Ceramic powder modification method, ceramic slurry and application

Abstract

The application belongs to the technical field of photocuring printing, and particularly relates to a ceramic powder modification method, ceramic slurry and application. The application improves the refractive index of the powder by surface functionalization modification of the ceramic powder, further improves the solidification depth of the slurry, and can meet the solidification of the wall thickness of the ceramic wedge blank when the photocuring auxiliary direct writing printing forms the ceramic wedge blank. The ceramic slurry prepared by using the functionally modified ceramic powder can reduce the surface roughness of the ceramic wedge, so that the surface roughness Ra of the extrusion formed ceramic wedge is reduced to below 0.15 microns (at present, the fluctuation range of the surface of the ceramic blank prepared by using photocuring 3D printing is about 5 microns), the surface of the ceramic blank is uniform and smooth, the problem that the surface precision of the direct writing formed ceramic wedge is difficult to improve is solved, so that the surface roughness value of the ceramic wedge is too large to cause the contamination of the welding nozzle surface, the service life of the wedge is prolonged, and the wear of the metal welding wire is reduced.

Description

Technical Field

[0001] This invention belongs to the field of photopolymerization printing technology, specifically relating to a method for modifying ceramic powder, ceramic slurry, and its applications. Background Technology

[0002] Ceramic wedges are commonly used as essential tools in the wire bonding process of electronic packaging, widely applied in the bonding and packaging of chips, transistors, and circuit boards, serving to facilitate information exchange and electronic interconnection. Currently, conventional methods for forming ceramic wedges include injection molding and machine tool grinding. However, traditional methods suffer from complex production processes, long processing cycles, inconsistent dimensional accuracy, and the need for expensive molds, machining tools, and grinding jigs.

[0003] A Chinese patent discloses an alumina ceramic chopping tool based on photopolymerization molding and its preparation method. Specifically, this method involves photopolymerization 3D printing to manufacture the ceramic chopping tool. The principle is to use a 3D printer to expose each layer to ultraviolet light, achieving layer-by-layer stacking printing. However, this layer-by-layer printing method easily creates a "step effect" on the surface, resulting in high surface roughness, i.e., a wavy structure with varying heights. This significantly affects the surface forming quality of the chopping tool and also exacerbates the wear on the chopping tool surface caused by the metal wires during wire bonding.

[0004] Therefore, it is necessary to explore a method for manufacturing ceramic wedges using continuous 3D printing. Currently, the ceramic materials commonly used in photopolymer-assisted direct-write printing have high refractive index and high absorbance, resulting in insufficient curing depth of the prepared photosensitive ceramic slurry to maintain the stability of the preform. In other words, the curing limit of conventional photosensitive ceramic slurries is lower than the diameter of the ceramic wedge body, making it insufficient to achieve proper curing and shaping of the ceramic wedge and ensure preform stability.

[0005] Therefore, it is necessary to explore a technology to improve the curing depth of ceramic slurry in order to realize the technology of photopolymerization-assisted direct writing continuous 3D printing of ceramic cleavers. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the existing ceramic slurry, such as low curing depth and inability to realize photopolymerization-assisted direct writing continuous 3D printing of ceramic wedges, so as to provide a ceramic powder modification method, ceramic slurry and its application.

[0007] Therefore, the present invention provides the following technical solution:

[0008] This invention provides a method for modifying ceramic powder, comprising the following steps:

[0009] S1, the modifier is mixed with a photoinitiator and prepolymerized under ultraviolet light irradiation to obtain a modifier prepolymer; wherein the modifier has the composition shown in the following formula:

[0010] Among them, at least one of X1, X2, and X3 is an alkoxy group with 1-5 carbon atoms; Y represents an acrylate group, and R is C2-C. 20 carbon chain or C2-C 20 A heterochain containing heteroatoms; n is an integer between 1 and 5;

[0011] S2, the obtained modifier prepolymer is mixed with an organic solvent and hydrolyzed to obtain a hydrolyzed modifier;

[0012] S3, add ceramic powder to hydrolysis modifier, stir, reflux, separate the product, and obtain modified ceramic powder.

[0013] Optionally, Y in the modifier has the following structure:

[0014] Wherein, R1 is -H or a C1-C5 alkyl group;

[0015] And / or, the alkoxy group is ethoxy or methoxy;

[0016] And / or, the heteroatom is at least one of S, N or O.

