A high uniformity emulsion type ceramic slurry and a method for preparing the same

Abstract

The application discloses a kind of high uniformity emulsified ceramic slurry and preparation method thereof, comprising the following steps: S1 dispersant configuration: polyacrylic acid is mixed with collagen polypeptide aqueous solution according to the proportion of 10-15:1, equal volume of ultrapure water is added as solvent, stirring is uniformly, and dispersant is obtained;S2 ceramic slurry configuration: ceramic powder is weighed according to stoichiometric ratio, 0.2-1.0wt.% dispersant of ceramic powder is added, the volume solid content of ceramic slurry is adjusted to 14-18vol.% by adding ultrapure water, then ball milling is carried out, and emulsified ceramic slurry can be obtained;S3 ceramic slurry post-treatment: emulsified ceramic slurry is added to 1.0-1.5wt.% polypropylene glycol of ceramic powder, then water is removed, and the final ceramic slurry can be obtained after stirring.The preparation method can directly realize the preparation of long-acting stable, multi-bubble emulsified ceramic slurry, solve the preparation problems of ceramic slurry, such as difficult to store, poor uniformity, poor stability, etc., and the preparation process is simple and easy to industrial production.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of advanced functional ceramic preparation, and particularly relates to a high-uniformity emulsified ceramic slurry and a preparation method thereof. BACKGROUND

[0002] Functional ceramic materials are medium materials with electrical, magnetic, optical, acoustic, thermal, mechanical, chemical or biological functions, and are key basic materials in modern high-tech fields such as electronic information, integrated circuits, mobile communications, energy technology and national defense and military industry, and have important strategic significance for the development of China's information industry and the enhancement of the country's overall strength. In the production and preparation process of ceramic products, functional ceramic materials must be shaped according to product requirements, and the shaping process determines the difficulty of ceramic products in subsequent processing.

[0003] At present, ceramic shaping processes are divided into dry and wet methods according to whether a liquid part is involved. Dry shaping process is to directly add ceramic powder into a steel mold or an elastic mold, and then press the ceramic powder into a certain shaped body by a pressing device such as a hydraulic machine or high-pressure liquid. However, the dry shaping process is too dependent on the shape of the mold, and functional ceramic materials are mostly in the form of complex structures such as ultra-thin, ultra-long aspect ratio, layered and sheet-shaped in actual application, so it is difficult to prepare functional ceramic materials with complex structures by dry pressing. Therefore, most functional ceramics are produced by wet shaping process.

[0004] Wet shaping is to add dispersants, solvents, binders, plasticizers, gelling agents, etc. during the shaping process of ceramic powder, and to prepare slurry for ceramic shaping process; its advantages mainly lie in that it can accurately control the shaping precision of the body, can prepare ceramic bodies with complex structures, and can meet the production and application needs of functional ceramic materials. Typical wet shaping processes mainly include slip casting, gel casting and tape casting.

[0005] However, in the process of ceramic wet shaping, ceramic slurry is prone to failure, causing a lot of resource waste and environmental pollution. The slurry prepared by enterprises cannot be used the next day and must be prepared on site, which easily causes a lot of waste, and the slurry cannot be recycled once it fails. The reason is that the ceramic powder particles in the slurry system are adsorbed / aggregated to form large particles, resulting in delamination / settling and causing the failure of the ceramic slurry. Although the agglomeration of the powder particles is broken by the dispersant, the steric hindrance effect or electrostatic steric hindrance effect caused by the dispersant adsorbed on the surface of the powder is easily weakened under the interference of external environment such as temperature, environmental pH, mechanical shear stress and other factors, resulting in the failure of the slurry system.

[0006] To solve the above problems, domestic and foreign scholars focus on the development of new system dispersant or new slurry dispersion scheme, dry science and so on adopts dispersant invalid in situ solidification injection molding preparation silicon carbide ceramic, but this scheme can be short, easy to failure; A method for long-term storage of ceramic gel injection molding slurry (patent number: CN 107140992A) discloses a method for preparing ceramic slurry by using DBP, but this method needs continuous ball milling to be stored for a long time, and the slurry will fail if the ball milling time exceeds 5 days. SUMMARY

[0007] In view of the above problems, the purpose of the present application is to provide a high uniformity emulsified ceramic slurry and its preparation method, which uses polypropylene dispersant to directly realize the preparation of long-acting stable and multi-bubble emulsified ceramic slurry, solves the problems of difficult storage, poor uniformity and poor stability of ceramic slurry, and has simple preparation process, no need for vacuum debubbling treatment, no special requirements for storage environment, and therefore easy industrial production; The organic matter used in the present application can be completely removed in air environment and will not have any effect on subsequent ceramic sintering.

