CN104550731A - Preparation process for preventing surface impure crystal and recrystallization from formation of mono-crystal hollow turbine blade - Google Patents
Preparation process for preventing surface impure crystal and recrystallization from formation of mono-crystal hollow turbine blade Download PDFInfo
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Abstract
The invention provides a preparation process for preventing the formation of surface impure crystals and recrystallization on a mono-crystal hollow turbine blade. According to the preparation process, a spherical wax piece is arranged at an exposed part (tail end) of a positioning platinum wire; a thin wax film is brushed on the other exposed parts; the exposed part is covered with a fireproof material which is the same as a mold shell material in a shell making process; after de-waxing, an end part spherical cavity and a platinum wire face micro-gap are formed; a heat insulation cavity is formed by the cavity and the side micro-gap in a vacuum induction furnace in a mono-crystal preparation process; a heat bridge effect of the exposed platinum wire part is avoided so that an alloy is prevented from partial overcooling and the formation of impure crystal is inhibited; and furthermore, the cavity and the platinum wire side micro-gap provide a releasing space to the deformation of the platinum wire and the partial residual stress is prevented from occurring, and the recrystallization is prevented from occurring in a post heat treatment process of the blade.
Description
Technical field
The invention provides the preparation technology that the anti-surperficial stray crystal of a kind of single crystal hollow turbine blade and recrystallize are formed, belong to technical field of high temperature alloy.
Background technology
Monocrystal nickel-base high-temperature alloy has excellent high-temperature behavior.At present, the main raw of advanced aero engine and gas turbine blades has been become.Due to the high inlet air temperature requirement of aircraft engine, blade material also must adopt gas cooling technology to meet user demand.Therefore, hollow single crystal blade is applied widely in Modern Engine.
Hollow single crystal blade generally adopts casting method to prepare.Hollow parts adopts ceramic core to be formed.In fusible pattern preparation process, although certain restrictive function can be played to the displacement of core by the mode of connection between choose reasonable core positioning end and shell, but because ceramic core often has larger length and width ratio, and shell is still obviously not enough to the fixing dynamics of core, be difficult to meet the rigors that investment cast limits ceramic core displacement.Reduce or eliminate core displacement for maximum, the key position of requirement stud to core positions in reinforcing.Metal platinum filament is usually adopted to locate core in actual production.Due to monocrystal nickel-base high-temperature alloy composition complex, usually containing the element of more than ten, as Ni, Al, Ti, Ta, W, Mo, Cr, Co, C, B, Re, Ru etc., as contained 3wt%Re in s-generation nickel-base high-temperature single crystal alloy, containing the Re of 6wt% in third generation nickel-base high-temperature single crystal alloy, as CMSX-10, Rene N6, TMS-75 etc.The freezing range of single crystal alloy is wider, add the tail end that metal platinum filament stud exposes Blade roughcast surface can form heat conduction bridge when alloy graining and local heat conduction is accelerated, cause the easy mistake in local in process of setting cold and cause growing up to stray crystal at cast(ing) surface forming core; The tail end also having platinum filament stud to expose blade surface is fixed in formwork, can because forming local unrelieved stress and then causing blade to form the defects such as recrystallize when thermal treatment in blade surface process of setting.Therefore, how to adopt rational platinum filament technique for fixing and then avoid recrystallize in surperficial stray crystal and postorder heat treatment process to be the problem that must solve in actual production.
Summary of the invention
Goal of the invention: the invention provides the preparation technology that the anti-surperficial stray crystal of a kind of single crystal hollow turbine blade and recrystallize are formed, its objective is the formation of recrystallization defect in the formation of surperficial stray crystal in blade process of setting and postorder heat treatment process, meet the demand of high-performance enginer to single crystal turbine blade.
Technical scheme: the present invention is achieved by the following technical solutions:
The preparation technology that the anti-surperficial stray crystal of a kind of single crystal hollow turbine blade and recrystallize are formed, it is characterized in that: this technique adds spherical wax part in platinum filament exposed portion, location and tail end, thin cere is brushed in all the other exposed portion, when shell processed this brush thin cere part wrap up by the refractory materials the same with type shell material, end ball cavity and platinum filament side microvoid is formed after dewaxing, this cavity and side microvoid are prepared in monocrystalline process and are formed insulation chambers in vacuum induction furnace, are specially: (a), the blade wax mould of preparation containing core; (b), wax-pattern surface insert platinum filament core is located; (c), expose the welding edges wax ball of wax-pattern surface portion, the thin cere of remaining platinum filament surface brush at platinum filament; D (), employing precision casting process prepare formwork; (e), pulling monocrystal blade; (f), remove core, then remove stud.
