CN115745597A - Method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramic by using cold sintering technology - Google Patents
Method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramic by using cold sintering technology Download PDFInfo
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Abstract
The invention discloses a method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramic by using a cold sintering technology, which comprises the following steps: synthesizing BaTiO with high aspect ratio 3 A sheet form; calcination preparation of (1-x) BaFeO 3 ‑xBaTiO 3 Pre-sintering the powder, and then ball-milling the pre-sintered powder to obtain ceramic matrix powder; mixing ceramic matrix powder with binder, plasticizer, defoaming agent, dispersant, anhydrous alcohol and sintering aid Ba (OH) 2 ﹒8H 2 Mixing O, performing primary ball milling, and adding BaTiO into the mixed slurry 3 Carrying out secondary ball milling on the flaky template to obtain casting slurry; casting the casting slurry to obtain a casting film; cutting the casting film into a wafer, and stackingLaminating and hot-press forming to obtain a ceramic green body; carrying out glue discharging on the ceramic green body, and then carrying out cold isostatic pressing; and (4) carrying out cold sintering on the ceramic green body subjected to cold isostatic pressing to obtain the textured ceramic. The invention can effectively reduce the sintering temperature of the ceramic and improve the texture degree and the piezoelectric property of the ceramic.
Description
Technical Field
The invention relates to a preparation method of bismuth ferrite-barium titanate ceramic, in particular to a method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramic by using a cold sintering technology.
Background
With the rapid development of industrial technology, high-temperature piezoelectric devices are widely applied in production and life, lead zirconate titanate (PZT) based ceramics occupy the leading market, but the curie temperature is low, the application condition is limited to below 200 ℃, lead element is volatile in the sintering process, and the toxicity of lead element causes serious harm to human bodies and ecological environment. Therefore, the development of a high-performance and environment-friendly lead-free high-temperature piezoelectric ceramic material is imperative.
The bismuth ferrite-barium titanate ceramic has higher Curie temperature and better piezoelectric property, and becomes one of the most potential materials in the field of high-temperature piezoelectric ceramics. However, in the process of preparing BF-BT ceramics, the inevitable volatilization of bismuth and reduction of Fe3+ generally result in a large leakage current, which makes polarization difficult. As is well known, the Curie temperature and the piezoelectric performance can be effectively improved by methods such as adding MnO2 to inhibit Fe < 3+ > from being converted into Fe < 2+ >, regulating BT content to construct a Morphological Phase Boundary (MPB), chemically doping and the like. Although the piezoelectric performance of BF-BT is greatly improved by the above method, there is still a large room for improvement. In order to meet the requirements of practical application, the piezoelectric performance of the BF-BT ceramic is required to be further improved, because the BF-BT ceramic has excellent piezoelectric performance in the (001) crystal direction, and the conventional solid-phase sintered polycrystalline ceramic grains are randomly oriented, a Template Grain Growth (TGG) method is adopted, the template is directionally distributed in the ceramic matrix through a casting process, and the ceramic grains are directionally grown along the orientation of the (001) template, so that the piezoelectric performance of the ceramic is improved. Compared with single crystal, the texture method has the advantages of low cost, high performance and uniform components.
The ceramic sintering refers to a process of solidifying ceramic powder into a compact block through substance migration, the conventional sintering uses heating as an external action, and the sintering kinetics is influenced mainly by increasing the mobility of an atom, so that the mass transfer in the sintering process is promoted.
In the high-temperature sintering process, the template can react with the ceramic matrix to cause the template to disappear, so that ceramic grains can not grow along the grains, and the texture degree of the ceramic is low or even no texture degree exists. Secondly, the melting point of Bi2O3 is low (800-900 ℃), and a liquid phase can be formed in the sintering process, so that the sintering density is low. Therefore, the reduction of the sintering temperature of the ceramic and the improvement of the texture degree of the ceramic have positive significance for the improvement of the performance of the ceramic.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramic by using a cold sintering technology, which can effectively reduce the sintering temperature of the ceramic and improve the texture and piezoelectric performance of the ceramic.
