A ceramic component infiltration agent, its preparation method and application

Abstract

This invention discloses a melting agent for ceramic components and its preparation method, comprising: uniformly mixing silica-containing powder, anti-adhesion ceramic powder, organic binder, and a first dispersion medium to obtain a silica-ceramic liquid; solidifying and spheroidizing the obtained silica-ceramic liquid to obtain silica-ceramic spheres; and uniformly mixing the obtained silica-ceramic spheres with a second dispersion medium, a dispersant, and an anti-settling agent to obtain a slurry-type melting agent. In this method, the uniform mixing of silica-containing powder and anti-adhesion ceramic powder isolates the powder particles in the silica-containing powder, making the powder particles dispersed and less prone to aggregation. This avoids the phenomenon of silica accumulation on the component surface due to the aggregation of silica liquid during the melting process. The preparation method of the melting agent for ceramic components proposed in this invention is simple to operate, has high preparation efficiency, and is suitable for industrial production.

Description

Technical Field

[0001] This invention belongs to the field of ceramic matrix composite materials technology, specifically to a melting agent for ceramic components, its preparation method, and its application. Background Technology

[0002] SiC ceramic matrix composites have wide applications in chemical, aerospace and other fields due to their low density, high modulus, low thermal expansion, and high corrosion resistance. Reactive infiltration (RMI) is a highly efficient process for preparing SiC ceramic matrix composites, offering advantages such as high production efficiency, low porosity of SiC components, and near-net-shape forming. Specifically, this process involves vacuum impregnating, melting, and reacting a porous carbon preform with elemental silicon or silicon alloys in a high-temperature furnace to obtain ceramic components. However, RMI is only suitable for producing ceramic components with simple internal structures. For ceramic components with complex internal structures, silicon and its alloys tend to accumulate on the surface of the component after the RMI process, leading to silicon buildup. This silicon buildup can block some internal structures of the ceramic component, requiring mechanical treatment. SiC ceramic matrix composites have high hardness, which makes them difficult to process, time-consuming, and labor-intensive. At the same time, for ceramic components with complex internal structures, the silicon deposits in the complex internal structures are almost impossible to remove mechanically.

[0003] The patent document with publication number CN104045348B proposes to use boron nitride (BN) mixed with silicon alloy and pressed to obtain a melt infiltrate blank. By taking advantage of the high melting point of BN and its effect of not wetting silicon, the phenomenon of silicon surface after melt infiltration of porous carbon blank is effectively solved.

[0004] Patent document CN109748595B describes a process of mixing ceramic microparticles (Al2O3, ZrO2, ZrC, etc.) with silicon powder. These microparticles have a melting point 50°C higher than that of Si and do not react with carbon or Si. This results in a powdered mixed infiltration agent. By utilizing the barrier effect of the ceramic microparticles in the mixed infiltration agent, the accumulation of unreacted Si on the surface of the component is limited, thereby achieving the net-size forming of the component.

[0005] While the above two solutions solve the problem of silicon or silicon alloy deposits on the surface of ceramic components after the RMI process, the infiltrating agent in these solutions is in powder or block form. During the melting and infiltration process of 3D printed ceramic components, the powder or solid is not easy to be loaded into the ceramic components; and once loaded, it can easily cause some damage to the internal structure of the ceramic components, thus limiting its application. Summary of the Invention

[0006] To address the problem that in existing ceramic component infiltration processes using molten silicon blocks, the molten silicon from the silicon block can accumulate on the surface of the ceramic component, this invention provides a ceramic component infiltration agent, its preparation method, and its application.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This invention discloses a method for preparing a fluxing agent for ceramic components, comprising the following steps:

[0009] S1, silicon-containing powder, anti-adhesion ceramic powder, organic binder and first dispersion medium are uniformly mixed to obtain silicon-ceramic liquid;

[0010] S2, the silica-ceramic liquid obtained in S1 is solidified and spheroidized to obtain silica-ceramic spheres;

[0011] S3, the silica-ceramic spheres obtained in S2 are uniformly mixed with the second dispersion medium, dispersant, and anti-settling agent to obtain a slurry-type melting and infiltrating agent.

