CN103360079B - Method for customizing core and shell of integrated ceramic mold of hollow turbine blade - Google Patents
Method for customizing core and shell of integrated ceramic mold of hollow turbine blade Download PDFInfo
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Abstract
The invention discloses a method for customizing a core and a shell of an integrated ceramic mold of a hollow turbine blade. The method comprises the following steps of: preparing alumina-based ceramic slurry with different prescriptions; simultaneously casting the core and the shell of the hollow turbine blade by using different types of ceramic slurry under a vacuum environment; performing vacuum freeze drying and sintering to obtain the core and the shell of the ceramic mold with different components and different performances. In consideration of difference in stress states between the core and the shell and between different cores during pouring of molten metal, and difference in core stripping difficulty between the different cores, the ceramic mold can meet a requirement for pouring of the molten metal through the core and the shell with different components and different mechanical performances.
Description
Technical field
The invention belongs to Rapid Casting Technology field, relate to a kind of core shell method for customizing of hollow turbine vane integrated ceramic casting mold.
Background technology
Turbine blade is the key position of aircraft engine and internal combustion turbine.The raising of fuel gas temperature effectively can improve the output rating of internal combustion turbine and fuel saving.The temperature that can bear due to the refractory alloy preparing turbine blade reaches the limit, and the hollow turbine vane with complicated air cooling structure arises at the historic moment.The manufacture method of traditional hollow blade is investment cast, its technical process comprises core mold preparation, coremaking, Wax mold prepares, core and Wax mold are assembled, prepare wax-pattern, be coated with ceramic size, shell processed, change multiple processing steps such as wax, roasting, casting metal, depoling, and wherein ceramic core, Shell Preparation are basic.At present, the blade with high-efficient cooling structure becomes double wall from solid wall, and air film hole aperture is also constantly reducing, and internal cooling structure is more complicated, proposes challenge to conventional turbine vane manufacturing technology.Specifically, the deficiency of full form casting process is embodied in core and Wax mold anabolic process to exist in installation error, castingprocesses and easily produces the aspects such as core shift perforation defect, complex technical process are tediously long.
Integrated ceramic casting mold technology of preparing based on rapid shaping is that the manufacture difficult problem solving hollow turbine vane provides new approach.First this method adopts Introduction To Stereolithography to produce the colophony prototype of blade; Secondly, configuration ceramic size, utilizes gel injection molding and forming technology to be poured in colophony prototype by ceramic size; After ceramic size in-situ solidifying, utilize Vacuum Freezing & Drying Technology drying ceramic blank; Then, burn loss of gloss cured resin prototype and complete the sintering process of ceramic body; Finally, casting of molten metal, after cooling, carries out depoling process to foundry goods, the hollow turbine vane needed for acquisition.
This method is prepare hollow turbine vane to provide new approach, but has higher requirement to the over-all properties of ceramic-mould simultaneously.Along with extensively carrying out of the brilliant vane manufacturing of monocrystalline and orientation, also more and more higher to the mechanical property requirements of ceramic-mould.In the process of casting of molten metal, the stressing conditions between core and shell and different cores is different; In follow-up depoling process, different sites core remove complexity also difference to some extent.
Summary of the invention
The problem that the present invention solves is the core shell method for customizing providing a kind of hollow turbine vane integrated ceramic casting mold, by pouring into a mould different cores and shell with different ceramic size, with the intensity of the ventilation property and deformability and core that improve shell and non-deformability.
The present invention is achieved through the following technical solutions:
A core shell method for customizing for hollow turbine vane integrated ceramic casting mold, comprises the steps:
1) design based on photocurable quick shaping process and manufacture hollow turbine vane integration resin die, and at the different sites of shell and core, cast gate being set respectively;
2) based on Gel-casting process, for the shell that will pour into a mould or core, the ceramic size that solid load is different is prepared;
3) in prepared ceramic size, add catalyzer and initiator and stir, under vacuum conditions, corresponding ceramic size poured into a mould by the different cast gates to hollow turbine vane integration resin die simultaneously; After ceramic size in-situ solidifying, the integrated ceramic base substrate that formation core, shell composition are different;
4) integrated ceramic base substrate is put into reach in freezer, after crystal water fully charge in base substrate, it is moved to kiln from reach in freezer, remove the moisture in integrated ceramic base substrate by vacuum lyophilization;
5) after moisture is removed completely in integrated ceramic base substrate, integrated ceramic base substrate is sintered, obtain the hollow turbine vane integrated ceramic casting mold of core, type shell material differentiation.
