CN110590387A - Inorganic fiber composite silicon-based ceramic core and preparation method thereof - Google Patents
Inorganic fiber composite silicon-based ceramic core and preparation method thereof Download PDFInfo
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- CN110590387A CN110590387A CN201911006926.0A CN201911006926A CN110590387A CN 110590387 A CN110590387 A CN 110590387A CN 201911006926 A CN201911006926 A CN 201911006926A CN 110590387 A CN110590387 A CN 110590387A
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- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
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Abstract
The invention belongs to the technical field of ceramic preparation, and relates to an inorganic fiber composite silicon-based ceramic core based on a 3D printing technology, wherein core slurry of the inorganic fiber composite silicon-based ceramic core comprises quartz glass powder, a mineralizer, ceramic fibers and light-cured resin.
Description
Technical Field
The invention relates to the technical field of ceramic preparation, in particular to an inorganic fiber composite silicon-based ceramic core and a preparation method thereof.
Background
With the increasing of the temperature of the gas before the turbine of the aviation gas turbine engine, the improvement of the heat dissipation capacity of the turbine blade through the complex air-cooling inner cavity structure becomes the key of the advanced engine manufacturing, and therefore higher requirements are put forward on the ceramic core for forming the inner cavity structure of the blade. Ceramic cores are key components in the manufacture of high performance turbine blades, and their performance and quality directly affect the performance of the turbine blades.
The traditional method for forming the ceramic core mainly comprises hot-pressing injection molding, wherein a base material and a mineralizer are uniformly mixed, a plasticizer is added at the same time, then ceramic biscuit is obtained after hot-pressing injection molding, and the biscuit is sintered to obtain the ceramic core. The hot-pressing injection molding is beneficial to casting ceramic cores with complex structures and fine sizes, but the slurry needs to be heated and provided with pressure during pouring, the wax removal time is long, and the process is complex.
The silica-based ceramic core using quartz glass as a main raw material is most widely applied to the manufacture of high-temperature alloy columnar crystals and single crystal blades due to the excellent decoring performance. However, because the silicon-based core has a low fire resistance temperature, the silicon-based core is generally applied below 1560 ℃, and meanwhile, the silicon-based core has low high-temperature strength and poor high-temperature creep resistance, and the application of the silicon-based core is limited to a certain extent. Therefore, if the high-temperature strength and the high-temperature creep resistance can be improved, the alloy is expected to be applied to the precision casting and forming of large-scale high-temperature alloy hollow blades such as gas turbine orientation and single crystal blades. Patent 201410224963.X discloses a fiber-reinforced ceramic core material and a hot-press injection molding process, which show that the addition of silicon carbide fiber can avoid the cracking of the core in the roasting process, however, the early preparation process of the core material is relatively complex, and the cost of the silicon carbide fiber is high, so that the practical application of the core material is limited.
The 3D printing method is different from the traditional material reducing (such as cutting) and material waiting (such as forging) manufacturing methods, a mold is not needed in the manufacturing process, a complex structure which cannot be achieved or is difficult to achieve by the traditional method can be realized, the processing procedures are greatly reduced, the processing period is shortened, and the technical characteristics well accord with the manufacturing requirements of the ceramic core. At present, the 3DP process in the 3D printing technology is successfully used for manufacturing sand cores in the field of sand casting, and is widely applied to forming of complex aluminum alloy castings. However, the ceramic product printed by the 3DP process has high surface roughness, and generally cannot meet the requirement of precision casting of the oriented blade with high surface precision. Patent 201710284229.6 discloses a method for making a short fiber mixed calcium oxide based ceramic powder and uses a 3DP process to achieve integral formation of a ceramic core and shell, however, the patent does not disclose surface roughness data of the ceramic core.
Disclosure of Invention
The invention aims to solve the defects of the technology and provide an inorganic fiber composite silicon-based ceramic core based on a 3D printing technology and a preparation method thereof, and the inorganic fiber composite silicon-based ceramic core can be used for preparing a silicon-based ceramic core with a complex structure and excellent high-temperature creep resistance and decoring performance.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides an inorganic fiber composite silicon-based ceramic core, which is prepared by carrying out photocuring 3D printing on core slurry, sintering and reinforcing by ethyl silicate hydrolysate to obtain the silicon-based ceramic core, wherein the core slurry is composed of quartz glass powder, a mineralizer, ceramic fibers and photocuring resin.
