A process for the increase in strength of lithium - - - have a silicate glass ceramic by surface modification and prepared by this process lithium silicate glass ceramic - - - have

摘要

A process for increasing the strength of a lithium silicate - - - have glass ceramic by surface modification, characterized by the following steps:– the surface of the green glass, before the ceramizing with a solution or suspension of a lithium salt or a during the ceramizing decomposable organic compound to a lithium salt coated,– the lithium salt has a melting point of at least 720°C,– the coating is dried,– Coating and drying are, if necessary, repeated,– to the layer produced on the glass surface a li⁺-Ion content of 10 to 5000 mg of li⁺/m² has,– the coated green glass is ceramicized.