Light-cured silicon-based ceramic core slurry for investment casting and its preparation method and application

Abstract

The present invention belongs to the field of precision casting technology, and discloses a photocurable silicon-based ceramic core slurry for investment casting, and its preparation method and application. Based on the total weight of 100 parts of the silicon-based ceramic core slurry of the present invention, it comprises the following components: 70 to 85 parts of ceramic powder, 10 to 25 parts of photosensitive resin, 2 to 5 parts of photoinitiator, 1 to 5 parts of dispersant, 0.2 to 1.2 parts of anti-settling agent and 0.01 to 0.2 parts of light absorber; the ceramic powder is composed of fused quartz powder, alumina ceramic powder and zirconium silicate ceramic powder in a weight ratio of 50 to 90:5 to 15:2 to 10. The slurry has stable flow and sedimentation performance and can be used for additive manufacturing of photocurable integrated silicon-based ceramic cores with high strength, high precision, low sintering shrinkage and high porosity, which is of great significance for the mass production of complex ceramic cores for investment casting industry.

Description

Technical Field

[0001] The invention belongs to the technical field of precision casting, and in particular relates to a light-cured silicon-based ceramic core slurry for investment casting, a preparation method thereof and an application thereof. Background Art

[0002] With the advancement of aviation technology, higher standards have been set for the temperature resistance of aircraft engine turbine blades. Ceramic cores are key transition parts in the manufacture of turbine blades. Based on the basic principles of fluid mechanics and heat transfer mechanics, the structure of the hollow blade cavity has become more complex, and more stringent requirements have been placed on the performance of ceramic cores. Traditional ceramic cores mainly use hot injection technology, which is suitable for the mass production of ceramic cores with simple structures. Due to mold limitations, it is relatively expensive, time-consuming, has low molding accuracy, and is difficult to meet the requirements of the preparation of ceramic cores with complex structures. The traditional process of preparing highly complex double-walled silicon-based cores and precision silicon-based inner cavities requires multiple sets of molds, which is complex and extremely costly.

[0003] Stereolithography 3D printing technology, with its mold-free molding process and wide tolerances for print model design and modification, is a key approach for developing complex ceramic cores. The urgent challenge for this technology is to develop silicon-based ceramic core casting slurries that exhibit high solids content, high molding accuracy, high printing performance, high reaction efficiency, and excellent stable flow and settling properties. This is crucial for ensuring the overall dimensions of hollow engine blades. Summary of the Invention

[0004] To address the shortcomings of the existing technology, the present invention provides a light-cured silicon-based ceramic core slurry for investment casting and a method for its preparation. This slurry exhibits stable flow and settling properties and can be used in additive manufacturing to produce high-strength (room temperature flexural strength ≥15 MPa, 1500°C high-temperature strength ≥20 MPa), high-precision (molding error ≤20 μm), and low sintering shrinkage (<2.5%) silicon-based ceramic cores through light-cured molding. This is of great significance for the mass production of complex ceramic cores for industrial investment casting.

[0005] In a first aspect, the present invention provides a photocurable silicon-based ceramic core slurry for investment casting, which comprises the following components based on 100 parts by total weight of the silicon-based ceramic core slurry: 70 to 85 parts of ceramic powder, 10 to 25 parts of photosensitive resin, 2 to 5 parts of photoinitiator, 1 to 5 parts of dispersant, 0.2 to 1.2 parts of anti-settling agent and 0.01 to 0.2 parts of light absorber; the ceramic powder is composed of fused quartz powder, alumina ceramic powder and zirconium silicate ceramic powder in a weight ratio of 50 to 90:5 to 15:2 to 10; the particle size of the fused quartz powder is 2 to 30 μm and the purity is ≥95wt%; the particle size of the alumina ceramic powder is 20 to 40 μm and the purity is ≥95wt%; the particle size of the zirconium silicate ceramic powder is 20 to 50 μm and the purity is ≥95wt%.

[0006] The particle size and purity of each powder raw material are important. When they are within the scope of the present invention, it is easy to prepare a light-cured silicon-based ceramic core with higher strength.

