CN104550731B - The preparation technology that the anti-surface stray crystal of single crystal hollow turbo blade is formed with recrystallization - Google Patents
The preparation technology that the anti-surface stray crystal of single crystal hollow turbo blade is formed with recrystallization Download PDFInfo
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- CN104550731B CN104550731B CN201410742333.1A CN201410742333A CN104550731B CN 104550731 B CN104550731 B CN 104550731B CN 201410742333 A CN201410742333 A CN 201410742333A CN 104550731 B CN104550731 B CN 104550731B
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- 239000013078 crystal Substances 0.000 title claims abstract description 52
- 238000001953 recrystallisation Methods 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000005516 engineering process Methods 0.000 title claims abstract description 12
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 196
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 98
- 238000000034 method Methods 0.000 claims abstract description 39
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 16
- 239000000956 alloy Substances 0.000 claims abstract description 16
- 239000011257 shell material Substances 0.000 claims abstract description 10
- 238000009413 insulation Methods 0.000 claims abstract description 4
- 239000011819 refractory material Substances 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 50
- 238000009415 formwork Methods 0.000 claims description 41
- 239000004576 sand Substances 0.000 claims description 41
- 239000000843 powder Substances 0.000 claims description 33
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 31
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 30
- 238000005266 casting Methods 0.000 claims description 27
- 239000000919 ceramic Substances 0.000 claims description 27
- 239000000243 solution Substances 0.000 claims description 25
- 239000003513 alkali Substances 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000003780 insertion Methods 0.000 claims description 16
- 230000037431 insertion Effects 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 238000001746 injection moulding Methods 0.000 claims description 8
- 238000005498 polishing Methods 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 238000007711 solidification Methods 0.000 claims description 8
- 230000008023 solidification Effects 0.000 claims description 8
- 238000010025 steaming Methods 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 7
- 229910000601 superalloy Inorganic materials 0.000 claims description 7
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 5
- 238000005495 investment casting Methods 0.000 claims description 5
- 229910052845 zircon Inorganic materials 0.000 claims description 5
- 229910052726 zirconium Inorganic materials 0.000 claims description 5
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 5
- 229910001011 CMSX-4 Inorganic materials 0.000 claims description 4
- 239000006004 Quartz sand Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 235000013312 flour Nutrition 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000002791 soaking Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000002585 base Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052702 rhenium Inorganic materials 0.000 description 2
- -1 CMSX-10 Chemical compound 0.000 description 1
- 229910000995 CMSX-10 Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- DKAGJZJALZXOOV-UHFFFAOYSA-N hydrate;hydrochloride Chemical compound O.Cl DKAGJZJALZXOOV-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The present invention provides the preparation technology that a kind of anti-surface stray crystal of single crystal hollow turbo blade is formed with recrystallization, by positioning platinum filament exposed portion（Tail end）Ball adding shape wax part, brush thin cere in remaining exposed portion, in shell processed, the part is wrapped up by the refractory material as type shell material, end ball cavity and platinum filament side microvoid are formed after dewaxing, the cavity and side microvoid form insulation chambers during monocrystalline is prepared in vaccum sensitive stove, the heat bridge effect for exposing platinum filament part is avoided, so as to avoid the generation of alloy local overcooling, it is suppressed that the appearance of stray crystal；In addition, the cavity and platinum filament side microvoid provide Free up Memory for the deformation of platinum filament, it is to avoid the generation of local residual stress, and then avoid the generation of the recrystallization in blade postorder heat treatment process.
Description
Technical field
The present invention provides the preparation technology that a kind of anti-surface stray crystal of single crystal hollow turbo blade is formed with recrystallization, belongs to high
Temperature alloy technical field.
Background technology
Monocrystal nickel-base high-temperature alloy has excellent high-temperature behavior.At present, it has also become advanced aero engine and combustion gas wheel
The main material of machine blade.Due to the high intake air temperature requirement of aero-engine, blade material must also use gas cooling skill
Art could meet use demand.Therefore, hollow single crystal blade is applied widely in Modern Engine.
