CN115673241A - Material of soluble ceramic shell or ceramic core and preparation method and application thereof - Google Patents
Material of soluble ceramic shell or ceramic core and preparation method and application thereof Download PDFInfo
- Publication number
- CN115673241A CN115673241A CN202211319642.9A CN202211319642A CN115673241A CN 115673241 A CN115673241 A CN 115673241A CN 202211319642 A CN202211319642 A CN 202211319642A CN 115673241 A CN115673241 A CN 115673241A
- Authority
- CN
- China
- Prior art keywords
- core
- ceramic shell
- ceramic
- shell
- sintering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to a soluble ceramic shell or ceramic core and a preparation method and application thereof, belonging to the related technical field of rapid casting. The method comprises the following steps: (1) Preparing a ceramic shell/core primary blank by adopting a 3DP forming process, and heating, curing, sol impregnating and drying the ceramic shell/core primary blank to obtain a ceramic shell or ceramic core blank; (2) Placing the ceramic blank into a high-temperature sintering furnace for sintering, and cooling along with the furnace to obtain a soluble ceramic shell or a soluble ceramic core; wherein the shell/core material used in the molding process is calcium carbonate. The ceramic shell/core is prepared by the 3DP forming process, the process is simple, the production period is short, the support is not needed, and the ceramic shell/core is suitable for forming the large-scale ceramic shell/core with the complex structure.
Description
Technical Field
The invention belongs to the related technical field of rapid casting, and particularly relates to a soluble ceramic shell or ceramic core and a preparation method and application thereof, in particular to a soluble ceramic shell/core for titanium alloy casting based on 3DP molding and a preparation method thereof.
Background
The titanium alloy has the advantages of small density, high specific strength, long fatigue life, good corrosion resistance, high temperature resistance, good strength and rigidity matching with the composite material and the like, and is widely applied to the fields of aerospace, energy and chemical industry, medical care and the like. The processing difficulty is high due to the problems of high chemical activity, low plasticity, low thermal conductivity and the like of the titanium alloy in the modes of forging, welding and the like, and the investment casting technology well solves the problems and becomes one of the mainstream methods for preparing the titanium alloy structural member at present. The traditional investment casting technology adopts materials such as a wax mould and a resin mould to prepare a part model, and then processes such as slurry coating, drying, sanding, demoulding, roasting and the like and a pouring process are carried out to obtain the precision part. However, in the traditional investment casting technology, the preparation of the ceramic shell/core needs a plurality of working procedures, the production period is long, the production cost is high, the production process is complex, and the method has great limitation when forming large-scale complex ceramic shells/cores, and is difficult to meet the production requirements of the current society. Therefore, how to simplify the production process, shorten the production period and reduce the preparation cost is a problem which needs to be solved urgently at present.
The additive manufacturing technology is a process of slicing a 3D model of a part under the control of a computer, printing layer by layer and finally forming a complete part, the ceramic shell/core can be directly formed by using the technology, and the ceramic shell/core suitable for the pouring requirement is obtained through the processes of drying, degreasing, sintering and the like, so that the production period is greatly shortened, and the production cost is reduced. The additive manufacturing techniques commonly used for producing ceramic shells/cores at present include photocuring molding techniques, selective laser sintering techniques, layered extrusion molding techniques, etc., but these techniques are more or less faced with problems such as high equipment cost, low surface precision of ceramic shells/cores, and the need for supporting large and complex components to be molded. Compared with the additive manufacturing technology, the 3DP forming technology does not need laser or auxiliary heating forming, has the advantages of wide material, high forming precision, no support, environmental protection and the like, is wide in application field, and has great potential in preparing ceramic shells/cores.