[0007] In some embodiments, the light absorber is a mixed azo compound, preferably a mixture of 2,2'-(3,3'-dichloro-1,1'-biphenyl-4,4'-disazo)bis[N-(2,4-dimethylphenyl)-3-oxo-butyramide], N,N-dimethyl-4-(phenylazo)aniline and 2,2'-[(3,3'-dichloro[1,1'-biphenyl]4,4'-diyl)bis(azo)]bis[N-(2-methylphenyl)]-3-oxobutyramide.

[0008] The structural formula of 2,2'-(3,3'-dichloro-1,1'-biphenyl-4,4'-diazo)bis[N-(2,4-dimethylphenyl)-3-oxo-butyramide] is as follows:

[0009]

[0010] The structural formula of 2,2'-[(3,3'-dichloro[1,1'-biphenyl]4,4"-diyl)bis(azo)]bis[N-(2-methylphenyl)]-3-oxobutanamide is as follows:

[0011]

[0012] The structural formula of N,N-dimethyl-4-(phenylazo)aniline is as follows:

[0013]

[0014] The present invention utilizes a blend of multiple light absorbers to better ensure the precision of ceramic slurries during the photocuring process. Specifically, azo compounds contain a large number of conjugated unsaturated bonds, and the azobenzene functional groups can induce trans-to-cis photoisomerization under ultraviolet light, allowing specific azobenzene functional groups to absorb ultraviolet rays of different wavelengths. The three azo compounds used in the present invention (2,,2'-(3,3'-dichloro-1,1'-biphenyl-4,4'-disazo)bis[N-(2,4-dimethylphenyl)-3-oxo-butyramide], N,N-dimethyl-4-(phenylazo)aniline and 2,2'-[(3,3'-dichloro[1,1'-biphenyl]4,4'-diyl)bis(azo)]bis[N-(2-methylphenyl)]-3-oxobutyramide) can absorb ultraviolet light in the range of 350 to 450 nm, including the wavelength of ultraviolet light used for photocuring 3D printing (365 to 405 nm). In addition, the three selected azo compounds can also be fully soluble in the photosensitive resin defined in the present invention. The reasonable ratio can effectively increase printing accuracy and greatly improve the dimensional quality of the molding core.

[0015] In some embodiments, the mass ratio of 2'-(3,3'-dichloro-1,1'-biphenyl-4,4'-diazo)bis[N-(2,4-dimethylphenyl)-3-oxo-butyramide], N,N-dimethyl-4-(phenylazo)aniline and 2,2'-[(3,3'-dichloro[1,1'-biphenyl]4,4'-diyl)bis(azo)]bis[N-(2-methylphenyl)]-3-oxobutyramide is 2-6:1-3:1-2.

[0016] In some embodiments, the photosensitive resin is a mixture of 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, and bisphenol A epoxy acrylate.

[0017] The photosensitive resin of the present invention is composed of three bifunctional reactive diluents, namely 1,6-hexanediol diacrylate, bisphenol A epoxy acrylate and tripropylene glycol diacrylate, and one trifunctional reactive diluent, namely trimethylolpropane triacrylate. The bifunctional reactive diluent has a large volume shrinkage during curing due to its low molecular weight during the photocuring process. Adding an appropriate amount of the trifunctional reactive diluent can effectively reduce the volume shrinkage during curing and reduce ceramic core molding defects.

[0018] In some embodiments, the mass ratio of 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate and bisphenol A epoxy acrylate is 5-10:1-4:1-3:1-2.

[0019] In some embodiments, the photoinitiator is a mixture of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone, and ethyl 2,4,6-trimethylbenzoylphenylphosphonate.

[0020] The ultraviolet absorption wavelength of 2-hydroxy-2-methyl-1-phenyl-1-propanone is 260-370 nm, the ultraviolet absorption wavelength of 2-methyl-1-(4-methylthiophenyl)-2-morpholine-1-propanone is 330-385 nm, and ethyl 2,4,6-trimethylbenzoylphenylphosphonate has absorption peaks at 350-380 nm and 422 nm. Therefore, the use of a mixed photoinitiator can adapt to 3D printing equipment with different wavelengths, thereby expanding the application range of the present invention.

[0021] In some embodiments, in the photoinitiator, the mass ratio of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-methyl-1-(4-methylthiophenyl)-2-morpholine-1-propanone and ethyl 2,4,6-trimethylbenzoylphenylphosphonate is 1-2:1-5:3-5.

