Nano calcium titanate binder as well as in-situ generation method and application thereof
By introducing soluble Ca/Ti precursors into the binder, nano-CaTiO3 is generated in situ, solving the sintering problem of yttrium oxide ceramic cores and realizing low-temperature forming and cost reduction of high-strength ceramic cores.
Patent Information
- Application Number
- CN202511753238.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-02-10
AI Technical Summary
When preparing yttrium oxide ceramic cores using existing binder jet printing, yttrium oxide is difficult to sinter densely, resulting in low ceramic core strength. Furthermore, existing sintering aids can cause problems such as material flowability, uneven distribution, and nozzle clogging.
Soluble Ca/Ti precursors are introduced into the binder, and nano-CaTiO3 is generated in situ through binder spray forming, curing, debinding and densification sintering, which promotes the densification of yttrium oxide ceramics.
This method enables the forming of yttrium oxide ceramics at lower temperatures, improving the strength and density of the ceramic core, avoiding uneven distribution of nanoparticles and nozzle clogging, and reducing manufacturing costs.
Smart Images
Figure CN121494581A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of ceramic core for reactive metal precision casting, and particularly relates to a nano calcium titanate binder and an in-situ generation method and application thereof. BACKGROUND
[0002] The binder spraying has the advantages of no need of heat source, high efficiency and low cost, and is suitable for rapid preparation of complex hollow ceramic cores; yttria has high-temperature stability and chemical affinity to titanium, and is an optimal material for ceramic cores for titanium alloy casting. However, the sintering temperature of yttria is high, and the grain boundary diffusion is slow, which often leads to delayed pore closure and difficulty in densification. As an interface phase / sintering aid medium, CaTiO3 can reduce the interface energy at the grain boundary, improve the diffusion rate, and capture impurities to form a transient liquid phase, thereby significantly promoting densification.
[0003] In the binder spraying printing process, the common way to introduce a sintering aid is to dope a sintering aid powder in the original powder and then print; or to perform vacuum impregnation post-processing after printing, so as to impregnate the sintering aid phase into the voids of the printed green body through a solution; or to directly introduce a nano sintering aid phase into the binder, but these three methods have obvious shortcomings: 1. Directly doping a sintering aid phase in the original printing powder can easily affect the flowability of the material, and in additive manufacturing, powder recycling is very critical, and doping a second phase contaminates the original powder, and the raw material utilization rate is significantly reduced; 2. Vacuum impregnation of the sintering aid phase in the printed green body is related to factors such as impregnation process and time, solution concentration, and vacuum degree, and is complicated to control, and in vacuum impregnation, the sintering aid phase is impregnated from the outside to the inside, which can easily cause uneven distribution of the sintering aid phase, and deformation of the sintered ceramic part; 3. Directly introducing a nano sintering aid phase into the binder, the nano phase is difficult to uniformly distribute in the solution, which can easily cause the binder to settle, and the unstable nano phase can easily block the nozzle during the printing process, reducing the service life of the nozzle, and if the nano phase is not uniform in the binder, it will also be uneven when sprayed on the yttria powder. SUMMARY
[0004] In view of the problems that yttria is difficult to sinter and the ceramic core has low strength in the preparation of yttria ceramic cores by the binder spraying printing, the application provides a nano calcium titanate binder and an in-situ generation method and application thereof, so as to realize the forming of high-performance yttria ceramic at a lower temperature and reduce the manufacturing cost of the ceramic core.
[0005] The application introduces soluble Ca / Ti precursors into the binder, formulates a binder suitable for inkjet printing, and realizes in-situ generation of nano-CaTiO3 at the yttria grain boundaries through a continuous process of binder jetting, curing, debinding, and densification sintering, thereby achieving sintering promotion and performance improvement. The introduction of soluble Ca / Ti precursors into the binder avoids the impact of nano-powder on the stability of the binder, and the binder can be uniformly jetted on the yttria powder, and finally in-situ generation of uniformly distributed nano-CaTiO3 during the sintering process.
[0006] To solve the above technical problems, the application adopts the following technical solutions:
[0007] An in-situ generation method of nano-calcium titanate binder, comprising the following steps:
[0008] Step 1, configuring a binder base solution from polyvinyl alcohol, propylene glycol, glycerol, and deionized water;
[0009] Step 2, adding complexing agents, wetting agents, and defoaming agents to the binder base solution to obtain a binder mixture;
[0010] Step 3, adding metal precursors to the binder mixture to obtain a binder precursor;
[0011] Step 4, pH correction of the binder precursor, maintaining the pH at 7.0-7.5;
[0012] Step 5, then constant volume, filtration, and defoaming to obtain a nano-calcium titanate binder.
