CN108840673A - Shell based on vitreous silica, resistance to deformation - Google Patents
Shell based on vitreous silica, resistance to deformation Download PDFInfo
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- CN108840673A CN108840673A CN201810926293.4A CN201810926293A CN108840673A CN 108840673 A CN108840673 A CN 108840673A CN 201810926293 A CN201810926293 A CN 201810926293A CN 108840673 A CN108840673 A CN 108840673A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B35/16—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 silicates other than clay
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/043—Removing the consumable pattern
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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
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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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
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- C—CHEMISTRY; METALLURGY
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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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- 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
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/94—Products characterised by their shape
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/95—Products characterised by their size, e.g. microceramics
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Abstract
The present invention relates to the shells based on vitreous silica, resistance to deformation, including shell surface layer and multilayer shell backing layer, shell surface layer solidifies connecting shaping by shell surface layer slurry and surface layer sanding material, the partial size of preparation slurry zirconium English powder in the shell surface layer slurry is 300 mesh to 1250 mesh, the aggregate of surface layer stucco layer is zirconium English powder, and partial size is 100 to 150 mesh；Shell backing layer solidifies connecting shaping by shell backing layer slurry and backing layer sanding material, prepare slurry fused quartz powder and the partial size of tekite sand in the shell backing layer slurry are 100 mesh to 1250 mesh, the aggregate of backing layer stucco layer is quartz sand, and partial size is 10 to 50 mesh；The surface layer slurry of shell uses zirconium English powder, and the backing layer slurry vitreous silica minimum using the coefficient of expansion, the shell thermal expansion coefficient of acquisition is small, and the partial size of powder used in strict control, to reduce the difference of thermal expansion coefficient between shell surface layer and shell backing layer.
Description
Technical field
The present invention relates to Investment casting technology fields, particularly the shell based on vitreous silica, resistance to deformation.
Background technique
With the promotion of efficiency of energy utilization, the component based on complicated pneumatic principle or fluid-dynamic design is increasingly
It is more, it is complex-shaped, for the more demanding of integraty and precision.Model casting can integral precision casting to go out shape extremely multiple
Miscellaneous part, therefore become the main method even unique method for producing complicated metal component.Due to precision-investment casting
Journey has the characteristics that long flow path, process are more, influence factor is complicated, obtains near net-shaped casting not a duck soup.It is many in model casting
In process, there are three big critical processes to be affected the size of casting and deformation, respectively wax-pattern preparation, shell preparation, casting
Solidification.The deformation of wax-pattern stage size is easy to control, and the interaction of metal and shell is to casting in casting pouring and cooling procedure
The contraction distortion influence of part is very big, and one side shell will be led to again by the thermal shock and mechanical shock of metal, another aspect metal
Cross shell cooling and solidification.Therefore, investment shell intensity is not high and softening transform is to cause casting deformation major reason.Metal pours
After note, the coefficient of thermal expansion of shell is bigger, and the solidification shrinkage deformation of casting is bigger.
The complicated ring-like casting of high temperature alloy large thin-wall is the common critical component such as aero-engine, combustion engine, due to size
Greatly, structure is complicated, metallurgical quality and dimension precision requirement are high, and the cast temperature of these alloy-steel castings generally 1400~
1600 DEG C, therefore very high requirement is proposed to quality of investment shell in investment casting process.But there are casting for existing process for making shell
The disadvantages of shrinking percentage of casting is larger, and casting forming effect is undesirable.Casting structure is more complicated, and the contraction from wax-pattern to metal is got over
It can be influenced by structural factor, and under normal conditions, there is no analytic solutions mathematically.Therefore, in mold design, casting is each
The different shrinking percentages at a position can make mold design become complex, the disadvantage being difficult to control so as to cause dimensional accuracy；Together
When since easily to occur maturing temperature or soaking time the shell surface less than caused by use crude for shell, especially
High temperature alloy large thin wall casting manufacturing field, influences surface quality of continuous castings, causes casting cleaning difficult, since shell surface is miscellaneous
Matter not can be removed, therefore shell after baking easily causes Shell cracking, can not recycle, increase manufacturing cost.
Therefore, it is necessary to improve to the shell preparation process of the complicated ring-like casting of high temperature alloy large thin-wall, make it
Meets the needs of casting.The thermal stress and investment shell intensity of casting process medium casting be not high, shell hot mastication is that casting is caused to receive
The main reason for contracting is big, deformation.So thermal expansion coefficient is small, the big shell of resistance capacity to deformation for aviation thin-section casting extremely
It closes important.
Summary of the invention
The purpose of the present invention is to provide a kind of nearly zero-shrinkage shell and preparation method thereof based on vitreous silica, which exists
Thermal expansion coefficient under hot conditions has stronger resistance capacity to deformation, obtained casting accuracy is high close to zero.