Require that the different ceramic size of selection is according to the castability of shell, core:
Ensureing the ceramic size requiring to select cast shell under sintering strength and precise manner from raising ventilation property and deformability;
Ensureing the ceramic size selecting to pour into a mould core under sintering strength and precise manner from raising intensity and easy detachability.
The ceramic size of described cast shell is the ceramic size containing aluminum oxide, magnesium oxide, yttrium oxide and titanium oxide, and its solid load is less than 60%;
The ceramic size of cast core is the ceramic size containing aluminum oxide, magnesium oxide, nano silicon oxide, and its solid load is greater than 60%.
The ceramic size of described cast shell can ensure sintering strength and precision, can also improve porosity and meet shell to ventilation property and deformability requirement;
The ceramic size of described cast core can form strengthening phase mullite in sintering process, effectively can improve sintering strength; Under the prerequisite ensureing slurry fluidity, more improve its solid load, more can improve the density of ceramic post sintering thus improve sintering strength.
Being prepared as of described ceramic size:
1) by Gel-casting process requirement, by the acrylamide of certain mass ratio, N,N methylene bis acrylamide and sodium polyacrylate, after mixing, add deionized water, stirring and dissolving, be mixed with the premixed liquid that organism mass concentration is 10 ~ 20%;
2) by the requirement preparation solid powder of the ceramic size of cast shell, the ceramic size of cast core;
3) solid powder joined in premixed liquid respectively, fully stir, disperse, and regulate pH to be 9 ~ 11, obtain respectively pouring into a mould the ceramic size of shell, the ceramic size of cast core.
The solid powder of the ceramic size of described cast shell comprises the oxide compound of following component:
The aluminum oxide of 85 ~ 90 parts, the magnesium oxide of 1 ~ 5 part, the yttrium oxide of 5 ~ 10 parts, the titanium oxide of 0.2 ~ 1 part; Wherein aluminum oxide at least comprises two kinds of particles that particle diameter is 30 ~ 40 μm and 2 ~ 5 μm; The size of magnesium oxide, titanium oxide is 30 ~ 40 μm; The size of yttrium oxide is 2 ~ 5 μm;
The solid powder of the ceramic size of cast core comprises the oxide compound of following component:
The aluminum oxide of 80 ~ 90 parts, the magnesium oxide of 2 ~ 5 parts, the silicon oxide of 0.2 ~ 0.5 part; Wherein aluminum oxide at least comprises two kinds of particles that particle diameter is 30 ~ 40 μm and 2 ~ 5 μm; Magnesian size is 30 ~ 40 μm, and silicon oxide size is 20 ~ 30nm.
Described hollow turbine vane integration resin die is provided with multiple cast gate, pours into a mould a kind of ceramic size with shaping a certain casting mold position by a cast gate.
During the described slurry of cast ceramics under vacuum conditions, vacuum tightness is set as the threshold value that ceramic size does not seethe with excitement.
Described ceramic size is poured into a mould to hollow turbine vane integration resin die by vacuum casting machine, and provides applied vibration to promote the discharge of bubble in ceramic size in casting process by vacuum casting machine.
Temperature when described integrated ceramic base sinters is 1250 ~ 1350 DEG C.
Compared with prior art, the present invention has following useful technique effect:
The core shell method for customizing of hollow turbine vane integrated ceramic casting mold provided by the invention, meeting under the prerequisite in refractoriness, intensity, non-deformability etc., by pouring into a mould different ceramic size to the different cast gate of resin die, achieve the customization of the integrated ceramic casting mold of materials variances between core and shell and different core.And the difference of core and shell green ceramic material composition will inevitably cause the difference of Low fire ceramic casting mold mechanical property, the core with mechanical property difference prepared and shell, thus the requirement meeting the core of casting mold and the different of shell.The difference of strained condition between core and shell and different core when considering casting of molten metal, and the difference of different core depoling complexity, core and the shell with heterogeneity and mechanical property can make ceramic-mould more can meet pouring metal melt requirement.
