B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
22/162, 6/41
B22C 1/00 (2006.01) B22C 9/04 (2006.01)
Patent
CA 1267505
ABSTRACT OF THE DISCLOSURE A molding medium and process for making it, preferably for use in the evaporative pattern casting process, is disclosed. The molding medium comprises, in one embodiment, a base granular molding material having spherically shaped grains wherein the individual grains of the material are coated with a refractory material. Preferably the grains are coated first with a binding agent and then mixed with a refractory material, which may be zirconium oxide. After coating, the material is fired at a high temperature, crushed and screened to size, according to one method. Alternatively, the base molding material may itself be a refractory material, in which case the refractory material is fixed with a binding agent to agglomerate the base material into substantially spherical particles and a refractory coating need not be applied. In either embodiment, substantially spherical free-flowing particles are produced having a low angle of repose. This allows the molding medium to come into close contact with the pattern Or the object to be cast. Furthermore, the use of a refractory coating for the particles or the molding medium or a refractory material for the molding medium itself eliminates the need for a refractory wash or coating on the pattern.
490753
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Rikker Leslie D.
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