METHOD FOR PRODUCING INVESTMENT CASTINGS

A method for producing investment castings, preferably in ceramic moulds, from alloys based on Al, Mg, Cu, Zn and Fe, characterised in that the ceramic mould is baked at temperatures of 800-1000° C. for 2-4 hours, then the mould is cooled to a temperature of 20-950° C. and is held at this temperatur...

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Bibliographic Details
Main Authors KARWINSKI, ALEKSANDER, CZEKAJ, EDWARD
Format Patent
LanguageEnglish
French
German
Published 21.10.2015
Subjects
CASTING
CASTING OF METALS
CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
PERFORMING OPERATIONS
POWDER METALLURGY
TRANSPORTING
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Summary:A method for producing investment castings, preferably in ceramic moulds, from alloys based on Al, Mg, Cu, Zn and Fe, characterised in that the ceramic mould is baked at temperatures of 800-1000° C. for 2-4 hours, then the mould is cooled to a temperature of 20-950° C. and is held at this temperature for 10-40 minutes, then it is poured with liquid alloy overheated by from 50 to 200° C. above the initial melting point and after a lapse of 10-100 seconds, the mould is immersed at a fixed or variable speed in a liquid cooling medium, which is a 1-99 volume percent aqueous solution of liquid polymer at a temperature of 15-85° C. The liquid polymer is a polymer of the PAG or PVP, or ACR, or PEO type. The ceramic moulds made of aluminosilicate, or high alumina refractory materials, especially based on synthetic sand, for example Molochite, are used.
Bibliography:Application Number: EP20120772821