WO2010034762A2 - Procédé pour produire un moule servant à couler une masse en fusion hautement réactive - Google Patents
Procédé pour produire un moule servant à couler une masse en fusion hautement réactive Download PDFInfo
- Publication number
- WO2010034762A2 WO2010034762A2 PCT/EP2009/062355 EP2009062355W WO2010034762A2 WO 2010034762 A2 WO2010034762 A2 WO 2010034762A2 EP 2009062355 W EP2009062355 W EP 2009062355W WO 2010034762 A2 WO2010034762 A2 WO 2010034762A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- dry mass
- hydraulic binder
- powder
- casting
- Prior art date
Links
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
-
- 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
- B22C1/04—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 protection of the casting, e.g. against decarbonisation
- B22C1/06—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 protection of the casting, e.g. against decarbonisation for casting extremely oxidisable metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
Definitions
- the invention relates to a method for producing a casting mold for casting highly reactive melts, in particular for casting titanium, titanium alloys or intermetallic titanium aluminides, according to the preamble of claim 1.
- a slip for producing a contact layer or face-coat layer contains yttrium oxide, magnesium oxide and calcium oxide.
- the magnesium oxide causes together with the water of the slurry an exothermic reaction in which water evaporates and the drying time of the contact layer produced from the slip is reduced.
- About the amount or the proportions of the oxides used from this document is not known.
- the object of the present invention is to eliminate the disadvantages of the prior art.
- a method for producing a casting mold for casting highly reactive melts is to be specified, which is as simple as possible, reproducible and quick to carry out.
- a first dry mass for the preparation of the first slip at least 75 wt.% Y 2 O 3 and contains as further solid component at least 1.0 to 25 wt.% Of a hydraulic binder.
- a "hydraulic binder” is understood as meaning a substance mixture which hydrates with water. The hydration products formed in this way lead to solidification of the solid constituents contained in the first slip.
- the proposed composition a particularly rapid solidification of the first slurry can be achieved.
- the first dry mass contains less than 95% by weight of Y 2 O 3, preferably less than 90% by weight. It has surprisingly been found that the relatively expensive constituent Y 2 O 3 required for stability against corrosive attack by highly reactive melts can be reduced by the addition of a hydraulic binder without the resistance of the contact layer to the corrosive action being highly reactive Melting is reduced.
- the content of Y 2 O 3 in the first dry mass can be reduced, for example, to 80 or 85% by weight. Part of the Y 2 O 3 , for example 5 to 10 wt.%, Can be replaced by TiO 2 .
- the content of the hydraulic binder is advantageously between 8 and 16% by weight.
- the first slip can be applied to the mold core in a spraying process.
- the grain band of the first powder is between 0 to 50 microns and advantageously has a mean grain size (d 50 ) in the range of 8 to 20 microns. It has been shown that a slurry with the proposed particle size distribution on the one hand can be processed particularly well in the spray process and, on the other hand, that a high surface quality of the contact layer can be achieved.
- the second Y 2 O 3 powder may have a mean grain size (d 50 ) in the range of 130 to 200 microns.
- the proposed mean grain size of the second Y 2 O 3 powder contributes to a good flowability and thus facilitates the Besanden the contact layer.
- the hydraulic binder preferably contains CaO * Al 2 O 3 .
- Such a calcium aluminate cement expediently contains 60 to 80% by weight of Al 2 O 3 , preferably about 70% by weight of Al 2 O 3 .
- a contact layer made using the proposed hydraulic binder has excellent strength.
- the first dry mass expediently contains only unavoidable impurities of MgO. Thus, a particularly good resistance to highly reactive melts, in particular titanium aluminide melts, can be achieved.
- a cladding layer surrounding the layer sequence of contact and first sanding layer or the plurality of layer sequences is produced.
- the cladding layer may contain MgO as an essential ingredient.
- a second dry mass for producing the cladding layer may further contain a hydraulic binder, preferably calcium aluminate cement.
- a hydraulic binder preferably calcium aluminate cement.
- a second dry mass contains expediently at least 40 wt.% MgO, preferably 60 to 80 wt.%, And at least 20 wt.% Of the hydraulic binder.
- the second dry mass may contain one or more of the following oxides: Fe 2 O 3 , SiO 2 , CaO, Al 2 O 3 .