The technical scheme is that a kind of nearly zero-shrinkage shell based on vitreous silica, prefabricated including being tightly attached to
The shell surface layer on cere surface and the multilayer shell backing layer being tightly attached on the outside of shell surface layer, the shell surface layer are starched by shell surface layer
Material and surface layer sanding material solidify connecting shaping, and the shell surface layer pulp components include silica solution, zirconium English powder, cobalt aluminate, profit
Humectant, defoaming agent and intensive, the aggregate of the surface layer stucco layer are zirconium English powder；The shell backing layer by shell backing layer slurry and
Backing layer sanding material solidifies connecting shaping, and the shell backing layer pulp components include silica solution, fused quartz powder, vitreous silica
Sand, wetting agent, defoaming agent, distilled water and intensive, the aggregate of the backing layer stucco layer are quartz sand；The surface layer slurry of shell makes
The vitreous silica for using the coefficient of expansion minimum with zirconium English powder, backing layer slurry, the shell thermal expansion coefficient of acquisition are small.
Further, the partial size of the preparation slurry zirconium English powder in the shell surface layer slurry is 300 mesh to 1250 mesh, the face
The aggregate of layer stucco layer is zirconium English powder, and partial size is 100 to 150 mesh；Preparation slurry tekite in the shell backing layer slurry
The partial size of English powder and tekite sand is 100 mesh to 1250 mesh, and the aggregate of the backing layer stucco layer is quartz sand, partial size 10
To 50 mesh；Strict control surface layer slurry powder, surface layer hanging sand layer aggregate powder, backing layer slurry powder, backing layer hanging sand layer
The partial size of aggregate powder, to reduce the difference of thermal expansion coefficient between shell surface layer and shell backing layer, the shell of acquisition is more
Uniformly.
Further, the mass percent formula of the shell surface layer slurry includes：Silica solution 15%-20%, cobalt aluminate 5%-
10%, wetting agent 0-0.5%, defoaming agent 0-0.5%, distilled water 0.5%-1.0%, intensive 0.5%-1.0%, surplus are zirconium English powder；Institute
The mass percent formula for stating shell backing layer slurry includes：Silica solution 20%-40%, partial size are the vitreous silica of -300 mesh of 100 mesh
Sand 5%-15%, wetting agent 0-0.5%, defoaming agent 0-0.5%, surplus are the fused quartz powder that partial size is -1250 mesh of 300 mesh；Backing layer
The vitreous silica of 5%-15% being close with the aggregate of shell surface layer stucco layer with diameter of particle is added in slurry, shell can be made
It is easy to bond between surface layer and backing layer, avoids diameter of particle gap excessive, causes shell obtained uneven.
Further, the intensive is the mixture of butadiene-styrene latex, acrylic acid, acrylate, wherein the butadiene-styrene latex
Mass percent be 40%-70%, the mass percent of acrylic acid is 25%-59%, and the mass percent of acrylate is 1%-
10%；After the intensive is added, cracking risk when shell dewaxing can be reduced, while improving the room temperature intensity of shell, increase shell
The porosity of high-temperature roasting improves the high temperature venting rate of shell, reduces the risk of quartzy phase transformation Shell cracking after primary roasting, can
To wash shell process after increasing the primary roasting of shell, reduce casting is mingled with risk, conducive to the recycling of shell.
Further, the wetting agent is the mixture of polyoxyethylene ether concentrate and carboxymethyl cellulose, wherein described poly-
The mass percent of ethylene oxide ether is 60%-80%, and the mass percent of carboxymethyl cellulose is 20%-40%；The wetting agent and steaming
Slurry is added after distilled water mixing, the permeability and levelability of slurry can be increased.
Further, the defoaming agent is in n-butanol, n-octyl alcohol, dimethyl silicone polymer or butyl glycol ether phosphate
It is at least one.
The preparation method of above-mentioned nearly zero-shrinkage shell, includes the following steps：
It A, will be dry after wax-pattern mould group surface progress oil removal treatment.
B, shell surface layer slurry is prepared, the silica solution for accounting for slurry weight ratio 15%-20% is added, addition accounts for weight ratio 5%-10%
Cobalt aluminate, be added and account for the wetting agent of weight ratio 0.5%, the defoaming agent for accounting for weight ratio 0-0.5% is added, addition accounts for weight ratio
The intensive of 0.5%-1.0 % is added in the distilled water of 0.5%-1.0 %, and surplus is that zirconium English powder is mixed, stirring to silica solution and
Powder is combined together well, and the viscosity of slurry is made to reach 20-25s, and pH value is greater than 8, obtains surface layer slurry.
C, surface layer slurry is coated on wax-pattern, grain scattering diameter is that the zirconium English powder of 100 to 150 mesh carries out hanging sand, and ensures type
The zirconium English powder on shell surface uniformly, covering comprehensively, 21 ± 5 DEG C of room temperature, humidity 35-75% environment in it is 2-24 hours dry,
In air-dry 2-4 hours, shell surface layer is made.
D, backing layer slurry is prepared, the silica solution for accounting for slurry weight ratio 20%-40% is added, addition accounts for slurry weight ratio 5%-
15%, partial size is the tekite sand of -300 mesh of 100 mesh, and the wetting agent for accounting for weight ratio 0-0.5% is added, and addition accounts for weight ratio 0-
0.5% defoaming agent, surplus are that the fused quartz powder that partial size is -1250 mesh of 300 mesh is mixed, stirring to silica solution and powder
It is combined together well, and the viscosity of slurry is made to reach 10-20s, pH value is greater than 7, obtains backing layer slurry.