[0013] Further, the step 1, configuring a binder base solution from polyvinyl alcohol, propylene glycol, glycerol, and deionized water, specifically:
[0014] In the deionized water, sequentially add propylene glycol and glycerol, mix uniformly under magnetic stirring; then slowly sprinkle polyvinyl alcohol (PVA, molecular weight 18000), then heat in a water bath until the solution is clear and particle-free, and then add deionized water after cooling, maintaining the overall base solution pH at 6.8-7.2 and the surface tension at 25-35 mN / m.
[0015] Further, the mass ratio of propylene glycol, glycerol, and polyvinyl alcohol is 3-3.2:1-1.2:1.
[0016] Further, the temperature of the water bath heating is 45-60℃, and the heating time is 20-40 min; the speed of the magnetic stirring is 300-400 rpm;
[0017] Further, the step 2, adding complexing agent, wetting agent and defoaming agent in the binder base fluid to obtain a mixture, specifically: first in the binder base fluid, under magnetic stirring, sequentially adding complexing agent (citric acid) and wetting agent, then adding defoaming agent; wherein the defoaming agent is added in small amounts and multiple times to avoid local excessive foaming;
[0018] Further, the mass ratio of the complexing agent, the wetting agent and the defoaming agent is 4-6:5-6:1;
[0019] The defoaming agent is: TEGO Foamex 842 (silicone polyether type), BYK-024 (silicone type water-based), Momentive SAG 1572 (polydimethylsiloxane type);
[0020] The complexing agent is: citric acid, GLDA (tetrasodium glutamate diacetate), IDS (iminodisuccinate)
[0021] The wetting agent is: Dynol 604 (acetylene glycol type), Surfynol 420 (TMDD derived ethoxylated), Surfynol 104.
[0022] Further, the process of adding metal precursors in the binder prepared in step 2 in step 3 is as follows: solid calcium acetate hydrate is added to the binder mixture in portions, and magnetic stirring is carried out until complete dissolution; then slowly add titanium bis-amino lactic acid dihydroxide, while stirring with a magnet, until the mixture is uniform.
[0023] Further, the amount ratio of the solid calcium acetate hydrate to the titanium bis-amino lactic acid dihydroxide is 1-5 mg:5.5-25 μL, and the concentration of the titanium bis-amino lactic acid dihydroxide is 1 mol / L.
[0024] A yttria ceramic core is formed by using the nano-calcium titanate binder for yttria ceramic jet printing, and then high-temperature densification sintering to obtain a yttria ceramic core.
[0025] The nano-calcium titanate binder prepared by the above method was used for yttrium oxide ceramic binder jet printing: The printing equipment consisted of an operating computer, a powder feeding cylinder, a forming cylinder, rollers, a nozzle, and a motor control unit. The operating computer was used to import the STL model of the part to be printed and to set key process parameters in the software, including the printing layer thickness (80 μm), binder saturation (40%), roller rotation direction, and speed. The powder feeding cylinder was located on the right side of the forming cylinder and pre-loaded with yttrium oxide powder; the rollers were mounted above the two cylinders, and the speed and direction were controlled by a motor to complete the powder spreading from right to left. Under the nominal conditions of the device, the rollers rotated counterclockwise at a speed of 60 r / min. The nozzle used the aforementioned water-based binder and was driven by the control panel and the motor to spray the pre-set pattern above the forming cylinder after the rollers had spread the powder.
[0026] The printing cycle is as follows: the roller spreads yttrium oxide powder from right to left → the nozzle sprays binder to form the cross section of the layer → the powder feeding cylinder rises by one layer thickness and the forming cylinder descends by one layer thickness → repeat the above steps until all slices are completed (the layer thickness is fixed at 80 μm).
[0027] The specific operating steps can be summarized as follows:
[0028] ① Power on: Start the operating computer and adhesive spraying equipment, and import the target STL into the software.
[0029] ② Material preparation: Add yttrium oxide powder to the powder feeding cylinder and add the pre-prepared water-based binder to the printhead cartridge.