Preferably, SiO in the silica glass frit2The content is more than 99wt%, and the particle size distribution is 1-30 μm.
Preferably, the mineralizer is zirconium silicate micro powder, wherein Fe2O3The impurity content is less than 0.1wt%, and the particle size distribution is 1-30 μm.
Preferably, the ceramic fibers are preferably alumina fibers having an alpha-alumina content > 99wt%, a diameter of 5-10 μm and a length of 50-300 μm.
Preferably, the light-cured resin is water-based polyurethane acrylate or water-based epoxy acrylate or polyester acrylate containing a photoinitiator, the viscosity is less than or equal to 270CPS (30 ℃), and the light-cured resin can be cured under the irradiation of ultraviolet light to combine the ceramic powder and the fiber material together.
The source of the photocurable resin in the present invention is not particularly limited, and commercially available products familiar to those skilled in the art may be used.
The preferable components and mass percentage content of the ethyl silicate hydrolysate are as follows: 34.3 percent of ethyl silicate, 25 percent of absolute ethyl alcohol, 1.5 percent of isopropanol, 13 percent of propylene glycol methyl ether, 25.8 percent of acidic silica sol and 0.4 percent of hydrochloric acid (20 percent of mass concentration) which are mixed by a stirrer. In the present invention, the sources of the components of the silicate hydrolysis solution are not particularly limited, and commercially available products known to those skilled in the art may be used.
The invention provides a preparation method of an inorganic fiber composite silicon-based ceramic core, which comprises the following steps:
1) preparing core slurry: adding 85-95wt% of quartz glass powder, 3-10wt% of zirconium silicate powder and 2-5wt% of alumina fiber into a V-shaped mixer, and forcibly stirring and dry-mixing for 2-5h to obtain a ceramic core material; adding light-cured resin accounting for 30-50wt% of the ceramic core material into a planetary ball mill, adding the ceramic core material according to the proportion, and performing ball milling and blending for 30-60min to obtain ceramic core slurry;
2) 3D printing of core biscuit: establishing a 3D model of the ceramic core by a computer, decomposing the 3D model into a series of two-dimensional models with the thickness of 100-;
3) secondary curing of the core biscuit: putting the ceramic core biscuit obtained in the step 2) into an ultraviolet curing box to be cured for 1-5 hours continuously;
4) and (3) core sintering: placing the ceramic core biscuit obtained in the step 3) into light magnesium oxide powder of a ceramic sagger, and sintering in a core sintering furnace, wherein the optimized sintering temperature is as follows: heating to 200 ℃ and preserving heat for 2h, heating to 500 ℃ and preserving heat for 2h, heating to 1000 ℃ and preserving heat for 2h, then heating to 1200 ℃ and preserving heat for 2h, wherein the heating speed is 30 ℃/h, cooling to room temperature along with the furnace, and then discharging;
5) and (3) core trimming: carrying out surface powder blowing cleaning on the sintered ceramic core, and then detecting and modifying the shape by using a core measuring tool;
6) core strengthening: and putting the core into a container filled with ethyl silicate hydrolysate, then putting the container in a negative pressure environment to enable the ethyl silicate hydrolysate to permeate into pores of the core, keeping the soaking time for 2 hours, then putting the core on a frame to be dried for 24 hours, and finally drying the core for 2 hours at 150 ℃ to obtain the inorganic fiber composite silicon-based ceramic core.
The invention has the following beneficial effects:
according to the inorganic fiber composite silicon-based ceramic core and the preparation method thereof, the 3D printing technology and the ceramic fiber reinforced core material are successfully combined on the basis of the prior art, the advantages of the two are fully exerted, the good high-temperature mechanical property foundation is achieved, and the ceramic core biscuit with any shape, complexity and a precise structure can be easily prepared. According to the ceramic core prepared by the 3D printing technology, the ceramic core biscuit can be directly formed without designing and manufacturing a mold and undergoing the processes of mold closing, demolding and the like, so that the research and development and manufacturing periods are shortened, the product design freedom is high, errors occur, and the three-dimensional model size and the 3D printing technological parameters can be directly modified in a computer. Compared with the 3DP printing technology, the ceramic core prepared by the photocuring 3D printing process has low surface roughness and high dimensional precision, so the ceramic core has wide application prospect in the preparation of new generation turbine blades of aero-engines, and can be applied to directional solidification precision casting of the turbine blades of high-performance gas turbines.
