CN117303870A - A light-curing additive manufacturing zero-sinter shrinkage aluminum-based ceramic core material - Google Patents
A light-curing additive manufacturing zero-sinter shrinkage aluminum-based ceramic core material Download PDFInfo
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Abstract
The invention discloses a zero sintering shrinkage aluminum-based ceramic core material manufactured by photocuring additive, wherein slurry of the zero sintering shrinkage aluminum-based ceramic core material consists of photosensitive resin, a dispersing agent and ceramic powder, wherein the photosensitive resin accounts for 35-45vol%, the ceramic powder accounts for 55-60vol% and the dispersing agent accounts for 1-5% of the mass of the ceramic powder, the photosensitive resin contains 0.4-1% of photoinitiator, and the ceramic powder comprises the following components: the invention relates to the technical field of ceramic material additive manufacturing, in particular to alumina, kyanite and silicon oxide. According to the zero sintering shrinkage aluminum-based ceramic core material manufactured by photocuring additive, kyanite is added into the photocuring ceramic slurry, the shrinkage of the ceramic core in the sintering stage is compensated by the expansion generated by decomposing kyanite at high temperature, and the zero sintering shrinkage of the ceramic core at 1600 ℃ is realized under the combined action of the decomposition expansion of kyanite and the sintering shrinkage of alumina.
Description
Technical Field
The invention relates to the technical field of ceramic material additive manufacturing, in particular to a zero-sintering shrinkage aluminum-based ceramic core material manufactured by photocuring additive manufacturing.
Background
The core manufactured by the ceramic material has good high-temperature mechanical property and chemical stability, and can be used for manufacturing high-precision hollow turbine blades. Currently, with the progress of technology, it has become increasingly difficult for conventional hot injection molding to meet the processing requirements of highly complex ceramic cores. Advances in additive manufacturing technology have made it possible to obtain ceramic cores with higher complexity and shorter production cycles by additive means. The additive manufacturing process based on photo-curing has the advantage of high forming precision, and can be used for manufacturing ceramic cores with high precision and complex shapes. However, in the additive manufacturing process based on the stereolithography technology, the obtained ceramic core has higher sintering shrinkage rate due to more binder content in the material for printing, which has adverse effect on the dimensional accuracy control of the core and limits the further popularization of the ceramic core in industrial application.
The first prior art is a photocuring 3D printing alumina-based ceramic core with a patent publication number of CN114853450A and a preparation method thereof, wherein the photocuring 3D printing alumina-based ceramic core and the preparation method thereof are disclosed, three alumina ceramic powders of coarse, medium and fine are adopted for grading to obtain photocuring alumina-based ceramic core slurry with high solid content and powder grading, and then the photocuring 3D printing, degreasing and sintering are carried out to obtain the ceramic core with excellent mechanical properties.
A disadvantage of the first prior art is that the technology, although improving the mechanical properties of the high porosity ceramic cores, does not optimize the sintering shrinkage properties of the ceramic slurry.
In the second prior art, patent publication number CN114082896a is a photo-curing 3D printing aluminum-based ceramic core and a preparation method thereof, wherein a photo-curing 3D printing aluminum-based ceramic core and a preparation method thereof are provided, the photo-curing 3D printing aluminum-based ceramic core and the preparation method thereof are provided, a mixed fiber material is obtained by mixing and drying an organic fiber through-hole agent and a starch pore-forming agent, then the mixed fiber material, mixed powder containing framework powder and filler and photo-curing resin prepolymer solution are mixed to obtain aluminum-based ceramic core slurry, and the aluminum-based ceramic core with higher pore-opening rate and better removal performance is obtained after photo-curing 3D printing, degreasing and sintering.
The second disadvantage of the prior art is that the technology considers the sintering precision problem of the ceramic core existing at present, and improves the material for the problem, the sintering cracking tendency of the aluminum-based ceramic core is reduced by adding the through hole agent, but the sintering shrinkage performance of the ceramic slurry is not improved.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a zero sintering shrinkage aluminum-based ceramic core material manufactured by photo-curing additive, which can be used for preparing a complex ceramic core with zero sintering shrinkage rate and excellent comprehensive performance.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme: the slurry of the zero-sintering shrinkage aluminum-based ceramic core material manufactured by photo-curing additive comprises photosensitive resin, dispersing agent and ceramic powder, wherein the photosensitive resin accounts for 35-45vol%, the ceramic powder accounts for 55-60vol% and the dispersing agent accounts for 1-5% of the mass of the ceramic powder, and the photosensitive resin contains 0.4-1% of photoinitiator.