[0030] ③ Job settings and printing: In the additive manufacturing software, set the rollers to rotate counterclockwise at a speed of 80 r / min; layer thickness of 80 μm; and binder saturation of 80%. During the printing process, the part blank is always embedded in the powder bed.
[0031] ④ Post-processing: After printing is completed, remove the entire printing substrate along with the printed powder bed and place it in an oven.
[0032] ⑤ Finishing: Exit the software and turn off the power to the computer and devices in sequence.
[0033] Furthermore, the printed yttrium oxide powder bed is placed in an oven and dried for 3–5 hours at a temperature of 180°C. After drying and cooling, excess powder around the blank is removed with an air gun.
[0034] Furthermore, the yttrium oxide ceramic blank is placed in a mullite crucible and then placed in a high-temperature box furnace for high-temperature sintering. It is heated to 1000℃ at a heating rate of 5℃ / min and held for 1 h, then heated to 1600℃ at a heating rate of 3℃ / min and held for 2 h, and then cooled naturally to finally obtain a high-performance yttrium oxide ceramic core.
[0035] Furthermore, the porosity of the obtained yttrium oxide ceramic core is 42.3~54.2%; the flexural strength is 12.2~28.3 MPa.
[0036] Compared with the prior art, the present invention has the following advantages:
[0037] 1. The system of this invention does not contain solid particles, has strong binder stability, and is more reliable during spraying, eliminating the risk of nozzle clogging. Furthermore, the binder has high utilization of Ca and Ti elements, which can be precisely controlled by adjusting the amount added.
[0038] 2. It does not introduce additional fine powder into the base powder, and does not change the morphology and tribological properties; it avoids problems such as decreased powder density, layered powder supply, and doctor blade wear during subsequent binder spraying printing.
[0039] 3. During the sintering process of this invention, in-situ CaTiO3 forms at the grain boundaries, reducing the uneven distribution of the reinforcing phase; and it can achieve accelerated sintering at a lower dosage, reducing glass phase residue and abnormal grain growth. Attached Figure Description
[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0041] Figure 1 Images showing the microstructure of different embodiments sintered at 1600℃;
[0042] Figure 2 Schematic diagrams showing the porosity and density after high-temperature sintering in different embodiments;
[0043] Figure 3 Figures showing dimensional changes after high-temperature sintering in different embodiments;
[0044] Figure 4 These are flexural strength diagrams after high-temperature sintering in different embodiments;
[0045] Figure 5 This is a photograph of the yttrium oxide ceramic core prepared in Example 2. Detailed Implementation
[0046] To gain a deeper understanding of this invention, we will provide a comprehensive and detailed description. However, this invention has various implementations and is not limited to the specific examples listed herein. These examples are presented to enhance a full understanding of the disclosure of this invention.
[0047] Example 1
[0048] This embodiment describes a nano-calcium titanate binder, its in-situ generation method, and its application. The specific process includes the following steps:
[0049] Step 1, Prepare the binder base solution: Add about 60 mL of deionized water to a beaker and place it in a magnetic stirrer at 300 rpm; add 6.0 g of propylene glycol and 2.0 g of glycerin in sequence, and stir magnetically for 5 min to make it uniform; slowly sprinkle in 2 g of polyvinyl alcohol (PVA) with a molecular weight of 18K, and maintain heating in a 45℃ water bath for 20 min until the solution is clear and free of particles; remove and cool to 25℃, add deionized water to 80 mL, and maintain the pH of the overall matrix solution at 6.8-7.2 and the surface tension at 25-35 mN / m.
[0050] Step 2: Add 0.25 g of citric acid to the adhesive base liquid and stir magnetically for 5 min; add 0.20 g of wetting agent Dynol604 and stir magnetically for 3 min; add 0.04 g of defoamer TEGO Foamex 842 in small amounts and dropwise to avoid excessive local foaming, and obtain the adhesive mixture.
[0051] Step 3: Weigh 1.40 mg of solid calcium acetate hydrate using an electronic balance, add it to the binder mixture in portions and stir magnetically until completely dissolved; use a microsyringe to measure 7.93 μL of titanium bisaminolactic acid dihydrogen hydrate (concentration of 1 mol / L), add it slowly dropwise along the wall of the cup while stirring magnetically for 10 min to obtain the binder precursor.
