A ceramic continuous light-curing 3D printing method based on infrared light

Abstract

The application relates to a ceramic continuous photocuring 3D printing method based on infrared light, which comprises the following steps: mixing ceramic slurry and up-conversion material to prepare photocuring ceramic material; filling the photocuring ceramic material into a forming groove; moving a printing platform to a preset position and starting a stirring device; a light source device emits near-infrared light to irradiate the photocuring ceramic material to excite the up-conversion material to emit ultraviolet light; and meanwhile, the forming platform rotates relative to the printing platform. The method of the application utilizes the characteristics that the up-conversion material emits ultraviolet light after being excited by infrared light to realize the surface layer and deep curing of the ceramic slurry, and further realizes the continuous forming of ceramics, so as to solve the problem that the traditional ultraviolet light is difficult to penetrate and realize the continuous photocuring of ceramics. In addition, the rotating setting of the forming platform relative to the printing platform can accelerate the interface liquid supplementing and mass transfer, meanwhile, the solid residues at the bottom of the forming groove are avoided, the continuous curing is affected, the ceramic slurry heat dissipation is promoted, and over-curing is prevented.

Description

Technical Field

[0001] This invention relates to the technical field of photopolymerization 3D printing, and more particularly to a method for continuous photopolymerization 3D printing of ceramics based on infrared light. Background Technology

[0002] Ultraviolet light is an important light source for traditional photocuring. Its main characteristics are short wavelength and high energy, but poor penetration and insufficient curing depth, making it difficult to achieve continuous photocuring of materials such as ceramics and metals with high refractive index.

[0003] Existing photopolymerization 3D printing devices generally rely on oxygen-inhibiting films to allow oxygen permeability to the release film. This utilizes the principle of oxygen inhibition to create a non-curing liquid "dead zone" layer between the molding material and the release film. This curing method requires a high depth of light penetration, making it unsuitable for molding materials with shallow curing depths. The second method is the self-lubricating film method, which uses a self-lubricating film that releases fluorinated or silicone oil to achieve low-adhesion separation between the molded structure and the release film. However, the lubricant inside the release film is easily consumed, leading to a decrease in film performance. The third method is the oil film method, which uses fluorinated or silicone oil to create a thick oil film. The photopolymerized liquid is located directly on top of the oil film. Because the molding platform exerts forces on the oil film during lifting, the oil film surface becomes very unstable, affecting molding accuracy.

[0004] Therefore, continuous photopolymerization is currently mainly used for transparent resins or low-refractive-index, high-transmittance ceramic slurries (such as silica), and is difficult to apply to high-refractive-index, low-transmittance ceramic slurries. For example, patent document CN113233892A discloses a zirconia ceramic slurry doped with upconversion luminescent material and its photopolymerization 3D printing apparatus and method. The components of the zirconia ceramic slurry by weight percentage include: 0.5-5% photoinitiator, 0.1-5% upconversion luminescent material, 18.25%-26.25% monomer, 62.5%-72.5% nano-zirconia powder, and 8.25%-11.25% solvent; the upconversion luminescent material is prepared by doping a matrix with rare earth ions. The upconversion luminescent material disclosed in this scheme allows the ceramic slurry to be excited under near-infrared light, and the excitation light penetrates deeper into the slurry. However, after prolonged photopolymerization, this scheme results in ceramic slurry sedimentation and localized overpolymerization, making it difficult to achieve continuous photopolymerization of ceramics. In addition, current continuous photocuring is mainly for low-viscosity resin materials, while high-viscosity ceramic materials have difficulties in interfacial mass transfer and liquid replenishment. Summary of the Invention

[0005] The first objective of this invention is to provide a method for continuous photopolymerization 3D printing of ceramics based on infrared light, which aims to solve the technical problems of traditional ultraviolet light having shallow penetration, making it difficult to achieve continuous photopolymerization of ceramics and difficult to perform interface liquid replenishment during continuous molding.

