Ceramic continuous photocuring 3D printing method and device based on infrared light

Abstract

The invention relates to a ceramic continuous photocuring 3D printing method and device based on infrared light. The method comprises the steps that ceramic slurry and an up-conversion material are mixed to prepare a photocuring ceramic material; the forming groove is filled with a photocuring ceramic material; the printing platform is moved to a preset position, and a stirring device is started; the light source device emits near-infrared light to irradiate the photocuring ceramic material so as to excite the upconversion material to emit ultraviolet light, and meanwhile the forming platform rotates relative to the printing platform. According to the method, the surface layer and the deep part of the ceramic slurry are cured by utilizing the characteristic that the upconversion material emits ultraviolet light after being excited by infrared light, so that continuous forming of the ceramic is realized, and the problem that continuous photocuring of the ceramic is difficult to realize due to shallow penetration of traditional ultraviolet light is solved; in addition, the forming platform is rotationally arranged relative to the printing platform, interface liquid supplementing mass transfer can be accelerated, meanwhile, solid residues at the bottom of the forming groove are avoided, continuous curing is not affected, heat dissipation of the ceramic slurry can be promoted, and over-curing is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of photocuring 3D printing, and in particular to a ceramic continuous photocuring 3D printing method and device based on infrared light. Background Art

[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 a high refractive index.

[0003] Existing photocuring 3D printing devices generally rely on the oxygen inhibition film method to make the release film oxygen permeable, and use the oxygen inhibition principle to construct a non-cured liquid "dead zone" layer between the molding material and the release film. This curing method has high requirements on the penetration depth of light and is not conducive to the molding of materials with a smaller curing depth; the second type is the self-lubricating film method, which achieves low-adhesion separation of the molding structure and the molding film by constructing a self-lubricating film that can release fluorinated oil or silicone oil, but the lubricating liquid inside the release film is easily consumed, thereby reducing the performance of the film; the third type is the oil film method, which uses fluorinated oil or silicone oil to construct a thicker oil film, and the photopolymerized liquid is directly above the oil film. Due to the force on the oil film during the lifting of the molding platform, the surface of the oil film becomes very unstable, thereby affecting the molding accuracy.

[0004] Therefore, at present, continuous photocuring molding is mainly used for transparent resins or low refractive index, high transmittance ceramic slurries (such as silicon dioxide), and it is difficult to apply to high refractive, low transmittance ceramic slurries. For example, the patent document with publication number CN113233892A discloses a zirconia ceramic slurry doped with upconversion luminescent material and its photocuring 3D printing device and method. The components of the zirconia ceramic slurry in weight percentage include: 0.5-5% photoinitiator, 0.1-5% upconversion luminescent material, 18.25%-26.25% monomer, 62.5%-72.5% nano zirconium oxide powder, and 8.25%-11.25% solvent; the upconversion luminescent material is prepared by doping the matrix with rare earth ions. The upconversion luminescent material disclosed in this scheme enables the ceramic slurry to be excited under near-infrared light, and the excitation light has a stronger penetration depth in the slurry. However, after a long period of photocuring, the scheme will cause ceramic slurry precipitation and local overcuring, making it difficult to achieve continuous photocuring of ceramics. In addition, continuous light curing is currently mainly used for low-viscosity resin materials, and high-viscosity ceramic materials have the problem of difficult interface mass transfer and fluid replenishment. Summary of the invention

[0005] The first purpose of the present invention is to provide a ceramic continuous light curing 3D printing method based on infrared light, which aims to solve the technical problems that traditional ultraviolet light has shallow penetration and is difficult to achieve continuous light curing of ceramics and difficult to perform interface fluid replenishment during the continuous molding process.

[0006] In order to solve the above technical problems, a ceramic continuous light curing 3D printing method based on infrared light is provided, which is applied to a printing device, wherein the printing device comprises a molding platform, a printing platform, a stirring device and a light source device, and the molding platform is formed with a molding groove;

[0007] The method comprises:

[0008] S1, mixing ceramic slurry and upconversion material to prepare a light-cured ceramic material;

[0009] S2, filling the light-cured ceramic material into the molding groove;

[0010] S3, moving the printing platform to a preset position and starting a stirring device;

[0011] S4, the light source device emits near-infrared light to irradiate the photocurable ceramic material to stimulate the up-conversion material to emit ultraviolet light, and at the same time, the molding platform rotates relative to the printing platform.

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

[0013] Furthermore, the viscosity of the ceramic slurry is in the range of [1, 10] Pa·s.

