CN101462150A - Method for preparing TiAl-based alloy formwork by wax mold casting - Google Patents
Method for preparing TiAl-based alloy formwork by wax mold casting Download PDFInfo
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- CN101462150A CN101462150A CNA2007101590434A CN200710159043A CN101462150A CN 101462150 A CN101462150 A CN 101462150A CN A2007101590434 A CNA2007101590434 A CN A2007101590434A CN 200710159043 A CN200710159043 A CN 200710159043A CN 101462150 A CN101462150 A CN 101462150A
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- 239000000956 alloy Substances 0.000 title claims abstract description 36
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 35
- 229910010038 TiAl Inorganic materials 0.000 title claims abstract description 30
- 238000005266 casting Methods 0.000 title claims abstract description 24
- 238000009415 formwork Methods 0.000 title claims description 28
- 238000000034 method Methods 0.000 title abstract description 6
- 239000004576 sand Substances 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 26
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 22
- 238000001035 drying Methods 0.000 claims abstract description 21
- 238000002360 preparation method Methods 0.000 claims abstract description 17
- 238000005245 sintering Methods 0.000 claims abstract description 13
- 239000003245 coal Substances 0.000 claims abstract description 9
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 29
- 239000010410 layer Substances 0.000 claims description 22
- 239000013530 defoamer Substances 0.000 claims description 20
- 239000000080 wetting agent Substances 0.000 claims description 20
- 238000003723 Smelting Methods 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 10
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical group CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 9
- 239000004575 stone Substances 0.000 claims description 8
- 239000002344 surface layer Substances 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000002270 dispersing agent Substances 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 238000009736 wetting Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 6
- 239000001301 oxygen Substances 0.000 abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000005495 investment casting Methods 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 239000002002 slurry Substances 0.000 abstract 6
- 238000009416 shuttering Methods 0.000 abstract 4
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 abstract 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 2
- 229910052593 corundum Inorganic materials 0.000 abstract 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 2
- 235000019580 granularity Nutrition 0.000 description 19
- 239000011230 binding agent Substances 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000006213 oxygenation reaction Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- 229910008051 Si-OH Inorganic materials 0.000 description 1
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- 229910006358 Si—OH Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000002929 anti-fatigue Effects 0.000 description 1
- 230000003026 anti-oxygenic effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 229910052574 oxide ceramic Inorganic materials 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Mold Materials And Core Materials (AREA)
Abstract
The invention relates to the field of precision casting, in particular to a method for preparing a shuttering for an investment casting TiAl-based alloy with low cost and strong stability. The method comprises the following steps: preparing slurry of which flow cup viscosity is 10 to 25 seconds from Y2O3 powder of 200 to 400 meshes on granularity and silica sol according to a weight ratio of 2:1-3:1; then, coating the slurry on a wax mould, sprinkling electric melting Y2O3 sand of which sand granularity is 40 to 100 meshes on the wax mould, and drying the wax mould; preparing slurry of which flow cup viscosity is 10 to 30 seconds by adopting Al2O3 powder of 200 to 400 meshes on granularity and silica sol according to a weight ratio of 3:1-4:1, coating the second layer, sprinkling electric melting Al2O3 sand of which sand granularity is 40 to 80 meshes on the wax mould, and drying the wax mould; preparing slurry by adopting bauxite and silica sol according to a weight ratio of 3:1-4:1, and sprinkling coal gangue sand of which sand granularity is 16 to 24 meshes on the wax mould; after three layers, finally hanging the bauxite slurry, and drying the slurry; and then removing wax, and sintering the mould. The method has the advantages of simple shuttering preparation process and low cost of the shuttering, can effectively control reaction of a TiAl-based alloy cast and a shuttering surface material, reduce oxygen feeding amount of the alloy, and is suitable for casting a TiAl-based alloy cast.
Description
Technical field
The present invention relates to the hot investment casting field, be specially a kind of model casting TiAl base alloy formwork preparation method low-cost, that stability is strong.