[0012] Preferably, in step S1, the silicon-containing powder and the anti-adhesion ceramic powder are mixed in a mass ratio of 1:0.1 to 2.

[0013] The mass of the organic adhesive is 5% to 20% of the total mass of the silicon-containing powder and the anti-adhesion ceramic powder;

[0014] The particle size range of the silicon-containing powder and the anti-adhesion ceramic powder is 0.1–50 μm.

[0015] Preferably, the silicon-containing powder is one or both of silicon powder and silicon alloy powder;

[0016] The silicon alloy powder is one or more of Si-Zr alloy powder, Hf-Si-B alloy powder, or Hf-Zr-Si-Ta alloy powder.

[0017] Preferably, the anti-adhesion ceramic powder is one or more of boron nitride powder, SiC ceramic powder, ZrO2 ceramic powder, ZrC ceramic powder, and ZrB2 ceramic powder.

[0018] Preferably, the organic adhesive is one or both of thermosetting adhesives and thermoplastic adhesives;

[0019] The thermosetting adhesive includes one or more of epoxy resin, phenolic resin, benzoxazine resin, and bismaleimide resin.

[0020] The thermoplastic adhesive includes one or more of polyvinylpyrrolidone resin, polyvinyl butyral resin, polyvinyl alcohol resin, and PA6 nylon.

[0021] Preferably, the curing process in S2 includes:

[0022] The silicon ceramic liquid obtained in S1 is dried by casting at a curing temperature to obtain a silicon ceramic solid.

[0023] The silicon ceramic solid was mechanically crushed and spheroidized sequentially to obtain the silicon ceramic spheres.

[0024] Preferably, the first dispersion medium is one or more of water, ethanol, acetone, tetrahydrofuran, and N-methylpyrrolidone, which can dissolve the organic adhesive;

[0025] The mass of the first dispersion medium is 1 to 5 times the total mass of the silicon-containing powder, the anti-adhesion ceramic powder, and the organic binder;

[0026] The second dispersion medium is one or more of water, ethanol, acetone, tetrahydrofuran, and N-methylpyrrolidone, which do not dissolve the organic adhesive.

[0027] The mass ratio of the second dispersion medium to the silica-ceramic spheres is 1:(0.5-2).

[0028] Preferably, the anti-settling agent is one or more of bentonite, layered silicate, and fumed silica.

[0029] The mass ratio of the anti-settling agent to the silica ceramic spheres is 1:0.1-2Wt%.

[0030] The dispersant is one or more selected from sodium phosphate, sodium silicate, sodium carbonate, sodium citrate, and sodium polyacrylate;

[0031] The mass ratio of the dispersant to the silica spheres is 1:0.1-5 wt%.

[0032] The present invention also discloses a ceramic component infiltration agent, which is prepared by the above-described method for preparing a ceramic component infiltration agent.

[0033] The present invention also discloses the application of a ceramic component infiltration agent in the infiltration of porous ceramic components.

[0034] Compared with the prior art, the present invention has the following beneficial technical effects:

[0035] This invention discloses a method for preparing a melt infiltration agent for ceramic components. In this method, silicon-containing powder and anti-adhesion ceramic powder are uniformly mixed to isolate the powder particles in the silicon-containing powder, thus dispersing the particles and preventing them from agglomerating. This avoids silicon buildup on the component surface due to the aggregation of silicon liquid during the infiltration process. The use of an organic binder in this invention increases the strength and stability of the silicon-ceramic spheres during subsequent preparation, ensuring the anti-silicon buildup effect of the melt infiltration agent. The method for preparing the melt infiltration agent for ceramic components proposed in this invention is simple to operate, highly efficient, and suitable for industrial production.