[0014] Furthermore, in the photocurable ceramic material, the up-conversion material is added in an amount of 0.1%-10%.

[0015] Furthermore, the photocurable ceramic material includes Yb, Er, Tm, Nd, Mn 2+ Cr 3+ , core-shell structure upconversion particles, and one or more 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 Mn 2+ Or, the light-cured ceramic material includes Cr 3+ ; Alternatively, the photocurable ceramic material comprises core-shell structure upconversion particles; Alternatively, the photocurable ceramic material comprises 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 100-1500 mm / min.

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

[0020] The second object of the present invention is to provide a printing device for implementing the above-mentioned infrared light-based ceramic continuous light curing 3D printing method, comprising:

[0021] A molding platform, comprising an enclosing side plate and a release plate connected to the enclosing side plate, wherein the enclosing side plate and the release plate enclose the molding groove;

[0022] A printing platform, disposed on a first side of the forming platform;

[0023] A stirring device, disposed on a first side of the molding platform and located beside the printing platform;

[0024] The light source device is disposed on the second side of the molding platform, and the printing platform and the light source device are arranged on the same vertical line.

[0025] Implementing the embodiments of the present invention will have the following beneficial effects:

[0026] The infrared light-based ceramic continuous photocuring 3D printing method in this embodiment utilizes the characteristics of good infrared light penetration and large penetration depth to irradiate the up-conversion material in the photocurable ceramic material at the interface. The up-conversion material emits ultraviolet light after being excited by infrared light, and the surface and deep curing of the ceramic slurry is achieved through ultraviolet light, thereby achieving continuous ceramic molding, so as to solve the problem that traditional ultraviolet light has shallow penetration and is difficult to achieve continuous photocuring of ceramics; in addition, the molding platform is rotated relative to the printing platform. On the first hand, it can accelerate the interface liquid replenishment and mass transfer, which is conducive to improving the continuous molding speed. On the second hand, it can avoid the ceramic slurry on the bottom surface of the molding tank from being overexposed and solidified to form solid residue, which affects the continuous curing. On the third hand, it can also promote the heat dissipation of the ceramic slurry and prevent over-curing; in addition, the stirring of the stirring device makes the flow of the photocurable ceramic material reduce the heat accumulation of the photopolymerization reaction in the molding area, thereby achieving high-speed photocuring 3D printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a flow chart of a ceramic continuous light curing 3D printing method based on infrared light according to an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the structure of a printing device according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the principle of continuous photocuring of ceramics based on infrared light according to an embodiment of the present invention.

[0031] Wherein: 100, printing device; 110, forming platform; 111, enclosing side plate; 112, release plate; 113, forming tank; 120, printing platform; 130, stirring device; 140, light source device; A, vertical line; X, first rotation center; Y, second rotation center;

[0032] 200, solidified part; 300, solidified layer; 400, liquid flow layer. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] Please refer to Figure 1-Figure 3 The embodiment of the present invention provides a ceramic continuous light curing 3D printing method based on infrared light, which is applied to a printing device 100, wherein the printing device 100 includes a molding platform 110, a printing platform 120, a stirring device 130 and a light source device 140, and the molding platform 110 is formed with a molding groove 113;

[0037] Methods include:

[0038] S1, mixing the ceramic slurry and the upconversion material to prepare a photocurable ceramic material; illustratively, the photocurable ceramic material at this time is in liquid state. The upconversion material is a material that can convert low-energy light (such as infrared light) into high-energy light (such as ultraviolet light or visible light). During the 3D printing process, an infrared light source irradiates the upconversion material in the ceramic slurry. After the upconversion material absorbs the energy of the infrared light, it emits ultraviolet light or visible light through the upconversion process. These high-energy lights can trigger the photocuring reaction of the photosensitive ceramic slurry, causing the slurry to change from liquid to solid, thereby realizing 3D printing.

