Abstract: The present invention relates to a glass-ceramic article comprising at least one substrate, such as a plate, made of glass-ceramic, said substrate being coated in at least one area with at least one enamel coating such that: 1) the enamel has a gloss at 60° of less than 40, 2) the coverage rate of said enamel in said area coated with said coating is 40 to 80%, 3) said enamel comprises pigments in the form of mica and/or aluminum oxide and/or silica particles coated with metal oxides or combinations of metal oxides, 4) said enamel has a roughness Ra greater than or equal to 0.4 ?m, 5) said enamel has a roughness Rt greater than 4 ?m.

Abstract: The present invention relates to a glass-ceramic article comprising at least one substrate, such as a plate, made of glass-ceramic, said substrate being coated in at least one area with at least one enamel coating such that: 1) said enamel has a gloss at 60° of less than 40, 2) the coverage rate of said enamel in said area coated with said coating is 40 to 80%, 3) said enamel preferably: 3a) is free of pigments in the form of mica or aluminum oxide or silica particles coated with metal oxides or combinations of metal oxides, and 3b) has a roughness Ra greater than or equal to 0.4 ?m and/or a luminosity L* greater than 50.

Abstract: The present invention relates to a glass-ceramic article at least partly coated with at least one layer of an enamel formed from a glass frit having the following composition, the proportions being expressed as weight percentages: SiO2 50-66% and preferably 50 < SiO2 ? 65% MgO 3-8% and preferably 3-6% Na2O 7-15% K2O ?3% Li2O ?3%, in particular ?2% CaO ?1% BaO >0-15% and preferably 5-15% Al2O3 3-20% and preferably 3 < Al2O3 < 20% ZrO2 0-4%, preferably 0 < ZrO2 < 4%, in particular 0.5-2% ZnO >0-5% B2O3 >0-6% and preferably 0 < B2O3 ? 5% the sum of the alkaline-earth metal oxides CaO+BaO moreover being between 8 and 15%, and the sum of the alkali metal oxides Na2O+K2O+Li2O moreover being between 7 and 20%. The invention also relates to the reinforced glass-ceramics obtained.

Abstract: Enamel composition, in particular intended for covering a glass pane of a fireplace insert, comprising at least one glass frit, at least one pigment in a content varying from 40 to 65% of the total weight of the enamel, preferably from 45 to 60%, and optionally at least one vehicle or medium, characterized in that the glass frit comprises the following constituents, within the limits defined below, limits included, expressed as percentages by weight of the total weight of the frit: SiO2 45-65%? Al2O3 0-13% B2O3 23-55%? Na2O 0-10% K2O 0-10% Li2O ?0-10%.

Abstract: A glass-ceramic plate for covering or accommodating at least one heating element, wherein the plate is at least partly coated with at least one nanoscale layer based on a metallic material having a refractive index greater than the refractive index of the glass-ceramic.

Abstract: The present invention relates to a glass-ceramic article at least partly coated with at least one layer of an enamel formed from a glass frit having the following composition, the proportions being expressed as weight percentages: SiO2 50-66% and preferably 50 < SiO2 ? 65% MgO 3-8% and preferably 3-6% Na2O 7-15% K2O ?3% Li2O ?3%, in particular ?2% CaO ?1% BaO >0-15% and preferably 5-15% Al2O3 3-20% and preferably 3 < Al2O3 < 20% ZrO2 0-4%, preferably 0 < ZrO2 < 4%, in particular 0.5-2% ZnO >0-5% B2O3 >0-6% and preferably 0 < B2O3 ? 5% the sum of the alkaline-earth metal oxides CaO+BaO moreover being between 8 and 15%, and the sum of the alkali metal oxides Na2O+K2O+Li2O moreover being between 7 and 20%. The invention also relates to the reinforced glass-ceramics obtained.