[0036] Furthermore, the silicon-containing powder and the anti-adhesion ceramic powder are mixed in a mass ratio of 1:0.1 to 2. This mixing ratio ensures that the anti-adhesion ceramic powder can fully disperse the powder particles in the silicon-containing powder. At the same time, it avoids the situation where too little anti-adhesion ceramic powder will not be effective in preventing silicon accumulation, while too much anti-adhesion ceramic powder will affect the melting and infiltration effect of the final component due to insufficient silicon content. The mass of the organic binder is 0.05 to 0.2 times the total mass of the silicon-containing powder and the anti-adhesion ceramic powder. This mass of organic binder can improve the strength of the prepared silicon ceramic spheres. It avoids the situation where too little organic binder will make the silicon ceramic spheres easy to break and affect their use. At the same time, if there is too much organic binder, it will consume excessive silicon during the RMI process, affecting the melting and infiltration effect of the slurry solvent on the ceramic component, resulting in insufficient density of the ceramic component.

[0037] Furthermore, in this invention, the first dispersion medium is one or more of water, ethanol, acetone, tetrahydrofuran, and N-methylpyrrolidone, which can dissolve the organic binder; and the mass of the first dispersion medium is 1 to 5 times the total mass of the silicon-containing powder, the anti-adhesion ceramic powder, and the organic binder. This mass of the first dispersion medium helps to uniformly mix the silicon-containing powder, the anti-adhesion ceramic powder, and the organic binder, thereby improving the preparation efficiency. The second dispersion medium is one or more of water, ethanol, acetone, tetrahydrofuran, and N-methylpyrrolidone, which do not dissolve the organic binder. The mass ratio of the second dispersion medium to the silicon ceramic spheres is 1:(0.5 to 2). This mass of the second dispersion medium ensures the fluidity of the slurry-type infiltrator and avoids excessive dosage, which could affect the densification of the ceramic component by the infiltrator.

[0038] The present invention also discloses a solvent for ceramic components. As it is a slurry, it has strong fluidity. The solvent contains anti-adhesion ceramic powder, organic binder, and a second dispersion medium, which makes the silicon in the solvent uniformly dispersed. During the melting and infiltration process, the silicon liquid will not accumulate excessively, thereby eliminating the phenomenon of silicon accumulation on the surface of the ceramic component during the melting and infiltration process, and improving the quality and aesthetics of the ceramic component.

[0039] This invention also discloses the application of a melting agent for ceramic components. This melting agent is used for the melt infiltration of ceramic components, which can be processed using 3D printing SiC ceramic forming processes and mold casting processes. The 3D printing SiC ceramic forming processes include selective laser sintering, photopolymerization, and spray forming. Ceramic components treated with this melting agent do not exhibit silicon buildup on their surfaces, resulting in high aesthetic appeal and eliminating the need for subsequent silicon buildup treatment, thus saving on processing costs. Simultaneously, it avoids the blockage of upper structures in the ceramic component, improving its quality. Attached Figure Description

[0040] Figure 1 This is an image showing the appearance of silicon deposits on a ceramic component after it has been melted and infiltrated by a silicon block in the prior art.

[0041] Figure 2 This is a schematic diagram of the preparation method of a melting agent for ceramic components proposed in this invention;

[0042] Figure 3 This is a schematic diagram of the process by which the solvent infiltrates ceramic components according to the present invention;

[0043] Figure 4 This invention provides a viscosity data spectrum of a fluxing agent for ceramic components.

[0044] Figure 5 This invention relates to a SiC ceramic matrix composite structural component prepared by an RMI process using a ceramic component infiltration agent. Detailed Implementation

[0045] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0049] See Figure 2 This invention discloses a method for preparing a melting agent for ceramic components, which specifically includes the following steps:

[0050] S1, silicon-containing powder, anti-adhesion ceramic powder, organic binder and first dispersion medium are uniformly mixed to obtain silicon-ceramic liquid;

[0051] Specifically, anti-adhesion ceramic powder with a particle size range of 0.1–50 μm and silicon-containing powder with a particle size range of 0.1–50 μm are weighed, with the silicon-containing powder and anti-adhesion ceramic powder in a mass ratio of 1:0.1–2. An organic binder with a mass of 0.05–0.2 times the total mass of the silicon-containing powder and the anti-adhesion ceramic powder is weighed, and a first dispersion medium with a mass of 1–5 times the total mass of the silicon-containing powder, the anti-adhesion ceramic powder, and the organic binder is weighed. The first dispersion medium, the organic binder, the silicon-containing powder, and the anti-adhesion ceramic powder are mixed and stirred evenly to obtain a silica-ceramic liquid.