The step of this technique is as follows:
(a), the blade wax mould of preparation containing core; Be placed on by ceramic core in Wax mold, form wax-pattern (2) in whose surfaces, wax-pattern adopts injection forming mode to be shaped, and injection temperature is 63 DEG C-68 DEG C, and pressure is 0.3-0.5MPa, and inject time is 10-30 second, and the dwell time is 10-30 second;
(b), wax-pattern surface insert platinum filament core is located; Get wax-pattern, insert in wax-pattern perpendicular to wax-pattern surface direction by platinum filament, the degree of depth of insertion is equal with wax-pattern thickness, and platinum filament insertion end is contacted with ceramic core (1) complete face;
(c), expose the welding edges wax ball of wax-pattern surface portion at platinum filament; Sessile drop method is adopted to prepare wax ball (5) in the end that platinum filament exposes; Platinum filament other expose the thin cere of wax-pattern surface sides part brush one deck;
D (), employing precision casting process prepare formwork; Adopt casting method to prepare formwork, investment precoat adopts powder (320 order) and silicon sol solution, powder liquor ratio (3.0-3.5): 1; Stucco the first layer is 80 order sand, and the second layer is 60 order sand, and third layer is 32 order sand, and four-layer 7 is 24 order sand, and last slurry seal layer adopts investment precoat; Powder can adopt lapis amiridis, zirconium English powder, silica powder or upper shop powder one wherein, and sanding material is the one wherein such as emergy, zircon sand, quartz sand, upper shop sand; Then removed by wax-pattern, namely dewax, adopt steaming process to remove, vapor temperature is 150 DEG C-170 DEG C, a pressure 3-7 normal atmosphere, and the time is 10-60 minute;
(e), pulling monocrystal blade; Single crystal casting alloy can adopt the conventional single crystal super alloy such as N5, CMSX-4, DD6; Directional freeze drawing velocity is 3mm/min-15mm/min;
(f), remove core, then remove stud, ceramic core after casting adopts the aqueous solution of NaOH or KOH to remove.
B in () step, the diameter of platinum filament is 0.3-0.6mm, the length that platinum filament exposes wax-pattern surface portion is 3-10mm.
C in () step, the sphere of wax ball and the closest range h on wax-pattern surface should be not less than 2mm, central position, end and the wax ball center deviation of the exposed portion of platinum filament are not more than 1mm, and the diameter of wax ball is 1-3mm; Platinum filament other expose wax-pattern surface brush the thickness 0.1-0.3mm of thin cere.
D formwork is put into stoving oven carry out roasting after formwork dewaxing in () step, maturing temperature is 850-980 DEG C, and soaking time is 3-6 hour, stove is cold to be cleaned afterwards to formwork.
F in () step, alkali mass concentration is than being 25-40%, temperature is 120 DEG C-280 DEG C, and pressure is 0.3-0.5MPa, removes time 2-50 hour.
On f rear blade that () step is carried out, remaining alkali lye adopts aqueous hydrochloric acid to neutralize, and concentration of hydrochloric acid solution is 1-10%; The polishing of leaf surface residual platinum filament is removed.
Advantage and effect: the invention provides the preparation technology that the anti-surperficial stray crystal of a kind of single crystal hollow turbine blade and recrystallize are formed, by adding spherical wax part in platinum filament exposed portion, location (tail end), thin cere is brushed in all the other exposed portion, when shell processed this part wrap up by the refractory materials the same with type shell material, end ball cavity and platinum filament side microvoid is formed after dewaxing, this cavity and side microvoid are prepared in monocrystalline process and are formed insulation chambers in vacuum induction furnace, avoid the heat bridge effect exposing platinum filament part, thus avoid the generation of alloy local overcooling, inhibit the appearance of stray crystal, in addition, this cavity and platinum filament side microvoid are that the distortion of platinum filament provides Free up Memory, avoid the generation of local unrelieved stress, and then the recrystallize avoided in blade postorder heat treatment process produces.
