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Multi-layer glass sheet made by co-drawing using the overflow downdraw fusion process

A transparent glass and inner layer technology, which is applied in glass forming, glass forming, glass manufacturing equipment, etc., can solve the problems of increasing production cost and time, and existing waste disposal problems

Active Publication Date: 2013-03-13
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are limited by the amount of ion exchange that can be achieved depending on the composition and size of the glass
Additionally, these methods significantly increase production cost and time, require significant additional production space, and present waste disposal issues

Method used

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  • Multi-layer glass sheet made by co-drawing using the overflow downdraw fusion process
  • Multi-layer glass sheet made by co-drawing using the overflow downdraw fusion process
  • Multi-layer glass sheet made by co-drawing using the overflow downdraw fusion process

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Embodiment Construction

[0014] We propose a method of fabricating transparent glass sheets with compressive stress on the surface, wherein the amount of compressive stress in the glass sheet and the thickness of the compressive layer can be easily adjusted for a wide range of compositions, sizes and thicknesses.

[0015] As used herein, the term "transparent" is used to denote a solid material through which at least 80% of the radiant energy in the visible spectrum that passes through the material is transmitted, rather than absorbed or scattered by the material. Particularly preferred transparent materials include those through which at least 95% of the radiant energy in the visible spectrum that passes through the material is transmitted through the material rather than being absorbed or scattered by the material.

[0016] As used herein, the term "in situ crystallization process" means a process in which a thermal treatment regime is applied to a crystallizable formable glass in which the temperatu...

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Abstract

Transparent glass sheets having increased mechanical strength include an inner layer surrounded by surface compressive layers wherein the difference of the coefficient of thermal expansion of the inner layer and the surface compressive layer is greater than 50*10-7 DEG C-1 and wherein the surface compressive layer has a compressive stress of at least about 300 MPa.

Description

[0001] Related Application Cross Reference [0002] This application claims the benefit and priority of U.S. Provisional Patent Application No. 61 / 359409, filed June 29, 2010, entitled "Glass Sheets with Improved Mechanical Strength," the contents of which are The basis of this application is hereby incorporated by reference in its entirety. field of invention [0003] The present invention relates generally to glass sheets, and more particularly to glass sheets having improved mechanical strength. Background technique [0004] It has long been believed that the mechanical strength of a glass article can be significantly increased if the outer surface of the glass is in compression. Strengthening glass by using adjacent glass layers with differences in coefficient of thermal expansion (CTE) has also been investigated. [0005] In addition, it is known that the mechanical strength of a glass sheet can be significantly increased by employing an ion exchange method. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B17/06C03C17/02C03C3/083C03C3/091B32B17/06
CPCC03B17/064C03B17/02C03C3/083C03C17/02C03C3/091C03B17/068Y10T428/2495B32B17/06B32B2307/412C03B17/06C03C3/085C03C3/087C03C3/093
Inventor D·C·布克宾德K·L·豪斯P·坦登
Owner CORNING INC
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