EP0277577A2 - Investment casting mould for aluminium or its alloys - Google Patents
Investment casting mould for aluminium or its alloys Download PDFInfo
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- EP0277577A2 EP0277577A2 EP88101050A EP88101050A EP0277577A2 EP 0277577 A2 EP0277577 A2 EP 0277577A2 EP 88101050 A EP88101050 A EP 88101050A EP 88101050 A EP88101050 A EP 88101050A EP 0277577 A2 EP0277577 A2 EP 0277577A2
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- European Patent Office
- Prior art keywords
- metal
- investment casting
- coating
- salt
- shell mold
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
Definitions
- the present invention relates to an investment casting shell mold, preferably for hypoeutectic aluminum alloys, in which the rough inner mold wall is coated with a salt mixture with reducing properties.
- a method for reducing the dendrite arm distances is known (DE-OS 35 12 118), in which the improvement in the technological properties of the castings is obtained by means of a special salt mixture, by applying this salt mixture to a particularly rough inner shell of the mold, which prevents germination the dendrite is conducive to metal solidification, so that smaller dendrite arm distances are obtained.
- a special salt mixture by applying this salt mixture to a particularly rough inner shell of the mold, which prevents germination the dendrite is conducive to metal solidification, so that smaller dendrite arm distances are obtained.
- hypoeutectic aluminum alloys such as AlSi7Mgo.6, have improved strength values if low-gas and clean melts are used. what can best be achieved by casting in a vacuum and / or by flushing gas treatment in a rough vacuum and / or filtering the melt. Vaccination of the melt with the help of, for example, strontium or antimony to achieve spherical shaping of the eutectic silicon also leads to an improvement in the technological values.
- Metal films can e.g. according to US-PS 3,462,288, DE-PS 16 21 227, US-PS 3 639 139, US-PS 3 705 051, US-PS 3 836 385 and DE-PS 26 35 798.
- the present invention is based on the object of reducing the dendrite arm spacing when casting hypereutectic aluminum alloys into preheated ones Investment casting bowl shapes can be set correctly and safely.
- the investment casting shell shape is provided on the side facing the casting with a combination of salt and metal coating, the salt coating consisting of a salt or salt mixture with a liquidus temperature below the casting temperature, the cations of which predominantly consist of those the alkali and / or alkaline earth metals and their anions predominantly consist of those of the halogens and the metal coating consists of more than 40 atomic% of one or more metals from the series Al, Ti and / or the alkaline earth metals and / or alloys, mixtures or metallic compounds consists.
- the coating metal optionally in the form of its alloys, mixtures or compounds, is advantageously applied to the inner wall of the mold before, after or simultaneously with the salt coating.
- the coating metal expediently consists of an aluminum alloy which contains 0 to 10% by weight of magnesium and / or 0 to 6% by weight of silicon and / or 0 to 3000 ppm of yttrium and / or one and / or more rare earths and / or beryllium and / or contains bismuth and / or antimony.
- the advantage of the invention is not only the fact that considerably smaller dendrite arm spacings and thus better technological values of the cast molded part, in particular in the case of hypoeutectic aluminum alloys, are obtained, but that at the same time a spherical molding of the silicon is obtained. This is particularly important because it can save additional finishing measures.
- metal films can be applied to the mold inner wall using the various chemical or physical processes.
- metal powder and salt or salt mixture in the form of a slurry or solution at the same time by pouring and pouring them onto the inner shell of the mold.
- metal powders have a greater tendency to oxidize than metal films when preheating the molded shell, it has proven to be advantageous to use metallic alloys and / or compounds or mixtures in powder form which either undergo only a particularly slight oxidation due to their composition when preheating the molded shell or metals are used whose oxide layer is destroyed in the presence of the cast aluminum at casting temperature by an alloy partner.
- the destruction of the oxide film on the surfaces can be achieved, for example, by using aluminum brazing powder with grain sizes of approx. 10 to 50 ⁇ m.
- Usual hard solders contain, for example, beryllium with about 50 ppm as a reducing additive, some additionally with magnesium with about 1.5% and also bismuth or Antimony with approx. 10 to 100 ppm.
