Alumina platelet adsorbed SiO2 photocuring printing nacre alumina composite ceramic and method

Abstract

The application discloses a method for printing nacreous alumina composite ceramic by photocuring of SiO2 adsorbed on alumina platelets, and particularly relates to the following steps: 1) uniformly dispersing SiO2 and alumina platelets in distilled water respectively, mixing the two solutions, and stirring the mixed solution by a magnetic stirrer to make the SiO2 and alumina platelets electrostatically adsorb on each other; 2) preparing alumina platelets adsorbed on SiO2; 3) preparing ceramic slurry; 4) irradiating the ceramic slurry by ultraviolet light, and rapidly solidifying the slurry in the exposed area by the ultraviolet light irradiation, so as to print out nacreous alumina composite ceramic blanks; and 5) debinding and sintering the printed ceramic blanks under a specific temperature curve. The method solves the problem that the current mullite composite alumina ceramic cannot be used to prepare a nacreous structure, and provides a new method for preparing a nacreous structure ceramic. The application further discloses a nacreous alumina composite ceramic printed by photocuring of SiO2 adsorbed on alumina platelets.

Description

Technical Field

[0001] The present invention belongs to the technical field of photocuring additive manufacturing of mother-of-pearl alumina composite ceramics, and specifically relates to photocuring printing of mother-of-pearl alumina composite ceramics based on the adsorption of SiO2 by alumina platelets, and also relates to a method for photocuring printing of mother-of-pearl alumina composite ceramics based on the adsorption of SiO2 by alumina platelets. Background Art

[0002] Alumina, a typical structural ceramic, boasts excellent properties such as high-temperature resistance, wear resistance, corrosion resistance, and good biocompatibility. It is currently widely used in industries such as biomedicine, aerospace, and automotive manufacturing. Alumina composite ceramics not only retain the original physical and chemical properties of alumina but also further enhance its mechanical properties. However, due to the inherent hardness and brittleness of alumina, its strength and toughness are mutually restricted, preventing a synergistic improvement, thus limiting its practical application.

[0003] Mullite is formed by the reaction of silicon dioxide and aluminum oxide at high temperatures. It has the advantages of high-temperature stability, high-temperature creep resistance, high-temperature mechanical properties and excellent chemical stability. However, its room-temperature mechanical properties are poor. Compounding it with aluminum oxide can make up for its shortcomings. Currently, existing technologies can prepare mullite-alumina composite ceramics, but there is no method to further regulate the microstructure of the material. The microstructure of many natural materials is very complex, with intricate microstructures at various scales, such as bamboo and mother-of-pearl. The microstructure of these materials can guide crack deflection and expansion and control fracture, resulting in strength and toughness that exceeds that of the materials they are composed of. In recent years, a large number of studies have combined biological structures with the preparation of ceramic materials to further improve the mechanical properties of ceramic materials. Among them, the biomimetic structure of mother-of-pearl has attracted the most attention. Summary of the Invention

[0004] The first objective of the present invention is to provide a method for photocuring and printing mother-of-pearl alumina composite ceramics based on SiO2 adsorbed by alumina platelets, which solves the current problem that silicon dioxide reacts with alumina at high temperatures to form mullite, thereby making it impossible to prepare mother-of-pearl structures in mullite composite alumina ceramics, and provides a new method for preparing mother-of-pearl structural ceramics.

[0005] The second object of the present invention is to provide a nacre-alumina composite ceramic based on light-curing printing of SiO2 adsorbed by alumina platelets.

[0006] The first technical solution adopted by the present invention is a method for printing mother-of-pearl alumina composite ceramics based on SiO2 adsorbed by alumina platelets and photocuring, comprising the following steps:

[0007] 1) SiO2 and alumina platelets were placed in a beaker of distilled water and dispersed evenly. The two solutions were then mixed and stirred with a magnetic stirrer to allow for sufficient electrostatic adsorption of the SiO2 and alumina platelets.

[0008] 2) The mixed solution is allowed to stand for stratification, after which the supernatant is removed and vacuum filtered, followed by drying in an oven; the dried ceramic powder is pre-sintered to obtain alumina platelets adsorbing SiO2;

[0009] 3) preparing ceramic slurry;

[0010] 4) Using a photocuring technique, the ceramic slurry prepared in step 3) is irradiated with ultraviolet light. The slurry flows, causing the alumina platelets adsorbed with SiO2 powder to align under shear force. The slurry in the exposed area is then rapidly cured by the UV light, thereby printing a mother-of-pearl alumina composite ceramic blank.

[0011] 5) The printed ceramic blank is degreased and sintered under a specific temperature curve. Silica reacts with alumina at high temperature to form mullite. The mullite structure is regularly distributed in layers along the direction of the alumina platelets, thus obtaining an alumina composite ceramic with a mother-of-pearl structure.

[0012] The present invention is also characterized in that:

[0013] In step 1), the composition ratio and mixing time of the aluminum oxide platelets adsorbing SiO2 are as follows: 0.5g-1.5g of silica is added to every 30ml of distilled water, and 1g-3g of aluminum oxide platelets is added to every 90ml of distilled water. The two solutions are then placed in an ultrasonic oscillator and mixed for 10-30 minutes. The two solutions are then mixed and stirred using a digital constant temperature magnetic stirrer for 2-3 hours.

[0014] The added SiO2 powder is a monodisperse spherical powder with a particle size of 70nm-300nm, an aluminum oxide platelet width of 4μm-15μm, and a thickness of 200nm-300nm.

[0015] In step 2), the standing time is about 30 minutes to 60 minutes; the adsorbed ceramic powder is dried at a drying temperature of 150° C. to 200° C. for 1 hour to 2 hours;

[0016] A box-type muffle furnace is used in the pre-sintering process, and the sintering process is: room temperature-1200℃ with a heating rate of 20℃ / min-60℃ / min; 1200℃-400℃ with a cooling rate of 1℃ / min-2℃ / min, keeping at 400℃ for 4h-6h, and then cooling with the furnace.

[0017] Step 3) is specifically as follows: first, two dispersants are added to the ceramic slurry liquid phase system and placed in a planetary ball mill for ball milling to completely dissolve the dispersants; then, spherical alumina particle powder and a sintering aid are added, and ball milling is continued until the alumina particles are evenly dispersed in the liquid phase; after removing the grinding balls, the alumina platelets adsorbed SiO2 powder prepared in step 2) are added and further dispersed evenly using the ball mill; then, an ultraviolet light initiator is added and stirred evenly, and finally, a defoaming treatment is performed under vacuum to obtain a mother-of-pearl alumina composite ceramic slurry.