- the cladding layer essentially serves to mechanically stabilize the contact layer. It can have a considerably greater layer thickness than the contact layer.
- the intermediate layer can be produced by a second slurry applied by spraying or dipping.
- the second slip may contain as an essential solid constituent a first MgO powder.
- the second slurry may be a hydraulic binder, preferably a calcium aluminate cement (CaO * Al 2 O 3 ) containing 60 to 80 weight percent Al 2 O 3 , preferably about 70 weight percent Al 2 O 3 .
- a third dry mass for producing the second slip may contain at least 50 wt% MgO, preferably 60 to 70 wt%, and at least 20 wt% of the hydraulic binder.
- the second sanding layer is expediently produced by applying a second MgO powder to the second slip layer.
- a plurality of such interlayer sequences each of which is formed from the intermediate layer and the second sanding layer, can be applied one after the other to the layer sequence of the contact and first sanding layers.
- the first MgO powder may have a smaller average grain size than the second MgO powder.
- the first and / or the third dry mass (s) and / or the coating layer (s) may additionally contain at least one of the following oxides include: CeO 2 , La 2 O 3 , Gd 2 O 3 , Nd 2 O 3 , TiO 2 .
- the addition of other rare earth oxides is also possible.
- the interlayer sequence thus produced contributes to improved thermal shock resistance of the mold. Since the intermediate layers also contain a hydraulic binder, they too can be produced quickly and efficiently, in particular by spraying. In this case, a moisture content of the contact and / or the intermediate layer can be reduced to a predetermined value after its application by means of infrared radiation.
- the predetermined value can be in the range from 10 to 60% residual moisture, preferably less than 20% and more than 5% residual moisture.
- the proportion of the hydraulic binder in the first dry mass is smaller than in the second or third dry mass.
- the proportion of the hydraulic binder in the second and / or third dry mass is advantageously at least 2% by weight, preferably at least 5% by weight, higher than in the first dry mass.
- first and / or second slip have a viscosity of at most 1000 mPas, preferably between 450 and 750 mPas. Slips with such a viscosity can be processed particularly well by spraying.
- the mandrel is removed by melting or burning out the material forming the mandrel.
- the material is suitably wise to wax or the like.
- a formed after removal of the mandrel green body is suitably sintered at a sintering temperature of more than 800 0 C and less than 1200 0 C.
- the use according to the invention of a hydraulic binder for the production of the casting mold thus also contributes to a considerable reduction of the sintering temperatures.
- a contact layer 1 contains, for example, 85% by weight of Y 2 O 3 and 15% by weight of hydration products of the calcium aluminate cement. It is expediently free of MgO, apart from unavoidable impurities.
- the reference numeral 2 designates a first sanding layer, which consists essentially of a further Y 2 O 3 powder having an average particle size of about 150 ⁇ m. The first sanding layer 2 is expediently free of MgO, apart from unavoidable impurities.
- the contact layer 1 and the first sanding layer 2 form a layer sequence A.
- an intermediate layer 3 which contains as an essential ingredient MgO, which in turn is bonded to the reaction product of a Calciumaluminatzements.
- the reference numeral 4 designates a second sanding layer, which is made of a MgO powder.
- An intermediate layer sequence formed alternately from the intermediate layer 3 and the second sanding layer 4 is designated by the reference B.
- the interlayer sequence B is backfilled with a cladding layer 5, which as an essential solid component MgO contains, which in turn is bound by means of a hydraulic binder, preferably calcium aluminate cement.
- the layer sequence A can-like the interlayer sequence B-also be formed from a sequence of several alternately successive contact layers 1 and first sanding layers 2.
- a first slip is first prepared, the first dry mass of which contains 80 to 90% by weight of a first Y 2 O 3 powder.
- the average grain size d 50 of the first Y 2 O 3 powder is suitably 10 to 15 microns.
- the mode is advantageously 15 to 25 microns.
- the grain band is suitably in the range between 0 to 50 microns.
- the first dry matter contains 10 to 20 wt.%, Preferably 8 to 17 wt.%, Of a Calciumaluminatze- management.
- a first slurry having a viscosity in the range from 400 to 700 mPas is produced.
- the first slip is sprayed onto a, for example made of wax, mold core by spraying.