[0006] To solve the above technical problems, a method for continuous photopolymerization 3D printing of ceramics based on infrared light is provided and applied in a printing device. The printing device includes a forming platform, a printing platform, a stirring device, and a light source device. The forming platform has a forming groove.

[0007] The method includes:

[0008] S1, a photocurable ceramic material is prepared by mixing ceramic slurry and upconversion material;

[0009] S2, fill the photocurable ceramic material into the molding groove;

[0010] S3, move the printing platform to the preset position and start the stirring device;

[0011] S4, the light source device emits near-infrared light to irradiate the photocurable ceramic material, thereby exciting the upconversion material to emit ultraviolet light. At the same time, the molding platform rotates relative to the printing platform.

[0012] Furthermore, the ceramic slurry comprises one or more of silicon oxide, aluminum oxide, zirconium oxide, silicon carbide, silicon nitride, magnesium oxide, tricalcium phosphate, titanium carbide, piezoelectric ceramics, and hydroxyapatite.

[0013] Furthermore, the viscosity of the ceramic slurry is in the range of [100, 3000] mPa·s.

[0014] Furthermore, in the photocurable ceramic material, the proportion of the upconversion material added is 0.1%-10%.

[0015] Furthermore, the photocurable ceramic material includes one or more of Yb, Er, Tm, Nd, Mn²⁺, Cr³⁺, core-shell structured upconversion particles, and organic-inorganic hybrid upconversion materials.

[0016] Further, the photocurable ceramic material includes Yb and Er; or, the photocurable ceramic material includes Yb and Tm; or, the photocurable ceramic material includes Nd; or, the photocurable ceramic material includes Mn²⁺; or, the photocurable ceramic material includes Cr³⁺; or, the photocurable ceramic material includes core-shell structured upconversion particles; or, the photocurable ceramic material includes organic-inorganic hybrid upconversion materials.

[0017] Furthermore, the rotation speed of the molding platform is set to 0.1-50 rpm; the rotation speed of the stirring device is set to 5-100 rpm.

[0018] Furthermore, during the printing process, the printing platform moves in a direction away from the forming platform, and the moving speed of the printing platform is set to 0.1-20mm / s.

[0019] Furthermore, the wavelength of the near-infrared light is set to be between 700-1200 nm.

[0020] Implementing the embodiments of the present invention will have the following beneficial effects:

[0021] This embodiment presents an infrared-based continuous photopolymerization 3D printing method for ceramics. The method utilizes the high penetration and deep penetration of infrared light to irradiate the upconversion material in the photopolymerization ceramic material at the interface. The upconversion material, excited by infrared light, emits ultraviolet light, which solidifies both the surface and deep layers of the ceramic slurry, thus achieving continuous ceramic forming. This solves the problem of shallow penetration of traditional ultraviolet light, which makes continuous photopolymerization difficult. Furthermore, the rotating molding platform relative to the printing platform has several advantages: first, it accelerates interface liquid replenishment and mass transfer, improving continuous forming speed; second, it prevents overexposure of the ceramic slurry at the bottom of the molding tank, preventing solid residue formation and hindering continuous curing; and third, it promotes heat dissipation from the ceramic slurry, preventing over-curing. Additionally, the stirring device agitates the photopolymerization ceramic material, reducing the accumulation of heat from the photopolymerization reaction in the molding area, thereby achieving high-speed photopolymerization 3D printing. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a flowchart of the infrared light-based continuous photopolymerization 3D printing method for ceramics according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the printing device described in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram illustrating the principle of continuous photocuring of ceramics based on infrared light, as described in an embodiment of the present invention.

[0026] Wherein: 100, printing device; 110, forming platform; 111, enclosing side plate; 112, release plate; 113, forming groove; 120, printing platform; 130, stirring device; 140, light source device; A, vertical line; X, first rotation center; Y, second rotation center;

[0027] 200, Completed curing section; 300, Cured layer; 400, Liquid flow layer. Detailed Implementation

[0028] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0029] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Please refer to Figures 1-3 This invention provides a method for continuous photopolymerization 3D printing of ceramics based on infrared light, which is applied in a printing device 100. The printing device 100 includes a forming platform 110, a printing platform 120, a stirring device 130 and a light source device 140. The forming platform 110 has a forming groove 113.

