CN116947518A - Fluorescent ceramic and preparation method and application thereof - Google Patents
Fluorescent ceramic and preparation method and application thereof Download PDFInfo
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- CN116947518A CN116947518A CN202310879771.1A CN202310879771A CN116947518A CN 116947518 A CN116947518 A CN 116947518A CN 202310879771 A CN202310879771 A CN 202310879771A CN 116947518 A CN116947518 A CN 116947518A
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Abstract
The invention provides fluorescent ceramic and a preparation method and application thereof. The fluorescent ceramic is internally distributed with whisker structures, the whisker length of the whisker structures is 5-20 mu m, and the distribution mass ratio of the whisker structures in the fluorescent ceramic is 2-6%. The whisker structure is at least one of aluminum nitride whisker or aluminum oxide whisker. On one hand, the whisker structure is utilized to effectively improve the heat conducting performance of the fluorescent ceramic, so that the fluorescent ceramic can conduct heat and dissipate heat more rapidly, and the whisker structure also increases the mechanical strength of the fluorescent ceramic; on the other hand, by introducing fine crystal particles, the invention can well exert the refraction and scattering of light, and meanwhile, the whisker structure can be mutually cooperated with the fine crystal particles, so that the refraction and scattering of light in fluorescent ceramics are further improved, the homogenization effect of an optical field is enhanced, and the light efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of illumination materials, and particularly relates to fluorescent ceramic, and a preparation method and application thereof.
Background
Compared with the traditional fluorescent powder packaging, the fluorescent ceramic has obvious heat resistance and heat conduction performance, can replace a fluorescent powder packaging device in a certain application scene, plays a role in stabilizing performance, has wide market application potential especially in the fields of laser illumination and the like, and is a hot spot direction of the development of the current technology. However, the current fluorescent ceramic products are important problems affecting the further application of the current products due to the structure and preparation characteristics of the fluorescent ceramic products.
Disclosure of Invention
The invention aims to improve the high thermal conductivity and the light field uniformity of fluorescent ceramics in the laser illumination application, and provides the fluorescent ceramics, and a preparation method and application thereof.
The invention provides a fluorescent ceramic, whisker structures are distributed in the fluorescent ceramic, the whisker length of the whisker structures is 5-20 mu m, and the distribution mass ratio of the whisker structures in the fluorescent ceramic is 2-6%.
The whisker structure is at least one of aluminum nitride whisker or aluminum oxide whisker.
The fluorescent ceramic also comprises fine crystal particles in the fluorescent ceramic, wherein the size of the fine crystal particles is within +/-15% of the excitation light wavelength of the fluorescent ceramic.
The fine-grain particles are AlO-based fine-grain particles.
The AlO-based fine crystal particles are MgAl 2 O 4 Fine crystal particles formed of at least one of alumina or AlON.
The fluorescent ceramic excitation light is any one of blue light, ultraviolet light, green light, near infrared light and infrared light.
The mass content of the fine crystal particles accounts for 5-15% of the total mass of the fluorescent ceramic.
The fluorescent ceramic can be any one of YAG fluorescent ceramic, gaYAG fluorescent ceramic, CASN fluorescent ceramic, SCASN fluorescent ceramic, LSN fluorescent ceramic, beta-sialon fluorescent ceramic and gamma-AlON fluorescent ceramic.