In the preparation of ceramic shell/core, the traditional material for preparing ceramic shell/core for titanium alloy casting mainly comprises ZrO 2 、Y 2 O 3 CaO, etc. which can avoid violent interface reaction between the ceramic shell/core and the titanium alloy during casting to avoid affecting casting precision and reducing casting performance. However, these materials still have some problems, such as ZrO 2 And Y 2 O 3 The price is high, the production cost is greatly increased, and the ceramic shell/core is difficult to remove after casting; although the CaO shell/core can be hydrolyzed to remove the shell, caO can easily absorb water in the preparation process, so that the shell/core is cracked, and the use is influenced. Therefore, there is a need to develop a method for preparing a soluble ceramic shell/core material suitable for titanium alloy casting, which can solve the problems of the preparation technology and the ceramic shell/core material and meet the industrial production requirements.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a soluble ceramic shell or ceramic core formed based on droplet jet bonding and a preparation method and application thereof, wherein the ceramic shell or ceramic core is made of CaCO 3 After full sintering, the CaO can be completely decomposed and directly dissolved by water, the ceramic shell or the ceramic core can be scattered and easily separated from the casting, the later shelling procedure is greatly simplified, and the dissolution product Ca (OH) 2 The solubility is low, most of the solution can form precipitate, the later recovery treatment is convenient, and simultaneously, compared with the direct printing by adopting CaO, caCO 3 The volume change of the powder caused by moisture absorption and wetting in the printing process can be avoided, and the cracking of the ceramic shell or the ceramic core is prevented.
According to a first aspect of the invention, there is provided a method of making a dissolvable ceramic shell or core, comprising the steps of:
(1) Calcium carbonate powder is used as a raw material, a micro-droplet jetting bonding forming process is adopted to prepare a ceramic shell or ceramic core primary blank, and then heating curing, infiltration and drying are carried out to obtain a ceramic shell or ceramic core blank body;
(2) And (2) sintering the ceramic shell or ceramic core blank obtained in the step (1) to enable calcium carbonate to react to generate calcium oxide, so as to obtain the soluble ceramic shell or ceramic core.
Preferably, in the step (2), the sintering is divided into two stages, namely sintering for 1 to 3 hours at 900 to 1000 ℃, and then sintering for 2 to 3 hours at 1300 to 1500 ℃, wherein the heating rate in the sintering process is 2 to 5 ℃/min.
Preferably, in the step (1), the temperature for heating and curing is 190-205 ℃ and the time is 2-4 h.
Preferably, in the step (1), solute molecules in the impregnation solution used for impregnation are not decomposed at 1500 ℃ or higher; solute components of the infiltration liquid do not react with structural parts in the casting process; the infiltration liquid is used for infiltrating pores among calcium carbonate powder, keeping the shape of the ceramic shell or the ceramic core complete, avoiding the collapse of a green body in the sintering process and enhancing the strength of the sintered green body.
Preferably, in the step (1), the infiltration liquid is nano ZrO 2 At least one of the dispersion liquid or the yttrium sol, and the infiltration time is 30 s-3 min.
Preferably, the particle size of the calcium carbonate powder is 325-800 meshes; the adhesive used in the microdroplet spray adhesive forming process is phenolic resin; the printing parameters are as follows: the printing layer is 0.05 mm-0.20 mm high, and the adhesive saturation is 70% -140%.
According to another aspect of the present invention, there is provided a dissolvable ceramic shell or core made by any of the methods described herein.
According to another aspect of the invention there is provided the use of a dissolvable ceramic shell or core in a cast structure.
Preferably, the structural member is made of titanium alloy, cast steel, cast iron, aluminum alloy or magnesium alloy.
Preferably, after the casting is completed, the structural member with the ceramic shell or the ceramic core is put into water, and the ceramic shell or the ceramic core is cracked and dispersed when reacting with water and is separated from the structural member, so that the shelling procedure is completed.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
(1) The invention adopts the micro-droplet jet bonding forming process to prepare the ceramic shell/core, can solve the limitation of the traditional process in forming the large ceramic shell/core with a complex structure, shortens the production period, reduces the production cost and meets the production requirements of the social market. Meanwhile, compared with other additive manufacturing technologies, the droplet jet bonding forming process does not need laser or auxiliary heating forming, and has the advantages of wide material, high forming precision, no support, environmental friendliness and the like, and the application field is wide.