Further, the present invention is by preparing core and the shell of casting mold with different ceramic size cast, shell can be made to have certain ventilation property, and (core deformability is little relative to shell with deformability, to ensure the precision of internal cooling channel after blade castable), and make core have higher intensity, non-deformability and more easily remove, the over-all properties of hollow turbine vane core shell integrated ceramic casting mold will increase, thus meets monocrystalline and the requirement of orientation brilliant blade casting technique.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of photocuring paddle prototype;
Fig. 2 is the schematic diagram of the resin die cad model with cast gate;
Fig. 3 is type shell material microstructure.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, and the explanation of the invention is not limited.
The core shell method for customizing of hollow turbine vane integrated ceramic casting mold provided by the invention, comprises the steps:
1) design based on photocurable quick shaping process and manufacture hollow turbine vane integration resin die, and at the different sites of shell and core, cast gate being set respectively;
2) based on Gel-casting process, for the shell that will pour into a mould or core, the ceramic size that solid load is different is prepared;
3) in prepared ceramic size, add catalyzer and initiator and stir, under vacuum conditions, corresponding ceramic size poured into a mould by the different cast gates to hollow turbine vane integration resin die simultaneously; After ceramic size in-situ solidifying, the integrated ceramic base substrate that formation core, shell composition are different;
4) integrated ceramic base substrate is put into reach in freezer, after crystal water fully charge in base substrate, it is moved to kiln from reach in freezer, remove the moisture in integrated ceramic base substrate by vacuum lyophilization;
5) after moisture is removed completely in integrated ceramic base substrate, integrated ceramic base substrate is sintered, obtain the hollow turbine vane integrated ceramic casting mold of core, type shell material differentiation.
Further, require that the different ceramic size of selection is according to the castability of shell, core:
Ensureing the ceramic size requiring to select cast shell under sintering strength and precise manner from raising ventilation property and deformability;
Ensureing the ceramic size selecting to pour into a mould core under sintering strength and precise manner from raising intensity and easy detachability.
Concrete, the ceramic size of cast shell is the ceramic size containing aluminum oxide, magnesium oxide, yttrium oxide and titanium oxide, and its solid load is less than 60%; The ceramic size of described cast shell can ensure sintering strength and precision, can also improve porosity and meet shell to ventilation property and deformability requirement;
The ceramic size of cast core is the ceramic size containing aluminum oxide, magnesium oxide, nano silicon oxide, and its solid load is greater than 60%.The ceramic size of described cast core can form strengthening phase mullite in sintering process, effectively can improve sintering strength; Under the prerequisite ensureing slurry fluidity, more improve its solid load, more can improve the density of ceramic post sintering thus improve sintering strength.
And the solid powder pouring into a mould the ceramic size of shell comprises the oxide compound of following component:
The aluminum oxide of 85 ~ 90 parts, the magnesium oxide of 1 ~ 5 part, the yttrium oxide of 5 ~ 10 parts, the titanium oxide of 0.2 ~ 1 part; Wherein aluminum oxide at least comprises two kinds of particles that particle diameter is 30 ~ 40 μm and 2 ~ 5 μm; The size of magnesium oxide, titanium oxide is 30 ~ 40 μm; The size of yttrium oxide is 2 ~ 5 μm;
The solid powder of the ceramic size of cast core comprises the oxide compound of following component:
The aluminum oxide of 80 ~ 90 parts, the magnesium oxide of 2 ~ 5 parts, the silicon oxide of 0.2 ~ 0.5 part; Wherein aluminum oxide at least comprises two kinds of particles that particle diameter is 30 ~ 40 μm and 2 ~ 5 μm; Magnesian size is 30 ~ 40 μm, and silicon oxide size is 20 ~ 30nm.