[0008] To solve the above technical problems, the following technical solutions are adopted:

[0009] One object of the present application is to provide a high uniformity emulsified ceramic slurry, and its preparation method comprises the following steps:

[0010] S1 dispersant configuration: mix polyacrylic acid and collagen polypeptide aqueous solution in proportion, adjust the ratio of polyacrylic acid to polypeptide solution to 10-15, add equal volume of ultrapure water as solvent, stir uniformly, and the dispersant is obtained;

[0011] S2 ceramic slurry configuration: take ceramic powder according to stoichiometric ratio, add 0.2-1.0wt.% of the dispersant based on the mass of the ceramic powder, add ultrapure water as solvent, adjust the volume solid content of the ceramic slurry to 14-18vol.%, and then ball mill, to obtain multi-bubble, high dispersibility, long-acting stable emulsified ceramic slurry;

[0012] S3 ceramic slurry use: add 1.0-1.5wt.% of polypropylene glycol based on the mass of the ceramic powder to the emulsified ceramic slurry obtained in step S2, then remove water according to the required solid content of the ceramic slurry, and then stir with a high-speed disperser, to obtain ceramic slurry without bubbles, high dispersibility and no particle agglomeration.

[0013] S4 ceramic forming: form the ceramic slurry obtained in step S3 according to the requirements of water-based wet forming process to obtain ceramic green body, and then prepare the required ceramic product according to the preparation process requirements.

[0014] Further, in step S1, the concentration of the collagen polypeptide aqueous solution is 20-30%.

[0015] Further, in step S1, the stirring is performed using a magnetic stirrer, the stirring temperature is 60-80 DEG C, and the stirring time is 15-30 min.

[0016] Further, in step S2, the ball milling time is 15-20 h, the ball milling mode is planetary ball milling, the ratio of the ball milling medium to the ball milling material is 3-5, and the diameter of the ball milling medium is 3-5 mm.

[0017] Further, in step S2, the total volume of the ball milling medium, the ball milling material and the ball milling solvent is more than 1 / 3 of the volume of the ball milling tank and less than 2 / 3 of the volume of the ball milling tank.

[0018] Further, in step S3, the ceramic slurry is used, the polypropylene glycol is used to completely cover the surface layer of the slurry, then the water is removed, and the vacuum drying box or the air blowing drying box is used for drying, and the drying stage temperature is 50-70 DEG C.

[0019] Further, in step S3, the solid content of the ceramic slurry is 45-60 vol.%, according to the subsequent forming process.

[0020] Further, in step S3, the vacuum drying box or the air blowing drying box is used for drying, the drying stage needs to be sealed by using the fresh-keeping bag to seal the drying dish, then a plurality of air outlets are opened, and the size of the air outlet should be less than 3 mm.

[0021] Further, in step S3, the rotation speed of the high-speed disperser is 2000-2500 r / min, and the stirring time is 2-4 h.

[0022] Another object of the present application is to provide an application of the high-uniformity emulsified ceramic slurry, and the ceramic slurry prepared above is used for ceramic forming: the ceramic slurry in step S3 is added with high-molecular organic matter, which is uniformly stirred to form a ceramic slurry that can be used for forming, then the ceramic slurry is formed, the formed body is treated according to product requirements, then the debinding and glue removal are performed, and the ceramic green body that can be used for sintering is obtained, and the ceramic is sintered and annealed according to the process, and the final required ceramic product is obtained.

[0023] Further, the forming process of the ceramic slurry is a tape casting process, and the steps are as follows: PVA is configured into a 10% PVA aqueous solution, 5-8% PVA by mass of the powder is added to the ceramic slurry prepared in step S3, 5-8% plasticizer PEG-400 is added, stirring is performed, the stirring speed is 600-1000 r / min, the stirring time is 6-10 h, the ceramic slurry obtained is vacuum degassed, and then tape casting is performed to obtain the desired tape casting ceramic green body.