(2) The invention adopts CaCO 3 The prepared ceramic shell/core is fully sintered CaCO 3 The casting with the ceramic shell/core can be fully soaked in hot water in a shelling procedure after pouring because the CaO can react with water, and the ceramic shell/core can be hydrolyzed and dispersed and is easily separated from the casting; thereby utilizing ZrO 2 、Y 2 O 3 The ceramic shell/core prepared by the materials is usually subjected to shell removal in a mode of striking by applying external force after casting, which wastes time and labor, so that CaCO is adopted 3 The preparation of the ceramic shell/core can greatly simplify the later shelling procedure. The CaO ceramic shell/core dissolution process comprises the following steps:
CaO+H 2 O＝Ca(OH) 2
during this reaction, a large amount of heat is evolved, and Ca (OH) is a reaction product 2 The solubility is small, only 1.65g/L at 20 ℃, and the solubility is reduced along with the increase of the temperature, so most of Ca (OH) 2 Can form precipitate, is convenient for later recovery and treatment, has little pollution, is environment-friendly and has wide application prospect.
(3) According to the invention, the ceramic shell/core needs to be subjected to infiltration treatment before high-temperature sintering, and the effect of the method is that the infiltration liquid can enter gaps of calcium carbonate powder, so that the strength of the ceramic shell/core is improved; the shape of the ceramic shell/core can be maintained after the binder is completely decomposed, and collapse is avoided; solute components in the infiltration liquid can also avoid interface reaction with titanium alloy in the pouring process, and the quality of castings is ensured.
(4) The invention adopts CaCO 3 Compared with the ceramic shell/core prepared by directly adopting CaO, the ceramic shell/core prepared by the method can avoid the volume change of powder caused by moisture absorption and dampness of the powder exposed in the air in the printing process, and prevent the cracking of the ceramic shell/core. In addition, with ZrO 2 、Y 2 O 3 CaCO, compared to other ceramic powders 3 Low price, wide source and huge development potential.
Based on the preparation characteristics of the soluble ceramic shell/core, the invention researches and designs the soluble ceramic shell/core preparation method which has the advantages of simple preparation process, no need of support in the forming process, low cost and convenient later-stage shell removal. The method adopts the micro-droplet spraying bonding forming process to prepare the soluble ceramic shell/core, can solve the limitation of the traditional process in forming the large ceramic shell/core with the complex structure, shortens the production period, reduces the production cost, has the advantages of wide material, high forming precision, no support, environmental protection and the like, and has wide application field; and has low price, wide source and huge development potential.
Drawings
FIG. 1 is a schematic flow diagram of a method of making a dissolvable ceramic shell/core according to the present invention.
FIG. 2 is a pictorial representation of a ceramic test sample constructed in accordance with the present invention, wherein a sample is impregnated with silica sol and b sample is impregnated with nano ZrO 2 And (4) impregnating the dispersion liquid.
FIG. 3 is a pictorial representation of a ceramic sample subjected to a collapsibility test.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, a method for preparing a soluble ceramic shell/core based on droplet jet bonding molding mainly comprises the following steps:
(1) Putting calcium carbonate powder into a powder cylinder, introducing a ceramic shell/core three-dimensional structure model, adjusting printing parameters, and printing a ceramic shell/core primary blank;
(2) Putting the printed primary blank and the powder bed into a drying box for heating and curing;
(3) Taking out the solidified blank from the powder bed, removing clean powder for sol infiltration, and then putting the blank into a drying oven for low-temperature drying;
(4) And (4) sintering the ceramic shell/core blank obtained in the step (3) to enable calcium carbonate to react and decompose to generate calcium oxide, and thus obtaining the soluble ceramic shell/core.
Further, in the step (1), the particle size of the calcium carbonate powder is 325 to 800 meshes.
Further, in the step (4), the sintering is divided into two stages, namely sintering for 1-3 h at 700-1000 ℃, and then sintering for 2-3 h at 1300-1500 ℃, wherein the heating rate in the sintering process is 2-5 ℃/min.
Further, in the step (2), the heating and curing temperature is 160-220 ℃, and the time is 2-5 h.
Further, in the step (3), the infiltration solution used for infiltration can stably exist at high temperature; solute components of the infiltration liquid do not react with the titanium alloy in the casting process; after the infiltration liquid is infiltrated into pores among the calcium carbonate powder, the complete shape of the ceramic shell/core can be kept, and the effects of blank collapse and ceramic shell/core strength construction in the sintering process are avoided.
Further, the infiltration liquid is nano ZrO 2 One or a mixture of the dispersion liquid and the yttrium sol, and the impregnation time is 30 s-3 min.
