REINFORCED GLASS-CERAMIC ARTICLE AND ENAMEL ADAPTED FOR COATING SAME

摘要

The invention relates to a method for reinforcing a glass-ceramic article that comprises inducing a maximum of stress under the surface of the glass-ceramic in the vicinity of said surface. The invention also relates to an enamel used for said reinforcement, wherein said enamel comprises sintered glass of the following formula, with the proportions in weight percent: SiO2 50 - 66 %, MgO 3 - 8 %, Na2O 7 - 15 %, K2O 0 - 3 %, Li2O 0 - 12 %, CaO 0 - 10 %, BaO 0 - 15%, AI2O3 O - 3 %, ZrO2 O - 3 %, ZnO O - 5 %, B2O3 O - 8 %, the sum of the alkaline earth oxides CaO + BaO ranging from 8 to 15 %, and the sum of the alkaline oxides Na2O + K2O + Li2O ranging from 7 to 20 %. The invention further relates to reinforced glass-ceramics thus obtained.