The present disclosure relates to clay-based articles (e.g., articles of cookware) and methods of making the same.

According to the present invention, there is provided a ceramic product in which damage to a decorative film during washing with an alkali can be reduced. In a ceramic product 1 disclosed here, a decorative film 30 is formed on the surface of a ceramic substrate 10. Here, the decorative film 30 of the ceramic product includes a noble metal region 32 containing a noble metal element as a main component and an amorphous region 34 containing matrix-forming elements containing at least Si as a main component. Here, in the ceramic product 1 disclosed here, crystalline particles 35 containing a crystalline oxide of at least one metal element selected from among the matrix-forming elements as a main component are dispersed in the amorphous region 34. Since such crystalline particles 35 are difficult for alkaline components to penetrate, it is possible to prevent the alkaline components from entering the amorphous region 35 and reduce damage to the decorative film 30 during washing with an alkali.

Ceramic tile having a ceramic base layer and a cover glaze layer including a printed pattern, where the surface of the ceramic tile has a relief having structural features corresponding to the printed pattern. The relief being basically formed as a plurality of excavations present in the generally plane upper surface of the ceramic tile and the structural features have a depth such that they are completely situated above the ceramic base layer.

Ceramic tile having a ceramic base layer and a cover glaze layer including a printed pattern, where the surface of the ceramic tile has a relief having structural features corresponding to the printed pattern. The relief being basically formed as a plurality of excavations present in the generally plane upper surface of the ceramic tile and the structural features have a depth such that they are completely situated above the ceramic base layer.

A method for manufacturing a ceramic tile and an equipment for manufacturing a ceramic tile. A method for manufacturing ceramic tiles (3) that comprises the steps of providing a green tile (2) formed by a mixture of ceramic raw materials, firing said green tile (2) in a kiln (1) to obtain a ceramic tile (3), said kiln (1) being configured to fire the green tile (2) according to a firing cycle defined by one or more firing parameter (HR, MFT, UICR, UIICR, UIIICR, LICR, LIICR, LIIICR), characterized int that it comprises the steps of measuring a shape and/or dimension parameter of the obtained ceramic tile (3), and the step of adjusting the firing parameter on the basis of said measurement, preferably while one parameter is adjustable the remaining parameters are be kept constant.

A method for manufacturing a ceramic tile and an equipment for manufacturing a ceramic tile. A method for manufacturing ceramic tiles (3) that comprises the steps of providing a green tile (2) formed by a mixture of ceramic raw materials, firing said green tile (2) in a kiln (1) to obtain a ceramic tile (3), said kiln (1) being configured to fire the green tile (2) according to a firing cycle defined by one or more firing parameter (HR, MFT, UICR, UIICR, UIIICR, LICR, LIICR, LIIICR), characterized int that it comprises the steps of measuring a shape and/or dimension parameter of the obtained ceramic tile (3), and the step of adjusting the firing parameter on the basis of said measurement, preferably while one parameter is adjustable the remaining parameters are be kept constant.

A preparation method includes: pressing and forming a ceramic base material to obtain a green body of a ceramic plate; applying a ground glaze on the surface of the green body to cover the base color and defects of the green body; applying a cover glaze on the surface of the green body after applying the ground glaze, wherein the cover glaze contains 0.2 wt % to 0.7 wt % of coloring metal oxide to make the coloring bright; roller-printing patterns on the surface of the green body after applying the cover glaze to produce a flowing cloud effect; and drying the green body with the roller-printed patterns and firing in a kiln. The present invention uses roller printing to print the patterns of cloud effect on the surface of the cover glaze, which form a sharp contrast with the color of the cover glaze, producing a better visually distinct effect.

Glazed ceramic material with a low coefficient of thermal expansion to be used as the main raw material (65% to 85%) in porcelain stoneware compositions to manufacture large format sheets (larger than 1.4 m) and also to be used as the main raw material in the manufacture of a glaze (85% to 95%) that will provide the large format sheet with a waterproof, protective and decorative surface. The frit will give the set (body with glaze) a very low coefficient of thermal expansion (hereinafter referred to as CTE). In addition, the resulting ceramic composition can be processed in a conventional ceramics kiln, as aspects such as melt viscosity or adhesion to the rollers have been taken into account during development. As it has a very low CTE, glazed ceramic material can be used as a substitute for glass ceramic material used in the manufacture of induction hobs. This glazed ceramic material can be coloured (both the body and the glaze) and decorated (the glaze), thus adding a new feature to the traditional induction hob.

Glazed ceramic material with a low coefficient of thermal expansion to be used as the main raw material (65% to 85%) in porcelain stoneware compositions to manufacture large format sheets (larger than 1.4 m) and also to be used as the main raw material in the manufacture of a glaze (85% to 95%) that will provide the large format sheet with a waterproof, protective and decorative surface. The frit will give the set (body with glaze) a very low coefficient of thermal expansion (hereinafter referred to as CTE). In addition, the resulting ceramic composition can be processed in a conventional ceramics kiln, as aspects such as melt viscosity or adhesion to the rollers have been taken into account during development. As it has a very low CTE, glazed ceramic material can be used as a substitute for glass ceramic material used in the manufacture of induction hobs. This glazed ceramic material can be coloured (both the body and the glaze) and decorated (the glaze), thus adding a new feature to the traditional induction hob.

Ceramics are capable of reducing color irregularities and uneven coating, hard to dissolve into glaze, and excellent in fixation. A water-based paint contains a coloring material, first cellulose nanofibers having a lignin content of 20 to 40 mass % and a water retention of 150 to 300%, and second cellulose nanofibers having a higher viscosity compared to the first cellulose nanofibers, and the water-based paint has a B-type viscosity of 600 cps or higher. Ceramic ware or glassware or the like having painting made on a green body of which surface is formed of silicic acid or silicate compound as a main component, with the water-based paint.