Abstract: A process for reinforcing a glass-ceramic article, into which a maximum tension is introduced beneath the surface of the glass-ceramic, advantageously in proximity to said surface. The invention also relates to an enamel that can be used for this reinforcement, this enamel being formed from a glass frit having the following composition, the proportions being expressed as weight percentages: SiO2 50-66% MgO 3-8% Na2O ?7-15% K2O 0-3% Li2O ?0-12% CaO ?0-10% BaO ?0-15% Al2O3 0-3% ZrO2 0-3% ZnO 0-5% B2O3 0-8% the sum of the alkaline-earth metal oxides CaO+BaO moreover being between 8 and 15%, and the sum of the alkali metal oxides Na2O+K2O+Li2O moreover being between 7 and 20%. The reinforced glass-ceramics obtained by the process.

Abstract: The present invention relates to a process for reinforcing a glass-ceramic article, into which a maximum tension is introduced beneath the surface of the glass-ceramic, advantageously in proximity to said surface. The invention also relates to an enamel that can be used for this reinforcement, this enamel being formed from a glass frit having the following composition, the proportions being expressed as weight percentages: SiO2 50-66% MgO 3-8% Na2O ?7-15% K2O 0-3% Li2O ?0-12% CaO ?0-10% BaO ?0-15% Al2O3 0-3% ZrO2 0-3% ZnO 0-5% B2O3 0-8% the sum of the alkaline-earth metal oxides CaO+BaO moreover being between 8 and 15%, and the sum of the alkali metal oxides Na2O+K2O+Li2O moreover being between 7 and 20%. The invention also relates to the reinforced glass-ceramics obtained.

Abstract: A process for reinforcing a glass-ceramic article, into which a maximum tension is introduced beneath the surface of the glass-ceramic, advantageously in proximity to said surface. The invention also relates to an enamel that can be used for this reinforcement, this enamel being formed from a glass frit having the following composition, the proportions being expressed as weight percentages: SiO2 50-66%? MgO 3-8% Na2O 7-15%? K2O 0-3% Li2O 0-12%? CaO 0-10%? BaO 0-15%? Al2O3 0-3% ZrO2 0-3% ZnO 0-5% B2O3 0-8% the sum of the alkaline-earth metal oxides CaO+BaO moreover being between 8 and 15%, and the sum of the alkali metal oxides Na2O+K2O+Li2O moreover being between 7 and 20%. The reinforced glass-ceramics obtained by the process.

Abstract: Enamel composition, in particular intended for covering a glass pane of a fireplace insert, comprising at least one glass frit, at least one pigment in a content varying from 40 to 65% of the total weight of the enamel, preferably from 45 to 60%, and optionally at least one vehicle or medium, characterized in that the glass frit comprises the following constituents, within the limits defined below, limits included, expressed as percentages by weight of the total weight of the frit: SiO2 45-65%? Al2O3 0-13% B2O3 23-55%? Na2O 0-10% K2O 0-10% Li2O ?0-10%.

Abstract: The present invention relates to a glass-ceramic plate intended for example to cover or accommodate at least one heating element, in particular intended to serve as a hob, said plate being at least partly coated with at least one nanoscale layer based on a metallic material having a refractive index greater than that of the glass-ceramic. The invention also relates to the process for manufacturing the plate, to the screen-printable composition deposited on the plate, and to the cooking appliance comprising said plate.

Abstract: The present invention relates to a process for reinforcing a glass-ceramic article, into which a maximum tension is introduced beneath the surface of the glass-ceramic, advantageously in proximity to said surface. The invention also relates to an enamel that can be used for this reinforcement, this enamel being formed from a glass frit having the following composition, the proportions being expressed as weight percentages: SiO2 50-66%? MgO 3-8% Na2O 7-15%? K2O 0-3% Li2O 0-12%? CaO 0-10%? BaO 0-15%? Al2O3 0-3% ZrO2 0-3% ZnO 0-5% B2O3 0-8% the sum of the alkaline-earth metal oxides CaO+BaO moreover being between 8 and 15%, and the sum of the alkali metal oxides Na2O+K2O+Li2O moreover being between 7 and 20%. The invention also relates to the reinforced glass-ceramics obtained.

Abstract: This composition for treating the surface of a glass-ceramic, especially in plate form, flat glass or hollowware, or glass in the form of fibers, is able to be applied as a thin coating to said glass-ceramic or said glass.