CN105598390B - A kind of hollow blade ceramic-mould and its depoling method - Google Patents
A kind of hollow blade ceramic-mould and its depoling method Download PDFInfo
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- CN105598390B CN105598390B CN201610049505.6A CN201610049505A CN105598390B CN 105598390 B CN105598390 B CN 105598390B CN 201610049505 A CN201610049505 A CN 201610049505A CN 105598390 B CN105598390 B CN 105598390B
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- ceramic
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- depoling
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- blade
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Moulds, Cores, Or Mandrels (AREA)
Abstract
A kind of hollow blade ceramic-mould and its depoling method, ceramic-mould include shell and the paddle prototype being fixed in shell, ceramic slurry are irrigated in the inner chamber of shell；Some arbor rods are distributed in ceramic slurry, the device for pre-positioning for fixing arbor rod is provided with shell；Arbor rod is by anticorrosive core and is wrapped in the perishable coating of anticorrosive core outer layer and forms.The depoling method of the ceramic-mould includes preparing arbor rod successively, by arbor rod location and installation in shell interior, ceramic slurry is irrigated into the investment shell intracavity with paddle prototype, arbor rod is coated in ceramic slurry；The shell of outer layer is taken out after shaping, prepares the blade containing ceramic core；Depoling finally is carried out to the blade containing ceramic core, when the perishable coating on arbor rod surface, which has corroded, to be finished, anticorrosive core taken out, then blade is continued into depoling, until ceramic core removing finishes.Arbor rod of the present invention can increase core strength, accelerate reaction rate during depoling.
Description
Technical field
The invention belongs to hollow turbine vane to fabricate field, and in particular to a kind of hollow blade ceramic-mould and its de-
Core method.
Background technology
High-temperature alloy hollow blade ceramic core must have good chemical stability and high-temperature creep resistance, often
Two kinds of the main silica base of ceramic core and alumina base.The chemical stability of alumina based ceramic core is more preferable, makes
It is higher with temperature, 1850 DEG C are reached as high as, there is the coefficient of expansion to match with alumina-based ceramic shell, be more suitable for large scale
The production of directional vane.Aluminum oxide hardly possible reacts with soda acid depoling liquid, therefore the abjection of ceramic core is highly difficult, and it removes skill
Art is to restrict the big bottleneck that alumina based ceramic core uses.
At present, the influence factor for the depoling speed studied both at home and abroad mainly has porosity, the content of additive and distribution, mixed
Expect the aspect of technique three.And for porosity, porosity is bigger, and depoling performance is better, but porosity increase can directly result in
The reduction of core strength, intensity is too low to be broken in the pressure wax-pattern stage or in casting cycle under the impact of molten metal.Institute
It is not easy with porosity excessive, general control is between 35%~50%.
Goal of the invention
It is an object of the invention to for it is above-mentioned in the prior art the defects of, there is provided it is a kind of can proof strength requirement
Under the premise of, effectively improve the hollow blade ceramic-mould and its depoling method of depoling speed.
To achieve these goals, the technical scheme that hollow blade ceramic-mould of the present invention uses for：
Including shell and the paddle prototype being fixed in shell, ceramic slurry is perfused with the inner chamber of shell；Described
Distribution is provided with some arbor rods in ceramic slurry, and the arbor rod pre-determined bit for fixing arbor rod is provided with shell and is filled
Put；Described arbor rod is by anticorrosive core and is wrapped in the perishable coating of anticorrosive core outer layer and forms；Described is easy
After corrosion coating is corroded, space is produced between anticorrosive core and ceramic core, anticorrosive core can be along this space
Extract, through hole is formed in ceramic core, adds the contact area of ceramic core and depoling liquid.
Described anticorrosive core is made up of aluminum oxide or zirconium oxide.
Described perishable coating is made up of silica, magnesia or calcium oxide.
Described depoling liquid uses potassium hydroxide solution of the concentration for 30-70wt%.
Shell upper opening, arbor rod device for pre-positioning are the bridge plate being overlapped in opening, and being provided with arbor rod on bridge plate wears
Portal.
Described shell and paddle prototype is prepared by 3D printing.
The volume ratio that described arbor rod occupies in investment shell intracavity is 5%~10%.
