US 12,404,218 B2
Article with surface structures for CMAS resistance
Taylor K. Blair, Indianapolis, IN (US); Ted J. Freeman, Indianapolis, IN (US); and Aaron Sippel, Indianapolis, IN (US)
Assigned to Rolls-Royce Corporation, Indianapolis, IN (US)
Filed by Rolls-Royce Corporation, Indianapolis, IN (US)
Filed on Dec. 30, 2021, as Appl. No. 17/646,551.
Prior Publication US 2023/0212086 A1, Jul. 6, 2023
Int. Cl. C04B 41/50 (2006.01); C04B 35/80 (2006.01); C04B 41/45 (2006.01); C04B 41/87 (2006.01)
CPC C04B 41/5024 (2013.01) [C04B 35/80 (2013.01); C04B 41/459 (2013.01); C04B 41/87 (2013.01); C04B 2235/9669 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An article comprising:
a ceramic or ceramic matrix composite (CMC) substrate; and
a coating on the ceramic or the CMC substrate, wherein the coating defines an outer surface of the article, wherein the coating includes a first portion which does not include surface features and a second portion adjacent to the first portion, the second portion defining a plurality of surface features, the plurality of surface features defining channels on the outer surface of the article, wherein the channels are configured to modify a flow of molten Calcia-Magnesia-Alumina Silicate (CMAS) over the outer surface of the coating in a gas flow over the outer surface of the article to reduce accumulation of the molten CMAS on the outer surface of the article, wherein:
the plurality of surface features includes one or more protrusions protruding out of a surface plane of the coating, wherein the surface plane of the coating is defined by the first portion of the coating, and wherein the one or more protrusions define the channels on the outer surface of the article,
respective channels on the outer surface of the coating are defined by neighboring individual protrusions of the one or more protrusions, and
the respective channels have a ramped surface between the neighboring individual protrusions, wherein the ramped surface is a planar surface and defines a first point and a second point on the planar surface, wherein the first point and the second point are at different distances away from the surface plane of the coating along a line substantially parallel to the gas flow over the outer surface of the article, wherein the ramped surface defines an elevation change in a Z-direction relative to the surface plane of the coating such that the respective channels are recessed into or protrude out of the surface plane of the coating.