Glass ceramic having a low thermal expansion

Details Glass ceramic having a low thermal expansion Glass ceramic having a low thermal expansion

2007-05-22

2007-05-22

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

C501S007000, C065S033500, C065S033600, C065S061000

Reexamination Certificate

active

11052581

ABSTRACT:
The present invention relates to a novel glass ceramic having a low or small average thermal expansion together with good polishability and processability, to the use of the glass ceramic according to the invention, and to optical components made of the glass ceramic. In particular, a glass ceramic is provided which comprises the following composition (in % by weight based on oxide):SiO250–70Al2O317–32P2O5 3–12Li2O2.5–5  Na2O0–2K2O0–2MgO0–2CaO0.1–4  BaO  0–<1SrO0–2ZnO0–4TiO21.5–5  ZrO2 0–2.5.

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