CN1792814A - Process for preparing submicron grade barium strontium phthalate powder by packing method - Google Patents
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- 239000000843 powder Substances 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title abstract 2
- XSSWGBAWDZYQIP-UHFFFAOYSA-J C(C=1C(C(=O)[O-])=CC=CC1)(=O)[O-].[Sr+2].[Ba+2].C(C=1C(C(=O)[O-])=CC=CC1)(=O)[O-] Chemical compound C(C=1C(C(=O)[O-])=CC=CC1)(=O)[O-].[Sr+2].[Ba+2].C(C=1C(C(=O)[O-])=CC=CC1)(=O)[O-] XSSWGBAWDZYQIP-UHFFFAOYSA-J 0.000 title 1
- 238000012856 packing Methods 0.000 title 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 30
- DHEQXMRUPNDRPG-UHFFFAOYSA-N strontium nitrate Chemical compound [Sr+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O DHEQXMRUPNDRPG-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 13
- 229920002125 Sokalan® Polymers 0.000 claims abstract description 10
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 claims abstract description 10
- 239000004584 polyacrylic acid Substances 0.000 claims abstract description 10
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims abstract description 7
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 claims abstract description 7
- 229910000018 strontium carbonate Inorganic materials 0.000 claims abstract description 7
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000001099 ammonium carbonate Substances 0.000 claims abstract description 6
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims abstract description 5
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 229910052454 barium strontium titanate Inorganic materials 0.000 claims abstract 3
- 238000002360 preparation method Methods 0.000 claims description 17
- 239000004408 titanium dioxide Substances 0.000 claims description 13
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 claims description 11
- 239000002002 slurry Substances 0.000 claims description 11
- WOIHABYNKOEWFG-UHFFFAOYSA-N [Sr].[Ba] Chemical compound [Sr].[Ba] WOIHABYNKOEWFG-UHFFFAOYSA-N 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 229910001427 strontium ion Inorganic materials 0.000 claims description 6
- PWYYWQHXAPXYMF-UHFFFAOYSA-N strontium(2+) Chemical compound [Sr+2] PWYYWQHXAPXYMF-UHFFFAOYSA-N 0.000 claims description 6
- 238000000498 ball milling Methods 0.000 claims description 5
- 239000008187 granular material Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000003786 synthesis reaction Methods 0.000 claims description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000002243 precursor Substances 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims 2
- 235000012501 ammonium carbonate Nutrition 0.000 claims 1
- 239000001569 carbon dioxide Substances 0.000 claims 1
- 229910002092 carbon dioxide Inorganic materials 0.000 claims 1
- 238000003837 high-temperature calcination Methods 0.000 claims 1
- 238000001354 calcination Methods 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 abstract description 3
- 238000000227 grinding Methods 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 abstract 1
- 238000000151 deposition Methods 0.000 abstract 1
- 239000007791 liquid phase Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 6
- 229910010413 TiO 2 Inorganic materials 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
- 239000013543 active substance Substances 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005616 pyroelectricity Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000001931 thermography Methods 0.000 description 2
- 101100010166 Mus musculus Dok3 gene Proteins 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- ZJRXSAYFZMGQFP-UHFFFAOYSA-N barium peroxide Chemical compound [Ba+2].[O-][O-] ZJRXSAYFZMGQFP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005421 electrostatic potential Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000003836 solid-state method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
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Abstract
A process for preparing submicron-class barium strontium titanate (BST) powder by wrapping method includes such steps as mixing barium carbonate powder, TiO2 powder and strontium nitrate solution, adding polyacrylic acid, wet ball grinding, adding excessive ammonium bicarbonate solution while stirring, using ammonia water to regulate pH=7-10 for depositing the strontium carbonate on the surface of barium carbonate and TiO2 particles, filtering, washing, drying and calcining.
Description
Technical field
The invention relates to a kind of preparation method of strontium-barium titanate (BST) submicron order powder, belong to the category of ceramic powder preparation.This method is different from traditional BST powder solid phase, the preparation method of liquid phase, and uses polyacrylic acid to be dispersion agent and tensio-active agent, makes Strontium carbonate powder evenly be wrapped in solid particles surface by pack and prepares submicron order BST powder.
