A process for the preparation of a glass-ceramic material with a garnet phase and use of the subsequently produced glass ceramic

摘要

A process for the preparation of a glass ceramic with the following steps:– Melting to a starting glass, the (based on oxide) 5 – 50 w -% sio₂, 5 – 50 W -% al₂O₃ and 10 – 80 w -% of at least one oxide selected from the group, which, by means of a y₂O₃, Sc₂O₃ is formed, as well as 0,1 – 30 w -% of at least one oxide selected from the group, which, by means of a b₂O₃ and oxides of the lanthanides, in addition to lu₂O₃, Gd₂O₃ , and yb₂O₃ is formed, and further comprising 0,1 to 80 w -% of an oxide, which is selected from the group consisting of by lu₂O₃, Gd₂O₃ , and yb₂O₃ is formed;– Heating for ceramization, with a heating rate of at least 10 k / min, preferably by means of infrared heating device, to a temperature in the range of 1000°C. to 1400°C, to form crystallites, which contain a garnet phase,– the heating being for ceramization, up to a first temperature t₁ takes place, these for a first time t₁ is held and is then cooled to room temperature.