According to the castability requirement of ascending-type core pattern shell, below embodiment pour into a mould core and shell respectively with four kinds of ceramic sizes of heterogeneity or different solid load, be intended to hollow turbine vane integrated ceramic casting mold core shell method for customizing is described.Core and shell that two, three or more plant ceramic size cast integrated ceramic casting mold can be adopted in embody rule.
Alumina-based ceramic containing sintering aid magnesium oxide, yttrium oxide and titanium oxide, control its solid load and be less than 60%, can ensure sintering strength and precision on the one hand, can realize high porosity to meet ventilation property and deformability requirement on the other hand, be ideal type shell material.
Alumina ceramic powder containing nano silicon oxide can form strengthening phase mullite in sintering process, effectively can improve sintering strength; Under the prerequisite ensureing slurry fluidity, improve solid load (controlling more than 60%) as far as possible, can improve the density of ceramic post sintering thus improve sintering strength, the pottery of this composition and solid load is ideal core material.
Embodiment 1
The core shell method for customizing of hollow turbine vane integrated ceramic casting mold, comprises the steps:
1) make hollow turbine vane resin die by light-curing rapid forming equipment, molding resin is 8981 resins.This resin die is designed with 4 cast gates, and wherein 1 in order to pour into a mould shell, 3 in order to pour into a mould core, the cad model of photocuring paddle prototype (simplification) and resin die is as shown in Figure 1 and Figure 2.
2) based on Gel-casting process, ceramic size is made:
First by organic monomer AM(acrylamide) and linking agent MBAM(N, N '-methylene-bisacrylamide) be dissolved in deionized water according to mass ratio 24:1, add appropriate dispersion agent (dispersion agent add-on is 2% of powder quality) again, stirring and dissolving, is mixed with the premixed liquid that organic concentration is 15%.
2) take powder 1 and powder 2 by a certain percentage, and powder is uniformly mixed in a reservoir;
In mass fraction, wherein, powder 1 comprises particle diameter 40 μm of aluminum oxide of 59.5 parts, particle diameter 2 μm of aluminum oxide of 30 parts, particle diameter 40 μm of magnesium oxide of 2 parts, 8 parts of particle diameters, 3 μm of yttrium oxide, particle diameter 40 μm of titanium oxide of 0.5 part;
Powder 2 comprises particle diameter 40 μm of aluminum oxide of 64 parts, particle diameter 2 μm of aluminum oxide of 31.5 parts, particle diameter 40 μm of magnesium oxide of 4 parts, the particle diameter 20nm silicon oxide of 0.5 part;
3) premixed liquid is poured in ball grinder, by powder 1 and powder 2 respectively in batches add in premixed liquid, stir, add proper ammonia and regulate PH to 9 ~ 11, make the ceramic size of the ceramic size of cast shell, cast core respectively.Wherein prepare with powder 1 the cast shell ceramic size that solid load is 58%, prepare with powder 2 ceramic size that solid load is the cast core of 60%, 62% and 64% solid load, and number consecutively is slurry 1, slurry 2, slurry 3 and slurry 4.In slurry 2,3,4, add several red, blue, black inks successively, be convenient to the different ceramic size of later observation and pour into a mould at the same time and the degree of mixing in solidification process.
Add corundum abrading-ball according to pellet mass ratio 1:2.5, be 360r/min by planetary ball mill speed adjustment, ball milling 60min, disperses, and obtains the ceramic size of good fluidity.
4) in four kinds of ceramic sizes, successively catalyzer TEMED(Tetramethyl Ethylene Diamine is added) and initiator A PS(ammonium persulfate solution), after stirring at type vacuum injecting and forming machine upper in resin die, pour into a mould different cores and shell by four cast gates of resin die with four kinds of different slurries simultaneously.In 5 ~ 15min, ceramic size in-situ solidifying, forms ceramic body.
5) after slurry fully solidifies, ceramic body is put into the reach in freezer of-60 DEG C; After crystal water fully charge in base substrate, base substrate is put into kiln, remove the moisture in base substrate by vacuum freeze-drying technique.
6) after base substrate complete drying, remove surface resin shell, cut the base substrate of one of them, observe core shell color, the structural transition junction only having different ceramic size to pour into a mould has local color to mix, and illustrates that different slurry is without obvious mixing in cast and solidification process.Other base substrates are put into high temperature sintering furnace sinter, sintering temperature is 1250 DEG C.After having sintered, obtain the integrated ceramic casting mold of core type shell material differentiation.