[0017] Optionally, the modifier includes at least one of 3-methacryloxypropylmethyldimethoxysilane (CAS No. 14513-34-9), 3-methacryloxypropyltrimethoxysilane (CAS No. 2530-85-0), 3-methacryloxypropylmethyldiethoxysilane (CAS No. 65100-04-1), 3-methacryloxypropyltriethoxysilane (CAS No. 21142-29-0), methacryloxypropyldimethylmethoxysilane (CAS No. 66753-64-8), and 3-(acryloxy)propyltrimethoxysilane (CAS No. 4369-14-6).

[0018] Optionally, in step S1, the prepolymerization step under ultraviolet light irradiation includes: irradiating at a wavelength of 355–460 nm and an irradiation power of 50–150 mW / cm². 2 Irradiate under ultraviolet light for 1–30 seconds, then shield from light and mix thoroughly;

[0019] And / or, in step S2, the hydrolysis is carried out at room temperature for 1-2 hours;

[0020] And / or, in step S3, the stirring time is 1-2 hours;

[0021] And / or, in step S3, the reflux temperature is 70-90℃ and the reflux time is 4-8h.

[0022] And / or, in step S3, the product is separated by washing with an aqueous ethanol solution and centrifuging, 3-5 times.

[0023] Optionally, the method for modifying the ceramic powder satisfies at least one of the following (1)-(7):

[0024] (1) The amount of the modifier is 20-90% of the mass of the ceramic powder;

[0025] (2) The amount of the photoinitiator is 0.01-0.5% of the mass of the modifier;

[0026] (3) The amount of organic solvent used is 1-100 times the mass of ceramic powder;

[0027] (4) The pH of the organic solvent is 4-5;

[0028] (5) The organic solvent is an ethanol solution with a concentration of 70 wt% or higher, or an isopropanol solution with a concentration of 70 wt% or higher;

[0029] (6) The photoinitiator includes at least one of phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide (819), 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO), and bis(2,6-difluoro-3-pyrrolephenylferrocene) (784);

[0030] (7) In step S3, the ceramic powder is first mixed with a portion of the organic solvent and then added to the hydrolysis modifier; optionally, the portion of the organic solvent accounts for 20-50% of the total organic solvent mass.

[0031] The present invention also provides a modified ceramic powder obtained by the above-described modification method.

[0032] The present invention also provides a ceramic slurry comprising the above-mentioned modified ceramic powder.

[0033] Optionally, the ceramic slurry, based on its total mass, includes the following components in parts by mass:

[0034] 70-90 parts modified ceramic powder, 9-25 parts photosensitive resin, 4.5-12.5 parts dispersant, and 0.01-0.5 parts photoinitiator.

[0035] In this invention, the selection of other raw materials is conventional in the field. Typically, without limitation, the ceramic powder includes at least one of alumina, chromium oxide, titanium oxide, zirconium oxide, yttrium oxide, cerium oxide, silicon oxide, magnesium oxide, and calcium oxide.

[0036] The photosensitive resin includes at least one of epoxy acrylate resin, polyurethane acrylate resin, polyester acrylate, and polyether acrylate;

[0037] The dispersant includes at least one of BYK180, DIG Dispers 655, and METOLAT 394;

[0038] The photoinitiator includes at least one of phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide (photoinitiator 819), 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO), and bis(2,6-difluoro-3-pyrrolephenyldicarboxylate) (784).

[0039] The present invention also provides an application of the above-mentioned ceramic slurry in photopolymerization-assisted direct writing continuous 3D printing of ceramic cleavers.

[0040] Optionally, the application includes the following steps:

[0041] S11, insert the needle nozzle into the prefabricated steel needle on the ceramic support plate, continuously extrude the ceramic slurry through inert gas, and then cure and shape it with ultraviolet light to obtain the green body;

[0042] S12 involves two-stage curing, drying, debinding, and sintering of the green body to obtain a ceramic chopping knife.

[0043] Optionally, a release agent can be pre-sprayed onto the pre-fabricated steel pins on the ceramic support plate.

