CN109277529A - A kind of preparation method of model casting γ-TiAl-base alloy blade formwork - Google Patents
A kind of preparation method of model casting γ-TiAl-base alloy blade formwork Download PDFInfo
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- CN109277529A CN109277529A CN201710600391.4A CN201710600391A CN109277529A CN 109277529 A CN109277529 A CN 109277529A CN 201710600391 A CN201710600391 A CN 201710600391A CN 109277529 A CN109277529 A CN 109277529A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
- B22C1/10—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives for influencing the hardening tendency of the mould material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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Abstract
The present invention relates to the technical field of hot investment casting, the preparation method of specially a kind of model casting γ-TiAl-base alloy blade formwork.Firstly, being by weight the slurry that 5.0:1~7.0:1 is configured to that flow cup viscosity is 10~40 seconds by oxidation yttrium powder and organosol that granularity is 200~400 mesh；Then, the painting of above-mentioned slurry is hung on wax-pattern, grain scattering degree is yttrium oxide sand, emergy, aluminium vanadine sand, Shangdian clay sand or the quartz sand of 100~16 mesh, dry；7~8 times repeatedly, the last layer is coated with slurry, dry；It dewaxes, is sintered again.The present invention prepares formwork simple process, and slurry performance is easy to control, and the service life is long, and formwork inner surface quality is good, has suitable intensity, smooth blade surface of casting, without apparent surface porosity.This method can solve high activity, inductile TiAl alloy blade near net shape, eliminate blade surface it is loose the defects of control problem, be not limited only to hot investment casting TiAl blade, be equally applicable to casting TiAl-base alloy other structures part.
Description
Technical field
The present invention relates to the technical field of hot investment casting, specially a kind of model casting γ-TiAl-base alloy blade formwork
Preparation method.
Background technique
Gamma-TiAl alloy becomes new one due to its low-density, high intensity, high elastic modulus and its good high-temperature behavior
For the lightweight structural material in aerospace and automotive field, but influencing the widely applied biggest obstacle of TiAl element is its room temperature
Brittleness and unworkability.It is in solution that precision-investment casting, which can produce complex-shaped, near net shape structures part technology as one kind,
The effective ways of problem are stated, and there is good economy.It is " a kind of to prepare model casting γ-that inventor has invented a patent
The method of TiAl-base alloy formwork ", Al content is greater than the TiAl precision casting technology of 50at.% suitable for alloy, but at present
There is an urgent need to 40~50at.% of range of Al content in the TiAl alloy of application, in above-mentioned patent principal component corundum show it is lazy
Property it is insufficient, the cast(ing) surfaces such as blade, which have, apparent stains layer.Therefore, the more stable formwork system of one kind is developed with important
Meaning.
TiAl alloy is successfully applied to its advanced aero-engine low-pressure turbine by AM General electric appliance (GE) company
Blade, manufacturing method are that gravitational casting prepares blade blank, recycle electrical-chemistry method at dead size blade.TiAl alloy is net
The difficult point of size casting is: the TiAl alloy activity of molten condition is high, almost chemically reacts with all refractory materials,
Damage TiAl blade surface quality and dimensional accuracy.In recent years, yttrium oxide is since its relatively high chemical stability is in titanium conjunction
There are many close Application in Foundry of aurin, but adhesive techniques adaptable therewith be each businessman guarded rigidly with research worker it is secret
Close, the low slurry service life is the serious problem faced both at home and abroad at present.
Binder is link the most key in titanium and titanium aluminium base alloy casting technique, it is necessary to which satisfaction can bond fire proofed wood
Expect and have the requirement of hygrometric state and elevated temperature strength.Meanwhile the product reply liquid TiAl after roasting has preferable chemistry steady
It is qualitative.Common binder has waterglass, silica solution and silester, but its product of roasting SiO in model casting2It is anti-with liquid titanium
It should manufacture that is strong and cannot be used for accurate high end pieces.By the research and development of many years, zirconium or rare-earth sol are current titanium and titanium aluminium
The common binder of based alloy investment pattern precision casting meets requirement to a certain extent, but its slurry stability difference is precision castings
Batch production brings serious hindrance.
