Howmet Research Corporation

Douglas S Potter

Ranes P Dalal

Kim E Bowen

Jack W Van Heest

David A Cook

David P Ingersoll

Spraycasting method involves directing an atomized metal or alloy spray at a collector disposed in a spray chamber and controlling temperature of the spray in flight in the spray chamber and of the atomized metal or alloy as it is deposited on the collector by a spray chamber pressure control technique that involves in-situ evacuation of the spray chamber during spray deposition to a maintain spray chamber gas partial pressure less than about 400 torr. Such low spray chamber gas partial pressure provides a higher temperature of the atomized spray in flight in the spray chamber and of the sprayed material as it is deposited on a collector in the spray chamber effective to reduce deposit porosity, reduce grain layering or banding, and provide a uniform grain through the thickness of the deposit.

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Montague, MI, United States of America

Douglas S Potter