The preparation method of the fluorescent ceramic comprises the following steps:
(1) Weighing fluorescent ceramic matrix materials and whisker raw materials according to a preset proportion, placing the materials into a ball milling tank together with magnesium oxide, magnesium carbonate and tetraethoxysilane, and sequentially performing ball milling, drying and sieving to obtain ceramic matrix powder for tape casting;
(2) Mixing a dispersing agent and a solvent to prepare a premix;
(3) Adding the ceramic matrix powder prepared in the step (1) into the premix prepared in the step (2) for performing first ball milling, sequentially adding a plasticizer and a binder, and performing second ball milling to prepare ceramic slurry with the solid content of 45-55wt%;
(4) Injecting the ceramic slurry obtained in the step (3) into a trough of a casting machine for casting molding after foam removal by a foam removal machine, drying, solidifying and demolding at room temperature to obtain a casting film, and cutting and laminating the casting film and carrying out temperature isostatic pressing to obtain a biscuit with the thickness of 0.15-0.2 mm;
(5) And (3) performing glue discharging treatment on the biscuit obtained in the step (4) in a muffle furnace, calcining at 500-800 ℃ for 10-15 h in an air atmosphere, sintering the biscuit after glue discharging in a vacuum furnace, and finally annealing in the muffle furnace to obtain the fluorescent ceramic.
Preferably, in the step (1), the sintering aid is magnesium oxide and tetraethoxysilane, and the mass ratio of the magnesium oxide to the tetraethoxysilane is 1: (1-5), wherein the addition amount of the sintering aid is 0.1-0.5% of the total mass of the ceramic powder.
Preferably, in the step (2), the dispersing agent is any one or more of herring oil, ammonium acrylate or S502; the content of the dispersing agent is 0.5-1.0% of the content of the raw material powder; the solvent is one or more of water, toluene, alcohol and n-butanol;
preferably, in the step (3), the plasticizer is one or two of polyethylene glycol and glycerol, and the addition amount is 2.0-6.0% of the total mass of the ceramic powder; the binder is polyvinyl alcohol, and the addition amount is 3.0-6.0% of the total mass of the ceramic powder;
preferably, in the step (3), ball milling is carried out for 8-12 hours for the first time; ball milling is carried out for 12-18 h for the second time.
Preferably, in step (4), drying is performed at room temperature for 6 to 10 hours.
Preferably, in the step (4), the film is cut into a round shape with the diameter of 5-8 cm, the temperature isostatic pressing time is 10-20 min, the temperature is 70-80 ℃, and the pressure is 40-60 MPa.
Preferably, in the step (4), the vacuum pressure of the vacuum bubble removing machine is 0.2-1.0 KPa, and the bubble removing time is 1-2 min.
Preferably, in the step (5), the vacuum sintering temperature is 1650-1870 ℃, and the vacuum degree in the vacuum furnace chamber is kept at 10 -3 ~10 -4 Pa, sintering time is 15-20 h; the annealing temperature is 1200-1600 ℃ and the annealing time is 10-20 h.
A light emitting device comprising the fluorescent ceramic of any one of the preceding claims 1-8 and an excitation light source of the fluorescent ceramic.
A lighting device comprising the light emitting device of claim 10.
A projection apparatus comprising the light emitting device of claim 10.
Advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
according to the fluorescent ceramic, the whisker with a certain proportion is introduced into the fluorescent ceramic, so that on one hand, the heat conduction performance of the fluorescent ceramic is effectively improved by utilizing the whisker structure, more rapid heat conduction and heat dissipation can be realized, and the mechanical strength of the fluorescent ceramic is also improved by utilizing the whisker structure; on the other hand, by introducing fine crystal particles, the invention can well exert the refraction and scattering of light, and meanwhile, the whisker structure can be mutually cooperated with the fine crystal particles, so that the refraction and scattering of light in fluorescent ceramics are further improved, the homogenization effect of an optical field is enhanced, and the light efficiency is improved. In addition, the size of fine crystal particles in the fluorescent ceramic is equivalent to the size of the incident light wavelength of the excitation light, so that the refraction and scattering effects of the fine crystal refraction/scattering unit on the incident light are further improved, and the light field homogenization effect and the light efficiency are further improved.