accompanying drawing illustrates:
Fig. 1 is stud of the present invention and formwork structure schematic diagram, wherein 1, core; 2, wax-pattern; 3, formwork 4, platinum filament; 5, wax ball;
Fig. 2 is stud structural representation partial enlarged drawing, wherein, and 1, core; 2, wax-pattern; 3, formwork; 4, platinum filament; 5, wax ball; 6, cere;
Fig. 3 is the effect contrast figure of the present invention and original method, and wherein (a) is traditional technology single crystal casting (stud place stray crystal), and (b) is novel process monocrystalline (stud place is without stray crystal).
embodiment:below in conjunction with accompanying drawing, the present invention is described further:
The present invention relates to the preparation technology that the anti-surperficial stray crystal of a kind of single crystal hollow turbine blade and recrystallize are formed, the step of this technique is as follows:
(a), the blade wax mould of preparation containing core; Be placed on by ceramic core in Wax mold, form wax-pattern (2) in whose surfaces, wax-pattern adopts injection forming mode to be shaped, and injection temperature is 63 DEG C-68 DEG C, and pressure is 0.3-0.5MPa, and inject time is 10-30 second, and the dwell time is 10-30 second;
(b), wax-pattern surface insert platinum filament core is located; Get wax-pattern, insert in wax-pattern perpendicular to wax-pattern surface direction by platinum filament, the degree of depth of insertion is equal with wax-pattern thickness, and platinum filament insertion end is contacted with ceramic core (1) complete face; The diameter of platinum filament is 0.3-0.6mm, and the length that platinum filament exposes wax-pattern surface portion is 3-10mm;
(c), expose the welding edges wax ball of wax-pattern surface portion at platinum filament; Adopt sessile drop method to prepare wax ball (5) in the end that platinum filament exposes, the sphere of wax ball and the closest range h on wax-pattern surface should be not less than 2mm, and central position, end and the wax ball center deviation of the exposed portion of platinum filament are not more than 1mm, and the diameter of wax ball is 1-3mm; Platinum filament other expose the thin cere of wax-pattern surface sides part brush one deck, thickness 0.1-0.3mm;
D (), employing precision casting process prepare formwork; Adopt casting method to prepare formwork, investment precoat adopts powder (320 order) and silicon sol solution, powder liquor ratio (3.0-3.5): 1; Stucco the first layer is 80 order sand, and the second layer is 60 order sand, and third layer is 32 order sand, and four-layer 7 is 24 order sand, and last slurry seal layer adopts investment precoat; Powder can adopt lapis amiridis, zirconium English powder, silica powder or upper shop powder one wherein, and sanding material is the one wherein such as emergy, zircon sand, quartz sand, upper shop sand; Then removed by wax-pattern, namely dewax, adopt steaming process to remove, vapor temperature is 150 DEG C-170 DEG C, a pressure 3-7 normal atmosphere, and the time is 10-60 minute; Formwork is put into stoving oven carry out roasting after formwork dewaxing, maturing temperature is 850-980 DEG C, and soaking time is 3-6 hour, and stove is cold to be cleaned afterwards to formwork;
(e), pulling monocrystal blade; Single crystal casting alloy can adopt the conventional single crystal super alloy such as N5, CMSX-4, DD6; Directional freeze drawing velocity is 3mm/min-15mm/min;
(f), remove core, then remove stud, ceramic core after casting adopts the aqueous solution of NaOH or KOH to remove, and alkali mass concentration is than being 25-40%, and temperature is 120 DEG C-280 DEG C, and pressure is 0.3-0.5MPa, removes time 2-50 hour;
On blade, remaining alkali lye adopts aqueous hydrochloric acid to neutralize, and concentration of hydrochloric acid solution is 1-10%; The polishing of leaf surface residual platinum filament is removed.