[0022] In some embodiments, the dispersant is selected from at least three of polyphosphate solution, modified polyurethane solution, phosphate ester, propylene glycol methyl ether acetate, butyl acetate and alkylbenzene; and / or, the anti-settling agent is selected from at least three of polyhydroxycarboxamide solution, modified urea solution, xylene, isobutanol and N-methylpyrrolidone.

[0023] The mixed dispersant employed in this invention ensures a more uniform distribution of silicon-based ceramic powder within the photosensitive resin, resulting in improved fluidity. The mixed anti-settling agent further supports the dispersant, creating a synergistic effect that effectively extends the lifespan of the silicon-based ceramic core slurry and ensures batch stability.

[0024] In some embodiments, the dispersant is composed of polyphosphate solution, phosphate and alkylbenzene in a mass ratio of 1-2:1-3:1-4.

[0025] In some embodiments, the anti-settling agent is composed of modified urea solution and xylene in a mass ratio of 1-2:1-4.

[0026] In a second aspect, the present invention provides a method for preparing the aforementioned light-cured silicon-based ceramic core slurry for investment casting, comprising: mixing and ball-milling the raw materials, and then vacuum degassing.

[0027] In some embodiments, the preparation method of the aforementioned photocurable silicon-based ceramic core slurry for investment casting includes: 1) placing fused quartz powder, alumina ceramic powder, zirconium silicate ceramic powder and a certain proportion of deionized water into a ball mill, and then performing vacuum ball milling; 2) sieving the ball-milled mixture and drying it to obtain a silicon-based ceramic core powder that is evenly mixed after drying; 3) mixing the remaining raw materials in proportion to obtain a photosensitive resin premix; 4) adding the silicon-based ceramic core powder from step 2) to the photosensitive resin premix from step 3) and ball milling for 6 hours; 5) taking out the ball-milled ceramic slurry and performing vacuum degassing to obtain the product.

[0028] In a third aspect, the present invention provides the use of the aforementioned light-cured silicon-based ceramic core slurry for investment casting in the preparation of complex silicon-based ceramic cores.

[0029] In a fourth aspect, the present invention provides a method for preparing a silicon-based ceramic core, comprising the steps of printing a blank using a ceramic 3D printing device, and further degreasing and sintering the blank to obtain a finished silicon-based ceramic core. The step of printing the blank comprises:

[0030] a. Set the slice thickness to 10-40 microns, the printing parameters to 10-30 seconds, and 20-35 mW / cm 2 , using the first silicon-based ceramic core slurry for printing; based on the total weight of the first silicon-based ceramic core slurry as 100 parts, it contains the following components: 70-85 parts of ceramic powder, 10-25 parts of photosensitive resin, 2-5 parts of photoinitiator, 1-5 parts of dispersant, 0.2-1.2 parts of anti-settling agent and 0.15-0.2 parts of light absorber.

[0031] b. Set the slice thickness to 40-80 microns, set the printing parameters to 5-25s, 25-35mW / cm 2 , using a second silicon-based ceramic core slurry for printing; based on the total weight of the second silicon-based ceramic core slurry as 100 parts, it contains the following components: 70-85 parts of ceramic powder, 10-25 parts of photosensitive resin, 2-5 parts of photoinitiator, 1-5 parts of dispersant, 0.2-1.2 parts of anti-settling agent and 0.1-0.15 parts of light absorber.

[0032] c. Set the slice thickness to 80-120 microns, the printing parameters to 5-20 seconds, and 25-35 mW / cm 2 , using a third silicon-based ceramic core slurry for printing; based on the total weight of the third silicon-based ceramic core slurry as 100 parts, it contains the following components: 70-85 parts of ceramic powder, 10-25 parts of photosensitive resin, 2-5 parts of photoinitiator, 1-5 parts of dispersant, 0.2-1.2 parts of anti-settling agent and 0.05-0.1 parts of light absorber.

[0033] d. Set the slice thickness to 120-200 microns, the printing parameters to 5-15 seconds, and 15-35 mW / cm 2 , using the fourth silicon-based ceramic core slurry for printing; based on the total weight of the fourth silicon-based ceramic core slurry as 100 parts, it contains the following components: 70-85 parts of ceramic powder, 10-25 parts of photosensitive resin, 2-5 parts of photoinitiator, 1-5 parts of dispersant, 0.2-1.2 parts of anti-settling agent and 0.01-0.05 parts of light absorber.