E, backing layer slurry is coated in the shell surface layer dried, grain scattering diameter is that the quartz sand of 10 to 50 mesh is hung
Sand, 21 ± 5 DEG C of room temperature, humidity 35-75% environment in dry 2-24 hour, wherein 0.5-1 hours air-dried, shell the 2nd is made
Layer.
F, above steps may be repeated multiple times E, the preparation of completion multilayer shell backing layer；In the last layer of backing layer, backing layer is starched
The viscosity of material is adjusted to 15-18s, and no longer carry out hanging sand, 21 ± 5 DEG C of room temperature, humidity 35%-75% environment in drying it is not low
In 15 hours, slurry seal is completed.
G, using steam dewaxing, then shell is roasted using electric furnace, 900-1000 DEG C of maturing temperature, keeps the temperature 4-6
Hour, shell finished product is made.
Further, the number of repetition of the step E is 8-12 times, so that the shell thickness obtained is more moderate.
Nearly zero-shrinkage shell based on vitreous silica of the invention, the surface layer slurry of shell use zirconium English powder, backing layer slurry
The material vitreous silica minimum using the coefficient of expansion, the shell thermal expansion coefficient of acquisition is small, and strict control surface layer slurry powder,
Surface layer hanging sand layer aggregate powder, backing layer slurry powder, backing layer hanging sand layer aggregate powder partial size, to reduce shell surface layer
The difference of thermal expansion coefficient between shell backing layer, the shell of acquisition are more uniform；It is added 5%-15%'s and type in backing layer slurry
The vitreous silica that the aggregate of shell surface layer stucco layer is close with diameter of particle can make to be easy to viscous between shell surface layer and backing layer
Knot, avoids diameter of particle gap excessive, causes shell obtained uneven；Especially manufactured in high temperature alloy large thin wall casting
Field can preferably prevent deformation and became uneven at casting thin-walled；Using the material of restriction make shell room temperature extremely
The coefficient of expansion of casting pouring temperature part is close to 0, so as to guarantee so that size Control is not restricted by casting labyrinth
While casting dimension accuracy, shell surface compact obtained is smooth, and obtained surface quality of continuous castings is higher, can effectively reduce
The defects of casting is loose, slag inclusion, crackle；After intensive is added, cracking risk when shell dewaxing can be reduced, while improving shell
Room temperature intensity, increase the porosity of shell high-temperature roasting, improve the high temperature venting rate of shell, reduce quartzy phase after primary roasting
The risk for becoming Shell cracking washes shell process after can increasing the primary roasting of shell, and reduce casting is mingled with risk, is conducive to type
The recycling of shell；Wetting agent is added, the permeability and levelability of slurry can be increased.
Specific embodiment
Embodiment 1
The shell for preparing the guide vane casting of K438 high temperature alloy, specifically comprises the following steps：
It A, will be dry after wax-pattern mould group surface progress oil removal treatment；
B, shell surface layer slurry is prepared, according to silica solution 15%, the weight ratio of the zirconium English powder 75% of -1250 mesh of 300 mesh of partial size is carried out
Mixing adds the cobalt aluminate for accounting for weight ratio 7%, and the wetting agent for accounting for weight ratio 0.5% is added, which is that polyoxyethylene ether is dense
The mixture of contracting object and carboxymethyl cellulose, the mass ratio of polyoxyethylene ether and carboxymethyl cellulose is 6 in the wetting agent:4；Add
Enter to account for the n-butanol of weight ratio 0.5%（Other embodiments can be n-octyl alcohol, dimethyl silicone polymer or butyl glycol ether phosphoric acid
At least one of ester）As defoaming agent, the distilled water for accounting for 1.0 % of weight ratio is added, the reinforcement for accounting for 1.0 % of weight ratio is added
Agent, the intensive are the mixture of butadiene-styrene latex, acrylic acid, acrylate, the quality of butadiene-styrene latex, acrylic acid, acrylate
Than being 4:5:1；Stirring to silica solution and powder is combined together well, and the viscosity of slurry is made to reach 20-25s（Use 5#
The measurement of Cai's grace cup）, pH value is adjusted to being not less than 8, obtains surface layer slurry；
C, surface layer slurry is coated on wax-pattern, grain scattering diameter is that the zirconium English powder of 100 to 150 mesh carries out hanging sand, and ensures shell table
The zirconium English powder in face uniformly, covering comprehensively, 21 ± 5 DEG C of room temperature, humidity 35%-75% environment in 2-24 hours dry, apoplexy
It is 2-4 hours dry, shell surface layer is made；
D, backing layer slurry is prepared, according to fused quartz powder 50% that silica solution 40%, partial size are -1250 mesh of 300 mesh, partial size 100
The weight ratio of the tekite sand 9% of -300 mesh of mesh is mixed, and the wetting agent for accounting for weight ratio 0.5% is added, which is poly-
The mass percent of the mixture of ethylene oxide ether concentrate and carboxymethyl cellulose, polyoxyethylene ether and carboxymethyl cellulose is 7:
3；The n-butanol for accounting for weight ratio 0.5% is added（Other embodiments can be n-octyl alcohol, dimethyl silicone polymer or butyl glycol ether
At least one of phosphate）, stirring to silica solution and powder is combined together well, and the viscosity of slurry is made to reach 10-
20s（It is measured using 5# Cai's grace cup）, pH value is adjusted to being not less than 7, obtains backing layer slurry；
E, backing layer slurry being coated in the shell surface layer dried, grain scattering diameter is that the quartz sand of 10 to 50 mesh carries out hanging sand,
21 ± 5 DEG C of room temperature, humidity 35-75% environment in dry 2-24 hour, wherein 0.5-1 hours air-dried, be made the 2nd layer of shell；
F, step E is repeated several times, completes the 3rd layer of preparation to 11th layer shell backing layer；Then the viscosity of backing layer slurry is adjusted
To 15-18s（It is measured using 5# Cai's grace cup）, the preparation of the last layer is carried out to shell backing layer, and no longer carry out hanging sand, in room temperature
21 ± 5 DEG C, it is 20 hours dry in the environment of humidity 35-75%, complete slurry seal；
G, using steam dewaxing, then shell is roasted using electric furnace, 900 DEG C of maturing temperature, keeps the temperature 4-6 hours, be made
Shell finished product.