embodiment 1:
Be placed on by ceramic core in Wax mold, wax-pattern adopts injection forming mode to be shaped, and injection temperature is 63 DEG C, and pressure is 0.5MPa, and inject time is 10 seconds, and the dwell time is 10 seconds; Take out wax-pattern, insert in wax-pattern perpendicular to wax-pattern surface direction by platinum filament, the degree of depth of insertion is equal with wax-pattern thickness, and platinum filament insertion end contacts with ceramic core complete face; The diameter of platinum filament is 0.3mm, and the length that platinum filament exposes wax-pattern surface portion is 5mm; Adopt sessile drop method to prepare wax ball in the end that platinum filament exposes, the sphere of wax ball and the closest range h on wax-pattern surface should be not less than 2mm, and central position, end and the wax ball center deviation of the exposed portion of platinum filament are not more than 1mm, and the diameter of wax ball is 1mm; Platinum filament other expose the thin cere of wax-pattern surface sides part brush one deck, thickness 0.1mm; Adopt casting method to prepare formwork, coating adopts powder (320 order) and silicon sol solution, powder liquor ratio 3:1; Stucco the first layer is 80 order sand, and the second layer is 60 order sand, and third layer is 32 order sand, and four-layer 7 is 24 order sand, and last slurry seal layer adopts investment precoat; Powder adopts lapis amiridis, and sanding material is emergy; Wax-pattern adopts steaming process to remove, and vapor temperature is 150 DEG C, pressure 3 normal atmosphere, and the time is 10 minutes; Formwork is put into stoving oven carry out roasting after formwork dewaxing, maturing temperature is 850 DEG C, and soaking time is 3 hours, and stove is cold to be cleaned afterwards to formwork; Single crystal casting alloy can adopt N5 single crystal super alloy; Directional freeze drawing velocity is 3mm/min; Ceramic core after casting adopts the aqueous solution of KOH to remove, and alkali concn is 25%(mass ratio), temperature is 120 DEG C, and pressure is 0.3MPa, removes 10 hours time; On blade, remaining alkali lye adopts aqueous hydrochloric acid to neutralize, and concentration of hydrochloric acid solution is 1%; The polishing of leaf surface residual platinum filament is removed.
embodiment 2
Be placed on by ceramic core in Wax mold, wax-pattern adopts injection forming mode to be shaped, and injection temperature is 65 DEG C, and pressure is 0.5MPa, and inject time is 30 seconds, and the dwell time is 30 seconds; Take out wax-pattern, insert in wax-pattern perpendicular to wax-pattern surface direction by platinum filament, the degree of depth of insertion is equal with wax-pattern thickness, and platinum filament insertion end contacts with ceramic core complete face; The diameter of platinum filament is 0.6mm, and the length that platinum filament exposes wax-pattern surface portion is 8mm; Adopt sessile drop method to prepare wax ball in the end that platinum filament exposes, the sphere of wax ball and the closest range h on wax-pattern surface should be not less than 2mm, and central position, end and the wax ball center deviation of the exposed portion of platinum filament are not more than 1mm, and the diameter of wax ball is 3mm; Platinum filament other expose the thin cere of wax-pattern surface sides part brush one deck, thickness 0.3mm; Adopt casting method to prepare formwork, coating adopts powder (320 order) and silicon sol solution, powder liquor ratio 3.5:1; Stucco the first layer is 80 order sand, and the second layer is 60 order sand, and third layer is 32 order sand, and four-layer 7 is 24 order sand, and last slurry seal layer adopts investment precoat; Powder adopts zirconium English powder, and sanding material is zircon sand; Wax-pattern adopts steaming process to remove, and vapor temperature is 170 DEG C, pressure 7 normal atmosphere, and the time is 60 minutes; Formwork is put into stoving oven carry out roasting after formwork dewaxing, maturing temperature is 980 DEG C, and soaking time is 6 hours, and stove is cold to be cleaned afterwards to formwork; Single crystal casting alloy adopts DD6 single crystal super alloy; Directional freeze drawing velocity is 6mm/min; Ceramic core after casting adopts the aqueous solution of NaOH to remove, and alkali concn is 40%(mass ratio), temperature is 180 DEG C, and pressure is 0.5MPa, removes 20 hours time; On blade, remaining alkali lye adopts aqueous hydrochloric acid to neutralize, and concentration of hydrochloric acid solution is 2%; The polishing of leaf surface residual platinum filament is removed.