Technical background
Ferroelectric BST stupalith since its high-k, excellent performance such as Curie temperature is adjustable be widely used in the various electronic ceramic devices.For example various piezoelectric transducer (Li, X.; Qiu, F.; Guo, K.; Zou, B.; Gu, J.; Wang, J.; Xu, B.Mater.Chem.Phys.1997,50,227.), dynamic RAM (DRAM) (Tahan, D.; Safari, A.; Klein, L.C.in Proc.IEEE.Int.Symp.Appl.Ferroelectr.ed.Pandey, R.K.; Liu, M.; Safari, A.New York.1994,9,427.) and phase changer (Wul, B.M.; Goldman, I.M.Dokl.Akad, Nauk SSSR1945,46,157) etc.Recently, the excellent properties that the BST stupalith is shown on the no-refrigeration infrared focal plane thermal imaging system has caused the great interest of people (Jun, Y.H. again; Kim, T.Y.; Jang, H.M.Ferroelectrics.1997,193,109.).Because it is worked, and does not need refrigeration unit, therefore greatly reduced the cost of producing infrared sensor near room temperature.Have under the room temperature advantage such as work, response spectrum is wide, but the fast all weather operations of response speed, low cost, reduce power consumption, long lifetime, miniaturization, high reliability, application have a large capacity and a wide range by the no-refrigeration infrared focal plane thermal imaging system that this class material is made, become in the current infrared focal plane imaging technology one of the most noticeable technological breakthrough.
In order to obtain the BST stupalith of excellent performances such as dielectric, pyroelectricity, high purity, high structure uniformly are its essential characteristics.So the preparation of even, the ultra-fine BST powder of chemical constitution is one of factor of most critical, because powder has the greatest impact to last agglomerating.In recent years, people have adopted various liquid phase methods to prepare ultra-fine BST powder.Prepare powder with general solid reaction process and compare, it is good that liquid phase method has each constituent element mixing uniformity, and the reactive behavior height obtains advantages such as fine powder body easily.But present various liquid phase methods have limited its practicability greatly owing to there are some shortcomings that are difficult to overcome.Comparatively serious (Y.B.Khollam, S.B.Deshpande, H.S.Potdar, Mater Charact 2005 of the powder reuniting of coprecipitation method preparation for example; 54:63-74), and be difficult to remove foreign ion; Hydrothermal method is difficult to obtain the BST powder (Ryan K.Roeder, Elliott B.Slamovich .J.Am.Ceram.Soc., 82[7] 1665-75 (1999)) of stoichiometric ratio; And general sol-gel method, it is expensive that the raw material of employing all compares, and cost is higher.Therefore, exploration can either reduce the synthesis temperature of BST, can guarantee stoichiometric ratio again, and the technological process novel method of practical preparation BST powder simply again just becomes one of key problem in technology of present urgent need solution.
Summary of the invention
The object of the present invention is to provide a kind of method that adopts the sedimentary mode of parcel to prepare submicron order BST powder. present method is at certain class composite material and preparation method thereof (Ping-Hua Xiang, Xian-Lin Dong, Chu-De Feng, Yong-Ling Wang, .J.Am.Ceram.Soc., 86[9] 1631-34 (2003)) the basis on derive out.Select SrCO for use
3Be wrapped in BaCO as throw out
3, TiO
2The surface of solid particulate, feasible active originally not high Sr
2+Ion can be evenly distributed in particle surface, has improved Sr greatly
2+The ionic reactive behavior has reduced synthesis temperature.Utilize the present invention to prepare the BST powder, compare, have the simple and practical advantage of precursor with general liquid phase method; Compare with general method synthetic method admittedly, the advantage of its semi-liquid phase method not only can make its reactive behavior improve, and makes synthesis temperature reduce by 100～200 ℃ again, is of value to generating tiny, the uniform powder of granularity.Adopt the BST powder of the prepared submicron order of the present invention, not only reduced the sintering temperature of BST material, just can reach higher density at a lower temperature.