[0052] Furthermore, the silicon-containing powder is one or both of silicon powder and silicon alloy powder; the silicon alloy powder is one or more of Si-Zr alloy powder, Hf-Si-B alloy powder, or Hf-Zr-Si-Ta alloy powder.

[0053] The Si-Zr alloy powder is a binary alloy powder containing Si and Zr elements such as SiZr10; the Hf-Si-B alloy powder is a ternary alloy powder containing Hf, Si, and B elements such as Hf10Si2B; and the Hf-Zr-Si-Ta alloy powder is a quaternary alloy powder containing Hf, Zr, Si, and Ta elements such as 40Hf31Zr10Si15Ta4.

[0054] Furthermore, the anti-adhesion ceramic powder is one or more of boron nitride powder, SiC ceramic powder, ZrO2 ceramic powder, ZrC ceramic powder, and ZrB2 ceramic powder; the melting point of boron nitride powder is greater than that of silicon and it does not wet silicon; the melting points of SiC ceramic powder, ZrO2 ceramic powder, ZrC ceramic powder, and ZrB2 ceramic powder are greater than those of silicon.

[0055] Furthermore, the organic adhesive is one or both of thermosetting adhesives and thermoplastic adhesives;

[0056] Thermosetting adhesives include one or more of epoxy resin, phenolic resin, benzoxazine resin, and bismaleimide resin.

[0057] Thermoplastic adhesives include one or more of polyvinylpyrrolidone resin (PVP), polyvinyl butyral resin (PVB), polyvinyl alcohol resin (PVA), and PA6 nylon;

[0058] The first dispersion medium is one or more of water, ethanol, acetone, tetrahydrofuran, and N-methylpyrrolidone, which can dissolve organic adhesives.

[0059] S2, the silica-ceramic liquid obtained in S1 is solidified and spheroidized to obtain silica-ceramic spheres;

[0060] Specifically, the silica-ceramic liquid obtained in S1 is placed into a casting dryer, a curing temperature is set, and casting and drying are carried out at the curing temperature to obtain silica-ceramic solid;

[0061] The solid silica ceramic is placed in a rotary vane pulverizer for mechanical pulverization, and then the pulverized material is put into an airflow vortex pulverizer for granulation to obtain silica ceramic spheres.

[0062] Preferably, the curing temperature is set by comparing the boiling point of the first dispersion medium with the curing temperature of the thermosetting adhesive, or the boiling point of the first dispersion medium with the softening temperature of the thermoplastic adhesive, selecting the highest temperature, and increasing it by 10-30°C to obtain the curing temperature of the silica-ceramic liquid.

[0063] S3, the silica-ceramic spheres obtained in S2 are uniformly mixed with the second dispersion medium, dispersant, and anti-settling agent to obtain a slurry-type melting and infiltrating agent.

[0064] Specifically, a second dispersion medium is selected and weighed, with a mass ratio of the second dispersion medium to the silica ceramic spheres of 1:(0.5-2). 0.1-5 wt% of dispersant and 0.1-2 wt% of anti-settling agent are weighed. All the weighed materials are mixed and stirred until they are homogeneous to obtain a slurry-type melting and penetrating agent.

[0065] Preferably, the second dispersion medium is one or more of water, ethanol, acetone, tetrahydrofuran, and N-methylpyrrolidone, which do not dissolve organic adhesives; the dispersant is one or more of sodium phosphate, sodium silicate, sodium carbonate, sodium citrate, and sodium polyacrylate, which are inorganic salts; and the anti-settling agent is one or more of bentonite, layered silicate, and fumed silica.

