Casting slurry as well as preparation method and application thereof

Abstract

The invention discloses tape casting slurry as well as a preparation method and application thereof, and belongs to the technical field of ceramic tape casting. The tape casting slurry is obtained by mixing and ball-milling ceramic slurry and ceramic powder, the ceramic slurry comprises a binder, a dispersant, a plasticizer and a solvent; the binder comprises at least two kinds of polyvinyl butyral with different molecular weights. In addition, the invention also provides a preparation method of the tape-casting slurry, which comprises the following steps: mixing polyvinyl butyral with different molecular weights into a binder; adding the dispersing agent, the plasticizer and the binder into the solvent, and stirring to obtain a premixed solution; adding ceramic powder into the premixed liquid, and stirring to obtain ceramic slurry; and carrying out ball milling on the obtained ceramic slurry to obtain the tape casting slurry. In addition, the invention also provides application of the tape casting slurry or the tape casting slurry prepared by the preparation method in preparation of ceramic green bodies. The ceramic slurry is high in solid content and low in viscosity.

Description

Technical Field

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

[0002] Ceramic substrates are currently widely used in semiconductors, vehicles and other fields due to their excellent thermodynamic and electrical properties. To be precise, in the field of microelectronics, substrates have the functions of fixing chips, achieving electrical connections, and dissipating heat.

[0003] The mainstream ceramic substrates at present include alumina substrates, aluminum nitride substrates, etc. The performance requirements for this type of substrate are mainly reflected in: thermal properties: including thermal conductivity, thermal expansion coefficient and temperature uniformity, mechanical properties: flexural strength, etc., electrical properties: resistance, etc.

[0004] In order to obtain a ceramic substrate with excellent performance, high density and few defects are essential. In addition to improving the sintering and degreasing processes to improve density, the higher the solid content of the ceramic slurry, the higher the density of the final product. However, high solid content means high viscosity of the slurry, which is difficult to cast. Based on this, how to increase the solid content while reducing the viscosity is a technical problem that the existing technology needs to solve. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies, provide a tape casting slurry and a preparation method and application thereof, and solve the technical problem of how to increase the solid content of ceramic slurry while reducing the viscosity in the prior art.

[0006] In order to achieve the above technical objectives, the technical solution of the present invention provides a casting slurry, which is obtained by mixing and ball-milling a ceramic slurry and a ceramic powder; the ceramic slurry includes a binder, a dispersant, a plasticizer and a solvent; the mass ratio of the dispersant, the plasticizer, the binder and the solvent is 1:(2-10):(5-20):(40-70); the binder includes at least two polyvinyl butyrals (i.e., PVB) of different molecular weights.

[0007] In any embodiment, the average molecular weight of the polyvinyl butyrals of different molecular weights is 15,000-250,000.

[0008] In any embodiment, the binder includes polyvinyl butyral with average molecular weights of 15000-3000, 25000-75000 and 100000-150000, respectively, and the mass ratio of the three is 1:(1-2):(1-1.2); or, the binder includes polyvinyl butyral with average molecular weights of 15000-20000, 75000-80000, respectively, and the mass ratio of the two is 1:(1.5-2).

[0009] In any embodiment, the addition amount of the ceramic powder is 70%-85% of the mass of the ceramic slurry; and / or the dispersant is one or more of oleic acid, fish oil, castor oil, BYK111 and triolein; and / or the plasticizer is one or more of phthalate, PEG 200, PEG 400 and PEG 600; and / or the solvent is one or more of ethanol, toluene, xylene, and butanone.

[0010] In any embodiment, the phthalate is one or both of dibutyl phthalate DBP and dioctyl phthalate DOP.

[0011] In addition, the present invention also provides a method for preparing the above-mentioned casting slurry, comprising the following steps:

[0012] Polyvinyl butyrals of different molecular weights are mixed as a binder;

[0013] Adding a dispersant, a plasticizer and a binder into a solvent and stirring to obtain a premixed liquid;

[0014] Adding ceramic powder to the premixed liquid and stirring to obtain ceramic slurry;

[0015] The obtained ceramic slurry is ball-milled to obtain a casting slurry.

[0016] In any embodiment, the rotation speed of the ball mill is 300-600 rpm, and the time of the ball mill is 6-24 h.

[0017] In any embodiment, the ceramic powder is added to the premixed liquid and stirred at a temperature of 20-50° C. and a stirring speed of 10-50 rpm.