embodiment 3
Be placed on by ceramic core in Wax mold, wax-pattern adopts injection forming mode to be shaped, and injection temperature is 65 DEG C, and pressure is 0.3MPa, and inject time is 20 seconds, and the dwell time is 10 seconds; Take out wax-pattern, insert in wax-pattern perpendicular to wax-pattern surface direction by platinum filament, the degree of depth of insertion is equal with wax-pattern thickness, and platinum filament insertion end contacts with ceramic core complete face; The diameter of platinum filament is 0.4mm, and the length that platinum filament exposes wax-pattern surface portion is 6mm; Adopt sessile drop method to prepare wax ball in the end that platinum filament exposes, the sphere of wax ball and the closest range h on wax-pattern surface should be not less than 2mm, and central position, end and the wax ball center deviation of the exposed portion of platinum filament are not more than 1mm, and the diameter of wax ball is 2mm; Platinum filament other expose the thin cere of wax-pattern surface sides part brush one deck, thickness 0.3mm; Adopt casting method to prepare formwork, coating adopts powder (320 order) and silicon sol solution, powder liquor ratio 3:1; Stucco the first layer is 80 order sand, and the second layer is 60 order sand, and third layer is 32 order sand, and four-layer 7 is 24 order sand, and last slurry seal layer adopts investment precoat; Powder adopts upper shop powder, and sanding material is upper shop sand; Wax-pattern adopts steaming process to remove, and vapor temperature is 160 DEG C, pressure 7 normal atmosphere, and the time is 12 minutes; Formwork is put into stoving oven carry out roasting after formwork dewaxing, maturing temperature is 900 DEG C, and soaking time is 4 hours, and stove is cold to be cleaned afterwards to formwork; Single crystal casting alloy adopts CMSX-4 single crystal super alloy; Directional freeze drawing velocity is 7mm/min; Ceramic core after casting adopts the aqueous solution of KOH to remove, and alkali concn is 30%(mass ratio), temperature is 280 DEG C, and pressure is 0.5MPa, removes 15 hours time; On blade, remaining alkali lye adopts aqueous hydrochloric acid to neutralize, and concentration of hydrochloric acid solution is 5%; The polishing of leaf surface residual platinum filament is removed.
embodiment 4:
Be placed on by ceramic core in Wax mold, wax-pattern adopts injection forming mode to be shaped, and injection temperature is 68 DEG C, and pressure is 0.4MPa, and inject time is 15 seconds, and the dwell time is 20 seconds; Take out wax-pattern, insert in wax-pattern perpendicular to wax-pattern surface direction by platinum filament, the degree of depth of insertion is equal with wax-pattern thickness, and platinum filament insertion end contacts with ceramic core complete face; The diameter of platinum filament is 0.5mm, and the length that platinum filament exposes wax-pattern surface portion is 10mm; Adopt sessile drop method to prepare wax ball in the end that platinum filament exposes, the sphere of wax ball and the closest range h on wax-pattern surface should be not less than 2mm, and central position, end and the wax ball center deviation of the exposed portion of platinum filament are not more than 1mm, and the diameter of wax ball is 1mm; Platinum filament other expose the thin cere of wax-pattern surface sides part brush one deck, thickness 0.2mm; Adopt casting method to prepare formwork, coating adopts powder (320 order) and silicon sol solution, powder liquor ratio 3. 3:1; Stucco the first layer is 80 order sand, and the second layer is 60 order sand, and third layer is 32 order sand, and four-layer 7 is 24 order sand, and last slurry seal layer adopts investment precoat; Powder adopts lapis amiridis, and sanding material is emergy; Wax-pattern adopts steaming process to remove, and vapor temperature is 155 DEG C, pressure 5 normal atmosphere, and the time is 30 minutes; Formwork is put into stoving oven carry out roasting after formwork dewaxing, maturing temperature is 880 DEG C, and soaking time is 5 hours, and stove is cold to be cleaned afterwards to formwork; Single crystal casting alloy can adopt N5 single crystal super alloy; Directional freeze drawing velocity is 15mm/min; Ceramic core after casting adopts the aqueous solution of KOH to remove, and alkali concn is 35%(mass ratio), temperature is 150 DEG C, and pressure is 0.4MPa, removes time 2 h; On blade, remaining alkali lye adopts aqueous hydrochloric acid to neutralize, and concentration of hydrochloric acid solution is 10%; The polishing of leaf surface residual platinum filament is removed.