[0052] Step 4, pH correction: Measure the pH of the binder precursor prepared in Step 3 at 25°C using a pH meter, with a target pH of 7.0–7.5. If pH < 7.0, add 1% ammonia solution for fine adjustment; if pH > 7.5, add a small amount of citric acid solution to correct the pH.
[0053] Step 5, the specific process of adjusting the volume, filtering and degassing the binder solution prepared in Step 4, is as follows: Add deionized water to the prepared binder solution to 100 mL; perform staged filtration of the binder using a vacuum filtration device with 0.45 μm and 0.2 μm PES filter membranes at a vacuum degree of -0.07 MPa; pre-wet the filter membranes and discard the first 3 mL. Finally, degas the binder in a vacuum defoamer for 3 minutes to obtain nano-calcium titanate binder.
[0054] Yttrium oxide ceramic cores were prepared using the nano-calcium titanate binder obtained in this embodiment.
[0055] Step 6, the specific process of spray printing yttrium oxide ceramic binder into the nano calcium titanate binder prepared in step 5 is as follows: draw the required yttrium oxide ceramic core pattern using modeling software, and print it using the water-based binder prepared in step 5; the specific printing parameters are: the printing layer thickness is 80μm, the printing binder saturation is 40%, the roller rotates counterclockwise, and the rotation speed is 60 r / min.
[0056] Step 7, the specific process of post-processing the yttrium oxide blank printed in step 6 is as follows: put the yttrium oxide powder bed printed in step 6 into an oven and dry it for 3 hours at a drying temperature of 180°C; after drying and cooling, use an air gun to remove excess powder around the blank.
[0057] Step 8, the specific process of high-temperature densification sintering of the yttrium oxide blank after step 7 is as follows: the yttrium oxide ceramic blank is placed in a mullite crucible and placed in a high-temperature box furnace for high-temperature sintering. It is heated to 1000℃ at a heating rate of 5℃ / min and held for 1 h, then heated to 1600℃ at a heating rate of 3℃ / min and held for 2 h, and then cooled naturally to finally obtain a high-performance yttrium oxide ceramic core.
[0058] Example 2
[0059] This embodiment describes a nano-calcium titanate binder, its in-situ generation method, and its application. The specific process includes the following steps:
[0060] Step 1, Prepare the binder base solution: Add approximately 60 mL of deionized water to a beaker and place it in a magnetic stirrer at 400 rpm. Add 6.4 g of propylene glycol and 2.3 g of glycerin sequentially, stirring magnetically for 5 minutes until homogeneous. Slowly sprinkle in 2 g of PVA with a molecular weight of 18K, and maintain heating in a 60°C water bath for 40 minutes until the solution is clear and free of particles. Remove and cool to 25°C, then add deionized water to a final volume of 80 mL. Maintain the overall matrix solution pH at 6.8–7.2 and the surface tension at 25–35 mN / m.
[0061] Step 2: Add 0.25 g of GLDA to the adhesive base liquid and stir magnetically for 5 min; add 0.24 g of wetting agent Surfynol 420 and stir magnetically for 5 min; add 0.04 g of defoamer Momentive SAG 1572 in small amounts and multiple times to avoid excessive local foaming, and obtain the adhesive mixture.
[0062] Step 3: Weigh 6.29 mg of solid calcium acetate hydrate using an electronic balance, add it to the binder mixture in portions and stir magnetically until completely dissolved; measure 35.68 μL of titanium bisaminolactic acid dihydrogen hydrate (concentration of 1 mol / L) using a microsyringe, add it slowly dropwise along the cup wall while stirring magnetically for 10 min to obtain the binder precursor.
[0063] Step 4, pH correction: Measure the pH of the binder precursor prepared in Step 3 at 25°C using a pH meter, with a target pH of 7.0–7.5. If pH < 7.0, add 1% ammonia solution for fine adjustment; if pH > 7.5, add a small amount of citric acid solution to correct the pH.
[0064] Step 5, the specific process of adjusting the volume, filtering and degassing the binder prepared in Step 4, is as follows: Add deionized water to the prepared binder to 100 mL; perform staged filtration of the binder using a vacuum filtration device with 0.45 μm and 0.2 μm PES filter membranes at a vacuum degree of -0.07 MPa; pre-wet the filter membranes and discard the initial 3 mL. Finally, degas the binder in a vacuum defoamer for 5 minutes to obtain nano-calcium titanate binder.