[0018] In step 3), the ceramic slurry liquid phase system consists of 50-60 vol% of 1,6-hexanediol diacrylate accounting for 50-60 vol% of the total volume of the liquid phase, 30-35 vol% of polypropylene glycol 200 accounting for 30-35 vol% of the total volume of the liquid phase, 5-7.5 vol% of trimethylolpropane triacrylate accounting for 5-7.5 vol% of the total volume of the liquid phase, and 5-7.5 vol% of polyethylene glycol (400) diacrylate accounting for 5-7.5 vol% of the total volume of the liquid phase;

[0019] Or the ceramic slurry liquid phase system consists of 55-65 vol% of 1,6-hexanediol diacrylate accounting for the total volume of the liquid phase, 25-35 vol% of polypropylene glycol 400 accounting for the total volume of the liquid phase, and 5-10 vol% of trimethylolpropane triacrylate accounting for the total volume of the liquid phase;

[0020] The added spherical alumina particles are 15-30 vol% of the ceramic slurry and have a particle diameter of 1-3 μm; the added alumina platelets adsorbed SiO2 powder are 15-30 vol% of the ceramic slurry;

[0021] The sintering aids added are MgO and CaO accounting for 3 wt% of the SiO2 powder adsorbed by the alumina platelets, and the mass ratio of the mixture is 1:1;

[0022] The two dispersants added are CC42 accounting for 0.4-0.6wt% of the total weight of spherical alumina particle powder and alumina platelet adsorbed SiO2 powder and KD1 accounting for 2-3wt%, and the mixing ratio is 1:5; the ultraviolet light initiator added is TPO accounting for 2 wt% of the mass of the ceramic slurry liquid phase system; the ratio of the added grinding balls is 6-10 zirconia grinding balls with a diameter of 5mm-15mm per 50ml of slurry.

[0023] In step 4), the exposure time of the light-curing printing process is 3 s -8 s, the light-off time is 2 s -10 s, and the exposure power is 2.48 mW / cm 2 -7.95mW / cm 2 The thickness of each layer is 0.03 mm -0.08 mm, and the lifting speed of the workbench is 0.5 mm / s -1.5 mm / s.

[0024] In step 5), the degreasing process is divided into two parts: first, degreasing is performed under an argon atmosphere, and then degreasing is performed under an air atmosphere;

[0025] The debinding curve under argon atmosphere is as follows: starting from room temperature, heating at a rate of 0.2°C / min-0.5°C / min to 100°C-130°C and keeping the temperature for 600-700min, heating at a rate of 0.2°C / min-0.5°C / min to 220°C-250°C and keeping the temperature for 600-700min, heating at a rate of 0.2°C / min-0.5°C / min to 310°C-340°C and keeping the temperature for 600-700min, cooling at a rate of 2°C / min-4°C / min to 100°C, and then cooling with the furnace;

[0026] The degreasing curve in air atmosphere is as follows: starting from room temperature, heating up to 100℃-130℃ at a heating rate of 0.3-0.6℃ / min and keeping warm for 120 min-220min, heating up to 220℃-250℃ at a heating rate of 0.3℃ / min-0.6℃ / min and keeping warm for 120 min-220min, heating up to 310℃-340℃ at a heating rate of 0.3℃ / min-0.6℃ / min and keeping warm for 240 min-340min, heating up to 370℃-400℃ at a heating rate of 0.3℃ / min-0.6℃ / min and keeping warm for 240 min-340min, heating up to 600℃-700℃ at a heating rate of 0.5℃ / min-1℃ / min and keeping warm for 1500℃ at a heating rate of 2℃ / min The temperature was lowered to 100°C at a cooling rate of -4°C / min and then cooled in the furnace.

[0027] In step 5), sintering is carried out in an air atmosphere sintering furnace. The specific sintering curve is: room temperature-1200°C with a heating rate of 4°C / min-4.5°C / min, 1200°C-1650°C with a heating rate of 3°C / min-3.5°C / min, keeping at 1650°C for 120min-180min, cooling rate of 3°C / min-4°C / min from 1650°C to 1200°C, cooling rate of 4°C / min-5°C / min from 1200°C to 500°C, and then cooling with the furnace.

[0028] The second technical solution adopted by the present invention is to prepare mother-of-pearl alumina composite ceramics based on the photocuring printing of SiO2 by alumina platelets, which is prepared by the above-mentioned method.

[0029] The beneficial effects of the present invention are:

[0030] The method of the present invention allows silica particles to be attached to the surface of alumina platelets by electrostatic adsorption. The shear force generated by the flow of the slurry during photocuring 3D printing is then used to align the silica-adsorbed alumina platelets in a directional manner to produce mother-of-pearl alumina composite ceramics. After sintering the prepared ceramic green body, the silica particles react with the alumina at high temperature to form mullite, which is distributed in a regular lamellar pattern along the direction of the alumina platelets. This achieves the purpose of producing mother-of-pearl structures using mullite-composite alumina ceramics. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flow chart of the method of the present invention;

[0032] Figure 2 This is a scanning electron microscope image of the aluminum oxide platelets used in Example 1 of the method of the present invention;

[0033] Figure 3 is a scanning electron micrograph of silicon dioxide used in Example 1 of the method of the present invention;

[0034] Figure 4 This is a scanning electron microscope image of silicon dioxide adsorbed on aluminum oxide platelets prepared in Example 1 of the method of the present invention;

[0035] Figure 5 is a scanning electron microscope image of a cross section of the mother-of-pearl composite ceramic of Example 1 in the method of the present invention;

[0036] Figure 6 This is a scanning electron micrograph of silicon dioxide adsorbed on aluminum oxide platelets prepared in Example 3 of the method of the present invention;

[0037] Figure 7 This is a scanning electron microscope image of a cross section of the mother-of-pearl composite ceramic of Example 3 in the method of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] The present invention provides a method for printing mother-of-pearl alumina composite ceramics based on SiO2 adsorption by alumina platelets. Figure 1 As shown, the following steps are included:

[0040] 1) SiO2 and alumina platelets were placed in a beaker of distilled water and dispersed evenly. The two solutions were then mixed and stirred with a magnetic stirrer to allow for sufficient electrostatic adsorption of the SiO2 and alumina platelets.

[0041] In step 1), the ratio of the components of the aluminum oxide platelets adsorbing SiO2 and the mixing time are as follows: 0.5-1.5g of silicon dioxide is added to every 30ml of distilled water, and 1-3g of aluminum oxide platelets is added to every 90ml of distilled water. The two solutions are then placed in a DSA50-SK-1 ultrasonic oscillator and mixed for 10-30 minutes. The two solutions are then mixed and stirred for 2-3 hours using a digital constant temperature magnetic stirrer.