Observed by CT scan, differing materials transition junction flawless.By scanning electron microscopic observation (Fig. 2, wherein relatively large shape thing is mainly Large stone alumina powder, fine particle is mainly the alumina powder of small particle size), result shows to there is a large amount of hole (actual measurement porosity is more than 40%) in the shell stupalith after burning till, meet the gas permeability requirements of casting of molten metal, high porosity also contributes to the deformability improving stupalith.
Embodiment 2
The core shell method for customizing of hollow turbine vane integrated ceramic casting mold, comprises the steps:
1) make hollow turbine vane resin die by light-curing rapid forming equipment, molding resin is 8981 resins.This resin die is designed with 4 cast gates, and wherein 1 in order to pour into a mould shell, and 3 in order to pour into a mould core.
2) based on Gel-casting process, ceramic size is made:
First by organic monomer AM(acrylamide) and linking agent MBAM(N, N '-methylene-bisacrylamide) be dissolved in deionized water according to mass ratio 24:1, add appropriate dispersion agent (dispersion agent add-on is 2% of powder quality) again, stirring and dissolving, is mixed with the premixed liquid that organic concentration is 20%.
2) take powder 1 and powder 2 by a certain percentage, and powder is uniformly mixed in a reservoir;
In mass fraction, wherein, powder 1 comprises particle diameter 40 μm of aluminum oxide of 59 parts, particle diameter 2 μm of aluminum oxide of 30 parts, particle diameter 40 μm of magnesium oxide of 4 parts, 6 parts of particle diameters, 3 μm of yttrium oxide, particle diameter 40 μm of titanium oxide of 1 part;
Powder 2 comprises particle diameter 40 μm of aluminum oxide of 63.5 parts, particle diameter 2 μm of aluminum oxide of 31 parts, particle diameter 40 μm of magnesium oxide of 5 parts, the particle diameter 20nm silicon oxide of 0.5 part;
3) premixed liquid is poured in ball grinder, by powder 1 and powder 2 respectively in batches add in premixed liquid, stir, add proper ammonia and regulate PH to 9 ~ 11, make the ceramic size of the ceramic size of cast shell, cast core respectively.Wherein prepare with powder 1 the cast shell ceramic size that solid load is 58.5%, prepare with powder 2 ceramic size that solid load is the cast core of 60%, 63% and 65% solid load, and number consecutively is slurry 1, slurry 2, slurry 3 and slurry 4.In slurry 2,3,4, add several red, blue, black inks successively, be convenient to the different ceramic size of later observation and pour into a mould at the same time and the degree of mixing in solidification process.
Add corundum abrading-ball according to pellet mass ratio 1:2.5, be 360r/min by planetary ball mill speed adjustment, ball milling 60min, disperses, and obtains the ceramic size of good fluidity.
4) in four kinds of ceramic sizes, successively catalyzer TEMED(Tetramethyl Ethylene Diamine is added) and initiator A PS(ammonium persulfate solution), after stirring at type vacuum injecting and forming machine upper in resin die, pour into a mould different cores and shell by four cast gates of resin die with four kinds of different slurries simultaneously.In 5 ~ 15min, ceramic size in-situ solidifying, forms ceramic body.
5) after slurry fully solidifies, ceramic body is put into the reach in freezer of-60 DEG C; After crystal water fully charge in base substrate, base substrate is put into kiln, remove the moisture in base substrate by vacuum freeze-drying technique.
6) after base substrate complete drying, remove surface resin shell, cut the base substrate of one of them, observe core shell color, the structural transition junction only having different ceramic size to pour into a mould has local color to mix, and illustrates that different slurry is without obvious mixing in cast and solidification process.Other base substrates are put into high temperature sintering furnace sinter, sintering temperature is 1350 DEG C.After having sintered, obtain the integrated ceramic casting mold of core type shell material differentiation.
