公开(公告)号：US11505491B2

公开(公告)日：2022-11-22

申请号：US17521910

申请日：2021-11-09

Applicant: AGC Inc.

Inventor： Seiki Ohara ,  Qing Li ,  Shusaku Akiba

IPC: C03C3/097 ,  C03C21/00

Abstract: The present invention relates to a glass ceramic including crystals, and including, in mol % in terms of oxides: 65-75% of SiO2; 3-6% of Al2O3; 15-25% of Li2O; 0.2-4% of P2O5; 0.5-5% of ZrO2; and 0.01-0.5% of HfO2, in which the crystals include one or more kinds of crystals selected from the group consisting of β-spodumene crystals, petalite crystals, and eucryptite crystals.

公开(公告)号：US11028013B2

公开(公告)日：2021-06-08

申请号：US15896639

申请日：2018-02-14

Applicant: AGC Inc.

Inventor： Masao Ozeki ,  Shusaku Akiba ,  Izuru Kashima

IPC: C03C21/00 ,  C03C3/085

Abstract: A chemically strengthened glass has a compressive stress layer formed in a glass surface layer by ion exchange. The compressive stress layer includes at least two types of stress patterns of a stress pattern A close to a glass surface and a stress pattern B on an inner side of the glass. In the stress pattern A, compressive stress increases as going inward from the glass surface. In the stress pattern B, compressive stress decreases as going inward from the glass surface. Depth of compressive stress layer in the stress pattern B is 90 μm or more from the glass surface. Compressive stress α MPa of the glass surface in the stress pattern A and compressive stress β MPa at a point where the stress pattern A and the stress pattern B cross each other satisfy a relation of β>α.

公开(公告)号：US20180327304A1

公开(公告)日：2018-11-15

申请号：US16033787

申请日：2018-07-12

Applicant: AGC Inc.

Inventor： Suguru MURAYAMA ,  Seiki Ohara ,  Qing Li ,  Shusaku Akiba

IPC: C03C3/097 ,  C03C21/00 ,  C03C3/093 ,  C03C3/091 ,  C03C4/18 ,  C03C3/085 ,  C03C3/083 ,  C03C3/087

Abstract: A glass for chemical strengthening contains, in mole percentage on an oxide basis, 58 to 80% of SiO2, 13 to 18% of Al2O3, 0 to 5% of B2O3, 0.5 to 4% of P2O5, 4 to 10% of Li2O, 5 to 14% of Na2O, 0 to 2% of K2O, 0 to 11% of MgO, 0 to 5% of CaO, 0 to 20% of SrO, 0 to 15% of BaO, 0 to 10% of ZnO, 0 to 1% of TiO2, and 0 to 2% of ZrO2. A value of X is 30000 or more. The value of X is calculated based on the formula, X=SiO2×329+Al2O3×786+B2O3×627+P2O5×(−941)+Li2O×927+Na2O×47.5+K2O×(−371)+MgO×1230+CaO×1154+SrO×733+ZrO2×51.8, by using the contents in mole percentage on an oxide basis of components.