Detailed Description
The invention is further described below by way of examples.
Example 1:
the embodiment describes an inorganic fiber composite silicon-based ceramic core based on a 3D printing technology, which is composed of quartz glass powder, a mineralizer, ceramic fibers and a light-cured resin. SiO in quartz glass powder2The content is more than 99wt%, and the particle size distribution is 1-30 μm. The mineralizer is zirconium silicate micropowder, wherein Fe2O3The impurity content is less than 0.1wt%, and the particle size distribution is 1-30 μm. The ceramic fibers are preferably alumina fibers with an alpha-alumina content of > 99wt%, a diameter of 5-10 μm and a length of 50-300 μm. The light-cured resin is water-based polyurethane acrylate containing a photoinitiator, the viscosity is less than or equal to 270CPS (30 ℃), and the light-cured resin can be cured under the irradiation of ultraviolet light to combine the ceramic powder and the fiber material together.
The preparation method of the ceramic core comprises the following steps:
1) preparing core slurry: adding 85wt% of quartz glass powder, 10wt% of zirconium silicate powder and 5wt% of alumina fiber into a V-shaped mixer, and forcibly stirring and dry-mixing for 5 hours to obtain a ceramic core material; adding water-based polyurethane acrylate accounting for 50wt% of the ceramic core material into a planetary ball mill, adding the ceramic core material according to the proportion, and carrying out ball milling and blending for 30min to obtain ceramic core slurry.
2) 3D printing of core biscuit: A3D model of the ceramic core is established through a computer, and then the 3D model is decomposed layer by layer through the computer to be decomposed into a series of two-dimensional models with the thickness of 100 mu m. Inputting the established 3D model data into an ultraviolet light curing 3D printer, setting a printing program, injecting the ceramic core slurry obtained in the step 1) into the 3D printer, and curing, stacking and molding the two-dimensional sheets layer by layer in an ultraviolet light layer-by-layer scanning curing mode to obtain a ceramic core biscuit. Soaking the biscuit in anhydrous ethanol for removing excessive uncured resin, wherein the soaking time is 5min each time, and the cleaning times are 4 times.
3) Secondary curing of the core biscuit: putting the ceramic core biscuit obtained in the step 2) into an ultraviolet curing box to be cured for 5 hours continuously.
4) And (3) core sintering: placing the ceramic core biscuit obtained in the step 3) into light magnesium oxide powder of a ceramic sagger, and sintering in a core sintering furnace; the sintering temperature of the core is as follows: heating to 200 ℃ and preserving heat for 2h, heating to 500 ℃ and preserving heat for 2h, heating to 1000 ℃ and preserving heat for 2h, then heating to 1200 ℃ and preserving heat for 2h, wherein the heating speed is 30 ℃/h, cooling to room temperature along with the furnace, and then discharging;
5) and (3) core trimming: and (4) blowing powder on the surface of the sintered ceramic core for cleaning, and then detecting and post-modifying the shape by using a core measuring tool.
6) Core strengthening: putting the core into a container filled with ethyl silicate hydrolysate, wherein the ethyl silicate hydrolysate comprises the following components in percentage by mass: 31.3% of ethyl silicate, 25% of absolute ethyl alcohol, 1.5% of isopropanol, 13% of propylene glycol methyl ether, 25.8% of acidic silica sol and 0.4% of hydrochloric acid (20% of mass concentration), and the components are mixed by a stirrer; and then placing the container in a negative pressure environment, so that the ethyl silicate hydrolysate can permeate into the pores of the core, keeping the soaking time for 2 hours, then placing the container on a rack, airing for 24 hours, and finally drying for 2 hours at 150 ℃ to obtain a final product.
