WO1998032557A9 - INTEGRATED CRUCIBLE AND MOLD FOR LOW COST η-TiAl CASTINGS - Google Patents
INTEGRATED CRUCIBLE AND MOLD FOR LOW COST η-TiAl CASTINGSInfo
- Publication number
- WO1998032557A9 WO1998032557A9 PCT/US1998/001672 US9801672W WO9832557A9 WO 1998032557 A9 WO1998032557 A9 WO 1998032557A9 US 9801672 W US9801672 W US 9801672W WO 9832557 A9 WO9832557 A9 WO 9832557A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pattern
- sleeve
- crucible
- shell
- mold
- Prior art date
Links
- 229910010038 TiAl Inorganic materials 0.000 title description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 20
- 239000010439 graphite Substances 0.000 claims abstract description 20
- 238000005266 casting Methods 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 18
- 239000000919 ceramic Substances 0.000 claims abstract description 11
- 230000023298 conjugation with cellular fusion Effects 0.000 claims abstract description 8
- 230000013011 mating Effects 0.000 claims abstract description 8
- 150000002739 metals Chemical class 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims abstract description 8
- 230000021037 unidirectional conjugation Effects 0.000 claims abstract description 8
- 238000010304 firing Methods 0.000 claims abstract description 5
- RUDFQVOCFDJEEF-UHFFFAOYSA-N oxygen(2-);yttrium(3+) Chemical compound [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 claims description 12
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium monoxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 10
- 235000012255 calcium oxide Nutrition 0.000 claims description 9
- 239000000292 calcium oxide Substances 0.000 claims description 9
- 239000004793 Polystyrene Substances 0.000 claims description 6
- 229920002223 polystyrene Polymers 0.000 claims description 6
- 238000007598 dipping method Methods 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N AI2O3 Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000001590 oxidative Effects 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N silicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- 229910006281 γ-TiAl Inorganic materials 0.000 description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 8
- 229910052719 titanium Inorganic materials 0.000 description 8
- 239000010936 titanium Substances 0.000 description 8
- 229910021324 titanium aluminide Inorganic materials 0.000 description 6
- 238000002844 melting Methods 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000011109 contamination Methods 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- GFQYVLUOOAAOGM-UHFFFAOYSA-N Zirconium(IV) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910000601 superalloy Inorganic materials 0.000 description 2
- ZCUFMDLYAMJYST-UHFFFAOYSA-N thorium dioxide Chemical compound O=[Th]=O ZCUFMDLYAMJYST-UHFFFAOYSA-N 0.000 description 2
- 229910052845 zircon Inorganic materials 0.000 description 2
- 229910052846 zircon Inorganic materials 0.000 description 2
- 229910000951 Aluminide Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 229910001093 Zr alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000002939 deleterious Effects 0.000 description 1
- -1 for example Inorganic materials 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 229910052904 quartz Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000002285 radioactive Effects 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
Definitions
- the present invention relates generally to crucibles for casting. More particularly, the present invention provides a one piece integrated crucible and invested mold for use in the casting of reactive metals, particularly complex shapes thereof.
- zircon, or silicates which are typically used in casting metals such as iron, nickel or
- Turbocharger rotors are typically cast using nickel superalloy which can be easily melted and cast using invested mold having a zircon facecoat and an alumina-silicate crucible attached to the top of the mold.
- Candidate crucible materials include yttria (Y 2 O ), thoria (Th ⁇ 2), calcia (CaO) and other exotic rare earth oxides. Thoria is radioactive and suffers from poor thermal shock resistance. For this reason it has not been exploited industrially. However,
- yttria crucibles are very expensive, $50 to $100
- the alumina-silicate crucibles used for nickel superalloy castings are less than $1. Since titanium and titanium aluminide castings compete with nickel castings in a wide variety of applications, the high cost of yttria crucibles effectively prices titanium and titanium aluminide castings out of
- Calcia is also a potential refractory material for titanium and titanium
- the invention would also find application for other reactive metal castings, for example zirconium alloy castings. It is also desirable to provide a low cost, industrially practical one piece crucible and investment mold for casting reactive and non-reactive metals. It is further desirable to provide a graphite or other inductively suscepting
- the present invention provides a graphite crucible attached directly to the top of an invested mold in the shape of the complex molded part, a turbocharger rotor for the
- a method for producing the integrated crucible and mold is characterized by the steps of attaching
- the mold shell around the pattern and a mating portion of the crucible.