[0044] The specific parameters in the above application process of this invention are as follows: the moving speed of the nozzle is 0.1 to 10 mm / s, and the air pressure is 10 to 50 MPa; the size of the ceramic chopping knife can be adjusted by the moving speed of the nozzle and the air pressure, and those skilled in the art can adjust it according to actual needs.

[0045] The release agent includes at least one of silicone oil, polyethylene wax, glycerin, and petrolatum;

[0046] The moving speed of the light source is the same as that of the nozzle, and the power of the light source is 20–200 mW / cm². 2 The inner diameter of the light-shielding barrel is 9.5–22.5 mm;

[0047] The inner diameter of the auxiliary direct-write printing nozzle is 0.2–1 mm;

[0048] The diameter of the small-diameter steel needles on the forming platform is 0.02–0.1 mm;

[0049] The power of the light source used for secondary curing is 100–300 mW / cm. 2 The duration is 1 to 600 seconds;

[0050] The drying temperature is 45–75℃, and the drying time is 1–3 hours.

[0051] The glue discharge temperature is 400-550℃, the heat preservation time is 4-8h, and the heating rate is 50-100℃ / h;

[0052] The sintering temperature is 1500–1700℃, the holding time is 5–10h, and the heating rate is 60–240℃ / h.

[0053] In this invention, the sintering and debinding processes can be carried out in stages, which are all conventional operations in the field and are not specifically limited here.

[0054] The main technical challenge addressed by this invention is that current technologies, whether based on extrusion principles such as Direct Ink Writing (DIW), photopolymerization principles such as Digital Light Processing (DLP), or a combination of both, struggle to achieve high-smoothness and high-precision 3D printing of the internal microporous structure of ceramic wedges. This limits further research and large-scale industrial production applications of 3D-printed ceramic wedges.

[0055] The technical solution of this invention has the following advantages:

[0056] The ceramic powder modification method provided by this invention improves the refractive index of the ceramic powder by surface functionalization, thereby increasing the curing depth of the slurry. When using photopolymer-assisted direct-write printing to form ceramic wedge blanks, it can meet the curing requirements of the ceramic wedge blank wall thickness (the wall thickness of the ceramic wedge is 400-600 micrometers, and the current curing depth range for photopolymer 3D printing is 200-300 μm). The ceramic slurry prepared using functionally modified ceramic powder can reduce the surface roughness of the ceramic wedge, lowering the surface roughness Ra of the extruded ceramic wedge to below 0.15 μm. Currently, the surface fluctuation range of ceramic blanks prepared using photopolymer 3D printing is approximately 5 μm, achieving a uniform and smooth ceramic blank surface. This solves the problem of difficulty in improving the surface precision of ceramic wedges formed by direct-write printing, thus avoiding excessive surface roughness values ​​that could lead to nozzle contamination, extending the wedge's service life, and reducing metal wire wear.

[0057] The ceramic slurry provided in this invention is used in photopolymer-assisted direct-write continuous 3D printing of ceramic wedges. After photopolymerization, a green body is obtained on the forming platform. The green body can maintain good macroscopic structural characteristics. At the same time, the use of functionally modified ceramic powder helps to improve the viscoelasticity of the direct-write material, solving problems such as structural collapse, warping, and deformation during the overall printing process of the ceramic wedge green body. The application method has the advantages of simple process, low cost, low material loss, and few ceramic defects, which helps to mass-produce ceramic wedges, reduce costs and increase efficiency. In addition, the curing width inside the wedge is restricted by the steel needle and cannot continue to expand the curing, thereby optimizing the forming of the inner hole of the ceramic wedge, effectively controlling the forming accuracy of the internal and external dimensions of the ceramic wedge, and enhancing the mechanical strength and relative density of the ceramic wedge. Attached Figure Description

[0058] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0059] Figure 1 This is a schematic diagram of the printing device used in an embodiment of the present invention;

[0060] Figure label:

[0061] 1. Light-shielding barrel; 2. Precast steel needle; 3. Light source; 4. Nozzle; 5. Ceramic support plate. Detailed Implementation

[0062] The following embodiments are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.

[0063] For experiments not specifically described in the examples, the procedures or conditions should be followed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0064] In the following examples and comparative examples, 1 part = 1g.

