| 摘要 |
PROBLEM TO BE SOLVED: To provide a diffusion barrier layer disposed between a superalloy substrate and a protective coating for the substrate. SOLUTION: A diffusion barrier coating includes, in an exemplary embodiment, a composition selected from the group consisting of: a solid-solution alloy comprising rhenium and ruthenium wherein the ruthenium comprises about 50 atom% or less of the composition and where a total amount of rhenium and ruthenium is greater than 70 atom%; an intermetallic compound including at least one of Ru(TaAl) and Ru<SB>2</SB>TaAl, where Ru(TaAl) has a B2 structure and Ru<SB>2</SB>TaAl has a Heusler structure; and an oxide dispersed in a metallic matrix wherein greater than about 50 volume percent of the matrix comprises the oxide. COPYRIGHT: (C)2007,JPO&INPIT |
