Coating processes – Restoring or repairing – Metal article
Patent
1998-12-22
2000-03-28
Bareford, Katherine A.
Coating processes
Restoring or repairing
Metal article
427454, 298891, B32B 3500
Patent
active
060428805
ABSTRACT:
A thermal barrier coating (TBC) system, comprising a metallic bond coat on an article surface and an outer ceramic TBC is repaired by renewing without removing the bond coat. The outer ceramic TBC is removed to expose a bond coat substrate. At least one discrete local surface area of the article surface subject to bond coat degradation is selected from a thermal pattern unique to the article surface from service operation. At least one renewal metal selected from Pt, Rh, and Pd is applied at least to the selected discrete local surface area and heated to diffuse the renewal metal into the bond coat substrate. An environmental resistant coating selected from aluminides and alloys including aluminum is applied at least to the discrete local surface area over the renewal metal. Thereafter, an outer ceramic TBC is applied to the article surface.
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Conner Jeffrey A.
Nagaraj Bangalore A.
Rigney Joseph D.
Wortman David J.
Bareford Katherine A.
General Electric Company
Gressel Gerry S.
Hess Andrew C.
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