CN110734278A - Hollow blade ceramic core material, preparation method thereof and method for manufacturing hollow blade ceramic core by using material - Google Patents
Hollow blade ceramic core material, preparation method thereof and method for manufacturing hollow blade ceramic core by using material Download PDFInfo
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- CN110734278A CN110734278A CN201911003679.9A CN201911003679A CN110734278A CN 110734278 A CN110734278 A CN 110734278A CN 201911003679 A CN201911003679 A CN 201911003679A CN 110734278 A CN110734278 A CN 110734278A
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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
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/14—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silica
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B33Y70/00—Materials specially adapted for additive manufacturing
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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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
- C04B2235/3248—Zirconates or hafnates, e.g. zircon
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
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Abstract
The invention discloses hollow blade ceramic core materials for 3D printing, a preparation method thereof and a method for manufacturing the hollow blade ceramic core by using the materials, and is characterized in that a modifier zircon is added into a traditional formula for 3D printing pure silicon oxide ceramic, so that the high-temperature performance of a 3D printing silicon oxide ceramic product is obviously improved, the average high-temperature bending strength of 1340 ℃ is increased from 6.72MPa of pure silicon oxide to 24.76MPa, steps are carried out, the alkaline boiling and decoring effects of the hollow blade ceramic core manufactured by using the materials are optimized, and the alkaline boiling and decoring time of a turbine blade is shortened from about 30 days to 2 days.
Description
Technical Field
The invention belongs to the technical field of precision casting, relates to a precision casting mold, and particularly relates to hollow blade ceramic core materials, a preparation method thereof and a method for manufacturing the hollow blade ceramic core by using the materials.
Background
For the cooling structure of the new turbine blade, a development trend is toward a hollow blade having a double-walled cooling structure. The cooling blade structure is characterized in that the double-layer wall is provided with a plurality of small cold air channels, so that the inside of the blade has a large heat exchange area, and the cooling effect is improved. For the preparation of the hollow blade with the double-wall cooling structure, the key point is to prepare the ceramic core meeting the requirement. The traditional method for processing the ceramic core is hot-pressing injection molding, a mold is required to be opened firstly in the traditional hot-pressing molding process, the mold period is 2-4 months, the molding process is that a base material and a mineralizer are uniformly mixed, then ceramic biscuit is obtained after hot-pressing injection molding, and the ceramic core is obtained by sintering the biscuit. In the traditional method, a mould is indispensable, the multi-layer cavity type structure still needs to be subjected to partitioning and assembling, the process flow is complex, the precision is difficult to guarantee in the assembling process, and a complex core is difficult to manufacture.
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.
The technical means is that the cast blade is put into caustic soda solution to be boiled, the heated caustic soda solution is used for eroding the ceramic core in the inner cavity of the hollow blade to enable the ceramic core to become particles, the particles escape from micropores of the blade and enter the caustic soda solution, the process is commonly called alkaline boiling depoling, the alkaline boiling depoling is a very slow process, the depoling time is related to the size and the material of the ceramic core, the larger the size is, the longer the depoling time is, the pure silica ceramic core is easier to depoling, the pure alumina ceramic core is relatively difficult to depoling, and the pure silica ceramic core is taken as an example of a turbine blade, the depoling time of the pure silica ceramic core is usually about 2 days, but the pure alumina ceramic core is very difficult to depoling.
Then, whether types of 3D printing inner cavity core materials which can ensure the high-temperature performance requirement and are easy to separate can be found | is the problem which is urgently solved by the invention.
Disclosure of Invention
The invention aims to to provide hollow blade inner cavity core materials which can meet the requirement of high temperature performance and are easy to be subjected to alkaline boiling and core removal.
The second purpose of the invention is to provide methods for preparing the hollow blade inner cavity core material.
The third purpose of the invention is to provide methods for manufacturing the ceramic core of the hollow blade inner cavity by using the materials.