Hollow single crystal blade is typically prepared using casting method.Hollow parts are formed using ceramic core.In fusible pattern
In preparation process, although the displacement of core can be risen by the connected mode between reasonable selection core positioning end and shell certain
Restrictive function, but because ceramic core often has larger length and width ratio, and shell to the fixation dynamics of core still
It is substantially not enough, it is difficult to meet the rigors that model casting is limited ceramic core displacement.Core position is reduced or eliminated for maximum
Move, it is desirable to the key position of core is carried out being positioned at reinforcing with stud.Usually using metal platinum filament to core in actual production
Positioning.Due to monocrystal nickel-base high-temperature alloy composition complex, usually contain the element of more than ten, such as Ni, Al, Ti, Ta, W,
Contain 3wt%Re in Mo, Cr, Co, C, B, Re, Ru etc., such as second generation nickel-base high-temperature single crystal alloy, third generation nickel-based monocrystal high temperature is closed
Re containing 6wt% in gold, such as CMSX-10, Rene N6, TMS-75.The freezing range of single crystal alloy is wider, along with metal platinum
The tail end that silk stud exposes Blade roughcast surface can form heat conduction bridge in alloy graining and accelerate local heat conduction, cause to coagulate
Though during local easily supercooling cause to grow up to stray crystal in cast(ing) surface forming core；Also platinum filament stud exposes the tail of blade surface
End is fixed in formwork, can be because forming local residual stress and then causing blade shape in heat treatment in blade surface process of setting
Into defects such as recrystallizations.Therefore, how to use rational platinum filament technique for fixing and then avoid surface stray crystal and postorder heat treated
Recrystallization is the problem of must solving in actual production in journey.
The content of the invention
Goal of the invention：The present invention provides the preparation work that a kind of anti-surface stray crystal of single crystal hollow turbo blade is formed with recrystallization
Skill, its purpose is to avoid in blade process of setting recrystallization defect in the formation of surface stray crystal and postorder heat treatment process
Formation, meet demand of the high-performance enginer to single crystal turbine blade.
Technical scheme：The present invention is achieved by the following technical solutions：
The preparation technology that a kind of anti-surface stray crystal of single crystal hollow turbo blade is formed with recrystallization, it is characterised in that：The work
Skill is tail end ball adding shape wax part in positioning platinum filament exposed portion, and thin cere, the thin cere of the brush in shell processed are brushed in remaining exposed portion
Part is wrapped up by the refractory material as type shell material, and end ball cavity and platinum filament side microvoid are formed after dewaxing,
The cavity and side microvoid form insulation chambers during monocrystalline is prepared in vaccum sensitive stove, are specially：（a）, prepare contain
The blade wax mould of core；（b）, wax pattern surface insert platinum filament to core position；（c）, in platinum filament expose wax pattern surface part
Weld wax ball, the remaining thin cere of platinum filament surface brush in end；（d）, formwork prepared using precision casting process；（e）, draw
Single crystal blade；（f）, removing core, then remove stud.