[0065] Yttrium oxide ceramic cores were prepared using the nano-calcium titanate binder obtained in this embodiment.
[0066] Step 6, the specific process of spray printing yttrium oxide ceramic binder into the nano calcium titanate binder prepared in step 5 is as follows: draw the required yttrium oxide ceramic core pattern using modeling software, and print it using the water-based binder prepared in step 5; the specific printing parameters are: the printing layer thickness is 80μm, the printing binder saturation is 40%, the roller rotates counterclockwise, and the rotation speed is 60 r / min.
[0067] Step 7, the specific process of post-processing the yttrium oxide blank printed in step 6 is as follows: put the yttrium oxide powder bed printed in step 6 into an oven and dry it for 3 hours at a drying temperature of 180°C; after drying and cooling, use an air gun to remove excess powder around the blank.
[0068] Step 8, the specific process of high-temperature densification sintering of the yttrium oxide blank after step 7 is as follows: the yttrium oxide ceramic blank is placed in a mullite crucible and placed in a high-temperature box furnace for high-temperature sintering. It is heated to 1000℃ at a heating rate of 5℃ / min and held for 1 h, then heated to 1600℃ at a heating rate of 3℃ / min and held for 2 h, and then cooled naturally to finally obtain a high-performance yttrium oxide ceramic core.
[0069] Example 3
[0070] This embodiment describes a nano-calcium titanate binder, its in-situ generation method, and its application. The specific process includes the following steps:
[0071] Step 1, Prepare the binder base solution: Add approximately 60 mL of deionized water to a beaker and place it in a magnetic stirrer at 350 rpm. Add 6.2 g of propylene glycol and 2.2 g of glycerin sequentially, stirring magnetically for 5 minutes until homogeneous. Slowly sprinkle in 2 g of PVA with a molecular weight of 18K, and maintain heating in a 55°C water bath for 30 minutes until the solution is clear and free of particles. Remove and cool to 25°C, then add deionized water to a final volume of 80 mL. Maintain the overall matrix solution pH at 6.8–7.2 and the surface tension at 25–35 mN / m.
[0072] Step 2: Add 0.25 g of IDS to the adhesive base liquid and stir magnetically for 5 min; add 0.22 g of wetting agent Surfynol104 and stir magnetically for 4 min; add 0.04 g of defoamer BYK-024 in small amounts and dropwise to avoid excessive local foaming, and obtain the adhesive mixture.
[0073] Step 3: Weigh 3.75 mg of solid calcium acetate hydrate using an electronic balance, add it to the binder mixture in portions and stir magnetically until completely dissolved; measure 21.30 μL of titanium bisaminolactic acid dihydrogen hydrate (concentration 1 mol / L) using a microsyringe, add it slowly dropwise along the cup wall while stirring magnetically for 10 min to obtain the binder precursor.
[0074] Step 4, pH correction: Measure the pH of the binder precursor prepared in Step 3 at 25°C using a pH meter, with a target pH of 7.0–7.5. If pH < 7.0, add 1% ammonia solution for fine adjustment; if pH > 7.5, add a small amount of citric acid solution to correct the pH.
[0075] Step 5, the specific process of adjusting the volume, filtering and degassing the binder prepared in Step 4, is as follows: Deionized water is added to the binder prepared in Step 4 to 100 mL; the binder is then filtered in stages using a vacuum filtration device with 0.45 μm and 0.2 μm PES filter membranes at a vacuum degree of -0.07 MPa. The filter membranes are pre-wetted, and the initial 3 mL is discarded. Finally, the binder is degassed in a vacuum defoamer for 3 minutes to obtain nano-calcium titanate binder.
[0076] Yttrium oxide ceramic cores were prepared using the nano-calcium titanate binder obtained in this embodiment.
[0077] Step 6, the specific process of spray printing yttrium oxide ceramic binder into the nano calcium titanate binder prepared in step 5 is as follows: draw the required yttrium oxide ceramic core pattern using modeling software, and print it using the water-based binder prepared in step 5; the specific printing parameters are: the printing layer thickness is 80μm, the printing binder saturation is 40%, the roller rotates counterclockwise, and the rotation speed is 60 r / min.
