B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
B22C 9/12 (2006.01) C23C 24/04 (2006.01)
Patent
CA 2178519
A method of applying a refractory coating to densified foundry sand cores having micropores between the sand grains having the steps of: (a) mixing a dry powder refractory material (anhydrous MmgOSiO2 talc) with a dry powder impacting media, the refractory material having a particle size in the range of 5-40 microns and the weight ratio between the refractory material and the impacting media; (b) fluidizing the mixture in a contained zone by introducing positive air pressure at one end of the zone and applying a negative pressure at the other end of the zone; and (c) quickly and entirely immersing the sand cores in the zone containing the fluidized mixture and substantially immediately thereafter withdrawing (without reciprocal movement) such sand cores without the need for added motion to be coated with essentially only the refractory material as impacted by the impacting media. The cores will be coated continuously with the refractory material, impacted with the micropores of the sand core.
Kirby Arthur Miller
Rowe Melvin Lynwood
Ford Motor Company Of Canada Limited
Sim & Mcburney
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