CN115838295A - Silicon oxide ceramic slurry containing mullite whisker precursor and preparation method and application thereof - Google Patents
Silicon oxide ceramic slurry containing mullite whisker precursor and preparation method and application thereof Download PDFInfo
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- CN115838295A CN115838295A CN202211630516.5A CN202211630516A CN115838295A CN 115838295 A CN115838295 A CN 115838295A CN 202211630516 A CN202211630516 A CN 202211630516A CN 115838295 A CN115838295 A CN 115838295A
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- 239000002002 slurry Substances 0.000 title claims abstract description 52
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910052863 mullite Inorganic materials 0.000 title claims abstract description 38
- 239000002243 precursor Substances 0.000 title claims abstract description 35
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- 239000011224 oxide ceramic Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
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- 238000007639 printing Methods 0.000 claims description 14
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- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 8
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- GUCYFKSBFREPBC-UHFFFAOYSA-N [phenyl-(2,4,6-trimethylbenzoyl)phosphoryl]-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C(=O)C1=C(C)C=C(C)C=C1C GUCYFKSBFREPBC-UHFFFAOYSA-N 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
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- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 2
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- AZIQALWHRUQPHV-UHFFFAOYSA-N prop-2-eneperoxoic acid Chemical compound OOC(=O)C=C AZIQALWHRUQPHV-UHFFFAOYSA-N 0.000 claims description 2
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 claims description 2
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- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 7
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Images
Abstract
The invention provides silicon oxide ceramic slurry containing a mullite whisker precursor, and a preparation method and application thereof, wherein the silicon oxide ceramic slurry comprises ceramic powder and photosensitive resin premixed liquid, and the addition amount of the ceramic powder is 40-65% of the total volume of the slurry; the ceramic powder comprises the following raw materials in percentage by weight: quartz glass powder: 80-90wt%; mineralizing agent: 5-15wt%; aluminum fluoride: 3-12wt%; catalyst: 1-3wt%; the photosensitive resin premix comprises the following raw materials in percentage by weight: resin oligomer: 30-60wt%; resin monomer: 30-60wt%; photoinitiator (2): 2-4wt%; dispersing agent: 5-10wt%. The introduction of the mullite whiskers can improve the interlayer strength and shrinkage rate of the ceramic core.
Description
Technical Field
The invention belongs to the technical field of 3D printing, and particularly relates to silicon oxide ceramic slurry containing a mullite whisker precursor, and a preparation method and application thereof.
Background
The thick liquids of 3D printing ceramic core are heavily easily spread for guaranteeing to print the process, generally can design lower solid content, lead to shrink great after the sintering, and the while successive layer is printed and can lead to the intensity between the layer relatively poor. In order to solve the problem of poor interlayer strength, the mechanical property and the high-temperature property of the hot-pressing ceramic core are improved mainly by directly adding a mullite whisker strengthening phase into slurry at present. However, the method cannot be applied to 3D printing of the ceramic core, the scraper can scrape the whiskers and cannot achieve the effect of strengthening the interlayer, meanwhile, the viscosity is increased sharply due to the fact that fibers are directly added into the slurry, and the slurry is difficult to spread and cannot be used for printing.
Disclosure of Invention
In view of the above, the present invention provides a silica ceramic slurry containing a mullite whisker precursor, and a preparation method and an application thereof, aiming at overcoming the defects in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a silicon oxide ceramic slurry containing a mullite whisker precursor, which comprises ceramic powder and photosensitive resin premix, wherein the addition amount of the ceramic powder is 40-65% of the volume percentage of the photosensitive resin premix;
the ceramic powder comprises the following raw materials in percentage by weight:
quartz glass powder: 80-90wt%;
mineralizing agent: 5-15wt%;
aluminum fluoride: 3-12wt%;
catalyst: 2-4wt%;
the photosensitive resin premix comprises the following raw materials in percentage by weight:
resin oligomer: 30-60wt%;
resin monomer: 30-60wt%;
photoinitiator (2): 2-4wt%;
dispersing agent: 5-10wt%.