Using guide vane made from above-mentioned shell, its key position size is measured, measured value is referring to table 1.
1 guide vane size detection result of table
| Dimension | Design size（mm） | Tolerance（mm） | Survey size（mm） | Practical tolerance（mm） |
| It is vented side thickness | 1.12 | ±0.25 | 1.15 | ±0.05 |
| Venturi | 28.57 | ±0.25 | 28.63 | ±0.08 |
| Channel size | 191 | ±0.25 | 189.94 | ±0.1 |
According to above-mentioned measurement result it is found that the guide vane as made from shell of the invention, the dimensional accuracy of key position can
To meet the standard of CT-4, while guaranteeing casting dimension accuracy, shell surface compact obtained is smooth, obtained cast(ing) surface
The defects of quality is higher, can effectively reduce loose casting, slag inclusion, crackle.For needing to carry out the shell of after baking, to
Increase after primary roasting and wash shell process, the shell cleaned up is subjected to after baking, realizes the recycling of shell, reduces casting
Part is mingled with risk and casting cost.
Embodiment 2
The shell for preparing the ring set ring casting of K4169 high temperature alloy, specifically comprises the following steps：
It A, will be dry after wax-pattern mould group surface progress oil removal treatment；
B, shell surface layer slurry is prepared, according to silica solution 20%, the weight ratio of the zirconium English powder 70% of -1250 mesh of 300 mesh of partial size is carried out
Mixing adds the cobalt aluminate for accounting for weight ratio 7%, and the wetting agent for accounting for weight ratio 0.5% is added, which is that polyoxyethylene ether is dense
The mass percent of the mixture of contracting object and carboxymethyl cellulose, polyoxyethylene ether and carboxymethyl cellulose is 6:4；Addition accounts for weight
Measure the n-butanol than 0.5%（Other embodiments can be in n-octyl alcohol, dimethyl silicone polymer or butyl glycol ether phosphate
It is at least one）As defoaming agent, the distilled water for accounting for 1.0 % of weight ratio is added, the intensive for accounting for 1.0 % of weight ratio is added, should add
Strong agent is the mixture of butadiene-styrene latex, acrylic acid, acrylate, butadiene-styrene latex, acrylic acid, acrylate mass percent be
6:3:1；Stirring to silica solution and powder is combined together well, and the viscosity of slurry is made to reach 20-25s（Use 5# Cai's grace
Cup measurement）, pH value is adjusted to being not less than 8, obtains surface layer slurry；
C, surface layer slurry is coated on wax-pattern, grain scattering diameter is that the zirconium English powder of 100 to 150 mesh carries out hanging sand, and ensures shell table
The zirconium English powder in face uniformly, covering comprehensively, 21 ± 5 DEG C of room temperature, humidity 35-75% environment in 2-24 hours dry, apoplexy
It is 2-4 hours dry, shell surface layer is made；
D, backing layer slurry is prepared, according to silica solution 20%, partial size is the fused quartz powder 64% of -1250 mesh of 300 mesh, partial size 100
The tekite sand 15% of -300 mesh of mesh is mixed, and the wetting agent for accounting for weight ratio 0.5% is added, which is polyoxyethylene ether
The mass percent of the mixture of concentrate and carboxymethyl cellulose, polyoxyethylene ether and carboxymethyl cellulose is 6:4；Addition accounts for
The n-butanol of weight ratio 0.5%（Other embodiments can be in n-octyl alcohol, dimethyl silicone polymer or butyl glycol ether phosphate
At least one）, stirring to silica solution and powder is combined together well, and the viscosity of slurry is made to reach 10-20s（It uses
The measurement of 5# Cai's grace cup）, pH value is adjusted to being not less than 7, obtains backing layer slurry；
E, backing layer slurry being coated in the shell surface layer dried, grain scattering diameter is that the quartz sand of 10 to 50 mesh carries out hanging sand,
21 ± 5 DEG C of room temperature, humidity 35%-75% environment in dry 2-24 hour, wherein 0.5-1 hours air-dried, be made the 2nd layer of shell；
F, step E is repeated several times, completes the 3rd layer of preparation to the 9th stratotype shell backing layer；Then by the viscosity of backing layer slurry adjust to
15-18s（It is measured using 5# Cai's grace cup）, the preparation of the last layer is carried out to shell backing layer, and no longer carry out hanging sand, in room temperature 21
± 5 DEG C, it is 20 hours dry in the environment of humidity 35-75%, complete slurry seal；
G, using steam dewaxing, then shell is roasted using electric furnace, 1000 DEG C of maturing temperature, keeps the temperature 4-6 hours, be made
Shell finished product.