In order to achieve the purpose, the invention adopts the following technical scheme:
kinds of hollow blade ceramic core materials are composed of the following components by mass ratio:
72-78 acrylic monomers
2.5-3.5 parts of sodium polyacrylate
Polyether-modified polydimethylsiloxane 14-18
Benzoin dimethyl ether 14-18
90-95% of silicon oxide
5-10% of zircon
Proper amount of pH regulator.
The pH regulator is dilute hydrochloric acid.
The grain diameter of the silicon oxide and the zircon is less than 10 mu m.
The preparation method of the hollow blade ceramic core material comprises the following steps:
1) mixing acrylic acid monomer, sodium polyacrylate, polyether modified polydimethylsiloxane and benzoin dimethyl ether, uniformly stirring, slowly dripping a pH regulator into the mixture in the stirring process, and regulating the pH value to 7 to prepare a premixed solution;
2) mixing the silicon oxide powder and the zirconite powder, and uniformly stirring to prepare silicon oxide and zirconite composite powder;
3) and slowly adding the silicon oxide and zirconite composite powder into the premix while stirring, and continuously stirring after the powder is added until no obvious particles or sedimentation exists, thereby obtaining a paste material.
The method for manufacturing the ceramic core of the hollow blade by using the paste material comprises the following steps:
1) filling the paste material into a material groove of a 3D printer, starting an in-groove stirring system, and stirring again until the paste material presents a smooth feeling;
2) setting a printing mode of the 3D printer to enable the printing mode to conform to the outline shape of the inner cavity of the hollow blade;
3) starting up to print, and obtaining an inner cavity core blank which is consistent with the contour shape of the inner cavity of the hollow blade;
4) transferring the inner cavity core blank to a temporary transfer warehouse in a dark place, storing the inner cavity core blank in the dark place for 12 hours, and entering a sintering process;
5) and sintering the inner cavity core blank to finally obtain the inner cavity ceramic core of the hollow blade.
The invention has the beneficial effects that:
compared with pure silicon oxide ceramics, the obtained novel ceramic material not only obviously improves the high-temperature performance of the ceramic product made of the material, but also improves the average high-temperature bending strength of 1340 ℃ for 30min from 6.72MPa to 24.76MPa of the pure silicon oxide, and compared with the pure silicon oxide ceramics, the novel ceramic material optimizes the alkali boiling decoring effect of the ceramic core in the inner cavity of the hollow workpiece by taking a turbine blade as an example, the alkali boiling decoring time is shortened to 2 days from the original 30 days, the process time is greatly shortened, the energy consumption is reduced, the environmental protection condition is improved, the time of a worker staying in the alkali boiling decoring environment of the hollow workpiece is reduced, and the health of the worker is facilitated.
Detailed Description
The invention is described in detail below with reference to examples.
preparing the components according to the following mass ratio
Acrylic acid monomer 75 parts
3 parts of sodium polyacrylate
Polyether modified polydimethylsiloxane 16 parts
Benzoin dimethyl ether 16 parts
92 parts of silicon oxide with particle size of 6-10 mu m
8 parts of zirconite with particle size of 6-10 mu m
A proper amount of a pH regulator of diluted hydrochloric acid with the concentration of 1.5 percent.
Secondly, preparing a hollow blade ceramic core material according to the following steps:
1) mixing acrylic acid monomer, sodium polyacrylate, polyether modified polydimethylsiloxane and benzoin dimethyl ether, stirring uniformly, slowly dripping dilute hydrochloric acid with the concentration of 1.5% in the stirring process, and adjusting the pH value to 7 to prepare a premixed solution;
2) mixing the silicon oxide powder and the zirconite powder, and uniformly stirring to prepare silicon oxide and zirconite composite powder;
3) and slowly adding the silicon oxide and zirconite composite powder into the premix while stirring, and continuously stirring after the powder is added until no obvious particles or sedimentation exists, thereby obtaining a paste material.
