A method for preparing a multiphase ceramic slurry

Abstract

The application relates to the technical field of ceramic materials, in particular to a preparation method of a composite ceramic slurry, which comprises the following steps: S1, powder pretreatment, S2, preparation of a pre-solution, S3, preparation of a powder slurry, and S4, post-treatment. In the application, the water and impurities adsorbed on the surface of mixed powder of boron carbide and titanium diboride are removed through vacuum heat treatment, the surface state of the powder is improved, the castor oil derivative dispersant and the alkyl phenol polyoxyethylene ether which are subsequently added can be more effectively adsorbed and anchored on the surface of the powder, the selective agglomeration caused by the poor physical properties of the powder is inhibited from the root, the slurry viscosity is stable and controllable, meanwhile, through the vacuum stirring defoaming process in the post-treatment stage, the formed green body has high density and few defects, the mechanical performance consistency of the product is good, and the problem that the green body quality and performance consistency cannot be guaranteed due to uneven powder dispersion and unstable slurry system in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of ceramic materials technology, specifically to a method for preparing a multiphase ceramic slurry. Background Technology

[0002] Boron carbide is an ultra-hard, lightweight ceramic material. Its hardness at room temperature is second only to diamond and cubic boron nitride, and its density is only 2.52 g / cm³. 3 Titanium diboride possesses high melting point, high wear resistance, strong neutron absorption capacity, and excellent chemical stability, making it widely used in bulletproof armor, high-temperature structural components, wear-resistant parts, and grinding tools. Titanium diboride also exhibits high hardness, with fracture toughness and bending strength significantly superior to boron carbide. Furthermore, it exhibits good wettability and thermophysical property matching with boron carbide, making it an ideal second-phase reinforcing component. Therefore, boron carbide-titanium diboride multiphase ceramic slurry prepared by dispersing titanium diboride as a hard reinforcing phase in a boron carbide matrix can be used to prepare complex-shaped ceramic components such as bulletproof inserts and wear-resistant seals through colloidal molding processes.

[0003] In existing technologies, boron carbide and titanium diboride powders have certain differences in physical properties, making it difficult to achieve uniform co-dispersion during slurry preparation. Solid particles are prone to selective agglomeration, resulting in large viscosity fluctuations and system instability. Entrained air bubbles are difficult to remove, ultimately leading to low density and numerous defects in the formed green body, making it difficult to guarantee the consistency of the product's mechanical properties. Therefore, this invention provides a method for preparing a multiphase ceramic slurry. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing multiphase ceramic slurry to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing a multiphase ceramic slurry, comprising the following steps: S1: Powder pretreatment, the powder is selected from boron carbide and titanium diboride, the powder is pretreated to obtain the pre-prepared material; S2: Pre-solution preparation, the raw materials of the pre-solution include a first mixture and a second mixture. The raw materials of the first mixture include anhydrous ethanol, dioctyl phthalate, glycerol and polyvinyl butyral, and the raw materials of the second mixture include anhydrous ethanol and aluminum acetylacetonate. S3: Preparation of powder slurry: Anhydrous ethanol, castor oil derivative dispersant, alkylphenol polyoxyethylene ether and preparative materials are mixed and ball-milled to obtain powder slurry; S4: Post-processing: The powder slurry and pre-solution are post-processed to obtain a multiphase ceramic slurry.

[0006] Preferably, the mass fraction of boron carbide is 150-160 parts and the mass fraction of titanium diboride is 20-25 parts.

[0007] Preferably, boron carbide powder with two particle sizes is used, wherein fine powder with a particle size of 0.5 μm accounts for 70-75%, and the remainder is supplemented by coarse powder with a particle size of 3 μm to make up 100%, and titanium diboride with a particle size of 1 μm is used.