[0065] Example 1

[0066] This embodiment provides a method for photopolymerization-assisted direct-write continuous 3D printing of ceramic wedges, including the following steps:

[0067] Step 1: Prepolymerization of the modifier: First, prepare 300 parts of an ethanol-water solution containing 30wt% water, adjust the pH to 4 with acetic acid, and ultrasonically disperse for 30 min to obtain an organic solvent; take 90% of 3-(acryloyloxy)propyltrimethoxysilane monomer (relative to the mass of the added dried ceramic powder) in a beaker, add 0.5% photoinitiator TPO (relative to the mass of the added monomer), and then irradiate with a light source with a wavelength of 405nm for 30s to obtain the modifier prepolymer, which is stored in the dark for later use.

[0068] Step 2, Ceramic Powder Modification: Take 200 parts of the above organic solvent and add it to the TMSPA prepolymer obtained above. Stir magnetically at room temperature for 2 hours to hydrolyze and obtain the hydrolyzed functional modifier. Take the remaining organic solvent above and add 50 parts of dried ceramic powder (zirconia toughened alumina containing 0.6% chromium oxide) to a three-necked flask and stir to form a particle suspension. Add the hydrolyzed functional modifier to the above particle suspension and stir continuously at room temperature for 2 hours. Then reflux at 90°C for 8 hours. After drying and grinding, obtain the functionalized ceramic powder.

[0069] Step 3: Preparation of Ceramic Slurry: The photocurable ceramic slurry is measured by weight and contains 90 parts of functionalized modified ceramic powder, 9 parts of polyurethane acrylic resin (Yuming Chemical Co., Ltd., 6264), 0.95 parts of dispersant BYK180, and 0.5 parts of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO). The slurry is degassed and mixed evenly using a vacuum degassing machine at 2000 rpm for 5 minutes. A photocurable ceramic slurry is obtained.

[0070] Step 4, Printing Steps: Use as follows Figure 1 The apparatus shown injects ceramic slurry into a light-proof cylinder 1 with an inner diameter of 22.5 mm. Glycerin is sprayed onto the prefabricated steel needles 2 on the ceramic support plate 5. The cylinder nozzle 4 with an inner diameter of 1 mm is inserted into the ceramic support plate 5 at a height of 0.05 mm from the end of the prefabricated steel needle 2 with a diameter of 0.02 mm, allowing the ceramic slurry to be extruded smoothly. Nitrogen gas with an initial pressure of 50 MPa is introduced into the cylinder to ensure continuous extrusion of the ceramic slurry.

[0071] In the initial printing stage of the ceramic chopping blade, the slurry is extruded through nozzle 4 at the bottom of the printing process. The nozzle's moving speed is 0.1 mm / s, the air pressure is 50 MPa, the light source 3's moving speed is 0.1 mm / s, and the light source power is 200 mW / cm². 2In the first stage, a light source with a wavelength of 405nm is used. In the second stage, the tip of the ceramic chopping blade is printed. The nozzle moving speed is increased to 10mm / s, the air pressure is 10MPa, the light source moving speed is increased to 10mm / s, and the light source with a wavelength of 405nm is used. The characteristic of photosensitive resin to absorb ultraviolet light for curing is utilized to promote the rapid curing of the slurry surface to form a hardened layer. After printing, a ceramic chopping blade blank is obtained.

[0072] The secondary curing method is as follows: the ceramic chopping knife is placed in a position with a power of 300mW / cm 2 Under LED light source conditions, cure for 600 seconds.

[0073] The drying method is as follows: drying and maintaining the temperature in a vacuum constant temperature environment at 75℃ for 3 hours.

[0074] The method for removing the adhesive is as follows: the ceramic blank is first heated to 400℃ at a heating rate of 100℃ / h and held for 4 hours, then heated to 550℃ at a heating rate of 50℃ / h and held for 4 hours. The entire process is carried out under air atmosphere conditions.

[0075] The sintering method is as follows: the ceramic green body is heated to 1000℃ at a rate of 240℃ / h and held for 5 hours, then heated to 1700℃ at a rate of 60℃ / h and held for 5 hours. The entire process is carried out in an air atmosphere.

[0076] Example 2

[0077] This embodiment provides a method for preparing a photopolymerization-assisted direct writing continuous 3D printed ceramic wedge. Compared with Example 1, the only difference is that the initiator is 0.01% during the prepolymerization of the functional modifier.