Through detection, the porosity of the ceramic core prepared by the process after sintering is 29.82%, the surface roughness is Ra2.92, the room-temperature bending strength is 52.77MPa, the bending strength at 1500 ℃ is 30.26MPa, and the high-temperature deflection at 1500 ℃ is 0.25 mm; through a decoring test of 8 hours in a decoring kettle with the concentration of the decoring liquid (KOH aqueous solution) of 60wt%, the pressure of 2.8MPa and the temperature of 360 ℃, the dissolution rate of the ceramic core reaches 100 percent. The detection results show that the ceramic core is suitable for directional solidification forming of the high-temperature alloy hollow blade.
Example 2:
the embodiment describes an inorganic fiber composite silicon-based ceramic core based on a 3D printing technology, which is composed of quartz glass powder, a mineralizer, ceramic fibers and a light-cured resin. SiO in quartz glass powder2The content is more than 99wt%, and the particle size distribution is 1-30 μm. The mineralizer is zirconium silicate micropowder, wherein Fe2O3The impurity content is less than 0.1wt%, and the particle size distribution is 1-30 μm. The ceramic fibers are preferably alumina fibers with an alpha-alumina content > 99wt%,the diameter is 5-10 μm, and the length is 50-300 μm. The light-cured resin is water-based epoxy acrylate containing a photoinitiator, the viscosity is less than or equal to 270CPS (30 ℃), and the light-cured resin can be cured under the irradiation of ultraviolet light to combine the ceramic powder and the fiber material together.
The preparation method of the ceramic core comprises the following steps:
the sintering temperature of the core in this example is: heating to 200 ℃ and preserving heat for 2h, heating to 500 ℃ and preserving heat for 2h, heating to 1000 ℃ and preserving heat for 2h, then heating to 1200 ℃ and preserving heat for 2h, wherein the heating speed is 30 ℃/h, cooling to room temperature along with the furnace, and then discharging;
the ethyl silicate hydrolysate comprises the following components in percentage by mass: 31.3 percent of ethyl silicate, 25 percent of absolute ethyl alcohol, 1.5 percent of isopropanol, 13 percent of propylene glycol methyl ether, 25.8 percent of acidic silica sol and 0.4 percent of hydrochloric acid (20 percent of mass concentration) which are mixed by a stirrer.
1) Preparing core slurry: adding 90wt% of quartz glass powder, 7wt% of zirconium silicate powder and 3wt% of alumina fiber into a V-shaped mixer, and forcibly stirring and dry-mixing for 3 hours to obtain a ceramic core material; adding water-based epoxy acrylate accounting for 40wt% of the ceramic core material into a planetary ball mill, adding the ceramic core material according to the proportion, and carrying out ball milling and blending for 45min to obtain ceramic core slurry.
2) 3D printing of core biscuit: A3D model of the ceramic core is established through a computer, and then the 3D model is decomposed layer by layer through the computer to be decomposed into a series of two-dimensional models with the thickness of 200 mu m. Inputting the established 3D model data into an ultraviolet light curing 3D printer, setting a printing program, injecting the ceramic core slurry obtained in the step 1) into the 3D printer, and curing, stacking and molding the two-dimensional sheets layer by layer in an ultraviolet light layer-by-layer scanning curing mode to obtain a ceramic core biscuit. Soaking the biscuit in anhydrous ethanol for removing excessive uncured resin, wherein the soaking time is 7min each time, and the cleaning times are 3 times.
3) Secondary curing of the core biscuit: putting the ceramic core biscuit obtained in the step 2) into an ultraviolet curing box to be cured for 3 hours continuously.
4) And (3) core sintering: and (3) placing the ceramic core biscuit obtained in the step 3) into light magnesium oxide powder of a ceramic sagger, and sintering in a core sintering furnace.
5) And (3) core trimming: and (4) blowing powder on the surface of the sintered ceramic core for cleaning, and then detecting and post-modifying the shape by using a core measuring tool.
6) Core strengthening: putting the core into a container filled with ethyl silicate hydrolysate, then placing the container in a negative pressure environment to enable the ethyl silicate hydrolysate to permeate into pores of the core, keeping the soaking time for 2 hours, then placing the core on a rack to be dried for 24 hours, and finally drying the core for 2 hours at 150 ℃ to obtain a final product.
