyvinyl alcohol (PVA) solution, the addition of poly-vinyl alcohol solution is 2% ~ 5% of barium-strontium titanate powder quality.
Preferably, step c) in, digestion time is 22 ~ 26 hours.
Preferably, step c) in, plastic removal temperature is 750 ~ 850 DEG C.
Preferably, steps d) in, the process conditions of described sintering are: heat up with the speed of 1 ~ 4 DEG C/min, start logical oxygen when being warming up to 800 ~ 1000 DEG C, oxygen flow is 1 ~ 3L/ minute; When being warming up to 1350 ~ 1450 DEG C, be incubated 1 ~ 5 hour; Cool to room temperature with the furnace, close oxygen, obtain barium-strontium titanate ceramic.
By method of the present invention, the BST pyroelectric ceramics that dielectric constant is high, pyroelectric coefficient is high can be prepared, thus meet current non-refrigerating infrared focal plane device to the requirement of BST material.
Accompanying drawing explanation
Fig. 1 is the obtained BST pottery of embodiment 1 and embodiment 2 and the change curve comparison diagram of unannealed sample (comparative example 1) dielectric constant with temperature under applying direct current electric field;
Fig. 2 is the ceramic pyroelectric coefficient variation with temperature curve comparison figure adopting Quasi-static Method to test under applying direct current electric field with unannealed sample (comparative example 1) of BST that embodiment 1 and embodiment 2 obtain.
Embodiment
Below provide embodiment and further illustrate the present invention by reference to the accompanying drawings, should be understood that following execution mode is only for illustration of the present invention, and unrestricted the present invention.
The present invention adopts post growth annealing to prepare high-performance barium strontium titanate (BST) pyroelectric ceramics.After annealing atmosphere can be oxygen, and annealing temperature can be 800 ~ 1250 DEG C, and annealing time can be 2 ~ 5 hours.
In after annealing, described annealing temperature can be risen to the speed of 1 ~ 4 DEG C/min.In addition, in after annealing, the flow passing into oxygen can be 1 ~ 3L/ minute.
The material carrying out after annealing process can be through sintering the barium-strontium titanate ceramic obtained.Before after annealing process, by barium-strontium titanate ceramic through techniques such as cutting, grinding and polishings, the size of needs can also be processed into.
In one example, the process conditions of described after annealing process are: heat up with the speed of 1 ~ 4 DEG C/min, and pass into oxygen, oxygen flow is 1 ~ 3L/ minute; When being warming up to 800 ~ 1250 DEG C, be incubated 2 ~ 5 hours; Cool to room temperature with the furnace, close oxygen, high-performance BST pottery can be obtained.
Fig. 1 illustrates the change curve comparison diagram of the BST pottery that the present invention obtains and unannealed sample dielectric constant with temperature under applying direct current electric field, and Fig. 2 illustrates the pyroelectric coefficient variation with temperature curve comparison figure that the BST pottery that the present invention obtains adopts Quasi-static Method to test with unannealed sample under applying direct current electric field.As seen from Figure 1, Figure 2, the BST pyroelectric ceramics prepared of the present invention is adopted to have high (pyroelectric coefficient >18 × 10 under 850V/mm of dielectric constant high (relative dielectric constant >9800), pyroelectric coefficient
-8ccm
-2k
-1) advantage, the sample of annealing at two temperature can improve 22% and 38%, 13% and 25% respectively than unannealed sample permittivity, pyroelectric coefficient, and increasing degree is very large, is conducive to very much its application at non-refrigerating infrared focal plane.
Should be understood that barium strontium titanate (BST) the pyroelectric ceramics composition described in the present invention is not limit, such as, can be unadulterated barium strontium titanate (Ba
xsr
1-xtiO
3(0<x<1), BST), also can be the barium strontium titanate of doping, wherein doped chemical includes but not limited at least one in Ca, Y, Mn, Sm and Fe.
The described preparation method through sintering the barium-strontium titanate ceramic obtained does not limit, such as, can make with the following method:
A) first according to Formula B a
xsr
1-xtiO
3take the BaCO of stoichiometric proportion
3, SrCO
3and TiO
2powder, makes all powders mix by wet ball grinding technique, can add doped chemical in general formula, and as Ca, Y, Mn, Sm, Fe etc., doped chemical such as can add with the form of oxide and/or carbonate;
B) briquetting after drying, synthesize in atmosphere, synthesis temperature is 1000 ~ 1200 DEG C, and temperature retention time is 1 ~ 3 hour, obtains BST block;
C) by step b) the BST block that obtains carries out pulverizing, sieving, and makes powder refining by wet ball grinding technique;
D) discharging post-drying, adds a certain amount of binding agent, through granulation, ageing, sieve after precompressed again, isostatic compaction, plastic removal, obtained BST idiosome;
E) by steps d) the BST base substrate that obtains sinters under oxygen atmosphere, and sintering process conditions is: heat up with the speed of 1 ~ 4 DEG C/min, start logical oxygen when being warming up to 800 ~ 1000 DEG C, oxygen flow is 1 ~ 3L/ minute; When being warming up to 1350 ~ 1450 DEG C, be incubated 1 ~ 5 hour; Cool to room temperature with the furnace, close oxygen, obtain BST pottery.