The fluorescent ceramic comprises AlO-based fine crystal particles, and the raw material is preferably nano MgAl 2 O 4 The nanometer alumina or nanometer AlON forms fine crystal particles in the preparation process of the fluorescent ceramic, and the fine crystal particles cooperate with the whisker structure while playing the role of light field homogenization, so that the light field homogenization and the light efficiency are further improved, and the strength of the fluorescent ceramic matrix is simultaneously improved cooperatively. In the preparation process of the fluorescent ceramic, the magnesium oxide and the magnesium carbonate are added to mutually and cooperatively inhibit the rapid movement of the grain boundary in the sintering process, so that the effect of regulating and controlling the grain size is achieved.
The invention is found through researches that the crystal adjusting effect can be well achieved only by adding magnesium oxide and magnesium carbonate at the same time, and the effect is not obvious when one of the magnesium oxide and the magnesium carbonate is added singly.
Description of the embodiments
Example 1
YAG fluorescent ceramics are mainly prepared by the following steps:
(1) Accurately weighing 142.2g of yttrium oxide, 107.3g of aluminum oxide and 0.55g of cerium oxide according to a preset proportion, weighing 12.5g of aluminum nitride whisker and 1.25g of magnesium oxide, placing the accurately weighed components into a ball milling tank, ball milling for 12 hours, drying at 80 ℃ for 12 hours, and sieving with a 100-mesh sieve to obtain ceramic powder for tape casting;
(2) 1.25g of dispersant S502 and 120g of solvent deionized water are weighed and mixed to prepare a premix;
(3) Adding the powder prepared in the step (1) into the premix prepared in the step (2) for carrying out first ball milling for 12 hours, sequentially adding 32g of plasticizer PEG-200 and 40g of binder polyvinyl alcohol, and then carrying out second ball milling for 16 hours to prepare ceramic slurry with the solid content of 55 wt%;
(4) Removing bubbles from the ceramic slurry obtained in the step (3) by adopting a planetary vacuum bubble removing machine, wherein the vacuum pressure is 0.2-1.0 KPa, the bubble removing time is 2min, casting the ceramic slurry after bubble removal into a casting machine trough for molding, drying for 8h at room temperature, solidifying the slurry, demoulding to obtain a casting film, and cutting and laminating the casting film and carrying out warm isostatic pressing to obtain a biscuit with the thickness of 0.18 mm;
(5) Performing glue discharging treatment on the biscuit obtained in the step (4) in a muffle furnace, and calcining at 500-800 ℃ for 10-15 h in an air atmosphere; then placing the biscuit after glue discharging in a vacuum furnace for sintering at 1780 ℃ and preserving heat for 15 hours; finally, the ceramic is placed in a muffle furnace to be annealed for 10 hours at 1300 ℃ to obtain the fluorescent ceramic.
Comparative example 1, aluminum nitride whisker was not added, otherwise the same as in example 1
Example 2
YAG fluorescent ceramics are mainly prepared by the following steps:
(1) Accurately weighing 142.2g of yttrium oxide, 107.3g of aluminum oxide and 0.55g of cerium oxide according to a preset proportion, weighing 12.5g of aluminum nitride whisker, 1.25g of magnesium oxide and 0.73g of magnesium carbonate, placing the accurately weighed components into a ball milling tank, ball milling for 12 hours, drying at 80 ℃ for 12 hours, and sieving with a 100-mesh sieve to obtain ceramic powder for tape casting;
(2) 1.25g of dispersant S502 and 120g of solvent deionized water are weighed and mixed to prepare a premix;
(3) Adding the powder prepared in the step (1) into the premix prepared in the step (2) for carrying out first ball milling for 12 hours, sequentially adding 32g of plasticizer PEG-200 and 40g of binder polyvinyl alcohol, and then carrying out second ball milling for 16 hours to prepare ceramic slurry with the solid content of 55 wt%;
(4) Removing bubbles from the ceramic slurry obtained in the step (3) by adopting a planetary vacuum bubble removing machine, wherein the vacuum pressure is 0.2-1.0 KPa, the bubble removing time is 2min, casting the ceramic slurry after bubble removal into a casting machine trough for molding, drying for 8h at room temperature, solidifying the slurry, demoulding to obtain a casting film, and cutting and laminating the casting film and carrying out warm isostatic pressing to obtain a biscuit with the thickness of 0.18 mm;
(5) Performing glue discharging treatment on the biscuit obtained in the step (4) in a muffle furnace, and calcining at 500-800 ℃ for 10-15 h in an air atmosphere; then placing the biscuit after glue discharging in a vacuum furnace for sintering at 1780 ℃ and preserving heat for 15 hours; finally, the ceramic is placed in a muffle furnace to be annealed for 10 hours at 1300 ℃ to obtain the fluorescent ceramic.