Preferably, the catalyst is vanadium pentoxide.
Preferably, the mineralizer is one or more of white corundum, zirconium silicate and cubic quartz.
Preferably, the resin oligomer is one or more of urethane acrylate, epoxy acrylate, polyester acrylate and hydroxyl acrylate.
Preferably, the resin monomer is one or more of isobornyl acrylate (IBOA), 1, 6-hexanediol diacrylate (HDDA), tripropylene glycol diacrylate (TPGDA), trimethylolpropane trimethacrylate (TMPTA) and dipropylene glycol diacrylate (DPGDA).
Preferably, the photoinitiator is one or more of 2,4, 6-trimethyl benzoyl phenyl ethyl phosphonate (TPO-L), phenyl bis (2, 4, 6-trimethyl benzoyl) phosphine oxide (819) and alpha-hydroxy cycloethyl benzophenone (184).
Preferably, the dispersant is one or more of oleic acid, stearic acid and BYK 111.
Preferably, the particle size of the quartz glass powder is 5-20 microns; the particle size of the mineralizer is 200-400 meshes.
Preferably, the fluidity of the silicon oxide ceramic slurry containing the mullite whisker precursor is less than or equal to 5000 mPas.
As a second aspect of the present invention, there is provided a method for preparing the above silica ceramic slurry containing a mullite whisker precursor, comprising the steps of:
(1) Mixing and uniformly stirring raw materials of the photosensitive resin premixed liquid to obtain photosensitive resin premixed liquid, and mixing and uniformly stirring raw materials of ceramic powder to obtain ceramic powder;
(2) Slowly adding the ceramic powder into the premixed liquid for multiple times, uniformly stirring, carrying out high-energy ball milling, and taking out;
(3) And (3) filtering and removing bubbles in vacuum of the slurry obtained by ball milling in the step (2), and finally obtaining the silicon oxide ceramic slurry containing the mullite whisker precursor.
The third aspect of the invention provides a silica-based ceramic core wet blank which is finally obtained after the excessive uncured slurry on the wet blank is removed by ultrasonic cleaning after the silica ceramic slurry is used as printing slurry and is cured layer by layer through a DLP3D printer.
As a fourth aspect of the present invention, there is provided a silica-based ceramic core prepared using the above silica-based ceramic core wet blank.
Preferably, the preparation method of the silica-based ceramic core comprises the following steps: and (3) loading the silica-based ceramic core wet blank into a burning pot containing alumina filler, and then putting the burning pot into a box type roasting furnace for roasting to obtain the silica-based ceramic core.
Preferably, the roasting process is as follows: heating to 200 ℃ at a heating rate of 0.1 ℃/min-2 ℃/min, heating to 400 ℃ at a heating rate of 0.1 ℃/min-2 ℃/min, heating to 900-1000 ℃ at a heating rate of 0.5 ℃/min-5 ℃/min, heating to 1120-1200 ℃ at a heating rate of 1 ℃/min-5 ℃/min, keeping the temperature for 4-8h, cooling to 900-1000 ℃ at a cooling rate of 0.5 ℃/min-1 ℃/min, and finally cooling to room temperature along with the furnace to obtain the silicon oxide-based ceramic core.
Compared with the prior art, the invention has the following advantages:
the mullite whisker grows in situ in the roasting process of the silica-based ceramic core wet blank prepared from the silica ceramic slurry containing the mullite whisker precursor, is used as a framework to block viscous flow of silica at high temperature and reduce shrinkage, and meanwhile, the strength in the printing direction is improved by utilizing the bonding of the interlayer whiskers, the layering effect is weakened, and the interlayer strength and the shrinkage rate of the ceramic core can be improved by introducing the mullite whisker.