Through detection, the porosity of the ceramic core prepared by the process after sintering is 27.53%, the surface roughness is Ra3.12, the room-temperature bending strength is 54.98MPa, the bending strength at 1500 ℃ is 33.22MPa, and the high-temperature deflection at 1500 ℃ is 0.22 mm; through a decoring test of 8 hours in a decoring kettle with the concentration of the decoring liquid (KOH aqueous solution) of 60wt%, the pressure of 2.8MPa and the temperature of 360 ℃, the dissolution rate of the ceramic core reaches 100 percent. The detection results show that the ceramic core is suitable for directional solidification forming of the high-temperature alloy hollow blade.
Example 3:
the embodiment describes an inorganic fiber composite silicon-based ceramic core based on a 3D printing technology, which is composed of quartz glass powder, a mineralizer, ceramic fibers and a light-cured resin. SiO in quartz glass powder2The content is more than 99wt%, and the particle size distribution is 1-30 μm. The mineralizer is zirconium silicate micropowder, wherein Fe2O3The impurity content is less than 0.1wt%, and the particle size distribution is 1-30 μm. The ceramic fibers are preferably alumina fibers with an alpha-alumina content of > 99wt%, a diameter of 5-10 μm and a length of 50-300 μm. The light-cured resin is water-based polyurethane acrylate containing a photoinitiator, the viscosity is less than or equal to 270CPS (30 ℃), and the light-cured resin can be cured under the irradiation of ultraviolet light to combine the ceramic powder and the fiber material together.
The preparation method of the ceramic core comprises the following steps:
the sintering temperature of the core in this example is: heating to 200 ℃ and preserving heat for 2h, heating to 500 ℃ and preserving heat for 2h, heating to 1000 ℃ and preserving heat for 2h, then heating to 1200 ℃ and preserving heat for 2h, wherein the heating speed is 30 ℃/h, cooling to room temperature along with the furnace, and then discharging;
the ethyl silicate hydrolysate comprises the following components in percentage by mass: 31.3 percent of ethyl silicate, 25 percent of absolute ethyl alcohol, 1.5 percent of isopropanol, 13 percent of propylene glycol methyl ether, 25.8 percent of acidic silica sol and 0.4 percent of hydrochloric acid (20 percent of mass concentration) which are mixed by a stirrer.
1) Preparing core slurry: adding 95wt% of quartz glass powder, 3wt% of zirconium silicate powder and 2wt% of alumina fiber into a V-shaped mixer, and forcibly stirring and dry-mixing for 1h to obtain a ceramic core material; adding water-based polyester acrylate accounting for 30wt% of the ceramic core material into a planetary ball mill, adding the ceramic core material according to the proportion, and carrying out ball milling and blending for 60min to obtain ceramic core slurry.
2) 3D printing of core biscuit: A3D model of the ceramic core is established through a computer, and then the 3D model is decomposed layer by layer through the computer to be decomposed into a series of two-dimensional models with the thickness of 200 mu m. Inputting the established 3D model data into an ultraviolet light curing 3D printer, setting a printing program, injecting the ceramic core slurry obtained in the step 1) into the 3D printer, and curing, stacking and molding the two-dimensional sheets layer by layer in an ultraviolet light layer-by-layer scanning curing mode to obtain a ceramic core biscuit. Soaking the biscuit in anhydrous ethanol for removing excessive uncured resin, wherein the soaking time is 10min each time, and the cleaning times are 2 times.
3) Secondary curing of the core biscuit: putting the ceramic core biscuit obtained in the step 2) into an ultraviolet curing box to be cured for 1 hour.
4) And (3) core sintering: and (3) placing the ceramic core biscuit obtained in the step 3) into light magnesium oxide powder of a ceramic sagger, and sintering in a core sintering furnace.
5) And (3) core trimming: and (4) blowing powder on the surface of the sintered ceramic core for cleaning, and then detecting and post-modifying the shape by using a core measuring tool.
6) Core strengthening: putting the core into a container filled with ethyl silicate hydrolysate, then placing the container in a negative pressure environment to enable the ethyl silicate hydrolysate to permeate into pores of the core, keeping the soaking time for 2 hours, then placing the core on a rack to be dried for 24 hours, and finally drying the core for 2 hours at 150 ℃ to obtain a final product.