embodiment 5:
Be placed on by ceramic core in Wax mold, wax-pattern adopts injection forming mode to be shaped, and injection temperature is 63 DEG C, and pressure is 0.5MPa, and inject time is 30 seconds, and the dwell time is 30 seconds; Take out wax-pattern, insert in wax-pattern perpendicular to wax-pattern surface direction by platinum filament, the degree of depth of insertion is equal with wax-pattern thickness, and platinum filament insertion end contacts with ceramic core complete face; The diameter of platinum filament is 0.6mm, and the length that platinum filament exposes wax-pattern surface portion is 3mm; Adopt sessile drop method to prepare wax ball in the end that platinum filament exposes, the sphere of wax ball and the closest range h on wax-pattern surface should be not less than 2mm, and central position, end and the wax ball center deviation of the exposed portion of platinum filament are not more than 1mm, and the diameter of wax ball is 3mm; Platinum filament other expose the thin cere of wax-pattern surface sides part brush one deck, thickness 0.2mm; Adopt casting method to prepare formwork, coating adopts powder (320 order) and silicon sol solution, powder liquor ratio 3.5:1; Stucco the first layer is 80 order sand, and the second layer is 60 order sand, and third layer is 32 order sand, and four-layer 7 is 24 order sand, and last slurry seal layer adopts investment precoat; Powder adopts zirconium English powder, and sanding material is zircon sand; Wax-pattern adopts steaming process to remove, and vapor temperature is 170 DEG C, pressure 7 normal atmosphere, and the time is 30 minutes; Formwork is put into stoving oven carry out roasting after formwork dewaxing, maturing temperature is 850 DEG C, and soaking time is 6 hours, and stove is cold to be cleaned afterwards to formwork; Single crystal casting alloy adopts DD6 single crystal super alloy; Directional freeze drawing velocity is 5mm/min; Ceramic core after casting adopts the aqueous solution of NaOH to remove, and alkali concn is 30%(mass ratio), temperature is 200 DEG C, and pressure is 0.5MPa, removes 50 hours time; On blade, remaining alkali lye adopts aqueous hydrochloric acid to neutralize, and concentration of hydrochloric acid solution is 8%; The polishing of leaf surface residual platinum filament is removed.
Claims (7)
1. the preparation technology that formed of the anti-surperficial stray crystal of single crystal hollow turbine blade and recrystallize, it is characterized in that: this technique adds spherical wax part in platinum filament exposed portion, location and tail end, thin cere is brushed in all the other exposed portion, when shell processed this brush thin cere part wrap up by the refractory materials the same with type shell material, end ball cavity and platinum filament side microvoid is formed after dewaxing, this cavity and side microvoid are prepared in monocrystalline process and are formed insulation chambers in vacuum induction furnace, are specially: (a), the blade wax mould of preparation containing core; (b), wax-pattern surface insert platinum filament core is located; (c), expose the welding edges wax ball of wax-pattern surface portion, the thin cere of remaining platinum filament surface brush at platinum filament; D (), employing precision casting process prepare formwork; (e), pulling monocrystal blade; (f), remove core, then remove stud.
2. the preparation technology that formed of the anti-surperficial stray crystal of single crystal hollow turbine blade according to claim 1 and recrystallize, is characterized in that: the step of this technique is as follows:
(a), the blade wax mould of preparation containing core; Be placed on by ceramic core in Wax mold, form wax-pattern (2) in whose surfaces, wax-pattern adopts injection forming mode to be shaped, and injection temperature is 63 DEG C-68 DEG C, and pressure is 0.3-0.5MPa, and inject time is 10-30 second, and the dwell time is 10-30 second;
(b), wax-pattern surface insert platinum filament core is located; Get wax-pattern, insert in wax-pattern perpendicular to wax-pattern surface direction by platinum filament, the degree of depth of insertion is equal with wax-pattern thickness, and platinum filament insertion end is contacted with ceramic core (1) complete face;
(c), expose the welding edges wax ball of wax-pattern surface portion at platinum filament; Sessile drop method is adopted to prepare wax ball (5) in the end that platinum filament exposes; Platinum filament other expose the thin cere of wax-pattern surface sides part brush one deck;
D (), employing precision casting process prepare formwork; Adopt casting method to prepare formwork, investment precoat adopts powder (320 order) and silicon sol solution, powder liquor ratio (3.0-3.5): 1; Stucco the first layer is 80 order sand, and the second layer is 60 order sand, and third layer is 32 order sand, and four-layer 7 is 24 order sand, and last slurry seal layer adopts investment precoat; Powder can adopt lapis amiridis, zirconium English powder, silica powder or upper shop powder one wherein, and sanding material is the one wherein such as emergy, zircon sand, quartz sand, upper shop sand; Then removed by wax-pattern, namely dewax, adopt steaming process to remove, vapor temperature is 150 DEG C-170 DEG C, a pressure 3-7 normal atmosphere, and the time is 10-60 minute;
(e), pulling monocrystal blade; Single crystal casting alloy can adopt the conventional single crystal super alloy such as N5, CMSX-4, DD6; Directional freeze drawing velocity is 3mm/min-15mm/min;
(f), remove core, then remove stud, ceramic core after casting adopts the aqueous solution of NaOH or KOH to remove.