[0066] The preparation method described above will be further explained below with reference to the embodiments:

[0067] Example 1

[0068] S1. Select BN powder with 0.1μm anti-adhesion ceramic powder and silicon powder with 50μm silicon powder. Weigh the 50μm silicon powder and 0.1μm BN powder in a mass ratio of 1:0.1. Then weigh polyvinylpyrrolidone resin with a mass of 20% of the total mass of silicon powder and BN powder and water with a mass of 1 times the total mass of silicon powder, BN powder and polyvinylpyrrolidone resin. Stir all materials evenly to obtain silicon ceramic liquid.

[0069] S2, the silica-ceramic liquid obtained in S1 is placed in a casting dryer, the curing temperature is set to 110℃, and the silica-ceramic solid is obtained by casting and drying at 110℃.

[0070] The solid silica ceramic is placed in a rotary vane pulverizer for mechanical pulverization, and then the pulverized material is put into an airflow vortex pulverizer for granulation to obtain silica ceramic spheres.

[0071] S3, acetone is selected as the second dispersion medium. Acetone and silica spheres are mixed at a mass ratio of 1:0.5 and stirred evenly to obtain a silica sphere dispersion. Sodium phosphate with a mass of 2 wt% of the silica spheres and fumed silica with a mass of 0.1 wt% of the silica spheres are weighed and added to the silica sphere dispersion and stirred evenly to obtain a slurry-type melting and infiltrating agent.

[0072] Example 2

[0073] S1. Select BN powder with 50μm anti-adhesion ceramic powder and silicon powder with 0.1μm silicon powder. Weigh the 0.1μm silicon powder and the 50μm BN powder in a mass ratio of 1:2. Then weigh phenolic resin at 5% of the total mass of silicon powder and BN powder and acetone at 1 times the total mass of silicon powder, BN powder and phenolic resin. Stir all materials evenly to obtain silicon ceramic liquid.

[0074] S2, the silica liquid obtained in S1 is placed in a casting dryer, the curing temperature is set to 180℃, and the silica solid is obtained by casting and drying at 180℃.

[0075] The solid silica ceramic is placed in a rotary vane pulverizer for mechanical pulverization, and then the pulverized material is put into an airflow vortex pulverizer for granulation to obtain silica ceramic spheres.

[0076] S3, the second dispersion medium is water. Water and silica spheres are mixed at a mass ratio of 1:2 and stirred evenly to obtain a silica sphere dispersion. Sodium citrate with a mass of 2 wt% of the silica spheres and bentonite with a mass of 0.1 wt% of the silica spheres are weighed. The weighed sodium citrate and bentonite are added to the silica sphere dispersion and stirred evenly to obtain a slurry-type infiltrator.

[0077] Example 3

[0078] S1, select ZrC powder with 0.1μm anti-adhesion ceramic powder and Hf10Si2B powder with 50μm silicon-containing powder. Weigh the 50μm Hf10Si2B powder and the 0.1μm ZrC powder in a mass ratio of 1:0.5. Then weigh the mass of Hf10Si2B powder and ZrC powder. 10 Five parts of polyvinylpyrrolidone resin (5% of the total mass of Si2B powder and ZrC powder) and one part of water (1 times the total mass of Hf10Si2B powder, ZrC powder and polyvinylpyrrolidone resin) were added to the polyvinylpyrrolidone resin and stirred until uniform to obtain a mixture. Then, water was added to the uniformly mixed mixture and stirred until uniform to obtain a silica ceramic liquid.

[0079] S2, the silica-ceramic liquid obtained in S1 is placed in a casting dryer, the curing temperature is set to 110℃, and the silica-ceramic solid is obtained by casting and drying at 110℃.

[0080] The solid silica ceramic is placed in a rotary vane pulverizer for mechanical pulverization, and then the pulverized material is put into an airflow vortex pulverizer for granulation to obtain silica ceramic spheres.

