Patent ID: 7300702

Claim:
A component, comprising: a silicon-based substrate; a diffusion barrier coating disposed on said substrate, wherein said diffusion barrier coating comprises: a first isolation layer disposed on said silicon-based substrate; a first oxygen barrier layer disposed on said first isolation layer; and a second isolation layer disposed on said first oxygen barrier layer, wherein said first oxygen barrier layer comprises a SiO 2 -based material, wherein said first isolation layer comprises a material selected from the group consisting of Ta 2 O 5 , Ta 5 Si 3 , TaSi 2 , MoSi 2 , Mo 5 Si 3 , Si 3 N 4 , Si 2 N 2 O, and SiC; and wherein said second isolation layer comprises a material selected from the group consisting of Ta 2 O 5 , Ta 5 Si 3 , TaSi 2 , MoSi 2 , and Mo 5 Si 3 ; and an environmental barrier coating disposed on said diffusion barrier coating.