Glass article with improved chemical resistance

A technology of glass products and products, applied in the field of glass products, can solve the problems of limited effect and slowness

Inactive Publication Date: 2010-07-21
AGC FLAT GLASS EUROPE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the effect of this technique is limited over time because Na + and K + Phenomenon of slow diffusion of ions due to concentration gradients formed by depleting these ions close to the surface

Method used

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  • Glass article with improved chemical resistance
  • Glass article with improved chemical resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1 (according to the present invention)

[0048] A piece of transparent soda-lime float glass with a thickness of 4mm and a size of 20cmx20cm was washed with tap water, deionized water and isopropanol in sequence, and finally dried.

[0049] Hydrogen and oxygen are introduced into a spot burner to form a flame at the burner outlet. The surface of the pre-washed glass sheet was placed near the end of the flame. Will contain aluminum nitrate 9 hydrate Al (NO 3 ) 3 9H 2 A solution of O in methanol (aluminum / methanol weight dilution ratio = 1 / 80) was introduced into the flame. Nanoparticles of aluminum oxide are thus generated in the flame, which are then collected on the surface of the glass sheet preheated in a furnace at 650°C. In order to cover the entire surface of the glass sheet, the burner is moved in two spatial directions within the surface of the glass sheet. The burner head moves continuously at a fixed speed of 3 meters per minute in one of the...

Embodiment 2

[0056] Embodiment 2 (according to the present invention)

[0057] A piece of transparent soda-lime float glass with a thickness of 4mm and a size of 20cmx20cm was washed with tap water, deionized water and isopropanol in sequence, and finally dried.

[0058] A dry powder of aluminum oxide nanoparticles, such as that supplied by PlasmaChem, is deposited in a sprinkle manner on the surface of a pre-washed glass slide. The nanoparticles used have a particle size of 5-150 nm. Most of them are crystalline and the crystals belong to three different crystal systems: rhombohedral (α-Al 2 o 3 ), tetragonal system (β-Al 2 o 3 ) and cubic (γ-Al 2 o 3 ).

[0059] After the deposition of the nanoparticles, the glass sheet was heated in an oven at 900°C for one hour, followed by controlled cooling at a rate of up to 35°C per hour.

[0060] The glass slides treated above were analyzed by the same technique as described in Example 1. Analysis showed that Al2O3 nanoparticles had bee...

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Abstract

Glass article with improved chemical resistance comprising a chemical reinforcing agent in the form of inclusions of nanoparticles, especially partially crystalline nanoparticles, in the bulk of the glass near one surface of the article.

Description

technical field [0001] The present invention relates to glass articles having increased and improved chemical resistance compared to known glass articles. Background technique [0002] It is well known that glass, if not protected, will corrode under the influence of adverse environmental conditions, especially in aqueous media with an alkaline pH. When the glass is soda-lime glass, when alkali metal cations such as Na + and to a lesser extent K + On approach to the glass surface, it detaches from the glass surface and dissolves in the surrounding medium, for example in the presence of moisture and running water. In order to limit this phenomenon, various methods have been proposed, such as depleting these ions close to the surface of the glass article. The method consists in treating the glass surface with a chemical agent capable of removing or significantly reducing the sodium and / or potassium content in thin areas close to the surface. [0003] However, the effect of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C14/00
CPCC03C14/006C03C2214/30
Inventor F·马里亚热P·布朗热D·考斯特F·勒考雷M·范登奈斯特
Owner AGC FLAT GLASS EUROPE SA
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