A coating according to an exemplary embodiment of this disclosure, among other possible things includes a bond coat including gettering particles and diffusive particles dispersed in a matrix; a top coat disposed over the bond coat, the top coat includes metal silicate particles; and an intermediate layer between the bond coat and the top coat. The intermediate layer includes hafnium silicate particles and matrix. A concentration of metal silicate in the intermediate layer is less than a concentration of metal silicate in the top coat. An article is also disclosed.

A coating according to an exemplary embodiment of this disclosure, among other possible things includes a bond coat including gettering particles and diffusive particles dispersed in a matrix; a top coat disposed over the bond coat, the top coat includes metal silicate particles; and an intermediate layer between the bond coat and the top coat. The intermediate layer includes hafnium silicate particles and matrix. A concentration of metal silicate in the intermediate layer is less than a concentration of metal silicate in the top coat. An article is also disclosed.

A coating according to an exemplary embodiment of this disclosure, among other possible things includes a bond coat including gettering particles and diffusive particles dispersed in a matrix, a top coat disposed over the bond coat, and an intermediate layer between the bond coat and the top coat. The intermediate layer includes non-silicate oxide particles dispersed in a matrix. An article and a method of protecting a ceramic-based substrate are also disclosed.

A coating according to an exemplary embodiment of this disclosure, among other possible things includes a bond coat including gettering particles and diffusive particles dispersed in a matrix, a top coat disposed over the bond coat, and an intermediate layer between the bond coat and the top coat. The intermediate layer includes non-silicate oxide particles dispersed in a matrix. An article and a method of protecting a ceramic-based substrate are also disclosed.

A coated article including an article having a surface; an oxidation resistant bond coat layer deposited on the surface, the oxidation resistant bond coat layer comprising a metal silicide phase, a crystalline ceramic phase and an amorphous ceramic phase, wherein the metal silicide phase has an aspect ratio greater than 1:1 but less than 50:1.

A coated article including an article having a surface; an oxidation resistant bond coat layer deposited on the surface, the oxidation resistant bond coat layer comprising a metal silicide phase, a crystalline ceramic phase and an amorphous ceramic phase, wherein the metal silicide phase has an aspect ratio greater than 1:1 but less than 50:1.

Provided are a coating structure, a turbine part having the same, and a method for manufacturing the coating structure. The coating structure is provided on a surface of a base portion including a ceramic matrix composite. The coating structure is layered on the surface of the base portion, and includes a bond coat layer formed of a rare-earth silicate and a top coat layer layered on the bond coat layer. The residual stress present in the bond coat layer is compressive residual stress. The oxygen permeability coefficient of the bond coat layer is no greater than 10.sup.−9 kg.Math.m.sup.−1.Math.s.sup.−1 at a temperature of not lower than 1200° C. and a higher oxygen partial pressure of not less than 0.02 MPa. The bond coat layer may contain carbonitride particles or carbonitride whiskers.

Provided are a coating structure, a turbine part having the same, and a method for manufacturing the coating structure. The coating structure is provided on a surface of a base portion including a ceramic matrix composite. The coating structure is layered on the surface of the base portion, and includes a bond coat layer formed of a rare-earth silicate and a top coat layer layered on the bond coat layer. The residual stress present in the bond coat layer is compressive residual stress. The oxygen permeability coefficient of the bond coat layer is no greater than 10.sup.−9 kg.Math.m.sup.−1.Math.s.sup.−1 at a temperature of not lower than 1200° C. and a higher oxygen partial pressure of not less than 0.02 MPa. The bond coat layer may contain carbonitride particles or carbonitride whiskers.

A metal oxide composition for use in ceramic bodies to form a ceramic whitener-opacifier composition is disclosed. The metal oxide composition includes one or more crystalline metal oxides or crystalline mixed metal oxides of Al, Ca, Mg, Si and Zr. The metal oxide composition includes at least (i) Al in an amount of from about 5 wt % to about 40 wt % measured as Al2O3, (ii) Ca in an amount of from about 10 wt % to about 30 wt % measured as CaO, (iii) Mg in an amount 5 of from about 0 wt % to about 25 wt % measured as MgO, (iv) Si in an amount of from about 10 wt % to about 25 wt % measured as SiO2, and (v) Zr in an amount of from about 15 wt % to about 35 wt % measured as ZrO.

A metal oxide composition for use in ceramic bodies to form a ceramic whitener-opacifier composition is disclosed. The metal oxide composition includes one or more crystalline metal oxides or crystalline mixed metal oxides of Al, Ca, Mg, Si and Zr. The metal oxide composition includes at least (i) Al in an amount of from about 5 wt % to about 40 wt % measured as Al2O3, (ii) Ca in an amount of from about 10 wt % to about 30 wt % measured as CaO, (iii) Mg in an amount 5 of from about 0 wt % to about 25 wt % measured as MgO, (iv) Si in an amount of from about 10 wt % to about 25 wt % measured as SiO2, and (v) Zr in an amount of from about 15 wt % to about 35 wt % measured as ZrO.