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US 11,028,015 B2Granted
Glass ball having specific Young's modulus and coefficient of thermal expansion
AssigneeAGC Inc.
InventorsAkio Koike, Makoto Katsuta, Suguru Murayama, Kenji Imakita
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Abstract
A glass ball has a density of 2.3 to 3.2 g/cm3, a Young's modulus of 60 to 150 GPa, and an average coefficient of thermal expansion at 50 to 350° C. being 40×10−7 to 120×10−7/° C. The glass ball is formed of a glass material including, as represented by mole percentage based on oxides, 30 to 75 mol % of SiO2, 2 to 30 mol % of Al2O3, and 5 to 25 mol % of R2O, where R is at least one kind selected from Li, Na and K. The glass ball includes a compressive stress layer in a surface thereof.
Claims10
A glass ball, having:
- a density of 2.3 to 3.2 g/cm3;
- a Young's modulus of 60 to 150 GPa;
- and
- an average coefficient of thermal expansion at 50 to 350° C. being 40×10−7 to 120×10−7/° C.,
- the glass ball being formed of a glass material comprising, as represented by mole percentage based on oxides, 30 to 75 mol % of SiO2, 2 to 30 mol % of Al2O3, and 5 to 25 mol % of R2O, wherein R is at least one kind selected from Li, Na and K, and
- the glass ball comprising a compressive stress layer in a surface thereof.
3 more elements
Dependencies are inferred from the claim text.