Comparative example 2 was conducted in the same manner as in example 2 except that no aluminum nitride whisker was added.
Example 3
The LSN fluorescent ceramic is mainly prepared by the following steps:
(1) Accurately weighing 145.6g La according to a predetermined proportion 3 Si 6 N 11 :Ce 3+ The preparation method comprises the steps of (1) placing the fluorescent powder and 102.5g of aluminum oxide, weighing 8.5g of aluminum oxide whisker, 1.31g of magnesium oxide and 0.82g of magnesium carbonate in a ball milling tank, ball milling for 10 hours, drying at 80 ℃ for 11 hours, and sieving with a 100-mesh sieve to obtain ceramic powder for casting molding;
(2) 6.5g of dispersing agent S502 and 220g of solvent deionized water are weighed and mixed to prepare a premix;
(3) Adding the powder prepared in the step (1) into the premix prepared in the step (2) for carrying out first ball milling for 12 hours, sequentially adding 27g of plasticizer PEG-200 and 40g of binder polyvinyl alcohol, and then carrying out second ball milling for 16 hours to prepare ceramic slurry with the solid content of 50 wt%;
(4) Removing bubbles from the ceramic slurry obtained in the step (3) by adopting a planetary vacuum bubble removing machine, wherein the vacuum pressure is 0.5-1.0 KPa, the bubble removing time is 2min, casting the ceramic slurry after bubble removal into a casting machine trough for molding, drying for 8h at room temperature, solidifying the slurry, demoulding to obtain a casting film, and cutting and laminating the casting film and carrying out warm isostatic pressing to obtain a biscuit with the thickness of 0.22 mm;
(5) Performing glue discharging treatment on the biscuit obtained in the step (4) in a muffle furnace, and calcining at 600-800 ℃ for 10-15 h in an air atmosphere; then placing the biscuit after glue discharging in a vacuum furnace for sintering at 1850 ℃ and preserving heat for 15 hours; finally, the ceramic is placed in a muffle furnace to be annealed for 10 hours at 1300 ℃ to obtain the fluorescent ceramic.
Comparative example 3 was conducted in the same manner as in example 3 except that no alumina whisker was added.
Example 4
The preparation method of the LuAG fluorescent ceramic comprises the following steps:
(1) 138.6g Lu was precisely weighed in a predetermined ratio 2 O 3 Powder, 102.5g of alumina and 1.17g of cerium oxide, and 10.7g of alumina crystal were weighedPlacing 1.18g of magnesium oxide and 0.72g of magnesium carbonate into a ball milling tank, ball milling for 10 hours, drying at 80 ℃ for 11 hours, and sieving with a 100-mesh sieve to obtain ceramic powder for casting molding;
(2) 1.28g of dispersant S502 and 150g of solvent deionized water are weighed and mixed to prepare a premix;
(3) Adding the ceramic powder prepared in the step (1) into the premix prepared in the step (2) for performing first ball milling for 10 hours, sequentially adding 25g of plasticizer PEG-200 and 43g of binder polyvinyl alcohol, and performing second ball milling for 15 hours to prepare ceramic slurry with the solid content of 53 wt%;
(4) Removing bubbles from the ceramic slurry obtained in the step (3) by adopting a planetary vacuum bubble removing machine, wherein the vacuum pressure is 0.2-1.0 KPa, the bubble removing time is 2min, casting the ceramic slurry after bubble removal into a casting machine trough for molding, drying for 8h at room temperature, solidifying the slurry, demoulding to obtain a casting film, and cutting and laminating the casting film and carrying out warm isostatic pressing to obtain a biscuit with the thickness of 0.20 mm;
(5) Performing glue discharging treatment on the biscuit obtained in the step (4) in a muffle furnace, and calcining at 760-780 ℃ for 13h in an air atmosphere; then placing the biscuit after glue discharging in a vacuum furnace for sintering at 1820 ℃ for 15h; finally, the ceramic is placed in a muffle furnace to be annealed for 10 hours at 1300 ℃ to obtain the fluorescent ceramic.
