Dispersing agent composition, ceramic slurry containing dispersing agent composition, preparation method of dispersing agent composition and application of dispersing agent composition in preparation of ceramic substrate

Abstract

The invention discloses a dispersing agent composition, ceramic slurry containing the dispersing agent composition, a preparation method of the dispersing agent composition and application of the dispersing agent composition to preparation of a ceramic substrate, and belongs to the technical field of ceramic tape casting. The dispersant composition comprises a high-molecular copolymer dispersant, a medium-molecular-weight dispersant and a small-molecular-weight dispersant, the medium molecular weight dispersing agent is one or two of powder phosphate and polyethylene glycol; the small molecular weight dispersing agent is one or more of oleic acid, stearic acid and triglyceride. In addition, the invention also provides ceramic slurry which comprises the dispersant composition, a solvent, a plasticizer, a binder and ceramic powder. In addition, the invention also provides a preparation method of the ceramic slurry. In addition, the invention also provides an application of the ceramic slurry in preparation of a ceramic substrate. According to the ceramic slurry provided by the invention, the viscosity of the slurry can be reduced, and the solid content of the slurry is increased.

Description

Technical Field

[0001] The invention relates to the technical field of ceramic tape casting, and in particular to a dispersant composition, a ceramic slurry comprising the dispersant composition, a preparation method thereof, and application of the dispersant composition in preparing a ceramic substrate. Background Art

[0002] Aluminum nitride ceramics have excellent properties such as high thermal conductivity, low dielectric constant, linear expansion coefficient matching that of silicon, and good electrical insulation. They are widely used in microelectronics, heat exchange, optics and other fields. With the widespread development of modern microelectronic devices, aluminum nitride ceramics with high thermal conductivity as packaging materials or matrix materials have received widespread attention, and their applications in electronic power products such as module circuits, silicon-controlled rectifiers, high-power transistors, high-power integrated circuits, switching power supplies, etc. are becoming increasingly widespread. At present, tape casting is the main forming method for large-scale production of aluminum nitride ceramic substrates, which has the advantages of high production efficiency, simple process, and high performance.

[0003] The rheological properties of aluminum nitride ceramic slurry have a crucial influence on the thermal, mechanical and other properties of aluminum nitride ceramics formed by tape casting. Among them, high solid content can ensure that the aluminum nitride ceramic green body formed by tape casting has high density and excellent performance after sintering. Excellent stability can not only increase the storage time of the slurry but also prevent the aluminum nitride green body from having density gradient during tape casting. Low viscosity can ensure the uniform spreading of the slurry during tape casting and ensure the uniformity of the aluminum nitride ceramic green body. Configuring aluminum nitride ceramic slurry with high solid content and low viscosity is the key to preparing high-performance aluminum nitride ceramics by tape casting. Dispersants play an important role in regulating the aluminum nitride ceramic slurry. At present, the dispersants in common aluminum nitride ceramic slurries include commercial dispersants such as BYK111, natural dispersants such as fish oil, and dispersants such as polyvinyl pyrrolidone (PEI), phosphate esters, oleic acid, and triglycerides. Among them, the main factors affecting the dispersing properties of the dispersant include molecular weight and chemical structure. The molecular weight mainly affects the steric hindrance effect, and the chemical structure mainly affects the adsorption on the surface of the ceramic powder and the compatibility of the modified ceramic powder in the solvent. The above dispersants have been proven to be able to stably adsorb on the surface of aluminum nitride ceramic powder. However, fatty acid dispersants such as oleic acid, phosphate esters, and fish oils are difficult to provide good dispersion for aluminum nitride ceramic powders due to their small molecular weight and insufficient steric hindrance effect, and the fluidity of the slurry is difficult to ensure; commercial dispersants are usually polymer copolymer dispersants with too large a molecular weight, which can provide good steric hindrance and significantly reduce the viscosity of the slurry. However, polymer copolymers with too large a molecular weight will form a thicker coating layer on the surface of the aluminum nitride ceramic powder, resulting in an excessively large effective volume of the aluminum nitride ceramic powder after coating with the dispersant, making it difficult to increase the packing density of the particles in the solvent, and it is difficult to continue to increase the final maximum solid content of the slurry.