The ceramic powder comprises the following components in percentage by mass: 70wt% alumina, 8wt% kyanite and 22wt% silica.
The photosensitive resin is composed of HDDA resin, PPTTA resin, PEG400DA resin and HEMA resin, and the content ratio of the HDDA resin, the PPTTA resin, the PEG400DA resin and the HEMA resin is as follows: HDDA: PPTTA: PEG400DA: hema=1: 2:3:1.
preferably, the HDDA resin and PPTTA resin are difunctional and tetrafunctional UV monomers, respectively, that are important components in constructing cure strength.
Preferably, the PEG400DA resin is used as a difunctional long-chain UV monomer to increase the flexibility of the printing green body and reduce the cracking in the degreasing process.
Preferably, the HEMA resin is a low viscosity reactive diluent that is used to reduce the viscosity of the slurry.
Preferably, the granularity of the alumina is 10-30um, the granularity of the kyanite is 10-30um, and the granularity of the silica is 30-50um.
Preferably, the photoinitiator is TPO.
The invention also provides a forming process for manufacturing the zero-sintering shrinkage aluminum-based ceramic core material by using the photo-curing additive, which specifically comprises the following steps of:
s1, adding photosensitive resin, a photoinitiator and a dispersing agent into a container, and uniformly mixing to obtain a UV adhesive; the mechanical stirring time is not less than 10min, the room temperature is not higher than 35 ℃, and the ambient humidity is not higher than 40%;
s2, adding the ceramic powder and the UV adhesive into a container according to a proportion, and mechanically stirring uniformly to obtain ceramic slurry;
s3, transferring the ceramic slurry obtained in the step S2 into a nylon ball milling tank, adding corundum balls, and performing ball milling by using a planetary ball mill;
s4, performing vacuum defoaming on the ceramic slurry subjected to ball milling in the step S3 to obtain ceramic slurry for printing, wherein the vacuum defoaming time is 3-5min;
s5, working the ceramic slurry prepared in the step S4 through a photocuring ceramic 3D printer to obtain a ceramic part green body, wherein the printer comprises an inverted DLP ceramic printer (Autocera-L, autocera-M, autocera-R of Beijing Tech Co., ltd.) or a front DLP ceramic printer (Autocera-U, autocera-XL of Beijing Tech Co., ltd.), the printing layering thickness is 25-100um, and the exposure power is 5-20mW/cm 2 The exposure time of the single layer is 5-12s;
s6, cleaning the surface of the ceramic part green body printed in the step S5 by isopropanol and airing;
and S7, placing the ceramic green compact in the step S6 into a ceramic sagger, and then placing the ceramic green compact into a muffle furnace for sintering, and obtaining the ceramic core with zero sintering shrinkage after the sintering is completed.
Preferably, in the step S7, the heating rate is not more than 10 ℃/min below 1000 ℃, the heating rate is not more than 5 ℃/min above 1000 ℃, the final firing temperature is 1600 ℃, and the heat preservation time is not more than 4 hours.
Preferably, in the step S3, the ball-to-material ratio is 3:2, the ball milling rotating speed is 400r/min, and the ball milling time is 4-12h.
Preferably, in the step S2, the mechanical stirring time is not less than 10min, the rotating speed of the rotor is 300-600r/min, the room temperature is not higher than 35 ℃, and the ambient humidity is not higher than 40%.
(III) beneficial effects
The invention provides a zero-sintering shrinkage aluminum-based ceramic core material manufactured by photocuring additive. Compared with the prior art, the method has the following beneficial effects: the zero-sintering shrinkage aluminum-based ceramic core material manufactured by photo-curing additive comprises slurry, wherein the slurry is composed of photosensitive resin, dispersing agent and ceramic powder, the photosensitive resin accounts for 35-45vol%, the ceramic powder accounts for 55-60vol% and the dispersing agent accounts for 1-5% of the mass of the ceramic powder, the photosensitive resin contains 0.4-1% of photoinitiator, and the ceramic powder comprises the following components in percentage by mass: 70wt% of aluminum oxide, 8wt% of kyanite and 22wt% of silicon oxide, wherein the photosensitive resin consists of HDDA resin, PPTTA resin, PEG400DA resin and HEMA resin, and the content ratio of the HDDA resin, the PPTTA resin, the PEG400DA resin and the HEMA resin is as follows: HDDA: PPTTA: PEG400DA: hema=1: 2:3: according to the invention, the complex ceramic core with zero sintering shrinkage rate and excellent comprehensive performance can be prepared by adding kyanite into the photo-curing ceramic slurry, wherein the expansion generated by decomposing kyanite at high temperature compensates the shrinkage of the ceramic core in the sintering stage, and zero sintering shrinkage of the ceramic core at 1600 ℃ is realized under the combined action of the decomposing expansion of kyanite and the sintering shrinkage of alumina.