Through detection, the porosity of the ceramic core prepared by the process after sintering is 25.68%, the surface roughness is Ra3.19, the room-temperature bending strength is 49.26MPa, the bending strength at 1500 ℃ is 29.54MPa, and the high-temperature deflection at 1500 ℃ is 0.38 mm; through a decoring test of 8 hours in a decoring kettle with the concentration of the decoring liquid (KOH aqueous solution) of 60wt%, the pressure of 2.8MPa and the temperature of 360 ℃, the dissolution rate of the ceramic core reaches 100 percent. The detection results show that the ceramic core is suitable for directional solidification forming of the high-temperature alloy hollow blade.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (7)
1. An inorganic fiber composite silicon-based ceramic core is characterized in that: carrying out photocuring 3D printing on the core slurry, sintering, and reinforcing with ethyl silicate hydrolysate to obtain the silicon-based ceramic core, wherein the core slurry is composed of quartz glass powder, a mineralizer, ceramic fibers and photocuring resin.
2. The inorganic fiber composite silicon-based ceramic core of claim 1, wherein: SiO in the quartz glass powder2The content is more than 99wt%, and the particle size distribution is 1-30 μm.
3. The inorganic fiber composite silicon-based ceramic core of claim 1, wherein: the mineralizer is zirconium silicate micro powder, wherein Fe2O3The impurity content is less than 0.1wt%, and the particle size distribution is 1-30 μm.
4. The inorganic fiber composite silicon-based ceramic core of claim 1, wherein: the ceramic fiber is alumina fiber with alpha-alumina content over 99wt%, diameter of 5-10 micron and length of 50-300 micron.
5. The inorganic fiber composite silicon-based ceramic core of claim 1, wherein: the photocuring resin is water-based polyurethane acrylate or water-based epoxy acrylate or polyester acrylate containing a photoinitiator, and the viscosity is less than or equal to 270CPS at the temperature of 30 ℃.
6. The inorganic fiber composite silicon-based ceramic core of claim 1, wherein: the ethyl silicate hydrolysate is prepared by mixing the following components: 34.3% of ethyl silicate, 25% of absolute ethyl alcohol, 1.5% of isopropanol, 13% of propylene glycol methyl ether, 25.8% of acidic silica sol and 0.4% of hydrochloric acid with the mass concentration of 20%, wherein the components are in mass percentage.
7. The method of making an inorganic fiber composite silicon-based ceramic core according to any of claims 1-6, comprising the steps of:
preparing core slurry: adding 85-95wt% of quartz glass powder, 3-10wt% of zirconium silicate powder and 2-5wt% of alumina fiber into a mixer, and forcibly stirring and dry-mixing for 2-5h to obtain a ceramic core material; adding light-cured resin accounting for 30-50wt% of the ceramic core material into a planetary ball mill, adding the ceramic core material according to the proportion, and performing ball milling and blending for 30-60min to obtain ceramic core slurry;
3D printing of core biscuit: establishing a 3D model of the ceramic core by a computer, decomposing the 3D model into a series of two-dimensional models with the thickness of 100-;
secondary curing of the core biscuit: putting the core biscuit obtained in the step 2) into an ultraviolet curing box to be cured for 1-5 hours continuously;
and (3) core sintering: placing the core biscuit obtained in the step 3) into light magnesium oxide powder of a ceramic sagger, and sintering in a core sintering furnace, wherein the sintering temperature is as follows: heating to 200 ℃ and preserving heat for 2h, heating to 500 ℃ and preserving heat for 2h, heating to 1000 ℃ and preserving heat for 2h, then heating to 1200 ℃ and preserving heat for 2h, wherein the heating speed is 30 ℃/h, cooling to room temperature along with the furnace, and then discharging;
and (3) core trimming: carrying out surface powder blowing cleaning on the sintered ceramic core, and then detecting and modifying the shape by using a core measuring tool;
core strengthening: and putting the core into a container filled with ethyl silicate hydrolysate, then putting the container in a negative pressure environment to enable the ethyl silicate hydrolysate to permeate into pores of the core, keeping the soaking time for 2 hours, then putting the core on a frame to be dried for 24 hours, and finally drying the core for 2 hours at 150 ℃ to obtain the inorganic fiber composite silicon-based ceramic core.
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