[0024] Further, the forming process of the ceramic slurry is a gel injection molding process, and the steps are as follows: 1-5% Isobam104 is added to the ceramic slurry prepared in step S3, stirring is performed, the stirring speed is 600-1000 r / min, the stirring time is 6-10 h, the ceramic slurry obtained is vacuum degassed, and then injection molding is performed to obtain the desired gel injection molding ceramic green body.

[0025] Further, the processing of the green body after forming includes cutting and stacking, and then the stacked ceramic is compounded by using a warm isostatic pressing machine, the warm isostatic pressing pressure is 40-80 MPa, and the temperature is 80-95 DEG C.

[0026] The debinding and glue removal are performed at a temperature of 800-900 DEG C, and the ceramic green body for sintering can be obtained after 6-8 h of heat preservation.

[0027] The sintering is performed by using a vacuum sintering furnace, the sintering temperature is 1780 DEG C, the heat preservation time is 8 h, the ceramic product is obtained, the ceramic is annealed at an annealing temperature of 1250-1500 DEG C, the heat preservation time is 10-30 h, and the final desired transparent ceramic is obtained.

[0028] The present application has the following advantages:

[0029] (1) The high-dispersion emulsified ceramic slurry prepared by the present application is in a solid-like state without shear stress, has the characteristics of uniform powder dispersion, slurry non-settlement, stability and the like, and there is no difference between the ceramic prepared by using the slurry stored for 10 days and the ceramic prepared by using fresh slurry.

[0030] (2) The emulsified ceramic slurry prepared by the present application can be stored for a long time, has a high operability and repeatability in the emulsified state with many bubbles in the early stage, and can be directly used in the later stage of ceramic preparation, and the slurry is restored before ceramic preparation, polyethylene glycol is used as a defoaming agent, the slurry is converted from the stable storage emulsified state into a solution state, and the solution state is used.

[0031] (3) This invention solves the problems of difficult storage, poor uniformity and poor stability of ceramic slurry. This invention uses collagen peptides, which can undergo graft copolymerization with polyacrylic acid to form a modified polyacrylic acid dispersant. This dispersant has the dispersing effect of polyacrylic acid and can be adsorbed on the powder surface. It also contains long chains of collagen peptides. After the ball milling of the slurry is stopped, due to the mutual repulsion mechanism of the long peptide chains, the powder is prevented from settling (so that the powder in the slurry is suspended in situ), thus improving the stability of the slurry.

[0032] (4) The organic matter used in this invention can be completely removed in the air environment and will not have any effect on ceramic sintering.

[0033] (5) The ceramic slurry prepared by the present invention can be made by adding high molecular organic matter according to product requirements, and then the ceramic slurry suitable for molding can be prepared by stirring with a high-speed disperser. The prepared slurry has no blocky particles, and the prepared ceramic blank is no different from the traditional molding process.

[0034] (6) The preparation process of this invention is simple, has no strict requirements on water, does not require vacuum defoaming treatment, and has no special requirements on storage environment, thus it is easy to industrialize. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 The image shows a physical picture of a highly uniform emulsified ceramic slurry prepared in Example 1 of the present invention before drying. (A) is a side view and (B) is a top view. As can be seen from the figure, under no shear force, the long-lasting, multi-bubble emulsified ceramic slurry presents a solid-like state with no fluidity and no sedimentation.

[0037] Figure 2 The image shows a dried ceramic slurry of a highly uniform emulsified ceramic slurry prepared in Example 1 of this invention. As can be seen from Figures (C) and (D), the surface indentations of the ceramic slurry are clearly visible. Compared with the fresh slurry, there is no change, indicating that the slurry has good long-term stability and is suitable for long-term storage.

[0038] Figure 3 The image shows the ceramic slurry (E) and the ceramic green body (F) prepared in Example 1 of this invention, which can be used for casting. As can be seen from the image, the properties of the ceramic slurry have been fully restored, and the cast green body has good flexibility and is free from defects such as cracking, warping, and peeling.