- alkaline earth metals yttrium and / or rare earths, for example cerium mixed metal additives, also act as a reducing partner on the oxide film of the metal powder as an alloy partner of the aluminum brazing powder.
- alloys that are easy to grind due to their hardness and are also germ-active. So far, the following metallic compounds, each with an atomic ratio of about 1: 1, have proven themselves: FeAl, FeTi, CaAl, CaSi, TiNi, TiAg. It is a known additional measure to add oxygen getter material to these compounds in small amounts in order to bind production-related oxygen inside the material. It is particularly advantageous to alloy the powders additionally with a noble metal, or to coat the powders thinly after grinding with a noble metal from the platinum group, which is cheaper.
- TiNi powder can be impregnated with a palladium salt solution and then chemically or thermally reduced to produce a thin area of the powder surface coated with precious metal, which does not have an oxide film even after the mold shell has been heated in air. In this way, particularly good wetting of the seed powder by the cast aluminum is achieved.
- the inside of an investment casting shell is coated by pouring in and pouring out and then drying with a slurry consisting of 40 g NaCl, 20 g NaF, 20 g LiCl, 5 g Na4Fe 5 g Na4Fe (CN) 6 and 20 g metal in 1 l water consists.
- a slurry consisting of 40 g NaCl, 20 g NaF, 20 g LiCl, 5 g Na4Fe 5 g Na4Fe (CN) 6 and 20 g metal in 1 l water consists.
- the shell is preheated under protective gas, then brought to about 200 ° C and cast in vacuo with an AlSi7Mgo, 6 of about 700 ° C.
- the bacterial activity of the various metals increased by the salt mixture resulted in the following sequence with decreasing activity: Ti, Al, Mg, Zr, Sr, Hf, Ba, Be, Ca, Se, Nb, V, Ta, Fe, Ni, Co, Sb, Se, Te, Cu, Ag.
- a further improvement in the spacing of the dendrite arms was achieved by adding alkali titanium hexafluoride to the salt mixture, by adding 3 g K2TiF6 and 10 g finely ground aluminum of the composition Al, Mg 1.5% Si 3%, Be 0.01 to the salt defined in Example 1 % was added. After the usual heat treatment, the following values were obtained on tensile specimens with 6 mm ⁇ . 0.2% proof stress 310 - 330 N / mm2 Tensile strength 360 - 380 N / mm2 Elongation at break A5 8 - 10%
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- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft eine Feingußschalenform, vorzugsweise für untereutektische Aluminiumlegierungen, bei der die rauhe Forminnenwand mit einem Salzgemisch mit reduzierenden Eigenschaften beschichtet ist.The present invention relates to an investment casting shell mold, preferably for hypoeutectic aluminum alloys, in which the rough inner mold wall is coated with a salt mixture with reducing properties.
Es ist ein Verfahren zur Verringerung der Dendritenarmabstände bekannt (DE-OS 35 12 118), bei dem die Verbesserung der technologischen Eigenschaften der Gußteile mittels einer besonderen Salzmischung erhalten wird, indem diese Salzmischung auf eine besonders rauhe Formschalen-Innenwand aufgebracht wird, was der Keimung der Dendriten bei der Mettallerstarrung förderlich ist, sodass kleinere Dendritenarmabstände erhalten werden. Darüberhinaus ist aus dieser Schrift bekannt, dass eine grosse Anzahl von keimwirksamen Substanzen in der Literatur beschrieben sind.A method for reducing the dendrite arm distances is known (DE-OS 35 12 118), in which the improvement in the technological properties of the castings is obtained by means of a special salt mixture, by applying this salt mixture to a particularly rough inner shell of the mold, which prevents germination the dendrite is conducive to metal solidification, so that smaller dendrite arm distances are obtained. In addition, it is known from this document that a large number of germ-active substances have been described in the literature.