[0039] S2, filling the light-curing ceramic material into the molding groove 113;

[0040] S3, moving the printing platform 120 to a preset position and starting the stirring device 130;

[0041] S4, the light source device 140 emits near-infrared light to irradiate the photocurable ceramic material to stimulate the up-conversion material to emit ultraviolet light, and at the same time, the molding platform 110 rotates relative to the printing platform 120. For example, please refer to Figure 3 In the process of photocuring using the printing device 100, in the direction from the printing platform 120 to the bottom of the molding groove 113, the photocured ceramic material sequentially forms a cured portion 200, a cured layer 300 and a liquid flow layer 400, wherein the cured layer 300 is connected to the cured portion 200, and the cured layer 300 is separated from the bottom of the molding groove 113 by a flowing liquid flow layer 400. The scheme of the present application utilizes infrared light to penetrate the ceramic slurry at the molding interface, and the upper conversion material is used as the energy medium, that is, the infrared light irradiates the upper conversion material inside the ceramic slurry, and the upper conversion material is excited by the infrared light and emits ultraviolet light, which indirectly realizes the ultraviolet induced deep curing of the ceramic slurry, and then realizes the continuous molding of ceramics. The present application aims at the shallow penetration depth of ultraviolet light, which makes it difficult to realize the continuous molding of high refractive index, difficult to penetrate and dark slurry, so near-infrared light is used. Because near-infrared light has high penetrability, it can enter the deeper position of the ceramic slurry, which is conducive to continuous photocuring.

[0042] Please refer to Figure 1 , Figure 2 and Figure 3In the present embodiment, the infrared light-based ceramic continuous photocuring 3D printing method utilizes the characteristics of good infrared light penetration and large penetration depth to irradiate the conversion material particles in the photocurable ceramic material at the interface. The conversion material particles emit ultraviolet light after being excited by infrared light, and the surface and deep curing of the ceramic slurry is achieved through ultraviolet light, thereby achieving continuous ceramic molding, so as to solve the problem that the traditional ultraviolet light has shallow penetration and is difficult to achieve continuous photocuring of ceramics; in addition, the molding platform 110 is rotated relative to the printing platform 120. On the one hand, it can accelerate the interface rehydration and mass transfer, which is conducive to the improvement of the continuous molding speed; on the other hand, it can avoid the ceramic slurry on the bottom surface of the molding groove 113 from being overexposed and solidified to form solid residue, which affects the continuous curing; on the third hand, it can also promote the heat dissipation of the ceramic slurry and prevent over-curing; in addition, the stirring of the stirring device 130 makes the flow of the photocurable ceramic material reduce the accumulation of heat of the photopolymerization reaction in the molding area, thereby achieving high-speed photocuring 3D printing.

[0043] In this solution, the rotation of the build platform 110 relative to the printing platform 120 can produce the following beneficial effects:

[0044] First, the contact time between the solidified layer 300 and the liquid flowing 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 solidified layer 300 and the liquid flowing layer 400 is reduced. This relative movement enables the solidified layer 300 to detach from the surface of the liquid flowing layer 400 more quickly during each rise, thereby reducing the residence time of the liquid flowing layer 400 on the surface of the solidified layer 300. This helps prevent the liquid flowing layer 400 from being over-cured on the surface of the solidified layer 300, forming solid residues and affecting the continuous curing process.

[0045] Second, relative motion can promote 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 the two. This flow layer can be replenished to the top of the solidified layer 300 more quickly, ensuring that the liquid flow layer 400 can be filled into the gap of the solidified layer 300 in time, thereby achieving continuous molding. The flowing liquid flow layer 400 can better fill the microscopic unevenness of the solidified layer 300 and improve the molding accuracy.

[0046] Third, the relative movement can reduce the adhesion between the solidified layer 300 and the bottom plate of the molding groove 113. When the bottom plate of the molding groove 113 and the printing platform 120 move relative to each other, the contact area between the solidified layer 300 and the bottom plate of the molding groove 113 is reduced, and the adhesion is also reduced. This makes it easier for the solidified layer 300 to detach from the bottom plate of the molding groove 113, reduces the adhesion between the solidified layer 300 and the bottom plate of the molding groove 113, and avoids the solidified layer 300 from forming solid residues on the bottom plate of the molding groove 113.

[0047] Fourth, relative motion can also promote heat dissipation. Infrared light has a thermal effect. Long-term exposure will cause the temperature of the liquid flow layer 400 to rise, affecting the curing effect. The relative movement of the bottom plate of the molding groove 113 and the printing platform 120 can drive the liquid flow layer 400 to flow, thereby promoting the dissipation of heat and preventing the liquid flow layer 400 from overheating and curing. At the same time, the stirring action of the stirring device 130 can also further promote heat dissipation and ensure that the liquid flow layer 400 is cured at a suitable temperature.