Drawings
FIG. 1 is a flow chart of the forming process of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the embodiment of the invention provides three technical schemes: a zero sintering shrinkage aluminum-based ceramic core material manufactured by photo-curing additive comprises the following embodiments:
example 1
The slurry of the zero-sintering shrinkage aluminum-based ceramic core material manufactured by photo-curing additive comprises photosensitive resin, a dispersing agent and ceramic powder, wherein the photosensitive resin accounts for 40vol%, the ceramic powder accounts for 58vol% and the dispersing agent accounts for 1.3% of the mass of the ceramic powder, and the photosensitive resin contains 0.7% of photoinitiator which is TPO;
the ceramic powder comprises the following components in percentage by mass: 70wt% of aluminum oxide, 8wt% of kyanite and 22wt% of silicon oxide, wherein the granularity of the aluminum oxide is 20um, the granularity of the kyanite is 20um, and the granularity of the silicon oxide is 40um;
the photosensitive resin is composed of HDDA resin, PPTTA resin, PEG400DA resin and HEMA resin, and the content ratio of the HDDA resin, the PPTTA resin, the PEG400DA resin and the HEMA resin is as follows: HDDA: PPTTA: PEG400DA: hema=1: 2:3:1, hdda resin and PPTTA resin are difunctional and tetrafunctional UV monomers, respectively, which are important components for building cure strength, and PEG400DA resin as difunctional long chain UV monomer increases flexibility of the printed green body, reduces cracking during degreasing, and HEMA resin is a low viscosity reactive diluent for reducing viscosity of the paste.
The embodiment of the invention also provides a forming process for manufacturing the zero-sintering shrinkage aluminum-based ceramic core material by using the photo-curing additive, which specifically comprises the following steps:
s1, adding photosensitive resin, a photoinitiator and a dispersing agent into a container, and uniformly mixing to obtain a UV adhesive; mechanical stirring time is 10min, room temperature is 35 ℃, and ambient humidity is 40%;
s2, adding ceramic powder and a UV adhesive into a container according to a proportion, mechanically stirring uniformly to obtain ceramic slurry, wherein the mechanical stirring time is 10min, the rotating speed of a rotor is 450r/min, the room temperature is 35 ℃, and the ambient humidity is 40%;
s3, transferring the ceramic slurry obtained in the step S2 into a nylon ball milling tank, adding corundum grinding balls, and performing ball milling by using a planetary ball mill, wherein the ball-to-material ratio is 3:2, ball milling rotating speed is 400r/min, and ball milling time is 8h;
s4, performing vacuum defoaming on the ceramic slurry subjected to ball milling in the step S3 to obtain ceramic slurry for printing, wherein the vacuum defoaming time is 4min;
s5, working the ceramic slurry prepared in the step S4 through a photocuring ceramic 3D printer to obtain a ceramic part green body, wherein the printer comprises an inverted DLP ceramic printer (Autocera-L, autocera-M, autocera-R of Beijing Tech Co., ltd.) or a front DLP ceramic printer (Autocera-U, autocera-XL of Beijing Tech Co., ltd.), the printing layering thickness is 60um, and the exposure power is 12mW/cm 2 The exposure time of the single layer is 8s;
s6, cleaning the surface of the ceramic part green body printed in the step S5 by isopropanol and airing;
and S7, placing the ceramic green compact in the step S6 into a ceramic sagger, placing the ceramic green compact into a muffle furnace for sintering, obtaining the ceramic core with zero sintering shrinkage after the sintering is completed, heating at a heating rate of 10 ℃/min below 1000 ℃, heating at a heating rate of 5 ℃/min above 1000 ℃, and keeping the final sintering temperature at 1600 ℃ for 4 hours.
