Granulation method for preparing binder jet printing powder based on cold isostatic pressing process

Abstract

The invention discloses a granulation method for preparing binder jet printing powder based on a cold isostatic pressing process, and relates to the technical field of additive manufacturing. The granulation method comprises the following steps: S1, carrying out ball milling treatment on 20-60 parts by mass of ceramic powder and 0.2-6 parts by mass of an additive, uniformly mixing, drying, and sieving with a 80-120-mesh sieve to obtain mixed powder; s2, performing cold isostatic pressing treatment on the mixed powder to obtain a ceramic block; and S3, the ceramic blocks are crushed, and powder with the preset particle size range is taken, so that the binder jet printing powder is obtained. According to the invention, through a pure physical granulation path of cold isostatic pressing, granulated particles with flowability close to that of coarse powder are formed, so that the powder spreading uniformity is ensured; compared with the prior art, the method has the advantages that the compatibility conflict between granulation powder and subsequent printing glue can be thoroughly eliminated, the dual goals of'no adhesive interference 'and'fine powder sintering activity retention' of the adhesive jet printing powder are achieved, the types of powder capable of being used in the adhesive jet printing technology are effectively expanded, and therefore wide application of the technology is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of binder jet printing additive manufacturing, and particularly to a granulation method for preparing binder jet printing powder based on a cold isostatic pressing process. Background Art

[0002] Additive manufacturing (AM), commonly known as 3D printing, has revolutionized the traditional manufacturing method through the principle of discrete accumulation. Among them, the binder jet technology is widely used in fields such as precision casting, medical treatment, and electronics due to its advantages of good compatibility with various powders, large span of forming size range, and no need for printing support structures. However, the binder jet forming technology requires the powder to have good fluidity so that the powder can be smoothly laid. Therefore, coarse powder with a particle size greater than 20 μm is often selected for binder jet printing. However, the coarse powder has a small specific surface area, poor sintering activity, and is difficult to sinter densely. Although the fine powder can be agglomerated into granulated powder with good fluidity through the granulation process to balance fluidity and sintering activity, the binder introduced in the traditional granulation process is prone to compatibility conflicts with the subsequent printing glue, seriously restricting the direct application of the granulated powder in the binder jet system. Developing a new granulation method to eliminate the interference of the two-stage binder has become a key requirement to break through this technical bottleneck. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a powder for binder jet printing, which overcomes the compatibility problem between the binder in the granulated powder and the printing glue.

[0004] To solve the above problems, the present invention proposes the following technical solutions:

[0005] In a first aspect, the present invention provides a granulation method for preparing binder jet printing powder based on a cold isostatic pressing process, including the following steps:

[0006] S1. By mass, 20 - 60 parts of ceramic powder and 0 - 6.0 parts of additive are subjected to ball milling treatment, mixed evenly and then dried, and sieved through a 80 - 120 mesh sieve to obtain a mixed powder;

[0007] S2. The mixed powder is subjected to cold isostatic pressing treatment to obtain a ceramic block;

[0008] S3. The ceramic block is broken, and the powder within a preset particle size range is taken to obtain the binder jet printing powder.

[0009] A further technical solution thereof is that in the step S2, the pressure of the cold isostatic pressing treatment is 20 - 500 MPa, and the pressure holding time is 2 - 20 min.

[0010] A further technical solution is that in the step S2, the pressure of the cold isostatic pressing treatment is 100-400 MPa, and the pressure holding time is 3-10 min.

[0011] A further technical solution is that in the step S2, the pressure of the cold isostatic pressing treatment is 200-300 MPa, and the pressure holding time is 4-6 min.

[0012] It can be understood that the pressure and pressure holding time of the cold isostatic pressing treatment can be flexibly adjusted according to different ceramic systems to balance the particle densification and redispersibility, ensuring that the granulated powder has sufficient mechanical strength to resist breakage during the powder spreading process and can accurately control the target particle size distribution through subsequent crushing and screening.

[0013] A further technical solution is that in the step S2, it also includes placing the mixed powder obtained in the step S1 in a vacuum bag for vacuum treatment and then performing cold isostatic pressing treatment.