3. according to the preparation technology that the anti-surperficial stray crystal of single crystal hollow turbine blade and the recrystallize of claim 2 are formed, it is characterized in that: in (b) step, the diameter of platinum filament is 0.3-0.6mm, the length that platinum filament exposes wax-pattern surface portion is 3-10mm.
4. the preparation technology that the anti-surperficial stray crystal of single crystal hollow turbine blade stated according to claim 2 and recrystallize are formed, it is characterized in that: in (c) step, the sphere of wax ball and the closest range h on wax-pattern surface should be not less than 2mm, central position, end and the wax ball center deviation of the exposed portion of platinum filament are not more than 1mm, and the diameter of wax ball is 1-3mm; Platinum filament other expose wax-pattern surface brush the thickness 0.1-0.3mm of thin cere.
5. the preparation technology that the anti-surperficial stray crystal of single crystal hollow turbine blade stated according to claim 2 and recrystallize are formed, it is characterized in that: after formwork dewaxing, formwork is put into stoving oven in (d) step and carry out roasting, maturing temperature is 850-980 DEG C, soaking time is 3-6 hour, and stove is cold to be cleaned afterwards to formwork.
6. the preparation technology that the anti-surperficial stray crystal of single crystal hollow turbine blade stated according to claim 2 and recrystallize are formed, it is characterized in that: in (f) step, alkali mass concentration is than being 25-40%, temperature is 120 DEG C-280 DEG C, and pressure is 0.3-0.5MPa, removes time 2-50 hour.
7. the preparation technology that the anti-surperficial stray crystal of single crystal hollow turbine blade stated according to claim 2 and recrystallize are formed, is characterized in that: on the rear blade that (f) step is carried out, remaining alkali lye adopts aqueous hydrochloric acid to neutralize, and concentration of hydrochloric acid solution is 1-10%; The polishing of leaf surface residual platinum filament is removed.
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| CN110252958A (en) * | 2019-06-21 | 2019-09-20 | 西安交通大学 | It is a kind of based on listrium it is hollow/porous structure inhibit listrium stray crystal defect blade casting mold preparation method |
| CN111036847A (en) * | 2019-12-27 | 2020-04-21 | 安徽应流航源动力科技有限公司 | Method for preventing core deviation of directional blade of heavy gas turbine |
| CN111496187A (en) * | 2020-05-09 | 2020-08-07 | 中国航发北京航空材料研究院 | Precision investment casting method for single crystal duplex hollow guide blade |
| CN113458343A (en) * | 2021-07-05 | 2021-10-01 | 中国航发北京航空材料研究院 | Method for preventing inner cavity of single crystal hollow blade from recrystallizing |
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| CN114850397A (en) * | 2022-03-28 | 2022-08-05 | 安徽应流航源动力科技有限公司 | Method for preventing single crystal hollow guide blade from recrystallizing |
| CN116334422A (en) * | 2023-03-17 | 2023-06-27 | 西安航天发动机有限公司 | Forming method capable of realizing grain refinement of K4202 superalloy |
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| CN111036847A (en) * | 2019-12-27 | 2020-04-21 | 安徽应流航源动力科技有限公司 | Method for preventing core deviation of directional blade of heavy gas turbine |
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| CN113458343A (en) * | 2021-07-05 | 2021-10-01 | 中国航发北京航空材料研究院 | Method for preventing inner cavity of single crystal hollow blade from recrystallizing |
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| CN114309470A (en) * | 2021-12-31 | 2022-04-12 | 江苏永瀚特种合金技术股份有限公司 | Method for eliminating dendritic crystal broken arm defects at single crystal blade edge plate through temperature field regulation |
| CN114309470B (en) * | 2021-12-31 | 2023-11-03 | 江苏永瀚特种合金技术股份有限公司 | Method for eliminating dendrite arm defects at edge plate of single crystal blade through temperature field regulation and control |
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