Selected for use polyacrylic acid as dispersion agent when the present invention prepares coated powder, it suppresses BaCO by sterically hindered and electrostatic potential inhibition effect
3And TiO
2Particles settling, the slurry that obtained performance is stable is for the powder that successfully prepares parcel is laid a good foundation.In addition, polyacrylic acid is a kind of extraordinary anion surfactant, therefore is adsorbed on BaCO
3And TiO
2The polyacrylic acid negatively charged ion of particle surface can adsorption zone positive electricity Sr
2+Ion makes it accumulate in BaCO
3, TiO
2Around the particle, this will help the formation of package structure.Obtain wrapping up after the throw out, throw out is synthetic in 950～1100 ℃ of scopes, can obtain BST fine powder body.
The present invention is a raw material with barium carbonate powder, titanium dioxide powder, strontium nitrate solution, strontium nitrate solution is mixed with certain density stabilizing solution, three kinds of atomic ratios of Ba: Sr: Ti are 1-X: X afterwards: 1 (0＜X≤0.30), this solution is mixed with above-mentioned two kinds of materials, and add a certain amount of polyacrylic acid as dispersion agent and tensio-active agent, ball milling 24h.When the preparation coated powder, stir the ball milling liquid of precursor, and add excessive ammonium bicarbonate soln, and regulate the pH value between 7～10 with ammoniacal liquor, make strontium ion precipitation fully and be wrapped in barium carbonate, titanium dioxide granule surface, form stable coated powder slurry, and slurry washing, drying are wrapped up throw out uniformly.Stable parcel throw out 950～1100 ℃ of calcinings down, is obtained even, tiny submicron order BST powder.(technical process sees also Fig. 1)
The concentration of described strontium nitrate solution is 0.5～2mol/l, and solvent is distilled water or deionized water commonly used; Described polyacrylic solution quality concentration is 50%, and add-on is 0.5%～1% of barium carbonate, a titanium dioxide powder gross weight; Described excessive bicarbonate of ammonia or be volatile salt (NH
4)
2CO
3, its concentration is 1-2mol/l; The stable inclusion stable slurry of described formation is used deionized water earlier, washs with ethanol or acetone then, and dry down at 50～100 ℃; Described strontium ion is at barium carbonate, barium dioxide particle surface with the sedimentary wrapped of Strontium carbonate powder.
1, to have technology simple for the preparation method of the submicron order BST fine powder body that provides of invention, and process is characteristics such as control easily.Combine the advantage separately in traditional solid reaction process and the liquid phase method.Synthetic powder granule degree is tiny, even, and can realize the mass preparation.
2, the synthesis temperature of BST powder is in 950～1100 ℃, and 950 ℃ of BST powders that can form the uhligite phase down are at 1050 ℃ of BST powders (Fig. 6) that can obtain the pure perovskite phase down.The median size of powder between 0.2-1.0 μ m, narrow distribution range, evenly.Carry out the sintering of pottery with the powder of present method preparation, can obtain density down up to 95.18% BST pottery at 1310 ℃.Preparation-obtained stupalith at room temperature (1KHz) specific inductivity is 5139, and dielectric loss is 0.94%.(specific inductivity is 11461 with the prepared electrical property that goes out pottery of conventional solid-state method, dielectric loss is 1.6%) compare, both all have significantly improvement, has great advantage for the pyroelectricity material (moderate specific inductivity, low-dielectric loss) that is applied on the non-refrigeration infrared detector.