[0014] A further technical solution is that the preset particle size range in the step S3 is 50-400 mesh, such as 50 mesh, 80 mesh, 100 mesh, 150 mesh, 200 mesh, 250 mesh, 300 mesh, 350 mesh, 400 mesh.

[0015] A further technical solution is that the particle size of the ceramic powder is 0.02-20 μm, such as 0.02 μm, 0.05 μm, 0.10 μm, 0.18 μm, 0.25 μm, 0.50 μm, 0.80 μm, 1.50 μm, 3.5 μm, 5.0 μm, 10.0 μm, 13.50 μm, 15.50 μm, 18.0 μm, 20.0 μm.

[0016] A further technical solution is that the ceramic powder is selected from at least one of oxide ceramic powder, nitride ceramic powder, carbide ceramic powder, and high-entropy ceramic powder.

[0017] A further technical solution is that the additive is selected from at least one of graphene, Re x E y where Re is Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb or Lu, and E is O, F or H.

[0018] A further technical solution is that the addition amount of the additive is 0-6.0 parts, for example, 0 parts, 0.2 parts, 0.5 parts, 2.0 parts, 4.0 parts, 5.5 parts, 6.0 parts.

[0019] A further technical solution is that in the step S1, the rotation speed of the ball milling treatment is 100-800 r / min, and the time is 1-15 h.

[0020] A further technical solution thereof is that the specific operation of step S1 is as follows: by mass, take each component: 40-80 parts of a dispersion medium, 20-60 parts of ceramic powder, 40-80 parts of grinding balls, and 0-6.0 parts of an additive; add the above components into a ball mill tank for ball milling to obtain a ceramic slurry, and then dry and screen the ceramic slurry to obtain a mixed powder. The dispersion medium is selected from at least one of water and alcohol.

[0021] In a second aspect, the present invention also provides a powder for binder jet printing, which is obtained by the granulation method for preparing a powder for binder jet printing based on the cold isostatic pressing process described in the first aspect.

[0022] In a third aspect, the present invention also provides a method for preparing a ceramic body by binder jet printing, which is prepared using the powder for binder jet printing described in the second aspect, or using the powder obtained by the granulation method for preparing a powder for binder jet printing based on the cold isostatic pressing process described in the first aspect.

[0023] Compared with the prior art, the technical effects that the present invention can achieve include:

[0024] The granulation method for preparing a powder for binder jet printing based on the cold isostatic pressing process provided by the present invention realizes the dual goals of "no binder interference" and "retaining the sintering activity of fine powder" for the powder for binder jet printing through the pure physical granulation path of cold isostatic pressing, providing a new powder preparation method with high fluidity, high sintering activity and wide compatibility for binder jet printing.

[0025] The present invention physically compacts fine powder by cold isostatic pressing to form granulated particles with fluidity close to that of coarse powder, ensuring uniform powder spreading; no binder or other molten substances in the traditional granulation process are introduced, which can completely eliminate the compatibility conflict between the granulated powder and the subsequent printing glue, enabling the granulated powder to be directly adapted to the binder jet system, and completely retaining the high sintering activity of the fine powder. The density and mechanical properties of the final sintered part are significantly better than those of traditional coarse powder.

[0026] The granulation method of the present invention avoids the interference of binder residue on the powder properties, and the process flow is simple. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for description in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1Scanning electron microscope (SEM) microstructural diagram of the alumina granulated powder prepared in Example 1.

[0029] Figure 2 Particle size distribution diagram of the alumina granulated powder prepared in Example 1. Detailed implementation manners

[0030] The following will clearly and completely describe the technical solutions in the embodiments with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments to be described below are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0032] It should also be understood that the terms used in the specification of the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. As used in the specification of the embodiments of the present invention and the appended claims, unless otherwise clearly specified in the context, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0033] Taking the ceramic powder without additives as an example, the granulation method for preparing the binder jet printing powder based on the cold isostatic pressing process provided by the present invention will be described.

[0034] Example 1

[0035] After measurement, 500 g of Al2O3 ceramic powder with a particle size of 200 nm, without granulation treatment, has a loose bulk density of 0.813 g / cm 3 .