[0008] Preferably, the powder pretreatment method is as follows: weigh boron carbide and titanium diboride and add them to a mixer, set the stirring speed to 100-160 rpm and stir for 20-30 minutes, place the resulting product in a vacuum heat treatment furnace, keep it at 800°C for 2 hours, and let it cool naturally with the furnace to complete the powder pretreatment and obtain the pre-processed material.

[0009] Preferably, the method for preparing the presol is as follows: anhydrous ethanol is poured into a beaker, dioctyl phthalate and glycerol are added, and after mixing, the mixture is placed in a water bath at 55-65°C and stirred for 30-50 minutes. During the stirring process, polyvinyl butyral is added to obtain a first mixture, which is set aside. Anhydrous ethanol and aluminum acetylacetonate are mixed to obtain a second mixture, which is set aside. The first and second mixtures are mixed and stirred at 40 rpm for 10-15 minutes at 50-60°C. After that, the mixture is naturally cooled to room temperature, and the resulting product is sieved through a 150-mesh sieve to obtain the presol.

[0010] Preferably, the mass ratio of anhydrous ethanol, dioctyl phthalate, glycerol and polyvinyl butyral is 6-6.5:3-3.5:12-13:5-6, the mass ratio of anhydrous ethanol and aluminum acetylacetonate is 12-14:1, the mass ratio of the first mixture and the second mixture is 16-18:1, and the mass of the first mixture is 14-16% of the mass of the preparatory material.

[0011] Preferably, the method for preparing the powder slurry is as follows: anhydrous ethanol, castor oil derivative dispersant and alkylphenol polyoxyethylene ether are added to a mixer and stirred at 60-100 rpm for 20-30 min. Then, preparative materials are added and stirred at 160-200 rpm for 40-60 min. The resulting product and zirconia ball milling balls are added to a planetary ball mill at a ball-to-material ratio of 3:1 and ball milled at 300-400 rpm for 2-3 h to obtain the powder slurry.

[0012] Preferably, the mass ratio of anhydrous ethanol, castor oil derivative dispersant and alkylphenol polyoxyethylene ether is 180-190:18-22:1, and the mass of anhydrous ethanol is 10-12% of the mass of the prepared material.

[0013] Preferably, the post-processing method is as follows: the pre-solution is added to the powder slurry, and ball milling is continued. The resulting product is transferred to a vacuum mixer and stirred and defoamed for 20 to 30 minutes under the conditions of -0.095 MPa and 200 to 300 rpm. After the post-processing, a multiphase ceramic slurry is obtained.

[0014] Preferably, in the preparation method of the multiphase ceramic slurry, the ball milling process is set at 300-400 rpm for 2-3 hours, followed by ball milling at 50-100 rpm for 1-2 hours.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, vacuum heat treatment of the mixed boron carbide and titanium diboride powder removes the moisture and impurities adsorbed on the powder surface, improving the powder surface condition. This allows the subsequently added castor oil derivative dispersant and alkylphenol polyoxyethylene ether to be more effectively adsorbed and anchored on the powder surface, producing a synergistic dispersion effect. This significantly improves the co-dispersion uniformity of the two powders in the slurry system, fundamentally suppressing selective agglomeration caused by differences in powder properties. This makes the slurry viscosity stable and controllable. At the same time, the vacuum stirring and defoaming process in the post-treatment stage achieves efficient removal of bubbles, thereby ensuring high density and few defects in the molded green body, and good consistency of the mechanical properties of the product. This solves the problem in the prior art where it is difficult to guarantee the consistency of green body quality and performance due to uneven powder dispersion and unstable slurry system.

[0016] 2. In this invention, a pre-solution is formed by introducing a first mixture consisting of anhydrous ethanol, dioctyl phthalate, glycerol, and polyvinyl butyral, and a second mixture consisting of anhydrous ethanol and aluminum acetylacetonate. This pre-solution is added after the powder slurry is prepared and then subjected to graded ball milling. This allows the pre-solution components to be fully homogenized in the slurry, effectively improving the molding suitability and green body strength of the slurry. At the same time, it gives the slurry good storage stability, which is beneficial to the stable implementation of subsequent colloidal molding processes.

