US20070181285A1 - Die for producing a casting and method for making the die - Google Patents
Die for producing a casting and method for making the die Download PDFInfo
- Publication number
- US20070181285A1 US20070181285A1 US11/670,489 US67048907A US2007181285A1 US 20070181285 A1 US20070181285 A1 US 20070181285A1 US 67048907 A US67048907 A US 67048907A US 2007181285 A1 US2007181285 A1 US 2007181285A1
- Authority
- US
- United States
- Prior art keywords
- layer area
- casting mould
- casting
- minimum
- front layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000005266 casting Methods 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 35
- 229910052751 metal Inorganic materials 0.000 claims abstract description 34
- 239000002184 metal Substances 0.000 claims abstract description 34
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 21
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims abstract description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000010936 titanium Substances 0.000 claims abstract description 7
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 6
- 150000002739 metals Chemical class 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 230000003019 stabilising effect Effects 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 33
- 239000002002 slurry Substances 0.000 claims description 33
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 16
- 239000004576 sand Substances 0.000 claims description 13
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical group O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 10
- 229910052681 coesite Inorganic materials 0.000 claims description 10
- 229910052906 cristobalite Inorganic materials 0.000 claims description 10
- 238000007598 dipping method Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- 229910052682 stishovite Inorganic materials 0.000 claims description 10
- 229910052905 tridymite Inorganic materials 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 229910010038 TiAl Inorganic materials 0.000 claims description 5
- 238000010304 firing Methods 0.000 claims description 4
- 238000009877 rendering Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 3
- 229910000765 intermetallic Inorganic materials 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 2
- 229910000943 NiAl Inorganic materials 0.000 claims description 2
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 239000000919 ceramic Substances 0.000 description 21
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 6
- 238000005495 investment casting Methods 0.000 description 6
- 239000002518 antifoaming agent Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 239000000080 wetting agent Substances 0.000 description 4
- 229910052593 corundum Inorganic materials 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 239000011858 nanopowder Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910021324 titanium aluminide Inorganic materials 0.000 description 2
- 238000004018 waxing Methods 0.000 description 2
- 229910006281 γ-TiAl Inorganic materials 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- OQPDWFJSZHWILH-UHFFFAOYSA-N [Al].[Al].[Al].[Ti] Chemical compound [Al].[Al].[Al].[Ti] OQPDWFJSZHWILH-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 230000004520 agglutination Effects 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 238000009750 centrifugal casting Methods 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- -1 liquefiers Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229910000907 nickel aluminide Inorganic materials 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
Definitions
- the invention concerns a die for producing a casting, particularly a component for a motor or other engine, from a reactive non-ferrous molten metal charge using a casting mould, and a method for manufacturing the die and the use of the die to produce a component.
- casting moulds includes their employment for producing castings of the widest range of types.
- a molten charge of a casting material is introduced into a cavity of the casting mould.
- the casting material then solidifies, giving the casting an external shape which corresponds to that of the casting mould.
- the casting is subsequently removed from the casting mould.
- thin-walled casting moulds known as ceramic shell moulds in the lost wax casting process, are frequently used.
- ⁇ -titanium aluminides ⁇ -TiAl
- nickel aluminides nickel-based alloys
- TiAl alloys are distinguished by better creep properties and lower susceptibility to oxidation.
- DE 103 46 953 A1 discloses a die for producing castings and a process for manufacturing the die.
- the known casting mould is particularly suitable for handling TiAl alloys.
- the casting mould is manufactured using the slurry dipping and sand coating process.
- a wax blank in the shape of the casting to be made is prepared, repeatedly coated with a slurry, sand coated and then dried and cured. Finally, the wax blank is removed from the casting mould thus formed.
- a slurry consisting of water, yttrium oxide, magnesium oxide and calcium oxide is used to produce the known casting mould. In this way, a casting mould is obtained in which at least one surface coming into contact with the reactive non-ferrous molten charge consists of yttrium oxide, magnesium oxide and calcium oxide.
- the antifoaming agent is primarily intended to prevent bubbles from forming on the surface of the slurry, which could cause defects in the production of the casting mould. Acids and bases can also be added. Complicated, time-consuming tests are usually necessary to create a slurry system suitable for the purposes of specific applications.