[0039] Figure 4 Nd:YAG ceramic rod prepared for the embodiment 2 of the present application, wherein (a) is a fresh green body prepared by gel casting, (b) is a dried ceramic green body, (c) is a sample after vacuum sintering with a diameter of 11 mm and a length of 190 mm, (d) is a sample after CNC machining with a diameter of 8 mm and a length of 160 mm and the transmittance diagram, from which it can be seen that the green body prepared by the present application has good optical performance and can completely achieve the effect of the traditional gel casting process for preparing ceramics. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0041] In the following embodiments, the ball milling method for preparing the ceramic slurry is planetary ball milling, and the ratio of the ball milling medium to the ball milling powder is 3-5, and the diameter of the ball milling medium is 3-5 mm; the total volume of the ball milling medium, the ball milling material and the ball milling solvent should be more than 1 / 3 of the volume of the ball milling tank and less than 2 / 3 of the volume of the ball milling tank;

[0042] When the ceramic slurry is used, a vacuum drying oven or a blowing type drying oven is used, the drying stage uses a temperature of 50-70℃, and the drying stage needs to use a preservative bag to seal the drying dish first, and then multiple air outlets are opened, and the size of the air outlet should not be greater than 3 mm.

[0043] The steps of the tape casting process are as follows: PVA is configured into a 10% PVA aqueous solution, 5-8% PVA by mass of the powder is added to the slurry prepared in step S3, 5-8% plasticizer PEG-400 is added, stirring is performed, the stirring speed is 600-1000 r / min, the obtained slurry is vacuum degassed, and then tape casting is performed to obtain the required tape casting ceramic green body, the green body is cut and stacked according to product requirements; the stacked ceramic is compounded using a warm isostatic pressing machine, the warm isostatic pressing pressure is 40-80 Mpa, and the temperature is 80-95℃, the green body of the ceramic required by the product is obtained, the green body is subjected to debinding and glue removal, the debinding and glue removal temperature is 800-900℃, the green body is kept for 6-8 h, and then a vacuum sintering furnace is used for sintering, the sintering temperature is 1780℃, and the sintering is kept for 8 h, the ceramic product is obtained, the ceramic is annealed, the annealing temperature is 1250-1500℃, and the annealing is kept for 10-30 h, and the final required transparent ceramic is obtained.

[0044] The gel casting molding process steps are as follows: 1-5% of Isobam104 is added to the slurry prepared in step S3 and stirred for 6-10 hours at a stirring speed of 600-1000 r / min; the resulting slurry is vacuum degassed and then cast to obtain the desired gel casting molded ceramic blank; the blank is processed according to product requirements to obtain the ceramic blank required for the product; the blank is degreased and degummed at a temperature of 800-900℃ for 6-8 hours; then it is sintered in a vacuum sintering furnace at a temperature of 1780℃ for 8 hours to obtain the ceramic product; the ceramic is annealed at a temperature of 1250-1500℃ for 10-30 hours to obtain the final transparent ceramic.

[0045] Example 1

[0046] A highly uniform ceramic slurry is prepared by the following steps:

[0047] (1) Dispersant preparation: Mix commercial polyacrylic acid and polypeptide aqueous solution in a certain proportion, adjust the ratio of polyacrylic acid to polypeptide solution to 10, add an equal volume of ultrapure water as solvent, stir with a magnetic stirrer at a temperature of 70°C for 30 minutes, and a dispersant that can be used to prepare ceramic slurry can be obtained.

[0048] (2) Preparation of ceramic slurry: Weigh 500g of commercial YAG transparent ceramic mixed powder, add 5g of the dispersant obtained in step (1), add 650g of ultrapure water as solvent, and adjust the volume solids content of the ceramic slurry to 14.4 vol.% (YAG powder volume is based on a theoretical density of 4.55 g / cm³). 3 (Calculations are performed), and then ball milling is carried out for 15 hours to obtain a highly dispersible, long-lasting, stable, and multi-bubble emulsified ceramic slurry.

[0049] (3) Use of ceramic slurry: Weigh the slurry obtained in step (2) to a weight of 862g, add 5.54g of polypropylene glycol powder, and completely cover the surface of the slurry with polypropylene glycol. Then remove water according to the required solid content of 47wt.% for casting molding slurry, and remove water by a weight of 300g. Then use a high-speed disperser to stir, with a speed of 2000r / min and a stirring time of 4h, to obtain a ceramic slurry without bubbles, high dispersion, and no particle agglomerates.