[0017] 3. In this invention, the preparation method is clear and the operation is controllable. From powder pretreatment, presol preparation, powder slurry preparation to post-treatment, all can be completed on conventional equipment. The batch reproducibility is good, and kilogram-level batch preparation can be achieved according to the reactor volume, which is suitable for industrial production. Attached Figure Description

[0018] Figure 1 The viscosity test results are for the multiphase ceramic slurries prepared in Examples 1, 2, and 3. Figure 2 This is a macroscopic view of the multiphase ceramic slurry prepared in Example 1; Figure 3 A macroscopic view of the multiphase ceramic slurry prepared in Example 2; Figure 4 This is a macroscopic view of the multiphase ceramic slurry prepared in Example 3. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that the raw materials used in the following embodiments are all commercially available.

[0021] Example 1:

[0022] A method for preparing a multiphase ceramic slurry includes the following steps: S1: Powder pretreatment. Boron carbide and titanium diboride are selected as powders. The powders are pretreated to prepare a pre-material. The mass fraction of boron carbide is 150 parts and the mass fraction of titanium diboride is 20 parts. Two types of boron carbide powder with different particle sizes are selected. Fine powder with a particle size of 0.5 μm accounts for 70%, and the remainder is supplemented by coarse powder with a particle size of 3 μm to make up 100%. Titanium diboride powder with a particle size of 1 μm is selected. Further, the powder pretreatment method is as follows: weigh boron carbide and titanium diboride and add them to the mixer, set the stirring speed to 100 rpm and stir for 20 min. Place the resulting product in a vacuum heat treatment furnace and keep it at 800℃ for 2 h. Let it cool naturally with the furnace to complete the powder pretreatment and obtain the pre-prepared material. S2: Pre-solution preparation, the raw materials of the pre-solution include a first mixture and a second mixture. The raw materials of the first mixture include anhydrous ethanol, dioctyl phthalate, glycerol and polyvinyl butyral, and the raw materials of the second mixture include anhydrous ethanol and aluminum acetylacetonate. Further, the method for preparing the presol is as follows: Anhydrous ethanol is poured into a beaker, dioctyl phthalate and glycerol are added, and after mixing, the mixture is kept warm and stirred in a water bath at 55°C for 30 min. During the stirring process, polyvinyl butyral is added to obtain the first mixture, which is set aside. Anhydrous ethanol and aluminum acetylacetonate are mixed at a mass ratio of 12:1 to obtain the second mixture, which is set aside. The first and second mixtures are mixed and stirred at 40 rpm for 10 min at 50°C. After that, the mixture is naturally cooled to room temperature. The resulting product is sieved through a 150-mesh sieve to obtain the presol. The mass ratio of anhydrous ethanol, dioctyl phthalate, glycerol and polyvinyl butyral is 6:3:12:5, the mass ratio of the first mixture and the second mixture is 16:1, and the mass of the first mixture is 14% of the mass of the presol. S3: Preparation of powder slurry: Anhydrous ethanol, castor oil derivative dispersant, alkylphenol polyoxyethylene ether and preparative materials are mixed and ball-milled to obtain powder slurry; Further, the method for preparing the powder slurry is as follows: anhydrous ethanol, castor oil derivative dispersant, and alkylphenol polyoxyethylene ether are added to a mixer at a mass ratio of 180:18:1, and stirred at 60 rpm for 20 min. Then, the preparative material is added, and stirred at 160 rpm for 40 min. The resulting product is added to a planetary ball mill with zirconia ball milling balls at a ball-to-material ratio of 3:1, and milled at 300 rpm for 2 h to obtain the powder slurry. The mass of anhydrous ethanol is 10% of the mass of the preparative material. S4: Post-processing: The powder slurry and pre-solution are post-processed to obtain a multiphase ceramic slurry; Further, the post-processing method is as follows: the pre-solution is added to the powder slurry and ball milling is continued. The ball milling is set at 300 rpm for 2 hours, followed by ball milling at 50 rpm for 1 hour. The resulting product is transferred to a vacuum mixer and stirred and defoamed for 20 minutes under the conditions of -0.095 MPa and 200 rpm. After the post-processing, the multiphase ceramic slurry is obtained.