Example 2
The slurry of the zero-sintering shrinkage aluminum-based ceramic core material manufactured by photo-curing additive comprises photosensitive resin, a dispersing agent and ceramic powder, wherein the photosensitive resin accounts for 40vol%, the ceramic powder accounts for 55vol% and the dispersing agent accounts for 4.6% of the mass of the ceramic powder, the photosensitive resin contains 0.4% of photoinitiator which is TPO;
the ceramic powder comprises the following components in percentage by mass: 70wt% of aluminum oxide, 8wt% of kyanite and 22wt% of silicon oxide, wherein the granularity of the aluminum oxide is 10um, the granularity of the kyanite is 10um, and the granularity of the silicon oxide is 30um;
the photosensitive resin is composed of HDDA resin, PPTTA resin, PEG400DA resin and HEMA resin, and the content ratio of the HDDA resin, the PPTTA resin, the PEG400DA resin and the HEMA resin is as follows: HDDA: PPTTA: PEG400DA: hema=1: 2:3:1, hdda resin and PPTTA resin are difunctional and tetrafunctional UV monomers, respectively, which are important components for building cure strength, and PEG400DA resin as difunctional long chain UV monomer increases flexibility of the printed green body, reduces cracking during degreasing, and HEMA resin is a low viscosity reactive diluent for reducing viscosity of the paste.
The embodiment of the invention also provides a forming process for manufacturing the zero-sintering shrinkage aluminum-based ceramic core material by using the photo-curing additive, which specifically comprises the following steps:
s1, adding photosensitive resin, a photoinitiator and a dispersing agent into a container, and uniformly mixing to obtain a UV adhesive; mechanical stirring time is 11min, room temperature is 34 ℃, and ambient humidity is 39%;
s2, adding ceramic powder and a UV adhesive into a container according to a proportion, mechanically stirring uniformly to obtain ceramic slurry, wherein the mechanical stirring time is 11min, the rotating speed of a rotor is 300r/min, the room temperature is 34 ℃, and the ambient humidity is 39%;
s3, transferring the ceramic slurry obtained in the step S2 into a nylon ball milling tank, adding corundum grinding balls, and performing ball milling by using a planetary ball mill, wherein the ball-to-material ratio is 3:2, ball milling rotating speed is 400r/min, and ball milling time is 4h;
s4, performing vacuum defoaming on the ceramic slurry subjected to ball milling in the step S3 to obtain ceramic slurry for printing, wherein the vacuum defoaming time is 3min;
s5, working the ceramic slurry prepared in the step S4 through a photocuring ceramic 3D printer to obtain a ceramic part green body, wherein the printer comprises an inverted DLP ceramic printer (Autocera-L, autocera-M, autocera-R of Beijing Tech Co., ltd.) or a front DLP ceramic printer (Autocera-U, autocera-XL of Beijing Tech Co., ltd.) with a printing layering thickness of 25um and an exposure power of 5mW/cm 2 The exposure time of the single layer is 5s;
s6, cleaning the surface of the ceramic part green body printed in the step S5 by isopropanol and airing;
and S7, placing the ceramic green compact in the step S6 into a ceramic sagger, placing the ceramic green compact into a muffle furnace for sintering, obtaining the ceramic core with zero sintering shrinkage after the sintering is completed, heating at a heating rate of 9 ℃/min below 1000 ℃, heating at a heating rate of 4 ℃/min above 1000 ℃, and keeping the final sintering temperature at 1600 ℃ for 3 hours.
Example 3
The slurry of the zero-sintering shrinkage aluminum-based ceramic core material manufactured by photo-curing additive comprises photosensitive resin, a dispersing agent and ceramic powder, wherein the photosensitive resin accounts for 36vol%, the ceramic powder accounts for 60vol% and the dispersing agent accounts for 3% of the mass of the ceramic powder, the photosensitive resin contains 1% of photoinitiator, and the photoinitiator is TPO;
the ceramic powder comprises the following components in percentage by mass: 70wt% of aluminum oxide, 8wt% of kyanite and 22wt% of silicon oxide, wherein the granularity of the aluminum oxide is 30um, the granularity of the kyanite is 30um, and the granularity of the silicon oxide is 50um;
the photosensitive resin is composed of HDDA resin, PPTTA resin, PEG400DA resin and HEMA resin, and the content ratio of the HDDA resin, the PPTTA resin, the PEG400DA resin and the HEMA resin is as follows: HDDA: PPTTA: PEG400DA: hema=1: 2:3:1, hdda resin and PPTTA resin are difunctional and tetrafunctional UV monomers, respectively, which are important components for building cure strength, and PEG400DA resin as difunctional long chain UV monomer increases flexibility of the printed green body, reduces cracking during degreasing, and HEMA resin is a low viscosity reactive diluent for reducing viscosity of the paste.