The technical scheme of the invention is as follows:
a method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramics by using a cold sintering technology comprises the following steps:
s1, synthesizing BaTiO with high aspect ratio by adopting molten salt topological chemical conversion process 3 A sheet form;
s2, adding Bi 2 O 3 、Fe 2 O 3 、TiO 2 、BaCO 3 、MnO 2 The powder material is (1-x) BaFeO 3 -xBaTiO 3 After stoichiometric weighing, absolute ethyl alcohol is added for first ball milling to obtain slurry, and then the slurry is dried and calcined to prepare (1-x) BaFeO 3 -xBaTiO 3 Pre-sintering the powder, and performing secondary ball milling on the pre-sintered powder to obtain ceramic matrix powder;
s3, mixing the ceramic matrix powder obtained in the S2 with a binder, a plasticizer, a defoaming agent, a dispersing agent, absolute ethyl alcohol and a sintering aid Ba (OH) 2 ﹒8H 2 Mixing O, performing primary ball milling, and adding the BaTiO obtained by S1 into the mixed slurry 3 Carrying out secondary ball milling on the flaky template to obtain casting slurry;
s4, carrying out tape casting on the tape casting slurry obtained in the S3 to obtain a tape casting film;
s5, cutting the casting film obtained in the step S4 into a wafer, and then carrying out lamination and hot press molding to obtain a ceramic green body;
s6, carrying out glue discharging on the ceramic green body obtained in the S5, and then carrying out cold isostatic pressing;
and S7, carrying out cold sintering on the ceramic green body subjected to cold isostatic pressing to obtain the textured ceramic.
The step S1 comprises the following steps:
s11, adding Bi 2 O 3 And TiO 2 According to the reaction formula 2Bi 2 O 3 +3TiO 2 →Bi 4 Ti 3 O 12 Mixing the raw materials according to the proportion, ball-milling the raw materials for 10 to 24 hours by using ethanol at the ball-milling speed of 200 to 300r/min, drying the raw materials, mixing the dried raw materials with KCl/NaCl with the same mass and the molar ratio of 1:1 in the ethanol, uniformly stirring the mixture, drying and sieving the mixture, putting the mixture into a crucible, preserving the temperature for 1 hour at 1050 ℃, repeatedly washing the mixture by using hot deionized water to remove salt to obtain Bi 4 Ti 3 O 12 A precursor;
s12, preparing Bi obtained in S11 4 Ti 3 O 12 Precursor and TiO 2 、BaCO 3 According to the reaction formula Bi 4 Ti 3 O 12 +BaCO 3 +TiO 2 →BaBi 4 Ti 4 O 15 +CO 2 Mixing the mixture with the same mass of NaCl/KCl in the molar ratio of 1:1, and stirring the mixture in ethanol gentlyMixing, drying, sieving, keeping at 950-1050 deg.C for 2-3h, and repeatedly washing with hot deionized water to remove salt to obtain BaBi 4 Ti 4 O 15 A precursor;
s13, baBi obtained from S12 4 Ti 4 O 15 Precursor and BaCO 3 Mixing according to the molar ratio of 1:4, then stirring with KCl/NaCl with the same mass and the molar ratio of 1:1 in ethanol gently, drying, sieving, keeping the temperature at 900-950 ℃ for 3h, and repeatedly cleaning with 1mol/L dilute nitric acid to remove Bi 2 O 3 Finally, washing with deionized water to obtain BaTiO 3 Lamellar crystallites.
Furthermore, in step S2, the grinding balls used for ball milling are zirconium balls, the rotation speed of the ball mill is 200-300r/min, and the ball milling time is 15-24h.
Further, in step S2, after the slurry obtained by the first ball milling is dried by an oven, the slurry is subjected to heat preservation at 750-800 ℃ for 3-5h to be calcined to prepare (1-x) BaFeO3-xBaTiO3 pre-sintered powder.
Further, in step S3, dibutyl phthalate is used as the dispersant, n-butanol is used as the defoaming agent, polyvinyl butyral is used as the binder, polyethylene glycol is used as the plasticizer, and ceramic matrix powder: anhydrous ethanol: dibutyl phthalate: n-butanol: polyvinyl butyral: polyethylene glycol: baTiO 2 3 The mass ratio of the flaky template is 1: (0.7-1.4): (0.0021-0.006): (0.002-0.006): (0.005-0.1): (0.006-0.06): (0.01-0.3), sintering aid Ba (OH) 2 ﹒8H 2 The content of O is 12-16wt% of the ceramic matrix powder.
