Novel Room Temperature Method for Rapid In-Situ Removal of Oxide Layers from Superalloy Surfaces

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$511,190.00
Award Year:
2001
Program:
SBIR
Phase:
Phase II
Contract:
F33615-00-C-5606
Award Id:
44336
Agency Tracking Number:
99ML-024
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
12173 Montague Street, Pacoima, CA, 91331
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
052405867
Principal Investigator:
VictorArrieta
Research Engineer
(818) 899-0236
Business Contact:
CraigWard
Technical Administrative
(818) 899-0236
Research Institute:
n/a
Abstract
Both failure analysis and reconditioning of nickel superalloy gas turbine and rocket engine components are plagued by a major problem: the thin oxide films that form on unprotected fracture surfaces during field operation obscure the surfaces intended foranalysis and interfere with repair procedures. Such oxide films mask the fracture surfaces and make them very difficult, if not impossible, to analyze and/or repair. Inhibited chemical etchants have been developed to remove oxide films from steels topreserve the base metal during pickling in the manufacturing processes. No similar process is required during nickel superalloy production, and no such inhibitor has been developed to date. In Phase I, Ultramet demonstrated the feasibility of utilizingultraviolet- and microwave-assisted chemical vapor deposition processes using activated atomic hydrogen gas near room temperature to rapidly remove the oxide films from superalloy fracture surfaces, producing clean nickel alloy component fracture surfacessuitable for failure analysis, repair, and/or joining (brazing). In Phase II, Ultramet will work with Williams International, a well-known small turbine manufacturer, to optimize and scale up the oxide removal technology and define specific brazingapproaches for nickel-based superalloys, specifically including MAR-M-247 and Waspaloy superalloys. Additionally, a mobile, ultraviolet-based oxide removal apparatus will be constructed to demonstrate the versatility, simplicity, and environmentalfriendliness of the process, including suitability for laboratory-scale analysis and field repair.

* information listed above is at the time of submission.

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