The step of technique, is as follows：
（a）, prepare the blade wax mould containing core；Ceramic core is placed in Wax mold, formed in whose surfaces
Wax-pattern（2）, wax-pattern shaped using injection moulding mode, and injection temperature is 63 DEG C -68 DEG C, and pressure is 0.3-0.5MPa, during injection
Between be 10-30 second, the dwell time be 10-30 seconds；
（b）, wax pattern surface insert platinum filament to core position；Wax-pattern is taken, platinum filament is inserted perpendicular to wax pattern surface direction
In wax-pattern, the depth of insertion is equal with wax-pattern thickness, makes platinum filament insertion end and ceramic core（1）Complete comprehensive engagement；
（c）, platinum filament expose wax pattern surface part end weld wax ball；The end exposed in platinum filament uses drop legal system
Standby wax ball（5）；Platinum filament other expose one layer of thin cere of wax pattern surface lateral parts brush；
（d）, formwork prepared using precision casting process；Formwork is prepared using casting method, investment precoat uses powder
(320 mesh) and silicon sol solution, powder liquor ratio (3.0-3.5):1；Stucco first layer is 80 mesh sand, and the second layer is 60 mesh sand, the 3rd
Layer is 32 mesh sand, and four-layer 7 is 24 mesh sand, and last slurry seal layer uses investment precoat；Powder can use schmigel, zirconium English
Powder, silica flour or upper shop powder one kind therein, sanding material are emergy, zircon sand, quartz sand, upper shop sand etc. therein one
Kind；Then wax-pattern is removed, that is, dewaxed, removed using steaming process, vapor (steam) temperature is 150 DEG C -170 DEG C, 3-7 air of pressure
Pressure, the time is 10-60 minutes；
（e）, pulling monocrystal blade；Single crystal casting alloy can be using conventional single crystal super alloys such as N5, CMSX-4, DD6；It is fixed
It is 3mm/min-15mm/min to solidification drawing velocity;
（f）, removing core, then remove stud, the ceramic core after casting is finished is taken off using the NaOH or KOH aqueous solution
Remove.
（b）A diameter of 0.3-0.6mm of platinum filament in step, the length that platinum filament exposes wax pattern surface part is 3-10mm.
（c）The minimum distance h of the sphere of wax ball and wax pattern surface should be not less than 2mm in step, the exposed portion of platinum filament
End center and wax ball center deviation are not more than 1mm, a diameter of 1-3mm of wax ball；Platinum filament other expose wax pattern surface institute
Brush the thickness 0.1-0.3mm of thin cere.
（d）Formwork is put into roaster after formwork dewaxing in step and is calcined, sintering temperature is 850-980 DEG C, is protected
The warm time is 3-6 hours, and formwork is cleaned after stove is cold.
（f）Alkali mass concentration ratio is 25-40% in step, and temperature is 120 DEG C -280 DEG C, and pressure is 0.3-0.5MPa, removing
Time 2-50 hour.
（f）Remaining alkali lye is neutralized using aqueous hydrochloric acid solution on the rear blade of step progress, and concentration of hydrochloric acid solution is 1-
10%；The polishing of leaf surface residual platinum filament is removed.
Advantage and effect：The present invention provides the preparation that a kind of anti-surface stray crystal of single crystal hollow turbo blade is formed with recrystallization
Technique, by positioning platinum filament exposed portion（Tail end）Brush thin cere, the portion in shell processed in ball adding shape wax part, remaining exposed portion
Divide and wrapped up by the refractory material as type shell material, end ball cavity and platinum filament side microvoid are formed after dewaxing, should
Cavity and side microvoid form insulation chambers during monocrystalline is prepared in vaccum sensitive stove, it is to avoid exposes the heat of platinum filament part
Bridge effect, so as to avoid the generation of alloy local overcooling, it is suppressed that the appearance of stray crystal；In addition, the cavity and platinum filament side are micro-
Space provides Free up Memory for the deformation of platinum filament, it is to avoid the generation of local residual stress, and then avoids at blade postorder heat
Recrystallization during reason is produced.
Brief description of the drawings：
Fig. 1 is stud of the present invention and formwork structure schematic diagram, wherein 1, core；2nd, wax-pattern；3rd, formwork 4, platinum filament；5th, wax
Ball；
Fig. 2 is stud structural representation partial enlarged drawing, wherein, 1, core；2nd, wax-pattern；3rd, formwork；4th, platinum filament；5th, wax
Ball；6th, cere；
Fig. 3 is the present invention and the effect contrast figure of original method, wherein (a) is traditional handicraft single crystal casting（It is miscellaneous at stud
It is brilliant）, (b) is new technology monocrystalline（Without stray crystal at stud）.