[0078] Example 3

[0079] This embodiment provides a method for preparing a photopolymerization-assisted direct writing continuous 3D printed ceramic chopping tool. The only difference from Example 1 is that the prepolymerized functional modifier is 3-methacryloyloxypropylmethyldimethoxysilane.

[0080] Example 4

[0081] This embodiment provides a method for preparing a photopolymerization-assisted direct-write continuous 3D printed ceramic wedge. The only difference from Embodiment 1 is that the prepolymerized functional modifier is selected as oxypropyl methoxysilane.

[0082] Example 5

[0083] This embodiment provides a method for preparing a photopolymerization-assisted direct writing continuous 3D printing ceramic wedge. Compared with Embodiment 1, the only difference is that in step one, the amount of prepolymerized functional modifier added accounts for 20% of the mass of the ceramic powder.

[0084] Example 6

[0085] This embodiment provides a method for preparing a photopolymerization-assisted direct writing continuous 3D printed ceramic wedge. Compared with Embodiment 1, the only difference is that the irradiation time for the prepolymerization of the functional modifier in step one is 1 second.

[0086] Comparative Example 1

[0087] This comparative example provides a method for preparing a photopolymerization-assisted direct-write continuous 3D printing ceramic wedge. The only difference from Example 1 is that no functional modifier is used to modify the ceramic powder, and the ceramic powder is used directly.

[0088] Comparative Example 2

[0089] This comparative example provides a method for preparing a photopolymer-assisted direct-write continuous 3D printed ceramic chopping tool. The only difference from Example 1 is that an equal mass of surface modifier KH550 is used instead of 3-(acryloyloxy)propyltrimethoxysilane.

[0090] Comparative Example 3

[0091] This comparative example provides a method for preparing a photopolymerization-assisted direct-write continuous 3D printed ceramic chopping tool. The only difference from Example 1 is that it uses 3-(acryloyloxy)propyltrimethoxysilane monomer that has not been prepolymerized, i.e., it does not include the prepolymerization step in step one.

[0092] Comparative Example 4

[0093] This comparative example provides a method for preparing a ceramic chopping knife. The only difference from Example 1 is that it is formed by DLP photopolymerization 3D printing, and the thickness of the slice layer in the Z-axis direction of the chopping knife model is 100μm.

[0094] Test case

[0095] The materials of each embodiment and comparative example were subjected to performance testing experiments. The specific testing methods are as follows:

[0096] The relative density was tested using Archimedes' method of displacement.

[0097] The curing depth of the slurry was tested under different exposure energies, and the curing depth of the slurry as a function of exposure energy was obtained. The maximum curing depth refers to the test value when the curing depth no longer increases significantly with the increase of exposure energy.

[0098] Surface roughness was measured in accordance with the test method of GB / T 3505-2000 "Product Geometric Technical Specifications: Surface Structure Profile Method - Terminology, Definitions and Parameters".

[0099] The flexural strength was measured according to the test method in GB / T 4741-1999 "Test Method for Flexural Strength of Ceramic Materials";

[0100] Hardness was measured according to the test method in GB / T 16534-2009 "Test Method for Room Temperature Hardness of Fine Ceramics"; the specific test results are shown in Table 1.

[0101] Table 1

[0102]

[0103] According to the test results in Table 1, the examples show an improved maximum curing depth compared to the comparative examples, which can meet the curing requirements of the ceramic wedge blank wall thickness, while the surface roughness Ra of the ceramic wedge is reduced to below 0.15 μm. Specifically, compared with Example 1, Examples 2, 3, 4, 5, and 6 all show a downward trend in overall performance, indicating that the various properties of the ceramic wedge are greatly affected by the modification effect of the powder surface coating. The powder surface coating is related to the content of initiator, the type and content of modifier monomers, and the irradiation time of prepolymerization during the prepolymerization process. Reducing the content of initiator during prepolymerization, reducing the number of alkoxy groups that can be hydrolyzed and grafted onto the powder surface in the functional modifier monomers, reducing the content of functional modifiers, and reducing the irradiation time of prepolymerization will all lead to a decrease in the degree of functional modification of the powder surface, resulting in a decrease in the curing performance of the slurry and a decrease in the maximum curing depth of the slurry. Example 1 has the best performance in terms of relative density, surface roughness, flexural strength, and hardness, which shows that selecting the prepolymerization process parameters can achieve better technical results.