Thirdly, manufacturing the hollow blade ceramic core by using the paste material according to the following steps:
1) filling the paste material into a material groove of a 3D printer, starting an in-groove stirring system, and stirring again until the paste material presents a smooth feeling;
2) setting a printing mode of the 3D printer to enable the printing mode to conform to the outline shape of the inner cavity of the hollow blade;
3) starting up to print, and obtaining an inner cavity core blank which is consistent with the contour shape of the inner cavity of the hollow blade;
4) transferring the inner cavity core blank to a temporary transfer warehouse in a dark place, storing the inner cavity core blank in the dark place for 12 hours, and entering a sintering process;
5) and sintering the inner cavity core blank to finally obtain the ceramic core which is consistent with the inner cavity contour of the hollow blade.
The technical scheme of the invention is not only suitable for manufacturing the turbine blade, but also suitable for manufacturing any other hollow workpiece.
Claims (5)
1, kinds of hollow blade ceramic core materials, which are composed of the following components by mass ratio:
72-78 acrylic monomers
2.5-3.5 parts of sodium polyacrylate
Polyether-modified polydimethylsiloxane 14-18
Benzoin dimethyl ether 14-18
90-95% of silicon oxide
5-10% of zircon
Proper amount of pH regulator.
2. The hollow vane ceramic core material of claim 1 wherein the PH adjuster is dilute hydrochloric acid.
3. A hollow blade ceramic core material as claimed in claim 1 wherein the silica, zircon, and silica particles have a particle size of less than 10 μm.
4, A method for preparing the ceramic core material of hollow vane of any of claims 1-3, comprising the steps of:
1) mixing acrylic acid monomer, sodium polyacrylate, polyether modified polydimethylsiloxane and benzoin dimethyl ether, stirring uniformly, dripping a pH regulator into the mixture, and regulating the pH value to 7 to prepare a premixed solution;
2) mixing the silicon oxide powder and the zirconite powder, and uniformly stirring to prepare silicon oxide and zirconite composite powder;
3) and slowly adding the silicon oxide and zirconite composite powder into the premix while stirring, and continuously stirring uniformly after the powder is added until no obvious particles or sedimentation exists, thereby obtaining a paste material.
5, a method of making a ceramic core for a hollow blade from the paste of claim 4, comprising the steps of:
1) filling the paste material into a material groove of a 3D printer, starting an in-groove stirring system, and stirring again until the paste material presents a smooth feeling;
2) setting a printing mode of the 3D printer to enable the printing mode to conform to the outline shape of the inner cavity of the hollow blade;
3) starting up to print, and obtaining a ceramic core blank which is consistent with the outline shape of the hollow blade inner cavity;
4) transferring the ceramic core blank to a temporary transfer warehouse in a dark place, storing the ceramic core blank in the dark place for no more than 12 hours, and entering a sintering process;
5) and sintering the ceramic core blank to finally obtain the ceramic core which is consistent with the inner cavity contour of the hollow blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911003679.9A CN110734278A (en) | 2019-10-22 | 2019-10-22 | Hollow blade ceramic core material, preparation method thereof and method for manufacturing hollow blade ceramic core by using material |
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| CN201911003679.9A CN110734278A (en) | 2019-10-22 | 2019-10-22 | Hollow blade ceramic core material, preparation method thereof and method for manufacturing hollow blade ceramic core by using material |
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| CN110734278A true CN110734278A (en) | 2020-01-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113860859A (en) * | 2021-10-29 | 2021-12-31 | 康硕(德阳)智能制造有限公司 | 3D printing silicon oxide ceramic slurry formula and silicon oxide powder preparation process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113860859A (en) * | 2021-10-29 | 2021-12-31 | 康硕(德阳)智能制造有限公司 | 3D printing silicon oxide ceramic slurry formula and silicon oxide powder preparation process thereof |
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