[0018] In addition, the present invention also proposes the use of the above-mentioned casting slurry or the casting slurry prepared by the above-mentioned preparation method in the preparation of ceramic green bodies.

[0019] In any embodiment, the above application includes: casting the casting slurry to obtain a ceramic green body, setting the blade height to 0.1-0.5 mm, the base belt speed to 0.01-0.3 m / s, the drying tunnel length to 4-16 m, and setting the temperature at every 2-3 m interval to 20° C.-90° C. according to a gradient from low to high to obtain the ceramic green body.

[0020] Compared with the prior art, the beneficial effects of the present invention include: the tape casting slurry proposed by the present invention is obtained by mixing ceramic slurry and ceramic powder; the ceramic slurry includes a binder, a dispersant, a plasticizer and a solvent; the mass ratio of the dispersant, the plasticizer, the binder and the solvent is 1:(2-10):(5-20):(40-70); the binder includes at least two polyvinyl butyrals with different molecular weights. The reason why PVB with different molecular weights can accommodate more powders is that, compared with PVB with a single molecular weight as a binder, low molecular weight PVB can effectively reduce the viscosity, while high molecular weight PVB can be used as a matrix to carry powder. The two cooperate with each other and can maintain a relatively low viscosity while accommodating more powders. In combination with other components, a ceramic slurry with high solid content and low viscosity can be obtained, with a solid content of up to 70%-85%. The ceramic green body obtained by tape casting with this slurry is evenly dispersed, and the ceramic sheet obtained by sintering has a high density. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 These are photos of the tape-casting slurry (left picture) prepared in Example 1 of the present invention and the ceramic green body after tape-casting (right picture).

[0022] Figure 2 These are photos of the tape-cast ceramic slurry (left picture) prepared in Comparative Example 1 of the present invention and the ceramic green body after tape-casting (right picture).

[0023] Figure 3 These are photos of the tape-cast ceramic slurry (left picture) prepared in Comparative Example 2 of the present invention and the ceramic green body after tape-casting (right picture). DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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).

[0027] The present specific embodiment provides a tape casting slurry, which is obtained by mixing and ball milling ceramic slurry and ceramic powder; the ceramic slurry includes a binder, a dispersant, a plasticizer and a solvent; the mass ratio of the dispersant, the plasticizer, the binder and the solvent is 1: (2-10): (5-20): (40-70); the binder includes at least two polyvinyl butyrals with different molecular weights; the average molecular weight of the polyvinyl butyrals with different molecular weights is 15000-250000; the addition amount of the ceramic powder is 70%-85% of the mass of the ceramic slurry; the dispersant is one or more of oleic acid, fish oil, castor oil, BYK111 and triolein; the plasticizer is phthalate, PEG 200, PEG 400 and PEG 600; the phthalate is one or both of dibutyl phthalate DBP and dioctyl phthalate DOP; the solvent is one or more of ethanol, toluene, xylene, and butanone.

[0028] In some embodiments, the binder includes polyvinyl butyral with average molecular weights of 15000-3000, 25000-75000 and 100000-150000, respectively, and the mass ratio of the three is 1:(1-2):(1-1.2); or, the binder includes polyvinyl butyral with average molecular weights of 15000-20000 and 75000-80000, respectively, and the mass ratio of the two is 1:(1.5-2).

[0029] This specific embodiment also proposes a method for preparing the above-mentioned casting slurry, comprising the following steps:

[0030] Polyvinyl butyrals of different molecular weights are mixed as a binder;

[0031] Add the dispersant, plasticizer and binder into the solvent and stir to obtain a premixed liquid; the stirring temperature is 20-50°C and the stirring speed is 10-50rpm;

[0032] Adding ceramic powder to the premixed liquid and stirring to obtain ceramic slurry;

[0033] The ceramic slurry is ball-milled to obtain a tape-casting slurry; the rotation speed of the ball mill is 300-600 rpm, and the ball milling time is 6-24 hours.