- the contact layer 1 produced from the first slurry is sanded with a first boundary layer 2.
- the first Besandungs Mrs 2 consists of a second Y 2 O 3 powder, which has a mean grain size in the range of 170 to 200 microns and expediently contains only unavoidable impurities.
- the layer sequence A thus prepared is then dried for a time of about 90 to 180 minutes or a suitable residual moisture content of 10 to 30% is set.
- the aforesaid process of producing the contact layer 1 and the first sanding layer 2 can be repeated several times, for example three to five times.
- the Layer sequence A can also be terminated by a contact layer 1 instead of the first sanding layer 2. It may also be the case that a first sanding layer terminating the layer sequence A is essentially produced from a MgO powder.
- This MgO powder can be designed in terms of its particle size distribution and its average particle size corresponding to the second Y 2 O 3 powder.
- a second slip is produced.
- a second dry mass for producing the second slip contains, for example, 65 to 80% by weight, preferably 65 to 70% by weight, MgO and 20 to 35% by weight, preferably 30 to 35% by weight, of a calcium aluminate cement.
- a second slip is produced whose viscosity is expediently adjusted so that a coating in the conventional dipping process is possible.
- the layer sequence A applied to the mold core is coated with the second slip in the dipping process.
- the second sanding layer 4 is applied, which is formed essentially of a MgO powder having a particle size in the range of 0.1 to 2.0 mm.
- the intermediate layer sequence B thus formed is dried for a period of 15 to 45 minutes or a suitable residual moisture of 10 to 30% is set. Subsequently, further intermediate and second sanding layers 4 can be applied in the same way. The interlayer sequence B can be finally dried for a period of 30 to 100 minutes.
- the cladding layer 5 is from 60 to 80 wt.%, Preferably 70 to 80 wt.%, MgO, 20 to 40 wt.%, Preferably 20 to 30 wt.%, Calciumaluminatzement and water and Excipients made a still flowable mass.
- the coated mandrel is then placed in a mold and surrounded with the flowable mass. After drying the flowable mass, the mold is removed. The mandrel is removed by increasing the temperature. Subsequently, the green compact of the casting mold thus produced is sintered at a temperature in the range from 1000 to 1200 ° C., preferably in the range between 1100 and 1200 ° C.
- a first dry mass for the preparation of the first slurry contains in this case 60 to 70 wt.% Y 2 O 3 and 10 to 20 wt.% CeO 2 , the grain size of the mixture is between 0 to 50 microns. Furthermore, the first dry mass contains 10 to 20 wt.% Of Calciumaluminatzements.
- the first dry mass is mixed with water to form a first slurry having a viscosity in the range of 300 to 600 mPas.
- the drying of the layer sequence A and the interlayer sequence B can also be supported by means of infrared radiation.
- the coated mandrel can be passed through a drying chamber in which an air temperature in the range of 30 to 60 0 C prevails.
- the first and / or second slip can also contain conventional excipients, in particular the organic auxiliaries, in customary amounts in addition to the abovementioned constituents.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Continuous Casting (AREA)
Abstract
L'invention concerne un procédé pour produire un moule servant à couler des masses en fusion hautement réactives, en particulier à couler du titane, des alliages de titane ou des aluminides de titane intermétalliques. Ce procédé comprend les étapes qui consistent : à produire une feuille de contact (1) par application d'une première barbotine contenant une première poudre de Y2O3 en tant que premier composant sensiblement solide sur un noyau; à sabler la couche de contact (1) formée à partir de ladite première barbotine au moyen d'une deuxième poudre Y2O3 contenant du Y2O3 en tant que composant essentiel. L'objectif de cette invention est de rendre ce procédé particulièrement efficace. A cet effet, une première masse sèche destinée à produire la première barbotine contient au moins 75 % en poids de Y2O3, et au moins entre 1,0 et 25 % en poids d'un liant hydraulique en tant que composant solide supplémentaire.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09783352.9A EP2337645B1 (fr) | 2008-09-25 | 2009-09-24 | Procédé pour produire un moule servant à couler une masse en fusion hautement réactive |