Embodiment：The present invention is described further below in conjunction with the accompanying drawings：
The present invention relates to the preparation technology that a kind of anti-surface stray crystal of single crystal hollow turbo blade is formed with recrystallization, the technique
The step of it is as follows：
（a）, prepare the blade wax mould containing core；Ceramic core is placed in Wax mold, formed in whose surfaces
Wax-pattern（2）, wax-pattern shaped using injection moulding mode, and injection temperature is 63 DEG C -68 DEG C, and pressure is 0.3-0.5MPa, during injection
Between be 10-30 second, the dwell time be 10-30 seconds；
（b）, wax pattern surface insert platinum filament to core position；Wax-pattern is taken, platinum filament is inserted perpendicular to wax pattern surface direction
In wax-pattern, the depth of insertion is equal with wax-pattern thickness, makes platinum filament insertion end and ceramic core（1）Complete comprehensive engagement；Platinum filament it is straight
Footpath is 0.3-0.6mm, and the length that platinum filament exposes wax pattern surface part is 3-10mm;
（c）, platinum filament expose wax pattern surface part end weld wax ball；The end exposed in platinum filament uses drop legal system
Standby wax ball（5）, the sphere of wax ball and the minimum distance h of wax pattern surface should be not less than in 2mm, the end of the exposed portion of platinum filament
Heart position and wax ball center deviation are not more than 1mm, a diameter of 1-3mm of wax ball；Platinum filament other expose wax pattern surface lateral parts
One layer of thin cere of brush, thickness 0.1-0.3mm；
（d）, formwork prepared using precision casting process；Formwork is prepared using casting method, investment precoat uses powder
(320 mesh) and silicon sol solution, powder liquor ratio (3.0-3.5):1；Stucco first layer is 80 mesh sand, and the second layer is 60 mesh sand, the 3rd
Layer is 32 mesh sand, and four-layer 7 is 24 mesh sand, and last slurry seal layer uses investment precoat；Powder can use schmigel, zirconium English
Powder, silica flour or upper shop powder one kind therein, sanding material are emergy, zircon sand, quartz sand, upper shop sand etc. therein one
Kind；Then wax-pattern is removed, that is, dewaxed, removed using steaming process, vapor (steam) temperature is 150 DEG C -170 DEG C, 3-7 air of pressure
Pressure, the time is 10-60 minutes；Formwork is put into roaster after formwork dewaxing and is calcined, sintering temperature is 850-980 DEG C,
Soaking time is 3-6 hours, and formwork is cleaned after stove is cold；
（e）, pulling monocrystal blade；Single crystal casting alloy can be using conventional single crystal super alloys such as N5, CMSX-4, DD6；It is fixed
It is 3mm/min-15mm/min to solidification drawing velocity;
（f）, removing core, then remove stud, the ceramic core after casting is finished is taken off using the NaOH or KOH aqueous solution
Remove, alkali mass concentration ratio is 25-40%, temperature is 120 DEG C -280 DEG C, and pressure is 0.3-0.5MPa, removes time 2-50 hour；
Remaining alkali lye is neutralized using aqueous hydrochloric acid solution on blade, and concentration of hydrochloric acid solution is 1-10%；Leaf surface residual
Platinum filament polishing is removed.