[0032] The methods include:

[0033] S1, a photocurable ceramic material is prepared by mixing a ceramic slurry and an upconversion material; exemplarily, the photocurable ceramic material is in a liquid state at this time. An upconversion material is a material capable of converting low-energy light (such as infrared light) into high-energy light (such as ultraviolet or visible light). During 3D printing, an infrared light source irradiates the upconversion material in the ceramic slurry. After absorbing the energy of the infrared light, the upconversion material emits ultraviolet or visible light through an upconversion process. This high-energy light can trigger the photocuring reaction of the photosensitive ceramic slurry, causing the slurry to change from a liquid to a solid state, thereby achieving 3D printing.

[0034] S2, fill the photocurable ceramic material into the molding groove 113;

[0035] S3, move the printing platform 120 to the preset position and start the stirring device 130;

[0036] S4, the light source device 140 emits near-infrared light to irradiate the photocurable ceramic material, thereby exciting the upconversion material to emit ultraviolet light. Simultaneously, the molding platform 110 rotates relative to the printing platform 120. For example, please refer to... Figure 3 During the photocuring process using the printing device 100, in the direction from the printing platform 120 to the bottom of the forming tank 113, the photocurable ceramic material sequentially forms a cured portion 200, a cured layer 300, and a liquid flow layer 400. The cured layer 300 is connected to the cured portion 200, and the cured layer 300 is separated from the bottom of the forming tank 113 by the flowing liquid flow layer 400. This application utilizes infrared light to penetrate the ceramic slurry at the forming interface, using the superconverted material as the energy medium. Infrared light irradiates the superconverted material inside the ceramic slurry, exciting it and causing it to emit ultraviolet light, indirectly achieving ultraviolet-induced deep curing of the ceramic slurry, thereby realizing continuous ceramic forming. This application addresses the challenge of shallow ultraviolet light penetration, which makes continuous forming of high-refractive-index, difficult-to-penetrate, and dark-colored slurries difficult. Therefore, near-infrared light is used because it has high penetrability, allowing it to penetrate deeper into the ceramic slurry, which is beneficial for continuous photocuring.

[0037] Please refer to Figure 1 , Figure 2 and Figure 3This embodiment presents an infrared-based continuous photopolymerization 3D printing method for ceramics. The method utilizes the high penetration and deep penetration of infrared light to irradiate the conversion material particles in the photopolymerization ceramic material at the interface. The conversion material particles emit ultraviolet light after being excited by infrared light, achieving surface and deep curing of the ceramic slurry through ultraviolet light, thus realizing continuous ceramic forming. This solves the problem of traditional ultraviolet light having shallow penetration, making continuous photopolymerization difficult. Furthermore, the forming platform 110 is rotated relative to the printing platform 120. Firstly, this accelerates interface liquid replenishment and mass transfer, which is beneficial for increasing the continuous forming speed. Secondly, it avoids overexposure of the ceramic slurry on the bottom surface of the forming tank 113, preventing solid residue formation and affecting continuous curing. Thirdly, it promotes heat dissipation of the ceramic slurry, preventing over-curing. Additionally, the stirring device 130 reduces the flow of photopolymerization material by the stirring of the photopolymerization material, thus achieving high-speed photopolymerization 3D printing.

[0038] In this design, the rotation of the molding platform 110 relative to the printing platform 120 produces the following beneficial effects:

[0039] First, the contact time between the cured layer 300 and the liquid flow layer 400 is reduced. When the bottom plate of the molding tank 113 and the printing platform 120 move relative to each other, the contact time between the cured layer 300 and the liquid flow layer 400 is decreased. This relative movement allows the cured layer 300 to detach from the surface of the liquid flow layer 400 more quickly during each ascent, thereby reducing the residence time of the liquid flow layer 400 on the surface of the cured layer 300. This helps prevent the liquid flow layer 400 from over-curing on the surface of the cured layer 300, forming solid residues that could affect the continuous curing process.

