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Transparent low-colour lithium aluminium silicate glass ceramic and the use thereof

A glass-ceramic, transparent technology, applied in the field of LAS glass-ceramic, low-color lithium aluminosilicate glass-ceramic, can solve the problem of not providing devitrification resistance and transparency, and achieve low melting and forming temperature, devitrification resistance The effect of short sex and high light transmittance

Active Publication Date: 2014-11-26
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, this step does not provide any indication on the optimization of resistance to devitrification and clarity by selecting the components CaO, SrO and BaO

Method used

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  • Transparent low-colour lithium aluminium silicate glass ceramic and the use thereof
  • Transparent low-colour lithium aluminium silicate glass ceramic and the use thereof
  • Transparent low-colour lithium aluminium silicate glass ceramic and the use thereof

Examples

Experimental program
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Effect test

Embodiment Construction

[0136] The invention will be elucidated based on the following examples.

[0137] The transmission curve of the glass-ceramic of Example 21 is shown in a single figure.

[0138] Starting glasses from common raw materials in the glass industry were melted at a temperature of about 1620° C. for 4 hours. After melting the batch in a sintered quartz glass crucible, the melt was cast into a Pt / Rh crucible with an inner quartz glass crucible and homogenized at a temperature of 1550° C. for 30 minutes with stirring. After this homogenization, the glass was refined at 1640° C. for 2 hours. Subsequently, cast about 140×140×30mm 3 size and cool it down to room temperature in a cooling oven starting from 660 °C. Divide the casting into the dimensions required for research and for ceramization.

[0139] Table 1 lists the compositions and properties of the crystallizable initial glasses of the transparent glass ceramics of several implementation examples. Glasses 1 to 8 relate to glas...

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Abstract

A transparent low-colour lithium aluminium silicate (LAS) glass ceramic and the use thereof are described, said glass ceramic having an environmentally friendly composition with high-quartz mixed crystals as the main crystal phase and advantageous production features. The glass ceramic contains the following components (in wt% on the basis of oxide): TiO2 1.6 - < 2.5; Nd2O3 0.005 - 0.15; MgO 0.2 - 1.0; ZnO 1 - 2.5; CaO + SrO 0 - 1.5; BaO 0 - 1.5 with the condition B1: MgO + ZnO > CaO + SrO + BaO. The glass ceramic has a hue c* of less than 5.5, a light transmission Y greater than 81% and has no visually disruptive diffusion.

Description

technical field [0001] The invention relates to a transparent, in particular low-color, lithium aluminosilicate glass-ceramic according to the preamble of claim 1 . The invention also relates to the use of such LAS glass ceramics. Background technique [0002] It is known that Li 2 O-Al 2 o 3 -SiO 2 The glass of the system transforms into glass ceramics with high-quartz mixed crystals and / or keatite mixed crystals as the main crystal phase. [0003] A key property of these glass-ceramics, with high quartz mixed crystals as the predominant crystalline phase, is the ability to fabricate materials that provide an extremely low coefficient of thermal expansion over a predetermined temperature range. Usually, the thermal expansion characteristics are established so that the material provides very low expansion, mainly 0±0.3·10 around its application temperature -6 / K. Thermal expansion around room temperature is thus minimized, for example, in the case of use as substrate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/00C03C3/095
CPCC03C10/0009C03C3/095C03C10/0027
Inventor 弗里德里希·西贝斯艾维林·魏斯克劳斯·舍恩贝格尔乌尔里希·席夫纳法尔克·加贝尔
Owner SCHOTT AG
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