[0036] S1. Take 500 g of Al2O3 ceramic powder with a particle size of 200 nm, 500 g of deionized water, and 500 g of grinding balls and add them into a ball mill jar. Ball mill for 3 h at a rotation speed of 300 rpm to obtain a ceramic slurry. Then, dry the ceramic slurry and pass it through a 100-mesh sieve to obtain a mixed powder.

[0037] S2. Place the mixed powder into a vacuum bag for vacuuming, and then place it in a cold isostatic press for cold isostatic pressing. The parameters of the cold isostatic pressing are: pressure of 200 MPa and pressure holding time of 5 min to obtain a ceramic block.

[0038] S3. Crush the ceramic mass, then sieve it with a sieve mesh, and select the powder in the range of 100 - 200 mesh as the powder for binder jet printing to obtain granulated powder.

[0039] Figure 1 This is the scanning electron microscope (SEM) microstructural diagram of the alumina granulated powder prepared in this example.

[0040] Figure 2 This is the particle size distribution diagram of the alumina granulated powder prepared in this example.

[0041] The loose bulk density of the alumina granulated powder prepared in this example is 1.025 g / cm 3 , the median diameter is 2.65 μm, which is 26.07% higher than that of the alumina powder before granulation.

[0042] Carry out binder jet printing on the alumina granulated powder prepared in this example, sinter it at a temperature of 1600 °C for 120 min. After sintering, the density of the sample is 50.28%, and the flexural strength is 2.78 MPa.

[0043] Example 2

[0044] After measurement, 500 g of Si3N4 ceramic powder with a particle size of 700 nm has a loose bulk density of 0.6927 g / cm 3 .

[0045] S1. Take 500 g of Si3N4 ceramic powder with a particle size of 700 nm, 500 g of absolute ethanol, and 500 g of grinding balls and add them to the ball mill jar. Ball mill for 3 h at a rotation speed of 300 rpm to obtain a ceramic slurry. Then dry the ceramic slurry, and pass it through a 100-mesh sieve after drying to obtain a mixed powder.

[0046] S2. Place the mixed powder in a vacuum bag for vacuuming, and then place it in a cold isostatic press for cold isostatic pressing. The parameters of the cold isostatic pressing are: the pressure is 200 MPa and the pressure holding time is 5 min to obtain a ceramic mass.

[0047] S3. Crush the ceramic mass, then sieve it with a sieve mesh, and select the powder in the range of 100 - 200 mesh as the powder for binder jet printing to obtain granulated powder.

[0048] The loose bulk density of the silicon nitride granulated powder prepared in this example is 0.858 g / cm 3 , the median diameter is 12.51 μm, which is 23.86% higher than that of the silicon nitride powder before granulation, and the fluidity of the powder is also greatly improved, and it can be smoothly used for binder jet printing.

[0049] The silicon nitride granulated powder prepared in this example was subjected to binder jet printing and then pressure sintered at a temperature of 1800 °C and a nitrogen pressure of 2 MPa for 4 h. The density of the sintered sample was 52.37%, and the flexural strength was 8.86 MPa.

[0050] Comparative Example 1

[0051] S1. 500 g of Al2O3 ceramic powder with a particle size of 200 nm, 500 g of deionized water, and 500 g of grinding balls were added to a ball mill jar and ball milled at a rotation speed of 300 rpm for 3 h to obtain a ceramic slurry. Subsequently, the ceramic slurry was dried and then passed through a 100-mesh sieve to obtain a mixed powder.

[0052] S2. The mixed powder was placed in a vacuum bag for vacuuming and then subjected to cold isostatic pressing in a cold isostatic press. The parameters of the cold isostatic pressing were: pressure of 100 MPa and holding time of 5 min to obtain a ceramic block.

[0053] S3. The ceramic block was crushed and then screened with a sieve. The powder in the range of 100 - 200 meshes was selected as the powder for binder jet printing to obtain granulated powder.

[0054] The loose bulk density of the alumina granulated powder prepared in this case was 0.995 g / cm 3 , which was 22.39% higher than that of the alumina powder before granulation.