[0042] The added SiO2 powder is a monodisperse spherical powder with a particle size of 70-300nm, an alumina platelet width of 4-15μm, and a thickness of 200-300nm;

[0043] 2) The mixed solution is allowed to stand for stratification, after which the supernatant is removed and vacuum filtered, followed by drying in an oven; the dried ceramic powder is pre-sintered to obtain alumina platelets adsorbing SiO2;

[0044] In step 2), the standing time is about 30-60 minutes; the adsorbed ceramic powder is dried at a drying temperature of 150-200° C. for 1-2 hours;

[0045] The pre-sintering process uses a box-type muffle furnace, and the sintering process is as follows: room temperature-1200℃ with a heating rate of 20-60℃ / min; 1200℃-400℃ with a cooling rate of 1-2℃ / min, keeping at 400℃ for 4-6h, and then cooling with the furnace;

[0046] 3) Preparation of ceramic slurry: First, a ceramic slurry liquid phase system is prepared. Two dispersants are then added to the ceramic slurry liquid phase system and ball milled in a planetary ball mill to completely dissolve the dispersants. Spherical alumina particles and a sintering aid are then added and ball milling is continued until the alumina particles are evenly dispersed in the liquid phase. After removing the grinding balls, the alumina platelets prepared above, adsorbed SiO2 powder, are added and further dispersed in the ball mill. A UV light initiator is then added and stirred to uniformity. Finally, the mixture is defoamed under vacuum to obtain the mother-of-pearl alumina composite ceramic slurry.

[0047] In step 3), the ceramic slurry liquid phase system consists of 50-60 vol% of 1,6-hexanediol diacrylate accounting for the total volume of the liquid phase, 30-35 vol% of polypropylene glycol 200 accounting for the total volume of the liquid phase, 5-7.5 vol% of trimethylolpropane triacrylate accounting for the total volume of the liquid phase, and 5-7.5 vol% of polyethylene glycol (400) diacrylate accounting for the total volume of the liquid phase;

[0048] Or the ceramic slurry liquid phase system consists of 55-65 vol% of 1,6-hexanediol diacrylate accounting for the total volume of the liquid phase, 25-35 vol% of polypropylene glycol 400 accounting for the total volume of the liquid phase, and 5-10 vol% of trimethylolpropane triacrylate accounting for the total volume of the liquid phase;

[0049] The ceramic slurry liquid phase system is prepared by mixing the raw materials of the above formula.

[0050] The amount of spherical alumina particles added is 15-30 vol% of the ceramic slurry, and the particle diameter is 1-3 μm; the amount of alumina platelets adsorbing SiO2 powder added is 15-30 vol% of the ceramic slurry;

[0051] The sintering aids added were MgO and CaO accounting for 3 wt% of the SiO2 powder adsorbed by the alumina platelets, and the mass ratio of the mixture was 1:1;

[0052] The two dispersants added are CC42 accounting for 0.4-0.6wt% of the total weight of spherical alumina particle powder and alumina platelet adsorbed SiO2 powder and KD1 accounting for 2-3wt% of the total weight, and the mixing ratio is 1:5; the UV initiator added is TPO accounting for 2 wt% of the mass of the ceramic slurry liquid phase system.

[0053] The ratio of the added grinding balls is 6-10 zirconia grinding balls with a diameter of 5-15 mm per 50 ml of slurry.

[0054] 4) Using light-curing technology, the slurry flows, causing the alumina platelets adsorbed with SiO2 powder to be oriented under the action of shear force. UV light irradiation causes the slurry in the exposed area to quickly solidify, thereby printing a mother-of-pearl alumina composite ceramic blank;

[0055] In step 4), the exposure time of the light-curing printing process is 3-7s, the light-off time is 2-10s, and the exposure power is 2.48-7.95mW / cm 2 , the thickness of each layer is 0.03-0.08mm, and the lifting speed of the workbench is 0.5-1.5mm / s;

[0056] 5) The printed ceramic blank is degreased and sintered under a specific temperature curve. Silica reacts with alumina at high temperature to form mullite. The mullite structure is regularly distributed in layers along the direction of the alumina platelets, thus obtaining an alumina composite ceramic with a mother-of-pearl structure.

[0057] In step 5), the degreasing process is divided into two parts: first, degreasing is performed under an argon atmosphere, and then degreasing is performed under an air atmosphere;

[0058] The debinding curve under argon atmosphere is as follows: starting from room temperature, heating at a rate of 0.2-0.5°C / min to 100°C-130°C and keeping the temperature for 600-700min, heating at a rate of 0.2-0.5°C / min to 220°C-250°C and keeping the temperature for 600-700min, heating at a rate of 0.2-0.5°C / min to 310°C-340°C and keeping the temperature for 600-700min, cooling at a rate of 2-4°C / min to 100°C, and then cooling with the furnace;

[0059] The degreasing curve in air atmosphere is as follows: starting from room temperature, heating up to 100-130°C at a heating rate of 0.3-0.6°C / min and keeping warm for 120-220min; heating up to 220-250°C at a heating rate of 0.3-0.6°C / min and keeping warm for 120-220min; heating up to 310-340°C at a heating rate of 0.3-0.6°C / min and keeping warm for 240-340min; heating up to 370-400°C at a heating rate of 0.3-0.6°C / min and keeping warm for 240-340min; heating up to 600-700°C at a heating rate of 0.5-1°C / min and rising to 1000°C; cooling down to 100°C at a cooling rate of 2-4°C / min, and then cooling with the furnace;

[0060] The sintering was carried out in an air atmosphere sintering furnace. The specific sintering curve was as follows: a heating rate of 4-4.5°C / min from room temperature to 1200°C, a heating rate of 3-3.5°C / min from 1200°C to 1650°C, keeping at 1650°C for 120-180min, a cooling rate of 3-4°C / min from 1650°C to 1200°C, a cooling rate of 4-5°C / min from 1200°C to 500°C, and then cooling with the furnace.

[0061] The present invention also provides a nacre-alumina composite ceramic based on SiO2 adsorbed by alumina platelets and photocuring printing, which is prepared by the above method.

[0062] Example 1

[0063] 1) Add 0.5g of 300nm silica powder to 15ml of distilled water. In another clean beaker, add 2g of 10μm wide and 200nm thick alumina platelets to 90ml of distilled water. Place each in a DSA50-SK-1 ultrasonic oscillator and mix for 10 minutes. Then, mix the two evenly dispersed solutions and stir them for 2 hours using a digital constant temperature magnetic stirrer to ensure sufficient electrostatic adsorption between the alumina platelets and the silica.

[0064] 2) The solution prepared in step 1) was allowed to stand for 30 minutes. After the solution separated into layers, the supernatant was removed and vacuum filtered. After the filtration, the adsorbed ceramic powder was placed in an oven and kept at 150°C for 1 hour. The dried ceramic powder was then placed in a box-type muffle furnace and heated to 1200°C at a rate of 50°C / min. The temperature was then decreased to 400°C at a rate of 1.7°C / min and kept at that temperature for 4 hours, followed by furnace cooling.