Using ring set ring casting made from above-mentioned shell, its key position size is measured, measured value is referring to table
2。
2 ring set ring casting dimension testing result of table
| Dimension | Design size（mm） | Tolerance（mm） | Survey size（mm） | Practical tolerance（mm） |
| Outer ring outer diameter | 348 | ±0.25 | 347.78 | ±0.1 |
| Bore diameter of outer ring | 300 | ±0.25 | 299.96 | ±0.1 |
| Outer ring wall thickness | 2 | ±0.05 | 1.98 | ±0.02 |
According to above-mentioned measurement result it is found that the ring set ring casting as made from shell of the invention, the dimensional accuracy of key position
It can satisfy the standard of CT-4, while guaranteeing casting dimension accuracy, shell surface compact obtained is smooth, obtained casting table
The defects of face quality is higher, can effectively reduce loose casting, slag inclusion, crackle.It is right for needing to carry out the shell of after baking
Increase after primary roasting and wash shell process, the shell cleaned up is subjected to after baking, realizes the recycling of shell, is reduced
Casting is mingled with risk and casting cost.
Embodiment 3
The shell for preparing the nozzle ring casting of K403 high temperature alloy, specifically comprises the following steps：
It A, will be dry after wax-pattern mould group surface progress oil removal treatment；
B, shell surface layer slurry is prepared, according to silica solution 15%, the weight ratio of the zirconium English powder 73% of -1250 mesh of 300 mesh of partial size is carried out
Mixing adds the cobalt aluminate for accounting for weight ratio 10%, and the wetting agent for accounting for weight ratio 0.25% is added, which is polyoxyethylene ether
The mass percent of the mixture of concentrate and carboxymethyl cellulose, polyoxyethylene ether and carboxymethyl cellulose is 8:2；Addition accounts for
The n-butanol of weight ratio 0.25%（Other embodiments can be in n-octyl alcohol, dimethyl silicone polymer or butyl glycol ether phosphate
At least one）As defoaming agent, the distilled water for accounting for weight ratio 1% is added, the intensive for accounting for 0.5 % of weight ratio, the reinforcement is added
Agent be butadiene-styrene latex, acrylic acid, acrylate mixture, butadiene-styrene latex, acrylic acid, acrylate mass ratio be 7:2.5:
0.5；Stirring to silica solution and powder is combined together well, and the viscosity of slurry is made to reach 20-25s（Use 5# Cai's grace cup
Measurement）, pH value is adjusted to being not less than 8, obtains surface layer slurry；
C, surface layer slurry is coated on wax-pattern, grain scattering diameter is that the zirconium English powder of 100 to 150 mesh carries out hanging sand, and ensures shell table
The zirconium English powder in face uniformly, covering comprehensively, 21 ± 5 DEG C of room temperature, humidity 35%-75% environment in 2-24 hours dry, apoplexy
It is 2-4 hours dry, shell surface layer is made；
D, backing layer slurry is prepared, according to silica solution 30%, partial size is the fused quartz powder 64% of -1250 mesh of 300 mesh, partial size 100
The tekite sand 5% of -300 mesh of mesh is mixed, and the wetting agent for accounting for weight ratio 0.5% is added, which is polyoxyethylene ether
The mass percent of the mixture of concentrate and carboxymethyl cellulose, polyoxyethylene ether and carboxymethyl cellulose is 8:2；Addition accounts for
The n-butanol of weight ratio 0.5%（Other embodiments can be in n-octyl alcohol, dimethyl silicone polymer or butyl glycol ether phosphate
At least one）, stirring to silica solution and powder is combined together well, and the viscosity of slurry is made to reach 10-20s（It uses
The measurement of 5# Cai's grace cup）, pH value is adjusted to being not less than 7, obtains backing layer slurry；
E, backing layer slurry being coated in the shell surface layer dried, grain scattering diameter is that the quartz sand of 10 to 50 mesh carries out hanging sand,
21 ± 5 DEG C of room temperature, humidity 35-75% environment in dry 2-24 hour, wherein 0.5-1 hours air-dried, be made the 2nd layer of shell；
F, step E is repeated several times, completes the 3rd layer of preparation to the 9th stratotype shell backing layer；Then by the viscosity of backing layer slurry adjust to
15-18s（It is measured using 5# Cai's grace cup）, the preparation of the last layer is carried out to shell backing layer, and no longer carry out hanging sand, in room temperature 21
± 5 DEG C, it is 20 hours dry in the environment of humidity 35-75%, complete slurry seal；
G, using steam dewaxing, then shell is roasted using electric furnace, 1000 DEG C of maturing temperature, keeps the temperature 4-6 hours, be made
Shell finished product.
