Patent Number: 6,254,997

Title: Article with metallic surface layer for heat transfer augmentation and method for making

Abstract: An article comprising a substrate and an outer metallic layer, such as a coating, is provided with augmented heat transfer from the substrate through the combination of a layer thickness of about 0.003" to about 0.017", a layer surface roughness of at least about 500 micro inches Ra, a layer tensile bond strength of at least about 5 ksi, and a heat transfer augmentation of at least about 1.1. A method of making the article uses an electric arc wire thermal spray process in which the atomizing gas pressure is maintained within the range of about 20-80 psi.

Inventors: Rettig; Mark G. (Cincinnati, OH), Farmer; Gilbert (Cincinnati, OH), Tomlinson; Thomas J. (West Chester, OH), Zimmerman, Jr.; Robert G. (Morrow, OH), Gupta; Bhupendra K. (Cincinnati, OH)

Assignee: General Electric Company

International Classification: C23C 4/08 (20060101); C23C 30/00 (20060101); C23C 4/12 (20060101); F28F 13/18 (20060101); F28F 13/00 (20060101); F23M 5/00 (20060101); B32B 018/16 (); B22F 007/04 (); C23C 004/12 ()

Expiration Date: 07/03/2018