B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
B22C 1/16 (2006.01)
Patent
CA 2098494
PCT/EP 91/01217 Essen, 02.10.92 THYSSEN INDUSTRIE AG PZ 3490/PCT ABSTRACT PROCESS AND BINDER FOR PRODUCING CERAMIC SHELLS AS CASTING MOULDS The invention relates to a process for the manufacture of ceramic shells for use as moulds in which a) a fusible or removable pattern of a part to be cast is produced, b) the pattern is dipped in a slurry of refractory mate- rial and a binder which contains a colloidal, aqueous silica sol and polymers to form a humid coat on the pattern, c) a coarse, refractory powder is sprinkled into the coat, d) the coat is dried, e) the steps b), c) an d) are repeated until the shell has obtained the desired thickness. For the manufacture of quickly drying dip coats whose drying time is comparable to the drying time of shells produced on the base of alcoholic binders the dip coat contains a dis- persion of aqueous colloidal silica sol as a binder to which are added synthetic high polymers and/or an emulsion from the group of silicon-organic compounds to give a coat which, after drying, is waterproof but watervapour-permeable.
Ballewski Heinrich
Graf Herbert
Grossmann Wolfgang
Ballewski Heinrich
Graf Herbert
Grossmann Wolfgang
Macrae & Co.
Thyssen Industrie Ag
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