Background technology
Improve the thrust of aero-engine, alleviate the weight of engine, save the important directions that fuel oil has become the materials for aeroengines design; And the burn incompletely that the important topic that Hyundai Motor industry faces is a gasoline causes tail gas that oil consumption height and motor vehicle emission go out to problem that environment polluted, the approach that addresses this problem is to improve the efficiency of combustion of fuel, and the lightweight of member material and high-wearing feature are one of effective means of fuel raising efficiency of combustion.Therefore the material as Aeronautics and Astronautics device engine and automobile engine member should possess " lighter, more firm, stronger and more heat-resisting " four specific characters, TiAl base alloy is just because of having low-density, high-melting-point, high specific strength, good high-temperature antioxygenic property and certain high temperature creep strength and high temperature anti-fatigue ability and become the optimal candidate material of structure member in Aero-Space of new generation and the automotive field.TiAl base alloy limits its extensive use because of itself room temperature fragility and unworkability, and is especially more difficult for component processing complex-shaped and that draw ratio is bigger.Model casting is as a kind of technology for preparing complex-shaped near-net-shape foundry goods, can effectively address the above problem, as everyone knows, TiAl base alloy has very high activity under the molten condition, almost with all refractory material generation chemical reactions, cause the alloy oxygen content to increase, influence the processing characteristics and the serviceability of alloy component.Therefore, the surface material of formwork is most important for the oxygen content in the control alloy in the model casting, and the formwork material should be under the prerequisite that satisfied preparation TiAl base alloy component requires simultaneously, and cost is cheap.
In the model casting of TiAl base alloy, New Oxide Ceramic Shell Mould is present most widely used a kind of technology, and surface material mainly contains Al
2O
3, ZrO
2, ThO
2And Y
2O
3Deng oxide, binding agent mainly contains refractory metal oxide colloid or metallo-organic compound.ThO in the surface material
2The most difficult and molten titanium reacts, but because it has radioactivity, uses less; Y
2O
3also difficultly react with the TiAl alloy, but expensive, other Al
2O
3, ZrO
2Chemical reaction takes place in TiAl easy and melting, makes alloy oxygenation, reduces its processing and serviceability.
Summary of the invention
The object of the invention provides a kind of model casting TiAl base alloy with formwork preparation method low-cost, that stability is strong, adopts the standby TiAl alloy component of the party's legal system to satisfy instructions for use.
Technical scheme of the present invention is:
A kind of model casting TiAl base alloy formwork preparation method low-cost, that stability is strong is characterized in that step is as follows:
1) with granularity is 200-400 purpose Y
2O
3Powder and Ludox are the 10-25 slip of second for 2:1～3:1 is configured to flow cup viscosity by weight;
2) above-mentioned slip is coated with hangs on the wax-pattern, the stucco granularity is 40-100 purpose electric smelting Y
2O
3Sand, drying; Adopt 200-400 purpose Al
2O
3It is the 10-30 slip of second that powder and Ludox are configured to flow cup viscosity by weight 3:1～4:1, is coated with the 2nd layer, spreads the electric smelting Al of 40-80 order granularity
2O
3Sand, drying; Adopt bauxite and Ludox by weight the slip for 3:1～4:1 configuration, the stucco granularity is 16-24 purpose bastard coal stone sand again; After 3 layers, hang at last time bauxite slip, drying;
3) dewaxing, sintering.
Described step 1), add wetting agent, defoamer in the Pulp preparation process, wherein to account for the percentage by weight of slip be 1-5 ‰ to wetting agent, and defoamer accounts for the percentage by weight 1-5 ‰ of slip, adds Y under stirring
2O
3Powder adds wetting agent, defoamer afterwards successively, stirs more than 10 hours, can coating;
Described wetting agent is polyethenoxy alkylphenols, low bubble wetting dispersing agent RFCF-10 or OPEO; Described defoamer is isopropyl alcohol, silicones or positive the eleventh of the twelve Earthly Branches alcohol.
Described step 2), wax-pattern group immersion flow cup viscosity is the 10-30 Y of second
2O
3Guarantee that slip evenly hangs on the wax-pattern 3-8 second in the slip, and the stucco granularity is 40-100 purpose Y
2O
3Sand, temperature are 20-25 ℃, and is dry more than 8 hours in the environment of humidity 30-70%, forms surface layer; Adopt 200-400 purpose Al
2O
3It is the 10-30 slip of second that powder and Ludox are configured to flow cup viscosity by weight 3:1～4:1, is coated with the 2nd layer, spreads the electric smelting Al of 40-80 order granularity
2O
3Sand is 20-25 ℃ in temperature, and is dry more than 10 hours in the environment of humidity 30-60%, forms transition zone; Adopt then the bauxite slip, flow cup viscosity is 10-20 second, and the stucco granularity is 16-24 purpose bastard coal stone sand, is coated with 3～5 layers, and every layer is 20-25 ℃ in temperature all, and is dry more than 12 hours in the environment of humidity 30-60%, forms back-up coat; Last one deck is coated with the bauxite slip, is 20-25 ℃ in temperature, and is dry more than 10 hours in the environment of humidity 30-60%;
Wherein, back-up coat and last slip all are that 200-400 order bauxite powder and Ludox form by weight 3:1～4:1 configuration;
Described Y
2O
3Powder is sintered state, Y
2O
3Sand is the electric smelting attitude;
Described step 3), the formwork that the dewaxing back forms carries out sintering again after room temperature is placed 4-10 hour, and the temperature of sintering is incubated 1-3 hour at 800-1200 ℃, and stove is chilled to below 300 ℃ and can takes out.