Further, in step S3, ball milling is performed in a ball milling tank, wherein the first ball milling is performed for 15-20 hours, and the second ball milling is performed for 15-30 minutes.
Further, in step S4, the casting slurry is cast on a casting machine by a blade of 200 μm to obtain a casting film, the casting speed is 0.6cm/S to 2cm/S, and the thickness of the casting film is 60 to 500 μm.
Further, in step S5, the diameter of the cut wafer is 10mm, and the thickness of the ceramic green compact obtained by laminating and hot press molding is 400-800 μm.
Further, in step S6, the temperature rising rate is 0.1-0.5 ℃/min in the glue discharging process, the temperature is kept at 150-200 ℃ for 0.5-2h, the temperature is kept at 400-450 ℃ for 0.5-2h, the temperature is kept at 550-600 ℃ for 0.5-2h, the pressure of cold isostatic pressing is 100-300MPa, and the time is 1-10min.
Further, in step S7, the ceramic green body is cold sintered at the pressure of 400MPa, the temperature of 200 ℃, 250 ℃, 300 ℃ and 350 ℃ respectively, and the temperature is kept for 1h to obtain the textured ceramic.
Compared with the prior art, the invention has the beneficial effects that: the textured bismuth ferrite-barium titanate ceramic is prepared by using a cold sintering technology, the sintering temperature of the ceramic can be effectively reduced, 72% of compactness can be obtained by sintering at 300 ℃, and the BaTiO3 sheet template can be prevented from reacting with the ceramic matrix under the low-temperature condition, so that the texture degree and the piezoelectric property of the ceramic are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is an XRD image of a BaTiO3 platelet template of the present invention;
FIG. 2 is an SEM image of a BaTiO3 sheet template of the invention;
FIG. 3 is a sectional SEM image of BF-BT ceramic with BaTiO3 sheet template texture according to the present invention;
FIG. 4 is a d33 image of untextured and different temperature cold-sintered texture samples of the present invention;
FIG. 5 is an XRD image of a sample of untextured and 300 ℃ cold-sintered texture according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to illustrate the technical means of the present invention, the following description is given by way of specific examples.
Examples
The embodiment provides a method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramic by using a cold sintering technology, wherein the cold sintering technology is a pressure process at room temperature by using a transient solvent and uniaxial pressure in a liquid phase form, the ceramic particles can be rapidly densified below 400 ℃ through a dissolution-precipitation process of the ceramic particles, the sintering process is a pressurization process at room temperature, local dissolution, rearrangement and compaction of the ceramic particles mainly occur, in the process, ceramic powder is uniformly wetted under the action of an intermediate liquid phase in a solution form, a layer of liquid film is formed on the surfaces of the particles, the liquid film can cause local dissolution of particle tips, the liquid film can be used as a lubricant to accelerate rearrangement and slippage of the particles, the process of heating to the highest temperature and heat preservation under constant pressure is a key stage of ceramic powder densification, and the solution gradually reaches a supersaturated state while the intermediate liquid phase is continuously evaporated along with the rise of temperature, so that the dissolved ceramic powder is precipitated in a precipitation form. And since the chemical potential of the pore region is lower than that of the particle contact region, the dissolved atomic clusters or ions migrate to the pore sites with lower chemical potential and precipitate, thereby reducing the surface energy and gradually achieving densification of the ceramic material. Therefore, the method reduces the sintering temperature of the textured ceramic by a cold sintering technology, so that the energy cannot reach a reaction barrier, the template and the matrix are prevented from reacting, and the texture degree is improved, thereby obtaining excellent piezoelectric performance and better sintering compactness.