[0040] Secondly, relative motion promotes the flow of the liquid flow layer 400. When the bottom plate of the molding tank 113 and the printing platform 120 move relative to each other, the liquid flow layer 400 forms a dynamic flow layer between them. This flow layer can replenish the solidified layer 300 more quickly, ensuring that the liquid flow layer 400 can fill the gaps in the solidified layer 300 in a timely manner, thereby achieving continuous molding. The flowing liquid flow layer 400 can better fill the microscopic unevenness of the solidified layer 300, improving molding accuracy.

[0041] Third, relative motion reduces the adhesion between the cured layer 300 and the bottom plate of the molding tank 113. When the bottom plate of the molding tank 113 and the printing platform 120 move relative to each other, the contact area between the cured layer 300 and the bottom plate of the molding tank 113 decreases, and the adhesion also decreases. This makes it easier for the cured layer 300 to detach from the bottom plate of the molding tank 113, reducing the adhesion between the cured layer 300 and the bottom plate of the molding tank 113, and preventing the cured layer 300 from forming solid residues on the bottom plate of the molding tank 113.

[0042] Fourth, relative motion also promotes heat dissipation. Infrared light has a thermal effect; prolonged exposure can cause the temperature of the liquid flow layer 400 to rise, affecting the curing effect. The relative motion between the bottom plate of the molding tank 113 and the printing platform 120 can drive the liquid flow layer 400 to flow, thereby promoting heat dissipation and preventing the liquid flow layer 400 from overheating and curing. At the same time, the stirring action of the stirring device 130 can further promote heat dissipation, ensuring that the liquid flow layer 400 cures at a suitable temperature.

[0043] Fifth, relative motion can transform the solidification interface from a "solid-liquid-solid" to a "solid-liquid" interface. In traditional 3D printing, a "solid-liquid-solid" interface is typically formed between the solidified layer 300 and the liquid flow layer 400, meaning there are two solid interfaces between the solidified layer 300, the liquid flow layer 400, and the bottom plate of the forming tank 113. This interface structure easily leads to adhesion between the solidified layer 300 and the bottom plate of the forming tank 113, affecting continuous molding. However, relative motion can reduce the contact between the solidified layer 300 and the bottom plate of the forming tank 113, forming a "solid-liquid" interface, meaning there is only one liquid interface between the solidified layer 300 and the liquid flow layer 400. This helps reduce adhesion between the solidified layer 300 and the bottom plate of the forming tank 113, improving the speed and accuracy of continuous molding.

[0044] Sixth, the relative motion also prevents the ceramic slurry from settling. Ceramic slurry has a high viscosity and is prone to settling during printing, leading to uneven printing. The relative motion between the base plate of the forming tank 113 and the printing platform 120 drives the ceramic slurry to flow, preventing settling and ensuring that the ceramic slurry remains evenly distributed throughout the printing process, thus improving print quality.

[0045] In one possible implementation, the ceramic slurry comprises one or more of silicon oxide, aluminum oxide, zirconium oxide, silicon carbide, silicon nitride, magnesium oxide, tricalcium phosphate, and titanium carbide.

[0046] In one possible implementation, the viscosity of the ceramic slurry is in the range of [1, 10] Pa·s. Exemplarily, the viscosity of the ceramic slurry can be set to 2 Pa·s, or 3 Pa·s, or 4 Pa·s, or 5 Pa·s, or 6 Pa·s, or 7 Pa·s, or 8 Pa·s, or 9 Pa·s.