Another difficult point of TiAl alloy hot investment casting is: TiAl alloy poor fluidity, and loose tendency is high, and length and width are compared
The structural members such as big blade or complicated diffuser could only be completed to fill type under powerful centrifugal force synergism.Greatly
Quantity research shows that casting internal rarefaction can solve by adjusting the mode of pouring temperature field, and surface porosity and formwork surface
Quality and its composed structure design are closely related.Therefore, a kind of TiAl alloy blade hot investment casting formwork preparation method is developed
With important practical significance.
Summary of the invention
The object of the present invention is to provide a kind of model casting of stable structure γ-TiAl-base alloy blade formwork preparation sides
Method, this method can solve high activity, inductile TiAl alloy blade near net shape, eliminate the defects of blade surface is loose
Control problem, meet the needs of essence casting TiAl blade batch production, but be not limited to blade part, be also applied for TiAl diffuser,
The hot investment casting of the large, medium and small part such as swirler, booster turbine.
The technical scheme is that
A kind of preparation method of model casting γ-TiAl-base alloy blade formwork, includes the following steps:
It 1) is by weight that 5.0:1~7.0:1 is configured to organosol by oxidation yttrium powder that granularity is 200~400 mesh
The slurry that flow cup viscosity is 10~40 seconds；
2) painting of above-mentioned slurry is hung on wax-pattern, grain scattering degree be the yttrium oxide sands of 100~16 mesh, emergy, aluminium vanadine sand,
Shangdian clay sand or quartz sand, it is dry；7~8 times repeatedly, the last layer is coated with slurry, dry；
3) it dewaxes, sintering.
The model casting γ-TiAl-base alloy blade formwork preparation method, step 1) the slurry preparation process
In, activating agent, defoaming agent, dispersing agent are added, the weight content that activating agent accounts for slurry is 1~5 ‰, and defoaming agent accounts for the weight of slurry
Content is 1~3 ‰, and the weight content that dispersing agent accounts for slurry is 1~5%, and yttrium powder and activating agent will be aoxidized under stirring, is divided
Powder is added in organosol, is added defoaming agent, stirring 5 hours or more, is then placed 4~12 hours.
The model casting γ-TiAl-base alloy blade formwork preparation method, wax-pattern group described in step 2) immerse
3~10 seconds in the slurry that flow cup viscosity is 30~40 seconds, grain scattering degree is yttrium oxide sand, emergy or the quartz sand of 100~65 mesh,
It dries 3~15 hours at room temperature, repeats the 2nd layer of aforesaid operations, form surface layer；Then the 3rd~7 layered material slurry, slurry flow cup are coated with
Viscosity is 10~30 seconds, and every layer is coated with emergy, aluminium vanadine sand or the Shangdian clay sand that rear grain scattering degree is 45~16 mesh, is done at room temperature
Dry 4~30 hours, form reinforcing layer；The last layer is coated with the slurry that flow cup viscosity is 10~30 seconds, at room temperature drying time 40
~60 hours.
The model casting γ-TiAl-base alloy blade formwork preparation method, reinforcing layer slurry are schmigel or aluminium
Vanadine and silica solution are formulated by weight 3.0:1~4.0:1.
The model casting γ-TiAl-base alloy blade formwork preparation method, the last layer slurry are schmigel, aluminium
One of vanadine, Shangdian clay and coal gangue powder are formulated with silica solution by weight 3.0:1~4.0:1.
The model casting γ-TiAl-base alloy blade formwork preparation method, organosol are transition elements oxidation
The organosol of object；Alternatively, organosol is the organosol of the organo-metallic compound of Ti, Zr, Th transition elements；Alternatively,
Organosol is the organosol of rare earth element；The flow cup viscosity of organosol is 10~30 seconds.