Description of the drawings:
FIGS. 1-3 are scanning electron micrographs, in order, of the silica-based ceramic core prepared in example 1 at resolutions of 500nm, 100nm, and 20 nm;
FIGS. 4-5 are scanning electron micrographs, in sequence, of the silica-based ceramic core of example 2 at 20nm and 10nm resolution;
FIGS. 6-7 are scanning electron micrographs, in order, of the silica-based ceramic core prepared in example 3 at 20nm and 10nm resolution;
FIGS. 8-10 are scanning electron micrographs, in order, of the silica-based ceramic core prepared in comparative example 1 at 500nm, 100nm, and 20nm resolutions;
FIG. 11 is a scanning electron micrograph of a silica-based ceramic core made according to comparative example 2 at a resolution of 20 nm;
FIGS. 12-13 are scanning electron micrographs, in order, of the silica-based ceramic core prepared in comparative example 3 at 20nm and 10nm resolution.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, were all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The invention will be described in detail with reference to the following examples.
Example 1
(1) Preparation of silicon oxide ceramic slurry containing mullite whisker precursor
The addition amount of the ceramic powder is 56 percent of the total volume;
the ceramic powder comprises the following raw materials in percentage by weight: silica glass powder (particle size D50=7 μm): 82wt%; zirconium silicate (particle size 300 mesh): 5wt%; white corundum (particle size 300 mesh): 5wt%; aluminum fluoride (particle size 325 mesh): 6wt%; vanadium pentoxide (particle size 325 mesh): 2wt%; mixing the above materials uniformly.
The photosensitive resin premix comprises the following raw materials in percentage by weight: resin oligomer: 50wt% of urethane acrylate; resin monomer: IBOA 14wt%, HDDA 14wt%, TMPTA 14wt%; photoinitiator (2): TPO-L3 wt%; dispersing agent: BYK111 wt%, and mixing the above raw materials uniformly.
And mixing the ceramic powder with the photosensitive resin premixed solution, wherein the adding amount of the ceramic powder is 56 percent of the total volume, and preparing the silicon oxide ceramic slurry containing the mullite whisker precursor.
(2) Preparation of silica-based ceramic core
According to the printing parameters set by the thickness of the slicing layer, curing the silicon oxide ceramic slurry containing the mullite whisker precursor layer by layer in a DLP3D printer to obtain a ceramic core wet blank, and removing the redundant uncured slurry on the wet blank by ultrasonic cleaning;
and (3) putting the wet ceramic core into a burning pot containing alumina filler, and then putting the burning pot into a box type roasting furnace for roasting.
The roasting process comprises the following steps: heating to 260 ℃ at the heating rate of 1.2 ℃/min, preserving heat for 1h, heating to 360 ℃ at the heating rate of 0.25 ℃/min, preserving heat for 1h, heating to 520 ℃ at the heating rate of 0.25 ℃/min, preserving heat for 1h, heating to 1200 ℃ at the heating rate of 1 ℃/min, preserving heat for 2h, and finally cooling to room temperature along with the furnace to obtain the silicon oxide-based ceramic core.
The scanning electron microscope images of the silica-based ceramic core prepared in the embodiment are shown in fig. 1-3, and it can be seen that the printing slurry is prepared by adding the mullite whisker precursor, the printing layering phenomenon is weakened after sintering, in-situ grown whiskers connected between printing layers exist, and the strength of the material along the curing direction is improved. On the other hand, the in-situ grown mullite whiskers formed at high temperature are used as a framework structure, so that the overall shrinkage rate of the material is reduced, and the precision control of the mold core at high temperature is facilitated.
Example 2
(1) Preparation of silicon oxide ceramic slurry containing mullite whisker precursor
The addition amount of the ceramic powder is 56 percent of the total volume;
the ceramic powder comprises the following raw materials in percentage by weight: silica glass powder (particle size D50=7 μm): 85wt%; zirconium silicate (particle size 300 mesh): 5wt%; white corundum (particle size 300 mesh): 5wt%; aluminum fluoride (particle size 325 mesh): 3wt%; vanadium pentoxide (particle size 325 mesh): 2wt%; mixing the above materials uniformly.