[0065] 3) 1,6-hexanediol diacrylate (50 vol%), polypropylene glycol 200 (35 vol%), trimethylolpropane triacrylate (7.5 vol%), and polyethylene glycol (400) diacrylate (7.5 vol%) were mixed to prepare a ceramic slurry liquid phase system, and then 0.5 wt% of CC42 and 2.5 wt% of KD1 (based on the total weight of spherical alumina particle powder and alumina platelet adsorbed SiO2 powder) were added as dispersants, and then placed in a planetary ball mill for 6 hours to completely dissolve the dispersant; then spherical alumina (24.75 vol%) of the ceramic slurry was added. The granular powder (powder diameter of 1 μm) and MgO and CaO (MgO:CaO mass ratio of 1:1) accounting for 3 wt% of the alumina platelet-adsorbed silica powder as sintering aids are ball-milled for 2 hours to achieve uniform dispersion; then, the grinding balls are removed, and the alumina platelet-adsorbed SiO2 powder prepared in step 2) accounting for 20.25 vol% of the ceramic slurry prepared in step 2) is added and ball-milled for 2 hours to achieve uniform mixing; then, TPO accounting for 2 wt% of the mass of the ceramic slurry liquid phase system is added as a UV initiator and stirring is continued for 10 minutes. Finally, defoaming treatment is performed under vacuum to obtain a mother-of-pearl alumina composite ceramic slurry;

[0066] The ratio of the added grinding balls is 4 zirconia grinding balls with a diameter of 10 mm and 4 zirconia grinding balls with a diameter of 5 mm per 50 ml of slurry.

[0067] 4) Using the light-curing 3D printing technology, the prepared slurry was poured into the slurry tank of the printer. The flow of the slurry caused the alumina platelets adsorbed with SiO2 powder to be oriented under the action of shear force. The exposure time was 5s, the light off time was 2s, and the exposure power was 2.48 mW / cm 2 Under the irradiation of ultraviolet light, the ceramic slurry in the exposed area quickly solidifies and adheres to the printing platform. The thickness of each layer is 0.05mm. After each layer of pattern is exposed, the printing platform rises at a speed of 1mm / s, and then the next layer is exposed.

[0068] 5) Degreasing and sintering the printed ceramic blank. The degreasing process is divided into two parts: first, degreasing under argon atmosphere, and then degreasing under air atmosphere;

[0069] The debinding curve under argon atmosphere is as follows: starting from room temperature, heating at a rate of 0.2°C / min to 103°C and holding for 600 min, heating at a rate of 0.2°C / min to 220°C and holding for 600 min, heating at a rate of 0.2°C / min to 310°C and holding for 600 min, cooling at a rate of 2°C / min to 100°C, and then cooling with the furnace;

[0070] The debinding curve in air atmosphere is as follows: starting from room temperature, heating up to 103°C at a rate of 0.4°C / min and holding for 120 min; heating up to 220°C at a rate of 0.4°C / min and holding for 120 min; heating up to 310°C at a rate of 0.4°C / min and holding for 240 min; heating up to 370°C at a rate of 0.4°C / min and holding for 240 min; heating up to 600°C at a rate of 0.4°C / min; heating up to 1000°C at a rate of 0.7°C / min; cooling down to 100°C at a rate of 3°C / min, and then cooling with the furnace;

[0071] The sintering was carried out in an air atmosphere sintering furnace. The specific sintering curve was as follows: a heating rate of 4°C / min from room temperature to 1200°C, a heating rate of 3°C / min from 1200°C to 1650°C, keeping at 1650°C for 120 min, a cooling rate of 3°C / min from 1650°C to 1200°C, a cooling rate of 4°C / min from 1200°C to 500°C, and then cooling with the furnace.

[0072] from Figure 2 It can be seen that the alumina platelets have obvious lamellar structural characteristics and a large diameter-to-thickness ratio; Figure 3 It can be seen that silicon dioxide is a submicron spherical powder.

[0073] like Figure 4 The figure shows the SEM image of the aluminum oxide platelets prepared in Example 1 adsorbing silicon dioxide. It can be seen from the figure that the silicon dioxide particles are adsorbed on the surface of the aluminum oxide platelets by electrostatic adsorption. Figure 5 This is a scanning electron microscope image of a cross-section of a mother-of-pearl composite ceramic printed using photocuring additive manufacturing technology in Example 1. The image shows that alumina platelets react with SiO2 to form a lamellar mullite reinforcement with a high aspect ratio. Due to the Oswald effect, the resulting mullite structure retains the original platelet arrangement, forming a mother-of-pearl structure.

[0074] Example 2

[0075] 1) Add 0.5g of 150nm silica powder to a beaker containing 15ml of distilled water. In another clean beaker, add 2g of 10μm wide and 300nm thick alumina platelets to 90ml of distilled water. Place each in a DSA50-SK-1 ultrasonic oscillator and mix for 10 minutes. Then, mix the two evenly dispersed solutions and stir them for 2 hours using a digital constant temperature magnetic stirrer to ensure sufficient electrostatic adsorption between the alumina platelets and the silica.

[0076] 2) The solution prepared in step 1) was allowed to stand for 30 minutes. After the solution separated into layers, the supernatant was removed and vacuum filtered. After the filtration, the adsorbed ceramic powder was placed in an oven and kept at 150°C for 1 hour. The dried ceramic powder was then placed in a box-type muffle furnace and heated to 1200°C at a rate of 40°C / min. The temperature was then decreased to 400°C at a rate of 1.5°C / min and kept at that temperature for 4 hours, followed by cooling in the furnace.

[0077] Step 3 is the same as in Example 1;

[0078] 4) Using the light-curing 3D printing technology, the prepared slurry was poured into the slurry tank of the printer. The flow of the slurry made the alumina platelets adsorbed with SiO2 powder oriented under the action of shear force. The exposure time was 6s, the light off time was 3s, and the exposure power was 2.48 mW / cm 2 Under the irradiation of ultraviolet light, the ceramic slurry in the exposed area quickly solidifies and adheres to the printing platform. The thickness of each layer is 0.06mm. After each layer of pattern is exposed, the printing platform rises at a speed of 1mm / s, and then the next layer is exposed.

[0079] 5) Degreasing and sintering the printed ceramic blank. The degreasing process is divided into two parts: first, degreasing under argon atmosphere, and then degreasing under air atmosphere;

[0080] The debinding curve under argon atmosphere is as follows: starting from room temperature, heating at a rate of 0.3°C / min to 103°C and holding for 600 min, heating at a rate of 0.3°C / min to 220°C and holding for 600 min, heating at a rate of 0.3°C / min to 310°C and holding for 600 min, cooling at a rate of 2°C / min to 100°C, and then cooling with the furnace;

[0081] The debinding curve in air atmosphere is as follows: starting from room temperature, heating up to 103°C at a rate of 0.4°C / min and holding for 120 min; heating up to 220°C at a rate of 0.4°C / min and holding for 120 min; heating up to 310°C at a rate of 0.4°C / min and holding for 240 min; heating up to 370°C at a rate of 0.4°C / min and holding for 240 min; heating up to 600°C at a rate of 0.4°C / min; heating up to 1000°C at a rate of 0.7°C / min; cooling down to 100°C at a rate of 3°C / min, and then cooling with the furnace;

[0082] The sintering was carried out in an air atmosphere sintering furnace. The specific sintering curve was as follows: a heating rate of 4°C / min from room temperature to 1200°C, a heating rate of 3°C / min from 1200°C to 1650°C, keeping at 1650°C for 120 min, a cooling rate of 3°C / min from 1650°C to 1200°C, a cooling rate of 4°C / min from 1200°C to 500°C, and then cooling with the furnace.

