Coated crossfire tube assembly

Details Coated crossfire tube assembly Coated crossfire tube assembly

2005-07-05

2005-07-05

Gartenberg, Ehud (Department: 3746)

Power plants

Combustion products used as motive fluid

Plural combustion products generators in ring coaxial with...

C060S799000

Reexamination Certificate

active

06912838

ABSTRACT:
A crossfire tube assembly is provided having an increased resistance to wear and oxidation. This increased resistance is provided by the application of coatings to the mating surfaces between the crossfire tube and crossfire tube clip. In the preferred embodiment, a physical vapor deposition (PVD) Titanium Aluminum Nitride coating is applied to the outer walls of the crossfire tubes which is used in combination with an air plasma spray (APS) Aluminum Bronze coating applied to the crossfire tube clip open end that mates with the crossfire tubes. The coating combination serves to protect the components from frictional wear and extend their life. In an alternate embodiment, the crossfire tubes also contain a plurality of air purge holes that provide a layer of cooling air along the crossfire tube inner wall.

REFERENCES:
patent: 4249372 (1981-02-01), White
patent: 5001896 (1991-03-01), Hilt et al.
patent: 5154049 (1992-10-01), Ford et al.
patent: 5219256 (1993-06-01), Ford et al.
patent: 5361577 (1994-11-01), Cromer
patent: 5749218 (1998-05-01), Cromer et al.
patent: 5896742 (1999-04-01), Black et al.
patent: 6220015 (2001-04-01), Mina
patent: 6334294 (2002-01-01), Belsom et al.

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