US12/998,168 US20110203760A1 (en) | 2008-09-25 | 2009-09-24 | Method for making a mold for casting highly reactive molten masses |
JP2011528316A JP2012503552A (ja) | 2008-09-25 | 2009-09-24 | 高反応性溶融体で鋳造するための鋳型を製造する方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008042376A DE102008042376A1 (de) | 2008-09-25 | 2008-09-25 | Verfahren zur Herstellung einer Gussform zum Vergießen hochreaktiver Schmelzen |
DE102008042376.9 | 2008-09-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2010034762A2 true WO2010034762A2 (fr) | 2010-04-01 |
WO2010034762A3 WO2010034762A3 (fr) | 2010-08-19 |
Family
ID=41794726
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2009/062355 WO2010034762A2 (fr) | 2008-09-25 | 2009-09-24 | Procédé pour produire un moule servant à couler une masse en fusion hautement réactive |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110203760A1 (fr) |
EP (1) | EP2337645B1 (fr) |
JP (1) | JP2012503552A (fr) |
DE (1) | DE102008042376A1 (fr) |
WO (1) | WO2010034762A2 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014531983A (ja) * | 2011-09-30 | 2014-12-04 | ゼネラル・エレクトリック・カンパニイ | 介在物に対する改善された検出性を有する鋳造用鋳型組成物及び鋳造方法 |
DE102016124321A1 (de) | 2016-12-14 | 2018-03-01 | Manfred Renkel | Verfahren zur Herstellung einer Gussform zum Vergießen einer hochreaktiven Schmelze |
DE102016124322A1 (de) | 2016-12-14 | 2018-06-14 | Manfred Renkel | Verfahren zur Herstellung einer Gussform zum Vergießen einer hochreaktiven Schmelze |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
EP3560627B1 (fr) * | 2018-04-24 | 2022-06-08 | Ceranovis GmbH | Procédé de travail d'aluminium fondu ou d'alliage d'aluminium fondu |
CN109063322B (zh) * | 2018-07-27 | 2022-08-02 | 哈尔滨理工大学 | 一种铸件缩松缺陷数值预测的方法 |
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 (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4057433A (en) | 1974-03-05 | 1977-11-08 | Rem Metals Corporation | Oxyfluoride-type mold for casting molten reactive and refractory metals |
EP0093212A1 (fr) | 1982-05-04 | 1983-11-09 | Remet Corporation | Matériau réfractaire |
WO2005039803A2 (fr) | 2003-10-09 | 2005-05-06 | G4T Gmbh | Outil de fabrication de composants coules, procede de fabrication de l'outil et procede de fabrication de composants coules |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3994346A (en) * | 1972-11-24 | 1976-11-30 | Rem Metals Corporation | Investment shell mold, for use in casting of reacting and refractory metals |
JPS6012246A (ja) * | 1983-07-01 | 1985-01-22 | Agency Of Ind Science & Technol | 超合金の一方向性凝固鋳造用インベストメントシエル鋳型の製造法 |
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 |
US5535811A (en) * | 1987-01-28 | 1996-07-16 | Remet Corporation | Ceramic shell compositions for casting of reactive metals |
GB9601910D0 (en) * | 1996-01-31 | 1996-04-03 | Rolls Royce Plc | A method of investment casting and a method of making an investment casting mould |
US7128129B2 (en) * | 2003-10-30 | 2006-10-31 | Wisys Technology Foundation, Inc. | Investment casting slurry composition and method of use |
DE102004048451A1 (de) * | 2004-10-05 | 2006-04-06 | Mk Technology Gmbh | Verfahren und System zum Herstellen einer Schalenform insbesondere für das Feingießen |
-
2008
- 2008-09-25 DE DE102008042376A patent/DE102008042376A1/de not_active Ceased
-
2009
- 2009-09-24 WO PCT/EP2009/062355 patent/WO2010034762A2/fr active Application Filing
- 2009-09-24 EP EP09783352.9A patent/EP2337645B1/fr active Active