[0023] Example 2:

[0024] A method for preparing a multiphase ceramic slurry includes the following steps: S1: Powder pretreatment. Boron carbide and titanium diboride are selected as powders. The powders are pretreated to prepare a pre-material. The mass fraction of boron carbide is 155 parts and the mass fraction of titanium diboride is 23 parts. Two types of boron carbide powder with different particle sizes are selected. Fine powder with a particle size of 0.5 μm accounts for 73%, and the remainder is supplemented to 100% by coarse powder with a particle size of 3 μm. Titanium diboride powder with a particle size of 1 μm is selected. Furthermore, the powder pretreatment method is as follows: weigh boron carbide and titanium diboride and add them to the mixer, set the stirring speed to 130 rpm for 25 min, place the resulting product in a vacuum heat treatment furnace, keep it at 800℃ for 2 h, and let it cool naturally with the furnace to complete the powder pretreatment and obtain the pre-prepared material. S2: Pre-solution preparation, the raw materials of the pre-solution include a first mixture and a second mixture. The raw materials of the first mixture include anhydrous ethanol, dioctyl phthalate, glycerol and polyvinyl butyral, and the raw materials of the second mixture include anhydrous ethanol and aluminum acetylacetonate. Further, the method for preparing the presol is as follows: Anhydrous ethanol is poured into a beaker, dioctyl phthalate and glycerol are added, mixed well, and then heated in a water bath at 60°C for 40 min with stirring. During the stirring process, polyvinyl butyral is added to obtain the first mixture, which is set aside. Anhydrous ethanol and aluminum acetylacetonate are mixed at a mass ratio of 13:1 to obtain the second mixture, which is set aside. The first and second mixtures are mixed well and stirred at 40 rpm for 12 min at 55°C. After that, the mixture is naturally cooled to room temperature. The resulting product is sieved through a 150-mesh sieve to obtain the presol. The mass ratio of anhydrous ethanol, dioctyl phthalate, glycerol and polyvinyl butyral is 6.3:3.2:12.5:5.5, the mass ratio of the first mixture and the second mixture is 17:1, and the mass of the first mixture is 15% of the mass of the presol. S3: Preparation of powder slurry: Anhydrous ethanol, castor oil derivative dispersant, alkylphenol polyoxyethylene ether and preparative materials are mixed and ball-milled to obtain powder slurry; Further, the method for preparing the powder slurry is as follows: anhydrous ethanol, castor oil derivative dispersant, and alkylphenol polyoxyethylene ether are added to a mixer at a mass ratio of 185:20:1, and stirred at 80 rpm for 25 min. Then, the preparative material is added, and stirred at 180 rpm for 50 min. The resulting product is added to a planetary ball mill with zirconia ball milling balls at a ball-to-material ratio of 3:1, and milled at 350 rpm for 2.5 h to obtain the powder slurry. The mass of anhydrous ethanol is 11% of the mass of the preparative material. S4: Post-processing: The powder slurry and pre-solution are post-processed to obtain a multiphase ceramic slurry; Further, the post-processing method is as follows: the pre-solution is added to the powder slurry and ball milling is continued. The ball milling is set at 350 rpm for 2.5 h, and then at 80 rpm for 1.5 h. The resulting product is transferred to a vacuum mixer and stirred and defoamed at -0.095 MPa and 250 rpm for 25 min. After the post-processing, the multiphase ceramic slurry is obtained.