Description of drawings
Fig. 1 pack prepares the process flow sheet of ultra-fine BST powder
The particle size distribution figure of Fig. 2 barium carbonate powder
The particle size distribution figure of Fig. 3 titanium dioxide powder
Obtain the sedimentary TEM figure of parcel under the condition of Fig. 4 pH=7
Obtain the sedimentary TEM figure of parcel under the condition of Fig. 5 pH=10
Make the XRD diffractogram of BST powder under the condition of Fig. 6 pH=7
Make the XRD diffractogram of BST powder under the condition of Fig. 7 pH=10
Make the SEM shape appearance figure of BST powder under the condition of Fig. 8 pH=7
Make the SEM shape trade figure of BST powder under the condition of Fig. 9 pH=10
Specific embodiments
The ultra-fine BST powder of preparation under the condition of embodiment 1:pH=7
By flow process shown in Figure 1, dispose the strontium nitrate solution of finite concentration (1mol/l) earlier, according to stoichiometric ratio barium carbonate, titanium dioxide and strontium nitrate solution are mixed (Ba: Sr: Ti=0.70: 0.30: 1.00) again, and add 0.5%～1% the polyacrylic acid that concentration is 50% relative barium carbonate, titanium dioxide total weight of solids, as dispersion agent and tensio-active agent, wet ball grinding 24 hours.The slurry that mixes is taken out, that adding under agitation prepares in advance, excessive ammonium bicarbonate soln (concentration is 1mol/l), regulating the pH value with ammoniacal liquor is about 7, makes strontium ion evenly be wrapped in barium carbonate, titanium dioxide granule surface with the sedimentary form of Strontium carbonate powder, forms stable slurry.With sedimentation and filtration, washing, drying and 950～1100 ℃ of calcinings down, prepare even particle size distribution, tiny submicron order BST powder, size-grade distribution is between 0.2-1.0 μ m.(see respectively each 4,6,8) employed BaCO
3, TiO
2Size-grade distribution such as Fig. 2, shown in Figure 3.
The ultra-fine BST powder of preparation under the condition of embodiment 2:pH=10
By schema shown in Figure 1, dispose the strontium nitrate solution of finite concentration (2mol/l) earlier, according to stoichiometric ratio barium carbonate, titanium dioxide and strontium nitrate solution are mixed (Ba: Sr: Ti=0.90: 0.10: 1.00) again, and add 0.5%～1% the polyacrylic acid that concentration is 50% relative barium carbonate, titanium dioxide total weight of solids, as dispersion agent and tensio-active agent, wet ball grinding 24 hours.The slurry that mixes is taken out, under agitation add ammonium bicarbonate soln that prepare in advance, excessive (concentration is 1mol/l), regulating the pH value with ammoniacal liquor is about 10, makes strontium ion evenly be wrapped in barium carbonate, titanium dioxide granule surface with the sedimentary form of Strontium carbonate powder, forms stable slurry.With sedimentation and filtration, washing, drying and calcining under 1100 ℃, prepare the submicron order BST powder of even particle size distribution, size-grade distribution is between 0.2-1.0 μ m.(seeing Fig. 5,7 and 9 respectively).
Claims (7)
1, a kind of method of utilizing pack to prepare the submicron grade barium strontium powder comprises the preparation of precursor ball milling liquid, the preparation process and the high-temperature calcination synthesis technique of coated powder, it is characterized in that processing step is:
(1) be raw material with barium carbonate powder, titanium dioxide powder, strontium nitrate solution, strontium nitrate solution is mixed with 0.5～2mol/l steady concentration solution, afterwards by Ba: three kinds of atomic ratios of Sr: Ti are 1-X: X: 0＜X≤0.30, strontium nitrate solution is mixed with above-mentioned two kinds of materials, and the adding polyacrylic acid solution, ball milling 20～24h;
(2) when the preparation coated powder, stir precursor ball milling liquid, add excessive ammonium bicarbonate soln, and regulate the pH value between 7～10 with ammoniacal liquor, make strontium ion precipitation fully and be wrapped in barium carbonate, titanium dioxide granule surface, form stable coated powder slurry, and slurry washing, drying are wrapped up throw out uniformly;
(3) at last stable parcel throw out is calcined down at 950～1100 ℃.
2. by the described method of utilizing pack to prepare the submicron grade barium strontium powder of claim 1, the polyacrylic acid mass percentage concentration that it is characterized in that described adding is 50%, and add-on is 0.5%～1% of barium carbonate, a titanium dioxide powder gross weight.
3. by the described method of utilizing pack to prepare the submicron grade barium strontium powder of claim 1, it is characterized in that described NH
4HCO
3Solution or be (NH
4)
2CO
3Solution, and constantly stir.
