C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
261/1
C03C 10/12 (2006.01) C03C 10/00 (2006.01)
Patent
CA 2299202
A translucent or opaque glass-ceramic containing .beta.-quartz solid solution as the predominant crystal phase, having a composition (in % by weight) of Li2O 3-5, Na2O 0-1, K20 0-1, Na2O + K2O 0.2-2, MgO 0-1.8, BaO 0-3.5, SrO 0-1, CaO 0-1, BaO + SrO + CaO 0.2-4, ZnO 0-2.8, Al2O3 17-26, SiO2 62-72, TiO2 0-2.5, ZrO2 0-3, TiO2 + ZrO2 1- <3.5, Sb2O3 0-2, As2O3 0-2, SnO 0-<1, and P2O5 0-8, an average coefficient of linear thermal expansion .alpha.20-700°C of <0.5~10 -6/K, an average crystal size of the .beta.- quartz solid solution of ~ 80 nm, and a transmission (sample thickness 4 mm) ~380-780 nm of < 30%. The glass-ceramic may be preferably used as a heatable plate for cooking and grilling, as a cooking utensil, as a stove window, and/or as a base plate for microwave ovens.
Mitra Ina
Rudinger Bernd
Schonberger Klaus
Schultheis Bernd
Siebers Friedrich
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Glas Schott
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