- the mold shell is created by dipping the pattern and crucible mating portion in an inert ceramic facecoat slurry, allowing the dipcoat layer to partially dry and/or cure, applying a layer of ceramic stucco over the dipcoat and laminating additional layers of dipcoat and stucco
- the embodiment of the invention described in detail subsequently, provides a one piece crucible/mold system suitable for casting a metal part in vacuum at temperatures exceeding 1400°C.
- Carbon is a known contaminant of ⁇ -
- FIG. 1 is a section elevation view of the integrated graphite crucible and invested mold
- FIG. 2 is a pictorial view of an exemplary turbocharger rotor manufacturable from ⁇ -TiAl using the present invention.
- the integral crucible and mold includes a cylindrical graphite sleeve 10 having a bottom 12
- the sleeve is sized to accommodate a desired meltstock billet 17.
- An investment shell 18 is constituted by laminations of a facecoat slurry 20 and ceramic stucco 22 (shown only over a portion of the section for clarity), which extend over and adhere to a bottom mating portion of the graphite sleeve. After firing, which results in vaporization of the pattern, the hardened shell laminate is fixedly attached to the graphite sleeve forming an integral crucible and mold for casting of the desired part. .
- An aperture 24 in the bottom face of the sleeve provides a flow path for the molten casting metal into the mold shell while the rim 26 retains the meltstock billet in the crucible in a position for induction heating.
- a method for creating and employing the apparatus of the present invention includes the steps of attaching the polystyrene turbocharger wheel pattern to the cylindrical graphite sleeve by dipping the top of the polystyrene pattern in hot wax and inserting it into the recess in the bottom of the graphite sleeve.
- An investment shell is next built around the polystyrene pattern and the lower portion of the sleeve.
- the investment mold process begins with dipping the pattern made of wax or plastic having the shape of the desired casting in a facecoat slurry made from any ceramic inert to ⁇ -TiAl, for example, yttria or calcia.
- the crucible/invested mold assembly is then transferred while still hot from the furnace and placed in a casting chamber and evacuated.
- a cylindrical meltstock billet of the casting metal is inserted in the crucible.
- the metal is next rapidly melted by inductively heating the graphite crucible. Since graphite is a strong susceptor, the crucible is quickly heated to the melting temperature of the ⁇ -TiAl.
- the molten metal falls directly into the attached invested mold with the assistance of gravity with a minimum of superheat and hold time.
- the short hold time and low superheat prevents significant contamination by carbon from the crucible.
- the short drop distance attained as a result of the one piece design of the crucible/investment mold, allows full fill in thin sections. Greater drop distances, as would be required by two piece
- a turbocharger rotor pattern made polystyrene plastic was fitted to a recess in the bottom of a graphite crucible using wax to join the pattern to the crucible.
- the plastic was dipped in the facecoat slurry made from a yttria facecoat inert to ⁇ -TiAl.
- the graphite crucible/invested turbocharger mold assembly was then transferred while still hot from the furnace, charged with the casting metal meltstock billet, placed under a quartz bell jar and evacuated.
Abstract
An integral crucible for casting of reactive metals incorporates a graphite sleeve (10) adapted for attachment of an investment pattern (14) over which a laminate of alternating layers of facecoat slurry (20) and ceramic stucco (22) are applied to form an investment shell. The layers of the laminate extend over a mating portion of the sleeve and firing of the shell vaporizes the investment pattern leaving the sleeve and shell an integral crucible.
Description
INTEGRATED CRUCIBLE AND MOLD FOR LOW COST γ -TiAl CASTINGS
CROSS REFERENCE TO RELATED APPLICATIONS This application claims the benefit of the filing date of provisional application
60/036,041 having a filing date of January 27, 1997 entitled Integrated Crucible and
Mold For Low Cost γ -TiAl Castings.
BACKGROUND OF THE INVENTION
Field of the Invention: The present invention relates generally to crucibles for casting. More particularly, the present invention provides a one piece integrated crucible and invested mold for use in the casting of reactive metals, particularly complex shapes thereof.