[0004] Therefore, how to achieve high solid content and low viscosity of ceramic slurry is a technical problem that needs to be solved in the prior art. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, provide a dispersant composition, a ceramic slurry including the dispersant composition, a preparation method thereof and an application in the preparation of a ceramic substrate, and solve the technical problem of how to achieve high solid content and low viscosity of the ceramic slurry in the prior art.

[0006] In order to achieve the above technical purpose, the technical solution of the present invention provides a dispersant composition, including a polymer copolymer dispersant, a medium molecular weight dispersant and a low molecular weight dispersant; the polymer copolymer dispersant is one or more of BYK111, BYK163, BYK180, Sago9090 and Sago9078; the medium molecular weight dispersant is one or two of powder phosphate and polyethylene glycol; the low molecular weight dispersant is one or more of oleic acid, stearic acid and triglyceride.

[0007] In any embodiment, the mass ratio of the high molecular weight copolymer dispersant, the medium molecular weight dispersant and the low molecular weight dispersant is (4-6):(2-3):(2-3).

[0008] In any embodiment, the high molecular weight copolymer dispersant is BYK111, the medium molecular weight dispersant is polyethylene glycol 200, and the low molecular weight dispersant is oleic acid; the mass ratio of BYK111, polyethylene glycol 200 and oleic acid is 4:3:3.

[0009] In any embodiment, the polymer copolymer dispersant is Sago9080, the medium molecular weight dispersant is phosphate ester, and the low molecular weight dispersant is stearic acid; the mass ratio of Sago9080, the phosphate ester and the stearic acid is 3:1:1; and / or, the polymer copolymer dispersant is BYK163, the medium molecular weight dispersant is polyethylene glycol 300, and the low molecular weight dispersant is triglyceride, and the mass ratio of BYK163, the polyethylene glycol 300 and the triglyceride is 5:3:2.

[0010] In addition, the present invention also provides a ceramic slurry, comprising the above-mentioned dispersant composition, a solvent, a plasticizer, a binder and ceramic powder.

[0011] In any embodiment, the mass ratio of the solvent, the dispersant composition, the plasticizer and the binder is (25-30):(3-6):(14-16):(9-12).

[0012] In any embodiment, the solid content of the ceramic powder in the ceramic slurry is 35%-65%.

[0013] In any embodiment, the solvent is ethanol; and / or the plasticizer is one or both of polypropylene glycol 400 and dibutyl phthalate; and / or the binder is polyvinyl butyral; and / or the ceramic is aluminum nitride ceramic.

[0014] In addition, the present invention also provides a method for preparing the ceramic slurry, comprising the following steps:

[0015] S1, dissolving the plasticizer, binder and dispersant composition in a solvent to prepare a premixed solution; and adding each dispersant of the dispersant composition separately;

[0016] S2, adding aluminum nitride ceramic powder to the premixed liquid, and then ball-milling to obtain ceramic slurry.

[0017] In addition, the present invention also proposes a ceramic slurry prepared by the above preparation method or an application of the above ceramic slurry in preparing a ceramic substrate.

[0018] Compared with the prior art, the beneficial effects of the present invention include: the dispersant composition proposed in the present invention includes a polymer copolymer dispersant, a medium molecular weight dispersant and a low molecular weight dispersant; the polymer copolymer dispersant is one or more of BYK111, BYK163, BYK180, Sago9090 and Sago9078; the medium molecular weight dispersant is one or two of powder phosphate and polyethylene glycol; the low molecular weight dispersant is one or more of oleic acid, stearic acid and triglyceride, and the dispersant composition includes high molecular weight, medium molecular weight and low molecular weight dispersants, while ensuring that sufficient steric hindrance is provided on the surface of the powder, the thickness of the polymer layer on the surface of the powder is minimized, the viscosity of the slurry can be reduced, and the solid content of the slurry can be increased, laying a foundation for preparing high-quality aluminum nitride substrates. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 These are the viscosity and solid content results of the ceramic slurries of Example 1, Comparative Example 1 and Comparative Example 2 of the present invention.