- Casting moulds/ceramic shell moulds for handling intermetallic compounds, particularly those of reactive TiAl alloys, are known in which the surfaces of the casting mould/ceramic shell mould facing the front are made of AI 2 O 3 /Y 2 O 3 (G. W. Dickhues: Feingusstechnologie für intermetallische ⁇ -TiAI-Legtechniken [Lost wax casting for intermetallic ⁇ -TiAl alloys], Erasmus 5 [Series 5]: Grund- und Maschinenstoffe [Primary matter and materials], no. 369, VDI-Verlag GmbH, 1994).
- the casting moulds known as ceramic shell moulds based on the Al 2 O 3 /Y 2 O 3 or Al 2 O 3 system are also made by dipping and sand coating within the scope of the known dipping process.
- Dickhues represents an attempt to produce SiO 2 -free ceramic shell moulds, as earlier lost wax casting methods used slurries which contained not only various ceramic filler systems but also primarily binders in the form of aqueous or alcoholic SiO 2 dispersions (silicic acid brine or ethyl silicate).
- SiO 2 can be reduced by reactive molten charges, such as alloys based on TiAl or NiAl in ceramic shell moulds containing SiO 2 .
- the consequence is considerable oxygen absorption by the molten charge, which may entail drastic losses of strength by the material.
- the interaction between the molten charge and the ceramic shell mould may entail pronounced erosion, which may cause the ceramic shell mould/casting mould to be destroyed, the molten charge to absorb ceramic particles and/or poor surface quality of the casting.
- Dickhues uses acrylic acid ester as a binder for the slurry for the front layers of the casting mould.
- the purpose of the invention is to create a die for producing a casting from a reactive molten charge using a casting mould and a method for manufacturing the die which facilitates reliable, reproducible production of the casting mould.
- independent claim 26 refers to the use of a die to cast a casting.
- a die is made for producing a casting; particularly a component for a motor or other engine, from a reactive non-ferrous molten metal charge using a casting mould; which die has a front layer area which comes into contact with the reactive non-ferrous molten metal charge and a back-up layer area mechanically stabilising the front layer area, the front layer area consisting of a minimum of one rare earth oxide and a minimum of one additional metal oxide, the minimum of one additional metal oxide being selected from the group of oxides of the following metals: titanium and nickel.
- a method for manufacturing a die for the production of a casting, particularly a motor or other engine component, from a reactive non-ferrous molten metal charge includes the following steps: providing of a wax blank with an external shape which reproduces the casting to be made; formation of a casting mould which has a front layer area which comes into contact with the reactive non-ferrous molten metal charge and a back-up layer area mechanically stabilising the front layer area, the wax blank being coated at least once with a slurry; drying and curing the casting mould; removal of the wax blank from the casting mould and firing of the casting mould; the front layer area of the casting mould being formed as a layer consisting of a minimum of one rare earth oxide and a minimum of one additional metal oxide, the minimum of one additional metal oxide being selected from the group of oxides of the following metals: titanium and nickel.
- the particular advantage over the state of the art is that the sintering temperature for the front layer area is reduced and thus achieves improved fusion and ultimately improved physical properties.
- a purposeful embodiment of the invention anticipates the minimum of one rare earth oxide being yttrium oxide.
- a metal oxide which is an oxide from the same metal comprised in the reactive non-ferrous molten metal charge to be used in the casting mould.
- Such metal oxide may therefore be referred to as a metal oxide of the same species, namely the same metal.
- a possible contamination of the non-ferrous molten metal charge by external or parasitic elements can be minimized or even completely avoided.
- positive effect refers also to the casting produced using the die. The generation of undesired phases in the casting is avoided.
- exactly one metal oxide of the same species is used in the front layer area.
- a titanium oxide is used in the front layer area of the casting mould.
- a nickel oxide in case of a reactive non-ferrous molten metal charge based on a nickel alloy.
- a purposeful embodiment of the invention anticipates the yttrium oxide having purity in excess of 99.9%, avoiding problems which could occur due to the presence of impurities in the front layer area.
- a purposeful further development of the invention may provide for the ratio by weight between the minimum of one rare earth oxide and the minimum of one metal oxide exceeding 10:1.
- the front layer area and/or the back-up layer area are purposefully produced by the slurry dipping and sand coating process.
- This method has the advantage over other methods for manufacturing casting moulds/ceramic shell moulds that even contours with the small dimensions of the wax blank casting reproducing the casting to be produced are coated reliably.