The technical scheme that hollow blade ceramic-mould depoling method of the present invention uses, comprises the following steps：
1) arbor rod is prepared；
Anticorrosive core is made first, then deposits perishable coating in anticorrosive core surface；
2) arbor rod is interted；
Arbor rod device for pre-positioning is set on shell, by arbor rod location and installation in shell interior；
3) casting mold and blade are prepared；
Ceramic slurry is irrigated into the investment shell intracavity with paddle prototype so that arbor rod is coated in ceramic slurry；Into
After type, the shell of outer layer is removed, the blade casting mold containing ceramic core is prepared, after drying, sintering and casting of metals
Prepare the metal blade containing ceramic core；
4) blade depoling；
Depoling is carried out to the blade containing ceramic core using corrosive liquid, when the perishable coating on arbor rod surface has corroded
When finishing, anticorrosive core is taken out, then blade is continued into depoling, until ceramic core removing finishes.
The anticorrosive core diameters scope is 0.1mm~0.8mm, and length is 10mm~30mm；Described perishable plating
The thickness range of layer is 0.2mm~0.3mm；Deposition process uses chemical vapour deposition technique or sol-gel coating method.
Blade is put into high pressure depoling kettle and carries out depoling, the temperature of depoling liquid is 200-350 DEG C, and pressure is 5MPa- in kettle
25MPa, when the perishable coating on arbor rod surface, which has corroded, to be finished, anticorrosive core is taken out, then blade is put into high pressure
Depoling kettle continues depoling, by X-ray detection, until ceramic core removing finishes.
Compared with prior art, casting mold of the present invention considerably increases the through-hole rate of hollow turbine vane, accelerates hollow vortex
The depoling speed of impeller blade so that be more easy to remove inside ceramic-mould.The perishable coating of arbor rod not with anticorrosive core and
Paddle prototype is reacted, during depoling perishable coating can with depoling liquid fast reaction, it is anticorrosive after perishable coating is corroded
Space is produced between core and ceramic core, anticorrosive core can be extracted along this space, and then be internally formed in core penetrating
Vestibule, when the core containing through-hole carries out depoling processing, depoling liquid is penetrated into through-hole, such depoling liquid can with core
Increase contact area, improve the speed of reaction, accelerate reaction rate, one kind is provided newly to solve hollow turbine vane depoling
Method and approach.
Compared with prior art, depoling method of the present invention sets arbor rod, arbor rod outside deposition in ceramic slurry
High temperature resistant, perishable coating, during depoling, after the perishable coating outside arbor rod is corroded, anticorrosive core with
Space is produced between ceramic core, anticorrosive core can be extracted along this space, the contact surface of increase ceramic core and depoling liquid
Product, causes depoling liquid infiltration capacity to increase, accelerates the corrosion to core, so as to improve the depoling speed of hollow turbine vane.The party
Method can increase the corrosion rate of ceramic core, while the presence of arbor rod can reduce the deformation of creep amount of casting mold, in blade
In casting cycle, increase the intensity of ceramic core, prevent deformation, this method has obvious technology in speeding-up blade depoling speed
Advantage.
Further, for depoling method of the present invention when high pressure depoling kettle carries out depoling, the temperature of depoling liquid is 200-350
DEG C, pressure is 5MPa-25MPa in kettle, has corroded by the perishable coating on 4~5 hours arbor rod surfaces and has finished, will be anticorrosive
Core is taken out, then blade is put into high pressure depoling kettle and continues depoling, by about 20 hours, passes through X-ray detection, ceramic core
Removing finishes.As can be seen here, it is short using the depoling time of this method, depoling efficiency high.
