公开(公告)号：US20240327278A1

公开(公告)日：2024-10-03

申请号：US18744035

申请日：2024-06-14

Applicant: CORNING INCORPORATED

Inventor： Rebecca Vernon Higginbottom ,  Weirong Jiang ,  Sean Thomas Miller

IPC: C03C21/00 ,  C03C23/00

CPC classification number: C03C21/002 ,  C03C23/007

Abstract: A method of strengthening glass articles includes introducing potassium ions to a surface region of the glass by an initial ion-exchange process, thermally treating the glass at a thermal treatment temperature and time sufficient to diffuse the potassium ions further into the glass to a depth of layer, and introducing a compressive stress of greater than 400 MPa at the surface through a final ion-exchange process. The final ion-exchange process may be conducted at a final ion-exchange temperature of no more than 450° C. The method of strengthening produces a glass article having a compressive stress of at least 400 MPa at the surface, a depth of compression of at least 30 μm, and a central tension less than a threshold central tension above which flaws penetrating into the central region of the glass exhibit spontaneous self-propagation of the flaw front through and across the glass.

公开(公告)号：US12037282B2

公开(公告)日：2024-07-16

申请号：US16599282

申请日：2019-10-11

Applicant: CORNING INCORPORATED

Inventor： Rebecca Vernon Higginbottom ,  Weirong Jiang ,  Sean Thomas Miller

IPC: C03C21/00 ,  C03C23/00

CPC classification number: C03C21/002 ,  C03C23/007

Abstract: A method of strengthening glass articles includes introducing potassium ions to a surface region of the glass by an initial ion-exchange process, thermally treating the glass at a thermal treatment temperature and time sufficient to diffuse the potassium ions further into the glass to a depth of layer, and introducing a compressive stress of greater than 400 MPa at the surface through a final ion-exchange process. The final ion-exchange process may be conducted at a final ion-exchange temperature of no more than 450° C. The method of strengthening produces a glass article having a compressive stress of at least 400 MPa at the surface, a depth of compression of at least 30 μm, and a central tension less than a threshold central tension above which flaws penetrating into the central region of the glass exhibit spontaneous self-propagation of the flaw front through and across the glass.