A method for obtaining a porcelain stoneware tile with anti-slip surface includes an enameling step, said step comprising the depositionon the walkable surface of the tileof a mixture of micro-grits added to a usual enamel, most of said micro-grits having dimensions smaller than 60 m and being in a percentage smaller than 25% and preferably smaller than 20% by dry weight of the mixture, the remainder consisting of enamel. Furthermore, a tile with walkable surface layer may be obtained according to the aforementioned method.

The present invention is directed to repair compositions for thermal barrier coatings and methods of use thereof. The repair compositions include a ceramic composition, a colloidal solution, an aqueous binder, an aqueous dispersant, and an aqueous ammonia solution. The ceramic composition includes a first population of yttria-stabilized zirconia particles having a mean diameter from about 250 nm to about 1000 nm, a second population of yttria-stabilized zirconia particles having a mean diameter from about 2 m to about 10 m, and a third population of yttria-stabilized zirconia particles having a mean diameter from about 20 m to about 250 m. One method includes depositing the repair layer onto the damaged region, the repair layer including the repair composition, and heat treating the repair layer.

The present invention is directed to repair compositions for thermal barrier coatings and methods of use thereof. The repair compositions include a ceramic composition, a colloidal solution, an aqueous binder, an aqueous dispersant, and an aqueous ammonia solution. The ceramic composition includes a first population of yttria-stabilized zirconia particles having a mean diameter from about 250 nm to about 1000 nm, a second population of yttria-stabilized zirconia particles having a mean diameter from about 2 m to about 10 m, and a third population of yttria-stabilized zirconia particles having a mean diameter from about 20 m to about 250 m. One method includes depositing the repair layer onto the damaged region, the repair layer including the repair composition, and heat treating the repair layer.

A honeycomb catalyst support structure including a honeycomb body and an outer layer or skin formed of a cement is described. The cement includes an amorphous glass powder with a multimodal particle size distribution applied to an exterior surface of the honeycomb body. The multimodal particle size distribution is achieved through the use of a first glass powder having a first median particle size and at least a second glass powder having a second median particle size. In some embodiments, the first and second glass powders are the same amorphous glass consisting of fused silica. The cement may further include a fine-grained, sub-micron sized silica in the form of colloidal silica. The cement exhibits a coefficient of thermal expansion less than 1510.sup.7/ C., and preferably about 510.sup.7/ C. after drying.

A honeycomb catalyst support structure including a honeycomb body and an outer layer or skin formed of a cement is described. The cement includes an amorphous glass powder with a multimodal particle size distribution applied to an exterior surface of the honeycomb body. The multimodal particle size distribution is achieved through the use of a first glass powder having a first median particle size and at least a second glass powder having a second median particle size. In some embodiments, the first and second glass powders are the same amorphous glass consisting of fused silica. The cement may further include a fine-grained, sub-micron sized silica in the form of colloidal silica. The cement exhibits a coefficient of thermal expansion less than 1510.sup.7/ C., and preferably about 510.sup.7/ C. after drying.

A circumferential coating material contains colloidal silica, silicon carbide, and titanium oxide different in particle diameters from silicon carbide, coats a circumferential surface of a honeycomb structure monolithically formed by extrusion, including as a main component, cordierite having a porosity of 50 to 75%, and forms a circumferential coating layer. A circumferentially coated honeycomb structure has a honeycomb structure comprising latticed porous partition walls defining and forming a plurality of polygonal cells forming through channels and extending from one end face to the other end face, and a circumferential coating layer formed by coating at least a part of a circumferential surface of the honeycomb structure with the circumferential coating material.

A circumferential coating material contains colloidal silica, silicon carbide, and titanium oxide different in particle diameters from silicon carbide, coats a circumferential surface of a honeycomb structure monolithically formed by extrusion, including as a main component, cordierite having a porosity of 50 to 75%, and forms a circumferential coating layer. A circumferentially coated honeycomb structure has a honeycomb structure comprising latticed porous partition walls defining and forming a plurality of polygonal cells forming through channels and extending from one end face to the other end face, and a circumferential coating layer formed by coating at least a part of a circumferential surface of the honeycomb structure with the circumferential coating material.

A method for obtaining a porcelain stoneware tile with anti-slip surface includes an enameling step, said step comprising the depositionon the walkable surface of the tileof a mixture of micro-grits added to a usual enamel, most of said micro-grits having dimensions smaller than 60 m and being in a percentage smaller than 25% and preferably smaller than 20% by dry weight of the mixture, the remainder consisting of enamel. Furthermore, a tile with walkable surface layer may be obtained according to the aforementioned method.