[0034] Combined with the slurry prepared in the above steps, the present invention also optimizes the exposure parameters and the light absorber content in the slurry to obtain the above-mentioned optimal printing method. Specifically, the coupling relationship between the light absorber content, exposure parameters and molding parameters is solved by using a method combining numbers and shapes. Figure 2 , and obtain the light absorber content and exposure parameters with the highest accuracy under different molding parameters.

[0035] Decoupling calculation formula and description

[0036]

[0037] Formula (1) represents the relationship between the cured thickness and the exposure energy, where: C d is the cured thickness; E d0 is the incident ultraviolet energy (incident energy dose), E d is the minimum UV energy that can initiate photopolymerization reaction, S d Sensitivity in the depth direction, A d is the attenuation factor of depth.

[0038]

[0039] Formula (2) is A in Formula 1 d Detailed expression of where: φ represents the volume content of particles, ε p and ε d are the molar extinction coefficients of the photoinitiator and light absorber in the ceramic slurry, η p and η d Respectively represent the molar concentrations of photoinitiator and light absorber in ceramic slurry, l sc It represents the scattering length of the entire slurry when particles scatter.

[0040]

[0041] Formula (3) expresses the relationship between curing accuracy and exposure energy, where: Sw is the curing sensitivity in the width direction, A w is the width attenuation factor, which also satisfies S w =1 / A w , E w0 Also expressed as incident energy, combined with Eq.2, under the same exposure conditions, it can be considered that E w0 =E d0 , E w It is the apparent critical energy at which over-curing occurs in the width direction.

[0042] C d =S t ×1.1(~1.35)×100%#(4)

[0043] Formula (4) expresses the relationship between slice thickness and solidification thickness, where:

[0044] C d is the solidified thickness; S t is the slice thickness.

[0045] From the above four formulas, it is not difficult to find that the curing thickness and curing accuracy are determined by the intensity of the UV light, and the slice thickness is determined by the printing process. Therefore, the slice thickness, the amount of light absorber added, and the exposure parameters are coupled.

[0046]

[0047] Formulas (5) to (7) respectively represent the relationship of integration and decoupling of Formulas 1, 3, and 4. Figure 1 is the solution obtained according to formula (7), S0~S4 represent the content of additives, the step size increases by 0.025wt.%, the amount of S0 added is 0, and the amount of S4 added is 0.1wt.%. Where a represents the partial enlargement of the curve when the slice thickness is 110~135 microns. Through the analysis of this curve, it can be found that the closer to the red line, the higher the curing accuracy and the higher the accuracy of the printed ceramic core. Since the S0 curve does not add light absorber, its slope is too large, indicating that fine structures cannot be printed. K wd Expressing the ratio of formula 1 and formula 3, corresponding to Figure 1 For example, when the curing thickness is 100μm, the curing thickness calculated by combining formula 4 should be 110~135μm. Figure 1 The red area of ​​110-135 μm is drawn as the optimal curing range. When the curve is close to the red dotted line, it means that the addition amount is optimal. At the same time, the intersection of the red dotted line and the blue line can be determined by combining formula 1 and Figure 2 The exposure parameters at this time can be deduced in reverse, and the light absorber content in formula (7) can be determined.

[0048] Figure 2 is the relationship between the amount of light absorber added and the curing depth, Figure 3 This is the relationship between the amount of light absorber added and the curing accuracy. Figure 4 These are the test results of the effects of different light absorber contents on the accuracy of the test piece.

[0049] The printing method of the silicon-based ceramic core provided by the present invention further improves the precision of the finished product by precisely controlling the light absorber content in the slurry and the printing parameters, providing technical support for more stable and industrialized preparation of silicon-based ceramic cores.

[0050] The beneficial effects of the present invention are:

[0051] This invention utilizes a powder compounded from fused quartz powder of specific particle size and purity, alumina ceramic powder, and zirconium silicate ceramic powder as the ceramic powder for the silicon-based ceramic core slurry, significantly improving the mechanical properties of the silicon-based ceramic core (room temperature flexural strength ≥15MPa, high-temperature strength ≥20MPa at 1500°C). By precisely controlling the weight ratio of this ceramic powder with a photosensitive resin, a photoinitiator, a dispersant, an anti-settling agent, and a light absorber, and by adjusting appropriate 3D printing parameters, the resulting silicon-based ceramic core exhibits high strength and precision, meeting practical application requirements.