[0050] (4) Ceramic forming: add 10% PVA aqueous solution 221.77 g, add plasticizer 17.00 g, then stir, stirring speed is 750 r / min, stirring time is 8 h, ceramic slurry for tape casting can be obtained; the obtained slurry is tape casted, the green body after forming is treated according to product requirements, then laminated, warm isostatic pressing, degreasing and glue removal, ceramic blanks for sintering can be obtained, the ceramic is sintered and annealed according to the process, YAG transparent ceramic prepared by water-based tape casting can be obtained.

[0051] Example 2

[0052] (1) Dispersant configuration: mix commercial polyacrylic acid with polypeptide aqueous solution according to the proportion, adjust the ratio of polyacrylic acid to polypeptide solution to 10, add equal volume of ultrapure water as solvent, use a magnetic stirrer to stir, stirring temperature is 70°C, stirring time is 30 min, a dispersant for ceramic slurry configuration can be obtained;

[0053] (2) Ceramic slurry configuration: weigh commercial Nd:YAG transparent ceramic mixed powder, the powder mass is 500 g, add 1 g of dispersant obtained in step (1) to the powder, add ultrapure water as solvent, the amount of ultrapure water added is 650 g, adjust the volume solid content of the ceramic slurry to 14.4 vol.% (the volume of Nd:YAG powder is calculated according to the theoretical density 4.55 g / cm 3 ), then ball mill for 15 h, an emulsified ceramic slurry with high dispersity, long-term stability and multiple bubbles can be obtained;

[0054] (3) Ceramic slurry use: weigh the slurry obtained in step (2), the mass is 849 g, add polypropylene glycol 5.5 g, then remove water according to the required mass solid content 68 wt.% for gel casting, then use a high-speed disperser to stir, the speed of the high-speed disperser is 2500 r / min, the stirring time is 3 h, a ceramic slurry without bubbles, high dispersity and no particle agglomeration block can be obtained;

[0055] (4) Ceramic forming: add 7.36 g of Isobam 104, stir for 6 h, a ceramic slurry for gel casting can be obtained; the obtained slurry is gel casted, then degreased and glue removed, vacuum sintered, Nd:YAG transparent ceramic prepared by water-based gel casting can be obtained.

[0056] Figure 1A high uniformity emulsified ceramic slurry prepared by the embodiment 1 of the present application is shown in the ceramic slurry physical map before drying, wherein (A) is a side view and (B) is a top view. It can be seen from the figure that the long-acting, multi-bubble emulsified ceramic slurry is in a solid-like state without flowability and sedimentation under the action of no shear force;

[0057] Figure 2 A high uniformity emulsified ceramic slurry prepared by the embodiment 1 of the present application is shown in the ceramic slurry physical map after drying. It can be seen from the figure that the ceramic slurry surface layer indentation is clearly visible, and the fresh slurry has no any change, indicating that the slurry has good long-acting stability and is suitable for long-term storage.

[0058] Figure 3 The ceramic slurry (E) prepared by the embodiment 1 of the present application and the cast ceramic green body (F) are shown in the physical map. It can be seen from the figure that the performance of the ceramic slurry has been completely restored, and the prepared cast green body has good flexibility without cracking, warping, peeling and other defects.

[0059] Figure 4 The Nd:YAG ceramic rod prepared by the embodiment 2 of the present application is shown in the figure, wherein (a) is a fresh green body prepared by gel casting, (b) is a dried ceramic green body, (c) is a φ11x190mm vacuum sintered sample, (d) is a φ8x160mm CNC processed sample and a transmittance diagram. It can be seen from the figure that the green body prepared by the present application has good optical performance and can completely achieve the effect of the traditional ceramic prepared by gel casting process.

[0060] The emulsified ceramic slurry prepared in step (2) can be stored for a long time, but cannot be used for preparing ceramic. The slurry needs to be restored for ceramic preparation. The polyethylene glycol is used as a defoaming agent to restore the slurry from the multi-bubble emulsified state to the liquid state, and to change the slurry from the stable storage emulsified state to the solution state, and to use the slurry in the solution state.