Es ist ausserdem bekannt (J.A.Reynolds und C.R.Tottle, Journal of the Inst. of Metals, Vol.80 (1951 - 52), Seiten 93 - 98), dass pulverförmig auf die Gußform-Innenwand aufgebrachtes Metall eine Kornverfeinerung des Gußstücks bewirken kann. Für den Werkstoff Aluminium und Aluminium-Legierungen wurden Pulver aus Aluminium, Titan, Magnesium, Vanadium, Thorium und Calciumdisilizid als kornverfeinernd gefunden, wobei die vorgenannte Reihe abnehmende Wirkung zeigt. Die Wirkung von Metallpulver als keimaktiv auf die Ausbildung der Dendritenarmabstände wurde bei Reynolds und Tottle jedoch nicht untersucht und in dieser Literaturstelle nicht nahegelegt. Ausserdem erfolgte die gesamten Untersuchungen unter Laborbedingungen an kalten Formen, sodass der Schutz der Metallvulber vor Oxydation weder untersucht noch ein solcher Schutz in Betracht gezogen wurde.It is also known (J.A. Reynolds and C.R. Tottle, Journal of the Inst. Of Metals, Vol.80 (1951-52), pages 93-98) that metal applied in powder form to the inner wall of the mold can cause grain refinement of the casting. For the material aluminum and aluminum alloys, powders of aluminum, titanium, magnesium, vanadium, thorium and calcium disilicide have been found to refine the grain, the abovementioned series showing a decreasing effect. The effect of metal powder as germ-active on the formation of the dendrite arm distances was not investigated by Reynolds and Tottle and was not suggested in this reference. In addition, the entire investigation was carried out under laboratory conditions on cold molds, so that the protection of metal contaminants against oxidation was neither examined nor considered.
Es ist ferner bekannt, dass untereutektische Aluminium-Legierungen, wie z.B. AlSi7Mgo.6, dann verbesserte Festigkeitswerte aufweisen, wenn gasarme und saubere Schmelzen verwendet werden, was man ambbesten durch Abguß im Vakuum und/oder durch eine Spülgasbehandlung im Grobvakuum und/oder Filtrierung der Schmelze erreicht. Impfungen der Schmelze mit Hilfe von z.B. Strontium oder Antimon zur Erzielung einer kugeligen Einformung des eutektischen Siliziums führen ebenfalls zu einer Verbesserung der technologischen Werte.It is also known that hypoeutectic aluminum alloys, such as AlSi7Mgo.6, have improved strength values if low-gas and clean melts are used. what can best be achieved by casting in a vacuum and / or by flushing gas treatment in a rough vacuum and / or filtering the melt. Vaccination of the melt with the help of, for example, strontium or antimony to achieve spherical shaping of the eutectic silicon also leads to an improvement in the technological values.
Die Aufbringung von Metallfilmen auf unterschiedliche Materialien auch solche keramischer Art, ist an sich bekannt. Metallfilme lassen sich z.B. nach den US-PS 3 462 288, DE-PS 16 21 227, US-PS 3 639 139, US-PS 3 705 051, US-PS 3 836 385 und DE-PS 26 35 798 aufbringen.The application of metal films to different materials, including those of a ceramic type, is known per se. Metal films can e.g. according to US-PS 3,462,288, DE-PS 16 21 227, US-PS 3 639 139, US-PS 3 705 051, US-PS 3 836 385 and DE-PS 26 35 798.
Da bisher kein Verfahren bekannt ist, mit dem man mit metallischer Beschichtung der Formschale und deren Vorwärmung an Luft oder an Sauerstoff verunreinigtem Schutzgas eine Keimung der Dendriten erzielen kann, liegt der vorliegenden Erfindung die Aufgabe zugrunde, kleinere Dendritenarmabstände beim Abgiessen untereutektischer Aluminium-Legierungen in vorgewärmte Feingußschalenformen einwandfrei und sicher einzustellen.Since no method is known to date with which the metallic coating of the molded shell and its preheating in air or in oxygen-contaminated protective gas can cause germination of the dendrites, the present invention is based on the object of reducing the dendrite arm spacing when casting hypereutectic aluminum alloys into preheated ones Investment casting bowl shapes can be set correctly and safely.