Embodiment 1：
Ceramic core is placed in Wax mold, wax-pattern is shaped using injection moulding mode, injection temperature is 63 DEG C, pressure
Power is 0.5MPa, and injection time is 10 seconds, and the dwell time is 10 seconds；Wax-pattern is taken out, platinum filament is inserted perpendicular to wax pattern surface direction
Enter in wax-pattern, the depth of insertion is equal with wax-pattern thickness, platinum filament insertion end and the complete comprehensive engagement of ceramic core；Platinum filament it is a diameter of
0.3mm, the length that platinum filament exposes wax pattern surface part is 5mm;The end exposed in platinum filament prepares wax ball, wax ball using sessile drop method
Sphere and the minimum distance h of wax pattern surface should be not less than 2mm, the end center of the exposed portion of platinum filament with wax ball
Heart deviation is not more than 1mm, a diameter of 1mm of wax ball；Platinum filament other expose one layer of thin cere of wax pattern surface lateral parts brush, thickness
0.1mm；Formwork is prepared using casting method, coating uses powder (320 mesh) and silicon sol solution, powder liquor ratio 3:1；Stucco
One layer is 80 mesh sand, and the second layer is 60 mesh sand, and third layer is 32 mesh sand, and four-layer 7 is 24 mesh sand, and last slurry seal layer is used
Investment precoat；Powder uses schmigel, and sanding material is emergy；Wax-pattern is removed using steaming process, and vapor (steam) temperature is 150 DEG C,
3 atmospheric pressure of pressure, the time is 10 minutes；Formwork is put into roaster after formwork dewaxing and is calcined, sintering temperature is 850
DEG C, soaking time is 3 hours, and formwork is cleaned after stove is cold；Single crystal casting alloy can use N5 single crystal super alloys；Orientation
Solidification drawing velocity is 3mm/min;Ceramic core after casting is finished is removed using the KOH aqueous solution, and alkali concn is 25%（Matter
Amount ratio）, temperature is 120 DEG C, and pressure is 0.3MPa, removes 10 hours time；Remaining alkali lye is entered using aqueous hydrochloric acid solution on blade
Row is neutralized, and concentration of hydrochloric acid solution is 1%；The polishing of leaf surface residual platinum filament is removed.
Embodiment 2
Ceramic core is placed in Wax mold, wax-pattern is shaped using injection moulding mode, injection temperature is 65 DEG C, pressure
Power is 0.5MPa, and injection time is 30 seconds, and the dwell time is 30 seconds；Wax-pattern is taken out, platinum filament is inserted perpendicular to wax pattern surface direction
Enter in wax-pattern, the depth of insertion is equal with wax-pattern thickness, platinum filament insertion end and the complete comprehensive engagement of ceramic core；Platinum filament it is a diameter of
0.6mm, the length that platinum filament exposes wax pattern surface part is 8mm;The end exposed in platinum filament prepares wax ball, wax ball using sessile drop method
Sphere and the minimum distance h of wax pattern surface should be not less than 2mm, the end center of the exposed portion of platinum filament with wax ball
Heart deviation is not more than 1mm, a diameter of 3mm of wax ball；Platinum filament other expose one layer of thin cere of wax pattern surface lateral parts brush, thickness
0.3mm；Formwork is prepared using casting method, coating uses powder (320 mesh) and silicon sol solution, powder liquor ratio 3.5:1；Stucco
First layer is 80 mesh sand, and the second layer is 60 mesh sand, and third layer is 32 mesh sand, and four-layer 7 is 24 mesh sand, and last slurry seal layer is adopted
Use investment precoat；Powder uses zirconium English powder, and sanding material is zircon sand；Wax-pattern is removed using steaming process, and vapor (steam) temperature is 170
DEG C, 7 atmospheric pressure of pressure, the time is 60 minutes；Formwork is put into roaster after formwork dewaxing and is calcined, sintering temperature is
980 DEG C, soaking time is 6 hours, and formwork is cleaned after stove is cold；Single crystal casting alloy uses DD6 single crystal super alloys；It is fixed
It is 6mm/min to solidification drawing velocity;Ceramic core after casting is finished is removed using the NaOH aqueous solution, and alkali concn is 40%
（Mass ratio）, temperature is 180 DEG C, and pressure is 0.5MPa, removes 20 hours time；Remaining alkali lye uses aqueous hydrochloric acid solution on blade
Neutralized, concentration of hydrochloric acid solution is 2%；The polishing of leaf surface residual platinum filament is removed.
