An environmental barrier coating, comprising a substrate containing silicon; an environmental barrier layer applied to said substrate; said environmental barrier layer comprising a rare earth composition.

The present disclosure provides a method for coating a composite structure, comprising forming a first slurry by combining a first pre-slurry composition with a first carrier fluid, applying the first slurry on a surface of the composite structure, and heating the composite structure to a temperature sufficient to form a base layer on the composite structure. The first pre-slurry composition may comprise a first phosphate glass composition and a low coefficient of thermal expansion material, wherein the low coefficient of thermal expansion material is a material with a coefficient of thermal expansion of less than 1010.sup.6 C.

The present disclosure provides a method for coating a composite structure, comprising forming a first slurry by combining a first pre-slurry composition with a first carrier fluid, applying the first slurry on a surface of the composite structure, and heating the composite structure to a temperature sufficient to form a base layer on the composite structure. The first pre-slurry composition may comprise a first phosphate glass composition and a low coefficient of thermal expansion material, wherein the low coefficient of thermal expansion material is a material with a coefficient of thermal expansion of less than 1010.sup.6 C.

This application relates to a treating method for magnesium oxysulfate cement (MOS) or magnesium oxychloride cement (MOC) articles. The MOS or MOC article is molded, cured and dried, then the article is treated in water soluble phosphate solution for periods of 0.5 to 90 minutes. When the MOS or MOC article is treated in water soluble phosphate solution, phosphate can penetrate into MOS or MOC article, react with the non-active magnesia remaining in MOS or MOC article to form magnesium phosphate cement (MPC). After such treatment, MOS or MOC phase is bonded by magnesium phosphate cement (MPC), many defects for MOS or MOC article, such as cracks, distortion, chalking, effloresce, poor durability, and so on, can be reduced or eliminated.

This application relates to a treating method for magnesium oxysulfate cement (MOS) or magnesium oxychloride cement (MOC) articles. The MOS or MOC article is molded, cured and dried, then the article is treated in water soluble phosphate solution for periods of 0.5 to 90 minutes. When the MOS or MOC article is treated in water soluble phosphate solution, phosphate can penetrate into MOS or MOC article, react with the non-active magnesia remaining in MOS or MOC article to form magnesium phosphate cement (MPC). After such treatment, MOS or MOC phase is bonded by magnesium phosphate cement (MPC), many defects for MOS or MOC article, such as cracks, distortion, chalking, effloresce, poor durability, and so on, can be reduced or eliminated.

The present disclosure provides a method for coating a composite structure, comprising forming a first slurry by combining a first pre-slurry composition with a first carrier fluid, applying the first slurry on a surface of the composite structure, and heating the composite structure to a temperature sufficient to form a base layer on the composite structure. The first pre-slurry composition may comprise a first phosphate glass composition and a low coefficient of thermal expansion material, wherein the low coefficient of thermal expansion material is a material with a coefficient of thermal expansion of less than 1010.sup.6 C..sup.1.

The present disclosure provides a method for coating a composite structure, comprising forming a first slurry by combining a first pre-slurry composition with a first carrier fluid, applying the first slurry on a surface of the composite structure, and heating the composite structure to a temperature sufficient to form a base layer on the composite structure. The first pre-slurry composition may comprise a first phosphate glass composition and a low coefficient of thermal expansion material, wherein the low coefficient of thermal expansion material is a material with a coefficient of thermal expansion of less than 1010.sup.6 C..sup.1.

A heat curable aqueous composition comprising: (a) water; (b) at least 5 wt % sodium pyrophosphate, at least 5 wt % sodium phosphate monobasic, at least 5 wt % sodium triphosphate, at least 5 wt % monoammonium phosphate, at least 5 wt % diammonium phosphate, or at least 5 wt % of a mixture thereof, based on the total weight of the composition including the weight of the water; and (c) at least one pigment, or at least one metal-containing ingredient, or a mixture of at least one pigment and at least one metal-containing ingredient.

A coated building article comprising a fiber cement cladding element may be coated with a system designed to achieve a desired appearance. The coating system may comprise a first coating layer and a second coating layer wherein the second coating layer comprises at least one layer of a low gloss coating composition which has a light reflectance of 5% or less when light is shone onto the surface of the coated article at an angle of 60? or 85? to the surface is positioned on at least a portion of the front face of the fiber cement cladding element. Also provided is a method of coating the building article with a low gloss coating composition.

A coated building article comprising a fiber cement cladding element may be coated with a system designed to achieve a desired appearance. The coating system may comprise a first coating layer and a second coating layer wherein the second coating layer comprises at least one layer of a low gloss coating composition which has a light reflectance of 5% or less when light is shone onto the surface of the coated article at an angle of 60? or 85? to the surface is positioned on at least a portion of the front face of the fiber cement cladding element. Also provided is a method of coating the building article with a low gloss coating composition.