Using nozzle ring casting made from above-mentioned shell, its key position size is measured, measured value is referring to table
3。
3 nozzle ring casting dimension of table detects table
| Dimension | Design size（mm） | Tolerance（mm） | Survey size（mm） | Practical tolerance（mm） |
| It is vented side thickness | 1.41 | ±0.07 | 1.39 | ±0.05 |
| Venturi | 20.45 | ±0.2 | 20.4 | ±0.08 |
| Channel size | 98 | ±0.3 | 98.05 | ±0. 1 |
According to above-mentioned measurement result it is found that the nozzle ring casting as made from shell of the invention, the dimensional accuracy of key position
It can satisfy the standard of CT-4, while guaranteeing casting dimension accuracy, shell surface compact obtained is smooth, obtained casting table
The defects of face quality is higher, can effectively reduce loose casting, slag inclusion, crackle.It is right for needing to carry out the shell of after baking
Increase after primary roasting and wash shell process, the shell cleaned up is subjected to after baking, realizes the recycling of shell, is reduced
Casting is mingled with risk and casting cost.
Embodiment 4
On the basis of embodiment 3, have adjusted constituent part proportion prepare K403 high temperature alloy nozzle ring casting shell,
Specifically comprise the following steps：
It A, will be dry after wax-pattern mould group surface progress oil removal treatment；
B, shell surface layer slurry is prepared, according to silica solution 20%, the weight ratio of the zirconium English powder 67% of -1250 mesh of 300 mesh of partial size is carried out
Mixing adds the cobalt aluminate for accounting for weight ratio 10%, and the wetting agent for accounting for weight ratio 0.5% is added, which is polyoxyethylene ether
The mass percent of the mixture of concentrate and carboxymethyl cellulose, polyoxyethylene ether and carboxymethyl cellulose is 7:3；Addition accounts for
The n-butanol of weight ratio 0.5%（Other embodiments can be in n-octyl alcohol, dimethyl silicone polymer or butyl glycol ether phosphate
At least one）As defoaming agent, the distilled water for accounting for weight ratio 1% is added, the intensive for accounting for 1 % of weight ratio, the intensive is added
For butadiene-styrene latex, acrylic acid, acrylate mixture, butadiene-styrene latex, acrylic acid, acrylate mass ratio be 40:59:1；
Stirring to silica solution and powder is combined together well, and the viscosity of slurry is made to reach 20-25s（It is surveyed using 5# Cai's grace cup
Amount）, pH value is adjusted to being not less than 8, obtains surface layer slurry；
C, surface layer slurry is coated on wax-pattern, grain scattering diameter is that the zirconium English powder of 100 to 150 mesh carries out hanging sand, and ensures shell table
The zirconium English powder in face uniformly, covering comprehensively, 21 ± 5 DEG C of room temperature, humidity 35%-75% environment in 2-24 hours dry, apoplexy
It is 2-4 hours dry, shell surface layer is made；
D, backing layer slurry is prepared, according to silica solution 20%, partial size is the fused quartz powder 65% of -1250 mesh of 300 mesh, partial size 100
The tekite sand 14% of -300 mesh of mesh is mixed, and the wetting agent for accounting for weight ratio 0.5% is added, which is polyoxyethylene ether
The mass percent of the mixture of concentrate and carboxymethyl cellulose, polyoxyethylene ether and carboxymethyl cellulose is 7:3；Addition accounts for
The n-butanol of weight ratio 0.5%（Other embodiments can be in n-octyl alcohol, dimethyl silicone polymer or butyl glycol ether phosphate
At least one）, stirring to silica solution and powder is combined together well, and the viscosity of slurry is made to reach 10-20s（It uses
The measurement of 5# Cai's grace cup）, pH value is adjusted to being not less than 7, obtains backing layer slurry；
E, backing layer slurry being coated in the shell surface layer dried, grain scattering diameter is that the quartz sand of 10 to 50 mesh carries out hanging sand,
21 ± 5 DEG C of room temperature, humidity 35-75% environment in dry 2-24 hour, wherein 0.5-1 hours air-dried, be made the 2nd layer of shell；
F, step E is repeated several times, completes the 3rd layer of preparation to the 9th stratotype shell backing layer；Then by the viscosity of backing layer slurry adjust to
15-18s（It is measured using 5# Cai's grace cup）, the preparation of the last layer is carried out to shell backing layer, and no longer carry out hanging sand, in room temperature 21
± 5 DEG C, it is 20 hours dry in the environment of humidity 35-75%, complete slurry seal；
G, using steam dewaxing, then shell is roasted using electric furnace, 1000 DEG C of maturing temperature, keeps the temperature 4-6 hours, be made
Shell finished product.