Die Lösung dieser Aufgabe besteht darin, dass die Feingußschalenform auf der dem Guß zugewandten Seite mit einer Kombination von Salz- und Metallbeschichtung versehen ist, wobei die Salzbeschichtung aus einem Salz bzw. Salzgemisch mit einer unterhalb der Abgußtemperatur liegenden Liquidustemperatur besteht, dessen Kationen überwiegend aus denen der Alkali- und/oder Erdalkalimetalle und deren Anionen überwiegend aus denen der Halogene bestehen und die Metallbeschichtung zu mehr als 40 Atom% aus einem oder mehreren Metallen aus der Reihe Al, Ti und/oder der Erdalkalimetalle und/oder Legierungen, Mischungen oder metallischen Verbindungen besteht.The solution to this problem is that the investment casting shell shape is provided on the side facing the casting with a combination of salt and metal coating, the salt coating consisting of a salt or salt mixture with a liquidus temperature below the casting temperature, the cations of which predominantly consist of those the alkali and / or alkaline earth metals and their anions predominantly consist of those of the halogens and the metal coating consists of more than 40 atomic% of one or more metals from the series Al, Ti and / or the alkaline earth metals and / or alloys, mixtures or metallic compounds consists.
Vorteilhaft wird das Beschichtungsmetall, gegebenenfalls in Form seiner Legierungen, Mischungen oder Verbindungen, vor, nach oder gleichzeitig mit der Salzbeschichtung auf die Forminnenwand aufgebracht.The coating metal, optionally in the form of its alloys, mixtures or compounds, is advantageously applied to the inner wall of the mold before, after or simultaneously with the salt coating.
Zweckmässig besteht das Beschichtungsmetall aus einer Aluminium-Legierung, die 0 bis 10 Gew% Magnesium enthält und/oder 0 bis 6 Gew% Silizium und/oder 0 bis 3000 ppm Yttrium und/oder eine und/oder mehrere Seltene Erden und/oder Beryllium und/oder Wismut und/oder Antimon enthält.The coating metal expediently consists of an aluminum alloy which contains 0 to 10% by weight of magnesium and / or 0 to 6% by weight of silicon and / or 0 to 3000 ppm of yttrium and / or one and / or more rare earths and / or beryllium and / or contains bismuth and / or antimony.
Der Vorteil der Erfindung ist nicht nur die Tatsache, dass man erheblich kleinere Dendritenarmabstände und damit bessere technologische Werte des abgegossenen Formteils, insbesondere bei untereutektischen Aluminium-Legierungen erhält, sondern dass gleichzeitig eine kugelige Einformung des Siliziums erhalten wird. Dies ist vor allem deswegen wichtig, weil dadurch zusätzliche Veredelungsmassnahmen eingespart werden können.The advantage of the invention is not only the fact that considerably smaller dendrite arm spacings and thus better technological values of the cast molded part, in particular in the case of hypoeutectic aluminum alloys, are obtained, but that at the same time a spherical molding of the silicon is obtained. This is particularly important because it can save additional finishing measures.
Nach den eingang genannten Schritten können Metallfilme nach den verschiedenen chemischen oder physikalischen Verfahren auf die Forminnenwand aufgebracht werden. Es ist jedoch wegen der einfacheren Handhabung vorteilhaft, Metallvulber und Salz bzw. Salzgemisch in Form einer Aufschlämmung bzw. Lösung gleichzeitig durch Ein- und Ausgiessen auf die Formschaleninnenwand aufzubringen.After the steps mentioned at the beginning, metal films can be applied to the mold inner wall using the various chemical or physical processes. However, because of the simpler handling, it is advantageous to apply metal powder and salt or salt mixture in the form of a slurry or solution at the same time by pouring and pouring them onto the inner shell of the mold.