- an advantageous further development of the invention provides for the casting mould in which the front layer area which comes into contact with the reactive non-ferrous molten metal charge contains less than 0.1% SiO 2 by weight. This avoids unwanted reactions between the material of the front layer area and the molten charge.
- a preferred embodiment of the invention anticipates that the casting mould in the front layer area and the back-up layer area is openly porous, rendering the casting form gas-permeable.
- a preferred embodiment of the invention provides for the casting mould in the back-up layer area having pores making up a volumetric proportion of between 20% and 40%.
- a purposeful further development of the invention may provide for the casting mould having a surface roughness (Ra) better than 3.2 ⁇ m.
- Such high-quality surfaces are particularly advantageous to fluidic applications in motor and other engine components.
- Such an advantageous embodiment provides for the casting mould having a strength in excess of 13 MPa.
- Such casting mould strengths are particularly suitable for centrifugal casting.
- back-up layer area is formed in various grain sizes, using aluminium oxide.
- a purposeful further development of the invention anticipates the back-up area being produced using a minimum of one slurry containing an aqueous binder with an SiO 2 content. In this way, the stronger binding effect of SiO 2 , which leads to increased strengths of the back-up layer and thus of the entire casting mould, can be used.
- a further reduction in the sintering temperature is achieved by forming the front layer area by using a very fine-grained powder, particularly a powder consisting of nanoparticles, such as yttrium oxide nanopowder. It is known that the sintering temperature of nanopowders is up to several hundred K below the sintering temperature of microscale powders.
- One embodiment of the invention provides using a mixture of the minimum of one rare earth oxide and oxides of the metals which principally occur in the molten charge, e.g. TiO 2 in the case of titanium alloys.
- the die with the casting mould can be used to cast a casting by introducing a non-ferrous molten metal charge into the casting mould, cooling and solidifying the non-ferrous molten metal charge in the casting mould so that a casting is formed, and removing the casting from the casting mould.
- the dependent claims for the method for manufacturing the die for producing a casting show advantages named in connection with the relevant properties in the dependent claims for the die for producing a casting.
- At least two different slurries are used: one to produce a front layer (FS) area facing a later casting and another to create a mechanically-stabilising back-up layer area (BS).
- the sand coating materials are adapted to the slurry.
- the ceramic components of the slurry made from an aqueous solution for the front-layer area are Y 2 O 3 powder with grain sizes between 1 ⁇ m and 50 ⁇ m and purity better than 99.9% and TiO 2 with a grain size of less than 10 ⁇ m.
- the aggregate proportion of ceramic substances is greater than 80% by weight.
- the ratio of the proportions (Y 2 O 3 /TiO 2 ) is greater than 10:1.
- the residual proportions of the slurry are water, a water-soluble SiO 2 -free binder and discretionary further additives usual in lost wax casting such as liquefiers, wetting agents and/or antifoaming agents.
- the slurry is a mixture of the different components.
- a further slurry is used for the back-up layer area, with a solid content of approximately 60%, consisting of aluminium oxide powder mixed with powders with three different grain sizes.
- Other constituents are an aqueous binder containing SiO 2 on a basis of silicic acid, water, wetting agent and antifoaming agent.
- a wax blank the external shape of which corresponds to an article to be produced later with the casting mould, is dipped in the slurry for the front layer to form the front layer area. After the slurry has drained, the dipped wax blank is sand-coated with Y 2 O 3 powders with purity better than 99.9% and a grain diameter from 50-250 ⁇ m. A low fine-grain proportion is advantageous. These stages in the process are repeated several times with interim drying of the layers until the desired front layer thickness has been obtained.
- the wax blank bearing the formed front layer area is dipped in the additional slurry for the back-up layer area. It is subsequently dried and sand coated with a mixture of commercial
- Al 2 O 3 powders with three different grain sizes from 10-250 ⁇ m are also repeated several times with interim drying of the layers until the desired back-up layer area thickness has been obtained.
- the final drying of the green form takes place for about 48 hours at room temperature following the final immersion in the additional slurry for the back-up layer area.
- Superheated steam in a steam autoclave is used for subsequent de-waxing of the wax blank from the green form.
- the de-waxed casting mould/ceramic shell mould is fired in air using a specified temperature gradient.