[0047] In one possible implementation, the upconversion material is added to the photocurable ceramic material at a ratio of 0.1% to 10%. Exemplarily, this range of 0.1% to 10% is experimentally optimized to ensure the best balance between photocuring effect and material performance. When the upconversion material ratio is low, although photocuring can be achieved, the upconversion efficiency is relatively low, resulting in weaker emitted ultraviolet or visible light intensity and a slower photocuring speed. When the upconversion material ratio is high, the upconversion efficiency is improved, the emitted ultraviolet or visible light intensity is enhanced, and the photocuring speed is accelerated. However, an excessively high ratio may increase the viscosity of the ceramic slurry, affecting its flowability and printing accuracy; simultaneously, too much upconversion material may absorb excessive infrared light energy, leading to localized overheating and affecting the quality and performance of the printed parts. Preferably, in this embodiment, the upconversion material ratio is 2.5%. Of course, in specific applications, the upconversion material ratio can also be set to 3%, 1%, 2%, 4%, 5%, 6%, 7%, 8%, or 9%.

[0048] In one possible implementation, the photocurable ceramic material includes one or more of Yb, Er, Tm, Nd, Mn²⁺, Cr³⁺, core-shell upconversion particles, and organic-inorganic hybrid upconversion materials.

[0049] In one possible implementation, the photocurable ceramic material includes Yb and Er; or, the photocurable ceramic material includes Yb and Tm; or, the photocurable ceramic material includes Nd; or, the photocurable ceramic material includes Mn²⁺; or, the photocurable ceramic material includes Cr³⁺; or, the photocurable ceramic material includes core-shell structured upconversion particles; or, the photocurable ceramic material includes organic-inorganic hybrid upconversion materials. Exemplarily, the photocurable ceramic material has several implementations. A first implementation is a ytterbium (Yb) and erbium (Er) doped system. The upconversion particles in this system typically have high upconversion efficiency, capable of effectively converting infrared light into ultraviolet or visible light. The particle size is between 10-50 nm. Smaller particle sizes help improve particle dispersion in the ceramic slurry, reduce light scattering, and thus improve photocuring efficiency. The mixing ratio is generally between 0.1% and 10%, and the specific ratio needs to be optimized based on the slurry viscosity and photocuring speed. The second implementation method is a ytterbium (Yb) and thulium (Tm) doping system. This system has relatively large upconversion particle sizes, typically between 20-80 nm. Larger particle sizes may increase light scattering, but may also improve upconversion efficiency. The mixing ratio is also between 0.1% and 10%, and needs to be adjusted according to actual application requirements and slurry characteristics. The third implementation method is a neodymium (Nd) doping system. Nd-doped upconversion particles typically have sizes around 30-60 nm, exhibiting good stability and upconversion efficiency. The selection of the mixing ratio needs to consider the light absorption characteristics of the Nd-doped system and the photocuring requirements of the ceramic slurry, generally between 0.1% and 10%. The fourth implementation method is a manganese (Mn²⁺) doping system. Manganese-doped upconversion particles have a wide particle size range, from 10-100 nm. This system has high upconversion efficiency, but the larger particle size may increase slurry viscosity. The mixing ratio needs to be optimized based on the light absorption characteristics of the manganese-doped system and the flowability of the slurry, typically between 0.1% and 10%. The fifth implementation method is a chromium (Cr³⁺) doped system. Chromium-doped upconversion particles have a smaller particle size, generally 5-50 nm. Smaller particle size helps improve particle dispersion in the slurry and reduces light scattering. The mixing ratio is generally between 0.1% and 10%, with the specific ratio needing adjustment based on the light absorption characteristics and photocuring effect of the chromium-doped system. The sixth implementation method uses core-shell structured upconversion particles. These particles have a core-shell structure, with the core portion having a particle size of 10-50 nm and the outer shell thickness of several nanometers to tens of nanometers. The core-shell structure can improve particle stability and upconversion efficiency. The mixing ratio needs to be optimized based on the characteristics of the core-shell structured particles and the photocuring requirements of the slurry, typically between 0.1% and 10%. Core-shell structured upconversion particles are nanomaterials with a special structure, consisting of a core portion and an outer shell portion.The core component is typically composed of rare-earth-doped inorganic nanomaterials, such as fluorides, oxides, or phosphates doped with ytterbium (Yb), erbium (Er), thulium (Tm), and neodymium (Nd). This core component absorbs infrared light and performs upconversion, emitting ultraviolet or visible light. These rare-earth ions possess unique electronic energy level structures, enabling them to effectively absorb infrared light and convert it into high-energy light. The outer shell is typically composed of inorganic materials (such as silica and alumina) or organic materials (such as polymers). The shell protects the core component from environmental factors (such as water, oxygen, and chemical reagents), improving particle stability and lifespan. A seventh implementation is an organic-inorganic hybrid upconversion material. This material has a wide particle size range; the inorganic upconversion nanoparticles are typically 5-30 nm in size, while the size of the organic portion depends on the specific organic material and synthesis method. The overall hybrid particle size may be between 50-300 nm. The organic-inorganic hybrid structure can improve particle dispersibility and photocuring efficiency. The mixing ratio needs to be adjusted according to the characteristics of the hybrid materials and the performance requirements of the slurry, generally between 0.1% and 10%. Organic-inorganic hybrid upconversion materials are composite materials combining organic materials and inorganic upconversion nanoparticles. Inorganic upconversion nanoparticles are typically composed of rare-earth-doped inorganic nanomaterials, such as ytterbium (Yb), erbium (Er), thulium (Tm), neodymium (Nd), etc., doped with fluorides, oxides, or phosphates. These inorganic upconversion nanoparticles are responsible for absorbing infrared light and performing upconversion, emitting ultraviolet or visible light. These rare-earth ions have unique electronic energy level structures, enabling them to effectively absorb infrared light and convert it into high-energy light. Organic materials can be polymers, small-molecule organic compounds, surfactants, etc. Organic materials can improve the dispersibility of inorganic upconversion nanoparticles in the composite material and prevent particle aggregation.