Da Metallpulver bei der Vorwärmung der Formschale stärker zur Oxydation neigen als Metallfilme, hat es sich als günstig herausgestellt metallische Legierungen und/oder Verbindungen bzw. Mischungen in Pulverform zu verwenden, die entweder bei der Vorwärmung der Formschale nur eine besonders geringe Oxydation aufgrund ihrer Zusammensetzung erfahren oder man verwendet Metalle, deren Oxydschicht in Gegenwart des Gußaluminiums bei Abgußtemperatur durch einen Legierungspartner zerstört wird. Die Zerstörung des Oxydfilms auf den Oberflächen erreicht man beispielsweise, indem man Aluminium-Hartlotpulver mit Korngrössen von ca. 10 bis 50 µm verwendet. Übliche Hartlote enthalten z.B. als reduzierend wirkenden Zusatz Beryllium mit etwa 50 ppm, manche zusätzlich Magnesium mit ca. 1,5% und auch Wismut oder Antimon mit ca. 10 bis 100 ppm. Zur Dendritenkeimung ist es dabei aber günstig, den Siliziumgehalt heute üblicher Hartlote zu senken oder besser, ihn vollständig zu vermeiden. Als reduzierend auf den Oxydfilm der Metallpulver wirken aber auch weitere Erdalkalimetalle, Yttrium und/oder Seltene Erden, z.B. Cer-Mischmetallzusätze, als Legierungspartner des Aluminium-Hartlotpulvers.Since metal powders have a greater tendency to oxidize than metal films when preheating the molded shell, it has proven to be advantageous to use metallic alloys and / or compounds or mixtures in powder form which either undergo only a particularly slight oxidation due to their composition when preheating the molded shell or metals are used whose oxide layer is destroyed in the presence of the cast aluminum at casting temperature by an alloy partner. The destruction of the oxide film on the surfaces can be achieved, for example, by using aluminum brazing powder with grain sizes of approx. 10 to 50 µm. Usual hard solders contain, for example, beryllium with about 50 ppm as a reducing additive, some additionally with magnesium with about 1.5% and also bismuth or Antimony with approx. 10 to 100 ppm. For dendrite germination, however, it is beneficial to lower the silicon content of hard solders common today, or better to avoid it completely. However, other alkaline earth metals, yttrium and / or rare earths, for example cerium mixed metal additives, also act as a reducing partner on the oxide film of the metal powder as an alloy partner of the aluminum brazing powder.
Man wählt möglichst Legierungen, die sich wegen ihrer Härte auf einfache Weise mahlen lassen und gleichzeitig keimaktiv sind. Bisher haben sich die folgenden metallischen Verbindungen mit jeweils etwa 1:1 im Atomverhältnis bewährt : FeAl, FeTi, CaAl, CaSi, TiNi, TiAg.
Es ist eine an sich bekannte zusätzliche Massnahme, diesen Verbindungen noch Sauerstoffgetter-Material in geringen Mengen zuzusetzen, um herstellungsbedingten Sauerstoff im Innern des Materials abzubinden. Besonders vorteilshaft ist es, die Pulver zusätzlich mit einem Edelmetall zu legieren, oder die Pulver nach der Mahlung mit einem Edelmetall der Platingruppe dünn zu beschichten, was preiswerter ist. Beispielsweise lassen sich auf TiNi-Pulver durch Imprägnieren mit einer Palladiumsalzlösung und anschliessender chemischer oder thermischer Reduzierung dünn mit Edelmetall beschichtete Bereich der Pulveroberfläche erzeugen, die auch nach Erhitzung der Formschale an Luft keinen Oxydfilm aufweisen. Auf diese Weise wird eine besonders gute Benetzung des Keimpulvers durch das Gußaluminium erzielt.We choose alloys that are easy to grind due to their hardness and are also germ-active. So far, the following metallic compounds, each with an atomic ratio of about 1: 1, have proven themselves: FeAl, FeTi, CaAl, CaSi, TiNi, TiAg.
It is a known additional measure to add oxygen getter material to these compounds in small amounts in order to bind production-related oxygen inside the material. It is particularly advantageous to alloy the powders additionally with a noble metal, or to coat the powders thinly after grinding with a noble metal from the platinum group, which is cheaper. For example, TiNi powder can be impregnated with a palladium salt solution and then chemically or thermally reduced to produce a thin area of the powder surface coated with precious metal, which does not have an oxide film even after the mold shell has been heated in air. In this way, particularly good wetting of the seed powder by the cast aluminum is achieved.
Bevorzugte Ausführungsformen der Erfindung sind in den nachstehenden Beispielen beschrieben.Preferred embodiments of the invention are described in the examples below.
