Patent ID: 7323247
Filing Date: 2008-01-29
Classification: C04B,C23C,F01D,F05D,F23M,F23R,Y10T

Abstract:
1. A protective barrier coating for a silicon based substrate, comprising: a diffusion barrier coating formed on a substrate, said diffusion barrier coating inhibiting or preventing diffusion of cations from the substrate to an oxidation coating; an oxidation barrier coating formed on the diffusion barrier coating, said oxidation barrier coating comprising a metal disilicate for inhibiting or preventing the oxidation of the substrate; an environmental barrier coating comprising tantalum oxide or an alloy thereof formed on the oxidation barrier coating for preventing water vapor from reacting with the oxidation barrier coating to form volatile Si(OH) a thermal barrier coating formed on the environmental barrier coating, said thermal barrier coating limiting heat transfer from an environment to said environmental barrier coating and shielding the environmental barrier coating from erosion and corrosive dust, wherein said thermal barrier coating includes zirconium oxide alloyed with yttrium oxide.