Patent ID: 9561986
Date: 2017-02-07
CPC Classifications: C04B,F01D,F05D,Y10T

Claim:
1. An article, comprising: a substrate that contains silicon carbide, silicon nitride, a silicide and/or silicon as a reinforcement phase and/or a matrix phase; a bondcoat overlying the substrate, wherein the bondcoat is formed of a material containing elemental silicon; silicon with one or more additional metal, intermetallic and/or ceramic phases; and/or one or more silicon alloys or compounds; at least one outer layer overlying the bondcoat, wherein the at least one outer layer contains rare earth silicates and/or aluminosilicates; and a constituent layer on the surface of the bondcoat and between and contacting the bondcoat and the at least one outer layer, the constituent layer being formed by constituents of the bondcoat and being susceptible to creep within an operating environment of the article, wherein the bondcoat defines a plurality of channels and a plurality of ridges that interlock within a plurality of channels formed in the at least one outer layer to physically interlock the at least one outer layer with the bondcoat through the constituent layer and the ridges have a height of from about 50 to about 200 μm, a wavelength of from about 250 to about 1,000 μm, a ratio of a span of each ridge to the wavelength of the ridges of about 0.2 to about 0.8 and a thickness of the constituent layer is between about 4 to about 40 μm.