[0083] Example 3

[0084] 1) Add 0.35g of 300nm silica powder to 15ml of distilled water. In another clean beaker, add 2g of 10μm wide and 250-300nm thick alumina platelets to 90ml of distilled water. Place each in a DSA50-SK-1 ultrasonic oscillator and mix for 10 minutes. Then, mix the two evenly dispersed solutions and stir them for 2 hours using a digital constant temperature magnetic stirrer to ensure sufficient electrostatic adsorption between the alumina platelets and the silica.

[0085] Step 2 is the same as in Example 2;

[0086] 3) 1,6-hexanediol diacrylate (60 vol%), polypropylene glycol 400 (30 vol%), and trimethylolpropane triacrylate (10 vol%) were mixed to prepare a ceramic slurry liquid phase system, and then 0.5 wt% of CC42 and 2.5 wt% of KD1 (based on the total weight of the spherical alumina particle powder and the alumina platelet adsorbed SiO2 powder) were added as dispersants. The mixture was then placed in a planetary ball mill and milled for 6 h to completely dissolve the dispersant. Then, 10 vol% of the ceramic slurry was added. 29.25 vol% spherical alumina particle powder (powder diameter of 3 μm) and MgO and CaO (the mass ratio of MgO to CaO is 1:1) accounting for 3 wt% of the alumina platelet-adsorbed silica powder as sintering aids are ball-milled for 2 hours to uniformly disperse them; then the grinding balls are removed, and the alumina platelet-adsorbed SiO2 accounting for 15.75 vol% of the ceramic slurry prepared in step 3) is added and ball-milled for 2 hours to uniformly mix them; finally, 2 wt% of TPO accounting for 2 wt% of the mass of the ceramic slurry liquid phase system is added as a UV initiator and stirring is continued for 10 minutes, and then defoaming treatment is performed under vacuum to obtain the ceramic slurry;

[0087] The ratio of the added grinding balls is 5 zirconia grinding balls with a diameter of 10 mm and 3 zirconia grinding balls with a diameter of 5 mm per 50 ml of slurry.

[0088] Step 4 is the same as in Example 2;

[0089] 5) Degreasing and sintering the printed ceramic blank. The degreasing process is divided into two parts: first, degreasing under argon atmosphere, and then degreasing under air atmosphere;

[0090] The debinding curve under argon atmosphere is as follows: starting from room temperature, heating at a rate of 0.2°C / min to 103°C and holding for 600 min, heating at a rate of 0.2°C / min to 220°C and holding for 600 min, heating at a rate of 0.2°C / min to 310°C and holding for 600 min, cooling at a rate of 2°C / min to 100°C, and then cooling with the furnace;

[0091] The debinding curve in air atmosphere is as follows: starting from room temperature, heating at a rate of 0.3℃ / min to 103℃ and holding for 120min; heating at a rate of 0.3℃ / min to 220℃ and holding for 120min; heating at a rate of 0.3℃ / min to 310℃ and holding for 240min; heating at a rate of 0.3℃ / min to 370℃ and holding for 240min; heating at a rate of 0.3℃ / min to 600℃; heating at a rate of 0.5℃ / min to 1000℃; cooling at a rate of 2℃ / min to 100℃; and then cooling with the furnace;

[0092] The sintering was carried out in an air atmosphere sintering furnace. The specific sintering curve was as follows: a heating rate of 4°C / min from room temperature to 1200°C, a heating rate of 3°C / min from 1200°C to 1650°C, keeping at 1650°C for 120 min, a cooling rate of 3°C / min from 1650°C to 1200°C, a cooling rate of 4°C / min from 1200°C to 500°C, and then cooling with the furnace.

[0093] like Figure 6 The figure shows a scanning electron microscope image of silicon dioxide adsorbed by the aluminum oxide platelets prepared in Example 3. Compared with Example 1, the amount of silicon dioxide adsorbed by the aluminum oxide platelets is reduced due to the reduced silicon dioxide content. Figure 7 This is a scanning electron microscope image of a cross section of a mother-of-pearl composite ceramic printed using the light-curing additive manufacturing technology in Example 3. Compared with Example 1, it can be seen that as the content of silicon dioxide adsorbed by the alumina platelets increases, the pores inside the ceramic increase and become larger.

[0094] Example 4

[0095] 1) Add 1g of 200nm silica powder to 20ml of distilled water. In another clean beaker, add 2g of 10μm wide and 200nm thick alumina platelets to 90ml of distilled water. Place each in a DSA50-SK-1 ultrasonic oscillator and mix for 20 minutes. Then, mix the two evenly dispersed solutions and stir them for 2 hours using a digital constant temperature magnetic stirrer to allow for sufficient electrostatic adsorption between the alumina platelets and the silica.

[0096] 2) The solution prepared in step 1) was allowed to stand for 30 minutes. After the solution separated into layers, the supernatant was removed and vacuum filtered. After filtration, the adsorbed ceramic powder was placed in an oven and kept at 150°C for 1 hour. The dried ceramic powder was then placed in a box-type muffle furnace and heated to 1200°C at a rate of 50°C / min, then the temperature was reduced to 400°C at a rate of 1.7°C / min and kept at that temperature for 4 hours, followed by furnace cooling.

[0097] Step 3 is the same as in Example 3;

[0098] 4) Using the light-curing 3D printing technology, the prepared slurry was poured into the slurry tank of the printer. The flow of the slurry caused the alumina platelets adsorbed with SiO2 powder to be oriented under the action of shear force. The exposure time was 6s, the light off time was 2s, and the exposure power was 2.48 mW / cm 2 Under the irradiation of ultraviolet light, the ceramic slurry in the exposed area quickly solidifies and adheres to the printing platform. The thickness of each layer is 0.07mm. After each layer of pattern is exposed, the printing platform rises at a speed of 1mm / s, and then the next layer is exposed.

[0099] Step 5 is the same as in Example 3;

[0100] The mother-of-pearl alumina composite ceramics printed by the method of the present invention have greatly improved strength and fracture toughness compared to traditional alumina ceramics. As the alumina platelets adsorb SiO2, pores will appear inside the ceramics, reducing the density. In addition, the strength and toughness of the printed mother-of-pearl alumina composite ceramics will also be different depending on the particle size of the adsorbed silica. Therefore, in practical applications, the appropriate particle size can be selected according to different scenarios.

[0101] Example 5

[0102] 1) Add 0.25g of 70nm silica powder to 15ml of distilled water. In another clean beaker, add 1g of 4μm wide and 200nm thick alumina platelets to 90ml of distilled water. Place each in a DSA50-SK-1 ultrasonic oscillator and mix for 10 minutes. Then, mix the two evenly dispersed solutions and stir them for 2 hours using a digital constant temperature magnetic stirrer to allow for sufficient electrostatic adsorption between the alumina platelets and the silica.

