C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
25/140, 57/23, 2
C08J 5/14 (2006.01) C04B 35/653 (2006.01) C09K 3/14 (2006.01)
Patent
CA 1112430
ABSTRACT OF THE DISCLOSURE A continuous process for casting a molten oxide such as an aluminous oxide abrasive is provided wherein two thin metal belts are brought into face-to-face relation and the molten oxide is poured into the nip between the belts as they come into face- to-face relation. The freezing abrasive maintains the belts slightly paced apart on the order of some small fraction of an inch (e.g. 1/16) and the back surface of the belt is flooded with copious quantities of cooling fluid (e.g. water) to maintain the belts below red heat. The belts are held in closely spaced re- lation for a sufficient time to permit the abrasive to be cooled below red heat. The belts are then separated and the abrasive is discharged from between the belts. At this point the abrasive is no longer affected by contaminants in the air, this aspect of the invention being particularly important in those embodiments of the invention where the molten abrasive (e.g. alumina zirconia abrasive) contains reduction products such as sub-oxides or ele- mental metal particles. In a preferred embodiment of the invention the top belt can be considerably wider than the bottom belt so that there is no water maintained on an upwardly facing surface which is subsequently to contact the molten abrasive.
317721
Gowling Lafleur Henderson Llp
Norton Company
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