Advantage of the present invention:
1, the present invention adopts the Y of good stability
2O
3As the surface material of shell mould, the oxygen feeding amount of control TiAl alloy is fit to casting TiAl base alloy.
2, the Y of the present invention's employing
2O
3Refractory material is the electric smelting material, has compact structure, little, the good chemical stability of thermal coefficient of expansion, is best essence casting TiAl base alloy refractory material.
3, the binding agent of the present invention's employing is traditional Ludox, the SiO of this colloidal sol
2Percentage by weight is 20～30%, this colloidal sol stable performance, can place half a year to several years performances constant, viscosity is 10～30s, the Si-O-Si key of micelle inside forms the cubic network structure, and colloidal particle and water contact interface then form the Si-OH hydration shell, and fire resisting material particle is bonded together, formation has the formwork of certain intensity, and is with low cost.
4, the present invention adopts Al
2O
3With the Ludox slip as the transition zone slip, be coated with and spread electric smelting Al
2O
3Sand, guarantee surface layer and backing layer in conjunction with fastness.
5, shell mould of the present invention is with low cost, and the serviceability of casting TiAl base member is good, and adopts shell moulded casting alloy component of the present invention, and alloy material can return use once.
6, the present invention adopts steam dewaxing, convenient nontoxic.
Description of drawings
Fig. 1 is that formwork waters a glass internal surface shape.
Fig. 2 is an element stems position formwork pattern.
The specific embodiment
Embodiment 1
1) with granularity is 200 purpose Y
2O
3Powder and Ludox be by weight being 3:1 configuration, interpolation wetting agent, defoamer, and wherein to account for the percentage by weight of slip be 3 ‰ to wetting agent, the percentage by weight that defoamer accounts for slip is 3 ‰, adds Y under stirring
2O
3Powder adds wetting agent, defoamer afterwards successively, stirs 10 hours, is made into flow cup viscosity and is 16 seconds slip; In the present embodiment, wetting agent is polyethenoxy alkylphenols, and defoamer is isopropyl alcohol.
2) the wax-pattern group is immersed above-mentioned Y
2O
3In the slip 6 seconds, guarantee that slip evenly hangs on the wax-pattern, the stucco granularity is 80 purpose electric smelting Y
2O
3Sand, temperature are 21 ℃, and drying is 8 hours in the environment of humidity 50%, forms surface layer; Adopt 320 purpose Al
2O
3It is 18 seconds slip that powder and Ludox are configured to flow cup viscosity by weight 3:1, is coated with the 2nd layer, spreads the electric smelting Al of 80 order granularities
2O
3Sand is 21 ℃ in temperature, and drying is 10 hours in the environment of humidity 50%, forms transition zone; Adopt then the bauxite slip, flow cup viscosity is 16 seconds, and the stucco granularity is 20 purpose bastard coal stone sands, is coated with 4 layers, and every layer is 21 ℃ in temperature all, and drying is 14 hours in the environment of humidity 50%, forms back-up coat; Last one deck is coated with the bauxite slip, is 21 ℃ in temperature, and drying is 11 hours in the environment of humidity 35%; Described back-up coat and last slip all are that 200 order bauxite powder and Ludox form by weight the 3:1 configuration.
3) after employing steam mode dewaxed, formwork carried out sintering again after room temperature is placed 8 hours, and the temperature of sintering is incubated 2 hours at 1100 ℃, and stove is chilled to 300 ℃ of taking-ups, and the gained formwork waters a glass inner surface, the element stems position is bright and clean, and intensity is good, as shown in Figure 1 and Figure 2.
With the formwork casting Ti46Al1B alloy of said method preparation, motlten metal and formwork slightly respond, and alloy is oxygenation 200ppm Wt% from formwork; And adopt common Al
2O
3Shell mould, the oxygen feeding amount of alloy has reached 600ppm Wt%.As seen, Y
2O
3The shell mould surface material has good chemical stability.
