CN118026691A - Preparation method of pressureless sintered silicon carbide ceramic sheet - Google Patents
Preparation method of pressureless sintered silicon carbide ceramic sheet Download PDFInfo
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 52
- 239000000919 ceramic Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 64
- 238000005266 casting Methods 0.000 claims abstract description 27
- 239000002270 dispersing agent Substances 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 21
- 239000000178 monomer Substances 0.000 claims abstract description 19
- 239000003054 catalyst Substances 0.000 claims abstract description 18
- 239000003999 initiator Substances 0.000 claims abstract description 18
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 12
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 239000002033 PVDF binder Substances 0.000 claims abstract description 10
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 10
- 239000011268 mixed slurry Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 229910021642 ultra pure water Inorganic materials 0.000 claims abstract description 4
- 239000012498 ultrapure water Substances 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 239000012528 membrane Substances 0.000 claims abstract description 3
- 238000002791 soaking Methods 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 17
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 11
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical group [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 claims description 10
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 7
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 claims description 7
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 7
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical group C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 7
- 239000011259 mixed solution Substances 0.000 claims description 6
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 claims description 5
- 238000003828 vacuum filtration Methods 0.000 claims description 5
- 238000009775 high-speed stirring Methods 0.000 claims description 4
- 210000001161 mammalian embryo Anatomy 0.000 claims description 2
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000000967 suction filtration Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 description 10
- 238000005245 sintering Methods 0.000 description 8
- 239000000654 additive Substances 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 239000007787 solid Substances 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910052580 B4C Inorganic materials 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 3
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 3
- 239000013530 defoamer Substances 0.000 description 3
- 239000000375 suspending agent Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- KIDHWZJUCRJVML-UHFFFAOYSA-N putrescine Chemical compound NCCCCN KIDHWZJUCRJVML-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical group [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 239000000908 ammonium hydroxide Substances 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
- C04B2235/6023—Gel casting
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- C04B2235/606—Drying
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- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/66—Specific sintering techniques, e.g. centrifugal sintering
- C04B2235/668—Pressureless sintering
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Abstract
The application relates to a preparation method of a pressureless sintered silicon carbide ceramic sheet, which comprises the following steps: preparing gel casting slurry: mixing a monomer, a cross-linking agent, a dispersing agent and a pH value regulator with ultrapure water to obtain a premix, and stirring the premix at a high speed to obtain a mixed slurry; preparing a blank: adding a catalyst into the prepared mixed slurry, removing bubbles in vacuum, adding an initiator to obtain a prefabricated mixture, and injecting the prefabricated mixture into a mold for gel curing to obtain a blank; drying the green body: and placing the demoulded blank body at a polyvinylidene fluoride membrane for vacuum suction filtration, then placing the blank body into a polyethylene glycol solution with high molecular weight for soaking, and finally taking out the blank body and placing the blank body into a constant temperature drying oven for heating and drying to obtain the silicon carbide sheet. The application has the effects of improving production efficiency and reducing production cost.
Description
Technical Field
The application relates to the field of preparation of silicon carbide thin plates, in particular to a preparation method of a pressureless sintered silicon carbide ceramic thin plate.
Background
The silicon carbide ceramic has the characteristics of excellent normal-temperature mechanical property, high bending strength, good corrosion resistance, high abrasion resistance and the like, and is widely applied to the fields of chemical industry and the like.
At present, the preparation method of the pressureless silicon carbide ceramic sheet is usually extrusion molding and casting molding, wherein the silicon carbide ceramic sheet prepared by extrusion molding has low density, and casting molding is not suitable for ceramic sheets with the thickness of about 5mm, so that gel casting molding is the best experimental scheme for preparing the pressureless silicon carbide ceramic sheet. Gelcasting is a relatively new near net shape ceramic forming process for manufacturing various industry advanced structural ceramic parts, the gelcasting slurry begins to gel after casting in a mold, forming a uniform wet cast containing about one tenth of its mass of water, which is then removed by drying. After drying, binder removal and sintering may be performed simultaneously.