[0020] Figure 2 This is a SEM image of the ceramic slurry after sintering in Example 1 of the present invention.

[0021] Figure 3 It is a graph showing the thermal and mechanical properties of ceramics obtained after sintering the ceramic slurries of Examples 1-3 of the present invention and Comparative Examples 1-2. DETAILED DESCRIPTION

[0022] The "range" disclosed in the present application is defined in the form of a lower limit and an upper limit, and a given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of the particular range. The range defined in this way can be inclusive or exclusive of the end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a range. For example, if a range of 60 to 120 and 80 to 110 is listed for a particular parameter, it is understood that a range of 60 to 110 and 80 to 120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following ranges can all be expected: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4 and 2 to 5. In the present application, unless otherwise specified, the numerical range "a to b" represents an abbreviation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0023] If there is no special explanation, the "include" and "comprising" mentioned in this application are open-ended or closed-ended. For example, the "include" and "comprising" may mean that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0024] If not specifically stated, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0025] This specific embodiment provides a dispersant composition, including a polymer copolymer dispersant, a medium molecular weight dispersant and a small molecular weight dispersant; the polymer copolymer dispersant is one or more of BYK111, BYK163, BYK180, Sago9090 and Sago9078; the medium molecular weight dispersant is one or two of powder phosphate and polyethylene glycol; the small molecular weight dispersant is one or more of oleic acid, stearic acid and triglyceride; the mass ratio of the polymer copolymer dispersant, the medium molecular weight dispersant and the small molecular weight dispersant is (4-6):(2-3):(2-3).

[0026] In some embodiments, the high molecular weight copolymer dispersant is BYK111, the medium molecular weight dispersant is polyethylene glycol 200, and the low molecular weight dispersant is oleic acid; the mass ratio of BYK111, polyethylene glycol 200 and oleic acid is 4:3:3.

[0027] In some embodiments, the high molecular weight copolymer dispersant is Sago9080, the medium molecular weight dispersant is phosphate ester, and the low molecular weight dispersant is stearic acid; the mass ratio of Sago9080, the phosphate ester and the stearic acid is 3:1:1.

[0028] In some embodiments, the high molecular weight copolymer dispersant is BYK163, the medium molecular weight dispersant is polyethylene glycol 300, the low molecular weight dispersant is triglyceride, and the mass ratio of BYK163, polyethylene glycol 300 and triglyceride is 5:3:2.

[0029] This specific embodiment also proposes a ceramic slurry, comprising the above-mentioned dispersant composition, solvent, plasticizer, binder and ceramic powder; the mass ratio of the solvent, the dispersant composition, the plasticizer and the binder is (25-30):(3-6):(14-16):(9-12); the solid content of the ceramic powder in the ceramic slurry is 35%-65%; the solvent is ethanol; the plasticizer is dibutyl phthalate; the binder is polyvinyl butyral; and the ceramic is aluminum nitride ceramic.

[0030] In addition, this specific embodiment also proposes a method for preparing the above ceramic slurry, comprising the following steps:

[0031] S1, dissolving the plasticizer, binder and dispersant composition in a solvent to prepare a premixed liquid;

[0032] S2. Add aluminum nitride ceramic powder to the premixed liquid, and then ball-mill to obtain ceramic slurry; the ball-to-material mass ratio is 2:(1-1.5), the ball-milling speed is 400-800 rpm, and the ball-milling time is 12-18 h.

[0033] In addition, this specific embodiment also proposes a ceramic slurry prepared by the above preparation method or an application of the above ceramic slurry in preparing a ceramic substrate.

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] In the present invention, reference is made to “some embodiments”, “this embodiment”, examples, etc., which describe a subset of all possible embodiments, but it can be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0036] If similar descriptions of "first / second" appear in the application documents, the following instructions are added. In the following description, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.