The model casting γ-TiAl-base alloy blade formwork preparation method, the formwork formed after step 3) dewaxing
It is sintered again after being placed at room temperature for 4~10 hours, sintering temperature after heat preservation 1~4 hour, is cooled to room at 600~1200 DEG C
Temperature.
Design principle of the invention is:
The present invention is to inhibit mutually to roll into a ball between powder particles based on dispersing agent steric effect or certain electrical charge rejection principle
A kind of poly- method, to achieve the purpose that extend the slurry service life.The present invention is based on formwork structure designs, and TiAl molten liquid is made to exist
Mold filling and solidification moment is formed on its surface fast cooling layer, realizes solidification sequence from outward appearance to inner essence, so that surface porosity is led to blade
Center portion eliminates rarefaction defect by subsequent hot isostatic pressing process.
The invention has the advantages and beneficial effects that:
1. formwork system prepared by the present invention is suitable for being poured high activity TiAl alloy, reach dead size essence casting TiAl blade
And the surface finish requirements of other structural members.
2. the refractory material that the present invention uses is electric smelting Y2O3, compact structure, thermal expansion coefficient is small, there is good chemistry
Stability is a kind of excellent essence casting refractory material.
3. the binder that the present invention uses is a kind of organosol, which stablizes, and can place some months by 3 years
Interior performance is constant, and measuring its flow cup viscosity with flow cup viscosimeter is 10~30 seconds, which can occur water under suitable condition
Solution-condensation reaction forms three-dimensional net structure, fire resisting material particle is bonded together, certain intensity is formed.
4. the addition auxiliary agent used in the present invention is a kind of Inorganic Ammonium or organic ammonium or mixture, be conducive to disperse slurry group
It is poly-, extend the slurry service life.
5. the present invention is used to prepare formwork, powder and activating agent, dispersing agent are added to binder under stirring
In, a small amount of defoaming agent is added, is sufficiently stirred, preferably at 5 hours or more, then places 4~12 hours, is returned conducive to slurry
Property；The slurry of property is sufficiently returned, being coated with property and mobility are good, and gelling is shunk small when hardening, investment shell intensity height.
5. the activating agent in the present invention has good wetting and penetrating power, foam is few and is easy to defoam, and does not influence to expect
The stability of slurry, it is nontoxic, inexpensive.
6. the capstock starch liquid weight ratio control in the present invention changes in 5.0:1 between 7.0:1, institute is depended primarily on
Need the requirement of Blade roughcast surface roughness；The slurry that silica solution and schmigel are prepared can be used in reinforcing layer, and it is molten that silicon can also be used
The slurry that glue and aluminium vanadine/Shangdian clay are prepared, reinforcing layer phosphoric acid successively reduce, so that pasting can penetrate into upper one layer of painting
In the stucco gap of material and can good wetting, to exclude the air in sand grains gap, make to be formed uniformly continuous between each layer and
The entirety closely inlayed again, prevents from forming hole, crack and layering, it is ensured that shell structural strength.
7. the method for the present invention prepares formwork, stucco with yttrium oxide sand/emergy/aluminium vanadine sand/Shangdian clay sand from it is inner to
Outer gradually overstriking, 1~2 layer is spread thinner sand, such as: 100~65 mesh, reinforcing layer usually spread thicker sand, such as: 45~16
Mesh.In order to avoid layering, the granularity of selected sand and the viscosity of slurry will be suitable for that both will not influence Surface Quality of Mould Shell,
The relatively rough back side is advantageously formed, is securely joined with to be conducive to same reinforced layered slurry.
8. the present invention can be dewaxed with water vapour, facilitate nontoxicity.
Detailed description of the invention
Fig. 1-Fig. 2 is using obtained γ-TiAl blade exemplar of the invention and in 1000lux luminosity lower surface pattern.Its
In, Fig. 1 is γ-TiAl blade exemplar；Fig. 2 is 1000lux luminosity lower surface pattern.
