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Silico-sodo-calcic glass-ceramic material

A crystalline material and glass technology, which is applied in the field of soda-lime glass crystalline materials, can solve problems such as corrosion of environmental refractory materials, and achieve the effects of improving tempering, increasing mechanical strength, and good resistance to scratch propagation

Inactive Publication Date: 2012-07-18
AGC GLASS EUROPE SA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is a big disadvantage for glass products that require increased mechanical strength, such as tile veneering or work surfaces, and often require cutting
However, the introduction of traditional opacifiers such as fluoride into glass compositions has two major drawbacks: (i) an undeniable negative impact on the environment and (ii) a prominent corrosion phenomenon for the refractories of melting furnaces

Method used

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  • Silico-sodo-calcic glass-ceramic material
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  • Silico-sodo-calcic glass-ceramic material

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Embodiment

[0064] Composition C1 comprises 80.3% SiO expressed as a percentage of the total weight 2 , 10.3% Na 2 O and 9.4% CaO.

[0065] This composition was melted at a temperature of 1550°C and then poured into a 4cm x 4cm mold with a height of one centimeter. The amorphous glass obtained by gradually cooling composition C1 was then heat-treated by heating (annealing) at 1000° C. for 1 hour, and then gradually cooled to ambient temperature again. For composition C1 material M1 was obtained.

[0066] The coefficient of linear thermal expansion (CET), hardness and brittleness were evaluated for material M1. Hardness (H) and brittleness (B) are determined by Vickers indentation (load: 0.5kg, application time: 25 seconds), while CET is obtained using a dilatometer for a temperature range from 25°C to 300°C (ISO 7991: 1987 standard). These techniques will not be further explained, since they are well known to those skilled in the art of glass materials and glass crystalline materials...

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Abstract

The invention relates to a glass-ceramic material having, as main components, SiO2, Na2O and CaO, and including crystalline SiO2 particles homogenously dispersed in the space of an amorphous matrix. Such a material has good mechanical strength, in particular good resistance to the propagation of scratches, and enables improved tempering. Said material furthermore has a pleasant aesthetic appearance.

Description

technical field [0001] The field of the invention relates to glass materials in the soda calcium system (système silico-sodo-calcique). More specifically, the present invention relates to soda-lime glass crystalline materials which have good mechanical strength, especially good resistance to scratch propagation, and which allow improved toughening. The material according to the invention has these properties combined with a pleasing aesthetic appearance. Background technique [0002] Glass in its broadest definition refers to a material which is amorphous, lacks crystalline order and is isotropic. During the production of amorphous materials of this type comprising components of crystallizable compounds, a crystallization phenomenon known as devitrification may occur. In the specific case of soda-lime glass, the composition of the glass has been optimized over decades to limit this redundant phenomenon. This is because, when crystallization occurs in an accidental or unco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/078C03C4/00C03C10/00
CPCC03C10/0009C03C3/078C03C4/005
Inventor M・博加尔茨S・戈代
Owner AGC GLASS EUROPE SA
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