[0103] 2) The solution prepared in step 1) was allowed to stand for 30 minutes. After the solution separated into layers, the supernatant was removed and vacuum filtered. After the filtration, the adsorbed ceramic powder was placed in an oven and kept at 150°C for 1 hour. The dried ceramic powder was then placed in a box-type muffle furnace and heated to 1200°C at a rate of 20°C / min. The temperature was then decreased to 400°C at a rate of 1°C / min and kept at that temperature for 4 hours, followed by furnace cooling.

[0104] 3) 1,6-hexanediol diacrylate (50 vol%), polypropylene glycol 200 (35 vol%), trimethylolpropane triacrylate (7.5 vol%), and polyethylene glycol (400) diacrylate (7.5 vol%) were mixed to prepare a ceramic slurry liquid phase system, and then 0.4 wt% of CC42 and 2 wt% of KD1 (based on the total weight of spherical alumina particle powder and alumina platelet adsorbed SiO2 powder) were added as dispersants, and then the mixture was placed in a planetary ball mill and milled for 6 h to completely dissolve the dispersant. Then spherical alumina particles (20 vol%) of the ceramic slurry were added. The alumina platelet-adsorbed silica powder (powder diameter of 2 μm) and MgO and CaO (the mass ratio of MgO to CaO is 1:1) accounting for 3 wt% of the alumina platelet-adsorbed silica powder as sintering aids are ball-milled for 2 h to uniformly disperse them; then the grinding balls are removed, and the alumina platelet-adsorbed SiO2 powder accounting for 30 vol% of the ceramic slurry prepared in step 2) is added and ball-milled for 2 h to uniformly mix them; then, TPO accounting for 2 wt% of the mass of the ceramic slurry liquid phase system is added as a UV initiator and stirring is continued for 10 min. Finally, defoaming treatment is performed under vacuum to obtain the mother-of-pearl alumina composite ceramic slurry;

[0105] The ratio of the added grinding balls is 8 zirconia grinding balls with a diameter of 15 mm per 50 ml of slurry.

[0106] 4) Using the light-curing 3D printing technology, the prepared slurry was poured into the slurry tank of the printer. The flow of the slurry caused the alumina platelets adsorbed with SiO2 powder to be oriented under the action of shear force. The exposure time was 3s, the light off time was 2s, and the exposure power was 2.48 mW / cm 2 Under the irradiation of ultraviolet light, the ceramic slurry in the exposed area quickly solidifies and adheres to the printing platform. The thickness of each layer is 0.08mm. After each layer of pattern is exposed, the printing platform rises at a speed of 0.5mm / s, and then the next layer is exposed.

[0107] 5) Degreasing and sintering the printed ceramic blank. The degreasing process is divided into two parts: first, degreasing under argon atmosphere, and then degreasing under air atmosphere;

[0108] The debinding curve under argon atmosphere is as follows: starting from room temperature, heating up to 100°C at a rate of 0.2°C / min and holding for 600 min, heating up to 220°C at a rate of 0.2°C / min and holding for 600 min, heating up to 310°C at a rate of 0.2°C / min and holding for 600 min, cooling down to 100°C at a rate of 2°C / min, and then cooling with the furnace;

[0109] The debinding curve in air atmosphere is as follows: starting from room temperature, heating up to 100°C at a rate of 0.3°C / min and keeping warm for 120 min; heating up to 220°C at a rate of 0.3°C / min and keeping warm for 120 min; heating up to 310°C at a rate of 0.3°C / min and keeping warm for 240 min; heating up to 370°C at a rate of 0.3°C / min and keeping warm for 240 min; heating up to 600°C at a rate of 0.3°C / min; heating up to 1000°C at a rate of 0.5°C / min; cooling down to 100°C at a rate of 2°C / min, and then cooling with the furnace;

[0110] The sintering was carried out in an air atmosphere sintering furnace. The specific sintering curve was as follows: a heating rate of 4°C / min from room temperature to 1200°C, a heating rate of 3°C / min from 1200°C to 1650°C, keeping at 1650°C for 120 min, a cooling rate of 3°C / min from 1650°C to 1200°C, a cooling rate of 4°C / min from 1200°C to 500°C, and then cooling with the furnace.

[0111] Example 6

[0112] 1) Add 0.5g of 185nm silica powder to 15ml of distilled water. In another clean beaker, add 2g of 10μm wide and 250nm thick alumina platelets to 90ml of distilled water. Place each in a DSA50-SK-1 ultrasonic oscillator and mix for 20 minutes. Then, mix the two evenly dispersed solutions and stir them for 2.5 hours using a digital constant temperature magnetic stirrer to allow for sufficient electrostatic adsorption between the alumina platelets and the silica.

[0113] 2) The solution prepared in step 1) was allowed to stand for 45 minutes. After the solution separated into layers, the supernatant was removed and vacuum filtered. After the filtration, the adsorbed ceramic powder was placed in an oven and kept at 175°C for 1.5 hours. The dried ceramic powder was then placed in a box-type muffle furnace and heated to 1200°C at a rate of 40°C / min. The temperature was then decreased to 400°C at a rate of 1.5°C / min and kept at this temperature for 5 hours, followed by furnace cooling.

[0114] 3) 1,6-hexanediol diacrylate (55 vol%), polypropylene glycol 200 (35 vol%), trimethylolpropane triacrylate (5 vol%), and polyethylene glycol (400) diacrylate (5 vol%) were mixed to prepare a ceramic slurry liquid phase system, and then 0.5 wt% of CC42 and 2.5 wt% of KD1 (based on the total weight of the spherical alumina particle powder and the alumina platelet adsorbed SiO2 powder) were added as dispersants, and then the mixture was placed in a planetary ball mill and milled for 6 h to completely dissolve the dispersant. Then, 25 vol% of the ceramic slurry was added. Spherical alumina particle powder (powder particle diameter of 2 μm) and MgO and CaO accounting for 3 wt% of the alumina platelet-adsorbed silica powder as sintering aids are ball-milled for 2 hours to uniformly disperse them; then the grinding balls are removed, and the alumina platelet-adsorbed SiO2 accounting for 25 vol% of the ceramic slurry prepared in step 2) is added and ball-milled for 2 hours to uniformly mix them; then, TPO accounting for 2 wt% of the mass of the ceramic slurry liquid phase system is added as a UV initiator and stirring is continued for 10 minutes. Finally, defoaming treatment is performed under vacuum to obtain a mother-of-pearl alumina composite ceramic slurry;

[0115] The ratio of the added grinding balls was 10 zirconia grinding balls with a diameter of 8 mm per 50 ml of slurry.

