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AssigneeEurokera S.N.C.
InventorsStephanie Pelletier, Marie-Helene Chopinet, Caroline Faillat, Marie-Helene Rouillon, Pablo Vilato
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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.
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A reinforced glass-ceramic article, reinforced over at least one region of at least one face, wherein the glass-ceramic has a tensile stress of at least 1.2 MPa at a depth of at least 50 μm, beneath its surface, in at least said region or face.
A process for reinforcing a glass-ceramic article, the process comprising:
Dependencies are inferred from the claim text.