The method specifically comprises the following steps:
s1, synthesizing BaTiO with high aspect ratio by adopting molten salt topological chemical conversion process 3 A sheet form. S11, adding Bi 2 O 3 And TiO 2 According to the reaction formula 2Bi 2 O 3 +3TiO 2 →Bi 4 Ti 3 O 12 Mixing the components in proportion, ball-milling the mixture for 10 to 24 hours by using ethanol at the ball-milling rotating speed of 200 to 300r/min, drying the mixture, mixing the dried mixture with KCl/NaCl with the same mass and the molar ratio of 1:1 in the ethanol, and stirring the mixtureUniformly drying, sieving, placing into a crucible, keeping the temperature at 1050 ℃ for 1h, and repeatedly washing with hot deionized water to remove salt to obtain Bi 4 Ti 3 O 12 A precursor; s12, bi obtained in S11 4 Ti 3 O 12 Precursors and TiO 2 、BaCO 3 According to the reaction formula Bi 4 Ti 3 O 12 +BaCO 3 +TiO 2 →BaBi 4 Ti 4 O 15 +CO 2 Mixing the raw materials according to the proportion, then gently and uniformly stirring the mixture with NaCl/KCl with the same mass and the molar ratio of 1:1 in ethanol, drying and sieving the mixture at 950-1050 ℃ for 2-3h, and repeatedly washing the mixture with hot deionized water to remove salt to obtain BaBi 4 Ti 4 O 15 A precursor; s13, baBi obtained from S12 4 Ti 4 O 15 Precursor and BaCO 3 Mixing according to the molar ratio of 1:4, then stirring with KCl/NaCl with the same mass and the molar ratio of 1:1 in ethanol gently, drying, sieving, keeping the temperature at 900-950 ℃ for 3h, and repeatedly cleaning with 1mol/L dilute nitric acid to remove Bi 2 O 3 Finally, washing with deionized water to obtain BaTiO 3 Lamellar crystallites. BaTiO 2 3 XRD images and SEM images of the plate-shaped template are shown in figures 1 and 2, and the diameter of the plate-shaped template is 8-15 μm.
S2, adding Bi 2 O 3 、Fe 2 O 3 、TiO 2 、BaCO 3 、MnO 2 The powder is (1-x) BaFeO 3 -xBaTiO 3 After stoichiometric weighing, adding absolute ethyl alcohol to carry out first ball milling to obtain slurry, then putting the slurry into an oven for drying, then carrying out heat preservation at 750-800 ℃ for 3-5h for calcining to prepare (1-x) BaFeO3-xBaTiO3 pre-sintered powder, and then carrying out second ball milling on the pre-sintered powder to obtain ceramic matrix powder. Wherein, the grinding ball adopted by the ball milling is zirconium ball, the rotating speed of the ball mill is 200-300r/min, and the ball milling time is 15-24h.
S3, mixing the ceramic matrix powder obtained in the S2 with a binder, a plasticizer, a defoaming agent, a dispersing agent, absolute ethyl alcohol and a sintering aid Ba (OH) 2 ﹒8H 2 Mixing O, putting into a ball milling tank for primary ball milling for 15-20h, and adding the BaTiO obtained by S1 into the mixed slurry 3 Sheet form, andand performing secondary ball milling for 15-30 minutes to obtain casting slurry. Wherein, the dispersant adopts dibutyl phthalate, the defoaming agent adopts n-butyl alcohol, the binder adopts polyvinyl butyral, the plasticizer adopts polyethylene glycol, and ceramic matrix powder: anhydrous ethanol: dibutyl phthalate: n-butanol: polyvinyl butyral: polyethylene glycol: baTiO 2 3 The mass ratio of the flaky template is 1: (0.7-1.4): (0.0021-0.006): (0.002-0.006): (0.005-0.1): (0.006-0.06): (0.01-0.3), sintering aid Ba (OH) 2 ﹒8H 2 The content of O is 12-16wt% of the ceramic matrix powder.
And S4, casting the casting slurry obtained in the S3 on a casting machine through a scraper with the thickness of 200 mu m to obtain a casting film, wherein the casting speed is 0.6cm/S-2cm/S, and the thickness of the casting film is 60-500 mu m.