[0061] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A highly uniform emulsified ceramic slurry, characterized in that, Its preparation method includes the following steps: S1 dispersant preparation: Mix polyacrylic acid and collagen peptide aqueous solution in a certain proportion, adjust the ratio of polyacrylic acid to collagen peptide aqueous solution to 10~15, add an equal volume of ultrapure water as solvent, stir evenly, stir temperature is 60~80 ℃, stir time is 15~30 min, and the dispersant is obtained. S2 Ceramic Slurry Preparation: Weigh the ceramic powder according to the stoichiometric ratio, add 0.2~1.0 wt.% of the dispersant by mass of the ceramic powder, add ultrapure water as a solvent, adjust the volume solid content of the ceramic slurry to 14~18 vol.%, and then ball mill to obtain a multi-bubble, highly dispersible, long-lasting stable emulsified ceramic slurry; S3 Ceramic Slurry Application: Add 1.0~1.5 wt.% of polypropylene glycol to the emulsified ceramic slurry obtained in step S2, then remove water according to the required solid content of the ceramic slurry, and then stir using a high-speed disperser to obtain a ceramic slurry without bubbles, high dispersibility, and no particle agglomeration.

2. The highly uniform emulsified ceramic slurry as described in claim 1, characterized in that, Step S1: The concentration of the collagen peptide aqueous solution is 20-30%.

3. The highly uniform emulsified ceramic slurry as described in claim 2, characterized in that, In step S1, a magnetic stirrer is used for stirring.

4. The highly uniform emulsified ceramic slurry as described in claim 1, characterized in that, In step S2, the ball milling time is 15-20 hours, the ball milling method is planetary ball milling, and the ratio of ball milling media to ball milling powder is 3-5. The diameter of the ball milling media is 3-5 mm. The total volume occupied by the ball milling media, the ball milling material, and the ball milling solvent must exceed 1 / 3 of the volume of the ball milling jar and be less than 2 / 3 of the volume of the ball milling jar.

5. The highly uniform emulsified ceramic slurry as described in claim 1, characterized in that, In step S3, the ceramic slurry is first used by completely covering the surface of the slurry with polypropylene glycol, then removing the moisture, and drying it using a vacuum drying oven or a forced-air drying oven at a temperature of 50~70 ℃.

6. The highly uniform emulsified ceramic slurry as described in claim 1, characterized in that, In step S3, the solid content of the ceramic slurry is 45~60 vol., depending on the subsequent molding process.

7. The application of the highly uniform emulsified ceramic slurry according to claim 1, characterized in that, The prepared ceramic slurry is used for ceramic molding: a high molecular organic compound is added to the ceramic slurry described in step S3, and the mixture is stirred evenly to prepare a ceramic slurry that can be used for molding. The ceramic slurry is then molded, and the molded green body is processed. Then, degreasing and debinding are performed to obtain a ceramic green body that can be used for sintering. The ceramic is then sintered and annealed to obtain the final ceramic product.

8. The application of the highly uniform emulsified ceramic slurry according to claim 7, characterized in that, The ceramic slurry is formed by tape casting, and the steps are as follows: PVA is prepared into a 10% PVA aqueous solution, 5-8% of the powder mass of PVA is added to the ceramic slurry prepared in step S3, 5-8% of the plasticizer PEG-400 is added, and the mixture is stirred for 6-10 h at a stirring speed of 600-1000 r / min; the obtained ceramic slurry is degassed under vacuum, and then tape cast to obtain the desired tape cast ceramic blank.

9. The application of the highly uniform emulsified ceramic slurry according to claim 7, characterized in that, The ceramic slurry is formed by gel casting molding, and the steps are as follows: 1~5% of Isobam104 is added to the ceramic slurry prepared in step S3, and stirred for 6~10 h at a stirring speed of 600~1000 r / min; the obtained ceramic slurry is degassed under vacuum, and then cast to obtain the desired gel casting molded ceramic blank.

10. The application of the highly uniform emulsified ceramic slurry according to claim 7, characterized in that, The preforms are processed by cutting and stacking, and then the stacked ceramics are composited using a warm isostatic press. The warm isostatic pressing pressure is 40~80 MPa and the temperature is 80~95 ℃. The degreasing and debinding process is carried out at a temperature of 800~900 ℃ and held for 6~8 h to obtain a ceramic blank that can be used for sintering. The sintering process involves using a vacuum sintering furnace at a temperature of 1780 ℃ for 8 hours to obtain a ceramic product. The ceramic is then annealed at a temperature of 1250~1500 ℃ for 10~30 hours to obtain the final transparent ceramic.

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