- 2009-09-24 JP JP2011528316A patent/JP2012503552A/ja active Pending
- 2009-09-24 US US12/998,168 patent/US20110203760A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4057433A (en) | 1974-03-05 | 1977-11-08 | Rem Metals Corporation | Oxyfluoride-type mold for casting molten reactive and refractory metals |
EP0093212A1 (fr) | 1982-05-04 | 1983-11-09 | Remet Corporation | Matériau réfractaire |
WO2005039803A2 (fr) | 2003-10-09 | 2005-05-06 | G4T Gmbh | Outil de fabrication de composants coules, procede de fabrication de l'outil et procede de fabrication de composants coules |
Non-Patent Citations (1)
Title |
---|
DUARTE T.P ET AL.: "Optimisation of Ceramic Shells for Contact with Reactive Alloys", vol. 587-588, 17 June 2008, MATERIALS SCIENCE FORUM TRANS TECH PUBLICATIONS LTD., pages: 157 - 161 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014531983A (ja) * | 2011-09-30 | 2014-12-04 | ゼネラル・エレクトリック・カンパニイ | 介在物に対する改善された検出性を有する鋳造用鋳型組成物及び鋳造方法 |
DE102016124321A1 (de) | 2016-12-14 | 2018-03-01 | Manfred Renkel | Verfahren zur Herstellung einer Gussform zum Vergießen einer hochreaktiven Schmelze |
DE102016124322A1 (de) | 2016-12-14 | 2018-06-14 | Manfred Renkel | Verfahren zur Herstellung einer Gussform zum Vergießen einer hochreaktiven Schmelze |
Also Published As
Publication number | Publication date |
---|---|
JP2012503552A (ja) | 2012-02-09 |
DE102008042376A1 (de) | 2010-04-08 |
US20110203760A1 (en) | 2011-08-25 |
WO2010034762A3 (fr) | 2010-08-19 |
EP2337645A2 (fr) | 2011-06-29 |
EP2337645B1 (fr) | 2020-04-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2340136B1 (fr) | Procédé pour produire un moule servant à couler des métaux en fusion | |
EP2337645B1 (fr) | Procédé pour produire un moule servant à couler une masse en fusion hautement réactive | |
DE69732397T2 (de) | Beschichtungsverfahren, beschichtungsmittel und damit beschichtete artikel | |
DE1925009C3 (de) | Faserverstärkter Verbundwerkstoff und seine Verwendung | |
DE2939634C2 (fr) | ||
DE2651605A1 (de) | Metallkeramik- und keramikmassen mit hoher temperaturbestaendigkeit, verfahren zu ihrer herstellung und beschichtete gegenstaende, die diese massen enthalten | |
DE69631093T2 (de) | Anorganischer, poröser träger für eine filtrationsmembran und herstellungsverfahren | |
DE1583748A1 (de) | Herstellung von poly-poroesen Mikrostrukturen | |
DE69932687T2 (de) | Partielles Leichtkompositprodukt und Vorform zu seiner Herstellung | |
DE3409385A1 (de) | Verfahren zur herstellung eines geformten siliciumcarbid-produkts | |
EP0564982A2 (fr) | Corps céramique façonné en alumine ayant de l'adhérence de métallisation améliorée | |
DE1458275B2 (de) | Verfahren zum herstellen korrosionsbestaendiger dichter nickelhaltiger ueberzuege auf stahlband | |
DE3051089C2 (fr) | ||
DE2537112C3 (de) | Verfahren zum Herstellen einer Schweißelektrode zum Hartauftragsschweißen | |
DE19606689B4 (de) | Verfahren zur Herstellung eines Verbunderzeugnisses auf Basis eines Leichtmetalls oder einer Leichtmetallegierung | |
DE944725C (de) | Verfahren zur Herstellung gesinterter Filterkoerper | |
DE3540451A1 (de) | Keramikschaumfilter und verfahren zu seiner herstellung | |
EP3145662B1 (fr) | Procédé de production de composants céramiques et/ou métalliques | |
EP1433553A1 (fr) | Matériau composite et procédé pour sa fabrication | |
DE2507571A1 (de) | Faserverstaerkter verbundgegenstand und verfahren zu seiner herstellung | |
DE202007010431U1 (de) | Nagelfeile | |
DE4331307C2 (de) | Herstellung eines mit Kohlenstoffasern verstärkten Verbundwerkstoffs und dessen Verwendung | |
EP2960221B1 (fr) | Produit réfractaire céramique | |
DE1521559A1 (de) | Konstruktionselement und Verfahren zu seiner Herstellung | |
DE2461741A1 (de) | Verfahren zur herstellung eines gesinterten keramikproduktes |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 2011528316 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 12998168 Country of ref document: US |