Die Innenseite einer Feingußformschale wird durch Ein- und Ausschütten und anschliessender Trocknung mit einer Aufschlämmung beschichtet, welche aus 40 g NaCl, 20 g NaF, 20 g LiCl, 5 g Na₄Fe 5 g Na₄Fe(CN)₆ und 20 g Metall in 1 l Wasser besteht. DieThe inside of an investment casting shell is coated by pouring in and pouring out and then drying with a slurry consisting of 40 g NaCl, 20 g NaF, 20 g LiCl, 5 g Na₄Fe 5 g Na₄Fe (CN) ₆ and 20 g metal in 1 l water consists. The
Die Schale wird unter Schutzgas vorgewärmt, dann auf etwa 200°C gebracht und im Vakuum mit einem AlSi7Mgo,6 von ca. 700°C vergossen. Die durch das Salzgemisch verstärkte Keimwirksamkeit der verschiedenen Metalle ergaben folgende Reihenfolge mit abnehmender Wirksamkeit :
Ti, Al, Mg, Zr, Sr, Hf, Ba, Be, Ca, Se, Nb, V, Ta, Fe, Ni, Co, Sb, Se, Te, Cu, Ag.The shell is preheated under protective gas, then brought to about 200 ° C and cast in vacuo with an AlSi7Mgo, 6 of about 700 ° C. The bacterial activity of the various metals increased by the salt mixture resulted in the following sequence with decreasing activity:
Ti, Al, Mg, Zr, Sr, Hf, Ba, Be, Ca, Se, Nb, V, Ta, Fe, Ni, Co, Sb, Se, Te, Cu, Ag.
Die Aufbringung der Innenbeschichtung der Feingußformschale mittels einer Aufschlämmung ergibt eine besonders einfache Ausführungsform der Erfindung.The application of the inner coating of the investment casting shell by means of a slurry results in a particularly simple embodiment of the invention.
Folgende Werte des abgegossenen Formstücks wurden erhalten.
0.2% Dehngrenze 305 - 325 N/mm²
Zugfestigkeit 365 - 380 N/mm²
Bruchdehnung A₅ 9 - 12 %The following values of the cast molding were obtained.
0.2% proof stress 305 - 325 N / mm²
Tensile strength 365 - 380 N / mm²
Elongation at break A₅ 9 - 12%
Eine Aufbringung des Aluminiummetallfilms auf die Innenseite der Feingußformschale und anschliessende Beschichtung der Metallschicht (die die Rauhigkeiten der Feingußformschale abbildet) mit der getrockneten Salzschicht, ergibt einen besonders guten Schutz des Aluminiummetallfilmes gegen Oxydation, was wiederum zu einer Verringerung des Dendritenarmabstandes führt.Applying the aluminum metal film to the inside of the investment casting shell and then coating the metal layer (which reflects the roughness of the investment casting shell) with the dried salt layer results in particularly good protection of the aluminum metal film against oxidation, which in turn leads to a reduction in the dendrite arm spacing.
Ergibt folgende Werte
0.2% Dehngrenze 300 - 310 N/mm²
Zugfestigkeit 360 - 380 N/mm²
Bruchdehnung A₅ 9 - 11%Returns the following values
0.2% proof stress 300 - 310 N / mm²
Tensile strength 360 - 380 N / mm²
Elongation at break A₅ 9 - 11%
Eine weitere Verbesserung der Abstände der Dendritenarme wurde durch Zusatz von Alkali-Titan-Hexafluorid zum Salzgemisch erzielt, indem zu dem im Beispiel 1 definierten Salz zusätzlich 3 g K₂TiF₆ und 10 g feingemahlenes Aluminium der Zusammensetzung Al,Mg 1.5% Si 3%, Be 0.01% zugefügt wurde.Nach üblicher Wärmebehandlung wurden an Zugproben mit 6 mm ⌀ folgende Werte erhalten.
0.2% Dehngrenze 310 - 330 N/mm²
Zugfestigkeit 360 - 380 N/mm²
Bruchdehnung A₅ 8 - 10 %A further improvement in the spacing of the dendrite arms was achieved by adding alkali titanium hexafluoride to the salt mixture, by adding 3 g K₂TiF₆ and 10 g finely ground aluminum of the composition Al, Mg 1.5% Si 3%, Be 0.01 to the salt defined in Example 1 % was added. After the usual heat treatment, the following values were obtained on tensile specimens with 6 mm ⌀.