[0037] In this embodiment, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, object A and / or object B may represent three situations: object A exists alone, object A and object B exist at the same time, and object B exists alone.

[0038] Hereinafter, the embodiments of the present application will be described. The embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. If no specific techniques or conditions are indicated in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be obtained commercially.

[0039] The ceramic powders in the following examples or comparative examples have all been dried, ground and sieved.

[0040] Example 1

[0041] This embodiment provides a dispersant composition, including a high molecular weight copolymer dispersant BYK111, a medium molecular weight dispersant polyethylene glycol 200 and a low molecular weight dispersant oleic acid; the mass ratio of the BYK111, the polyethylene glycol 200 and the oleic acid is 4:3:3.

[0042] This embodiment also proposes a ceramic slurry, including the above-mentioned dispersant composition, solvent ethanol, plasticizer dibutyl phthalate, binder polyvinyl butyral ester and ceramic powder aluminum nitride ceramic; the mass ratio of the solvent, the dispersant composition, the plasticizer and the binder is 25:3:15:12; the solid content of the ceramic powder in the ceramic slurry is 35%-65%.

[0043] This embodiment also provides a method for preparing the ceramic slurry, comprising the following steps:

[0044] S1, dissolving the plasticizer, binder and dispersant composition in a solvent to prepare a premixed liquid;

[0045] S2. Add aluminum nitride ceramic powder to the premixed liquid, and then ball-mill to obtain ceramic slurry; the ball-to-material mass ratio is 2:1.5, the ball-milling speed is 400 rpm, and the ball-milling time is 18 h.

[0046] Example 2

[0047] This embodiment proposes a dispersant composition, including a high molecular weight copolymer dispersant Sago9080, a medium molecular weight dispersant phosphate ester and a low molecular weight dispersant stearic acid; the mass ratio of the Sago9080, the phosphate ester and the stearic acid is 3:1:1.

[0048] This embodiment also proposes a ceramic slurry, including the above-mentioned dispersant composition, solvent ethanol, plasticizer dibutyl phthalate, binder polyvinyl butyral ester and ceramic powder aluminum nitride ceramic; the mass ratio of the solvent, the dispersant composition, the plasticizer and the binder is 28:6:14:10; the solid content of the ceramic powder in the ceramic slurry is 35%-65%.

[0049] This embodiment also provides a method for preparing the ceramic slurry, comprising the following steps:

[0050] S1, dissolving the plasticizer, binder and dispersant composition in a solvent to prepare a premixed liquid;

[0051] S2. Add aluminum nitride ceramic powder to the premixed liquid, and then ball-mill to obtain ceramic slurry; the ball-to-material mass ratio is 2:1, the ball-milling speed is 800 rpm, and the ball-milling time is 12 h.

[0052] Example 3

[0053] This embodiment provides a dispersant composition, including a high molecular weight copolymer dispersant BYK163, a medium molecular weight dispersant polyethylene glycol 300 and a low molecular weight dispersant triglyceride; the mass ratio of BYK163, the polyethylene glycol 300 and the triglyceride is 5:3:2.

[0054] This embodiment also proposes a ceramic slurry, including the above-mentioned dispersant composition, solvent ethanol, plasticizer dibutyl phthalate, binder polyvinyl butyral ester and ceramic powder aluminum nitride ceramic; the mass ratio of the solvent, the dispersant composition, the plasticizer and the binder is 30:4:16:9; the solid content of the ceramic powder in the ceramic slurry is 35%-65%.

[0055] This embodiment also provides a method for preparing the ceramic slurry, comprising the following steps:

[0056] S1, dissolving the plasticizer, binder and dispersant composition in a solvent to prepare a premixed liquid;

[0057] S2. Add aluminum nitride ceramic powder to the premixed liquid, and then ball-mill to obtain ceramic slurry; the ball-to-material mass ratio is 2:1.2, the ball-milling speed is 600 rpm, and the ball-milling time is 15 h.