[0025] Example 3:

[0026] A method for preparing a multiphase ceramic slurry includes the following steps: S1: Powder pretreatment. Boron carbide and titanium diboride are selected as powders. The powders are pretreated to prepare a pre-material. The mass fraction of boron carbide is 160 parts and the mass fraction of titanium diboride is 25 parts. Two types of boron carbide powder with different particle sizes are selected. Fine powder with a particle size of 0.5 μm accounts for 75%, and the remainder is supplemented to 100% by coarse powder with a particle size of 3 μm. Titanium diboride powder with a particle size of 1 μm is selected. Further, the powder pretreatment method is as follows: weigh boron carbide and titanium diboride and add them to the mixer, set the stirring speed to 160 rpm for 30 min, place the resulting product in a vacuum heat treatment furnace, keep it at 800℃ for 2 h, and let it cool naturally with the furnace to complete the powder pretreatment and obtain the pre-prepared material. S2: Pre-solution preparation, the raw materials of the pre-solution include a first mixture and a second mixture. The raw materials of the first mixture include anhydrous ethanol, dioctyl phthalate, glycerol and polyvinyl butyral, and the raw materials of the second mixture include anhydrous ethanol and aluminum acetylacetonate. Further, the method for preparing the presol is as follows: Anhydrous ethanol is poured into a beaker, dioctyl phthalate and glycerol are added, and after mixing, the mixture is kept warm and stirred in a water bath at 65°C for 50 min. During the stirring process, polyvinyl butyral is added to obtain the first mixture, which is set aside. Anhydrous ethanol and aluminum acetylacetonate are mixed at a mass ratio of 14:1 to obtain the second mixture, which is set aside. The first and second mixtures are mixed and stirred at 40 rpm for 15 min at 60°C. After that, the mixture is naturally cooled to room temperature. The resulting product is sieved through a 150-mesh sieve to obtain the presol. The mass ratio of anhydrous ethanol, dioctyl phthalate, glycerol and polyvinyl butyral is 6.5:3.5:13:6, the mass ratio of the first mixture and the second mixture is 18:1, and the mass of the first mixture is 16% of the mass of the presol. S3: Preparation of powder slurry: Anhydrous ethanol, castor oil derivative dispersant, alkylphenol polyoxyethylene ether and preparative materials are mixed and ball-milled to obtain powder slurry; Further, the method for preparing the powder slurry is as follows: anhydrous ethanol, castor oil derivative dispersant, and alkylphenol polyoxyethylene ether are added to a mixer at a mass ratio of 190:22:1, and the mixture is stirred at 100 rpm for 30 min. Then, the preparative material is added, and the mixture is stirred at 200 rpm for 60 min. The resulting product is added to a planetary ball mill with zirconia grinding balls at a ball-to-material ratio of 3:1, and the mixture is ball-milled at 400 rpm for 3 h to obtain the powder slurry. The mass of anhydrous ethanol is 12% of the mass of the preparative material. S4: Post-processing: The powder slurry and pre-solution are post-processed to obtain a multiphase ceramic slurry; Further, the post-processing method is as follows: the pre-solution is added to the powder slurry and ball milling is continued. The ball milling is set at 400 rpm for 3 hours, and then at 100 rpm for 2 hours. The resulting product is transferred to a vacuum mixer and stirred and defoamed for 30 minutes under the conditions of -0.095 MPa and 300 rpm. After the post-processing, the multiphase ceramic slurry is obtained.

[0027] Comparative Example 1: The difference between this comparative example and Example 1 is that: The powder pretreatment step is omitted. The main difference from the embodiment is that the mixed powder of boron carbide and titanium diboride is not subjected to vacuum heat treatment in step S1. Instead, the untreated powder is directly used for the preparation of powder slurry in the subsequent step S3. The remaining steps and raw material ratios are the same as in the embodiment.

[0028] Comparative Example 2: The difference between this comparative example and Example 1 is that: The difference from the example is that, in the preparation of the powder slurry in step S3, castor oil derivative dispersant and alkylphenol polyoxyethylene ether are not added. Instead, anhydrous ethanol is used to mix the pre-prepared material and ball milling is performed. The remaining steps and raw material ratios are the same as in the example.