Using nozzle ring casting made from above-mentioned shell, its key position size is measured, measured value is referring to table
4。
4 nozzle ring casting dimension of table detects table
| Dimension | Design size（mm） | Tolerance（mm） | Survey size（mm） | Practical tolerance（mm） |
| It is vented side thickness | 1.41 | ±0.07 | 1.40 | ±0.05 |
| Venturi | 20.45 | ±0.2 | 20.48 | ±0.08 |
| Channel size | 98 | ±0.3 | 98.02 | ±0. 1 |
According to above-mentioned measurement result it is found that the dimensional accuracy of its key position can satisfy the standard of CT-4.
Embodiment 5
On the basis of embodiment 1, have adjusted constituent part proportion prepare K438 high temperature alloy guide vane casting type
Shell specifically comprises the following steps：
It A, will be dry after wax-pattern mould group surface progress oil removal treatment；
B, shell surface layer slurry is prepared, according to silica solution 18%, the weight ratio of the zirconium English powder 75% of -1250 mesh of 300 mesh of partial size is carried out
Mixing adds the cobalt aluminate for accounting for weight ratio 5%, and the wetting agent for accounting for weight ratio 0.5% is added, which is that polyoxyethylene ether is dense
The mixture of contracting object and carboxymethyl cellulose, the mass ratio of polyoxyethylene ether and carboxymethyl cellulose is 6 in the wetting agent:4；Add
Enter to account for the n-butanol of weight ratio 0.5%（Other embodiments can be n-octyl alcohol, dimethyl silicone polymer or butyl glycol ether phosphoric acid
At least one of ester）As defoaming agent, the distilled water for accounting for 0.5 % of weight ratio is added, the intensive for accounting for weight ratio 0.5% is added,
The intensive be butadiene-styrene latex, acrylic acid, acrylate mixture, butadiene-styrene latex, acrylic acid, acrylate mass ratio be
40:55:5；Stirring to silica solution and powder is combined together well, and the viscosity of slurry is made to reach 20-25s（Use 5# Cai
The measurement of grace cup）, pH value is adjusted to being not less than 8, obtains surface layer slurry；
C, surface layer slurry is coated on wax-pattern, grain scattering diameter is that the zirconium English powder of 100 to 150 mesh carries out hanging sand, and ensures shell table
The zirconium English powder in face uniformly, covering comprehensively, 21 ± 5 DEG C of room temperature, humidity 35%-75% environment in 2-24 hours dry, apoplexy
It is 2-4 hours dry, shell surface layer is made；
D, backing layer slurry is prepared, according to fused quartz powder 55% that silica solution 30%, partial size are -1250 mesh of 300 mesh, partial size 100
The weight ratio of the tekite sand 14% of -300 mesh of mesh is mixed, and the wetting agent for accounting for weight ratio 0.5% is added, which is poly-
The mass percent of the mixture of ethylene oxide ether concentrate and carboxymethyl cellulose, polyoxyethylene ether and carboxymethyl cellulose is 6:
4；The n-butanol for accounting for weight ratio 0.5% is added（Other embodiments can be n-octyl alcohol, dimethyl silicone polymer or butyl glycol ether
At least one of phosphate）, stirring to silica solution and powder is combined together well, and the viscosity of slurry is made to reach 10-
20s（It is measured using 5# Cai's grace cup）, pH value is adjusted to being not less than 7, obtains backing layer slurry；
E, backing layer slurry being coated in the shell surface layer dried, grain scattering diameter is that the quartz sand of 10 to 50 mesh carries out hanging sand,
21 ± 5 DEG C of room temperature, humidity 35%-75% environment in dry 2-24 hour, wherein 0.5-1 hours air-dried, be made the 2nd layer of shell；
F, step E is repeated several times, completes the 3rd layer of preparation to 11th layer shell backing layer；Then the viscosity of backing layer slurry is adjusted
To 15-18s（It is measured using 5# Cai's grace cup）, the preparation of the last layer is carried out to shell backing layer, and no longer carry out hanging sand, in room temperature
21 ± 5 DEG C, it is 20 hours dry in the environment of humidity 355-75%, complete slurry seal；
G, using steam dewaxing, then shell is roasted using electric furnace, 900 DEG C of maturing temperature, keeps the temperature 4-6 hours, be made
Shell finished product.
Using guide vane made from above-mentioned shell, its key position size is measured, measured value is referring to table 1.
5 guide vane size detection result of table
| Dimension | Design size（mm） | Tolerance（mm） | Survey size（mm） | Practical tolerance（mm） |
| It is vented side thickness | 1.12 | ±0.25 | 1.14 | ±0.05 |
| Venturi | 28.57 | ±0.25 | 28.60 | ±0.08 |
| Channel size | 191 | ±0.25 | 189.98 | ±0.1 |
According to above-mentioned measurement result it is found that the dimensional accuracy of its key position can satisfy the standard of CT-4.