Gel moisture removal is the longest stage in the gel casting process, because liquid is slowly transported in a porous solid medium, and the blank is easily defective due to air drying, so that the production is seriously affected; at present, the main liquid drying technology of gel casting wet billets adopts ethanol for drying, so that not only is the danger coefficient higher, but also ethanol molecules easily permeate into ceramic wet billets, so that the drying is not thorough, and the drying effect of the billets is not very good, so that the improvement is needed.
Disclosure of Invention
In order to solve the problems, the application provides a preparation method of a pressureless sintered silicon carbide ceramic sheet.
The preparation method of the pressureless sintered silicon carbide ceramic sheet provided by the application adopts the following technical scheme:
a preparation method of a pressureless sintered silicon carbide ceramic thin comprises the following steps:
Preparing gel casting slurry: mixing a monomer, a cross-linking agent, a dispersing agent and a pH value regulator with ultrapure water to obtain a premix, and stirring the premix at a high speed to obtain a mixed slurry;
preparing a blank: adding a catalyst into the prepared mixed slurry, removing bubbles in vacuum, adding an initiator to obtain a prefabricated mixture, and injecting the prefabricated mixture into a mold for gel curing to obtain a blank;
Drying the green body: and placing the demoulded blank body at a polyvinylidene fluoride (PVDF) membrane for vacuum filtration, then placing the blank body into a polyethylene glycol solution with high molecular weight for soaking, and finally taking out the blank body and placing the blank body into a constant temperature drying oven for heating and drying to obtain the silicon carbide sheet.
Through adopting above-mentioned technical scheme, at the in-process that the body carries out the drying, place the body after the vacuum suction filtration in the polyethylene glycol solution of high molecular weight and carry out liquid drying, can effectively reduce the phenomenon that liquid molecule permeated in the wet base of ceramic to promoted the drying effect of body, simultaneously, made the body dry evenly, effectively reduced the emergence of the phenomenon such as deformation, fracture, warpage take place for the carborundum sheet in the preparation in-process, further promoted the product quality of the carborundum ceramic sheet of preparation.
Preferably, in the step of preparing gel casting slurry, the monomer is any one of acrylamide and methacrylamide, and the cross-linking agent is N, N-methylene bisacrylamide; the pH value regulator is tetramethyl ammonium hydroxide; the pH value of the premix solution in the step is 10-11.
By adopting the technical scheme, the acrylamide is used as a monomer, and the N, N-methylene bisacrylamide is used as a cross-linking agent, so that the stability of the silicon carbide powder can be effectively improved in the subsequent cross-linking and curing process, and the quality of the prepared silicon carbide ceramic sheet product is effectively improved.
Preferably, the monomer accounts for 2-5% of the total mass of the powder, the cross-linking agent accounts for 5-10% of the total mass of the monomer, and the dispersing agent accounts for 0.1-0.3% of the total mass of the powder.
By adopting the technical scheme, the quality of the monomer, the cross-linking agent and the dispersing agent is controlled within the range, so that the stability of the silicon carbide ceramic system can be improved.
Preferably, in the step of preparing the gel casting slurry, the high-speed stirring time of the mixed solution is 15min, and the high-speed stirring rotating speed of the mixed solution is 480-420r/min.
By adopting the technical scheme, the stirring time of the mixed solution is controlled within the range, and the stirring speed of the mixed solution is controlled within the range, so that each component of the prepared gel casting slurry can be dispersed more uniformly.
Preferably, in the step of preparing the embryo body, the catalyst comprises tetramethyl ethylenediamine, and the initiator comprises ammonium persulfate.
By adopting the technical scheme, the tetramethyldiamine is used as a catalyst, and the ammonium persulfate is used as an initiator, so that the overall stability of the silicon carbide powder can be improved.
Preferably, the catalyst accounts for 0.1-0.5% of the total mass of the powder, and the initiator accounts for 1-5% of the total mass of the powder.
By adopting the technical scheme, the mass ratio of the catalyst to the initiator is controlled within the range, so that the performance of the catalyst and the initiator can be further improved.
Preferably, in the step of drying the green body, the green body is placed at the PVDF film for vacuum filtration for 30min.