Fig. 3 is the γ-TiAl blade X-ray detection obtained using the present invention as a result, having no obvious yttrium oxide high density folder
Miscellaneous defect.
Fig. 4 is electron probe detection γ-TiAl blade surface each element along cross section from outward appearance to inner essence distribution situation, is as a result shown
Show that Blade roughcast surface does not have apparent composition transfer.In figure, abscissa Distance from Cast Surface represent to
The distance (mm) of cast(ing) surface；Ordinate Counts, which is represented, to be counted.
Specific embodiment
In the specific implementation process, model casting γ of the present invention-TiAl-base alloy blade formwork preparation method, including such as
Lower step:
It 1) is by weight that 5.0:1~7.0:1 is configured to organosol by oxidation yttrium powder that granularity is 200~400 mesh
The slurry that flow cup viscosity is 10~40 seconds, oxidation yttrium powder are sintered state or melting state；Wherein, organosol is transition elements oxidation
The organosol of object, the organosol of the organo-metallic compound of Ti, Zr, Th transition elements or rare earth element (mainly Y or La
Series elements) organosol, flow cup viscosity be 10~30 seconds.
2) painting of above-mentioned slurry is hung on wax-pattern, grain scattering degree is the reinforcing sand of 100~16 mesh, dry；Repeatedly 7~8
Secondary, the last layer is coated with slurry, dry；
3) it dewaxes, sintering.The formwork formed after dewaxing is sintered again after being placed at room temperature for 4~10 hours, sintering temperature
At 600~1000 DEG C, after heat preservation 1~4 hour, it is cooled to room temperature.
In step 1) the slurry preparation process, activating agent, defoaming agent, dispersing agent are added, wherein activating agent accounts for slurry
Weight content be 1~5 ‰, defoaming agent account for slurry weight content be 1~3 ‰, dispersing agent account for slurry weight content be 1~
5%, oxidation yttrium powder and activating agent, dispersing agent are added in organosol under stirring, add defoaming agent, stirring 5
Hour or more (generally 5~10 hours), then place 4~12 hours.Wherein, defoaming agent can be alcohols, such as: n-octyl alcohol,
Isooctanol etc. can also be butyl glycol ether phosphate；Common activating agent can be JFC (polyoxyethylated alkyl alcohol), ring
Oxygen compound (such as: polyoxyethylated alkyl alcohol) or polyethylene glycols activating agent, dispersing agent can choose common Inorganic Ammonium
Class or organic ammonium class or mixture.
Wax-pattern group described in step 2) immerses flow cup viscosity, and grain scattering degree is 100~
Yttrium oxide sand, emergy or the quartz sand of 65 mesh are dried 3~15 hours at room temperature, repeat the 2nd layer of aforesaid operations, form surface layer；
Then it is coated with the 3rd~7 layered material slurry, slurry flow cup viscosity is 10~30 seconds, and every layer is coated with the corundum that rear grain scattering degree is 45~16 mesh
Sand, aluminium vanadine sand or Shangdian clay sand are dried 4~30 hours at room temperature, form reinforcing layer, and reinforcing layer slurry is schmigel or aluminium vanadium
Soil and silica solution are formulated by weight 3.0:1~4.0:1.The last layer is coated with the slurry that flow cup viscosity is 10~30 seconds,
Drying time 40~60 hours at room temperature, the last layer slurry are one of schmigel, aluminium vanadine, Shangdian clay and coal gangue powder and silicon
Colloidal sol is formulated by weight 3.0:1~4.0:1, and schmigel, aluminium vanadine, Shangdian clay and coal gangue powder are sintered state or melting
State.
In the present invention, drying means is the drying plant that temperature and humidity is suitable for, and drying plant temperature is 22 ± 2 DEG C, and humidity is
30~70%.
It elaborates below with reference to embodiment to the present invention, but protection scope of the present invention is not limited only to following implementation
Example.