- the time curve is particularly characterized by a specified heating rate, at least one arrest point at a specific temperature below 800° C. and a maximum temperature below 1600° C. Cooling takes place slowly in a switched-off kiln. Cleaning of the ceramic shell mould follows, before it can be used for casting.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102006005057A DE102006005057A1 (de) | 2006-02-03 | 2006-02-03 | Werkzeug zum Herstellen eines Gußteils und Verfahren zum Herstellen des Werkzeugs |
| DE102006005057.6 | 2006-02-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20070181285A1 true US20070181285A1 (en) | 2007-08-09 |
Family
ID=37897761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US11/670,489 Abandoned US20070181285A1 (en) | 2006-02-03 | 2007-02-02 | Die for producing a casting and method for making the die |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20070181285A1 (de) |
| EP (1) | EP1826192A1 (de) |
| DE (1) | DE102006005057A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020108196B4 (de) | 2020-03-25 | 2024-05-16 | Technische Universität Bergakademie Freiberg | Verfahren zur Herstellung einer keramischen, silikatfreien Feingussform für die Herstellung von Feingussteilen aus höherschmelzenden Metallen und Verwendung einer keramischen, silikatfreien Feingussform für die Herstellung von Feingussteilen aus höherschmelzenden Metallen |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4040845A (en) * | 1976-03-04 | 1977-08-09 | The Garrett Corporation | Ceramic composition and crucibles and molds formed therefrom |
| US4131475A (en) * | 1975-06-27 | 1978-12-26 | General Electric Company | Fabrication of shell investment molds |
| US5492957A (en) * | 1991-04-04 | 1996-02-20 | Shin-Etsu Chemical Co., Ltd. | Face coat composition for casting mold and method for the preparation of casting mold having face coat layer |
| US5508242A (en) * | 1990-05-11 | 1996-04-16 | Rhone-Poulenc Chimie | Yttrium oxide/titanium oxide ceramic compositions |
| US7229600B2 (en) * | 2003-01-31 | 2007-06-12 | Nanoproducts Corporation | Nanoparticles of rare earth oxides |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3683086D1 (de) * | 1985-06-06 | 1992-02-06 | Remet Corp | Giessen von reaktionsfaehigen metallen in keramische formen. |
| US4703806A (en) * | 1986-07-11 | 1987-11-03 | Howmet Turbine Components Corporation | Ceramic shell mold facecoat and core coating systems for investment casting of reactive metals |
| US5407001A (en) * | 1993-07-08 | 1995-04-18 | Precision Castparts Corporation | Yttria-zirconia slurries and mold facecoats for casting reactive metals |
| US5643844A (en) * | 1994-09-27 | 1997-07-01 | Precision Castparts Corporation | Method for stabilizing ceramic suspensions |
| AT406673B (de) * | 1998-03-04 | 2000-07-25 | Treibacher Auermet Prod Gmbh | Verwendung von metalloxiden zur bereitung keramischer formmassen |
| DE10346953A1 (de) * | 2003-10-09 | 2005-05-04 | Mtu Aero Engines Gmbh | Werkzeug zum Herstellen von Gussbauteilen, Verfahren zum Herstellen des Werkzeugs und Verfahren zum Herstellen von Gussbauteilen |
-
2006
- 2006-02-03 DE DE102006005057A patent/DE102006005057A1/de not_active Withdrawn
-
2007
- 2007-01-30 EP EP07001949A patent/EP1826192A1/de not_active Withdrawn
- 2007-02-02 US US11/670,489 patent/US20070181285A1/en not_active Abandoned
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4131475A (en) * | 1975-06-27 | 1978-12-26 | General Electric Company | Fabrication of shell investment molds |
| US4040845A (en) * | 1976-03-04 | 1977-08-09 | The Garrett Corporation | Ceramic composition and crucibles and molds formed therefrom |
| US5508242A (en) * | 1990-05-11 | 1996-04-16 | Rhone-Poulenc Chimie | Yttrium oxide/titanium oxide ceramic compositions |
| US5492957A (en) * | 1991-04-04 | 1996-02-20 | Shin-Etsu Chemical Co., Ltd. | Face coat composition for casting mold and method for the preparation of casting mold having face coat layer |
| US7229600B2 (en) * | 2003-01-31 | 2007-06-12 | Nanoproducts Corporation | Nanoparticles of rare earth oxides |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102006005057A1 (de) | 2007-08-16 |
| EP1826192A1 (de) | 2007-08-29 |
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