[0055] The alumina granulated powder prepared in this case was subjected to binder jet printing and sintered at a temperature of 1600 °C for 120 min. The density of the sintered sample was 48.39%, and the flexural strength was 2.28 MPa.

[0056] Comparative Example 2

[0057] S1. 500 g of Al2O3 ceramic powder with a particle size of 200 nm, 500 g of deionized water, and 500 g of grinding balls were added to a ball mill jar and ball milled at a rotation speed of 300 rpm for 3 h to obtain a ceramic slurry. Subsequently, the ceramic slurry was dried and then passed through a 100-mesh sieve to obtain a mixed powder.

[0058] S2. The mixed powder was placed in a vacuum bag for vacuuming and then subjected to cold isostatic pressing in a cold isostatic press. The parameters of the cold isostatic pressing were: pressure of 300 MPa and holding time of 5 min to obtain a ceramic block.

[0059] S3. The ceramic block was crushed and then screened with a sieve. The powder in the range of 100 - 200 meshes was selected as the powder for binder jet printing to obtain granulated powder.

[0060] The loose bulk density of the alumina granulated powder prepared in this example is 1.043 g / cm 3 , which is 28.29% higher than that of the alumina powder before granulation.

[0061] The alumina granulated powder prepared in this example was subjected to binder jet printing and sintered at a temperature of 1600 °C for 120 min. The density of the sintered sample was 51.87%, and the flexural strength was 3.08 MPa.

[0062] Comparative Example 3

[0063] S1. Take 500 g of Al2O3 ceramic powder with a particle size of 200 nm, 500 g of deionized water, and 500 g of grinding balls and add them to the ball mill tank. Ball mill for 3 h at a rotation speed of 300 rpm to obtain a ceramic slurry. Then, dry the ceramic slurry and pass it through a 100-mesh sieve to obtain a mixed powder.

[0064] S2. Place the mixed powder in a vacuum bag for vacuuming, and then place it in a cold isostatic press for cold isostatic pressing. The parameters of the cold isostatic pressing are: pressure of 400 MPa and holding time of 5 min to obtain a ceramic block.

[0065] S3. Crush the ceramic block, then screen it with a sieve, and select the powder in the range of 100-200 mesh as the powder for binder jet printing to obtain granulated powder.

[0066] The loose bulk density of the alumina granulated powder prepared in this example is 1.047 g / cm 3 , which is 28.78% higher than that of the alumina powder before granulation.

[0067] The alumina granulated powder prepared in this example was subjected to binder jet printing and sintered at a temperature of 1600 °C for 120 min. The density of the sintered sample was 51.93%, and the flexural strength was 3.10 MPa.

[0068] Comparative Example 4

[0069] S1. Take 500 g of Al2O3 ceramic powder with a particle size of 200 nm, 500 g of deionized water, and 500 g of grinding balls and add them to the ball mill tank. Ball mill for 3 h at a rotation speed of 300 rpm to obtain a ceramic slurry. Then, dry the ceramic slurry and pass it through a 100-mesh sieve to obtain a mixed powder.

[0070] S2. Place the mixed powder in a vacuum bag for vacuuming, and then place it in a cold isostatic press for cold isostatic pressing. The parameters of the cold isostatic pressing are: pressure of 200 MPa and holding time of 2 min to obtain a ceramic block.

[0071] S3. Crush the ceramic mass, then screen it with a sieve, and select the powder in the range of 100 - 200 mesh as the powder for binder jet printing to obtain granulated powder.

[0072] The loose bulk density of the alumina granulated powder prepared in this case is 1.002 g / cm 3 , which is 23.25% higher than that of the alumina powder before granulation.

[0073] Perform binder jet printing on the alumina granulated powder prepared in this case, sinter it at a temperature of 1600 °C for 120 min. The density of the sintered sample is 49.39%, and the flexural strength is 2.52 MPa.