[0048] Fifth, relative motion can transform the solidification interface from "solid-liquid-solid" to "solid-liquid" interface. In traditional 3D printing, a "solid-liquid-solid" interface is usually formed between the solidified layer 300 and the liquid flow layer 400, that is, there are two solid interfaces between the solidified layer 300, the liquid flow layer 400 and the bottom plate of the molding groove 113. This interface structure easily leads to adhesion between the solidified layer 300 and the bottom plate of the molding groove 113, affecting continuous molding. Relative motion can reduce the contact between the solidified layer 300 and the bottom plate of the molding groove 113, forming a "solid-liquid" interface, that is, there is only one liquid interface between the solidified layer 300 and the liquid flow layer 400, which helps to reduce the adhesion between the solidified layer 300 and the bottom plate of the molding groove 113, and improve the speed and accuracy of continuous molding.

[0049] Sixth, relative motion can also prevent the ceramic slurry from settling. The ceramic slurry has a high viscosity and is prone to settling during the printing process, resulting in uneven printing. The relative motion of the bottom plate of the molding tank 113 and the printing platform 120 can drive the ceramic slurry to flow, prevent settling, ensure that the ceramic slurry is always evenly distributed during the printing process, and improve the printing quality.

[0050] In one possible implementation, the ceramic slurry includes one or more of silicon oxide, aluminum oxide, zirconium oxide, silicon carbide, silicon nitride, magnesium oxide, tricalcium phosphate, and titanium carbide.

[0051] In a possible implementation, the viscosity of the ceramic slurry ranges from [1, 10] Pa·s. For example, 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.

[0052] In a possible embodiment, in the photocurable ceramic material, the addition ratio of the up-conversion material is 0.1%-10%. Exemplarily, the addition ratio of the up-conversion material is 0.1%-10%, and this range is obtained through experimental optimization to ensure the best balance between the photocuring effect and the material performance. When the addition ratio of the up-conversion material is small, although photocuring can be achieved, the up-conversion efficiency is relatively low, and the intensity of the ultraviolet light or visible light emitted is weak, resulting in a slow photocuring speed. When the addition ratio of the up-conversion material is high, the up-conversion efficiency is improved, the intensity of the ultraviolet light or visible light emitted is enhanced, and the photocuring speed is accelerated. However, too high an addition ratio may increase the viscosity of the ceramic slurry, affecting its fluidity and printing accuracy; at the same time, too much up-conversion material may absorb too much infrared light energy, resulting in local overheating, affecting the quality and performance of the print. Preferably, in this embodiment, the addition ratio of the up-conversion material is 2.5%. Of course, in specific applications, the addition ratio of the up-conversion material can also be set to 3%, or 1%, or 2%, or 4%, or 5%, or 6%, or 7%, or 8%, or 9%.

[0053] In a possible embodiment, the photocurable ceramic material includes Yb, Er, Tm, Nd, Mn 2+ Cr 3+ , core-shell structure upconversion particles, and one or more organic-inorganic hybrid upconversion materials.