Embodiment 3
Ceramic core is placed in Wax mold, wax-pattern is shaped using injection moulding mode, injection temperature is 65 DEG C, pressure
Power is 0.3MPa, and injection time is 20 seconds, and the dwell time is 10 seconds；Wax-pattern is taken out, platinum filament is inserted perpendicular to wax pattern surface direction
Enter in wax-pattern, the depth of insertion is equal with wax-pattern thickness, platinum filament insertion end and the complete comprehensive engagement of ceramic core；Platinum filament it is a diameter of
0.4mm, the length that platinum filament exposes wax pattern surface part is 6mm;The end exposed in platinum filament prepares wax ball, wax ball using sessile drop method
Sphere and the minimum distance h of wax pattern surface should be not less than 2mm, the end center of the exposed portion of platinum filament with wax ball
Heart deviation is not more than 1mm, a diameter of 2mm of wax ball；Platinum filament other expose one layer of thin cere of wax pattern surface lateral parts brush, thickness
0.3mm；Formwork is prepared using casting method, coating uses powder (320 mesh) and silicon sol solution, powder liquor ratio 3:1；Stucco
One layer is 80 mesh sand, and the second layer is 60 mesh sand, and third layer is 32 mesh sand, and four-layer 7 is 24 mesh sand, and last slurry seal layer is used
Investment precoat；Powder uses upper shop powder, and sanding material is upper shop sand；Wax-pattern is removed using steaming process, and vapor (steam) temperature is 160 DEG C,
7 atmospheric pressure of pressure, the time is 12 minutes；Formwork is put into roaster after formwork dewaxing and is calcined, sintering temperature is 900
DEG C, soaking time is 4 hours, and formwork is cleaned after stove is cold；Single crystal casting alloy uses CMSX-4 single crystal super alloys；It is fixed
It is 7mm/min to solidification drawing velocity;Ceramic core after casting is finished is removed using the KOH aqueous solution, and alkali concn is 30%
（Mass ratio）, temperature is 280 DEG C, and pressure is 0.5MPa, removes 15 hours time；Remaining alkali lye uses aqueous hydrochloric acid solution on blade
Neutralized, concentration of hydrochloric acid solution is 5%；The polishing of leaf surface residual platinum filament is removed.
Embodiment 4：
Ceramic core is placed in Wax mold, wax-pattern is shaped using injection moulding mode, injection temperature is 68 DEG C, pressure
Power is 0.4MPa, and injection time is 15 seconds, and the dwell time is 20 seconds；Wax-pattern is taken out, platinum filament is inserted perpendicular to wax pattern surface direction
Enter in wax-pattern, the depth of insertion is equal with wax-pattern thickness, platinum filament insertion end and the complete comprehensive engagement of ceramic core；Platinum filament it is a diameter of
0.5mm, the length that platinum filament exposes wax pattern surface part is 10mm;The end exposed in platinum filament prepares wax ball, wax using sessile drop method
The sphere of ball and the minimum distance h of wax pattern surface should be not less than 2mm, end center and the wax ball of the exposed portion of platinum filament
Centre deviation is not more than 1mm, a diameter of 1mm of wax ball；Other expose one layer of thin cere of wax pattern surface lateral parts brush to platinum filament, thick
Spend 0.2mm；Formwork is prepared using casting method, coating uses powder (320 mesh) and silicon sol solution, powder liquor ratio 3. 3:1；
Stucco first layer is 80 mesh sand, and the second layer is 60 mesh sand, and third layer is 32 mesh sand, and four-layer 7 is 24 mesh sand, last slurry seal
Layer uses investment precoat；Powder uses schmigel, and sanding material is emergy；Wax-pattern is removed using steaming process, and vapor (steam) temperature is
155 DEG C, 5 atmospheric pressure of pressure, the time is 30 minutes；Formwork is put into roaster after formwork dewaxing and is calcined, roasting temperature
Spend for 880 DEG C, soaking time is 5 hours, and formwork is cleaned after stove is cold；Single crystal casting alloy can be closed using N5 monocrystalline high temperature
Gold；Directional solidification drawing velocity is 15mm/min;Ceramic core after casting is finished is removed using the KOH aqueous solution, alkali concn
For 35%（Mass ratio）, temperature is 150 DEG C, and pressure is 0.4MPa, removes time 2 h；Remaining alkali lye uses hydrochloric acid water on blade
Solution is neutralized, and concentration of hydrochloric acid solution is 10%；The polishing of leaf surface residual platinum filament is removed.