Embodiment 1
In the present embodiment, use 320 mesh yttrium oxides and yttrium colloidal sol (organosol of metallic yttrium) weight ratio for 5.5:1, it is living
Property agent (polyoxyethylated alkyl alcohol, also known as JFC) weight content be 4 ‰, the weight of defoaming agent GP (butyl glycol ether phosphate)
Measuring content is 2 ‰, and the weight content of dispersing agent is 3%, is added to oxidation yttrium powder with activating agent, dispersing agent under stirring
In organosol, defoaming agent is added, is sufficiently stirred 5 hours, then places 4 hours, prepare slurry 100kg, gained pulp flow
Cup viscosity is 30 seconds.Cleaned wax-pattern group is immersed in slurry and is taken out after 5 seconds, the net extra slurry of control is taken out, spreads 100~60
Mesh emergy repeats the aforesaid operations second layer after dry, every layer is dried 12 hours at room temperature, forms surface layer；It is coated with the 3rd~7 layer
Slurry, slurry flow cup viscosity are 20 seconds, and every layer is coated with the emergy that rear grain scattering degree is 45~24 mesh, every layer dry at room temperature it is 24 small
When, reinforcing layer is formed, reinforcing layer slurry schmigel and silica solution are formulated by weight 3.5:1；The last layer is only coated with
Slurry used by reinforcing layer, at room temperature drying time 48 hours, specific process parameter such as table 1.Wax-pattern sufficiently after drying is used
Water vapour dewaxing, the formwork for having taken off wax are sintered after being placed at room temperature for 6 hours, and sintering temperature is 1100 DEG C, and heat preservation 2 hours cold
But to room temperature, gained formwork inner surface is bright and clean, and intensity is high.
Table 1
| The number of plies | Flow cup viscosity (second) | Temperature (DEG C) | Humidity (%) | Room temperature (DEG C) | Stucco | Drying time |
| 1~2 layer | 30 | 15~20 | 40~80 | 22±2 | 100~60 mesh | 12 hours |
| 3~7 layers | 20 | 15~20 | 30~60 | 22±2 | 45~24 mesh | 24 hours |
| 8 layers | 20 | 15~20 | 30~60 | 22±2 | Not stucco | 48 hours |
The formwork of above method preparation is carried out to the hot investment casting test for the Ti-46Al alloy vane that length is 300mm.It will
Formwork is put into sandbox levelling and fixes, and 950 DEG C are preheated in Muffle furnace and keeps the temperature 2 hours.With water jacketed copper crucible induction furnace melting
Gamma-TiAl alloy, centrifugal casting γ-TiAl blade.Blade surface is bright and clean, without scab phenomenon, does not have under the illumination of 1000 lux
Have macroscopic loose.
Interpretation of result:
As Figure 1-Figure 2, it is observed under 1000 lux luminosity using the γ-TiAl blade sample surface that the present invention obtains
Macroscopic surface porosity is not found.
As shown in figure 3, having not seen yttrium oxide height in x-ray flaw detection using the γ-TiAl blade that the present invention obtains
Density inclusions defect, it is seen that the formwork quality of the method for the present invention preparation is stablized, and blade metallurgical quality can be effectively controlled.
As shown in figure 4, not apparent by surface and inner elemental composition using the γ-TiAl Blade roughcast that the present invention obtains
Fluctuation shows that with gamma-TiAl alloy interfacial reaction does not occur for formwork prepared by the present invention.
Comparative example
Yttrium oxide shuttering is prepared with conventional method and carries out casting Ti-46Al alloy vane test, and formwork is put into sandbox
Levelling fixes, and 950 DEG C are preheated in Muffle furnace and keeps the temperature 2 hours.With water jacketed copper crucible induction furnace melting gamma-TiAl alloy,
The tensile test bar of the pure titanium of centrifugal casting, to be compared with embodiment 1.As a result, it has been found that blade surface scab is serious, exist serious
Surface porosity, show that the invention is obviously improved blade surface quality.