[0052] The slurry provided by the present invention has a solid content of >70 vol% and a slurry viscosity of <10 Pa·s. It does not show obvious sedimentation after standing for 7 days and has the characteristics of high solid content, good fluidity and good stability. At the same time, the high solid content also significantly reduces the sintering shrinkage rate of the prepared light-cured silicon-based ceramic core, thereby improving the dimensional accuracy of the molded silicon-based ceramic core. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is the solution obtained by decoupling the number and shape;

[0054] Figure 2 is the relationship between the amount of light absorber added and the curing depth, where: a is the effect of the amount of light absorber added on the curing depth behavior of the slurry; b is the value of Sd calculated using formula 1 in a, and the fitting graph using formulas 2 and 6;

[0055] Figure 3 is the relationship between the amount of light absorber added and the curing accuracy, where: a is the effect of the amount of light absorber added on the curing accuracy behavior of the slurry; b is the value of Sd calculated using formula 1 in a, and the fitting graph using formulas 2 and 6;

[0056] Figure 4These are the test results of the effect of different light absorber contents on the accuracy of the test piece. The upper right corner shows the model diagram of the cube. The tighter the fit, the better the molding stability. The 1.1mm distance between the holes in the lattice structure indicates a higher molding accuracy. Among them: a is the model designed to verify the accuracy; b is the accuracy test diagram when the light absorber addition amount is 0; c is the accuracy test diagram when the light absorber addition amount is 0.025wt.%; d is the accuracy test diagram when the light absorber addition amount is 0.05wt.%; e is the accuracy test diagram when the light absorber addition amount is 0.1wt.%;

[0057] Figure 5 This is a picture of the high-precision silicon-based ceramic core sample prepared in Example 3. DETAILED DESCRIPTION

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0059] In the following examples, the dispersant is a polyphosphate solution, a phosphate ester, and an alkylbenzene in a mass ratio of 1.5:2:3, the anti-settling agent is a modified urea solution and xylene in a mass ratio of 1.5:2, and the light absorber is 2'-(3,3'-dichloro-1,1'-biphenyl-4,4'-disazo)bis[N-(2,4-dimethylphenyl)-3-oxo-butyramide], N,N-dimethyl-4-(phenylazo)aniline, and 2,2'-[(3,3'-dichloro[1,1'-biphenyl]4,4'-diyl)bis(azo)]bis[N-(2-methylphenyl)]-3-oxobutyramide in a mass ratio of 3:2:1.

[0060] Example 1

[0061] This embodiment provides a light-cured silicon-based ceramic core slurry for investment casting, and the preparation method is as follows:

[0062] 1) placing fused quartz powder, alumina ceramic powder, and zirconium silicate ceramic powder with a certain proportion of deionized water into a ball mill, followed by vacuum ball milling;

[0063] 2) sieving the ball-milled mixture and drying it to obtain a dried and uniformly mixed silicon-based ceramic core powder;

[0064] 3) mixing 1,6-hexanediol diacrylate (HDDA), tripropylene glycol diacrylate (TPGDA), trimethylolpropane triacrylate (TMPTA), a photoinitiator 2,4,6-trimethylbenzoylphenyl phosphonic acid ethyl ester (TPO-L), a dispersant, an anti-settling agent, and a light absorber to obtain a photosensitive resin premix;

[0065] 4) adding the silicon-based ceramic core powder from step 2) to the photosensitive resin premix from step 3) and ball milling for 6 hours;

[0066] 5) The ball-milled ceramic slurry is taken out and subjected to vacuum degassing treatment to obtain a light-cured silicon-based ceramic core slurry for investment casting that can be printed.

[0067] The amount of each component added to the slurry is as follows:

[0068]

[0069]

[0070] The slurry obtained in Example 1 was subjected to sedimentation experiments and viscosity tests. The results showed that the slurry did not show obvious sedimentation after standing for 7 days, indicating that the slurry had good stability. -1 The viscosity is 9.9 Pa·s, which has good fluidity.