[0081] S3, select acetone as the second dispersion medium, mix acetone and silica spheres at a mass ratio of 1:0.5, stir evenly to obtain silica sphere dispersion, weigh out 1 wt% of the mass of silica spheres of sodium phosphate and 2 wt% of the mass of silica spheres of fumed silica, add the weighed sodium phosphate and fumed silica to the silica sphere dispersion and stir evenly to obtain slurry-type melting and infiltrating agent;

[0082] Example 4

[0083] S1. Select ZrC powder with 50μm anti-adhesion ceramic powder and 40Hf31Zr10Si15Ta4 powder with 50μm silicon-containing powder. Weigh the 50μm 40Hf31Zr10Si15Ta4 powder and 50μm ZrC powder in a 1:1 mass ratio. Then weigh polyvinylpyrrolidone resin at 5% of the total mass of 40Hf31Zr10Si15Ta4 powder and ZrC powder, and weigh water at 1 times the total mass of 40Hf31Zr10Si15Ta4 powder, ZrC powder and polyvinylpyrrolidone resin. Add the mixed powder to the polyvinylpyrrolidone resin and stir to mix evenly to obtain a mixed liquid. Then add water to the evenly mixed liquid and stir evenly to obtain a silica ceramic liquid.

[0084] S2, the silica-ceramic liquid obtained in S1 is placed in a casting dryer, the curing temperature is set to 110℃, and the silica-ceramic solid is obtained by casting and drying at 110℃.

[0085] The solid silica ceramic is placed in a rotary vane pulverizer for mechanical pulverization, and then the pulverized material is put into an airflow vortex pulverizer for granulation to obtain silica ceramic spheres.

[0086] S3, the second dispersion medium is acetone. Acetone and silica spheres are mixed at a mass ratio of 1:0.5 and stirred evenly to obtain a silica sphere dispersion. 2 wt% of sodium phosphate and 2 wt% of fumed silica are weighed and added to the silica sphere dispersion. The slurry-type melting agent is obtained.

[0087] Example 5

[0088] S1. Select ZrB2 powder with 0.1μm anti-adhesion ceramic powder and ZrB2 powder with 50μm silicon powder. Weigh the 50μm silicon powder and 0.1μm ZrB2 powder in a mass ratio of 1:0.1. Then weigh benzoxazine resin, which is 5% of the total mass of silicon powder and ZrB2 powder, and tetrahydrofuran, which is 1 times the total mass of silicon powder, ZrB2 powder and benzoxazine resin. Add the mixed powder to the benzoxazine resin and stir to mix evenly to obtain a mixed liquid. Then add the tetrahydrofuran to the evenly mixed liquid and stir evenly to obtain a silicon ceramic liquid.

[0089] S2, the silica-ceramic liquid obtained in S1 is placed in a casting dryer, the curing temperature is set to 200℃, and the silica-ceramic solid is obtained by casting and drying at 200℃.

[0090] The solid silica ceramic is placed in a rotary vane pulverizer for mechanical pulverization, and then the pulverized material is put into an airflow vortex pulverizer for granulation to obtain silica ceramic spheres.

[0091] S3, the second dispersion medium is acetone. Acetone and silica spheres are mixed at a mass ratio of 1:0.5 and stirred evenly to obtain a silica sphere dispersion. 2 wt% of sodium phosphate and 0.1 wt% of fumed silica are weighed and added to the silica sphere dispersion. The mixture is stirred evenly to obtain a slurry-type melting and infiltration agent.

[0092] The slurry-type solvent prepared by the above method has strong fluidity, stable structure, and stable adhesive properties. (See above.) Figure 4 The figure shows the viscosity data of the melt infiltration agent. It can be seen from the figure that as the shear rate increases, the viscosity of the slurry-type melt infiltration agent decreases. When it decreases to 10,000 cP, it stops decreasing. At this viscosity, the material has good fluidity and viscosity, which prevents silicon accumulation on the surface of the ceramic component after melt infiltration treatment, thus improving the production efficiency of ceramic components.

[0093] See Figure 3 The present invention also discloses the application of a melting agent for ceramic components, which is used for melting and penetrating ceramic components. The specific application steps include the following:

[0094] The 3D printed resin-based structural parts are placed in a carbonization furnace, and the temperature of the carbonization furnace is set to 1000℃ to perform high-temperature carbonization treatment to obtain porous C / C structural parts.