Embodiment 2
Difference from Example 1 is:
In the present embodiment, use 300 mesh oxidation yttrium powder and yttrium colloidal sol (organosol of metallic yttrium) weight ratio for 6:1, it is living
Property agent (polyoxyethylated alkyl alcohol) weight content be 3 ‰, the weight content of defoaming agent (isooctanol) is 2 ‰, dispersing agent
Weight content is 2%, and oxidation yttrium powder and activating agent, dispersing agent are added in organosol under stirring, adds and disappears
Infusion is sufficiently stirred 8 hours, then places 8 hours, prepares slurry 100kg, and gained slurry flow cup viscosity is 35 seconds.It will cleaning
Good wax-pattern group immerses in slurry to be taken out after 4 seconds, takes out the net extra slurry of control, is spread 100~65 mesh emergies, is repeated after dry
The aforesaid operations second layer, every layer is dried 10 hours at room temperature, forms surface layer；It is coated with the 3rd~7 layered material slurry, slurry flow cup viscosity is
25 seconds, every layer was coated with the emergy that rear grain scattering degree is 45~24 mesh, and every layer is dried 20 hours at room temperature, forms reinforcing layer, reinforced
Layered material slurry schmigel and silica solution are formulated by weight 3:1；The last layer is coated with slurry used by reinforcing layer, room temperature
40 hours lower drying times, specific process parameter such as table 1.Wax-pattern sufficiently after drying is dewaxed with water vapour, has taken off the formwork of wax
It is sintered after being placed at room temperature for 4 hours, sintering temperature is 1000 DEG C, and heat preservation is cooled to room temperature for 4 hours, gained formwork inner surface
Bright and clean, intensity is high.
Embodiment 3
Difference from Example 1 is:
In the present embodiment, use 325 mesh oxidation yttrium powder and zirconium colloidal sol (organosol of metal zirconium) weight ratio for 4:1, it is living
Property agent (poly- Isopropanediol ether) weight content be 1 ‰, the weight content of defoaming agent (n-octyl alcohol) is 1 ‰, the weight of dispersing agent
Content is 4%, and oxidation yttrium powder and activating agent, dispersing agent are added in organosol under stirring, add defoaming agent,
It is sufficiently stirred 6 hours, then places 12 hours, prepare slurry 10kg, gained slurry flow cup viscosity is 22 seconds.By cleaned wax
Mould group immerses in slurry to be taken out after 3 seconds, is taken out the net extra slurry of control, is spread 100~65 mesh yttrium oxide sands, repeatedly above-mentioned after dry
The second layer is operated, every layer is dried 15 hours at room temperature, forms surface layer；It is coated with the 3rd~7 layered material slurry, slurry flow cup viscosity is 15 seconds,
Every layer is coated with the emergy that rear grain scattering degree is 24~16 mesh, and every layer is dried 30 hours at room temperature, forms reinforcing layer, reinforcing layer slurry
It is formulated with schmigel and silica solution by weight 4:1；The last layer is coated with slurry used by reinforcing layer, dries at room temperature
Time 60 hours, specific process parameter such as table 1.Wax-pattern sufficiently after drying is dewaxed with water vapour, has taken off the formwork of wax in room temperature
It being sintered after placing 10 hours, sintering temperature is 950 DEG C, and heat preservation is cooled to room temperature for 1 hour, and gained formwork inner surface is bright and clean,
Intensity is high.
Embodiment and comparative example the result shows that, the present invention prepares formwork simple process, and slurry performance is easy to control, the service life
Long, formwork inner surface quality is good, has suitable intensity, smooth blade surface of casting, without apparent surface porosity, the invention
It is not limited only to hot investment casting TiAl blade, is equally applicable to casting TiAl-base alloy other structures part.