Further, in the step (1), the binder used in the droplet spraying, bonding and forming process is phenolic resin; the printing parameters are as follows: the printing layer is 0.05 mm-0.20 mm high, and the adhesive saturation is 70% -140%.
Binder saturation (Bs) is one of the important influencing parameters in droplet ejection printing processes, and is defined as the single layer binder volume (V) binder ) Occupy the void volume (V) in the corresponding powder layer air ) The expression of (c) is as follows:
where ρ is Pile up Is the bulk density of the powder; rho True Is the true density of the powder; s is the single-layer printing area; h is the lamination thickness.
The invention also provides the soluble ceramic shell/core, which is prepared by the preparation method of the soluble ceramic shell/core. The soluble ceramic shell/core is mainly applied to pouring of structural parts, and can also be used for pouring of structural parts made of cast steel, cast iron, aluminum alloy and magnesium alloy materials. After the casting is finished, the structural member with the ceramic shell/core is placed into hot water, the ceramic shell/core is cracked and dispersed when reacting with water, and is easily separated from the structural member, so that the shelling procedure is finished.
The invention is described in further detail below with reference to several specific embodiments.
Example 1
The preparation method of the soluble ceramic shell/core provided by the embodiment 1 of the invention mainly comprises the following steps:
s1, drying 325-mesh calcium carbonate powder for printing at 80 ℃ for 12 hours, taking out the powder and sieving the powder. And then the screened calcium carbonate powder is fully paved in a powder supply cylinder, a stainless steel plate is placed on the surface of the working cylinder, a layer of ceramic powder is paved, a designed three-dimensional structural model of the ceramic shell/core is introduced into a computer, printing parameters are adjusted, a spray head starts to spray phenolic resin adhesive according to a path of computer slicing, after the spray head finishes ink jet once, the working cylinder can descend by one layer thickness, the powder supply cylinder rises by one layer thickness, the powder paving process is finished through the autorotation and the movement of a powder paving roller, and the operation is repeated in sequence, so that the whole printing process of the ceramic shell/core is finished. Wherein, the printing parameters of the 3D printing equipment are as follows: the printed layer is 0.15mm high and the binder saturation is 80%.
S2, after printing is finished, firstly, removing redundant powder on the edge of the stainless steel plate, placing the stainless steel plate in a drying box to be heated and solidified at 205 ℃, closing the drying box after solidification for 4 hours, and taking out the stainless steel plate after furnace cooling. Next, the powder around the ceramic shell/core blank is removed with a spatula, the blank is removed from the powder bed, and the residual powder on the ceramic shell/core blank is cleaned with a brush. Subsequently, the ceramic shell/core blank was placed in a pot, into which 40% nano-ZrO was poured 2 And (3) timing after all parts of the blank are completely impregnated by the dispersion liquid, taking out the impregnated ceramic shell/core blank after 3min, placing the ceramic shell/core blank in a tray, putting the ceramic shell/core blank in a drying box at 70 ℃, drying for 6h, and taking out the ceramic shell/core blank.
And S3, sintering the ceramic shell/core blank body in a burying sintering mode, uniformly paving 0.2mm of plate-shaped corundum powder on a special ceramic plate for sintering, then placing the dried ceramic shell/core blank body on the ceramic plate, completely burying each part of the blank body by using the plate-shaped corundum powder, then placing the blank body into a high-temperature sintering furnace, sintering for 3h at 1000 ℃, sintering for 2h at 1400 ℃, sintering at the temperature rise rate of 2 ℃/min, and finally, cooling along with the furnace to obtain the soluble ceramic shell/core for titanium alloy casting.
Example 2
The preparation method of the soluble ceramic shell/core provided by the embodiment 2 of the invention mainly comprises the following steps:
s1, drying 500-mesh calcium carbonate powder for printing at 90 ℃ for 10 hours, taking out the powder and sieving the powder. And then the screened calcium carbonate powder is fully paved in a powder supply cylinder, a stainless steel plate is placed on the surface of the working cylinder, a layer of ceramic powder is paved, a designed three-dimensional structural model of the ceramic shell/core is introduced into a computer, printing parameters are adjusted, a spray head starts to spray the binder according to a path of computer slicing, after the spray head finishes one-time ink jet, the working cylinder descends by one layer thickness, the powder supply cylinder ascends by one layer thickness, the powder paving process is finished through the autorotation and the movement of a powder paving roller, and the operation is repeated in sequence, so that the whole printing process of the ceramic shell/core is finished. Wherein, the printing parameters of the 3D printing equipment are as follows: the print layer height is 0.12mm and the binder saturation is 100%.
