Environmental barrier coating for silicon based substrates such as silicon nitride
AssigneeUnited Technologies Corporation
InventorsHarry E. Eaton, Shantikumar V. Nair, Ellen Y. Sun, Tania Bhatia
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Abstract
A bond layer for a silicon based substrate comprises a mixture of a first phase and a second phase, wherein the first phase is selected from the group consisting of refractory metal oxides, refractory metal silicates and mixtures thereof and the second phase is selected from the group consisting of refractory metal oxide forming metals, SiC, Si3N4, and mixtures thereof.
Claims26
An article comprising a silicon based substrate and a bond layer, the bond layer comprises a first phase and a second phase, wherein the first phase is selected from the group consisting of refractory metal oxides, refractory metal silicates and mixtures thereof and the second phase is a refractory metal oxide forming metal selected from the group consisting of chromium, silicon, tantalum, niobium, hafnium, yttrium, aluminum, zirconium, titanium, rare earth metals, alkaline earth metals and mixtures thereof.
An article comprising a silicon based substrate and a bond layer, the bond layer comprises a first phase and a second phase, wherein the first phase comprises a constituent selected from the group consisting of niobium oxide, hafnium oxide and mixtures thereof and the second phase comprises a constituent selected from the group consisting of refractory metal oxide forming metals, SiC, Si3N4, and mixtures thereof.
An article comprising a silicon based substrate;
- a bond layer, and at least one intermediate layer between the substrate and the bond layer, the bond layer comprises a first phase and a second phase, wherein the first phase comprises a constituent selected from the group consisting of refractory metal oxides, refractory metal silicates and mixtures thereof and the second phase comprises a constituent selected from the group consisting of refractory metal oxide forming metals, SiC, Si3N4, and mixtures thereof.
Dependencies are inferred from the claim text.