초록 ▼

A high rigidity glass-ceramic substrate is provided which contains, as a predominant crystal phase or phases, at least one crystal phase selected from the group consisting of enstatite (MgSiO3), enstatite solid solution (MgSiO3 solid solution), magnesium titanate (MgTi2O) and magnesium titanate soli

A high rigidity glass-ceramic substrate is provided which contains, as a predominant crystal phase or phases, at least one crystal phase selected from the group consisting of enstatite (MgSiO3), enstatite solid solution (MgSiO3 solid solution), magnesium titanate (MgTi2O) and magnesium titanate solid solution (MgTi2O5 solid solution), has fine crystal grains (preferably globular crystal grains) of precipitated crystal phases, has excellent melting property of a base glass, high resistivity to devitrification, easiness in polishing, excellent smoothness in the surface after polishing and has high Young's modulus capable of coping with a high speed rotation.

대표청구항 ▼

1. A high rigidity glass-ceramic substrate having a predominant crystal phase or phases, said predominant crystal phase comprising enstatite (MgSiO3) or enstatite solid solution (MgSiO3 solid solution) as a first crystal phase having the largest ratio of precipitation, and glass-ceramic constituting

1. A high rigidity glass-ceramic substrate having a predominant crystal phase or phases, said predominant crystal phase comprising enstatite (MgSiO3) or enstatite solid solution (MgSiO3 solid solution) as a first crystal phase having the largest ratio of precipitation, and glass-ceramic constituting the glass-ceramic substrate having Young's modulus within a range from 115 GPa to 160 GPa and wherein said glass-ceramic comprises in weight percent on the oxide basis: SiO240-60%MgO10-20%Al2O310% toless than 20%CaO0.5-4%.ensp. SrO0.5-4%.ensp. BaO0.5-5%.ensp. TiO2more than8% to 12%.