Embodiment 2
1) with granularity is 320 purpose Y
2O
3Powder and Ludox be by weight being 2.5:1 configuration, interpolation wetting agent, defoamer, and wherein to account for the percentage by weight of slip be 2 ‰ to wetting agent, the percentage by weight that defoamer accounts for slip is 3 ‰, adds Y under stirring
2O
3Powder adds wetting agent, defoamer afterwards successively, stirs 10 hours, is made into flow cup viscosity and is 13 seconds slip; In the present embodiment, wetting agent is low bubble wetting dispersing agent RFCF-10, and defoamer is silicones.
2) the wax-pattern group is immersed above-mentioned Y
2O
3In the slip 6 seconds, guarantee that slip evenly hangs on the wax-pattern, the stucco granularity is 100 purpose electric smelting Y
2O
3Sand, temperature are 25 ℃, and drying is 8 hours in the environment of humidity 40%, forms surface layer; Adopt 320 purpose Al
2O
3It is 20 seconds slip that powder and Ludox are configured to flow cup viscosity by weight 3.5:1, is coated with the 2nd layer, spreads the electric smelting Al of 80 order granularities
2O
3Sand is 25 ℃ in temperature, and drying is 10 hours in the environment of humidity 40%, forms transition zone; Adopt then the bauxite slip, flow cup viscosity is 16 seconds, and the stucco granularity is 24 purpose bastard coal stone sands, is coated with 5 layers, and every layer is 25 ℃ in temperature all, and drying is 14 hours in the environment of humidity 40%, forms back-up coat; Last one deck is coated with the bauxite slip, is 25 ℃ in temperature, and drying is 11 hours in the environment of humidity 40%; Described back-up coat and last slip all are that 320 order bauxite powder and Ludox form by weight the 3.5:1 configuration.
3) after employing steam mode dewaxed, formwork carried out sintering again after room temperature is placed 10 hours, and the temperature of sintering is incubated 1 hour at 1200 ℃, and stove is chilled to 300 ℃ of taking-ups, gained formwork any surface finish, and intensity is good.
Embodiment 3
1) with granularity is 270 purpose Y
2O
3Powder and Ludox be by weight being 2:1 configuration, interpolation wetting agent, defoamer, and wherein to account for the percentage by weight of slip be 1 ‰ to wetting agent, the percentage by weight that defoamer accounts for slip is 5 ‰, adds Y under stirring
2O
3Powder adds wetting agent, defoamer afterwards successively, stirs 10 hours, is made into flow cup viscosity and is 18 seconds slip; In the present embodiment, wetting agent is OPEO, and defoamer is positive the eleventh of the twelve Earthly Branches alcohol.
2) the wax-pattern group is immersed above-mentioned Y
2O
3In the slip 8 seconds, guarantee that slip evenly hangs on the wax-pattern, the stucco granularity is 40 purpose electric smelting Y
2O
3Sand, temperature are 23 ℃, and drying is 8 hours in the environment of humidity 30%, forms surface layer; Adopt 270 purpose Al
2O
3It is 22 seconds slip that powder and Ludox are configured to flow cup viscosity by weight 4:1, is coated with the 2nd layer, spreads the electric smelting Al of 60 order granularities
2O
3Sand is 23 ℃ in temperature, and drying is 10 hours in the environment of humidity 30%, forms transition zone; Adopt then the bauxite slip, flow cup viscosity is 16 seconds, and the stucco granularity is 16 purpose bastard coal stone sands, is coated with 3 layers, and every layer is 23 ℃ in temperature all, and drying is 14 hours in the environment of humidity 30%, forms back-up coat; Last one deck is coated with the bauxite slip, is 23 ℃ in temperature, and drying is 11 hours in the environment of humidity 30%; Described back-up coat and last slip all are that 270 order bauxite powder and Ludox form by weight the 4:1 configuration.
3) after employing steam mode dewaxed, formwork carried out sintering again after room temperature is placed 4 hours, and the temperature of sintering is incubated 3 hours at 800 ℃, and stove is chilled to 300 ℃ of taking-ups, gained formwork any surface finish, and intensity is good.
Embodiment result shows that the present invention uses a small amount of Y
2O
3As surface material, Al
2O
3As the intermediate layer, traditional Ludox is as binding agent, and backing layer adopts bauxite and Ludox slip, is coated with and spreads the bastard coal stone sand, prepare with low cost, the ceramic shell mo(u)ld that surface material is stable.Process for making shell of the present invention is simple, and can effectively control the reaction of TiAl base alloy-steel casting and shell mould surface material, falls low-alloyed oxygen feeding amount, is applicable to casting TiAl base alloy-steel casting, and the TiAl base alloy component of preparation is superior in quality.