Step a) in wet ball grinding process conditions can be: material is 1:(1.0 ~ 2.0 with the mass ratio of ball-milling medium and deionized water): (1.0 ~ 1.5), Ball-milling Time is 12 ~ 26 hours, and described ball-milling medium is agate ball.
Step b) in, can after the drying, add the deionized water of total powder 4% ~ 10% quality before briquetting.
Step c) in, BST powder can cross 40 mesh sieves before carrying out wet ball grinding.
Step c) in wet ball grinding process conditions carve and be: material is 1:(1.5 ~ 2.0 with the mass ratio of ball-milling medium and deionized water): (0.5 ~ 1.0), Ball-milling Time is 24 ~ 48 hours, and described ball-milling medium is agate ball.
Steps d) described in binding agent can be such as mass concentration be 2% ~ 5% polyvinyl alcohol (PVA) solution, the addition of PVA solution is 2% ~ 5% of BST powder quality.
Steps d) in digestion time can be 22 ~ 26 hours.
Steps d) in plastic removal temperature can be 750 ~ 850 DEG C.
The present invention compared with prior art, has following beneficial effect:
1) BST pyroelectric ceramics dielectric constant of the present invention is high, and can reach more than 9500, pyroelectric coefficient is high, can reach 18 × 10
-8c/cm
2more than K, and sample purity is high, performance is high, uniformity is good, can meet the requirement making non-refrigerating infrared focal plane device, effectively solves the problem that BST pottery is difficult to sinter to high-compactness;
2) preparation method of the present invention have technique simple, without the need to special installation, low cost and other advantages, be applicable to large-scale production, industrialization demand can be met.
Exemplify embodiment below further to describe the present invention in detail.Should understand equally; following examples are only used to further illustrate the present invention; can not be interpreted as limiting the scope of the invention, some nonessential improvement that those skilled in the art's foregoing according to the present invention is made and adjustment all belong to protection scope of the present invention.The temperature that following example is concrete, time, inventory etc. are also only examples in OK range, and namely, those skilled in the art can be done in suitable scope by explanation herein and select, and do not really want the concrete numerical value being defined in Examples below.
Embodiment 1
First BaCO is taken
3, SrCO
3and TiO
2powder, and add a small amount of CaCO
3, Y
2o
3, MnCO
3powder, makes all powders mix by wet ball grinding technique; The mass ratio of material, ball-milling medium and deionized water is 1:1.5:1.2, and Ball-milling Time is 24 hours, and ball-milling medium is agate ball.
Dried by abrasive material, add the deionized water of total powder quality 4%, briquetting, synthesizes in atmosphere, and synthesis temperature is 1150 DEG C, and temperature retention time is 2 hours, obtains BST block; Pulverize, cross 40 mesh sieves, then add the ZnO powder of 2.7wt%, by wet ball grinding technique, powder is mixed; The mass ratio of material, ball-milling medium and deionized water is 1:2.0:0.8, and Ball-milling Time is 48 hours, and ball-milling medium is agate ball.
Dry, add PVA solution as binding agent, granulation, ageing 24 hours, sieves, and carries out isostatic compaction after precompressed, and biscuit, at 800 DEG C of plastic removals, namely obtains BST base substrate; Sintered under oxygen by BST base substrate, the condition of sintering is: heat up with the speed of 2.0 DEG C/min; Start logical oxygen when being warming up to 800 DEG C, oxygen flow is 2L/ minute; When being warming up to 1350 DEG C, be incubated 5 hours; Be cooled to room temperature, close oxygen.
The sample sintered is passed through the techniques such as cutting, grinding and polishing, and be processed into the size of needs, then anneal under oxygen atmosphere, annealing process condition is: heat up with the speed of 1 ~ 4 DEG C/min, and pass into oxygen, oxygen flow is 1 ~ 3L/ minute; When being warming up to 800 DEG C, be incubated 2 hours; Cool to room temperature with the furnace, close oxygen.
The sample of having annealed is processed into the size of needs, ultrasonic cleaning, silk screen printing silver slurry, dries, is incubated 30 minutes, tests dielectric and the pyroelectric property of sample under direct current (DC) bias at 700 DEG C.
Embodiment 2
The annealing temperature of BST pottery is 1250 DEG C, and annealing time is 2 hours, and all the other contents are with described in embodiment 1.
Comparative example 1
Described in embodiment 1, obtain the sample sintered, and do not carry out after annealing process.
The change curve comparison diagram of the BST pyroelectric ceramics that Fig. 1 is embodiment 1, embodiment 2 is obtained and unannealed sample dielectric constant with temperature under applying direct current electric field that comparative example 1 obtains, as seen from Figure 1: the Curie temperature of sample is all near room temperature, dielectric constant peak value under 800 DEG C, 1250 DEG C annealing specimen null fields is respectively 9851 and 11119, unannealed sample is then 8085, improve 22% and 38% respectively, increasing degree is very large, and this is very beneficial for the raising of its pyroelectric coefficient.
