Spraycast method and article

US6296043A · kind A · utility

Assignee

• Howmet Research Corporation · US

Inventors

• Kim E. Bowen · Whitehall, US
• Douglas Potter · Naples, US
• David Cook · Barrington, US
• David Ingersoll · Albuquerque, US
• Jack W. van Heest · Hillsdale, US
• Ranes P. Dalal · Muskegon, US

Key dates

• Filing date: Dec 10, 1996
• Grant date: Oct 2, 2001
• Expiry date: Dec 10, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T50/60
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

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.