Comparative example 4 was conducted in the same manner as in example 4 except that no alumina whisker was added.
Example 5
The preparation method of the CASN fluorescent ceramic comprises the following steps:
(1) 139.7g CaAlSiN is accurately weighed according to a preset proportion 3 :Eu 2+ The preparation method comprises the steps of (1) placing fluorescent powder and 108.6g of aluminum oxide, weighing 8.5g of aluminum nitride whisker, 1.31g of magnesium oxide and 0.82g of magnesium carbonate in a ball milling tank, ball milling for 10 hours, drying at 80 ℃ for 11 hours, and sieving with a 100-mesh sieve to obtain ceramic powder for casting molding;
(2) 7.1g of dispersant S502 and 240g of solvent deionized water are weighed and mixed to prepare a premix;
(3) Adding the powder prepared in the step (1) into the premix prepared in the step (2) for carrying out first ball milling for 12 hours, sequentially adding 33g of plasticizer PEG-200 and 43g of binder polyvinyl alcohol, and then carrying out second ball milling for 15 hours to prepare ceramic slurry with the solid content of 52 wt%;
(4) Removing bubbles from the ceramic slurry obtained in the step (3) by adopting a planetary vacuum bubble removing machine, wherein the vacuum pressure is 0.7-0.8 KPa, the bubble removing time is 3min, casting the ceramic slurry after bubble removal into a casting machine trough for molding, drying for 8h at room temperature, solidifying the slurry, demoulding to obtain a casting film, and cutting and laminating the casting film and carrying out temperature isostatic pressing to obtain a biscuit;
(5) Performing glue discharging treatment on the biscuit obtained in the step (4) in a muffle furnace, and calcining at 700-800 ℃ for 10-15 h in an air atmosphere; then placing the biscuit after glue discharging in a vacuum furnace for sintering at 1780 ℃ and preserving heat for 15 hours; finally, the ceramic is placed in a muffle furnace to be annealed at 1260 ℃ for 7 hours to obtain the fluorescent ceramic.
Comparative example 5 was conducted in the same manner as in example 5 except that no alumina whisker was added.
Example 6
YAG fluorescent ceramics are mainly prepared by the following steps:
(1) Accurately weighing 145.7g of yttrium oxide, 107.8g of aluminum oxide and 0.58g of cerium oxide according to a preset proportion, weighing 11.8g of aluminum nitride whisker, 1.2g of magnesium oxide and 8.6g of nano aluminum oxide (average particle size of 80 nm), placing the accurately weighed components into a ball milling tank, ball milling for 12 hours, drying at 80 ℃ for 12 hours, and sieving with a 100-mesh sieve to obtain ceramic powder for tape casting;
(2) 1.3g of dispersant S502 and 140g of solvent deionized water are weighed and mixed to prepare a premix;
(3) Adding the powder prepared in the step (1) into the premix prepared in the step (2) for carrying out first ball milling for 12 hours, sequentially adding 35g of plasticizer PEG-200 and 40g of binder polyvinyl alcohol, and then carrying out second ball milling for 16 hours to prepare ceramic slurry with the solid content of 55 wt%;
(4) Removing bubbles from the ceramic slurry obtained in the step (3) by adopting a planetary vacuum bubble removing machine, wherein the vacuum pressure is 0.6-0.8 KPa, the bubble removing time is 2min, casting the ceramic slurry after bubble removal into a casting machine trough for molding, drying for 8h at room temperature, solidifying the slurry, demoulding to obtain a casting film, and cutting and laminating the casting film and carrying out warm isostatic pressing to obtain a biscuit with the thickness of 0.18 mm;
(5) Performing glue discharging treatment on the biscuit obtained in the step (4) in a muffle furnace, and calcining at 650-700 ℃ for 13h in an air atmosphere; then placing the biscuit after glue discharging in a vacuum furnace for sintering at 1780 ℃ and preserving heat for 15 hours; finally, the ceramic is placed in a muffle furnace to be annealed for 10 hours at 1300 ℃ to obtain the fluorescent ceramic.
