Invention Grant
- Patent Title: Glass element with high scratch tolerance
- Patent Title (中): 具有高耐划痕性的玻璃元件
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Application No.: US14249825Application Date: 2014-04-10
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Publication No.: US09371248B2Publication Date: 2016-06-21
- Inventor: Oliver Hochrein , Inge Burger , Irmgard Westenberger , Jochen Alkemper , Gerd Rudas , Katharina Alt , Gordon Kissl , Gunther Paulus
- Applicant: Schott AG
- Applicant Address: DE Mainz
- Assignee: SCHOTT AG
- Current Assignee: SCHOTT AG
- Current Assignee Address: DE Mainz
- Agency: Ohlandt, Greeley, Ruggiero & Perle, LLP
- Priority: DE102013103574 20130410
- Main IPC: C03C3/093
- IPC: C03C3/093 ; C03C21/00

Abstract:
A glass element is provided that is made of a glass having SiO2, Al2O3, B2O3, and Na2O. The glass has a scratch tolerance that when scratches of 1 mm length are introduced using a Knoop diamond indenter which presses upon a surface of the glass with a force of 4 Newton and is displaced along the surface with a traverse speed of 0.4 mm/s, not more than 20% of the scratches have a noticeable width including visible chipping of more than 25 μm. In some embodiments, the glass, after chemical tempering, has sodium ions that are at least partially exchanged for potassium ions so that a compressive stress zone is provided at the surface of the glass. The compressive stress is at least 700 MPa and an exchange depth of alkali ions is at least 25 μm.
Public/Granted literature
- US20140309097A1 GLASS ELEMENT WITH HIGH SCRATCH TOLERANCE Public/Granted day:2014-10-16
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