Description of the Related Art: Melting and casting of reactive metals such as titanium or titanium aluminides is difficult due to the molten metals reactivity with crucibles comprising of alumina,
zircon, or silicates which are typically used in casting metals such as iron, nickel or
aluminum. Turbocharger rotors are typically cast using nickel superalloy which can be easily melted and cast using invested mold having a zircon facecoat and an alumina-silicate crucible attached to the top of the mold. Molten titanium aluminide
will rapidly react with the alumina-silicate crucible making casting impossible.
Candidate crucible materials include yttria (Y2O ), thoria (Thθ2), calcia (CaO) and other exotic rare earth oxides. Thoria is radioactive and suffers from poor thermal shock resistance. For this reason it has not been exploited industrially. However,
yttria crucibles are very expensive, $50 to $100 The alumina-silicate crucibles used
for nickel superalloy castings are less than $1. Since titanium and titanium aluminide castings compete with nickel castings in a wide variety of applications, the high cost of yttria crucibles effectively prices titanium and titanium aluminide castings out of
the market. This is particularly important for cost sensitive applications, for example automotive applications.
Calcia is also a potential refractory material for titanium and titanium
aluminides due to its thermal stability. US Patent No. 4,710,481 to Degawa et. al. discloses melting titanium and titanium alloys in calcia crucibles. However, calcia is highly hydrophilic and spontaneously hydrates in ambient levels of atmospheric moisture. The hydration is accompanied by volume changes which cause cracking and spallation. Calcia crucibles can spontaneously crack after only hours of exposure to atmospheric moisture. For this reason calcia is an impractical material for a crucible in commercial, industrial environments.
It is therefore desirable to provide a industrially practical, low molds for the casting of titanium and titanium aluminide metals which overcome the above-
mentioned drawbacks. The invention would also find application for other reactive metal castings, for example zirconium alloy castings. It is also desirable to provide a low cost, industrially practical one piece crucible and investment mold for casting reactive and non-reactive metals. It is further desirable to provide a graphite or other inductively suscepting
composite crucible containing graphite which is directly attached to an invested mold
for the casting of γ-TiAl components and, specifically, to provide a method for
producing low cost investment castings of γ-TiAl turbocharger rotors.
SUMMARY OF THE INVENTION
To overcome the limitation of the prior art and obtain the desired qualities, the present invention provides a graphite crucible attached directly to the top of an invested mold in the shape of the complex molded part, a turbocharger rotor for the
specific embodiments disclosed herein, to form an integrated unit. A method for producing the integrated crucible and mold is characterized by the steps of attaching
an investment pattern to a cylindrical graphite crucible and building an investment
mold shell around the pattern and a mating portion of the crucible. The mold shell is created by dipping the pattern and crucible mating portion in an inert ceramic facecoat slurry, allowing the dipcoat layer to partially dry and/or cure, applying a layer of ceramic stucco over the dipcoat and laminating additional layers of dipcoat and stucco
to achieve the desired thickness mold shell.
The embodiment of the invention described in detail subsequently, provides a one piece crucible/mold system suitable for casting a metal part in vacuum at temperatures exceeding 1400°C.
The method of employing the apparatus of the invention for casting of
complex components takes advantage of the rapid melting and casting of the γ-TiAl to
avoid carbon contamination from the crucible. Carbon is a known contaminant of γ-
TiAl. At low levels, i.e. under 2000 ppm (wt%) it is often added to improve creep
properties of γ-TiAl. However, at higher levels it strongly reduces the tensile ductility
of γ-TiAl. The one piece graphite crucible/investment mold prevents the deleterious
contamination of γ-TiAl by the crucible since the design allows for rapid melt times
and low superheats, both of which minimize the potential for carbon contamination.
BRIEF DESCRIPTION OF THE DRAWINGS
The details and features of the present invention will be more clearly understood with respect to the detailed description and drawings in which:
FIG. 1 is a section elevation view of the integrated graphite crucible and invested mold; and
FIG. 2 is a pictorial view of an exemplary turbocharger rotor manufacturable from γ-TiAl using the present invention.
DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention is shown in FIG. 1. The integral crucible and mold includes a cylindrical graphite sleeve 10 having a bottom 12
adapted to accommodate attachment of a polystyrene invested mold pattern 14 having an attachment runner 15. In the embodiment shown, the attachment runner is sealingly attached to the sleeve with wax 16. The sleeve is sized to accommodate a desired meltstock billet 17. An investment shell 18 is constituted by laminations of a facecoat slurry 20 and ceramic stucco 22 (shown only over a portion of the section for clarity), which extend over and adhere to a bottom mating portion of the graphite sleeve. After firing, which results in vaporization of the pattern, the hardened shell laminate is fixedly attached to the graphite sleeve forming an integral crucible and mold for casting of the desired part. . An aperture 24 in the bottom face of the sleeve provides a flow path for the molten casting metal into the mold shell while the rim 26 retains the meltstock billet in the crucible in a position for induction heating.
A method for creating and employing the apparatus of the present invention includes the steps of attaching the polystyrene turbocharger wheel pattern to the cylindrical graphite sleeve by dipping the top of the polystyrene pattern in hot wax and
inserting it into the recess in the bottom of the graphite sleeve. An investment shell is next built around the polystyrene pattern and the lower portion of the sleeve. As embodied herein, the investment mold process begins with dipping the pattern made of wax or plastic having the shape of the desired casting in a facecoat slurry made from any ceramic inert to γ-TiAl, for example, yttria or calcia. An appropriate slurry for creating a calcia facecoat is disclosed in copending application serial number 08/644,598 entitled Inert Calcia Facecoats for Investment Casting of Titanium and Titanium- Aluminide Alloys having a common assignee with the present application, the disclosure of which is incorporated herein in its entirety by reference. After allowing the dipcoat layer to partially dry and/or cure, alternate layers of ceramic stucco and dipcoat are applied on both the pattern and the lower area of the crucible until a shell of desired thickness is formed. The crucible/invested mold is allowed to dry thoroughly, and then is fired at temperatures near 1000°C for a period of no less than 0.5 hour in an oxidizing atmosphere such as air. The firing results in the complete volatilization of the pattern in a manner familiar to those skilled in the "lost wax" art.
The crucible/invested mold assembly is then transferred while still hot from the furnace and placed in a casting chamber and evacuated. A cylindrical meltstock billet of the casting metal is inserted in the crucible. The metal is next rapidly melted by inductively heating the graphite crucible. Since graphite is a strong susceptor, the crucible is quickly heated to the melting temperature of the γ-TiAl. The molten metal falls directly into the attached invested mold with the assistance of gravity with a minimum of superheat and hold time. The short hold time and low superheat prevents
significant contamination by carbon from the crucible. The short drop distance, attained as a result of the one piece design of the crucible/investment mold, allows full fill in thin sections. Greater drop distances, as would be required by two piece
crucible/investment mold systems result in poor fill due to cooling and premature
solidification in the fill tube area. After cooling, the cast metal, now in the shape of the original pattern is removed from the pattern. An exemplary
EXAMPLE I
A turbocharger rotor pattern made polystyrene plastic was fitted to a recess in the bottom of a graphite crucible using wax to join the pattern to the crucible. The plastic was dipped in the facecoat slurry made from a yttria facecoat inert to γ-TiAl.
After allowing the dipcoat layer to partially dry and/or cure, alternate layers of ceramic
stucco and dipcoat were applied on both the pattern and the lower area of the graphite crucible until a shell of desired thickness was formed. It was subsequently redipped multiple times into backup coatings of flintgrains and alumina silicate powders to form an integrated investment mold, shown schematically in Figure 1. The
crucible/invested mold containing the plastic turbocharger pattern was allowed to dry
thoroughly, and then was fired at temperatures near 1000°C for a period of 0.5 hour
in air. The graphite crucible/invested turbocharger mold assembly was then transferred while still hot from the furnace, charged with the casting metal meltstock billet, placed under a quartz bell jar and evacuated. The graphite crucible and metal
were next heated by induction resulting in melting of the metal. A drawing of the
cast TiAl rotor made from this process is shown in figure 2.
Having now described the invention in detail as required by the patent statutes, those skilled in the art will recognize modifications and substitutions to the specific
embodiments disclosed herein. Such modifications and substitutions are within the scope and intent of the present invention as defined in the following claims.
Claims
1.. A method for producing an integral crucible and mold for casting of reactive metals comprising the steps of: attaching an investment pattern to a cylindrical graphite sleeve; forming an investment shell around the pattern and a mating portion of the sleeve; firing the shell and attached sleeve for complete cure and volatilization of the pattern.