[0054] In a 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 Mn 2+ ; Alternatively, the light-curing ceramic material includes Cr 3+; or, the photocurable ceramic material includes core-shell structure upconversion particles; or, the photocurable ceramic material includes organic-inorganic hybrid upconversion materials. Exemplarily, there are multiple implementations of photocurable ceramic materials. The first implementation is a ytterbium (Yb) and erbium (Er) doping system. The upconversion particles of this system usually have a high upconversion efficiency and can effectively convert infrared light into ultraviolet light or visible light. The particle size is between 10-50nm. The smaller particle size helps to improve the dispersibility of the particles in the ceramic slurry and reduce light scattering, thereby improving the photocuring efficiency. The mixing ratio is generally between 0.1% and 10%, and the specific ratio needs to be optimized according to the viscosity of the slurry and the photocuring speed. The second implementation is a ytterbium (Yb) and thulium (Tm) doping system. The upconversion particles of this system have a larger particle size, usually between 20-80nm. A larger particle size may cause increased light scattering, but it may also improve the 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 is a neodymium (Nd) doped system. The particle size of the neodymium-doped upconversion particles is mostly around 30-60nm, with good stability and upconversion efficiency. The selection of the mixing ratio needs to consider the light absorption characteristics of the neodymium doped system and the light curing requirements of the ceramic slurry, which is generally between 0.1% and 10%. The fourth implementation is manganese (Mn 2+ ) doping system, the particle size range of manganese-doped upconversion particles is relatively wide, 10-100nm. This system has a high upconversion efficiency, but the larger particle size may cause the slurry viscosity to increase. The mixing ratio needs to be optimized according to the light absorption characteristics of the manganese-doped system and the fluidity of the slurry, usually between 0.1% and 10%. The fifth implementation method is chromium (Cr 3+) doping system, the chromium-doped upconversion particles have a smaller particle size, generally 5-50nm. Smaller particle size helps to improve the dispersibility of particles in the slurry and reduce light scattering. The mixing ratio is generally between 0.1% and 10%, and the specific ratio needs to be adjusted according to the light absorption characteristics and photocuring effect of the chromium-doped system. The sixth implementation method is a core-shell structure upconversion particle, which has a core-shell structure, a particle size of the core part of 10-50nm, and a shell thickness of about a few nanometers to more than ten nanometers. The core-shell structure can improve the stability and upconversion efficiency of the particles. The mixing ratio needs to be optimized according to the characteristics of the core-shell structure particles and the photocuring requirements of the slurry, usually between 0.1% and 10%. The core-shell structure upconversion particle is a nanomaterial with a special structure, consisting of a core part and a shell part. The core part is usually composed of rare earth-doped inorganic nanomaterials, such as fluorides, oxides or phosphates doped with ytterbium (Yb), erbium (Er), thulium (Tm), neodymium (Nd), etc. The core part is responsible for absorbing infrared light and up-converting it to emit ultraviolet light or visible light. These rare earth ions have a unique electronic energy level structure that can effectively absorb infrared light and convert it into high-energy light. The shell part is usually composed of inorganic materials (such as silica, alumina, etc.) or organic materials (such as polymers). The shell can protect the core part from erosion by environmental factors (such as water, oxygen, chemical reagents, etc.), thereby improving the stability and service life of the particles. The seventh embodiment is an organic-inorganic hybrid up-conversion material, which has a wide range of particle sizes. The inorganic up-conversion nanoparticle part is usually 5-30nm, and the size of the organic part depends on the specific organic material and the synthesis method. The particle size of the overall hybrid particle may be between 50-300nm. The organic-inorganic hybrid structure can improve the dispersibility and photocuring efficiency of the particles. The mixing ratio needs to be adjusted according to the characteristics of the hybrid material and the performance requirements of the slurry, generally between 0.1% and 10%. The organic-inorganic hybrid up-conversion material is a composite material combining organic materials and inorganic up-conversion nanoparticles. Inorganic upconversion nanoparticles are usually composed of rare earth-doped inorganic nanomaterials, such as fluorides, oxides or phosphates doped with ytterbium (Yb), erbium (Er), thulium (Tm), neodymium (Nd), etc. Inorganic upconversion nanoparticles are responsible for absorbing infrared light and upconverting it to emit ultraviolet light or visible light. These rare earth ions have a unique electronic energy level structure that can 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 composite materials and prevent particle agglomeration.

[0055] Please refer to Figure 2In 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 the present application, during the printing process, the stirring device 130 in the molding tank 113 rotates (rotation speed 5-100 rpm), which will drive the light-cured ceramic material to flow, resulting in no solidification between the light-cured ceramic material and the release plate 112. The solidification interface is transformed from a "solid-liquid-solid" interface to a "solid-liquid" interface, which is beneficial to the demolding force of the part solidification interface and the coating of the release plate 112, preventing the ceramic slurry from precipitating and eliminating solidification residues. At the same time, since near-infrared light generates a large amount of heat, the stirring of the stirring device 130 and the relative movement between the light-cured ceramic material and the release plate 112 will promote the heat dissipation of the printing process, thereby achieving continuous solidification.

[0056] Please refer to Figure 3 In a 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.

[0057] In a possible implementation, the wavelength of the near infrared light is set to be between 700-1200 nm. Exemplarily, the wavelength of the near infrared light can be set to 800 nm, or 900 nm, or 1000 nm, or 1100 nm.

[0058] Please refer to Figure 2 and Figure 3The second object of the present invention is to provide a printing device 100 for implementing the above-mentioned infrared light-based ceramic continuous light curing 3D printing method, including a molding platform 110, a printing platform 120, a stirring device 130 and a light source device 140. The molding platform 110 includes an enclosing side plate 111 and a release plate 112 connected to the enclosing side plate 111, and the enclosing side plate 111 and the release plate 112 enclose to form a molding groove 113. The printing platform 120 is arranged on the first side of the molding platform 110; the stirring device 130 is arranged on the first side of the molding platform 110 and is located next to the printing platform 120; the light source device 140 is arranged on the second side of the molding platform 110, and the printing platform 120 and the light source device 140 are arranged on the same vertical line A. Exemplarily, the stirring device 130 uses a small stirrer, 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 amount (H2O) of 0.05-50L, and a processing viscosity of 100000CP. The release plate 112 uses a transparent material for infrared light, including various glasses, silicon oxide, organic glass, polymethyl methacrylate, high molecular polyethylene, silicone film, and fluorinated film. Specifically, in this embodiment, the release plate 112 is an organic glass plate with a thickness of 2mm, and near-infrared light can penetrate the organic glass plate well.