[0104] Comparative Examples 1-3, due to the lack of prepolymerized functional modifier monomers for powder surface grafting, resulted in a low curing depth. The same photopolymerization-assisted direct writing continuous 3D printing method was used on the ceramic chopping knife model, which made it difficult for the part near the steel needle to be cured. After the steel needle was removed, the blank collapsed, causing the ceramic chopping knife prepared by this method to fail to form. Therefore, the relative density, surface roughness, flexural strength and hardness after sintering could not be measured.

[0105] Compared with Comparative Example 1, Comparative Example 4 was formed by DLP photopolymerization 3D printing. Since the DLP forming principle is to stack layers one by one, the surface roughness of the printed ceramic chopping knife is higher.

[0106] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. The application of a ceramic slurry in photopolymer-assisted direct-write continuous 3D printing of ceramic wedges, characterized in that, The ceramic slurry includes modified ceramic powder, and the modification method of the modified ceramic powder includes the following steps: S1, the modifier is mixed with a photoinitiator and prepolymerized under ultraviolet light irradiation to obtain a modifier prepolymer; wherein the modifier has the composition shown in the following formula: Among them, at least one of X1, X2, and X3 is an alkoxy group with 1-5 carbon atoms; Y represents an acrylate group, and R is C2-C 20 carbon chain or C2-C 20 The heterochain containing heteroatoms; n is an integer between 1 and 5; the amount of the modifier is 20-90% of the mass of the ceramic powder; S2, the obtained modifier prepolymer is mixed with an organic solvent and hydrolyzed to obtain a hydrolyzed modifier; S3, add ceramic powder to hydrolysis modifier, stir, reflux, separate the product, and obtain modified ceramic powder.

2. The application according to claim 1, characterized in that, The modifier Y has the following structure: Wherein, R1 is a -H or C1-C5 alkyl group; And / or, the alkoxy group is ethoxy or methoxy; And / or, the heteroatom is at least one of S, N or O.

3. The application according to claim 1, characterized in that, The modifier includes at least one of 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, methacryloxypropyldimethylmethoxysilane, and 3-(acryloxy)propyltrimethoxysilane.

4. The application according to any one of claims 1-3, characterized in that, Step S1, the prepolymerization step under ultraviolet light irradiation includes: irradiation at a wavelength of 355~460nm and an irradiation power of 50~150mW / cm. 2 Irradiate under ultraviolet light for 1-30 seconds, then shield from light and mix thoroughly; And / or, in step S2, the hydrolysis is carried out at room temperature for 1-2 hours; And / or, in step S3, the stirring time is 1-2 hours; And / or, in step S3, the reflux temperature is 70-90℃ and the reflux time is 4-8h.

5. The application according to any one of claims 1-3, characterized in that, Satisfy at least one of the following (1)-(6): (1) The amount of the photoinitiator is 0.01-0.5% of the mass of the modifier; (2) The amount of organic solvent used is 1-100 times the mass of the ceramic powder; (3) The pH of the organic solvent is 4-5; (4) The organic solvent is an ethanol solution with a concentration of 70 wt% or higher, or an isopropanol solution with a concentration of 70 wt% or higher; (5) The photoinitiator includes at least one of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and bis(2,6-difluoro-3-pyrrolephenyldicyclopentadiene); (6) In step S3, the ceramic powder is first mixed with a portion of the organic solvent and then added to the hydrolysis modifier.

6. The application according to any one of claims 1-3, characterized in that, The total mass of the ceramic slurry includes the following components in parts by mass: 70-90 parts modified ceramic powder, 9-25 parts photosensitive resin, 4.5-12.5 parts dispersant, 0.01-0.5 parts photoinitiator.

7. The application according to claim 6, characterized in that, Includes the following steps: S11, insert the needle nozzle into the prefabricated steel needle on the ceramic support plate, continuously extrude the ceramic slurry through inert gas, and then cure and shape it with ultraviolet light to obtain the green body; S12 involves subjecting the green body to secondary curing, drying, debinding, and sintering to obtain a ceramic chopping knife.

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