4. by claim 1 or the 3 described methods of utilizing pack to prepare the submicron grade barium strontium powder, it is characterized in that described slurry is to use deionized water earlier, wash with ethanol or acetone then, and dry down at 50～100 ℃.
5. by claim 1 or the 3 described methods of utilizing pack to prepare the submicron grade barium strontium powder, it is characterized in that described excessive bicarbonate of ammonia or concentration of ammonium carbonate are 1-2mol/l.
6. by the described method of utilizing pack to prepare the submicron grade barium strontium powder of claim 1, the barium-strontium titanate powder particle diameter that it is characterized in that described preparation is between 0.2-1.0 μ m.
7. by the described method of utilizing pack to prepare the submicron grade barium strontium powder of claim 1, it is characterized in that strontium ion is on Strontium carbonate powder carbon dioxide particle surface with the sedimentary wrapped of Strontium carbonate powder.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102241509A (en) * | 2011-05-26 | 2011-11-16 | 中国科学院上海硅酸盐研究所 | Method for preparing barium strontium titanate nano powder |
| CN101618342B (en) * | 2008-07-02 | 2012-02-15 | 黑龙江大学 | Polymer modified high-activity nano titanium dioxide catalyst and preparation method thereof |
| CN105693243A (en) * | 2015-12-30 | 2016-06-22 | 南京工业大学 | Preparation method of dielectric constant high-performance microwave dielectric ceramic |
| CN108250803A (en) * | 2017-11-13 | 2018-07-06 | 云浮鸿志新材料有限公司 | A kind of modified nanometer precipitated barium sulfate raw powder's production technology |
| CN108975908A (en) * | 2018-08-29 | 2018-12-11 | 济南大学 | A kind of preparation method for molded through three-dimensional printing technique strontium titanate ceramic powder |
| CN110203967A (en) * | 2019-07-05 | 2019-09-06 | 西安电子科技大学 | The preparation method of sheet strontium titanates nano crystal body |
| CN112174198A (en) * | 2020-09-30 | 2021-01-05 | 湖南先导电子陶瓷科技产业园发展有限公司 | Synthesis method of high-purity superfine nano barium strontium titanate material |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5312790A (en) * | 1993-06-09 | 1994-05-17 | The United States Of America As Represented By The Secretary Of The Army | Ceramic ferroelectric material |
| CN1212997C (en) * | 2003-09-05 | 2005-08-03 | 中国科学院上海硅酸盐研究所 | Preparation method of barium strontium titanate ultra-fine powder |
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2005
- 2005-11-16 CN CNB2005101103862A patent/CN100378005C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101618342B (en) * | 2008-07-02 | 2012-02-15 | 黑龙江大学 | Polymer modified high-activity nano titanium dioxide catalyst and preparation method thereof |
| CN102241509A (en) * | 2011-05-26 | 2011-11-16 | 中国科学院上海硅酸盐研究所 | Method for preparing barium strontium titanate nano powder |
| CN105693243A (en) * | 2015-12-30 | 2016-06-22 | 南京工业大学 | Preparation method of dielectric constant high-performance microwave dielectric ceramic |
| CN108250803A (en) * | 2017-11-13 | 2018-07-06 | 云浮鸿志新材料有限公司 | A kind of modified nanometer precipitated barium sulfate raw powder's production technology |
| CN108250803B (en) * | 2017-11-13 | 2020-03-27 | 云浮鸿志新材料有限公司 | Preparation method of modified nano precipitated barium sulfate powder |
| CN108975908A (en) * | 2018-08-29 | 2018-12-11 | 济南大学 | A kind of preparation method for molded through three-dimensional printing technique strontium titanate ceramic powder |
| CN110203967A (en) * | 2019-07-05 | 2019-09-06 | 西安电子科技大学 | The preparation method of sheet strontium titanates nano crystal body |
| CN112174198A (en) * | 2020-09-30 | 2021-01-05 | 湖南先导电子陶瓷科技产业园发展有限公司 | Synthesis method of high-purity superfine nano barium strontium titanate material |
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| CN100378005C (en) | 2008-04-02 |
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