And S2, after printing is finished, firstly, removing redundant powder on the edge of the stainless steel plate, placing the stainless steel plate in a drying box, heating and curing at 200 ℃, closing the drying box after curing for 3h, and taking out the stainless steel plate after furnace cooling. Next, the powder around the ceramic shell/core blank is removed with a spatula, the blank is taken out of the powder bed, and the residual powder on the ceramic shell/core blank is cleaned with a brush. Subsequently, the ceramic shell/core blank was placed in a pot, into which 30% nano-ZrO was poured 2 And (3) timing after all parts of the blank are completely impregnated by the dispersion liquid, taking out the impregnated ceramic shell/core blank after 2min, placing the ceramic shell/core blank in a tray, placing the ceramic shell/core blank in a drying box at 60 ℃, drying for 5h, and taking out the ceramic shell/core blank.
S3, uniformly paving 0.2mm plate-shaped corundum powder on a special ceramic plate for sintering by adopting an embedding and sintering mode, then placing the dried ceramic shell/core blank on the ceramic plate, completely embedding all parts of the blank by using the plate-shaped corundum powder, then placing the blank into a high-temperature sintering furnace, sintering for 2h at 950 ℃, sintering for 2h at 1350 ℃, sintering at the temperature rise rate of 3 ℃/min, and finally cooling along with the furnace to obtain the soluble ceramic shell/core for titanium alloy casting.
Example 3
The preparation method of the soluble ceramic shell/core provided by the embodiment 3 of the invention mainly comprises the following steps:
s1, drying 600-mesh calcium carbonate powder for printing at 100 ℃ for 8 hours, taking out the powder and sieving the powder. And then the screened calcium carbonate powder is fully paved in a powder supply cylinder, a stainless steel plate is placed on the surface of the working cylinder, a layer of ceramic powder is paved, a designed three-dimensional structural model of the ceramic shell/core is introduced into a computer, printing parameters are adjusted, a spray head starts to spray the binder according to a path of computer slicing, after the spray head finishes one-time ink jet, the working cylinder descends by one layer thickness, the powder supply cylinder ascends by one layer thickness, the powder paving process is finished through the autorotation and the movement of a powder paving roller, and the operation is repeated in sequence, so that the whole printing process of the ceramic shell/core is finished. Wherein, the printing parameters of the 3D printing equipment are as follows: the print layer height is 0.10mm and the binder saturation is 120%.
And S2, after printing is finished, firstly, removing redundant powder on the edge of the stainless steel plate, placing the stainless steel plate in a drying box, heating and curing at 195 ℃, closing the drying box after curing for 2 hours, and taking out the stainless steel plate after furnace cooling. Next, the powder around the ceramic shell/core blank is removed with a spatula, the blank is taken out of the powder bed, and the residual powder on the ceramic shell/core blank is cleaned with a brush. Subsequently, the ceramic shell/core blank was placed in a pot, into which 15% nano-ZrO was poured 2 And (3) timing after all parts of the blank are completely impregnated by the dispersion liquid, taking out the impregnated ceramic shell/core blank after 1.5min, placing the ceramic shell/core blank in a tray, putting the ceramic shell/core blank in a drying box at 50 ℃, drying for 4h, and taking out the ceramic shell/core blank.
And S3, sintering the ceramic shell/core blank body in a burying sintering mode, uniformly paving 0.2mm of plate-shaped corundum powder on a special ceramic plate for sintering, then placing the dried ceramic shell/core blank body on the ceramic plate, completely burying each part of the blank body by using the plate-shaped corundum powder, then placing the blank body into a high-temperature sintering furnace, sintering for 1h at 900 ℃, sintering for 1.5h at 1300 ℃, and sintering at the temperature rise rate of 3 ℃/min, and finally cooling along with the furnace to obtain the soluble ceramic shell/core for titanium alloy casting.
