Eurokera

Tiphaine Ogier

Marie J Comte

Marie Comte

The present application provides LAS type transparent glass-ceramics of &#x3b2;-quartz of composition containing a high content of zinc, articles constituted at least in part of said glass-ceramics, glasses precursors of said glass-ceramics (with a low viscosity at high temperature), and also a method of preparing said articles. Said glass-ceramics present a composition, free of arsenic oxide and antimony oxide, except for inevitable traces, expressed as percentages by weight of oxides, containing: 64.5% to 66.5% of SiO; 19.0% to 20.6% of AlO; 3.0% to 3.6% of LiO; 0 to 1% of MgO; 1.7% to 3.4% of ZnO; 2% to 3% of BaO; 0 to 3% of SrO; 0 to 1% of CaO; 2% to 4% of TiO; 1% to 2% of ZrO; 0 to 1% of NaO; 0 to 1% of KO; with NaO+KO+BaO+SrO+CaO&#x2264;6%; optionally up to 2% of at least one fining agent comprising SnO; and optionally up to 2% of at least one coloring agent.

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Paris, France

Tiphaine Ogier