[0074] Comparative Example 5

[0075] S1. Take 500 g of Al2O3 ceramic powder with a particle size of 200 nm, 500 g of deionized water, and 500 g of grinding balls and add them to a ball mill tank. Ball mill for 3 h at a rotation speed of 300 rpm to obtain a ceramic slurry. Then dry the ceramic slurry and pass it through a 100 - mesh sieve to obtain a mixed powder.

[0076] S2. Place the mixed powder in a vacuum bag for vacuuming, and then place it in a cold isostatic press for cold isostatic pressing. The parameters of the cold isostatic pressing are: pressure of 400 MPa, holding time of 5 min, to obtain a ceramic mass.

[0077] S3. Crush the ceramic mass, then screen it with a sieve, and select the powder in the range of 100 - 200 mesh as the powder for binder jet printing to obtain granulated powder.

[0078] The loose bulk density of the alumina granulated powder prepared in this case is 1.028 g / cm 3 , which is 26.45% higher than that of the alumina powder before granulation.

[0079] Perform binder jet printing on the alumina granulated powder prepared in this case, sinter it at a temperature of 1600 °C for 120 min. The density of the sintered sample is 50.32%, and the flexural strength is 2.83 MPa.

[0080] Comparative Example 6

[0081] S1. Take 500 g of Al2O3 ceramic powder with a particle size of 200 nm, 500 g of deionized water, and 500 g of grinding balls and add them to a ball mill tank. Ball mill for 3 h at a rotation speed of 300 rpm to obtain a ceramic slurry. Then dry the ceramic slurry and pass it through a 100 - mesh sieve to obtain a mixed powder.

[0082] S2. Place the mixed powder into a vacuum bag for vacuum pumping, and then place it in a cold isostatic press for cold isostatic pressing. The parameters of the cold isostatic pressing are: pressure of 400 MPa and holding time of 5 min to obtain a ceramic block.

[0083] S3. Crush the ceramic block, and then screen it with a sieve. Select the powder in the range of 100 - 200 mesh as the powder for binder jet printing to obtain granulated powder.

[0084] The loose bulk density of the alumina granulated powder prepared in this example is 1.029 g / cm 3 , which is increased by 26.57% compared with the alumina powder before granulation.

[0085] Carry out binder jet printing on the alumina granulated powder prepared in this example, sinter at a temperature of 1600 °C for 120 min. The density of the sintered sample is 50.37%, and the flexural strength is 2.84 MPa.

[0086] Comparative Example 7

[0087] S1. Take 500 g of Al2O3 ceramic powder with a particle size of 200 nm, 500 g of deionized water, and 500 g of grinding balls and add them to a ball mill tank. Ball mill for 3 h at a rotation speed of 300 rpm to obtain a ceramic slurry. Then dry the ceramic slurry and pass it through a 100-mesh sieve to obtain a mixed powder.

[0088] S2. Place the mixed powder into a vacuum bag for vacuum pumping, and then place it in a cold isostatic press for cold isostatic pressing. The parameters of the cold isostatic pressing are: pressure of 400 MPa and holding time of 5 min to obtain a ceramic block.

[0089] S3. Crush the ceramic block, and then screen it with a sieve. Select the powder in the range of 100 - 200 mesh as the powder for binder jet printing to obtain granulated powder.

[0090] The loose bulk density of the alumina granulated powder prepared in this example is 1.050 g / cm 3 , which is increased by 29.15% compared with the alumina powder before granulation.

[0091] Carry out binder jet printing on the alumina granulated powder prepared in this example, sinter at a temperature of 1600 °C for 120 min. The density of the sintered sample is 51.96%, and the flexural strength is 3.12 MPa.

[0092] Summarize the granulation parameters, the properties of the granulated powder obtained, and the ceramic properties in Example 1 and Comparative Examples 1 - 7 as shown in Table 1 below.