Preferably, in the step of drying the green body, the molecular weight of polyethylene glycol is 10000 or 20000, and the volume concentration of polyethylene glycol is 10% -30%.
Preferably, in the step of drying the green body, the green body is dried in a constant temperature and humidity drying box under the conditions that the humidity is 15% -25% RH, the drying temperature is 60-120 ℃ and the drying time is 12-24 hours.
In summary, the present application includes at least one of the following beneficial technical effects:
1. According to the application, when the silicon carbide ceramic thin plate is prepared, vacuum filtration and drying are adopted, and the polyethylene glycol solution with high molecular weight is soaked, so that the drying effect of the blank body is improved, the blank body is dried more uniformly, and meanwhile, the phenomena of deformation, cracking, warping and the like of the silicon carbide thin plate in the preparation process are reduced, and the product quality of the prepared silicon carbide thin plate is further improved;
2. The silicon carbide ceramic sheet prepared by gel casting has excellent comprehensive performance and meets the industrial requirements, and meanwhile, the silicon carbide ceramic sheet prepared by the method has the advantages of low production cost, high production efficiency and high finished product quality.
Drawings
FIG. 1 is a schematic view showing the whole body of the green body prepared in example 3 after drying in the method for preparing a pressureless sintered silicon carbide ceramic sheet according to the present application.
FIG. 2 is a schematic view showing a state in which a green body prepared in example 3 is dried and then placed on a flat surface in a method for preparing a pressureless sintered silicon carbide ceramic sheet according to the present application.
FIG. 3 is a schematic view showing a state in which a green body prepared in comparative example 1 is dried and then placed on a flat surface in a method for preparing a pressureless sintered silicon carbide ceramic sheet according to the present application.
Detailed Description
The embodiment of the application discloses a preparation method of a pressureless sintered silicon carbide ceramic sheet, which is further described in detail by combining with the embodiment:
Example 1
Preparing gel casting slurry:
4.8g of monomer, 0.48g of cross-linking agent, 0.15g of mixed dispersing agent, pH value regulator and 30g of ultrapure water are mixed to prepare a premix solution, and the pH value of the premix solution is regulated to 10; weighing 150g of superfine silicon carbide powder, adding other additives to ensure that the solid content of a system reaches 50% to obtain a silicon carbide mixture, weighing 0.9g of boron carbide and 3g of carbon black, mixing to obtain a sintering aid, mixing the premixed solution with the silicon carbide mixture and the sintering aid, and stirring at a rotating speed of 500r/min for 15min to obtain gel casting slurry.
Wherein the monomer is acrylamide, the cross-linking agent is N, N-methylene bisacrylamide, the pH value regulator is ammonium hydroxide of four seasons, the mixed dispersing agent is purchased from Sima Huagong (Buddha) limited company, and the mass ratio of the dispersing agent 5088 to the dispersing agent BYK333 is 1:1 preparing a mixed dispersing agent; the additive auxiliary agent is defoamer and suspending agent.
Preparing a blank: and adding 0.45g of catalyst into the gel casting slurry, removing bubbles in vacuum, adding 3g of initiator, stirring, and injecting into a mold for gel curing.
Wherein the catalyst is tetramethyl ethylenediamine and the initiator is ammonium persulfate.
Drying the green body: demolding the solidified green body, placing the demolded green body on a PVDF film, carrying out vacuum suction filtration for 30min, placing the suction-filtered green body in a polyethylene glycol solution with the molecular weight of 20000 and the volume concentration of 30% for liquid drying, drying for 2h, drying the green body in a constant temperature and humidity drying oven, controlling the humidity of the drying oven to be 25% RH, and the drying temperature to be 120 ℃ and the drying time to be 12h, thus obtaining the silicon carbide ceramic sheet.
