Crystallizable glass and the use thereof for producing extremely solid and break resistant glass-ceramics having an easily polished surface

摘要

The invention relates to crystallizable aluminosilicate magnesium-containing glass which is used for producing extremely solid and break-resistant glass-ceramics having an easily polished surface. The inventive crystallizable glass contains 5-33 mass % of SiO₂, 25-40 mass % of Al₂O₃, 5-25 mass % of MgO, 0-15 mass % of B₂O₃, 0.1-30 mass % of Y₂O₃, Ln₂O₃, As₂O₃ and/or Nb₂O₅ and 0.1-10 mass % of P₂O₅.