An article may include a substrate defining at least one at least partially obstructed surface. The substrate includes at least one of a ceramic or a ceramic matrix composite. The article also may include a multilayer, multi-microstructure environmental barrier coating on the at least partially obstructed substrate. The multilayer, multi-microstructure environmental barrier coating includes a first layer comprising a rare earth disilicate and a substantially dense microstructure; and a second layer on the first layer. The second layer includes a columnar microstructure and at least one of a rare earth monosilicate or a thermal barrier coating composition comprising a base oxide comprising zirconia or hafnia; a primary dopant comprising ytterbia; a first co-dopant comprising samaria; and a second co-dopant comprising at least one of lutetia, scandia, ceria, gadolinia, neodymia, or europia.

A ceramic member is produced by performing a laser treatment on a ceramic substrate as a pretreatment for a surface treatment such that grooves that can be substantially uniformly filled with a surface treatment material are formed in the surface of the ceramic substrate. Through laser irradiation of the surface grooves with recessed surfaces formed to extend in at least one direction are provided. Flat surfaces are formed at areas between the grooves that are adjacent to each other. Pitches between the adjacent grooves are set to a range of 0.05 mm to 0.30 mm. One of the grooves has a width that progressively decreases as the depth increases and is opened on one side in the depth direction at a maximum width. The one of the grooves has an aspect ratio in a range of 0.5 to 1.3 and an opening ratio of equal to or greater than 70%.

A ceramic member is produced by performing a laser treatment on a ceramic substrate as a pretreatment for a surface treatment such that grooves that can be substantially uniformly filled with a surface treatment material are formed in the surface of the ceramic substrate. Through laser irradiation of the surface grooves with recessed surfaces formed to extend in at least one direction are provided. Flat surfaces are formed at areas between the grooves that are adjacent to each other. Pitches between the adjacent grooves are set to a range of 0.05 mm to 0.30 mm. One of the grooves has a width that progressively decreases as the depth increases and is opened on one side in the depth direction at a maximum width. The one of the grooves has an aspect ratio in a range of 0.5 to 1.3 and an opening ratio of equal to or greater than 70%.

A ceramic material, in particular for use in a layer system, which has high resistance to sintering, high expansion tolerance and low thermal conductivity and is provided by deliberately choosing the additions of oxides to zirconium oxide.

A ceramic material, in particular for use in a layer system, which has high resistance to sintering, high expansion tolerance and low thermal conductivity and is provided by deliberately choosing the additions of oxides to zirconium oxide.

An article may include a substrate and a coating system on the substrate. The coating system may include an environmental barrier coating (EBC) layer and a CMAS resistant layer on the EBC layer (e.g., as the top coat of the system). The CMAS layer includes a rare-earth (RE) monosilicate composition including a plurality of RE metal cations, wherein RE monosilicate composition is configured to react with CMAS to form a reaction product including a RE apatite phase with a RE.sub.2O.sub.3.SiO.sub.2 composition, wherein the RE of the RE.sub.2O.sub.3.SiO.sub.2 composition includes at least one of the plurality of RE metal cations of the RE monosilicate.

An article may include a substrate and a coating system on the substrate. The coating system may include an environmental barrier coating (EBC) layer and a CMAS resistant layer on the EBC layer (e.g., as the top coat of the system). The CMAS layer includes a rare-earth (RE) monosilicate composition including a plurality of RE metal cations, wherein RE monosilicate composition is configured to react with CMAS to form a reaction product including a RE apatite phase with a RE.sub.2O.sub.3.SiO.sub.2 composition, wherein the RE of the RE.sub.2O.sub.3.SiO.sub.2 composition includes at least one of the plurality of RE metal cations of the RE monosilicate.

Provided are a coated member in which damage of a coating film can be suppressed in a high temperature environment and the coating may be performed at low cost, and a method of manufacturing the same. A coated member includes a bond coat and a top coat sequentially laminated on a substrate made of a Si-based ceramic or a SiC fiber-reinforced SiC matrix composite, wherein the top coat includes a layer composed of a mixed phase of a (Y.sub.1-aLn.sub.1a).sub.2Si.sub.2O.sub.7 solid solution (here, Ln.sub.1 is any one of Nd, Sm, Eu, and Gd) and Y.sub.2SiO.sub.5 or a (Y.sub.1-bLn.sub.1′b).sub.2SiO.sub.5 solid solution (here, Ln.sub.1′ is any one of Nd, Sm, Eu, and Gd), or a mixed phase of a (Y.sub.1-cLn.sub.2c).sub.2Si.sub.2O.sub.7 solid solution (here, Ln.sub.2 is any one of Sc, Yb, and Lu) and Y.sub.2SiO.sub.5 or a (Y.sub.1-dLn.sub.2′d).sub.2SiO.sub.5 solid solution (here, Ln.sub.2′ is any one of Sc, Yb, and Lu).

Provided are a coated member in which damage of a coating film can be suppressed in a high temperature environment and the coating may be performed at low cost, and a method of manufacturing the same. A coated member includes a bond coat and a top coat sequentially laminated on a substrate made of a Si-based ceramic or a SiC fiber-reinforced SiC matrix composite, wherein the top coat includes a layer composed of a mixed phase of a (Y.sub.1-aLn.sub.1a).sub.2Si.sub.2O.sub.7 solid solution (here, Ln.sub.1 is any one of Nd, Sm, Eu, and Gd) and Y.sub.2SiO.sub.5 or a (Y.sub.1-bLn.sub.1′b).sub.2SiO.sub.5 solid solution (here, Ln.sub.1′ is any one of Nd, Sm, Eu, and Gd), or a mixed phase of a (Y.sub.1-cLn.sub.2c).sub.2Si.sub.2O.sub.7 solid solution (here, Ln.sub.2 is any one of Sc, Yb, and Lu) and Y.sub.2SiO.sub.5 or a (Y.sub.1-dLn.sub.2′d).sub.2SiO.sub.5 solid solution (here, Ln.sub.2′ is any one of Sc, Yb, and Lu).

The disclosure describes articles and techniques that include an airfoil having a hybrid coating system to provide improved particle impact resistance and improve CMAS attack resistance on the pressure side of the airfoil and improved thermal load protection on the suction side of the airfoil. An example article for a gas turbine engine may include a substrate, and a hybrid environmental barrier coating (EBC) including a relatively dense EBC layer on a first portion of the substrate and a relatively porous EBC layer on a second portion of the substrate, where the first portion of the substrate is different from the second portion of the substrate, and wherein at least a portion of the relatively porous EBC layer overlaps at least a portion of the relatively dense EBC layer in an overlap region.