Example 2
Preparing gel casting slurry:
6.9g of monomer, 0.95g of cross-linking agent, 0.15g of dispersing agent, pH regulator and 30g of pure water are mixed to prepare a premix solution, and the pH value of the premix solution is regulated to 10; 150g of silicon carbide ultrafine powder is weighed, other additives are added to enable the solid content of a system to reach 50% to obtain a silicon carbide mixture, 1.5g of boron carbide and 1.5g of carbon black are weighed and mixed to obtain a sintering aid, the premixed liquid is mixed with the silicon carbide mixture and the sintering aid, and the mixture is stirred for 15min at a rotating speed of 500r/min to obtain gel casting slurry.
Wherein the monomer is acrylamide, the cross-linking agent is N, N-methylene bisacrylamide, the pH value regulator is tetramethyl ammonium hydroxide, the mixed dispersing agent is purchased from Sima Huagong (Buddha) limited company, and the mass ratio of the dispersing agent 5088 to the dispersing agent BYK333 is 1:1 preparing a mixed dispersing agent; the additive auxiliary agent is defoamer and suspending agent.
Preparing a blank: and adding 0.45g of catalyst into the prepared gel casting slurry, removing bubbles in vacuum, adding 3g of initiator, stirring, and injecting into a mold for gel curing.
Wherein the catalyst is tetramethyl ethylenediamine and the initiator is ammonium persulfate.
Drying the green body: demolding the solidified green body, placing the demolded green body on a PVDF film, carrying out vacuum suction filtration for 30min, placing the suction-filtered green body in polyethylene glycol solution with molecular weight of 10000 and volume concentration of 30% for liquid drying, drying for 2h, drying the green body in a constant temperature and humidity drying oven, controlling the humidity of the drying oven to be 15% RH, and drying at 60 ℃ for 12h to obtain the silicon carbide ceramic sheet.
Example 3
Preparing gel casting slurry:
6.9g of monomer, 0.95g of cross-linking agent, 0.15g of dispersing agent, pH regulator and 30g of pure water are mixed to prepare a premix solution, and the pH value of the premix solution is regulated to 10; 150g of silicon carbide ultrafine powder is weighed, other additives are added to enable the solid content of a system to reach 50% to obtain a silicon carbide mixture, 1.2g of boron carbide and 2.2g of carbon black are weighed and mixed to obtain a sintering aid, the premixed liquid is mixed with the silicon carbide mixture and the sintering aid, and the mixture is stirred for 15min at a rotating speed of 500r/min to obtain gel casting slurry.
Wherein the monomer is acrylamide, the cross-linking agent is N, N-methylene bisacrylamide, the pH value regulator is tetramethyl ammonium hydroxide, the mixed dispersing agent is purchased from Sima Huagong (Buddha) limited company, and the mass ratio of the dispersing agent 5088 to the dispersing agent BYK333 is 1:1 preparing a mixed dispersing agent; the additive auxiliary agent is defoamer and suspending agent.
Preparing a blank:
And adding 0.45g of catalyst into the prepared gel casting slurry, removing bubbles in vacuum, adding 3g of initiator, stirring, and injecting into a mold for gel curing.
Wherein the catalyst is tetramethyl diamine and the initiator is ammonium persulfate.
Drying the green body: demolding the solidified green body, placing the demolded green body on a PVDF film, carrying out vacuum suction filtration for 30min, placing the suction-filtered green body in a polyethylene glycol solution with the molecular weight of 20000 and the volume concentration of 30% for liquid drying, drying for 2h, placing the green body in a constant temperature and humidity drying oven for drying, controlling the humidity of the drying oven to be 20% RH, and the drying temperature to be 90 ℃ and the drying time to be 12h, thus obtaining the silicon carbide ceramic sheet.
Comparative example 1
Preparing gel casting slurry:
6.9g of monomer, 0.95g of cross-linking agent, 0.15g of dispersing agent, pH regulator and 30g of pure water are mixed to prepare a premix solution, and the pH value of the premix solution is regulated to 10; weighing 150g of silicon carbide ultrafine powder, adding other additives such as a defoaming agent and the like to enable the solid content of a system to reach 50% to obtain a silicon carbide mixture, mixing the premixed solution with the silicon carbide mixture and a sintering aid, and stirring at a rotating speed of 500r/min for 15min to obtain gel casting molding slurry.