Embodiment 3
The core shell method for customizing of hollow turbine vane integrated ceramic casting mold, comprises the steps:
1) make hollow turbine vane resin die by light-curing rapid forming equipment, molding resin is 8981 resins.This resin die is designed with 2 cast gates, and wherein 1 in order to pour into a mould shell, and 1 in order to pour into a mould core.
2) based on Gel-casting process, ceramic size is made:
First by organic monomer AM(acrylamide) and linking agent MBAM(N, N '-methylene-bisacrylamide) be dissolved in deionized water according to mass ratio 24:1, add appropriate dispersion agent (dispersion agent add-on is 2% of powder quality) again, stirring and dissolving, is mixed with the premixed liquid that organic concentration is 20%.
2) take powder 1 and powder 2 by a certain percentage, and powder is uniformly mixed in a reservoir;
In mass fraction, wherein, powder 1 comprises particle diameter 40 μm of aluminum oxide of 59.5 parts, particle diameter 2 μm of aluminum oxide of 30 parts, particle diameter 40 μm of magnesium oxide of 2 parts, 8 parts of particle diameters, 3 μm of yttrium oxide, particle diameter 40 μm of titanium oxide of 0.5 part;
Powder 2 comprises particle diameter 40 μm of aluminum oxide of 64 parts, particle diameter 2 μm of aluminum oxide of 31.5 parts, particle diameter 40 μm of magnesium oxide of 4 parts, the particle diameter 20nm silicon oxide of 0.5 part;
3) premixed liquid is poured in ball grinder, by powder 1 and powder 2 respectively in batches add in premixed liquid, stir, add proper ammonia and regulate PH to 9 ~ 11, make the ceramic size of the ceramic size of cast shell, cast core respectively.Wherein prepare with powder 1 the cast shell ceramic size that solid load is 56.5%, prepare with powder 2 ceramic size that solid load is the cast core of 64% solid load, and number consecutively is slurry 1, slurry 2, slurry 3 and slurry 4.In slurry 2,3,4, add several red, blue, black inks successively, be convenient to the different ceramic size of later observation and pour into a mould at the same time and the degree of mixing in solidification process.
Add corundum abrading-ball according to pellet mass ratio 1:2.5, be 360r/min by planetary ball mill speed adjustment, ball milling 60min, disperses, and obtains the ceramic size of good fluidity.
4) in four kinds of ceramic sizes, successively catalyzer TEMED(Tetramethyl Ethylene Diamine is added) and initiator A PS(ammonium persulfate solution), after stirring at type vacuum injecting and forming machine upper in resin die, pour into a mould different cores and shell by four cast gates of resin die with four kinds of different slurries simultaneously.In 5 ~ 15min, ceramic size in-situ solidifying, forms ceramic body.
5) after slurry fully solidifies, ceramic body is put into the reach in freezer of-60 DEG C; After crystal water fully charge in base substrate, base substrate is put into kiln, remove the moisture in base substrate by vacuum freeze-drying technique.
6) after base substrate complete drying, remove surface resin shell, cut the base substrate of one of them, observe core shell color, the structural transition junction only having different ceramic size to pour into a mould has local color to mix, and illustrates that different slurry is without obvious mixing in cast and solidification process.Other base substrates are put into high temperature sintering furnace sinter, sintering temperature is 1250 DEG C.After having sintered, obtain the integrated ceramic casting mold of core type shell material differentiation.