[0116] 4) Using the light-curing 3D printing technology, the prepared slurry was poured into the slurry tank of the printer. The flow of the slurry caused the alumina platelets adsorbed with SiO2 powder to be oriented under the action of shear force. The exposure time was 5s, the light off time was 6s, and the exposure power was 5.22 mW / cm 2 Under the irradiation of ultraviolet light, the ceramic slurry in the exposed area quickly solidifies and adheres to the printing platform. The thickness of each layer is 0.06mm. After each layer of pattern is exposed, the printing platform rises at a speed of 1mm / s, and then the next layer is exposed.

[0117] 5) Degreasing and sintering the printed ceramic blank. The degreasing process is divided into two parts: first, degreasing under argon atmosphere, and then degreasing under air atmosphere;

[0118] The debinding curve under argon atmosphere is as follows: starting from room temperature, heating at a rate of 0.35°C / min to 115°C and holding for 650 min; heating at a rate of 0.35°C / min to 235°C and holding for 650 min; heating at a rate of 0.35°C / min to 325°C and holding for 650 min; cooling at a rate of 3°C / min to 100°C; and then cooling in the furnace;

[0119] The debinding curve in air atmosphere is as follows: starting from room temperature, heating at a rate of 0.45℃ / min to 115℃ and holding for 170min, heating at a rate of 0.45℃ / min to 235℃ and holding for 170min, heating at a rate of 0.45℃ / min to 325℃ and holding for 290min, heating at a rate of 0.45℃ / min to 385℃ and holding for 290min, heating at a rate of 0.45℃ / min to 650℃, heating at a rate of 0.75℃ / min to 1000℃, cooling at a rate of 3℃ / min to 100℃, and then cooling with the furnace;

[0120] The sintering was carried out in an air atmosphere sintering furnace. The specific sintering curve was as follows: a heating rate of 4.25°C / min from room temperature to 1200°C, a heating rate of 3.25°C / min from 1200°C to 1650°C, keeping at 1650°C for 150min, a cooling rate of 3.5°C / min from 1650°C to 1200°C, a cooling rate of 4.5°C / min from 1200°C to 500°C, and then cooling with the furnace.

[0121] Example 7

[0122] 1) Add 0.75g of 300nm silica powder to 15ml of distilled water. In another clean beaker, add 3g of 15μm wide and 300nm thick alumina platelets to 90ml of distilled water. Place each in a DSA50-SK-1 ultrasonic oscillator and mix for 30 minutes. Then, mix the two evenly dispersed solutions and stir them for 3 hours using a digital constant temperature magnetic stirrer to allow for sufficient electrostatic adsorption between the alumina platelets and the silica.

[0123] 2) The solution prepared in step 1) was allowed to stand for 60 minutes. After the solution separated into layers, the supernatant was removed and vacuum filtered. After the filtration was completed, the adsorbed ceramic powder was placed in an oven and kept at 200°C for 2 hours. The dried ceramic powder was then placed in a box-type muffle furnace and heated to 1200°C at a rate of 60°C / min. The temperature was then decreased to 400°C at a rate of 2°C / min and kept at this temperature for 6 hours, followed by cooling in the furnace.

[0124] 3) 1,6-hexanediol diacrylate (60 vol%), polypropylene glycol 200 (30 vol%), trimethylolpropane triacrylate (5 vol%), and polyethylene glycol (400) diacrylate (5 vol%) were mixed to prepare a ceramic slurry liquid phase system, and then 0.6 wt% of CC42 and 3 wt% of KD1 (based on the total weight of the spherical alumina particle powder and the alumina platelet adsorbed SiO2 powder) were added as dispersants, and then placed in a planetary ball mill for 6 hours to completely dissolve the dispersant; then 30 vol% of spherical alumina particle powder was added to the ceramic slurry. The powder (powder diameter is 1 μm) and MgO and CaO (the mass ratio of MgO to CaO is 1:1) accounting for 3 wt% of the alumina platelet-adsorbed silica powder as sintering aids are ball-milled for 2 hours to uniformly disperse them; then the grinding balls are removed, and the alumina platelet-adsorbed SiO2 accounting for 20 vol% of the ceramic slurry prepared in step 2) is added and ball-milled for 2 hours to uniformly mix them; then, TPO accounting for 2 wt% of the mass of the ceramic slurry liquid phase system is added as a UV initiator and stirring is continued for 10 minutes. Finally, defoaming treatment is carried out under vacuum to obtain mother-of-pearl alumina composite ceramic slurry;

[0125] The ratio of the added grinding balls was 6 zirconia grinding balls with a diameter of 5 mm per 50 ml of slurry.

[0126] 4) Using the light-curing 3D printing technology, the prepared slurry was poured into the slurry tank of the printer. The flow of the slurry made the alumina platelets adsorbed with SiO2 powder oriented under the action of shear force. The exposure time was 7s, the light off time was 10s, and the exposure power was 7.95 mW / cm 2 Under the irradiation of ultraviolet light, the ceramic slurry in the exposed area quickly solidifies and adheres to the printing platform. The thickness of each layer is 0.09mm. After each layer of pattern is exposed, the printing platform rises at a speed of 1.5mm / s to expose the next layer.

[0127] 5) Degreasing and sintering the printed ceramic blank. The degreasing process is divided into two parts: first, degreasing under argon atmosphere, and then degreasing under air atmosphere;

[0128] The debinding curve under argon atmosphere is as follows: starting from room temperature, heating at a rate of 0.5°C / min to 130°C and holding for 700 min, heating at a rate of 0.5°C / min to 250°C and holding for 700 min, heating at a rate of 0.5°C / min to 340°C and holding for 700 min, cooling at a rate of 4°C / min to 100°C, and then cooling with the furnace;

[0129] The debinding curve in air atmosphere is as follows: starting from room temperature, heating up to 130°C at a rate of 0.6°C / min and holding for 220 min; heating up to 250°C at a rate of 0.6°C / min and holding for 220 min; heating up to 340°C at a rate of 0.6°C / min and holding for 340 min; heating up to 400°C at a rate of 0.6°C / min and holding for 340 min; heating up to 700°C at a rate of 0.6°C / min; heating up to 1000°C at a rate of 1°C / min; cooling down to 100°C at a rate of 4°C / min, and then cooling with the furnace;

[0130] The sintering was carried out in an air atmosphere sintering furnace. The specific sintering curve was as follows: a heating rate of 4.5°C / min from room temperature to 1200°C, a heating rate of 3.5°C / min from 1200°C to 1650°C, keeping at 1650°C for 180 min, a cooling rate of 4°C / min from 1650°C to 1200°C, a cooling rate of 5°C / min from 1200°C to 500°C, and then cooling with the furnace.