The embodiment of the invention also provides a forming process for manufacturing the zero-sintering shrinkage aluminum-based ceramic core material by using the photo-curing additive, which specifically comprises the following steps:
s1, adding photosensitive resin, a photoinitiator and a dispersing agent into a container, and uniformly mixing to obtain a UV adhesive; mechanical stirring time is 12min, room temperature is 33 ℃, and ambient humidity is 38%;
s2, adding ceramic powder and a UV adhesive into a container according to a proportion, mechanically stirring uniformly to obtain ceramic slurry, wherein the mechanical stirring time is 12min, the rotating speed of a rotor is 600r/min, the room temperature is 33 ℃, and the ambient humidity is 38%;
s3, transferring the ceramic slurry obtained in the step S2 into a nylon ball milling tank, adding corundum grinding balls, and performing ball milling by using a planetary ball mill, wherein the ball-to-material ratio is 3:2, ball milling rotating speed is 400r/min, and ball milling time is 12h;
s4, performing vacuum defoaming on the ceramic slurry subjected to ball milling in the step S3 to obtain ceramic slurry for printing, wherein the vacuum defoaming time is 5min;
s5, working the ceramic slurry prepared in the step S4 through a photocuring ceramic 3D printer to obtain a ceramic part green body, wherein the printer comprises an inverted DLP ceramic printer (Autocera-L, autocera-M, autocera-R of Beijing Tech Co., ltd.) or a front DLP ceramic printer (Autocera-U, autocera-XL of Beijing Tech Co., ltd.) with a printing layering thickness of 100um and an exposure power of 20mW/cm 2 The exposure time of the single layer is 12s;
s6, cleaning the surface of the ceramic part green body printed in the step S5 by isopropanol and airing;
and S7, placing the ceramic green body in the step S6 into a ceramic sagger, placing the ceramic green body into a muffle furnace for sintering, and obtaining the ceramic core with zero sintering shrinkage after the sintering is completed, wherein the heating rate is 8 ℃/min below 1000 ℃, the heating rate is 3 ℃/min above 1000 ℃, the final sintering temperature is 1600 ℃, and the heat preservation time is 2h.
When ceramic powder is prepared, the D50 of the powder is shown in table 1.
TABLE 1 particle size diameter of ceramic raw materials
When the sample is sintered, in order to prevent crack defects from being generated after degreasing and sintering, the heating rate is set to be not more than 10 ℃/min under 1000 ℃, the heating rate is set to be not more than 5 ℃/min under 1000 ℃, the heating rate is set to be not more than 200 ℃/min under 500 ℃, the heating rate is slowed down in the range of 200 ℃ to 500 ℃, and a plurality of heat preservation steps are added to ensure that organic matters are completely removed in stages. The final firing temperature is set by experimental requirements and material properties, and the heat preservation time is not more than 4 hours.
After many experiments, it was found that the shrinkage of the sample obtained by sintering the formulation with an alumina content of 70%, a kyanite content of 8% and a silica content of 22% was 0 at a sintering temperature of 1600 ℃.
Table 2 shrinkage after sintering of alumina-kyanite-silica samples at 1600 c
In summary, the invention adds kyanite into the photo-curing ceramic slurry, the expansion generated by decomposing kyanite at high temperature compensates the shrinkage of the ceramic core at the sintering stage, and realizes the zero sintering shrinkage of the ceramic core at 1600 ℃ under the combined action of the decomposing expansion of kyanite and the sintering shrinkage of alumina.