[0050] Please refer to Figure 2 In one possible implementation, the rotation speed of the molding platform 110 is set to 0.1-50 rpm; the rotation speed of the stirring device 130 is set to 5-100 rpm. Exemplarily, using the printing method of this application, during the printing process, the rotation of the stirring device 130 in the molding tank 113 (rotation speed 5-100 rpm) causes the photocurable ceramic material to flow, preventing solidification between the photocurable ceramic material and the release plate 112. This transforms the curing interface from a "solid-liquid-solid" to a "solid-liquid" interface, which is beneficial for the release force between the curing interface of the part and the release plate 112, preventing ceramic slurry sedimentation and eliminating curing residue. Simultaneously, since near-infrared light generates a large amount of heat, the stirring of the stirring device 130 and the relative movement between the photocurable ceramic material and the release plate 112 promote heat dissipation during the printing process, thereby achieving continuous curing.

[0051] Please refer to Figure 3 In one possible implementation, during the printing process, the printing platform 120 moves in a direction away from the forming platform 110, and the moving speed of the printing platform 120 is set to 100-1500 mm / min.

[0052] In one possible implementation, the wavelength of the near-infrared light is set between 700 and 1200 nm. For example, the wavelength of the near-infrared light can be set to 800 nm, 900 nm, 1000 nm, or 1100 nm.

[0053] Please refer to Figure 2 and Figure 3 A second objective of this invention is to provide a printing apparatus 100 for implementing the aforementioned infrared light-based continuous photopolymerization 3D printing method for ceramics, comprising a forming platform 110, a printing platform 120, a stirring device 130, and a light source device 140. The forming platform 110 includes a surrounding side plate 111 and a release plate 112 connected to the surrounding side plate 111, the surrounding side plate 111 and the release plate 112 forming a forming groove 113. The printing platform 120 is disposed on a first side of the forming platform 110; the stirring device 130 is disposed on the first side of the forming platform 110 and located beside the printing platform 120; the light source device 140 is disposed on a second side of the forming platform 110, and the printing platform 120 and the light source device 140 are arranged on the same vertical line A. For example, the stirring device 130 is a small mixer with a power supply of 100~240V / 50Hz, a motor power of 300W, a speed range of 30-2000rpm, a speed setting accuracy of ±1rpm, a stirring volume (H2O) of 0.05-50L, and a processing viscosity of 100000CP. The release plate 112 is made of a transparent material to infrared light, including various types of glass, silicon dioxide, plexiglass, polymethyl methacrylate, high molecular weight polyethylene, silicone film, and fluorinated film. Specifically, in this embodiment, the release plate 112 is a plexiglass plate with a thickness of 2mm, which allows near-infrared light to penetrate well.