[0071] Example 2

[0072] This embodiment provides a light-cured silicon-based ceramic core slurry for investment casting. The preparation method is the same as that of Example 1. The amounts of the components added to the slurry are as follows:

[0073]

[0074] The slurry obtained in Example 2 was subjected to sedimentation experiments and viscosity tests. The results showed that the slurry did not show obvious sedimentation after standing for 7 days, indicating that the slurry had good stability. -1 The viscosity is 9.1 Pa·s, which has good fluidity.

[0075] Example 3

[0076] This embodiment provides a method for preparing a silicon-based ceramic core sample, comprising the following steps:

[0077] 1. Parameter determination: Select the slice thickness as 100 μm, the slurry of Example 1 (light absorber content is 0.05), the exposure parameters as 5 s, 32 mW / cm 2 .

[0078] 2. Photocuring printing: inject the slurry of Example 1 into the printing material tank of the ceramic 3D printer and perform photocuring printing to obtain a green body;

[0079] 3. Degreasing and sintering: Degreasing and sintering the green body, after sintering to denseness, high-precision samples are obtained, such as Figure 5 shown.

[0080] After testing, the error of the molded sample is ≤1.5%, the room temperature bending strength is ≥15MPa, the high temperature strength at 1500℃ is ≥20MPa, the porosity is ≥24.1%, and the sintering shrinkage is <2.5%.

[0081] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

Claims

1. A light-cured silicon-based ceramic core slurry for investment casting, characterized in that: Based on 100 parts by weight of the silicon-based ceramic core slurry, the slurry comprises the following components: 70 to 85 parts by weight of ceramic powder, 10 to 25 parts by weight of photosensitive resin, 2 to 5 parts by weight of photoinitiator, 1 to 5 parts by weight of dispersant, 0.2 to 1.2 parts by weight of anti-settling agent, and 0.01 to 0.2 parts by weight of light absorber; The ceramic powder is composed of fused quartz powder, alumina ceramic powder and zirconium silicate ceramic powder in a weight ratio of 50-90:5-15:2-10; The particle size of the fused quartz powder is 2-30 μm, and the purity is ≥95 wt %; the particle size of the alumina ceramic powder is 20-40 μm, and the purity is ≥95 wt %; the particle size of the zirconium silicate ceramic powder is 20-50 μm, and the purity is ≥95 wt %.

2. The light-cured silicon-based ceramic core slurry for investment casting according to claim 1, characterized in that: The light absorber is a mixed azo compound.

3. The light-cured silicon-based ceramic core slurry for investment casting according to claim 1, characterized in that: The photosensitive resin is a mixture of 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate and bisphenol A epoxy acrylate.

4. The light-cured silicon-based ceramic core slurry for investment casting according to claim 1, characterized in that: The photoinitiator is a mixture of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-methyl-1-(4-methylthiophenyl)-2-morpholine-1-propanone and ethyl 2,4,6-trimethylbenzoylphenylphosphonate; and / or the dispersant is selected from at least three of a polyphosphate solution, a modified polyurethane solution, a phosphate ester, propylene glycol methyl ether acetate, butyl acetate or an alkylbenzene; and / or the anti-settling agent is selected from at least three of a polyhydroxycarboxamide solution, a modified urea solution, xylene, isobutanol or N-methylpyrrolidone.

5. A method for preparing the light-cured silicon-based ceramic core slurry for investment casting according to any one of claims 1 to 4, characterized in that: The preparation method comprises: mixing various raw materials and ball milling, followed by vacuum degassing.

6. Use of the light-cured silicon-based ceramic core slurry for investment casting according to any one of claims 1 to 4 in preparing complex silicon-based ceramic cores.

7. A method for preparing a silicon-based ceramic core, characterized in that: The preparation method comprises the steps of printing a blank using a ceramic 3D printing device, and further degreasing and sintering the blank to obtain a finished silicon-based ceramic core. The steps of printing the blank include setting the slice thickness to 10-40 microns, setting the printing parameters to 10-30s, 20-35mW / cm 2 , using a first silicon-based ceramic core slurry for printing; based on 100 parts by total weight of the first silicon-based ceramic core slurry, the slurry comprises the following components: 70-85 parts by weight of ceramic powder, 10-25 parts by weight of photosensitive resin, 2-5 parts by weight of photoinitiator, 1-5 parts by weight of dispersant, 0.2-1.2 parts by weight of anti-settling agent, and 0.15-0.2 parts by weight of light absorber; The ceramic powder is composed of fused quartz powder, alumina ceramic powder and zirconium silicate ceramic powder in a weight ratio of 50-90:5-15:2-10; The particle size of the fused quartz powder is 2-30 μm, and the purity is ≥95 wt %; the particle size of the alumina ceramic powder is 20-40 μm, and the purity is ≥95 wt %; the particle size of the zirconium silicate ceramic powder is 20-50 μm, and the purity is ≥95 wt %.

