Praxair S.t. Technology, Inc.

Advanced Ceramics Corporation

Joseph M Morris

The resistant heated flash evaporator of the present invention is designed for flash evaporating a metal charge in a confined area and is substantially horse shoe in geometrical configuration having opposite ends and an upper section with the upper section having a recessed cavity adapted to receive the metal charge and having two leg sections extending downwardly from the opposite ends of the vessel. The cross sectional dimension of each leg section nearest the recessed cavity is substantially smaller in size than the cross sectional dimension of each leg section as it recedes therefrom so as to form a large open area below the recessed cavity.

Flash evaporator vessel

A method of resistance heating using a graphite container having a graphite body and a pyrolytic boron nitride coating in which a metal charge of predetermined weight is deposited over the coating and the container is heated by the application of a variable source of electrical power to cause the metal charge to fully evaporate in a short interval of time of less than two minutes with the heat cycle controlled to provide a cool down period in each cycle of applied power and with a new metal charge introduced upon completion of each heat cycle in a semi-continuous fashion.

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Lincoln, RI, United States of America

Joseph M Morris