Claims (7)
1. a core shell method for customizing for hollow turbine vane integrated ceramic casting mold, is characterized in that, comprise the steps:
1) design based on photocurable quick shaping process and manufacture hollow turbine vane integration resin die, and at the different sites of shell and core, cast gate being set respectively;
2) based on Gel-casting process, for the shell that will pour into a mould or core, the ceramic size that solid load is different is prepared;
3) in prepared ceramic size, add catalyzer and initiator and stir, under vacuum conditions, corresponding ceramic size poured into a mould by the different cast gates to hollow turbine vane integration resin die simultaneously; After ceramic size in-situ solidifying, the integrated ceramic base substrate that formation core, shell composition are different;
4) integrated ceramic base substrate is put into reach in freezer, after crystal water fully charge in base substrate, it is moved to kiln from reach in freezer, remove the moisture in integrated ceramic base substrate by vacuum lyophilization;
5) after moisture is removed completely in integrated ceramic base substrate, integrated ceramic base substrate is sintered, obtain the hollow turbine vane integrated ceramic casting mold of core, type shell material differentiation;
The ceramic size of cast shell is the ceramic size containing aluminum oxide, magnesium oxide, yttrium oxide and titanium oxide, and its solid load is less than 60%;
The ceramic size of cast core is the ceramic size containing aluminum oxide, magnesium oxide, nano silicon oxide, and its solid load is greater than 60%;
The solid powder of the ceramic size of cast shell comprises the oxide compound of following component:
The aluminum oxide of 85 ~ 90 parts, the magnesium oxide of 1 ~ 5 part, the yttrium oxide of 5 ~ 10 parts, the titanium oxide of 0.2 ~ 1 part; Wherein aluminum oxide at least comprises two kinds of particles that particle diameter is 30 ~ 40 μm and 2 ~ 5 μm; The size of magnesium oxide, titanium oxide is 30 ~ 40 μm; The size of yttrium oxide is 2 ~ 5 μm;
The solid powder of the ceramic size of cast core comprises the oxide compound of following component:
The aluminum oxide of 80 ~ 90 parts, the magnesium oxide of 2 ~ 5 parts, the silicon oxide of 0.2 ~ 0.5 part; Wherein aluminum oxide at least comprises two kinds of particles that particle diameter is 30 ~ 40 μm and 2 ~ 5 μm; Magnesian size is 30 ~ 40 μm, and silicon oxide size is 20 ~ 30nm;
Under vacuum conditions during cast ceramics slurry, vacuum tightness is set as the threshold value that ceramic size does not seethe with excitement.
2. the core shell method for customizing of hollow turbine vane integrated ceramic casting mold as claimed in claim 1, is characterized in that, requires that the different ceramic size of selection is according to the castability of shell, core:
Ensureing the ceramic size requiring to select cast shell under sintering strength and precise manner from raising ventilation property and deformability;
Ensureing the ceramic size selecting to pour into a mould core under sintering strength and precise manner from raising intensity and easy detachability.
3. the core shell method for customizing of hollow turbine vane integrated ceramic casting mold as claimed in claim 1, it is characterized in that, the ceramic size of described cast shell can ensure sintering strength and precision, can also improve porosity and meet shell to ventilation property and deformability requirement;
The ceramic size of described cast core can form strengthening phase mullite in sintering process, effectively can improve sintering strength; Under the prerequisite ensureing slurry fluidity, more improve its solid load, more can improve the density of ceramic post sintering thus improve sintering strength.
4. the core shell method for customizing of hollow turbine vane integrated ceramic casting mold as claimed in claim 1, is characterized in that, being prepared as of described ceramic size:
1) by Gel-casting process requirement, by the acrylamide of certain mass ratio, N,N methylene bis acrylamide and sodium polyacrylate, after mixing, add deionized water, stirring and dissolving, be mixed with the premixed liquid that organism mass concentration is 10 ~ 20%;
2) by the requirement preparation solid powder of the ceramic size of cast shell, the ceramic size of cast core;
3) solid powder joined in premixed liquid respectively, fully stir, disperse, and regulate pH to be 9 ~ 11, obtain respectively pouring into a mould the ceramic size of shell, the ceramic size of cast core.
5. the core shell method for customizing of hollow turbine vane integrated ceramic casting mold as claimed in claim 1, it is characterized in that, hollow turbine vane integration resin die is provided with multiple cast gate, pours into a mould a kind of ceramic size with shaping a certain casting mold position by a cast gate.
6. the core shell method for customizing of hollow turbine vane integrated ceramic casting mold as claimed in claim 1, it is characterized in that, ceramic size is poured into a mould to hollow turbine vane integration resin die by vacuum casting machine, and provides applied vibration to promote the discharge of bubble in ceramic size in casting process by vacuum casting machine.
7. the core shell method for customizing of hollow turbine vane integrated ceramic casting mold as claimed in claim 1, it is characterized in that, temperature when described integrated ceramic base sinters is 1250 ~ 1350 DEG C.
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