Powdered metal titanium coin

Details Powdered metal titanium coin Powdered metal titanium coin

B - Operations, Transporting

22

F

75/155, 13/22, 7

B22F 3/16 (2006.01) B22F 3/17 (2006.01) B22F 7/06 (2006.01) B22F 7/08 (2006.01) C22C 1/04 (2006.01)

Patent

CA 1094358

ABSTRACT OF THE Disclosure A method of making a powdered metal titanium coin is disclosed which includes the steps of cold-pressing powdered titanium at a pressure sufficient to form a coin blank having a density of between about 60% and 90% of its theoretical den- sity. The blank is then coined with coining dies at a pressure sufficient to form a titanium coin having a density of at least 90% of its theoretical density. According to an aspect of the invention, the coin is provided with a ferromagnetic or non- ferromagnetic foil insert so that a coin according to this invention may be distinguished from a counterfeit coin in a vending machine by, for example, changes in a magnetic field through which the coin passes. Optionally, the cold pressing step by be followed by sintering at a temperature of between 1850° F. and 2200° F. Color may be added by heating the blank in a controlled atmosphere.

285460

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