Alkali-free aluminosilicate glasses, suitable as substrate for induction heating cooktops applications
AssigneeEurokera
InventorsMarie Jacqueline Monique Comte, Philippe Lehuede
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Abstract
Aluminosilicate glasses whose composition is free of alkali metals and contain, as a weight percentage of oxides, 60 to 70% SiO2, 13 to 22% Al2O3, 0 to 9% B2O3, 1 to 6% MgO, 0 to 5% CaO, 1 to 5% BaO, 2 to 12% ZnO, and 0 to 3% SrO, wherein Al2O3+B2O3+ZnO>23% and B2O3+MgO−CaO−BaO−SrO<6%. The glasses exhibit a low coefficient of thermal expansion (CTE) and strong acid and alkali durabilities, and may be used in substrates for induction cooktops.
Claims11
A non-crystalline aluminosilicate glass whose composition is free, with the exception of inevitable traces, of alkali metals and contains, expressed as a weight percentage of oxides:
- 60 to 70% SiO2
- 13 to 22% Al2O3
- 0 to 9% B2O3
- 1 to 6% MgO
- 0 to 5% CaO
- 1 to 5% BaO
- 2 to 12% ZnO, and
- 0 to 3% SrO;
- wherein
- Al2O3+B2O3+ZnO>23%, and
- B2O3+MgO−CaO−BaO−SrO<6%, wherein the composition is free of TiO2.
Dependencies are inferred from the claim text.