This makes it possible to increase the resistance of a an of alumino silicate - lithium by modifying the surface, vitro - ceramic obtained according to this process and its use

摘要

The present invention relates to a method aiming to increase the mechanical strength of a vitroceramic of alumino silicate - lithium, a process in which it covers the surface of the glass raw state, before the ceramisization, with a solution or a suspension of a lithium salt or an organic compound capable of decomposing, during ceramisation, giving a lithium salt, which lithium salt has a melting point of at least 720 degrees c, then is dried, the coating thus obtained, these operations are repeated at the required coating and drying, until the layer thus deposited on the surface of the glass contains from 10 to 5000 mg / m 2 of lithium ions, and is converted into a ceramic the glass mixture thus revêtu.l' invention also relates to a vitroceramic obtained according to this process, whose surface has a mechanical strength of greater than that of the surface of a vitroceramic produced without its surface has undergone an ion exchange with ions of lithium.l' invention also relates to the use of such a in the glass-ceramic cooking plates.