A coated component, along with methods of making and using the same, is provided. The coated component includes a ceramic matrix composite (CMC) substrate comprising silicon carbide and having a surface; a mullite/NOSC bondcoat on the surface of the substrate; and an environmental barrier coating on the mullite/NOSC bondcoat. The mullite/NOSC bondcoat comprises a non-oxide silicon ceramic (NOSC) phase contained within a mullite phase, with the mullite/NOSC bondcoat comprising 60% to 95% by volume of the mullite phase, such as 65% to 93% by volume of the mullite phase.

A coated component, along with methods of making and using the same, is provided. The coated component includes a ceramic matrix composite (CMC) substrate comprising silicon carbide and having a surface; a mullite/NOSC bondcoat on the surface of the substrate; and an environmental barrier coating on the mullite/NOSC bondcoat. The mullite/NOSC bondcoat comprises a non-oxide silicon ceramic (NOSC) phase contained within a mullite phase, with the mullite/NOSC bondcoat comprising 60% to 95% by volume of the mullite phase, such as 65% to 93% by volume of the mullite phase.

An article that includes a substrate; a first layer including yttria and zirconia or hafnia, where the first layer has a columnar microstructure and includes predominately the zirconia or hafnia; a second layer on the first layer, the second layer including zirconia or hafnia, ytterbia, samaria, and at least one of lutetia, scandia, ceria, neodymia, europia, and gadolinia, where the second layer includes predominately zirconia or hafnia, and where the second layer has a columnar microstructure; and a third layer on the second layer, the third layer including zirconia or hafnia, ytterbia, samaria, and a rare earth oxide including at least one of lutetia, scandia, ceria, neodymia, europia, and gadolinia, where the third layer has a dense microstructure and has a lower porosity than the second layer.

An article that includes a substrate; a first layer including yttria and zirconia or hafnia, where the first layer has a columnar microstructure and includes predominately the zirconia or hafnia; a second layer on the first layer, the second layer including zirconia or hafnia, ytterbia, samaria, and at least one of lutetia, scandia, ceria, neodymia, europia, and gadolinia, where the second layer includes predominately zirconia or hafnia, and where the second layer has a columnar microstructure; and a third layer on the second layer, the third layer including zirconia or hafnia, ytterbia, samaria, and a rare earth oxide including at least one of lutetia, scandia, ceria, neodymia, europia, and gadolinia, where the third layer has a dense microstructure and has a lower porosity than the second layer.

Methods for preparing an environmental barrier coating and the resulting coating are provided. The methods and products include the incorporation of a continuous ceramic inner layer and a segmented ceramic outer layer on a CMC component. The segmented ceramic outer layer may be formed by thermal spray techniques. The coating is more stable at higher temperatures and provides for a longer lifetime of the coated component.

Methods for preparing an environmental barrier coating and the resulting coating are provided. The methods and products include the incorporation of a continuous ceramic inner layer and a segmented ceramic outer layer on a CMC component. The segmented ceramic outer layer may be formed by thermal spray techniques. The coating is more stable at higher temperatures and provides for a longer lifetime of the coated component.

A ceramic material which contains yttrium oxide as the stabilizer and at least one of the materials erbium oxide or ytterbium oxide provides a phase having sintering stability for a ceramic material for ceramic layers and a ceramic layer system which maintain the mechanical and thermal properties for a long time even when used at high temperatures.

A ceramic material which contains yttrium oxide as the stabilizer and at least one of the materials erbium oxide or ytterbium oxide provides a phase having sintering stability for a ceramic material for ceramic layers and a ceramic layer system which maintain the mechanical and thermal properties for a long time even when used at high temperatures.

A coated member includes a heat-shielding coating layer made of a zirconia-dispersed silicate in which ytterbia-stabilized zirconia is precipitated as a dispersed phase in a matrix phase which is any one of a rare earth disilicate, a rare earth monosilicate, and a mixed phase of the rare earth disilicate and the rare earth monosilicate. The rare earth disilicate is a (Y.sub.1-a[Ln.sub.1].sub.a).sub.2Si.sub.2O.sub.7 solid solution wherein Ln.sub.1 is any one of Sc, Yb, and Lu, or a (Y.sub.1-c[Ln.sub.2].sub.c).sub.2Si.sub.2O.sub.7 solid solution wherein Ln.sub.2 is any one of Nd, Sm, Eu, and Gd. The rare earth monosilicate is Y.sub.2SiO.sub.5, [Ln.sub.1].sub.2SiO.sub.5, a (Y.sub.1-b[Ln.sub.1]b).sub.2SiO.sub.5 solid solution wherein Ln.sub.1 is any one of Sc, Yb, and Lu, or a (Y.sub.1-d[Ln.sub.2].sub.d).sub.2SiO.sub.5 solid solution wherein Ln.sub.2 is any one of Nd, Sm, Eu, and Gd.

A coated member includes a heat-shielding coating layer made of a zirconia-dispersed silicate in which ytterbia-stabilized zirconia is precipitated as a dispersed phase in a matrix phase which is any one of a rare earth disilicate, a rare earth monosilicate, and a mixed phase of the rare earth disilicate and the rare earth monosilicate. The rare earth disilicate is a (Y.sub.1-a[Ln.sub.1].sub.a).sub.2Si.sub.2O.sub.7 solid solution wherein Ln.sub.1 is any one of Sc, Yb, and Lu, or a (Y.sub.1-c[Ln.sub.2].sub.c).sub.2Si.sub.2O.sub.7 solid solution wherein Ln.sub.2 is any one of Nd, Sm, Eu, and Gd. The rare earth monosilicate is Y.sub.2SiO.sub.5, [Ln.sub.1].sub.2SiO.sub.5, a (Y.sub.1-b[Ln.sub.1]b).sub.2SiO.sub.5 solid solution wherein Ln.sub.1 is any one of Sc, Yb, and Lu, or a (Y.sub.1-d[Ln.sub.2].sub.d).sub.2SiO.sub.5 solid solution wherein Ln.sub.2 is any one of Nd, Sm, Eu, and Gd.