Claims (7)
1, a kind of formwork preparation method of model casting TiAl base alloy is characterized in that step is as follows:
1) with granularity is 200-400 purpose Y
2O
3Powder and Ludox are the 10-25 slip of second for 2:1～3:1 is configured to flow cup viscosity by weight;
2) above-mentioned slip is coated with hangs on the wax-pattern, the stucco granularity is 40-100 purpose electric smelting Y
2O
3Sand, drying; Adopt 200-400 purpose Al
2O
3It is the 10-30 slip of second that powder and Ludox are configured to flow cup viscosity by weight 3:1～4:1, is coated with the 2nd layer, spreads the electric smelting Al of 40-80 order granularity
2O
3Sand, drying; Adopt bauxite and Ludox by weight the slip for 3:1～4:1 configuration, the stucco granularity is 16-24 purpose bastard coal stone sand again; After 3 layers, hang at last time bauxite slip, drying;
3) dewaxing, sintering.
2, according to the formwork preparation method of the described model casting TiAl of claim 1 base alloy, it is characterized in that: described step 1), add wetting agent, defoamer in the Pulp preparation process, wherein to account for the percentage by weight of slip be 1-5 ‰ to wetting agent, defoamer accounts for the percentage by weight 1-5 ‰ of slip, adds Y in the Ludox under stirring
2O
3Powder adds wetting agent, defoamer afterwards successively, stirs more than 10 hours, can coating.
3, according to the formwork preparation method of the described model casting TiAl base of claim 1 alloy, it is characterized in that: described wetting agent is polyethenoxy alkylphenols, low bubble wetting dispersing agent RFCF-10 or OPEO; Described defoamer is isopropyl alcohol, silicones or positive the eleventh of the twelve Earthly Branches alcohol.
4, according to the formwork preparation method of the described model casting TiAl base of claim 1 alloy, it is characterized in that: described step 2), it is the 10-30 Y of second that the wax-pattern group immerses flow cup viscosity
2O
3Guarantee that slip evenly hangs on the wax-pattern 3-8 second in the slip, and the stucco granularity is 40-100 purpose Y
2O
3Sand, temperature are 20-25 ℃, and is dry more than 8 hours in the environment of humidity 30-70%, forms surface layer; Adopt 200-400 purpose Al
2O
3It is the 10-30 slip of second that powder and Ludox are configured to flow cup viscosity by weight 3:1～4:1, is coated with the 2nd layer, spreads the electric smelting Al of 40-80 order granularity
2O
3Sand is 20-25 ℃ in temperature, and is dry more than 10 hours in the environment of humidity 30-60%, forms transition zone; Adopt then the bauxite slip, flow cup viscosity is 10-20 second, and the stucco granularity is 16-24 purpose bastard coal stone sand, is coated with 3～5 layers, and every layer is 20-25 ℃ in temperature all, and is dry more than 12 hours in the environment of humidity 30-60%, forms back-up coat; Last one deck is coated with the bauxite slip, is 20-25 ℃ in temperature, and is dry more than 10 hours in the environment of humidity 30-60%.
5, according to the formwork preparation method of the described model casting TiAl base of claim 4 alloy, it is characterized in that: described back-up coat and last slip all are that 200-400 order bauxite powder and Ludox form by weight 3:1～4:1 configuration.
6, according to the formwork preparation method of the described model casting TiAl base of claim 1 alloy, it is characterized in that: described Y
2O
3Powder is sintered state, Y
2O
3Sand is the electric smelting attitude.
7, according to the formwork preparation method of the described model casting TiAl of claim 1 base alloy, it is characterized in that: described step 3), the formwork that the dewaxing back forms carries out sintering again after room temperature is placed 4-10 hour, the temperature of sintering is at 800-1200 ℃, be incubated 1-3 hour, stove is chilled to below 300 ℃ and can takes out.
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|---|---|---|---|
| CN2007101590434A CN101462150B (en) | 2007-12-19 | 2007-12-19 | Method for preparing TiAl-based alloy formwork by wax mold casting |
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|---|---|---|---|
| CN2007101590434A CN101462150B (en) | 2007-12-19 | 2007-12-19 | Method for preparing TiAl-based alloy formwork by wax mold casting |
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| CN101462150B CN101462150B (en) | 2011-07-20 |
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| CN102294436A (en) * | 2011-09-19 | 2011-12-28 | 哈尔滨实钛新材料科技发展有限公司 | Method for precisely casting titanium alloy and titanium aluminum alloy with low cost |
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| CN102601307A (en) * | 2012-04-13 | 2012-07-25 | 北京工业大学 | Preparation method of shell mold for investment casting of TiAl based alloy |
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