Environmental barrier coating
AssigneeRtx Corporation
InventorsRichard Wesley Jackson, Michael R. Kracum, Xia Tang, James T. Beals
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Abstract
An article includes a ceramic-based substrate and a barrier layer on the ceramic-based substrate. The barrier layer includes a matrix phase and gettering particles in the matrix phase. The gettering particles with an aspect ratio greater than one are aligned such that a maximum dimension of the gettering particles extends along an axis that is generally parallel to the substrate. The barrier layer includes a dispersion of diffusive particles in the matrix phase. A composite material and a method of applying a barrier layer to a substrate are also disclosed.
Claims9
A method of applying a barrier layer to a substrate, comprising:
- mixing diffusive particles, gettering particles, and matrix material, in a carrier fluid to form a slurry, wherein at least a portion of the of the gettering particles have a first dimension defined along a first axis and a second dimension defined along a second axis that is generally perpendicular to the first axis, and wherein the first dimension is at least three times the second dimension, and wherein the portion includes at least 50% of the gettering particles;
- applying the slurry to a substrate;
- aligning the portion of the gettering particles such that the first axis is generally parallel to the substrate, wherein the aligning includes freezing the slurry;
- and
- curing the slurry,
- wherein the diffusive particles include at least one of barium-magnesium alumino-silicate BMAS) particles, barium strontium aluminum silicate particles, magnesium silicate particles, alkaline earth aluminum silicate particles, yttrium aluminum silicate particles, ytterbium aluminum silicate particles, and other rare earth metal aluminum silicate particles,
- wherein the gettering particles include at least one of silicon oxycarbide (SiOC) particles, silicon carbide (SiC) particles, silicon nitride (Si3N4) particles, silicon oxycarbonitride (SiOCN) particles, silicon aluminum oxynitride (SiAION) particles, and silicon boron oxycarbonitride (SiBOCN) particles.
Dependencies are inferred from the claim text.