Claims (7)
1. a kind of model casting γ-TiAl-base alloy blade formwork preparation method, which comprises the steps of:
It 1) is by weight that 5.0:1~7.0:1 is configured to flow cup by oxidation yttrium powder and organosol that granularity is 200~400 mesh
The slurry that viscosity is 10~40 seconds；
2) painting of above-mentioned slurry is hung on wax-pattern, grain scattering degree is yttrium oxide sand, emergy, the aluminium vanadine sand, upper shop of 100~16 mesh
Soil sand or quartz sand, it is dry；7~8 times repeatedly, the last layer is coated with slurry, dry；
3) it dewaxes, sintering.
2. model casting γ described in accordance with the claim 1-TiAl-base alloy blade formwork preparation method, it is characterised in that:
In step 1) the slurry preparation process, add activating agent, defoaming agent, dispersing agent, activating agent account for slurry weight content be 1~
5 ‰, the weight content that defoaming agent accounts for slurry is 1~3 ‰, and the weight content that dispersing agent accounts for slurry is 1~5%, in stirring
It is lower that oxidation yttrium powder and activating agent, dispersing agent are added in organosol, defoaming agent is added, stirring 5 hours or more, is then put
It sets 4~12 hours.
3. model casting γ described in accordance with the claim 1-TiAl-base alloy blade formwork preparation method, it is characterised in that:
Wax-pattern group described in step 2) immerses in the slurry that flow cup viscosity is 30~40 seconds 3~10 seconds, and grain scattering degree is the oxygen of 100~65 mesh
Change yttrium sand, emergy or quartz sand, dry 3~15 hours at room temperature, repeat the 2nd layer of aforesaid operations, forms surface layer；Then it is coated with
3rd~7 layered material slurry, slurry flow cup viscosity are 10~30 seconds, and every layer is coated with emergy, the aluminium vanadine that rear grain scattering degree is 45~16 mesh
Sand or Shangdian clay sand are dried 4~30 hours at room temperature, form reinforcing layer；It is 10~30 seconds that the last layer, which is coated with flow cup viscosity,
Slurry, at room temperature drying time 40~60 hours.
4. model casting γ described in accordance with the claim 3-TiAl-base alloy blade formwork preparation method, it is characterised in that:
Reinforcing layer slurry is that schmigel or aluminium vanadine and silica solution are formulated by weight 3.0:1~4.0:1.
5. model casting γ described in accordance with the claim 3-TiAl-base alloy blade formwork preparation method, it is characterised in that:
The last layer slurry is for one of schmigel, aluminium vanadine, Shangdian clay and coal gangue powder with silica solution by weight 3.0:1~4.0:1
It is formulated.
6. model casting γ described in accordance with the claim 1-TiAl-base alloy blade formwork preparation method, it is characterised in that:
Organosol is the organosol of transition elements oxide of mutually；Alternatively, organosol is the organic metal of Ti, Zr, Th transition elements
The organosol of compound；Alternatively, organosol is the organosol of rare earth element；The flow cup viscosity of organosol is 10~30
Second.
7. model casting γ described in accordance with the claim 1-TiAl-base alloy blade formwork preparation method, it is characterised in that:
The formwork formed after step 3) dewaxing is sintered again after being placed at room temperature for 4~10 hours, sintering temperature at 600~1200 DEG C,
After heat preservation 1~4 hour, it is cooled to room temperature.
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| CN201710600391.4A CN109277529A (en) | 2017-07-21 | 2017-07-21 | A kind of preparation method of model casting γ-TiAl-base alloy blade formwork |
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| CN201710600391.4A CN109277529A (en) | 2017-07-21 | 2017-07-21 | A kind of preparation method of model casting γ-TiAl-base alloy blade formwork |
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| CN201710600391.4A Pending CN109277529A (en) | 2017-07-21 | 2017-07-21 | A kind of preparation method of model casting γ-TiAl-base alloy blade formwork |
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| CN114631724A (en) * | 2022-03-31 | 2022-06-17 | 江苏华钛瑞翔科技有限公司 | Titanium alloy teapot and near-net forming method |
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