Wherein the monomer is acrylamide, the cross-linking agent is N, N-methylene bisacrylamide, and the pH value regulator is tetramethyl ammonium hydroxide.
Preparing a blank:
And adding 0.45g of catalyst into the prepared gel casting slurry, removing bubbles in vacuum, adding 3g of initiator, stirring, and injecting into a mold for gel curing.
Wherein the catalyst is tetramethyl ethylenediamine and the initiator is ammonium persulfate.
Drying the green body:
And demolding the solidified green body, placing the demolded green body on a PDVF film, carrying out vacuum suction filtration for 30min, placing the suction-filtered green body in an ethanol solution with the volume concentration of 80% for liquid drying, drying for 2h, placing the green body in a constant temperature and humidity drying oven for drying, controlling the humidity of the drying oven to be 20% RH, and the drying temperature to be 90 ℃ and the drying time to be 12h, thus obtaining the silicon carbide ceramic sheet.
The present embodiment is merely illustrative of the present application, and the present application is not limited thereto, and a worker can make various changes and modifications without departing from the scope of the technical idea of the present application. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of claims.
Claims (9)
1. A preparation method of a pressureless sintered silicon carbide ceramic sheet is characterized by comprising the following steps: the method comprises the following steps:
Preparing gel casting slurry: mixing a monomer, a cross-linking agent, a dispersing agent and a pH value regulator with ultrapure water to obtain a premix, and stirring the premix at a high speed to obtain a mixed slurry;
preparing a blank: adding a catalyst into the prepared mixed slurry, removing bubbles in vacuum, adding an initiator to obtain a prefabricated mixture, and injecting the prefabricated mixture into a mold for gel curing to obtain a blank;
Drying the green body: and placing the demoulded blank body at a polyvinylidene fluoride (PVDF) membrane for vacuum filtration, then placing the blank body into a polyethylene glycol solution with high molecular weight for soaking, and finally taking out the blank body and placing the blank body into a constant temperature drying oven for heating and drying to obtain the silicon carbide sheet.
2. The method for preparing the pressureless sintered silicon carbide ceramic sheet according to claim 1, wherein: in the gel casting slurry prepared by the steps, the monomer is any one of acrylamide and methacrylamide, and the cross-linking agent is N, N-methylene bisacrylamide; the pH value regulator is tetramethyl ammonium hydroxide; the pH value of the premix solution in the step is 10-11.
3. The method for preparing the pressureless sintered silicon carbide ceramic sheet according to claim 2, wherein: the monomer accounts for 2-5% of the total mass of the powder, the cross-linking agent accounts for 5-10% of the total mass of the monomer, and the dispersing agent accounts for 0.1-0.3% of the total mass of the powder.
4. The method for preparing the pressureless sintered silicon carbide ceramic sheet according to claim 1, wherein: in the step of preparing the gel casting slurry, the high-speed stirring time of the mixed solution is 15min, and the high-speed stirring rotating speed of the mixed solution is 480-420r/min.
5. The method for preparing the pressureless sintered silicon carbide ceramic sheet according to claim 1, wherein: in the preparation of the embryo body, the catalyst comprises tetramethyl ethylenediamine, and the initiator comprises ammonium persulfate.
6. The method for preparing the pressureless sintered silicon carbide ceramic sheet according to claim 5, wherein: the catalyst accounts for 0.1-0.5% of the total mass of the powder, and the initiator accounts for 1-5% of the total mass of the powder.
7. The method for preparing the pressureless sintered silicon carbide ceramic sheet according to claim 1, wherein: in the step of drying the green body, the green body is placed at the PVDF film for vacuum filtration for 30min.
8. The method for preparing the pressureless sintered silicon carbide ceramic sheet according to claim 1, wherein: in the step of drying the green body, the molecular weight of polyethylene glycol is 10000 or 20000, and the volume concentration of polyethylene glycol is 10% -30%.
9. The method for preparing the pressureless sintered silicon carbide ceramic sheet according to claim 1, wherein: in the step of drying the green body, the drying environment of the green body in a constant temperature and humidity drying box is 15-25% RH, the drying temperature is 60-120 ℃, and the drying time is 12-24h.
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