The BST pyroelectric ceramics that Fig. 2 is embodiment 1, embodiment 2 is obtained and the obtained unannealed sample of comparative example 1 adopt the pyroelectric coefficient of Quasi-static Method test with the change curve comparison diagram of temperature and applying direct current electric field, as seen from Figure 2: 800 DEG C, 1250 DEG C annealing specimens are under 850V/mm electric field, and pyroelectric coefficient peak value is respectively 18.8 × 10
-8ccm
-2k
-1with 20.9 × 10
-8ccm
-2k
-1, unannealed sample is then 16.7 × 10
-8ccm
-2k
-1, improve 13% and 25% respectively, increasing degree is very large, and this will be conducive to it and be applied to non-refrigerating infrared focal plane.
In sum, the BST pyroelectric ceramics prepared of the present invention is adopted to have high (pyroelectric coefficient >18 × 10 under 850V/mm of dielectric constant high (relative dielectric constant >9800), pyroelectric coefficient
-8ccm
-2k
-1) advantage, the sample of annealing at two temperature can improve 22% and 38%, 13% and 25% respectively than unannealed sample permittivity, pyroelectric coefficient, and increasing degree is very large, is conducive to very much its application at non-refrigerating infrared focal plane.
The present invention efficiently solves the difficult problem that general technology is difficult to prepare high-k and high pyroelectric coefficient BST pottery, and preparation method is simple, the cycle is short, cost is low, is applicable to large-scale production, can meets the needs of practical application.
Claims (5)
1. the method adopting post growth annealing to prepare high-performance barium strontium titanate pyroelectric ceramics, it is characterized in that, anneal through sintering the barium-strontium titanate ceramic obtained under oxygen atmosphere, annealing temperature is 800 ~ 1250 DEG C, annealing time is 2 ~ 5 hours, high-performance barium strontium titanate pyroelectric ceramics can be obtained, the null field relative dielectric constant peak value >9800 of obtained high-performance barium strontium titanate pyroelectric ceramics, pyroelectric coefficient peak value >18 × 10
-8c/cm
2k, in the rear in annealing, rises to described annealing temperature with the speed of 1 ~ 4 DEG C/min, and in the rear in annealing, the flow passing into oxygen is 1 ~ 3L/ minute;
Wherein, describedly to be obtained through sintering the barium-strontium titanate ceramic that obtains by following steps:
A) BaCO of stoichiometric proportion is taken according to the chemical formula of high-performance barium strontium titanate pyroelectric ceramics to be prepared
3, SrCO
3, TiO
2the oxide of powder and doped chemical and/or carbonate powder, make all powders mix by wet ball grinding technique and obtain raw mixture;
B) briquetting after the raw mixture of gained being dried, synthesize in atmosphere, synthesis temperature is 1000 ~ 1200 DEG C, and temperature retention time is 1 ~ 3 hour, obtains barium strontium titanate block;
C) by step b) the barium strontium titanate block that obtains carries out pulverizing, sieving, make powder refining by wet ball grinding technique, discharging post-drying, add the binding agent of ormal weight, through granulation, ageing, sieve after precompressed again, isostatic compaction, plastic removal, obtained barium strontium titanate base substrate;
D) by step c) the barium strontium titanate base substrate that obtains sinters under oxygen atmosphere, and sintering temperature is 1350 ~ 1450 DEG C, and temperature retention time is 1 ~ 5 hour, namely obtained described through sintering the barium-strontium titanate ceramic obtained;
Steps d) in, the process conditions of described sintering are: heat up with the speed of 1 ~ 4 DEG C/min, start logical oxygen when being warming up to 800 ~ 1000 DEG C, oxygen flow is 1 ~ 3L/min; When being warming up to 1350 ~ 1450 DEG C, be incubated 1 ~ 5 hour; Cool to room temperature with the furnace, close oxygen, obtain barium-strontium titanate ceramic.
2. method according to claim 1, it is characterized in that, step a) in wet ball grinding process conditions be: material is 1:(1.0 ~ 2.0 with the mass ratio of ball-milling medium and deionized water): (1.0 ~ 1.5), Ball-milling Time is 12 ~ 26 hours, and described ball-milling medium is agate ball.
3. method according to claim 1, is characterized in that, step b) in, after the drying, add the deionized water of total powder 4% ~ 10% quality before briquetting.
4. method according to claim 1, is characterized in that, step c) in,
Barium-strontium titanate powder crosses 40 mesh sieves before carrying out wet ball grinding;
Described wet ball grinding process conditions are: material is 1:(1.5 ~ 2.0 with the mass ratio of ball-milling medium and deionized water): (0.5 ~ 1.0), Ball-milling Time is 24 ~ 48 hours, and described ball-milling medium is agate ball;
Described binding agent to be mass concentration be 2% ~ 5% poly-vinyl alcohol solution, the addition of poly-vinyl alcohol solution is 2% ~ 5% of barium-strontium titanate powder quality.
5. method according to claim 1, is characterized in that, step c) in,
Digestion time is 22 ~ 26 hours;
Plastic removal temperature is 750 ~ 850 DEG C.
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