[0029] Comparative Example 3 differs from Example 1 in that: The pre-solution preparation is omitted, and the components are added directly in sequence. The difference from the example is that the pre-solution preparation in step S2 is not performed. Instead, dioctyl phthalate, glycerol, polyvinyl butyral and aluminum acetylacetonate are added directly in sequence to the powder slurry obtained in step S3, followed by the post-processing in step S4. The remaining steps and raw material ratios are the same as in the example.

[0030] Performance testing: The ceramic slurries prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to performance testing. Viscosity test: In accordance with GB / T46586-2025 standard, the viscosity of the multiphase ceramic slurry prepared in each example and comparative example was measured using a rotational viscometer. The test was carried out under constant temperature conditions of 25±1℃. A No. 4 rotor was selected and the rotor speed was set to 30 rpm. The reading was taken after the reading stabilized. Each slurry sample was measured in parallel 3 times, and the arithmetic mean was taken as the final viscosity value and recorded in Table 1. Settling stability test: The multiphase ceramic slurries prepared in each example and comparative example were injected into graduated glass settling tubes with a volume of 100mL and a sample height of 100mm. They were left to stand for 48h at a constant temperature of 25±1℃. The height of the supernatant was recorded after settling, and the percentage of settling height was calculated (settling height / initial sample height × 100%). At the same time, the slurry was visually observed to see if there was obvious solid-liquid stratification or particle settling phenomenon, and the results were recorded in Table 1.

[0031] Table 1 In performance testing, the ceramic slurries prepared using the methods of Examples 1-3 showed significantly better performance than those of Comparative Examples 1-3. This indicates that, in this invention, vacuum heat treatment of the boron carbide and titanium diboride mixed powders removes adsorbed moisture and impurities from the powder surface, improving the powder surface condition. This allows the subsequently added castor oil derivative dispersant and alkylphenol polyoxyethylene ether to be more effectively adsorbed and anchored on the powder surface, producing a synergistic dispersion effect. This significantly improves the co-dispersion uniformity of the two powders in the slurry system, fundamentally suppressing selective agglomeration caused by differences in powder properties. This results in stable and controllable slurry viscosity. Furthermore, the vacuum stirring and defoaming process in the post-treatment stage achieves efficient bubble removal, ensuring high density and few defects in the formed green body, and good consistency in the mechanical properties of the finished product. This solves the problem of powder dispersion in existing technologies. The problem of inconsistent green body quality and performance caused by uneven dispersion and unstable slurry system is addressed by introducing a first mixture of anhydrous ethanol, dioctyl phthalate, glycerol, and polyvinyl butyral, and a second mixture of anhydrous ethanol and aluminum acetylacetonate to form a pre-solution. This pre-solution is added after the powder slurry is prepared and then subjected to graded ball milling, ensuring that the pre-solution components are fully homogenized in the slurry. This effectively improves the molding suitability and green body strength of the slurry, while also giving the slurry good storage stability, which is conducive to the stable implementation of subsequent colloidal molding processes. Furthermore, the preparation method is clear and the operation is controllable. From powder pretreatment, pre-solution preparation, powder slurry preparation to post-treatment, all can be completed on conventional equipment. The batch reproducibility is good, and kilogram-level batch preparation can be achieved according to the reactor volume, making it suitable for industrial production.

[0032] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0033] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing a multiphase ceramic slurry, characterized in that: Includes the following steps: S1: Powder pretreatment, the powder is selected from boron carbide and titanium diboride, the powder is pretreated to obtain the pre-prepared material; S2: Pre-solution preparation, the raw materials of the pre-solution include a first mixture and a second mixture. The raw materials of the first mixture include anhydrous ethanol, dioctyl phthalate, glycerol and polyvinyl butyral, and the raw materials of the second mixture include anhydrous ethanol and aluminum acetylacetonate. S3: Preparation of powder slurry: Anhydrous ethanol, castor oil derivative dispersant, alkylphenol polyoxyethylene ether and preparative materials are mixed and ball-milled to obtain powder slurry; S4: Post-processing: The powder slurry and pre-solution are post-processed to obtain a multiphase ceramic slurry.