Example 7
The preparation method of the LuAG fluorescent ceramic comprises the following steps:
(1) 138.6g Lu was precisely weighed in a predetermined ratio 2 O 3 102.5g of alumina and 1.17g of cerium oxide, weighing 10.7g of alumina whiskers, 1.18g of magnesium oxide, 0.72g of magnesium carbonate and 6.6g of nano aluminum oxynitride (average particle size of 70 nm), placing the above components in a ball milling tank, ball milling for 10 hours, drying at 80 ℃ for 11 hours, and sieving with a 100-mesh sieve to obtain ceramic powder for tape casting;
(2) 1.28g of dispersant S502 and 150g of solvent deionized water are weighed and mixed to prepare a premix;
(3) Adding the ceramic powder prepared in the step (1) into the premix prepared in the step (2) for performing first ball milling for 10 hours, sequentially adding 25g of plasticizer PEG-200 and 43g of binder polyvinyl alcohol, and performing second ball milling for 15 hours to prepare ceramic slurry with the solid content of 53 wt%;
(4) Removing bubbles from the ceramic slurry obtained in the step (3) by adopting a planetary vacuum bubble removing machine, wherein the vacuum pressure is 0.2-1.0 KPa, the bubble removing time is 2min, casting the ceramic slurry after bubble removal into a casting machine trough for molding, drying for 8h at room temperature, solidifying the slurry, demoulding to obtain a casting film, and cutting and laminating the casting film and carrying out warm isostatic pressing to obtain a biscuit with the thickness of 0.20 mm;
(5) Performing glue discharging treatment on the biscuit obtained in the step (4) in a muffle furnace, and calcining at 760-780 ℃ for 13h in an air atmosphere; then placing the biscuit after glue discharging in a vacuum furnace for sintering at 1820 ℃ for 15h; finally, the ceramic is placed in a muffle furnace to be annealed for 10 hours at 1300 ℃ to obtain the fluorescent ceramic.
The resulting fluorescent ceramics were tested for properties as follows, with illuminance uniformity determined with reference to GT 004-2012:
fluorescent ceramic material | Power W | Light effect (lm/W) | Illuminance uniformity (%) | Thermal conductivity (w/m.k) |
Example 1 | 6 | 203 | 92 | 17 |
Comparative example 1 | 6 | 191 | 80 | 13 |
Example 2 | 10 | 213 | 92 | 17 |
Comparative example 2 | 10 | 193 | 81 | 13 |
Example 3 | 8 | 199 | 93 | 16 |
Comparative example 3 | 8 | 190 | 80 | 12 |
Example 4 | 12 | 196 | 91 | 17 |
Comparative example 4 | 12 | 188 | 81 | 13 |
Example 5 | 10 | 198 | 93 | 17 |
Comparative example 5 | 10 | 189 | 80 | 14 |
Example 6 | 6 | 208 | 94 | 18 |
Example 7 | 12 | 203 | 93 | 18 |
It can be seen from each example and the corresponding comparative example that by adding whiskers, the light efficiency, the illuminance uniformity and the heat conduction performance are remarkably improved.