[0058] Comparative Example 1

[0059] The difference between this comparative example and Example 1 is that the dispersant only contains the polymer copolymer dispersant BYK111. Specifically, the ceramic slurry includes the above-mentioned polymer copolymer dispersant BYK111, solvent ethanol, plasticizer polypropylene glycol 400, binder polyvinyl butyral ester and ceramic powder aluminum nitride ceramic; the mass ratio of the solvent, the polymer copolymer dispersant BYK111, the plasticizer and the binder is 25:3:15:12; the solid content of the ceramic powder in the ceramic slurry is 35%-65%.

[0060] The preparation method of the ceramic slurry is the same as that of Example 1.

[0061] Comparative Example 2

[0062] The difference between this comparative example and Example 1 is that the dispersant only contains the small molecular weight dispersant oleic acid. Specifically, the ceramic slurry includes the above-mentioned small molecular weight dispersant oleic acid, solvent ethanol, plasticizer polypropylene glycol 400, binder polyvinyl butyral ester and ceramic powder aluminum nitride ceramic; the mass ratio of the solvent, the small molecular weight dispersant oleic acid, the plasticizer and the binder is 25:3:15:12; the solid content of the ceramic powder in the ceramic slurry is 35%-65%.

[0063] The preparation method of the ceramic slurry is the same as that of Example 1.

[0064] According to the method of Example 1 (i.e., experimental group 1), Comparative Example 1 (i.e., control group 1) and Comparative Example 2 (i.e., control group 2), aluminum nitride ceramic powders with solid contents of 35%, 40%, 45%, 50%, 55%, 60% and 65% were added. The results are as follows: Figure 1As shown, when the solid content of the ceramic powder is 35%, the viscosity of the ceramic slurry of Example 1 is as low as 0.1 Pa·S, and the viscosity of the ceramic slurry of Comparative Example 2 is as high as 0.5 Pa·S or more. With the increase of solid content, the viscosity of the ceramic slurry gradually increases. When the solid content of the ceramic powder reaches 50%, the viscosity of the ceramic slurries of Comparative Example 1 and Comparative Example 2 is significantly higher than that of Example 1, especially the viscosity of the ceramic slurry of Comparative Example 2 is as high as 2.2 Pa·S or more. When the solid content of the ceramic powder of Comparative Example 1 is 60%, its viscosity is as high as 3.2 Pa·S or more, while when the solid content of the ceramic powder of Example 1 is 65%, the viscosity is only 2 Pa·S. It can be seen that the dispersant composition proposed in the present application can reduce the viscosity of the slurry while increasing the solid content of the slurry, laying a foundation for the preparation of high-quality aluminum nitride substrates.

[0065] Sintering experiment

[0066] The ceramic slurry with a solid content of 65% in Example 1 was tape-casted by a tape-casting machine to obtain an aluminum nitride ceramic green body. The tape-casting temperature was 75° C., the tape speed was 45 mm / s, the tape thickness was 200 μm, and a single-layer aluminum nitride thin layer was obtained.

[0067] The aluminum nitride ceramic green body is degreased and sintered in sequence to obtain aluminum nitride ceramic, the degreasing rate is 0.5°C / min, the holding temperatures are 280, 350, 450, 550°C, the holding time is 100min, the sintering temperature is 1700°C, and the sintering time is 110min.

[0068] In addition, combined Figure 2 It can be seen that after sintering, the aluminum nitride ceramic has a uniform microstructure, excellent thermal and mechanical properties, and can be used as a ceramic substrate.

[0069] According to the above sintering experiment, the ceramic slurries with a solid content of 65% of Example 2, Example 3, Comparative Example 1 and Comparative Example 2 were sintered, and then the thermal and mechanical properties were tested. The results are as follows: Figure 3 As shown, from Figure 3 It can be seen that the flexural strength of the ceramics obtained in Comparative Examples 1 and 2 is relatively low, less than 220 MPa, and the thermal conductivity is also relatively low, less than 160 W / (mk); the flexural strength of the ceramics obtained in Examples 1-3 is as high as over 320 MPa, and the highest is over 350 MPa; the thermal conductivity of the ceramics obtained in Examples 1-3 is as high as over 230 W / (mk), which is significantly better than Comparative Examples 1 and 2.