[0054] Please refer to Figure 2 and Figure 3Furthermore, the printing platform 120 and the stirring device 130 are positioned above the forming platform 110, and the light source device 140 is positioned below the forming platform 110, with the central axis of the light source device 140 coinciding with the central axis of the printing platform 120. The stirring device 130 rotates around a first rotation center X, and the forming platform 110 rotates around a second rotation center Y, with the first rotation center X and the second rotation center Y coinciding. Furthermore, the stirring device 130 and the molding platform 110 rotate in opposite directions. For example, the stirring device 130 rotates clockwise, while the molding platform 110 rotates counterclockwise. This causes the photocurable ceramic material to rotate clockwise, while the molding platform 110 rotates counterclockwise. This opposite rotation direction helps to further increase the relative movement between the photocurable ceramic material and the release plate 112, thereby further reducing the contact time between the cured layer 300 and the liquid flow layer 400, further promoting the flow of the liquid flow layer 400, further reducing the adhesion between the cured layer 300 and the bottom plate of the molding tank 113, further promoting heat dissipation, and further preventing the ceramic slurry from settling. Of course, it can also be reversed, with the stirring device 130 rotating counterclockwise and the molding platform 110 rotating clockwise.

[0055] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A ceramic continuous light-curing 3D printing method based on infrared light, applied to a printing device, characterized in that, The printing device comprises a forming platform, a printing platform, a stirring device and a light source device, and the forming platform is formed with a forming groove; The method comprises: S1, mixing ceramic slurry and upconversion material to prepare a photocured ceramic material; S2, filling the photocured ceramic material into the forming groove; S3, moving the printing platform to a preset position and starting the stirring device; S4, the light source device emits near-infrared light to irradiate the photocured ceramic material to excite the upconversion material to emit ultraviolet light, and the forming platform rotates relative to the printing platform; The photocured ceramic material comprises one or more of Yb, Er, Tm, Nd, Mn²⁺, Cr³⁺, core-shell structure upconversion particles, and organic-inorganic hybrid upconversion material; The rotation speed of the forming platform is set to 0.1-50 rpm, and the rotation speed of the stirring device is set to 5-100 rpm; During printing, the printing platform moves away from the forming platform, and the moving speed of the printing platform is set to 0.1-20 mm / s; The wavelength of the near-infrared light is set to 700-1200 nm.

2. The ceramic continuous infrared light solidification 3D printing method according to claim 1, wherein, The ceramic slurry comprises one or more of silicon oxide, aluminum oxide, zirconium oxide, silicon carbide, silicon nitride, magnesium oxide, tricalcium phosphate, titanium carbosilide, piezoelectric ceramic, and hydroxyapatite.

3. The ceramic continuous infrared light solidification 3D printing method according to claim 2, wherein, The viscosity of the ceramic slurry ranges between [100, 3000] mPa・s.

4. The ceramic continuous infrared light solidification 3D printing method according to claim 1, wherein, In the photocured ceramic material, the addition ratio of the upconversion material is 0.1%-10%.

5. The method of claim 1, wherein the infrared light based ceramic continuous light solidification 3D printing method is characterized by, The photocured ceramic material comprises Yb and Er; or the photocured ceramic material comprises Yb and Tm; or the photocured ceramic material comprises Nd; or the photocured ceramic material comprises Mn²⁺; or the photocured ceramic material comprises Cr³⁺; or the photocured ceramic material comprises core-shell structure upconversion particles; or the photocured ceramic material comprises organic-inorganic hybrid upconversion material.

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