Claims (14)
1. A fluorescent ceramic is characterized in that whisker structures are distributed in the fluorescent ceramic, the whisker length of the whisker structures is 5-20 mu m, and the distribution mass ratio of the whisker structures in the fluorescent ceramic is 2-6%.
2. The fluorescent ceramic of claim 1, wherein the whisker structure is at least one of aluminum nitride whiskers or aluminum oxide whiskers.
3. The fluorescent ceramic of claim 1, further comprising fine-grain particles within the fluorescent ceramic, wherein the fine-grain particles have a size within + -15% of the wavelength of the excitation light of the fluorescent ceramic.
4. A fluorescent ceramic as claimed in claim 3, wherein the fine-grained particles are AlO-based fine-grained particles.
5. The fluorescent ceramic of claim 4, wherein the AlO-based fine crystal particles are nano MgAl 2 O 4 At least one of nano aluminum oxide or nano AlONFine-grain particles of (3).
6. The fluorescent ceramic of claim 4, wherein nano MgAl 2 O 4 The average particle size of the nano aluminum oxide or the nano AlON is smaller than 100nm.
7. The fluorescent ceramic according to claim 3, wherein the excitation light of the fluorescent ceramic is any one of blue light, ultraviolet light, green light, near infrared light, and infrared light.
8. A fluorescent ceramic according to claim 3, wherein the mass content of the fine crystal particles is 5% -15% of the total mass of the fluorescent ceramic.
9. The fluorescent ceramic according to claim 1, wherein the fluorescent ceramic is any one of YAG fluorescent ceramic, gaYAG fluorescent ceramic, CASN fluorescent ceramic, SCASN fluorescent ceramic, LSN fluorescent ceramic, β -sialon fluorescent ceramic, γ -AlON fluorescent ceramic.
10. The method for preparing a fluorescent ceramic according to any one of the preceding claims 1-9, characterized by comprising the steps of:
(1) Weighing fluorescent ceramic matrix materials and whisker raw materials according to a preset proportion, placing the materials into a ball milling tank together with magnesium oxide, magnesium carbonate and tetraethoxysilane, and sequentially performing ball milling, drying and sieving to obtain ceramic matrix powder for tape casting;
(2) Mixing a dispersing agent and a solvent to prepare a premix;
(3) Adding the ceramic matrix powder prepared in the step (1) into the premix prepared in the step (2) for performing first ball milling, sequentially adding a plasticizer and a binder, and performing second ball milling to prepare ceramic slurry with the solid content of 45-55wt%;
(4) Injecting the ceramic slurry obtained in the step (3) into a trough of a casting machine for casting molding after foam removal by a foam removal machine, drying, solidifying and demolding at room temperature to obtain a casting film, and cutting and laminating the casting film and carrying out temperature isostatic pressing to obtain a biscuit with the thickness of 0.15-0.2 mm;
(5) And (3) performing glue discharging treatment on the biscuit obtained in the step (4) in a muffle furnace, calcining at 500-800 ℃ for 10-15 h in an air atmosphere, sintering the biscuit after glue discharging in a vacuum furnace, and finally annealing in the muffle furnace to obtain the fluorescent ceramic.
11. The method for preparing fluorescent ceramics according to claim 10, wherein in the step (1), the mass ratio of magnesium oxide, magnesium carbonate and ethyl orthosilicate is 1 (0.5-0.8): 1-5), and the addition amount of the three is 0.1-0.5% of the total mass of the ceramic powder.
12. A light emitting device comprising the fluorescent ceramic of any one of the preceding claims 1-8 and an excitation light source of the fluorescent ceramic.
13. A lighting device comprising the light emitting device of claim 12.
14. A projection apparatus comprising the light emitting device of claim 12.
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US20190363507A1 (en) * | 2016-11-15 | 2019-11-28 | Appotronics Corporation Limited | Light-emitting ceramic and light-emitting device |
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