[0070] It should be noted that Examples 2 and 3 have low viscosity and high solid content comparable to Example 1, as well as excellent thermal and mechanical properties.

[0071] The present invention aims at the technical requirements that aluminum nitride ceramic slurry for tape casting is difficult to meet at the same time of ultra-high solid content and ultra-low viscosity, and proposes a method for preparing multi-dispersant aluminum nitride ceramic slurry for tape casting. By selecting a dispersant with good compatibility of chemical structure with solvent, binder and plasticizer molecular structure, and then selecting high molecular weight, medium molecular weight and low molecular weight dispersants, compounding them according to a certain proportion, while ensuring that sufficient steric hindrance is provided on the surface of the powder, the thickness of the polymer layer on the surface of the powder is minimized, the viscosity of the slurry can be reduced, and the solid content of the slurry can be increased, which lays the foundation for preparing high-quality aluminum nitride substrates.

[0072] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A dispersant composition, characterized in that It includes a polymer copolymer dispersant, a medium molecular weight dispersant and a small molecular weight dispersant; the polymer copolymer dispersant is one or more of BYK111, BYK163, BYK180, Sago9090 and Sago9078; the medium molecular weight dispersant is one or two of powder phosphate and polyethylene glycol; the small molecular weight dispersant is one or more of oleic acid, stearic acid and triglyceride.

2. The dispersant composition according to claim 1, characterized in that The mass ratio of the high molecular weight copolymer dispersant, the medium molecular weight dispersant and the small molecular weight dispersant is (4-6):(2-3):(2-3).

3. The dispersant composition according to claim 2, characterized in that The high molecular weight copolymer dispersant is BYK111, the medium molecular weight dispersant is polyethylene glycol 200, and the low molecular weight dispersant is oleic acid; the mass ratio of BYK111, polyethylene glycol 200 and oleic acid is 4:3:

3.

4. The dispersant composition according to claim 2, characterized in that The polymer copolymer dispersant is Sago9080, the medium molecular weight dispersant is phosphate ester, and the small molecular weight dispersant is stearic acid; the mass ratio of Sago9080, the phosphate ester and the stearic acid is 3:1:1; and / or, the polymer copolymer dispersant is BYK163, the medium molecular weight dispersant is polyethylene glycol 300, and the small molecular weight dispersant is triglyceride, and the mass ratio of BYK163, the polyethylene glycol 300 and the triglyceride is 5:3:

2.

5. A ceramic slurry, characterized in that: The invention comprises the dispersant composition according to any one of claims 1 to 4, a solvent, a plasticizer, a binder and ceramic powder.

6. The ceramic slurry according to claim 5, characterized in that The mass ratio of the solvent, the dispersant composition, the plasticizer and the binder is (25-30):(3-6):(14-16):(9-12).

7. The ceramic slurry according to claim 5, characterized in that The solid content of the ceramic powder in the ceramic slurry is 35%-65%.

8. The ceramic slurry according to claim 5, characterized in that: The solvent is ethanol; and / or the plasticizer is dibutyl phthalate; and / or the binder is polyvinyl butyral; and / or the ceramic is aluminum nitride ceramic.

9. A method for preparing the ceramic slurry according to any one of claims 5 to 8, characterized in that: The following steps are involved: S1, dissolving the plasticizer, binder and dispersant composition in a solvent to prepare a premixed liquid; S2, adding aluminum nitride ceramic powder to the premixed liquid, and then ball-milling to obtain ceramic slurry.

10. Use of the ceramic slurry prepared by the preparation method according to any one of claims 5 to 8 or the ceramic slurry according to claim 9 in preparing a ceramic substrate.

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