Coating for molds and expendable cores

Details Coating for molds and expendable cores Coating for molds and expendable cores

B - Operations, Transporting

22

C

6/45

B22C 3/00 (2006.01) B22C 9/10 (2006.01)

Patent

CA 1235254

ABSTRACT OF THE DISCLOSURE A resin-bonded sand core for high-pressure die casting methods having a first refractory coating, such as of silica, with an inorganic binding agent of colloidal silica and a clay such as kaolin, and a second or top coating of a refractory material containing zircon and an organic binding agent, which combination of these two different coatings enables the bonded sand core to have high pressure and temperature resistance, good washout resistance, freedom from surface penetration, and good shake-out properties.

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