S5, cutting the casting film obtained in the S4 into a wafer with the diameter of 10mm, and then performing lamination and hot press molding to obtain a ceramic green body with the thickness of 400-800 mu m;
and S6, carrying out glue discharging on the ceramic green body obtained in the S5, and then carrying out cold isostatic pressing. Wherein the glue discharging process is at a heating rate of 0.1-0.5 ℃/min, the heat preservation is carried out for 0.5-2h at 150-200 ℃, for 0.5-2h at 400-450 ℃, and for 0.5-2h at 550-600 ℃; the cold isostatic pressing pressure is 100-300MPa, and the time is 1-10min.
And S7, performing cold sintering on the ceramic green body subjected to cold isostatic pressing at the pressure of 400MPa at the temperature of 200 ℃, 250 ℃, 300 ℃ and 350 ℃ respectively, and preserving heat for 1h to obtain the textured ceramic.
And (3) grinding and polishing the sintered ceramic, coating a silver electrode, sintering at 500 ℃ for 20-30min, and testing, wherein the cross section of the ceramic can obviously see the existence of a BaTiO3 sheet template as shown in figure 3, so that the ceramic crystal grains grow around the BaTiO3 sheet template along crystal orientation. The piezoelectric performance of the ceramic is tested, and as shown in fig. 4, the piezoelectric performance of the textured ceramic is obviously improved compared with that of untextured ceramic.
The method prepares the textured bismuth ferrite-barium titanate ceramic by using a cold sintering technology, can effectively reduce the sintering temperature of the ceramic, can obtain 72 percent of compactness by sintering at 300 ℃, and can avoid the BaTiO3 sheet template from reacting with the ceramic matrix under the low-temperature condition, thereby improving the texture degree and the piezoelectric property of the ceramic. The texture degree of the textured ceramic prepared by cold sintering at 300 ℃ is 62%, as shown in fig. 5, compared with the non-textured ceramic, the piezoelectric performance of the ceramic prepared by the cold sintering technology is remarkably improved, the piezoelectric performance of the non-textured 0.7BF-0.3BT ceramic is only 138pC/N during conventional sintering at 1005 ℃, and the piezoelectric performance of the textured ceramic prepared by cold sintering at 300 ℃ can reach 215pC/N.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramic by using a cold sintering technology is characterized by comprising the following steps:
s1, synthesizing BaTiO with high aspect ratio by adopting molten salt topological chemical conversion process 3 A sheet form;
s2, adding Bi 2 O 3 、Fe 2 O 3 、TiO 2 、BaCO 3 、MnO 2 The powder is (1-x) BaFeO 3 -xBaTiO 3 After stoichiometric weighing, absolute ethyl alcohol is added for first ball milling to obtain slurry, and then the slurry is dried and calcined to prepare (1-x) BaFeO 3 -xBaTiO 3 Pre-sintering the powder, and performing secondary ball milling on the pre-sintered powder to obtain ceramic matrix powder;
s3, mixing the ceramic matrix powder obtained in the S2 with a binder, a plasticizer, a defoaming agent, a dispersing agent, absolute ethyl alcohol and a sintering aid Ba (OH) 2 ﹒8H 2 Mixing O, performing primary ball milling, and adding the BaTiO obtained by the S1 into the mixed slurry 3 Carrying out secondary ball milling on the flaky template to obtain casting slurry;
s4, carrying out tape casting on the tape casting slurry obtained in the S3 to obtain a tape casting film;
s5, cutting the casting film obtained in the step S4 into a wafer, and then carrying out lamination and hot press molding to obtain a ceramic green body;
s6, carrying out glue discharging on the ceramic green body obtained in the S5, and then carrying out cold isostatic pressing;
and S7, carrying out cold sintering on the ceramic green body subjected to cold isostatic pressing to obtain the textured ceramic.