2. A method as defined in claim 1 wherein the step of attaching the investment pattern to the sleeve comprises: dipping a mating portion of the pattern in hot wax; and inserting the mating portion of the pattern into a recess in the graphite sleeve.
3. A method as defined in claim 1 wherein the step of forming comprises: dipping the in pattern in a facecoat slurry; allowing the dipcoat layer to partially dry or cure; applying alternating layers of ceramic stucco and dipcoat on both the pattern and the mating portion of the sleeve until a shell of desired thickness is formed.
4. A method as defined in step 3 wherein the step of applying alternating layers is followed by a step of allowing the shell to dry thoroughly.
5. A method as defined in claim 1 wherein the pattern is polystyrene plastic.
6. A method as defined in claim 1 wherein the firing is accomplished at temperatures near 1000┬░C for a period of no less than 0.5 hour in an oxidizing atmosphere such as air.
7. A method as defined in claim 3 wherein following the step of applying alternating layers is followed by the step of applying at least one laminating layer of flint grains and alumina silicate powders.
8. A method as defined in claim 3 wherein the facecoat slurry forming an inert ceramic.
9. A method as defined in claim 8 wherein the inert ceramic comprises yttria.
10. A method as defined in claim 8 wherein the inert ceramic comprises calcia.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53225898A JP2001509083A (en) | 1997-01-27 | 1998-01-27 | Integrated crucible and mold for low cost γ-TiAl casting |
| BR9807084-3A BR9807084A (en) | 1997-01-27 | 1998-01-27 | Process for the production of integrated crucibles and molds for reactive metal foundries |
| DE69805164T DE69805164T2 (en) | 1997-01-27 | 1998-01-27 | METHOD FOR PRODUCING A PIG WITH AN INTEGRATED SHAPE FOR THE INEXPENSIVE PRODUCTION OF GAMMA-TIAL CASTING PARTS |
| AU65336/98A AU6533698A (en) | 1997-01-27 | 1998-01-27 | Integrated crucible and mold for low cost gamma-tial castings |
| EP98911363A EP0963262B1 (en) | 1997-01-27 | 1998-01-27 | Method for producing an integrated crucible and mold for low cost gamma-tial castings |
| AT98911363T ATE216929T1 (en) | 1997-01-27 | 1998-01-27 | METHOD FOR PRODUCING A CRUCIBLE WITH INTEGRATED MOLD FOR ECONOMIC PRODUCTION OF GAMMA-TIAL CASTINGS |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US3604197P | 1997-01-27 | 1997-01-27 | |
| US60/036,041 | 1997-01-27 | ||
| US814398A | 1998-01-16 | 1998-01-16 | |
| US09/008,143 | 1998-01-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1998032557A1 WO1998032557A1 (en) | 1998-07-30 |
| WO1998032557A9 true WO1998032557A9 (en) | 1999-02-04 |
Family
ID=26677855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1998/001672 WO1998032557A1 (en) | 1997-01-27 | 1998-01-27 | INTEGRATED CRUCIBLE AND MOLD FOR LOW COST η-TiAl CASTINGS |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0963262B1 (en) |
| JP (1) | JP2001509083A (en) |
| CN (1) | CN1101284C (en) |
| AT (1) | ATE216929T1 (en) |
| BR (1) | BR9807084A (en) |
| DE (1) | DE69805164T2 (en) |
| ES (1) | ES2176986T3 (en) |
| PT (1) | PT963262E (en) |
| WO (1) | WO1998032557A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6749006B1 (en) | 2000-10-16 | 2004-06-15 | Howmet Research Corporation | Method of making investment casting molds |
| US6663347B2 (en) * | 2001-06-06 | 2003-12-16 | Borgwarner, Inc. | Cast titanium compressor wheel |
| DE10209346B4 (en) * | 2002-03-02 | 2004-02-19 | Daimlerchrysler Ag | Manufacturing method for a multi-part valve for internal combustion engines |
| PT103018A (en) * | 2003-09-12 | 2005-03-31 | Univ Do Minho | PROCESS FOR OBTAINING FISH IN G-TIAI BY FOUNDATION |
