Article with metallic surface layer for heat transfer...

Details Article with metallic surface layer for heat transfer... Article with metallic surface layer for heat transfer...

1998-12-16

2001-07-03

Jones, Deborah (Department: 1775)

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

C428S612000, C428S628000, C428S678000, C428S680000, C428S937000, C416S24100B, C416S24100B

Reexamination Certificate

active

06254997

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to articles operating at relatively high temperatures; and more particularly, to such articles the efficiency of which can be enhanced by removal of heat therefrom during operation.
Hot operating components of gas turbine engines, for example those designed to operate in engine portions from the combustion section toward the rear of the engine, are benefited by means to remove heat from such articles. Such components or articles include combustion chamber parts, exhaust liners, various flaps and seals, and turbine section parts including frames. nozzles, blade platforms and ducts. Reduction in heat can allow the component, and hence the engine, to operate at higher, more efficient temperatures, as well as extend the operating life of the component. It is common practice and widely reported in the gas turbine art to use cooling air for such heat reduction. However, there is a limit to the amount of cooling air available for such use, and design of the engine must balance design operating temperatures with cooling air availability.
BRIEF SUMMARY OF THE INVENTION
The present invention, in one form, provides an article comprising a substrate and a metallic outer surface layer having characteristics which augment heat transfer from the article. Such a metallic outer surface layer comprises a layer thickness of about 0.003″-0.017″ in combination with a layer surface roughness of greater than about 500 micro inches average layer surface roughness (Ra).


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