The photosensitive resin premix comprises the following raw materials in percentage by weight: resin oligomer: 50wt% of urethane acrylate; resin monomer: IBOA 14wt%, HDDA 14wt%, TMPTA 14wt%; photoinitiator (2): TPO-L3 wt%; dispersing agent: BYK111 wt%, and mixing the above raw materials uniformly.
And mixing the ceramic powder with the photosensitive resin premixed solution, wherein the adding amount of the ceramic powder is 56 percent of the total volume, and preparing the silicon oxide ceramic slurry containing the mullite whisker precursor.
(2) Preparation of silica-based ceramic cores
The silica-based ceramic core was prepared in the same manner as in example 1.
The scanning electron microscope images of the silica-based ceramic core prepared in the embodiment are shown in fig. 4-5, and it can be seen that in-situ grown mullite whiskers exist, the whiskers are bridged between ceramic particles in an overlapping manner, the material performance is enhanced, and the enhancing mechanism is the same as that in embodiment 1.
Example 3
(1) Preparation of silicon oxide ceramic slurry containing mullite whisker precursor
The addition amount of the ceramic powder is 56 percent of the total volume;
the ceramic powder comprises the following raw materials in percentage by weight: silica glass powder (particle size D50=7 μm): 79wt%; zirconium silicate (particle size 300 mesh): 5wt%; white corundum (particle size 300 mesh): 5wt%; aluminum fluoride (particle size 325 mesh): 9wt%; vanadium pentoxide (particle size 325 mesh): 2wt%; mixing the above materials uniformly.
The photosensitive resin premix liquid comprises the following raw materials in percentage by weight: resin oligomer: 50wt% of urethane acrylate; resin monomer: IBOA 14wt%, HDDA 14wt%, TMPTA 14wt%; photoinitiator (2): TPO-L3 wt%; dispersing agent: BYK111 wt%, and mixing the above raw materials uniformly.
And mixing the ceramic powder with the photosensitive resin premixed solution, wherein the adding amount of the ceramic powder is 56 percent of the total volume, and preparing the silicon oxide ceramic slurry containing the mullite whisker precursor.
(2) Preparation of silica-based ceramic cores
The silica-based ceramic core was prepared in the same manner as in example 1.
The scanning electron microscope images of the silica-based ceramic core prepared in the embodiment are shown in fig. 6-7, and it can be seen that the growth condition of the mullite whisker in situ grown can be controlled by controlling the addition amount of the precursor aluminum fluoride, and different microstructures can be designed according to different requirements.
Comparative example 1
(1) Preparation of silica ceramic slurry
The addition amount of the ceramic powder was 56 vol% of the total volume;
the ceramic powder comprises the following raw materials in percentage by weight: silica glass powder (particle size D50=7 μm): 90wt%; zirconium silicate (particle size 300 mesh): 5wt%; white corundum (particle size 300 mesh): 5wt%; aluminum fluoride (particle size 325 mesh): 0wt%; vanadium pentoxide (particle size 325 mesh): 0wt%; mixing the above materials uniformly.
The photosensitive resin premix comprises the following raw materials in percentage by weight: resin oligomer: 50wt% of urethane acrylate; resin monomer: IBOA 14wt%, HDDA 14wt%, TMPTA 14wt%; photoinitiator (2): TPO-L3 wt%; dispersing agent: BYK111 wt%, and mixing the above raw materials uniformly.
And mixing the ceramic powder with the photosensitive resin premixed solution, wherein the adding amount of the ceramic powder is 56 percent of the total volume, and preparing the silicon oxide ceramic slurry containing the mullite whisker precursor.
(2) Preparation of silica-based ceramic core
The silica-based ceramic core was prepared as in example 1.
The scanning electron microscope images of the silica-based ceramic core prepared by the comparative example are shown in fig. 8-10, and it can be seen that when no precursor slurry printing material and no catalyst are added, micro cracks appear along the printing layers, and the strength is low. Such defects are widespread in ceramic products printed layer by layer, adversely affecting the practical application of the technique.