| FR2870148B1 (en) * | 2004-05-12 | 2006-07-07 | Snecma Moteurs Sa | LOST WAX FOUNDRY PROCESS WITH CONTACT LAYER |
| FR2870147B1 (en) * | 2004-05-12 | 2007-09-14 | Snecma Moteurs Sa | LOST WAX FOUNDRY PROCESS |
| US7258158B2 (en) | 2004-07-28 | 2007-08-21 | Howmet Corporation | Increasing stability of silica-bearing material |
| US8048365B2 (en) * | 2007-04-30 | 2011-11-01 | General Electric Company | Crucibles for melting titanium alloys |
| DE102009018801A1 (en) | 2009-04-24 | 2009-11-05 | Daimler Ag | Turbocharger arrangement has turbocharger shaft and turbocharger wheel, where turbocharger shaft with turbocharger wheel is made in single piece from material from group comprising metal matrix and ceramic matrix composites |
| CN101875106B (en) * | 2009-11-20 | 2011-12-28 | 北京科技大学 | Preparation method of directional solidification high-niobium TiAl-base alloy |
| CN101984321B (en) * | 2010-11-23 | 2012-05-23 | 北京科技大学 | Method for fabricating crucible pattern die for directional solidification of titanium aluminum alloy |
| US8858697B2 (en) | 2011-10-28 | 2014-10-14 | General Electric Company | Mold compositions |
| CN102527936B (en) * | 2012-01-19 | 2013-04-10 | 沈阳铸造研究所 | Graphite mould casting method for precise forming of low expansion alloy |
| US9011205B2 (en) | 2012-02-15 | 2015-04-21 | General Electric Company | Titanium aluminide article with improved surface finish |
| US8932518B2 (en) | 2012-02-29 | 2015-01-13 | General Electric Company | Mold and facecoat compositions |
| US8906292B2 (en) | 2012-07-27 | 2014-12-09 | General Electric Company | Crucible and facecoat compositions |
| US8708033B2 (en) | 2012-08-29 | 2014-04-29 | General Electric Company | Calcium titanate containing mold compositions and methods for casting titanium and titanium aluminide alloys |
| US8992824B2 (en) | 2012-12-04 | 2015-03-31 | General Electric Company | Crucible and extrinsic facecoat compositions |
| US9592548B2 (en) | 2013-01-29 | 2017-03-14 | General Electric Company | Calcium hexaluminate-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys |
| US9511417B2 (en) | 2013-11-26 | 2016-12-06 | General Electric Company | Silicon carbide-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys |
| US9192983B2 (en) | 2013-11-26 | 2015-11-24 | General Electric Company | Silicon carbide-containing mold and facecoat compositions and methods for casting titanium and titanium aluminide alloys |
| US10391547B2 (en) | 2014-06-04 | 2019-08-27 | General Electric Company | Casting mold of grading with silicon carbide |
| DE102018109322A1 (en) * | 2018-04-19 | 2019-10-24 | Engel Austria Gmbh | Melting unit for a molding machine and molding machine |
| CN112108641A (en) * | 2019-06-19 | 2020-12-22 | 中冶宝钢技术服务有限公司 | Mold core positioning method for integral pouring of tundish refractory lining |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01157759A (en) * | 1987-07-25 | 1989-06-21 | Asahi Roentgen Kogyo Kk | Method and device for precisely casting titanium or titanium alloy |
-
1998
- 1998-01-27 PT PT98911363T patent/PT963262E/en unknown
- 1998-01-27 ES ES98911363T patent/ES2176986T3/en not_active Expired - Lifetime
- 1998-01-27 DE DE69805164T patent/DE69805164T2/en not_active Expired - Fee Related
- 1998-01-27 WO PCT/US1998/001672 patent/WO1998032557A1/en active IP Right Grant
- 1998-01-27 EP EP98911363A patent/EP0963262B1/en not_active Expired - Lifetime
- 1998-01-27 AT AT98911363T patent/ATE216929T1/en not_active IP Right Cessation
- 1998-01-27 JP JP53225898A patent/JP2001509083A/en not_active Ceased
- 1998-01-27 CN CN98802006.8A patent/CN1101284C/en not_active Expired - Fee Related
- 1998-01-27 BR BR9807084-3A patent/BR9807084A/en not_active IP Right Cessation
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