Claims

1. A method for light-curing printing of mother-of-pearl alumina composite ceramics based on SiO2 adsorption by alumina platelets, characterized in that: The steps include: 1) Disperse SiO2 and alumina flakes evenly in distilled water, then mix the two solutions and stir to allow the SiO2 and alumina flakes to be fully electrostatically adsorbed; In step 1), the added SiO2 powder is a monodisperse spherical powder with a particle size of 70nm-300nm, an alumina platelet width of 4μm-15μm, and a thickness of 200nm-300nm; 2) The mixed solution is allowed to stand for stratification, after which the supernatant is removed and vacuum filtered, followed by drying in an oven; the dried ceramic powder is pre-sintered to obtain alumina platelets adsorbing SiO2; 3) preparing ceramic slurry; Step 3) specifically comprises: first, adding two dispersants to the ceramic slurry liquid phase system and placing it in a planetary ball mill to completely dissolve the dispersants; then, adding spherical alumina particle powder and a sintering aid, and continuing to ball mill until the alumina particles are evenly dispersed in the liquid phase; after removing the grinding balls, adding the alumina platelets adsorbed SiO2 powder prepared in step 2) and continuing to disperse it evenly in the ball mill; then, adding a UV initiator and stirring evenly, and finally defoaming under vacuum to obtain the mother-of-pearl alumina composite ceramic slurry; In step 3), the ceramic slurry liquid phase system consists of 50-60 vol% of 1,6-hexanediol diacrylate accounting for the total volume of the liquid phase, 30-35 vol% of polypropylene glycol 200 accounting for the total volume of the liquid phase, 5-7.5 vol% of trimethylolpropane triacrylate accounting for the total volume of the liquid phase, and 5-7.5 vol% of polyethylene glycol diacrylate accounting for the total volume of the liquid phase; Or the ceramic slurry liquid phase system consists of 55-65 vol% of 1,6-hexanediol diacrylate accounting for the total volume of the liquid phase, 25-35 vol% of polypropylene glycol 400 accounting for the total volume of the liquid phase, and 5-10 vol% of trimethylolpropane triacrylate accounting for the total volume of the liquid phase; The two dispersants added were CC42 (0.4-0.6 wt% of the total weight of the spherical alumina particles and the alumina platelets adsorbing SiO2) and KD1 (2-3 wt% of the total weight), with a mixing ratio of 1:

5. The UV initiator added was TPO (2 wt% of the mass of the ceramic slurry liquid phase system). The grinding balls added were 6-10 zirconia grinding balls with a diameter of 5 mm to 15 mm per 50 ml of slurry. 4) Using a photocuring technique, the ceramic slurry prepared in step 3) is irradiated with ultraviolet light. The slurry flows, causing the alumina platelets adsorbed with SiO2 powder to align under shear force. The slurry in the exposed area is then rapidly cured by the UV light, thereby printing a mother-of-pearl alumina composite ceramic blank. 5) Degreasing and sintering the printed ceramic blank under a specific temperature curve to obtain an alumina composite ceramic with a mother-of-pearl structure; In step 5), the degreasing process is divided into two parts: first, degreasing is performed under an argon atmosphere, and then degreasing is performed under an air atmosphere; The debinding curve under argon atmosphere is as follows: starting from room temperature, heating at a rate of 0.2°C / min-0.5°C / min to 100°C-130°C and keeping the temperature for 600-700min, heating at a rate of 0.2°C / min-0.5°C / min to 220°C-250°C and keeping the temperature for 600-700min, heating at a rate of 0.2°C / min-0.5°C / min to 310°C-340°C and keeping the temperature for 600-700min, cooling at a rate of 2°C / min-4°C / min to 100°C, and then cooling with the furnace; The degreasing curve in air atmosphere is as follows: starting from room temperature, heating up to 100℃-130℃ at a heating rate of 0.3-0.6℃ / min and keeping warm for 120 min-220min, heating up to 220℃-250℃ at a heating rate of 0.3℃ / min-0.6℃ / min and keeping warm for 120 min-220min, heating up to 310℃-340℃ at a heating rate of 0.3℃ / min-0.6℃ / min and keeping warm for 240 min-340min, heating up to 370℃-400℃ at a heating rate of 0.3℃ / min-0.6℃ / min and keeping warm for 240 min-340min, heating up to 600℃-700℃ at a heating rate of 0.5℃ / min-1℃ / min and keeping warm for 1500℃ at a heating rate of 2℃ / min The temperature was lowered to 100°C at a rate of -4°C / min and then cooled in the furnace; In step 5), sintering is carried out in an air atmosphere sintering furnace. The specific sintering curve is: room temperature-1200°C with a heating rate of 4°C / min-4.5°C / min, 1200°C-1650°C with a heating rate of 3°C / min-3.5°C / min, keeping at 1650°C for 120min-180min, cooling rate of 3°C / min-4°C / min from 1650°C to 1200°C, cooling rate of 4°C / min-5°C / min from 1200°C to 500°C, and then cooling with the furnace.

2. The method for photocuring printing of mother-of-pearl alumina composite ceramics based on alumina platelets adsorbing SiO2 according to claim 1, characterized in that: In step 1), the composition ratio and mixing time of the aluminum oxide flakes for adsorbing SiO2 are as follows: 0.5g-1.5g of silicon dioxide should be added to every 30ml of distilled water, and 1g-3g of aluminum oxide flakes should be added to every 90ml of distilled water. Then, the two solutions are placed in an ultrasonic oscillator and mixed for 10 min-30 min. The two solutions are then mixed and stirred for 2-3 hours using a digital constant temperature magnetic stirrer.

3. The method for photocuring printing of mother-of-pearl alumina composite ceramics based on alumina platelets adsorbing SiO2 according to claim 1, characterized in that: In step 2), the standing time is about 30 minutes to 60 minutes; the adsorbed ceramic powder is dried at a drying temperature of 150° C. to 200° C. for 1 hour to 2 hours; A box-type muffle furnace is used in the pre-sintering process, and the sintering process is: room temperature-1200℃ with a heating rate of 20℃ / min-60℃ / min; 1200℃-400℃ with a cooling rate of 1℃ / min-2℃ / min, keeping at 400℃ for 4h-6h, and then cooling with the furnace.

4. The method for photocuring printing of mother-of-pearl alumina composite ceramics based on alumina platelets adsorbing SiO2 according to claim 1, characterized in that: In step 3), the spherical alumina particles are added at 15-30 vol% of the ceramic slurry, and the particle diameter is 1-3 μm; the alumina platelets adsorbed SiO2 powder is added at 15-30 vol% of the ceramic slurry; The added sintering aids are MgO and CaO accounting for 3 wt% of the SiO2 powder adsorbed by the alumina platelets, and the mass ratio of the mixed materials is 1:

1.

5. The method for photocuring printing of mother-of-pearl alumina composite ceramics based on alumina platelets adsorbing SiO2 according to claim 1, characterized in that: In step 4), the exposure time of the light-curing printing process is 3 s -8 s, the light-off time is 2 s -10 s, and the exposure power is 2.48 mW / cm 2 -7.95mW / cm 2 The thickness of each layer is 0.03 mm -0.08 mm, and the lifting speed of the workbench is 0.5 mm / s -1.5 mm / s.

6. Based on the photocuring of SiO2 adsorbed by alumina platelets, mother-of-pearl alumina composite ceramics are printed, characterized in that: The method is prepared according to any one of claims 1 to 5.

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