Brief description of the drawings
Fig. 1 hollow turbine vane mold die overall schematics of the present invention (containing arbor rod)；
Half sectional view (containing arbor rod) inside Fig. 2 hollow turbine vane mold dies of the present invention；
Fig. 3 arbor rod decomposition texture schematic diagrams of the present invention；
Half sectional view after Fig. 4 hollow turbine vane ceramic core casting slurries of the present invention；
In accompanying drawing：1- shells；2- paddle prototypes；3- arbor rods；4- arbor rod device for pre-positioning；The perishable coating of 5-；6-
Anticorrosive core；7- ceramic slurries.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Referring to Fig. 1-4, hollow blade ceramic-mould of the invention includes shell 1 and the blade being fixed in shell 1 is former
Type 2, ceramic slurry 7 is perfused with the inner chamber of shell 1.Distribution is provided with some arbor rods 3 in ceramic slurry 7, shell 1 it is upper
Side's opening, arbor rod device for pre-positioning 4 are the bridge plate being overlapped in opening, and the punched out of arbor rod 3, arbor are offered on bridge plate
Rod 3 is suspended on arbor rod device for pre-positioning 4 and is bolted.Arbor rod 3 is by anticorrosive core 6 and is wrapped in anti-corruption
The perishable coating 5 of the erosion outer layer of core 6 forms, and anticorrosive core 6 is made up of aluminum oxide or zirconium oxide, and perishable coating 5 is by oxygen
SiClx, magnesia or calcium oxide are made, and depoling liquid uses potassium hydroxide solution of the concentration for 50wt%.Shell 1 and paddle prototype 2
Adopt and be made of resin, the volume ratio that arbor rod 3 occupies in the inner chamber of shell 1 is 5%~10%.
The depoling method of the present invention mainly includes the following steps that, carries out hollow turbine vane monoblock type resinogen pattern first
Has CAD design, using the paddle prototype 2 that 3D printing technique photocuring quickly prepares shell 1 and is fixed in shell 1；So
Arbor rod 3 is made afterwards, i.e., is easy to the coating of corrosion in the excellent core material surface manufacture of corrosion-resistant, mechanical behavior under high temperature, uses
In the firm and depoling of casting mold；Before core is poured into a mould, arbor rod 3 is inserted into the sky of shell 1 by arbor rod device for pre-positioning 4
Among chamber and it is fixed, stability of the possession ratio of arbor rod 3 control at 5%~10%, guarantee ceramic core casting；Its
It is secondary to prepare ceramic slurry 7, ceramic slurry 7 is filled into shell 1, solidifies ceramic slurry 7, is freezed in freeze-drier
Dry, successively cooled and solidified, distilled and the process such as parsing-desiccation；Using common roaster to monoblock type ceramic-mould base substrate
Colophony prototype is sintered, to leave " hole " cast hollow turbine vane casting.Through Ludox maceration extract intensive treatment ceramics
Casting mold；The operation such as finally it is sintered to ceramic-mould, obtains casting mold；Cast and high-temperature liquid metal and cool down into casting mold；Finally
Blade is put into high pressure depoling kettle and carries out depoling, the temperature of depoling liquid is 250 DEG C, and pressure was 7MPa in kettle, by 4~5 hours
When the perishable coating 5 on the surface of arbor rod 3, which has corroded, to be finished, anticorrosive core 6 is taken out, then blade is put into high pressure depoling
Kettle continues depoling, by about 20 hours, by X-ray detection, until ceramic core removing finishes.
The present invention can greatly increase the through-hole rate of hollow turbine vane, accelerate the depoling speed of hollow turbine vane, make
Ceramic core is more easy to remove.In this method, the outside coating material of arbor rod 3 is not anti-with core material, casting mold matrix material
Should.During depoling, the outside coating of arbor rod 3 can be with hot alkaline solution fast reaction, after corrosion of coating, the shape between ceramic rod and casting mold
Into gap, it is easy to take out arbor rod 3, and then penetrating vestibule is internally formed in core.Taken off in the core containing through-hole
During core processing, depoling liquid is penetrated into through-hole, such corrosive liquid can increase contact area with core, improve the speed of reaction
Degree.
Claims (5)
- A kind of 1. hollow blade ceramic-mould, it is characterised in that：Including shell (1) and it is fixed on the inner blade original of shell (1) Type (2), ceramic slurry (7) is perfused with the inner chamber of shell (1)；Distribution is provided with some cores in described ceramic slurry (7) Bone rod (3), the arbor rod device for pre-positioning (4) for fixing arbor rod (3) is provided with shell (1)；Described arbor rod (3) It is made up of anticorrosive core (6) and the perishable coating (5) for being wrapped in anticorrosive core (6) outer layer；Described perishable plating After layer (5) is corroded, anticorrosive core (6) produces space between ceramic core, and anticorrosive core (6) can be empty along this Gap is extracted, and through hole is formed in ceramic core, adds the contact area of ceramic core and depoling liquid；Described anticorrosive core (6) it is made up of aluminum oxide or zirconium oxide；Described perishable coating (5) is made up of silica, magnesia or calcium oxide；Described Depoling liquid uses potassium hydroxide solution of the concentration for 30-70wt%；Described shell (1) upper opening, arbor rod pre-determined bit dress It is the bridge plate being overlapped in opening to put (4), and arbor rod (3) punched out is provided with bridge plate.