Comparative example 2
(1) Preparation of silica ceramic slurry
The addition amount of the ceramic powder was 56 vol% of the total volume;
the ceramic powder comprises the following raw materials in percentage by weight: silica glass powder (particle size D50=7 μm): 88wt%; zirconium silicate (particle size 300 mesh): 5wt%; white corundum (particle size 300 mesh): 5wt%; aluminum fluoride (particle size 325 mesh): 0wt%; vanadium pentoxide (particle size 325 mesh): 2wt%; mixing the above materials uniformly.
The photosensitive resin premix comprises the following raw materials in percentage by weight: resin oligomer: 50wt% of urethane acrylate; resin monomer: IBOA 14wt%, HDDA 14wt%, TMPTA 14wt%; photoinitiator (2): TPO-L3 wt%; dispersing agent: BYK111 wt%, and mixing the above raw materials uniformly.
And mixing the ceramic powder with the photosensitive resin premixed solution, wherein the adding amount of the ceramic powder is 56 percent of the total volume, so as to prepare the silicon oxide ceramic slurry containing the mullite whisker precursor.
(2) Preparation of silica-based ceramic core
The silica-based ceramic core was prepared in the same manner as in example 1.
The scanning electron microscope image of the silica-based ceramic core prepared by the comparative example is shown in fig. 11, and it can be seen that in-situ whiskers are difficult to grow due to the absence of gas phase conditions for whisker growth without adding precursor aluminum fluoride.
Comparative example 3
(1) Preparation of silica ceramic slurry
The addition amount of the ceramic powder was 56 vol% of the total volume;
the ceramic powder comprises the following raw materials in percentage by weight: silica glass powder (particle size D50=7 μm): 84wt%; zirconium silicate (particle size 300 mesh): 5wt%; white corundum (particle size 300 mesh): 5wt%; aluminum fluoride (particle size 325 mesh): 6wt%; vanadium pentoxide (particle size 325 mesh): 0wt%; mixing the above materials uniformly.
The photosensitive resin premix comprises the following raw materials in percentage by weight: resin oligomer: 50wt% of urethane acrylate; resin monomer: IBOA 14wt%, HDDA 14wt%, TMPTA 14wt%; photoinitiator (2): TPO-L3 wt%; dispersing agent: BYK111 wt%, and mixing the above raw materials uniformly.
And mixing the ceramic powder with the photosensitive resin premixed solution, wherein the adding amount of the ceramic powder is 56 percent of the total volume, and preparing the silicon oxide ceramic slurry containing the mullite whisker precursor.
(2) Preparation of silica-based ceramic core
The silica-based ceramic core was prepared in the same manner as in example 1.
The scanning electron microscope images of the silica-based ceramic core prepared by the comparative example are shown in fig. 12-13, and it can be seen that the crystal lattice activation degree is poor, the whisker growth condition is poor and the whisker distribution is uneven without adding the catalyst of vanadium pentoxide.
The silica-based ceramic cores prepared in examples 1-4 and comparative examples 1-3 were subjected to mechanical property and shrinkage tests, and the test results are shown in the following table:
as can be seen from the table, compared with comparative examples 1 to 3, examples 1 to 3 all effectively reduce the shrinkage performance of the DLP3D printing silica ceramic core, and particularly, the improvement effect along the printing layer direction is more remarkable. On the other hand, the room temperature flexural strength of the silica core is also improved due to the generation of interlayer whiskers. The improvement of the two performances has positive effect on the practical application of the photo-cured silicon oxide ceramic core product.
The data prove that the mullite whisker grows in situ in the sintered ceramic product finally by adding the whisker growth precursor improved photocuring silicon oxide ceramic slurry, the original layering effect of the DLP3D printing technology is effectively improved, the sintering shrinkage rate is reduced, and the room-temperature bending strength is improved. Meanwhile, the precursor aluminum fluoride and the catalyst vanadium pentoxide are indispensable in the system, and play a key role in improving the material performance.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements and the like that are made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A silicon oxide ceramic slurry containing mullite whisker precursors is characterized in that: the slurry comprises a premixed liquid of ceramic powder and photosensitive resin, wherein the addition amount of the ceramic powder is 40-65% of the total volume of the slurry;
the ceramic powder comprises the following raw materials in percentage by weight:
quartz glass powder: 80-90wt%;
mineralizing agent: 5-15wt%;
aluminum fluoride: 3-12wt%;
catalyst: 1-3wt%;
the photosensitive resin premix comprises the following raw materials in percentage by weight:
resin oligomer: 30-60wt%;
resin monomer: 30-60wt%;
photoinitiator (2): 2-4wt%;
dispersing agent: 5-10wt%.