Nearly zero-shrinkage shell based on vitreous silica of the invention, backsheet main component is vitreous silica, in type
With during melt cast, the thermal expansion coefficient of ceramic shell is smaller, can preferably prevent the change at casting thin-walled for shell roasting
Shape and became uneven；Make shell in the coefficient of expansion of room temperature to casting pouring temperature part close to 0 using the material of restriction, thus
Size Control can be made not restricted by casting labyrinth, while guaranteeing casting dimension accuracy, shell surface obtained
The defects of fine and close smooth, obtained surface quality of continuous castings is higher, can effectively reduce loose casting, slag inclusion, crackle.It is added and reinforces
After agent, cracking risk when shell dewaxing can be reduced, while improving the room temperature intensity of shell, increase the hole of shell high-temperature roasting
Rate improves the high temperature venting rate of shell, reduces the risk of quartzy phase transformation Shell cracking after primary roasting, can increase the one of shell
Shell process is washed after secondary roasting, reduce casting is mingled with risk, conducive to the recycling of shell.
Obviously, the above embodiment is merely an example for clearly illustrating the present invention, and is not to of the invention
The restriction of embodiment.For those of ordinary skill in the art, it can also be made on the basis of the above description
Its various forms of variation or variation.There is no necessity and possibility to exhaust all the enbodiments.And these belong to this hair
The obvious changes or variations that bright spirit is extended out are still in protection scope of the present invention.
Claims (5)
1. a kind of shell, which is characterized in that including being tightly attached to the shell surface layer on prefabricated cere surface and being tightly attached to shell surface layer
The multilayer shell backing layer in outside, the shell surface layer solidifies connecting shaping by shell surface layer slurry and surface layer sanding material, described
Shell surface layer pulp components include silica solution, zirconium English powder, cobalt aluminate, wetting agent, defoaming agent and intensive, the surface layer stucco layer
Aggregate be zirconium English powder；The shell backing layer solidifies connecting shaping, the shell by shell backing layer slurry and backing layer sanding material
Backing layer pulp components include silica solution, fused quartz powder, tekite sand, wetting agent, defoaming agent, distilled water and intensive, institute
The aggregate for stating backing layer stucco layer is quartz sand；
The wetting agent is the mixture of polyoxyethylene ether concentrate and carboxymethyl cellulose, wherein the matter of the polyoxyethylene ether
Amount percentage is 60%-80%, and the mass percent of carboxymethyl cellulose is 20%-40%.
2. shell according to claim 1, which is characterized in that the preparation slurry zirconium English powder in the shell surface layer slurry
Partial size is 300 mesh to 1250 mesh, and the partial size of the surface layer stucco layer aggregate is 100 to 150 mesh；In the shell backing layer slurry
The partial size for preparing slurry fused quartz powder and tekite sand is 100 mesh to 1250 mesh, the grain of the backing layer stucco layer aggregate
Diameter is 10 to 50 mesh.
3. shell according to claim 2, which is characterized in that the mass percent formula packet of the shell surface layer slurry
It includes：Silica solution 15%-20%, cobalt aluminate 5%-10%, wetting agent 0-0.5%, defoaming agent 0-0.5%, distilled water 0.5%-1.0% reinforce
Agent 0.5%-1.0%, surplus are zirconium English powder；The mass percent formula of the shell backing layer slurry includes：Silica solution 20%-40%,
Partial size is tekite the sand 5%-15%, wetting agent 0-0.5%, defoaming agent 0-0.5% of -300 mesh of 100 mesh, and surplus is that partial size is 300
The fused quartz powder of -1250 mesh of mesh.
4. shell according to claim 3, which is characterized in that the intensive is butadiene-styrene latex, acrylic acid, acrylate
Mixture, wherein the mass percent of the butadiene-styrene latex is 40%-70%, the mass percent of acrylic acid is 25%-59%, third
The mass percent of olefin(e) acid ester is 1%-10%.
5. shell according to claim 1, which is characterized in that the defoaming agent is n-butanol, n-octyl alcohol, poly dimethyl silicon
At least one of oxygen alkane or butyl glycol ether phosphate.
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| CN201610314620.1A CN105903901B (en) | 2016-05-13 | 2016-05-13 | A kind of nearly zero-shrinkage shell and preparation method thereof based on vitreous silica |
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| CN201810926452.0A Active CN108941457B (en) | 2016-05-13 | 2016-05-13 | Preparation method of shell of guide blade casting made of K438 high-temperature alloy |
| CN201810926265.2A Active CN108994258B (en) | 2016-05-13 | 2016-05-13 | Preparation method of shell of K403 high-temperature alloy nozzle ring casting |
| CN201810926293.4A Active CN108840673B (en) | 2016-05-13 | 2016-05-13 | Anti-deformation shell based on fused quartz |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105903901A (en) | 2016-08-31 |
| CN108941457B (en) | 2019-12-31 |
| CN108941457A (en) | 2018-12-07 |
| CN108941456B (en) | 2020-03-31 |
| CN108994258A (en) | 2018-12-14 |
| CN105903901B (en) | 2018-09-07 |
| CN108994258B (en) | 2019-12-24 |
| CN108840673B (en) | 2020-10-09 |
| CN108788015A (en) | 2018-11-13 |
| CN108941456A (en) | 2018-12-07 |
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Denomination of invention: Molded silica based, deformation resistant shell Effective date of registration: 20221025 Granted publication date: 20201009 Pledgee: CITIC Bank Limited by Share Ltd. Shanghai branch Pledgor: Shanghai Wanze Precision Casting Co.,Ltd. Registration number: Y2022310000295 |