[0078] Step 7, the specific process of post-processing the yttrium oxide blank printed in step 6 is as follows: put the yttrium oxide powder bed printed in step 6 into an oven and dry it for 3 hours at a drying temperature of 180°C; after drying and cooling, use an air gun to remove excess powder around the blank.
[0079] Step 8, the specific process of high-temperature densification sintering of the yttrium oxide blank after step 7 is as follows: the yttrium oxide ceramic blank is placed in a mullite crucible and placed in a high-temperature box furnace for high-temperature sintering. It is heated to 1000℃ at a heating rate of 5℃ / min and held for 1 h, then heated to 1600℃ at a heating rate of 3℃ / min and held for 2 h, and then cooled naturally to finally obtain a high-performance yttrium oxide ceramic core.
[0080] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.
Claims
1. A method for in-situ generation of a nano-calcium titanate binder, characterized in that: Includes the following steps: Step 1: Prepare the adhesive base liquid from polyvinyl alcohol, propylene glycol, glycerin and deionized water; Step 2: Add complexing agent, wetting agent and defoamer to the adhesive base liquid to obtain adhesive mixture; Step 3: Add a metal precursor to the binder mixture to obtain the binder precursor; Step 4: Perform pH correction on the binder precursor to maintain the pH at 7.0–7.5; Step 5: Then, the volume is adjusted, filtered, and degassed to obtain nano-calcium titanate binder.
2. The in-situ generation method of a nano-calcium titanate binder according to claim 1, characterized in that: Step 1 involves preparing an adhesive base solution from polyvinyl alcohol, propylene glycol, glycerin, and deionized water. Specifically, propylene glycol and glycerin are added sequentially to deionized water and mixed under magnetic stirring. Polyvinyl alcohol is then slowly added, and the solution is heated in a water bath until it is clear and free of particles. After cooling, deionized water is added to maintain the overall matrix solution at a pH of 6.8–7.2 and a surface tension of 25–35 mN / m.
3. The in-situ generation method of a nano-calcium titanate binder according to claim 2, characterized in that: The mass ratio of propylene glycol, glycerol, and polyvinyl alcohol is 3–3.2:1–1.2:1; the water bath heating temperature is 45–60°C, and the heating time is 20–40 min; the magnetic stirring speed is 300–400 rpm.
4. The in-situ generation method of a nano-calcium titanate binder according to claim 1, characterized in that: In step 2, a complexing agent, a wetting agent, and a defoamer are added to the adhesive base liquid to obtain a mixture. Specifically, the complexing agent and the wetting agent are added to the adhesive base liquid in sequence under magnetic stirring, and then the defoamer is added. The defoamer is added in small amounts and multiple times to avoid excessive local foaming.
5. The in-situ generation method of a nano-calcium titanate binder according to claim 4, characterized in that: The mass ratio of complexing agent, wetting agent and defoamer is 4-6:5-6:
1.
6. The in-situ generation method of a nano-calcium titanate binder according to claim 5, characterized in that: The defoaming agent is: organosilicon polyether, water-based organosilicon, or polydimethylsiloxane; The complexing agents are: citric acid, GLDA, and IDS; The wetting agents are: acetylene glycols, Surfynol 420, and Surfynol 104.
7. The in-situ generation method of a nano-calcium titanate binder according to claim 1, characterized in that: The specific process of adding the metal precursor to the binder prepared in step 2 in step 3 is as follows: solid calcium acetate hydrate is added to the binder mixture in batches and magnetically stirred until completely dissolved; then titanium diaminolactic acid dihydrogen hydrate is slowly added dropwise while magnetically stirring until the mixture is uniform.
8. The in-situ generation method of a nano-calcium titanate binder according to claim 1, characterized in that: The ratio of solid calcium acetate hydrate to titanium bis(aminolactic acid) dihydrogen hydrate is 1–5 mg: 5.5–25 μL, and the concentration of titanium bis(aminolactic acid) dihydrogen hydrate is 1 mol / L.
9. A yttrium oxide ceramic core, characterized in that, The nano-calcium titanate binder is prepared using the preparation method described in any one of claims 1 to 8; yttrium oxide ceramic is jet-printed using the nano-calcium titanate binder, and then subjected to high-temperature densification sintering to obtain a yttrium oxide ceramic core.
10. A yttrium oxide ceramic core according to claim 9, characterized in that, The porosity of the yttrium oxide ceramic core is 42.3~54.2%; the flexural strength is 12.2~28.3 MPa.