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Glass and use of a glass for glass-metal compounds

一种玻璃、用途的技术，应用在该玻璃自身领域

Inactive Publication Date: 2010-03-24
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this approach has several disadvantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0059] Three exemplary glasses prepared according to the present invention and two glasses as comparative examples were used from conventional raw materials.

[0060] For these exemplary glasses A1-A3 and comparative glasses V1-V2, Tables 1 and 3 show the composition in weight % of the various components (Table 1) and the composition in mole % and various sums, The proportion and the proportion of the sum (Table 3). Table 2 shows the following important properties of the examples and comparative examples:

[0061] - Coefficient of thermal expansion α 20 / 300 [10 -6 / K]

[0062] -Transition temperature T g [℃]

[0063] - Processing temperature V A [℃]

[0064] - the temperature at which the glass melts, referred to herein as the "melting point" [°C]

[0065] - relative hydrolytic stability, determined according to ISO 719 and then normalized by means of V2

[0066] - relative tensile strength, calculated and then normalized by means of V2

[0067] - Relative production...

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PUM

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Abstract

Glass having a glass composition (C1) comprises (wt.%): silicon dioxide (SiO 2) (73-77), boron oxide (B 2O 3) (6-less than 8), aluminum oxide (Al 2O 3) (6-6.5), sodium oxide (Na 2O) (5.5-7), potassiumoxide (K 2O) (1-3), calcium oxide (CaO) (0.5-3.2), magnesium oxide (MgO) (0-2), iron oxide (Fe 2O 3) (50-150 parts per million) (ppm), and titanium oxides (TiO 2) (0-less than 100 ppm), where a ratioof sum of respective amounts of alkaline-earth metal oxides, in mol.%, in the glass composition to a sum of respective amounts of alkali metal oxides, in mol.%, is = 0.6. An independent claim is included for a glass-metal bond for a tube collector comprising a glass tube and a metal component bonded to the glass tube, where the glass tube has a glass composition (C1), where a ratio of sum of respective amounts of alkaline-earth metal oxides, in mol.%, in the glass composition to a sum of respective amounts of alkali metal oxides, in mol.%, is smaller than equal to 0.6.

Description

technical field [0001] The present invention relates to the use of glass for glass-metal bonds. The invention also relates to the glass itself. Background technique [0002] Glass-metal junctions are used, for example, in vacuum tube collectors. In vacuum collector tubes, a vacuum-tight glass-metal joint for heat insulation is required between an absorber tube made of metal and a jacket tube made of glass. [0003] Such collector tubes are used, for example, in parabolic trough solar power plants. [0004] In parabolic trough solar power plants, operating temperatures of up to 400°C are generated in the collector tubes, and there are huge local temperature differences. Temperature variations due to the diurnal cycle and intermittent cloud periods add constant stress to the collector tubes. [0005] In high-temperature solar collector tubes, on the one hand, so-called mismatched glass-metal junctions have been used. Their name is based on the fact that glass and metal ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/091C03C8/24F24J2/48
CPCC03C4/10C03C27/02Y02E10/44C03C3/118C03C4/0085F24J2/055F24S10/45
Inventor 额尔哈德·迪克约翰娜·克里格诺沃尔夫冈·扎特尔斯蒂芬·特拉茨基
Owner SCHOTT AG
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