[0034] This specific embodiment also proposes an application of the above-mentioned casting slurry or the casting slurry obtained by the above-mentioned preparation method in the preparation of ceramic green bodies, including: casting the casting slurry to obtain a ceramic green body, setting the blade height to 0.1-0.5mm, the base belt speed to 0.01-0.3m / s, the drying tunnel length to 4-16m, and setting the temperature at every 2-3m interval to 20℃-90℃ according to a gradient from low to high to obtain the ceramic green body.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Example 1

[0041] This embodiment provides a casting slurry, which is prepared by the following preparation method:

[0042] 1) drying, grinding and sieving aluminum nitride ceramic powder;

[0043] 2) adding a dispersant triolein, a plasticizer PEG 200, and a binder to a solvent and stirring to obtain a premixed solution; the binder is PVB with average molecular weights of 15000, 25000, and 100000, respectively, and is mixed uniformly at a mass ratio of 1:1:1; the solvent is ethanol; the mass ratio of the dispersant, the binder, the plasticizer, and the solvent is 1:3:10:50;

[0044] 3) adding ceramic powder to the premixed liquid and stirring to obtain ceramic slurry; the stirring temperature is 20° C. and the stirring speed is 30 rpm; the amount of the ceramic powder added is 75% of the mass of the ceramic slurry;

[0045] 4) The obtained ceramic slurry is transferred to a planetary ball mill for ball milling to obtain a ceramic slurry for tape casting (i.e., tape casting slurry); the rotation speed of the ball mill is 400 rpm, and the ball milling time is 12 h.

[0046] This embodiment further proposes that the above-mentioned casting slurry is used to prepare a ceramic green body; casting the casting slurry to obtain the ceramic green body comprises:

[0047] 5) Casting the ceramic slurry for tape casting to obtain a ceramic green body; Casting the ceramic slurry for tape casting to obtain the ceramic green body comprises:

[0048] The ceramic slurry for tape casting was transferred to the tape casting machine, and the knife head height was set to 0.3 mm, the base belt speed to 0.1 m / s, the drying tunnel length to 9 m, and the temperature was set to 25°C, 35°C, and 50°C at every 3 m interval according to a gradient from low to high to obtain a ceramic green body with no cracks on the surface.

[0049] Example 2

[0050] This embodiment provides a casting slurry, which is prepared by the following preparation method:

[0051] 1) drying, grinding and sieving alumina ceramic powder;

[0052] 2) adding a dispersant BYK1111, a plasticizer PEG 400 and a binder into a solvent and stirring to obtain a premixed solution; the binder is PVB with average molecular weights of 15000 and 75000 respectively, which are mixed uniformly in a mass ratio of 1:2; the solvent is toluene; the mass ratio of the dispersant, the binder, the plasticizer and the solvent is 1:4:12:58;

[0053] 3) adding ceramic powder to the premixed liquid and stirring to obtain ceramic slurry; the stirring temperature is 20° C. and the stirring speed is 40 rpm; the amount of the ceramic powder added is 70% of the mass of the ceramic slurry;

[0054] 4) The obtained ceramic slurry was transferred to a planetary ball mill for ball milling to obtain ceramic slurry for tape casting; the rotation speed of the ball mill was 450 rpm, and the ball milling time was 10 h.

[0055] This embodiment also proposes to use the above-mentioned casting slurry to prepare a ceramic green body; casting the casting ceramic slurry to obtain the ceramic green body comprises:

[0056] 5) The ceramic slurry is transferred to a tape casting machine, and the knife head height is set to 0.2 mm, the base belt speed is set to 0.01 m / s, the drying tunnel length is set to 8 m, and the temperature is set to 20°C, 30°C, 40°C, and 50°C at every 2 m interval according to a gradient from low to high to obtain a ceramic green body with no cracks on the surface.

[0057] Example 3

[0058] This embodiment provides a ceramic green body, which is prepared by the following steps:

[0059] 1) drying, grinding and sieving silicon nitride ceramic powder;

[0060] 2) adding a dispersant castor oil, a plasticizer PEG 600, and a binder to a solvent and stirring to obtain a premixed solution; the binder is PVB with average molecular weights of 30,000, 75,000, and 150,000, respectively, and is mixed uniformly in a mass ratio of 1:2:1; the solvent is xylene; the mass ratio of the dispersant, the binder, the plasticizer, and the solvent is 1:3:12:65;

[0061] 3) adding ceramic powder to the premixed liquid and stirring to obtain ceramic slurry; the stirring temperature is 30° C. and the stirring speed is 30 rpm; the amount of the ceramic powder added is 85% of the mass of the ceramic slurry;

[0062] 4) transferring the obtained ceramic slurry to a planetary ball mill for ball milling to obtain ceramic slurry for tape casting; the rotation speed of the ball mill is 500 rpm, and the ball milling time is 24 hours;

[0063] 5) Casting the ceramic slurry for tape casting to obtain a ceramic green body; Casting the ceramic slurry for tape casting to obtain the ceramic green body comprises:

[0064] The ceramic slurry was transferred to the casting machine, and the knife head height was set to 0.5 mm, the base belt speed to 0.1 m / s, the drying tunnel length to 12 m, and the temperature was set to 25°C, 30°C, 35°C, 45°C, 50°C, and 55°C at every 2 m interval according to a gradient from low to high to obtain a ceramic green body with no cracks on the surface.