8. A method for preparing a silicon-based ceramic core, characterized in that: The preparation method comprises the steps of printing a blank using a ceramic 3D printing device, and further degreasing and sintering the blank to obtain a finished silicon-based ceramic core. The steps of printing the blank include setting the slice thickness to 40-80 microns, setting the printing parameters to 5-25s, 25-35mW / cm 2 , using a second silicon-based ceramic core slurry for printing; based on 100 parts by total weight of the second silicon-based ceramic core slurry, the slurry comprises the following components: 70-85 parts by weight of ceramic powder, 10-25 parts by weight of photosensitive resin, 2-5 parts by weight of photoinitiator, 1-5 parts by weight of dispersant, 0.2-1.2 parts by weight of anti-settling agent, and 0.1-0.15 parts by weight of light absorber; The ceramic powder is composed of fused quartz powder, alumina ceramic powder and zirconium silicate ceramic powder in a weight ratio of 50-90:5-15:2-10; The particle size of the fused quartz powder is 2-30 μm, and the purity is ≥95 wt %; the particle size of the alumina ceramic powder is 20-40 μm, and the purity is ≥95 wt %; the particle size of the zirconium silicate ceramic powder is 20-50 μm, and the purity is ≥95 wt %.

9. A method for preparing a silicon-based ceramic core, characterized in that: The preparation method comprises the steps of printing a blank using a ceramic 3D printing device, and further degreasing and sintering the blank to obtain a finished silicon-based ceramic core. The steps of printing the blank include setting the slice thickness to 80-120 microns, setting the printing parameters to 5-20s, 25-35mW / cm 2 , using a third silicon-based ceramic core slurry for printing; based on 100 parts by total weight of the third silicon-based ceramic core slurry, the slurry comprises the following components: 70-85 parts by weight of ceramic powder, 10-25 parts by weight of photosensitive resin, 2-5 parts by weight of photoinitiator, 1-5 parts by weight of dispersant, 0.2-1.2 parts by weight of anti-settling agent, and 0.05-0.1 parts by weight of light absorber; The ceramic powder is composed of fused quartz powder, alumina ceramic powder and zirconium silicate ceramic powder in a weight ratio of 50-90:5-15:2-10; The particle size of the fused quartz powder is 2-30 μm, and the purity is ≥95 wt %; the particle size of the alumina ceramic powder is 20-40 μm, and the purity is ≥95 wt %; the particle size of the zirconium silicate ceramic powder is 20-50 μm, and the purity is ≥95 wt %.

10. A method for preparing a silicon-based ceramic core, characterized in that: The preparation method comprises the steps of printing a blank using a ceramic 3D printing device, and further degreasing and sintering the blank to obtain a finished silicon-based ceramic core. The step of printing the blank includes: setting the slice thickness to 120-200 microns, setting the printing parameters to 5-15 seconds, 15-35 mW / cm2, and using a fourth silicon-based ceramic core slurry for printing; based on the total weight of the fourth silicon-based ceramic core slurry being 100 parts, the slurry comprises the following components: 70-85 parts of ceramic powder, 10-25 parts of photosensitive resin, 2-5 parts of photoinitiator, 1-5 parts of dispersant, 0.2-1.2 parts of anti-settling agent, and 0.01-0.05 parts of light absorber; The ceramic powder is composed of fused quartz powder, alumina ceramic powder and zirconium silicate ceramic powder in a weight ratio of 50-90:5-15:2-10; The particle size of the fused quartz powder is 2-30 μm, and the purity is ≥95 wt %; the particle size of the alumina ceramic powder is 20-40 μm, and the purity is ≥95 wt %; the particle size of the zirconium silicate ceramic powder is 20-50 μm, and the purity is ≥95 wt %.

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