2. The silica ceramic slurry containing a mullite whisker precursor of claim 1, wherein: the catalyst is vanadium pentoxide.
3. The silica ceramic slurry containing a mullite whisker precursor of claim 1, wherein: the mineralizer is one or more of white corundum, zirconium silicate and cubic quartz.
4. The silica ceramic slurry containing a mullite whisker precursor of claim 1, wherein: the resin oligomer is one or more of polyurethane acrylate, epoxy acrylate, polyester acrylate and hydroxyl acrylate; preferably, the resin monomer is one or more of isobornyl acrylate, 1, 6-hexanediol diacrylate, tripropylene glycol diacrylate, trimethylolpropane trimethacrylate and dipropylene glycol diacrylate.
5. The silica ceramic slurry containing a mullite whisker precursor of claim 1, wherein: the photoinitiator is one or more of 2,4, 6-trimethyl benzoyl phenyl ethyl phosphonate, phenyl bis (2, 4, 6-trimethyl benzoyl) phosphine oxide and alpha-hydroxy ethyl benzophenone; preferably, the dispersant is one or more of oleic acid, stearic acid and BYK 111.
6. The silica ceramic slurry containing a mullite whisker precursor of claim 1, wherein: the particle size of the quartz glass powder is 5-20 microns; the particle size of the mineralizer is 200-400 meshes; preferably, the fluidity of the silicon oxide ceramic slurry containing the mullite whisker precursor is less than or equal to 5000 mPas.
7. The method for preparing a silica ceramic slurry containing a mullite whisker precursor of any one of claims 1-6, wherein: the preparation method comprises the following steps:
(1) Mixing and uniformly stirring raw materials of the photosensitive resin premixed liquid to obtain photosensitive resin premixed liquid, and mixing and uniformly stirring raw materials of ceramic powder to obtain ceramic powder;
(2) Slowly adding the ceramic powder into the premixed liquid for multiple times, uniformly stirring, carrying out high-energy ball milling, and taking out;
(3) And (3) filtering and removing bubbles in vacuum of the slurry obtained by ball milling in the step (2), and finally obtaining the silicon oxide ceramic slurry containing the mullite whisker precursor.
8. A silica-based ceramic core wet blank is characterized in that: the silica-based ceramic core wet blank is prepared by using the silica ceramic slurry as a printing slurry, curing the printing slurry layer by layer through a 3D printer, and removing excessive uncured slurry on the wet blank through ultrasonic cleaning.
9. A silica-based ceramic core, characterized by: the silica-based ceramic core is prepared using the silica-based ceramic core wet blank of claim 8.
10. The method of making a silica-based ceramic core of claim 9, wherein: the preparation method comprises the following steps: putting the silica-based ceramic core wet blank into a burning pot containing alumina filler, and then putting the burning pot into a box type roasting furnace for roasting to obtain a silica-based ceramic core; preferably, the roasting process is as follows: heating to 200 ℃ at a heating rate of 0.1-2 ℃/min, heating to 400 ℃ at a heating rate of 0.1-2 ℃/min, heating to 900-1000 ℃ at a heating rate of 0.5-5 ℃/min, heating to 1120-1200 ℃ at a heating rate of 1-5 ℃/min, keeping the temperature for 4-8h, cooling to 900-1000 ℃ at a cooling rate of 0.5-1 ℃/min, and finally cooling to room temperature along with the furnace to obtain the silicon oxide-based ceramic core.
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