[0065] Example 4

[0066] This embodiment provides a ceramic green body, which is prepared by the following steps:

[0067] 1) Drying, grinding and sieving silicon carbide ceramic powder;

[0068] 2) adding a dispersant BYK1111, a plasticizer PEG 400 and a binder into a solvent and stirring to obtain a premixed solution; the binder is PVB with average molecular weights of 15000 and 75000 respectively, which are mixed uniformly at a mass ratio of 1:2; the solvent is butanone; the mass ratio of the dispersant, the binder, the plasticizer and the solvent is 1:2.5:10:60;

[0069] 3) adding ceramic powder to the premixed liquid and stirring to obtain ceramic slurry; the stirring temperature is 40° C. and the stirring speed is 50 rpm; the amount of the ceramic powder added is 70% of the mass of the ceramic slurry;

[0070] 4) The obtained ceramic slurry was transferred to a planetary ball mill for ball milling to obtain ceramic slurry for tape casting; the rotation speed of the ball mill was 450 rpm, and the ball milling time was 18 h.

[0071] This embodiment also proposes to use the above-mentioned casting slurry to prepare a ceramic green body, including:

[0072] 5) Casting the ceramic slurry for tape casting to obtain a ceramic green body; Casting the ceramic slurry for tape casting to obtain the ceramic green body comprises:

[0073] The ceramic slurry was transferred to the casting machine, the knife head height was set to 0.4 mm, the base belt speed was 0.1 m / s, the drying tunnel length was 16 m, and the temperature was set to 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, 65°C, and 80°C at every 2 m interval according to a gradient from low to high to obtain a ceramic green body with no cracks on the surface.

[0074] Comparative Example 1

[0075] The difference between the method for preparing the casting slurry in this comparative example and that in Example 1 is that in step 2), PVB with a single average molecular weight of 15000 is used, as follows:

[0076] 1) drying, grinding and sieving aluminum nitride ceramic powder;

[0077] 2) adding a dispersant triolein, a plasticizer PEG 200, and a binder to a solvent and stirring to obtain a premixed solution; the binder is PVB with an average molecular weight of 15,000 and 15,000, respectively; the solvent is ethanol; the mass ratio of the dispersant, the binder, the plasticizer, and the solvent is 1:3:10:50;

[0078] 3) adding ceramic powder to the premixed liquid and stirring to obtain ceramic slurry; the stirring temperature is 20° C. and the stirring speed is 30 rpm; the amount of the ceramic powder added is 75% of the mass of the ceramic slurry;

[0079] 4) The obtained ceramic slurry was transferred to a planetary ball mill for ball milling to obtain ceramic slurry for tape casting; the rotation speed of the ball mill was 400 rpm, and the ball milling time was 12 h.

[0080] This comparative example also proposes to use the above-mentioned casting slurry to prepare a ceramic green body; casting the casting ceramic slurry to obtain the ceramic green body comprises:

[0081] 5) Casting the ceramic slurry for tape casting to obtain a ceramic green body; Casting the ceramic slurry to obtain the ceramic green body comprises:

[0082] The ceramic slurry for tape casting was transferred to the tape casting machine, and the knife head height was set to 0.3 mm, the base belt speed to 0.1 m / s, the drying tunnel length to 9 m, and the temperature was set to 25°C, 35°C, and 50°C at every 3 m interval according to a gradient from low to high to obtain a ceramic green body.

[0083] Comparative Example 2

[0084] The difference between the method for preparing the casting slurry in this comparative example and that in Example 1 is that PVB with an average molecular weight of 100,000 is used in step 2), as follows:

[0085] 1) drying, grinding and sieving aluminum nitride ceramic powder;

[0086] 2) adding a dispersant triolein, a plasticizer PEG 200, and a binder to a solvent and stirring to obtain a premixed solution; the binder is PVB with an average molecular weight of 100,000; the solvent is ethanol; the mass ratio of the dispersant, the binder, the plasticizer and the solvent is 1:3:10:50;

[0087] 3) adding ceramic powder to the premixed liquid and stirring to obtain ceramic slurry; the stirring temperature is 20° C. and the stirring speed is 30 rpm; the amount of the ceramic powder added is 75% of the mass of the ceramic slurry;

[0088] 4) The obtained ceramic slurry was transferred to a planetary ball mill for ball milling to obtain ceramic slurry for tape casting; the rotation speed of the ball mill was 400 rpm, and the ball milling time was 12 h.