Embodiment 5：
Ceramic core is placed in Wax mold, wax-pattern is shaped using injection moulding mode, injection temperature is 63 DEG C, pressure
Power is 0.5MPa, and injection time is 30 seconds, and the dwell time is 30 seconds；Wax-pattern is taken out, platinum filament is inserted perpendicular to wax pattern surface direction
Enter in wax-pattern, the depth of insertion is equal with wax-pattern thickness, platinum filament insertion end and the complete comprehensive engagement of ceramic core；Platinum filament it is a diameter of
0.6mm, the length that platinum filament exposes wax pattern surface part is 3mm;The end exposed in platinum filament prepares wax ball, wax ball using sessile drop method
Sphere and the minimum distance h of wax pattern surface should be not less than 2mm, the end center of the exposed portion of platinum filament with wax ball
Heart deviation is not more than 1mm, a diameter of 3mm of wax ball；Platinum filament other expose one layer of thin cere of wax pattern surface lateral parts brush, thickness
0.2mm；Formwork is prepared using casting method, coating uses powder (320 mesh) and silicon sol solution, powder liquor ratio 3.5:1；Stucco
First layer is 80 mesh sand, and the second layer is 60 mesh sand, and third layer is 32 mesh sand, and four-layer 7 is 24 mesh sand, and last slurry seal layer is adopted
Use investment precoat；Powder uses zirconium English powder, and sanding material is zircon sand；Wax-pattern is removed using steaming process, and vapor (steam) temperature is 170
DEG C, 7 atmospheric pressure of pressure, the time is 30 minutes；Formwork is put into roaster after formwork dewaxing and is calcined, sintering temperature is
850 DEG C, soaking time is 6 hours, and formwork is cleaned after stove is cold；Single crystal casting alloy uses DD6 single crystal super alloys；It is fixed
It is 5mm/min to solidification drawing velocity;Ceramic core after casting is finished is removed using the NaOH aqueous solution, and alkali concn is 30%
（Mass ratio）, temperature is 200 DEG C, and pressure is 0.5MPa, removes 50 hours time；Remaining alkali lye uses aqueous hydrochloric acid solution on blade
Neutralized, concentration of hydrochloric acid solution is 8%；The polishing of leaf surface residual platinum filament is removed.
