Invention Grant
- Patent Title: Ion exchanged glasses via non-error function compressive stress profiles
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Application No.: US15640726Application Date: 2017-07-03
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Publication No.: US11492291B2Publication Date: 2022-11-08
- Inventor: Dana Craig Bookbinder , Richard Michael Fiacco , Timothy Michael Gross , Stephan Lvovich Logunov
- Applicant: CORNING INCORPORATED
- Applicant Address: US NY Corning
- Assignee: CORNING INCORPORATED
- Current Assignee: CORNING INCORPORATED
- Current Assignee Address: US NY Corning
- Agent Jeffrey A. Schmidt
- Main IPC: C03C21/00
- IPC: C03C21/00 ; C03C23/00

Abstract:
Glasses with compressive stress profiles that allow higher surface compression and deeper depth of layer (DOL) than is allowable in glasses with stress profiles that follow the complementary error function at a given level of stored tension. In some instances, a buried layer or local maximum of increased compression, which can alter the direction of cracking systems, is present within the depth of layer. Theses compressive stress profiles are achieved by a three step process that includes a first ion exchange step to create compressive stress and depth of layer that follows the complimentary error function, a heat treatment at a temperature below the strain point of the glass to partially relax the stresses in the glass and diffuse larger alkali ions to a greater depth, and a re-ion-exchange at short times to re-establish high compressive stress at the surface.
Public/Granted literature
- US20170297956A1 ION EXCHANGED GLASSES VIA NON-ERROR FUNCTION COMPRESSIVE STRESS PROFILES Public/Granted day:2017-10-19
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