[0059] Please refer to Figure 2 and Figure 3 Further, the printing platform 120 and the stirring device 130 are arranged above the molding platform 110, and the light source device 140 is arranged below the molding platform 110, and the central axis of the light source device 140 coincides with the central axis of the printing platform 120. The stirring device 130 rotates around the first rotation center X, and the molding platform 110 rotates around the second rotation center Y, and the first rotation center X and the second rotation center Y coincide. The stirring device 130 and the molding platform 110 rotate in opposite directions. For example, the stirring device 130 rotates in a clockwise direction, and the molding platform 110 rotates in a counterclockwise direction. The stirring device 130 rotates in a clockwise direction, thereby driving the light-cured ceramic material to rotate in a clockwise direction, and the molding platform 110 rotates in a counterclockwise direction. The opposite rotation direction is conducive to further increasing the relative movement between the light-cured ceramic material and the release plate 112, thereby further reducing the contact time between the solidified layer 300 and the liquid flow layer 400, further promoting the flow of the liquid flow layer 400, further reducing the adhesion between the solidified 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 the other way around, with the stirring device 130 rotating in a counterclockwise direction and the molding platform 110 rotating in a clockwise direction.

[0060] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A ceramic continuous light curing 3D printing method based on infrared light, applied in a printing device, characterized in that: The printing device comprises a molding platform, a printing platform, a stirring device and a light source device, and the molding platform is formed with a molding groove; The method comprises: S1, mixing ceramic slurry and upconversion material to prepare a light-cured ceramic material; S2, filling the light-cured ceramic material into the molding groove; S3, moving the printing platform to a preset position and starting a stirring device; S4, the light source device emits near-infrared light to irradiate the photocurable ceramic material to stimulate the up-conversion material to emit ultraviolet light, and at the same time, the molding platform rotates relative to the printing platform.

2. The method for continuous photocuring 3D printing of ceramics based on infrared light according to claim 1, characterized in that: The ceramic slurry comprises one or more of silicon oxide, aluminum oxide, zirconium oxide, silicon carbide, silicon nitride, magnesium oxide, tricalcium phosphate, titanium carbon silicide, piezoelectric ceramics, and hydroxyapatite.

3. The infrared light-based ceramic continuous light curing 3D printing method according to claim 2, characterized in that: The viscosity of the ceramic slurry is in the range of [100, 3000] mPa·s.

4. The method for continuous photocuring 3D printing of ceramics based on infrared light according to claim 1, characterized in that: In the photocurable ceramic material, the up-conversion material is added in an amount of 0.1%-10%.

5. The method for continuous photocuring 3D printing of ceramics based on infrared light according to claim 1, characterized in that: The photocurable ceramic material includes one or more of Yb, Er, Tm, Nd, Mn2+, Cr3+, core-shell structure upconversion particles, and organic-inorganic hybrid upconversion materials.

6. The infrared light-based ceramic continuous light curing 3D printing method according to claim 1, characterized in that: 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 structure upconversion particles; or, the photocurable ceramic material includes organic-inorganic hybrid upconversion materials.

7. The method for continuous photocuring 3D printing of ceramics based on infrared light according to claim 1, characterized in that: 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.

8. The infrared light-based ceramic continuous light curing 3D printing method according to claim 1, characterized in that: 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 0.1-20 mm / s.

9. The infrared light-based ceramic continuous light curing 3D printing method according to claim 1, characterized in that: The wavelength of the near infrared light is set to be between 700-1200 nm.

10. A printing device for implementing the infrared light-based ceramic continuous light curing 3D printing method according to any one of claims 1 to 9, characterized in that: include: A molding platform, comprising an enclosing side plate and a release plate connected to the enclosing side plate, wherein the enclosing side plate and the release plate enclose the molding groove; A printing platform, disposed on a first side of the forming platform; A stirring device, disposed on a first side of the molding platform and located beside the printing platform; The light source device is disposed on the second side of the molding platform, and the printing platform and the light source device are arranged on the same vertical line.

Images