Application examples
The impeller is an important component in an engine, and is widely applied to the fields of automobiles, aerospace and the like at present. Taking the preparation of an impeller as an example, a soluble impeller shell is prepared according to the method in the above specific embodiment, the impeller shell is placed in a pressure casting device, molten titanium alloy liquid is poured into a sprue above the shell by using a crucible, and then the shell is filled with the titanium alloy by pressurizing. And after cooling, taking out the cast impeller shell and putting the impeller shell into hot water for fully soaking. And after the ceramic shell material on the surface is completely collapsed, taking the impeller out of the water, cleaning the residual ceramic on the impeller, wiping off water, and drying in a drying oven to obtain the impeller casting.
Impregnation comparative example
The bar sample obtained after sintering with 325 mesh calcium carbonate constructed as in example 1, wherein bar sample a was impregnated with silica sol for 3min and bar sample b was impregnated with nano ZrO 2 Soaking the dispersion for 3min. As can be seen from FIG. 2, the long sample a impregnated with silica sol was greatly changed in shape after sintering, while nano ZrO was used 2 The shape of the dispersion-impregnated strip sample b was kept intact, and no dishing occurred. Further, the long sample a was broken when it was taken out of the sintering furnace, whereby it was found that the strength was far inferior to that of the case of using nano ZrO 2 The bar sample b impregnated with the dispersion solution shows that the silica sol is not suitable for the impregnation of the calcium carbonate ceramic shell/core blank and the nano ZrO 2 The dispersion can well keep the shape of the blank body and prevent the blank body from being broken, and is suitable for the infiltration of the calcium carbonate ceramic shell/core blank body.
Test examples
(1) Collapsibility test
The two beakers were filled with hot water and then respectively placed in the test ceramic samples. The two samples are prepared by utilizing a microdroplet jet bonding forming process, the parameters of other forming processes except the raw materials are the same, the raw material of the ceramic sample in the beaker a is 800 meshes of alumina, the raw material of the ceramic sample in the beaker b is 800 meshes of calcium carbonate, and the calcium carbonate is completely decomposed into calcium oxide after sintering. After 40min in hot water, the two test sample states are shown in fig. 3. As can be seen from FIG. 3, after 40min, the sample in the beaker a did not collapse, and the shape and strength were not significantly different from those before the sample was placed in hot water; and b, the sample in the beaker is completely dispersed and dissolved, and meets the expected requirement.
(2) Strength test
The samples of examples 1, 2, 3 were subjected to flexural strength tests and the data obtained are given in the following table:
it will be understood by those skilled in the art that the foregoing is only an exemplary embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, since various modifications, substitutions and improvements within the spirit and scope of the invention are possible and within the scope of the appended claims.
Claims (10)
1. A method for preparing a soluble ceramic shell or core, comprising the steps of:
(1) Calcium carbonate powder is used as a raw material, a micro-droplet jetting bonding forming process is adopted to prepare a ceramic shell or ceramic core primary blank, and then heating curing, infiltration and drying are carried out to obtain a ceramic shell or ceramic core blank body;
(2) And (2) sintering the ceramic shell or ceramic core blank obtained in the step (1) to enable calcium carbonate to react to generate calcium oxide, so as to obtain the soluble ceramic shell or ceramic core.
2. The method for preparing the soluble ceramic shell or core according to claim 1, wherein in the step (2), the sintering is divided into two stages, namely sintering at 900-1000 ℃ for 1-3 h, and then sintering at 1300-1500 ℃ for 2-3 h, wherein the heating rate during sintering is 2-5 ℃/min.
3. The method for preparing the soluble ceramic shell or core according to claim 1, wherein in the step (1), the temperature for heating and curing is 190 ℃ to 205 ℃ and the time is 2h to 4h.
4. The method for preparing a soluble ceramic shell or core according to claim 1, wherein in step (1), the solute molecules in the impregnation solution used for impregnation are not decomposed at 1500 ℃ or less; solute components of the infiltration liquid do not react with structural parts in the casting process; the infiltration liquid is used for infiltrating pores among the calcium carbonate powder, keeping the shape of the ceramic shell or the ceramic core complete, avoiding the collapse of a green body in the sintering process and enhancing the strength of the sintered green body.
