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1. (WO2019048247) CASTING MOULD FOR PRODUCING CAST PARTS FROM PLATINUM OR HIGH-MELTING PLATINUM ALLOYS
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Pub. No.: WO/2019/048247 International Application No.: PCT/EP2018/072807
Publication Date: 14.03.2019 International Filing Date: 23.08.2018
IPC:
B22C 1/00 (2006.01) ,B22C 1/10 (2006.01) ,B22C 1/18 (2006.01) ,B22C 9/04 (2006.01) ,B22C 21/06 (2006.01) ,B22D 21/06 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
22
CASTING; POWDER METALLURGY
C
FOUNDRY MOULDING
1
Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
B PERFORMING OPERATIONS; TRANSPORTING
22
CASTING; POWDER METALLURGY
C
FOUNDRY MOULDING
1
Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
02
characterised by additives for special purposes, e.g. indicators, breakdown additives
10
for influencing the hardening tendency of the mould material
B PERFORMING OPERATIONS; TRANSPORTING
22
CASTING; POWDER METALLURGY
C
FOUNDRY MOULDING
1
Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
16
characterised by the use of binding agents; Mixtures of binding agents
18
of inorganic agents
B PERFORMING OPERATIONS; TRANSPORTING
22
CASTING; POWDER METALLURGY
C
FOUNDRY MOULDING
9
Moulds or cores; Moulding processes
02
Sand moulds or like moulds for shaped castings
04
Use of lost patterns
B PERFORMING OPERATIONS; TRANSPORTING
22
CASTING; POWDER METALLURGY
C
FOUNDRY MOULDING
21
Flasks; Accessories therefor
04
Upset frames; Bottom boards or mould boards
06
Bottom boards or mould boards
B PERFORMING OPERATIONS; TRANSPORTING
22
CASTING; POWDER METALLURGY
D
CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
21
Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
06
Casting non-ferrous metals with a high melting-point, e.g. metallic carbides
Applicants:
SHERA WERKSTOFF GMBH & CO. KG [DE/DE]; Espohlstraße 53 49448 Lemförde, DE
Inventors:
NOWACK, Norbert; DE
Agent:
FRITZ & BRANDENBURG PATENTANWÄLTE; Postfach 45 04 20 50879 Köln, DE
Priority Data:
10 2017 120 957.311.09.2017DE
Title (EN) CASTING MOULD FOR PRODUCING CAST PARTS FROM PLATINUM OR HIGH-MELTING PLATINUM ALLOYS
(FR) MOULE DE COULÉE POUR LA FABRICATION DE PIÈCES COULÉES EN PLATINE OU EN ALLIAGES DE PLATINE À POINT DE FUSION ÉLEVÉ
(DE) GUSSFORM FÜR DIE HERSTELLUNG VON GUSSTEILEN AUS PLATIN ODER HOCHSCHMELZENDEN PLATINLEGIERUNGEN
Abstract:
(EN) The present invention relates to a casting mould for producing cast parts from platinum or high-melting platinum alloys. According to the invention, the casting mould is produced using a ceramic mixture based on magnesium spinel MgO∙AI2O3. As additives, the ceramic mixture can contain calcium aluminates as a strength accelerator, kaolin as a sintering aid to harden the casting mould, a reactive magnesium oxide or magnesite, which acts as a base on agitation of an embedding compound pulp and a sulfonated melamine resin to reduce the viscosity. The subject matter of the present invention is also a method for producing a casting mould of the aforementioned type in which a ceramic mixture of the specified composition is mixed with a silica sol mixing liquid to produce an embedding compound pulp, the resulting embedding compound pulp is set to form a green casting mould and the casting mould is fired in the kiln.
(FR) La présente invention concerne un moule de coulée pour la fabrication de pièces coulées en platine ou en alliages de platine à point de fusion élevé, qui est fabriqué selon l'invention avec utilisation d'un mélange céramique à base de spinelle de magnésium MgO∙Al2O3. Comme additifs, le mélange céramique peut contenir des aluminates de calcium comme accélérateur de résistance, du kaolin comme adjuvant de frittage pour consolider le moule de coulée, un oxyde de magnésium réactif ou de la magnésite, qui fonctionne comme base lors du délayage d'une suspension de masse d'enrobage et une résine de mélamine sulfonée pour diminuer la viscosité. L'objet de la présente invention concerne en outre un procédé pour la fabrication d'un moule de coulée du type susmentionné, dans lequel on additionne un mélange céramique de la composition indiquée, pour la préparation d'une suspension de masse d'enrobage, d'un liquide de gâchage à base de sol silicique, on laisse prendre la suspension de masse d'enrobage ainsi formée en un moule de coulée cru et on calcine le moule de coulée dans un four.
(DE) Die vorliegende Erfindung betrifft eine Gussform für die Herstellung von Gussteilen aus Platin oder hochschmelzenden Platinlegierungen, welche erfindungsgemäß unter Verwendung einer Keramikmischung auf der Basis des Magnesium-Spinells MgO∙AI2O3 hergestellt ist. Als Additive kann die Keramikmischung Calciumaluminate als Festigkeitsbeschleuniger, Kaolin als Sinterhilfsmittel zur Verfestigung der Gussform, ein reaktives Magnesiumoxid oder Magnesit, welches beim Anrühren eines Einbettmassenbreis als Base wirkt und ein sulfoniertes Melaminharz zur Verringerung der Viskosität enthalten. Gegenstand der vorliegenden Erfindung ist weiterhin ein Verfahren zur Herstellung einer Gussform der vorgenannten Art, bei dem man eine Keramikmischung der angegebenen Zusammensetzung zur Herstellung eines Einbettmassenbreis mit einer Kieselsol-Anmischflüssigkeit versetzt, den daraus entstandenen Einbettmassenbrei zu einer grünen Gussform abbinden lässt und die Gussform im Ofen brennt.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: German (DE)
Filing Language: German (DE)