And all that is not described in detail in this specification is well known to those skilled in the art.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A zero sintering shrinkage aluminum-based ceramic core material manufactured by photo-curing additive is characterized in that: the slurry consists of photosensitive resin, dispersing agent and ceramic powder, wherein the photosensitive resin accounts for 35-45vol%, the ceramic powder accounts for 55-60vol% and the dispersing agent accounts for 1-5% of the mass of the ceramic powder, and the photosensitive resin contains 0.4-1% of photoinitiator;
the ceramic powder comprises the following components in percentage by mass: 70wt% alumina, 8wt% kyanite and 22wt% silica;
the photosensitive resin is composed of HDDA resin, PPTTA resin, PEG400DA resin and HEMA resin, and the content ratio of the HDDA resin, the PPTTA resin, the PEG400DA resin and the HEMA resin is as follows: HDDA: PPTTA: PEG400DA: hema=1: 2:3:1.
2. the photo-cured additive manufacturing zero sintering shrinkage aluminum-based ceramic core material according to claim 1, wherein: the HDDA resin and PPTTA resin are difunctional and tetrafunctional UV monomers, respectively, which are important components for building cure strength.
3. The photo-cured additive manufacturing zero sintering shrinkage aluminum-based ceramic core material according to claim 1, wherein: the PEG400DA resin is used as a difunctional long-chain UV monomer to increase the flexibility of a printing green body and reduce the cracking in the degreasing process.
4. The photo-cured additive manufacturing zero sintering shrinkage aluminum-based ceramic core material according to claim 1, wherein: the HEMA resin is a low viscosity reactive diluent that is used to reduce the viscosity of the slurry.
5. The photo-cured additive manufacturing zero sintering shrinkage aluminum-based ceramic core material according to claim 1, wherein: the granularity of the alumina is 10-30um, the granularity of the kyanite is 10-30um, and the granularity of the silicon oxide is 30-50um.
6. The photo-cured additive manufacturing zero sintering shrinkage aluminum-based ceramic core material according to claim 1, wherein: the photoinitiator is TPO.
7. A process for forming a zero sintering shrinkage aluminum-based ceramic core material from a photo-cured additive material according to any one of claims 1-6, wherein: the method specifically comprises the following steps of:
s1, adding photosensitive resin, a photoinitiator and a dispersing agent into a container, and uniformly mixing to obtain a UV adhesive; the mechanical stirring time is not less than 10min, the room temperature is not higher than 35 ℃, and the ambient humidity is not higher than 40%;
s2, adding the ceramic powder and the UV adhesive into a container according to a proportion, and mechanically stirring uniformly to obtain ceramic slurry;
s3, transferring the ceramic slurry obtained in the step S2 into a nylon ball milling tank, adding corundum balls, and performing ball milling by using a planetary ball mill;
s4, performing vacuum defoaming on the ceramic slurry subjected to ball milling in the step S3 to obtain ceramic slurry for printing, wherein the vacuum defoaming time is 3-5min;
s5, working the ceramic slurry prepared in the step S4 through a photocuring ceramic 3D printer to obtain a ceramic part green body, wherein the printer comprises an inverted DLP ceramic printer or a right-side DLP ceramic printer, the printing layering thickness is 25-100um, and the exposure power is 5-20mW/cm 2 The exposure time of the single layer is 5-12s;
s6, cleaning the surface of the ceramic part green body printed in the step S5 by isopropanol and airing;
and S7, placing the ceramic green compact in the step S6 into a ceramic sagger, and then placing the ceramic green compact into a muffle furnace for sintering, and obtaining the ceramic core with zero sintering shrinkage after the sintering is completed.
8. The process for forming a zero sintering shrinkage aluminum-based ceramic core material by photo-curing additive manufacturing according to claim 7, wherein the process comprises the following steps: in the step S7, the heating rate is not more than 10 ℃/min below 1000 ℃, the heating rate is not more than 5 ℃/min above 1000 ℃, the final firing temperature is 1600 ℃, and the heat preservation time is not more than 4 hours.
9. The process for forming a zero sintering shrinkage aluminum-based ceramic core material by photo-curing additive manufacturing according to claim 7, wherein the process comprises the following steps: in the step S3, the ball-to-material ratio is 3:2, the ball milling rotating speed is 400r/min, and the ball milling time is 4-12h.
10. The process for forming a zero sintering shrinkage aluminum-based ceramic core material by photo-curing additive manufacturing according to claim 7, wherein the process comprises the following steps: in the step S2, the mechanical stirring time is not less than 10min, the rotating speed of the rotor is 300-600r/min, the room temperature is not higher than 35 ℃, and the ambient humidity is not higher than 40%.
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