[0095] The porous C / C structure was infused with a slurry-type infiltration agent and then embedded. After drying at a set temperature for 6 hours, it was transferred to a vacuum infiltration furnace for RMI process. The temperature of the vacuum infiltration furnace was set at 1450℃ and the pressure at 0.01Pa. After infiltration for 0.5 hours, a 3D printed ceramic component with a complex and fine structure was obtained.

[0096] The ceramic components treated with the above-mentioned slurry-type solvent have clear surfaces, such as... Figure 5 As shown in the figure, the surface of the ceramic component is smooth, and there is no silicon buildup on the 0.5mm through-holes. This ensures the unobstructed flow of the through-hole structure, avoids silicon blockage, guarantees the quality of the ceramic component, and improves production efficiency.

[0097] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0098] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for preparing a fluxing agent for ceramic components, characterized in that, Includes the following steps: S1, silicon-containing powder, anti-adhesion ceramic powder, organic binder and first dispersion medium are uniformly mixed to obtain silicon-ceramic liquid; The silicon-containing powder and the anti-adhesion ceramic powder are mixed in a mass ratio of 1:0.1~2. The mass of the organic adhesive is 5% to 20% of the total mass of the silicon-containing powder and the anti-adhesion ceramic powder; The particle size range of the silicon-containing powder and the anti-adhesion ceramic powder is 0.1~50μm; S2, the silica-ceramic liquid obtained in S1 is solidified and spheroidized to obtain silica-ceramic spheres; wherein, the solidification process includes: The silicon ceramic liquid obtained in S1 is dried by casting at a curing temperature to obtain a silicon ceramic solid. The silicon ceramic solid was mechanically crushed and spheroidized sequentially to obtain the silicon ceramic spheres; S3, uniformly mix the silica-ceramic spheres obtained in S2 with the second dispersion medium, dispersant, and anti-settling agent to obtain a slurry-type melting and penetrating agent; The anti-adhesion ceramic powder is one or more of boron nitride powder, SiC ceramic powder, ZrO2 ceramic powder, ZrC ceramic powder, and ZrB2 ceramic powder.

2. The method for preparing a fluxing agent for ceramic components according to claim 1, characterized in that, The silicon-containing powder is one or both of silicon powder and silicon alloy powder; The silicon alloy powder is one or more of Si-Zr alloy powder, Hf-Si-B alloy powder, or Hf-Zr-Si-Ta alloy powder.

3. The method for preparing a fluxing agent for ceramic components according to claim 1, characterized in that, The organic adhesive is one or both of thermosetting adhesives and thermoplastic adhesives; The thermosetting adhesive includes one or more of epoxy resin, phenolic resin, benzoxazine resin, and bismaleimide resin. The thermoplastic adhesive includes one or more of polyvinylpyrrolidone resin, polyvinyl butyral resin, polyvinyl alcohol resin, and PA6 nylon.

4. The method for preparing a fluxing agent for ceramic components according to claim 1, characterized in that, The first dispersion medium is one or more of water, ethanol, acetone, tetrahydrofuran, and N-methylpyrrolidone, which can dissolve the organic adhesive. The mass of the first dispersion medium is 1 to 5 times the total mass of the silicon-containing powder, the anti-adhesion ceramic powder, and the organic binder; The second dispersion medium is one or more of water, ethanol, acetone, tetrahydrofuran, and N-methylpyrrolidone, which do not dissolve the organic adhesive. The mass ratio of the second dispersion medium to the silica-ceramic spheres is 1:(0.5~2).

5. The method for preparing a fluxing agent for ceramic components according to claim 1, characterized in that, The anti-settling agent is one or more of bentonite, layered silicate and fumed silica; The dispersant is one or more of sodium phosphate, sodium silicate, sodium carbonate, sodium citrate, and sodium polyacrylate.

6. A fluxing agent for ceramic components, characterized in that, It is prepared by the method for preparing a ceramic component infiltration agent according to any one of claims 1 to 5.

7. The application of the ceramic component infiltration agent as described in claim 6 in the infiltration of porous ceramic components.

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