- 2. hollow blade ceramic-mould according to claim 1, it is characterised in that：Described shell (1) and blade are former Type (2) is prepared by 3D printing.
- 3. hollow blade ceramic-mould according to claim 1, it is characterised in that：Described arbor rod (3) is in shell (1) The volume ratio occupied in inner chamber is 5%~10%.
- 4. a kind of hollow blade ceramic-mould depoling method, it is characterised in that comprise the following steps：1) arbor rod (3) is prepared；Anticorrosive core (6) is made first, then deposits perishable coating (5) on anticorrosive core (6) surface；2) arbor rod (3) is interted；Arbor rod device for pre-positioning (4), described shell (1) upper opening, arbor rod device for pre-positioning are set on shell (1) (4) it is the bridge plate being overlapped in opening, arbor rod (3) punched out is provided with bridge plate；By arbor rod (3) location and installation in shell (1) it is internal；3) casting mold and blade are prepared；Ceramic slurry (7) is irrigated into shell (1) inner chamber with paddle prototype (2) so that arbor rod (3) is coated on ceramic slurry Expect in (7)；After shaping, the shell (1) of outer layer is removed, prepares the blade casting mold containing ceramic core, by drying, sintering And the metal blade containing ceramic core is prepared after casting of metals；4) blade depoling；Depoling is carried out to the blade containing ceramic core using corrosive liquid, blade is put into high pressure depoling kettle carries out depoling, depoling The temperature of liquid is 200-350 DEG C, and pressure is 5MPa-25MPa in kettle, when the perishable coating (5) on arbor rod (3) surface has corroded When finishing, anticorrosive core (6) is taken out, then blade is put into high pressure depoling kettle and continues depoling, by X-ray detection, until Ceramic core removing finishes.
- 5. hollow blade ceramic-mould depoling method according to claim 4, it is characterised in that：The anticorrosive core (6) diameter range is 0.1mm~0.8mm, and length is 10mm~30mm；The thickness range of described perishable coating (5) is 0.2mm~0.3mm；Deposition process uses chemical vapour deposition technique or sol-gel coating method.
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| CN201610049505.6A CN105598390B (en) | 2016-01-25 | 2016-01-25 | A kind of hollow blade ceramic-mould and its depoling method |
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| CN201610049505.6A CN105598390B (en) | 2016-01-25 | 2016-01-25 | A kind of hollow blade ceramic-mould and its depoling method |
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| CN107152313B (en) * | 2017-06-13 | 2019-05-24 | 西安交通大学 | A kind of steam turbine last stage hollow blade and preparation method thereof based on 3d printing |
| CN108015224B (en) * | 2017-12-11 | 2020-01-10 | 中国航发南方工业有限公司 | Hollow blade wax mould pressing method |
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| CN112427625A (en) * | 2020-11-12 | 2021-03-02 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for removing ceramic core for blade with integral casting cover plate structure |
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| CN114433789B (en) * | 2022-01-27 | 2023-08-25 | 清华大学 | Ceramic core easy to take off core and preparation method thereof |
| CN114505450B (en) * | 2022-02-24 | 2023-04-18 | 安徽应流航源动力科技有限公司 | Composite ceramic rod for casting and molding top cover hole of hollow single crystal blade, manufacturing method and application |
| CN114804842B (en) * | 2022-05-11 | 2022-12-09 | 西安交通大学 | Preparation method of ceramic core with controllable pore distribution and atmosphere |
| CN115042299A (en) * | 2022-05-31 | 2022-09-13 | 安徽应流航源动力科技有限公司 | Preparation method of silicon-based ceramic core adopting quartz glass rod |
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