[0089] This comparative example also proposes to use the above-mentioned casting slurry to prepare a ceramic green body; casting the casting ceramic slurry to obtain the ceramic green body comprises:

[0090] 5) The ceramic slurry for tape casting in step 4) is transferred to a tape casting machine, and the blade height is set to 0.3 mm, the base belt speed is set to 0.1 m / s, the drying tunnel length is set to 9 m, and the temperature is set to 25°C, 35°C, and 50°C at every 3 m interval according to a gradient from low to high to obtain a ceramic green body.

[0091] Combination Figure 1 , Figure 2 and Figure 3 It can be seen that the ceramic slurry prepared in Comparative Example 1 has agglomerated particles and cannot be mixed evenly, and the prepared ceramic green body is difficult to form. The viscosity of the ceramic slurry prepared in Comparative Example 2 is obviously too high, and there are a large number of defects on the surface of the ceramic green body. The ceramic slurry prepared in Example 1 has good fluidity and low viscosity, and the surface of the ceramic green body is smooth without obvious defects.

[0092] It should be noted that the ceramic green bodies prepared in Examples 2-4 are substantially the same as the ceramic green bodies prepared in Example 1 in appearance.

[0093] 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 tape casting slurry, characterized in that: The ceramic slurry and ceramic powder are mixed and ball-milled to obtain the ceramic slurry; the ceramic slurry includes a binder, a dispersant, a plasticizer and a solvent; the mass ratio of the dispersant, the plasticizer, the binder and the solvent is 1:(2-10):(5-20):(40-70); the binder includes at least two polyvinyl butyrals of different molecular weights.

2. The tape casting slurry according to claim 1, characterized in that: The average molecular weight of the polyvinyl butyral with different molecular weights is 15000-250000.

3. The tape casting slurry according to claim 2, characterized in that: The binder includes polyvinyl butyral with average molecular weights of 15000-3000, 25000-75000 and 100000-150000, respectively, and the mass ratio of the three is 1:(1-2):(1-1.2); or, the binder includes polyvinyl butyral with average molecular weights of 15000-20000 and 75000-80000, respectively, and the mass ratio of the two is 1:(1.5-2).

4. The tape casting slurry according to claim 1, characterized in that: The addition amount of the ceramic powder is 70%-85% of the mass of the ceramic slurry; and / or the dispersant is one or more of oleic acid, fish oil, castor oil, BYK111 and triolein; and / or the plasticizer is one or more of phthalate, PEG 200, PEG 400 and PEG 600; and / or the solvent is one or more of ethanol, toluene, xylene and butanone.

5. The tape casting slurry according to claim 4, characterized in that: The phthalate is one or both of dibutyl phthalate DBP and dioctyl phthalate DOP.

6. A method for preparing the tape casting slurry according to any one of claims 1 to 5, characterized in that: The following steps are involved: Polyvinyl butyrals of different molecular weights are mixed as a binder; Adding a dispersant, a plasticizer and a binder into a solvent and stirring to obtain a premixed liquid; Adding ceramic powder to the premixed liquid and stirring to obtain ceramic slurry; The obtained ceramic slurry is ball-milled to obtain a tape-casting slurry.

7. The method for preparing the tape casting slurry according to claim 6, characterized in that: The rotation speed of the ball mill is 300-600 rpm, and the time of the ball mill is 6-24 hours.

8. The method for preparing the tape casting slurry according to claim 6, characterized in that: The ceramic powder is added to the premixed liquid and stirred at a temperature of 20-50° C. and a stirring speed of 10-50 rpm.

9. Use of the tape casting slurry according to any one of claims 1 to 5 or the tape casting slurry prepared by the preparation method according to any one of claims 6 to 8 in preparing ceramic green bodies.

10. The use according to claim 9, characterized in that: include: The casting slurry is cast to obtain a ceramic green body, the blade height is set to 0.1-0.5 mm, the base belt speed is set to 0.01-0.3 m / s, the drying tunnel length is set to 4-16 m, and the temperature is set to 20° C.-90° C. at every 2-3 m interval according to a gradient from low to high to obtain the ceramic green body.

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