Claims (4)
1. the preparation technology that a kind of anti-surface stray crystal of single crystal hollow turbo blade is formed with recrystallization, it is characterised in that：The technique
It is tail end ball adding shape wax part in positioning platinum filament exposed portion, thin cere, the thin cere portion of the brush in shell processed are brushed in remaining exposed portion
Divide and wrapped up by the refractory material as type shell material, end ball cavity and platinum filament side microvoid are formed after dewaxing, should
Cavity and side microvoid form insulation chambers during monocrystalline is prepared in vaccum sensitive stove, are specially：（a）, prepare contain type
The blade wax mould of core；（b）, wax pattern surface insert platinum filament to core position；（c）, expose in platinum filament the end of wax pattern surface part
Weld wax ball, the remaining thin cere of platinum filament surface brush in portion；（d）, formwork prepared using precision casting process；（e）, draw it is single
Brilliant blade；（f）, removing core, then remove stud；
The step of technique, is as follows：
（a）, prepare the blade wax mould containing core；Ceramic core is placed in Wax mold, in whose surfaces formation wax-pattern
（2）, wax-pattern shaped using injection moulding mode, and injection temperature is 63 DEG C -68 DEG C, and pressure is 0.3-0.5MPa, and injection time is
10-30 seconds, the dwell time was 10-30 seconds；
（b）, wax pattern surface insert platinum filament to core position；Wax-pattern is taken, platinum filament is inserted into wax-pattern perpendicular to wax pattern surface direction
In, the depth of insertion is equal with wax-pattern thickness, makes platinum filament insertion end and ceramic core（1）Complete comprehensive engagement；
（c）, platinum filament expose wax pattern surface part end weld wax ball；The end exposed in platinum filament prepares wax using sessile drop method
Ball（5）；Platinum filament other expose one layer of thin cere of wax pattern surface lateral parts brush；
（d）, formwork prepared using precision casting process；Formwork is prepared using casting method, investment precoat uses 320 purposes
Powder and silicon sol solution, powder liquor ratio (3.0-3.5):1；Stucco first layer is 80 mesh sand, and the second layer is 60 mesh sand, and third layer is 32
Mesh sand, four-layer 7 is 24 mesh sand, and last slurry seal layer uses investment precoat；Powder uses schmigel, zirconium English powder, silica flour
Or upper shop powder one kind therein, sanding material is emergy, zircon sand, quartz sand or upper shop sand one kind therein；Then by wax
Mould is removed, that is, is dewaxed, removed using steaming process, and vapor (steam) temperature is 150 DEG C -170 DEG C, 3-7 atmospheric pressure of pressure, and the time is 10-
60 minutes；
（e）, pulling monocrystal blade；Single crystal casting alloy often uses single crystal super alloy using N5, CMSX-4 or DD6；Directional solidification
Drawing velocity is 3mm/min-15mm/min;
（f）, removing core, then remove stud, the ceramic core after casting is finished is removed using the NaOH or KOH aqueous solution；
（b）A diameter of 0.3-0.6mm of platinum filament in step, the length that platinum filament exposes wax pattern surface part is 3-10mm；
（c）The minimum distance h of the sphere of wax ball and wax pattern surface should be not less than 2mm, the end of the exposed portion of platinum filament in step
Center and wax ball center deviation are not more than 1mm, a diameter of 1-3mm of wax ball；Platinum filament other expose wax pattern surface and brush thin
The thickness 0.1-0.3mm of cere.
2. the preparation technology that the anti-surface stray crystal of single crystal hollow turbo blade according to claim 1 is formed with recrystallization, its
It is characterised by：（d）Formwork is put into roaster after formwork dewaxing in step and is calcined, sintering temperature is 850-980 DEG C, is protected
The warm time is 3-6 hours, and formwork is cleaned after stove is cold.
3. the preparation technology that the anti-surface stray crystal of single crystal hollow turbo blade according to claim 1 is formed with recrystallization, its
It is characterised by：（f）Alkali mass concentration ratio is 25-40% in step, and temperature is 120 DEG C -280 DEG C, and pressure is 0.3-0.5MPa, is taken off
Except time 2-50 hour.
4. the preparation technology that the anti-surface stray crystal of single crystal hollow turbo blade according to claim 1 is formed with recrystallization, its
It is characterised by：（f）Remaining alkali lye is neutralized using aqueous hydrochloric acid solution on the rear blade of step progress, and concentration of hydrochloric acid solution is 1-
10%；The polishing of leaf surface residual platinum filament is removed.
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| CN102873275B (en) * | 2012-09-28 | 2014-09-17 | 西安航空动力股份有限公司 | Fixing method of isometric crystal and columnar crystal ceramic mold core in mold shell |
| CN103056313A (en) * | 2013-01-05 | 2013-04-24 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for enhancing strength of single crystal blade core by metal core support |
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