Glass frit free of alkaline, lead and cadmium and its use to produce coloured enamels

A technology of ceramic pigments and glass frit, which is applied in the application field of preparing ceramic pigments, can solve problems such as insufficient bending fracture strength, achieve low thermal expansion, high bending fracture strength, and improve performance

Active Publication Date: 2007-12-26
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bending fracture strength of such decorated glass or glass-ceramic objects is therefore completely insufficient for most applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0128] Embodiments 1-3 and 19 are comparative examples:

[0129] In examples 1-3 neither CuO nor Bi2 o 3 , so that the transition temperature T g at the required t g 2 o 3 -SiO 2 - The system is not suitable. Because the calcination temperature is too high, undesired deformations of the carrier glass occur.

[0130] In Comparative Example 19, the fluorine content was 6.7 mol%, which was out of the required range, so that the prerequisite for the coefficient of thermal expansion was not satisfied. The addition of fluorine promotes the crystallization tendency, so that the fluorine content is limited to <6 mol%, preferably not more than 5 mol%.

[0131] Examples 3-5 show that with Bi 2 o 3 content increase T g The value decreases while the thermal expansion increases. In Examples 6-9, an increase in the CuO content reduces the crystallization tendency and reduces the T at almost the same thermal expansion coefficient g -value. In Examples 10 and 11, by Bi 2 o 3 The...

Embodiment 24-34

[0134] Prepared in BOROFLOAT  Calcined ceramic pigments obtained from Examples 10 and 23 on 33:

[0135] The quenched material of Examples 10 and 23 in distilled water was ground to a powder with an average particle size of 2-5 [mu]m. According to Table 3, different low-expansion fillers, such as spodumene (LiAlSi 2 o 6 , d 50 =4μm, OTAVI MINERALS), lithium petalite (LiAlSi 4 o 10 , d 50 =4μm, ANKERPOORT N V), niobium oxide (Nb 2 o 5 , d 50 =4μm, COMETALS) and tin dioxide (SnO 2 , d 50 =0.7μm, LOMBERG) and pigments such as titanium dioxide (TiO 2 , d 50 = 0.7 μm, KRONOS  1001) and Cu-Cr-spinel (CuCr 2 o 4 , d 50 = 1.7 μm, FERRO247960), in % by weight. The powder mixture was then made into a paste in a blender at a powder:screen printing medium ratio of 2:1. Media 80599 from FERRO was used as screen printing media. The paste is homogenized on a three-roll mill. The screen printable paste was applied to 3.3 mm glass slides with a semi-automatic screen print...

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Abstract

The present invention relates to a frit which does not contain base metal, lead or cadmium, the frit is provided with a thermal expansion coefficient alpha of less than 6.5*10-6k-1 at the temperature range from 20 to 300 degree and a transition temperature Tg of less than 550 degree, the frit includes special glass composition or is composed of it. The frit is especially suitable for preparing the low-calcined ceramic pigment which can be used to decorate the low-expending carrier substrate, such as glass and/or devitroceram.

Description

technical field [0001] The invention relates to a glass frit free of alkali metal, lead and cadmium and its application for preparing ceramic pigments. Background technique [0002] It is well known to decorate glass or glass-ceramic objects using ceramic pigments, which contain one or more glass frits and possibly one or more color-providing compositions (pigments). In addition, fillers may be present, which serve to improve the physical and chemical properties of the ceramic pigments. [0003] "Glass frit" is generally understood to be an intermediate product in the production of glass melts. Glass frit is a crumb-like porous glass produced by quenching a raw material mixture melted at high temperature. Glass frit is used as the raw material for glaze preparation. Glazes are prepared by fusing glass frit and added compositions, such as color pigments or fillers, on a workpiece made of metal or glass. Therefore, ceramic pigments are often called glazes or glass glazes. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85C03C17/02C03C8/00C03C3/066
CPCC03C8/04C03C8/14C03C17/04C03C8/06C03C8/22
Inventor 亚历山大・施托希托马斯・克洛斯
Owner SCHOTT AG
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