2. The method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramic by using cold sintering technology according to claim 1, wherein the step S1 comprises the following steps:
s11, adding Bi 2 O 3 And TiO 2 2 According to the reaction formula 2Bi 2 O 3 +3TiO 2 →Bi 4 Ti 3 O 12 Mixing the raw materials according to the proportion, ball-milling the raw materials for 10 to 24 hours by using ethanol at the ball-milling speed of 200 to 300r/min, drying the raw materials, mixing the dried raw materials with KCl/NaCl with the same mass and the molar ratio of 1:1 in the ethanol, uniformly stirring the mixture, drying and sieving the mixture, putting the mixture into a crucible, preserving the temperature for 1 hour at 1050 ℃, repeatedly washing the mixture by using hot deionized water to remove salt to obtain Bi 4 Ti 3 O 12 A precursor;
s12, preparing Bi obtained in S11 4 Ti 3 O 12 Precursor and TiO 2 、BaCO 3 According to the reaction formula Bi 4 Ti 3 O 12 +BaCO 3 +TiO 2 →BaBi 4 Ti 4 O 15 +CO 2 Mixing the raw materials according to the proportion, then gently and uniformly stirring the mixture with NaCl/KCl with the same mass and the molar ratio of 1:1 in ethanol, drying and sieving the mixture at 950-1050 ℃ for 2-3h, and repeatedly washing the mixture with hot deionized water to remove salt to obtain BaBi 4 Ti 4 O 15 A precursor;
s13, baBi obtained from S12 4 Ti 4 O 15 Precursor and BaCO 3 Mixing according to the molar ratio of 1:4, then stirring with KCl/NaCl with the same mass and the molar ratio of 1:1 in ethanol gently and uniformly, drying, sieving, keeping the temperature at 900-950 ℃ for 3h, and repeatedly cleaning with 1mol/L dilute nitric acid to remove Bi 2 O 3 Finally, washing with deionized water to obtain BaTiO 3 Lamellar crystallites.
3. The method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramic by using the cold sintering technology as claimed in claim 1, wherein in step S2, the grinding balls used for ball milling are zirconium balls, the rotation speed of the ball mill is 200-300r/min, and the ball milling time is 15-24h.
4. The method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramic by using the cold sintering technology as claimed in claim 1, wherein in step S2, slurry obtained by the first ball milling is dried by an oven, and then is subjected to heat preservation at 750-800 ℃ for 3-5h to be calcined to prepare (1-x) BaFeO3-xBaTiO3 pre-sintered powder.
5. The method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramics by using a cold sintering technology as claimed in claim 1, wherein in step S3, dibutyl phthalate is adopted as a dispersing agent, n-butanol is adopted as a defoaming agent, polyvinyl butyral is adopted as a binder, polyethylene glycol is adopted as a plasticizer, and ceramic matrix powder: anhydrous ethanol: dibutyl phthalate: n-butanol: polyvinyl butyral: polyethylene glycol: baTiO 2 3 The mass ratio of the flaky template is 1: (0.7-1.4): (0.0021-0.006): (0.002-0.006): (0.005-0.1): (0.006-0.06): (0.01-0.3), sintering aid Ba (OH) 2 ﹒8H 2 The content of O is 12-16wt% of the ceramic matrix powder.
6. The method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramic by using the cold sintering technology as claimed in claim 1, wherein in the step S3, ball milling is performed in a ball milling tank, the first ball milling is performed for 15-20h, and the second ball milling is performed for 15-30 min.
7. The method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramic by using cold sintering technology as claimed in claim 1, wherein in step S4, the casting slurry is cast by a 200 μm doctor blade on a casting machine to obtain a casting film, the casting speed is 0.6cm/S-2cm/S, and the thickness of the casting film is 60-500 μm.
8. The method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramic by using cold sintering technology as claimed in claim 1, wherein in step S5, the diameter of the cut wafer is 10mm, and the thickness of the ceramic green body obtained by laminating and hot press molding is 400-800 μm.
9. The method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramic by using cold sintering technology as claimed in claim 1, wherein in step S6, the temperature rise rate is 0.1-0.5 ℃/min during the glue discharging process, the temperature is kept at 150-200 ℃ for 0.5-2h, the temperature is kept at 400-450 ℃ for 0.5-2h, the temperature is kept at 550-600 ℃ for 0.5-2h, the pressure of cold isostatic pressing is 100-300MPa, and the time is 1-10min.
10. The method for preparing bismuth ferrite-barium titanate piezoelectric textured ceramic by using the cold sintering technology as claimed in claim 1, wherein in step S7, the ceramic green body is subjected to cold sintering at a pressure of 400MPa and at temperatures of 200 ℃, 250 ℃, 300 ℃ and 350 ℃ respectively, and the temperature is kept for 1 hour to obtain the textured ceramic.
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