[0093] Table 1 Granulation parameters in Example 1 and Comparative Examples 1-7 and properties of the granulated powders obtained

[0094]

[0095] As can be seen from the results in Table 1, the bulk density of the granulated powders prepared by the cold isostatic pressing process has been significantly improved compared with the original powders. Different cold isostatic pressing process parameters result in different properties of the granulated powders. Under the condition of a constant holding pressure time of 5 min, the influence of the cold isostatic pressure on the bulk density of the powder shows a significant non-linear characteristic: when the pressure is gradually increased from 100 MPa to 300 MPa, the bulk density of the powder correspondingly increases from 0.995 g / cm 3 to 1.043 g / cm 3 , with an increase of 4.82%; however, when the pressure continues to increase to 400 MPa, the density only slightly increases from 1.043 g / cm 3 to 1.050 g / cm 3 , and the increase rate drops sharply to 0.67%. This indicates that the ceramic mass has been fully compacted after exceeding 300 MPa, and the marginal benefit of continued pressure increase is significantly reduced.

[0096] Under the condition of a fixed pressure of 200 MPa, there is a critical threshold effect on the influence of the holding time on the bulk density of the powder. When the holding time is extended from 2 minutes to 8 minutes, the powder density steadily increases from 1.002 g / cm 3 to 1.028 g / cm 3 ; however, after the holding time exceeds 8 minutes (up to 11 minutes), the density only slightly increases to 1.029 g / cm 3 , with an increase rate of less than 0.097%, confirming that the powder compaction process has been basically completed at the 8-minute node.

[0097] It can be understood that the pressure and holding time of the cold isostatic pressing treatment can be flexibly adjusted according to different ceramic systems to balance the particle densification and redispersibility, ensuring that the granulated powder has sufficient mechanical strength to resist breakage during the powder spreading process and can accurately control the target particle size distribution through subsequent crushing and screening.

[0098] In the above embodiments, the descriptions of each embodiment have their own focuses. For parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0099] The above is the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A granulation method for preparing binder jet printing powder based on cold isostatic pressing process, characterized in that, It includes the following steps: S1. By mass, 20 - 60 parts of ceramic powder and 0 - 6.0 parts of additive are subjected to ball milling treatment, dried after mixing evenly, and sieved through a 80 - 120 mesh sieve to obtain a mixed powder; S2. The mixed powder is subjected to cold isostatic pressing treatment to obtain a ceramic block; S3. The ceramic block is crushed, and the powder within a preset particle size range is taken to obtain the binder jet printing powder.

2. The granulation method for preparing binder jet printing powder based on the cold isostatic pressing process according to claim 1, wherein, In step S2, the pressure of the cold isostatic pressing treatment is 20 - 500 MPa, and the pressure holding time is 2 - 20 min.

3. The granulation method for preparing binder jet printing powder based on the cold isostatic pressing process according to claim 1, wherein, In step S2, it further includes placing the mixed powder obtained in step S1 in a vacuum bag for vacuum treatment, and then performing cold isostatic pressing treatment.

4. The granulation method for preparing binder jet printing powder based on the cold isostatic pressing process according to claim 1, characterized in that, The preset particle size range in step S3 is 50 - 400 mesh.

5. The granulation method for preparing binder jet printing powder based on the cold isostatic pressing process according to claim 1, wherein The particle size of the ceramic powder is 0.02 - 20 μm.

6. The granulation method for preparing binder jet printing powder based on the cold isostatic pressing process according to claim 1, characterized in that The ceramic powder is selected from at least one of oxide ceramic powder, nitride ceramic powder, carbide ceramic powder, and high-entropy ceramic powder.

7. The granulation method for preparing binder jet printing powder based on the cold isostatic pressing process according to claim 1, characterized in that, The additive is selected from at least one of graphene, Re x E y , where Re is Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb or Lu, and E is O, F or H.

8. The granulation method for preparing binder jet printing powder based on cold isostatic pressing process according to claim 1, characterized in that, In step S1, the rotation speed of the ball milling treatment is 100 - 800 r / min, and the time is 1 - 15 h.

9. A powder for binder jet printing, characterized in that, It is prepared by the granulation method for preparing the binder jet printing powder based on the cold isostatic pressing process according to any one of claims 1 - 8.

10. A method for preparing a ceramic body by binder jet printing, characterized in that, It is prepared by using the powder for binder jet printing according to claim 9, or by using the powder prepared by the granulation method for preparing the binder jet printing powder based on the cold isostatic pressing process according to any one of claims 1 - 8.

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