0.2% proof stress 310 - 330 N / mm²
Tensile strength 360 - 380 N / mm²
Elongation at break A₅ 8 - 10%
Claims (8)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3703416 | 1987-02-05 | ||
| DE3703416A DE3703416A1 (en) | 1987-02-05 | 1987-02-05 | Investment casting shell mold for aluminum or WHOSE ALLOYS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0277577A2 true EP0277577A2 (en) | 1988-08-10 |
| EP0277577A3 EP0277577A3 (en) | 1988-11-30 |
| EP0277577B1 EP0277577B1 (en) | 1990-10-31 |
Family
ID=6320251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88101050A Expired - Lifetime EP0277577B1 (en) | 1987-02-05 | 1988-01-26 | Investment casting mould for aluminium or its alloys |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0277577B1 (en) |
| JP (1) | JPS63268534A (en) |
| BR (1) | BR8800436A (en) |
| CS (1) | CS71088A3 (en) |
| DE (2) | DE3703416A1 (en) |
| ES (1) | ES2018857B3 (en) |
| IL (1) | IL85274A (en) |
| RU (1) | RU1839646C (en) |
| ZA (1) | ZA88617B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2421207A (en) * | 2004-12-16 | 2006-06-21 | Cosworth Technology Ltd | Casting with a halogen containing compound provided on the mould surface |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19929290A1 (en) * | 1999-06-25 | 2000-12-28 | Volkswagen Ag | Process for the production of magnesium-containing metal castings |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3476171A (en) * | 1967-02-14 | 1969-11-04 | Reactive Metals Inc | Method for melting refractory metal |
| EP0198290A2 (en) * | 1985-04-03 | 1986-10-22 | Thyssen Industrie Ag | Method of casting aluminium alloys |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3019497A (en) * | 1958-11-21 | 1962-02-06 | Howe Sound Co | Making fine grained castings |
-
1987
- 1987-02-05 DE DE3703416A patent/DE3703416A1/en active Granted
-
1988
- 1988-01-26 DE DE8888101050T patent/DE3860894D1/en not_active Expired - Fee Related
- 1988-01-26 ES ES88101050T patent/ES2018857B3/en not_active Expired - Lifetime
- 1988-01-26 EP EP88101050A patent/EP0277577B1/en not_active Expired - Lifetime
- 1988-01-29 ZA ZA880617A patent/ZA88617B/en unknown
- 1988-02-01 IL IL85274A patent/IL85274A/en unknown
- 1988-02-04 CS CS88710A patent/CS71088A3/en unknown
- 1988-02-04 RU SU884355239A patent/RU1839646C/en active
- 1988-02-04 BR BR8800436A patent/BR8800436A/en unknown
- 1988-02-04 JP JP63022972A patent/JPS63268534A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3476171A (en) * | 1967-02-14 | 1969-11-04 | Reactive Metals Inc | Method for melting refractory metal |
| EP0198290A2 (en) * | 1985-04-03 | 1986-10-22 | Thyssen Industrie Ag | Method of casting aluminium alloys |
Non-Patent Citations (1)
| Title |
|---|
| JOUORNAL OF THE INSTITUTE OF METALS, Band 80, 1951-1952, London, GB; J.A. REYNOLDS et al.: "The nucleation of cast metals at the mould face" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2421207A (en) * | 2004-12-16 | 2006-06-21 | Cosworth Technology Ltd | Casting with a halogen containing compound provided on the mould surface |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA88617B (en) | 1988-08-02 |
| RU1839646C (en) | 1993-12-30 |
| EP0277577B1 (en) | 1990-10-31 |
| JPS63268534A (en) | 1988-11-07 |
| IL85274A0 (en) | 1988-07-31 |
| DE3860894D1 (en) | 1990-12-06 |
| DE3703416A1 (en) | 1988-08-18 |
| BR8800436A (en) | 1988-09-20 |
| CS71088A3 (en) | 1992-08-12 |
| ES2018857B3 (en) | 1991-05-16 |
| EP0277577A3 (en) | 1988-11-30 |
| DE3703416C2 (en) | 1992-01-16 |
| IL85274A (en) | 1992-01-15 |
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