2. The method for preparing the multiphase ceramic slurry according to claim 1, characterized in that, The mass fraction of boron carbide is 150-160 parts, and the mass fraction of titanium diboride is 20-25 parts.

3. The method for preparing the multiphase ceramic slurry according to claim 1, characterized in that, Boron carbide powder with two particle sizes is selected, of which fine powder with a particle size of 0.5 μm accounts for 70-75%, and the remainder is supplemented by coarse powder with a particle size of 3 μm to make up 100%. Titanium diboride powder with a particle size of 1 μm is selected.

4. The method for preparing the multiphase ceramic slurry according to claim 1, characterized in that, The powder pretreatment method is as follows: weigh boron carbide and titanium diboride and add them to a mixer, set the stirring speed to 100-160 rpm and stir for 20-30 minutes. Place the resulting product in a vacuum heat treatment furnace and keep it at 800℃ for 2 hours. Let it cool naturally with the furnace to complete the powder pretreatment and obtain the pre-prepared material.

5. The method for preparing the multiphase ceramic slurry according to claim 1, characterized in that, The method for preparing the presol is as follows: Anhydrous ethanol is poured into a beaker, dioctyl phthalate and glycerol are added, and after mixing, the mixture is placed in a water bath at 55-65°C and stirred for 30-50 minutes. During the stirring process, polyvinyl butyral is added to obtain a first mixture, which is set aside. Anhydrous ethanol and aluminum acetylacetonate are mixed to obtain a second mixture, which is set aside. The first and second mixtures are mixed and stirred at 40 rpm for 10-15 minutes at 50-60°C. After that, the mixture is naturally cooled to room temperature. The resulting product is sieved through a 150-mesh sieve to obtain the presol.

6. The method for preparing the multiphase ceramic slurry according to claim 5, characterized in that, The mass ratio of anhydrous ethanol, dioctyl phthalate, glycerol and polyvinyl butyral is 6-6.5:3-3.5:12-13:5-6, the mass ratio of anhydrous ethanol and aluminum acetylacetonate is 12-14:1, the mass ratio of the first mixture and the second mixture is 16-18:1, and the mass of the first mixture is 14-16% of the mass of the preparatory material.

7. The method for preparing the multiphase ceramic slurry according to claim 1, characterized in that, The method for preparing the powder slurry is as follows: anhydrous ethanol, castor oil derivative dispersant and alkylphenol polyoxyethylene ether are added to a mixer and stirred at 60-100 rpm for 20-30 min. Then, preparative materials are added and stirred at 160-200 rpm for 40-60 min. The resulting product and zirconia ball milling balls are added to a planetary ball mill at a ball-to-material ratio of 3:1 and ball milled at 300-400 rpm for 2-3 h to obtain the powder slurry.

8. The method for preparing the multiphase ceramic slurry according to claim 7, characterized in that, The mass ratio of anhydrous ethanol, castor oil derivative dispersant and alkylphenol polyoxyethylene ether is 180-190:18-22:1, and the mass of anhydrous ethanol is 10-12% of the mass of the prepared material.

9. The method for preparing the multiphase ceramic slurry according to claim 1, characterized in that, The post-processing method is as follows: the pre-solution is added to the powder slurry, and ball milling is continued. The resulting product is transferred to a vacuum mixer and stirred and defoamed for 20 to 30 minutes under the conditions of -0.095 MPa and 200 to 300 rpm. After the post-processing, the multiphase ceramic slurry is obtained.

10. The method for preparing the multiphase ceramic slurry according to claim 9, characterized in that, The ball milling process is set to 300-400 rpm for 2-3 hours, followed by ball milling at 50-100 rpm for 1-2 hours.

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