5. As claimed in claim4, the preparation method of the soluble ceramic shell or the soluble ceramic core is characterized in that in the step (1), the infiltration liquid is nano ZrO 2 At least one of the dispersion liquid or yttrium sol, and the impregnation time is 30 s-3 min.
6. The method of making a soluble ceramic shell or core according to claim 1, wherein said calcium carbonate powder has a particle size of 325 mesh to 800 mesh; the adhesive used in the microdroplet spray adhesive forming process is phenolic resin; the printing parameters are as follows: the printing layer is 0.05 mm-0.20 mm high, and the adhesive saturation is 70% -140%.
7. Soluble ceramic shells or cores obtainable by the process according to any one of claims 1 to 6.
8. Use of a dissolvable ceramic shell or core according to claim 7 in cast structural members.
9. The use according to claim 8, wherein the structural member is made of titanium alloy, cast steel, cast iron, aluminum alloy or magnesium alloy.
10. The use according to claim 8 or 9, wherein after casting, the structural member with the ceramic shell or core is placed in water, and the ceramic shell or core reacts when it encounters water and breaks apart, separating from the structural member, completing the process of removing the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211319642.9A CN115673241A (en) | 2022-10-26 | 2022-10-26 | Material of soluble ceramic shell or ceramic core and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211319642.9A CN115673241A (en) | 2022-10-26 | 2022-10-26 | Material of soluble ceramic shell or ceramic core and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115673241A true CN115673241A (en) | 2023-02-03 |
Family
ID=85099058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211319642.9A Pending CN115673241A (en) | 2022-10-26 | 2022-10-26 | Material of soluble ceramic shell or ceramic core and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115673241A (en) |
-
2022
- 2022-10-26 CN CN202211319642.9A patent/CN115673241A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102039375B (en) | Method for quickly manufacturing high-temperature alloy hollow blade casting | |
| JP5249447B1 (en) | Foundry sand for 3D laminate molding | |
| CN109734425B (en) | Laser selective rapid forming method of complex phase ceramic casting mold and product thereof | |
| CN103752769B (en) | Based on the solvent casting method of sugared mould | |
| WO2017114064A1 (en) | Method for preparing environmentally friendly fine casting mould shell | |
| CN107200597A (en) | A kind of Direct Coagulation Casting preparation method of the complicated porous ceramics of high porosity | |
| WO2017114065A1 (en) | Method for preparing environmentally friendly casting material | |
| CN107790624A (en) | A kind of method that evaporative pattern is prepared using 3DP printing techniques | |
| CN113461412B (en) | Core-shell integrated casting mold with controllable gap and preparation method and application thereof | |
| CN103223466A (en) | Rapid metal die manufacturing method for turbine blades | |
| CN113996759B (en) | Aluminum lithium alloy casting adopting shell to inhibit interface reaction and casting method thereof | |
| CN108296449B (en) | Microwave curing forming system for water-soluble salt core | |
| CN110143819A (en) | A kind of indirect free forming method of complexity ceramic structures | |
| CN101700568B (en) | Low pressure casting method for lattice sandwich plate | |
| CN108515147B (en) | Rapid forming method of infrared pre-cured water-soluble salt core | |
| CN111097875B (en) | Casting process of inner chill for accelerated solidification and cooling of thick and large investment castings | |
| CN111203514A (en) | Precision casting method for high-temperature alloy complex thin-wall casting | |
| CN108380825B (en) | Rapid forming method for microwave-cured water-soluble salt core | |
| US20150273571A1 (en) | Precision casting mold and method of producing the same | |
| CN115673241A (en) | Material of soluble ceramic shell or ceramic core and preparation method and application thereof | |
| JP2007030027A (en) | Method for forming water soluble core, and method for casting aluminum alloy | |
| JP4485343B2 (en) | Method and apparatus for forming water-soluble core | |
| CN109420736B (en) | Coating composition for casting 3D sand mold printing | |
| CN114180945A (en) | Additive manufacturing method for ceramic core-type shell integrated piece | |
| CN1895816B (en) | Lost-wax casting process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |