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Glass frit free of alkaline, lead and cadmium and its use to produce colored enamels
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A technology for ceramic pigments and glass ceramics, applied in the field of glass frit, can solve the problems of insufficient bending fracture strength, and achieve the effects of low thermal expansion, improved performance and reduced stress
Active Publication Date: 2013-02-06
SCHOTT AG
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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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[0128] Embodiments 1-3 and 19 are comparative examples:
[0129] In examples 1-3 neither CuO nor Bi 2 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 T...
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 printer...
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Abstract
Alkali-, lead and calcium free glass frit for the preparation of ceramic coating material, comprises a glass composition of zinc oxide; boric oxide; silicon oxide; RO, where RO is copper oxide and / or magnesium oxide; bismuth oxide; aluminum oxide; cobalt oxide; iron oxide; manganese oxide; titanium dioxide; zirconium oxide; fluorine; and optionally additives, where the glass frit exhibits a thermal expansion coefficient (alpha) of less than 6.5x10 -> 6> K -> 1> at 20-300[deg]C and a glass transition temperature (T g) of less than 550[deg]C. Alkali-, lead and calcium free glass frit exhibiting a thermal expansion coefficient (alpha) of less than 6.5x10 -> 6> K -> 1> at 20-300[deg]C and a glass transition temperature (T g) of less than 550[deg]C, for the preparation of ceramic coating material, comprises a glass composition of zinc oxide (ZnO) (35-70 mol.%); boric oxide (B 2O 3) (20-38 mol.%); silicon oxide (SiO 2) (6-20 mol.%); RO (0.1-30 mol.%), where RO is copper oxide (CuO) and / or magnesium oxide (MnO); bismuth oxide (Bi 2O 3) (0-20 mol.%); aluminum oxide (Al 2O 3) (0-5 mol.%); cobalt oxide (CO) (0-5 mol.%); iron oxide (Fe 2O 3) (0-5 mol.%); manganese oxide (MnO) (0-10 mol.%); titanium dioxide (TiO 2) (0-5 mol.%); zirconium oxide (ZrO 2) (0-5 mol.%); fluorine (0 to less than 6 mol.%, preferably 0-5 mol.%); and optionally additives, where the amount of CuO, Fe 2O 3 and MnO does not exceed 15 mol.%, and CuO free glass frit exhibits a Bi 2O 3 content of 0.1-20 mol.%. Independent claims are included for: (1) the preparation of the glass frit comprising melting the glass composition at 1000-1300[deg]C, quenching the melt and grinding the obtained material; (2) use of the glass frit in the form of primary frit to produce ceramic color for the decoration of a base substrate; (3) the preparation of ceramic coating material comprising preparing the glass frit in the form of a powder that exhibits or composed of the glass composition, preparing a paste from the powder using a suspension-forming agent, applying the paste on a base substrate, and firing the paste onto the base substrate; and (4) alkaline, lead and cadmium-free ceramic coating material, obtained by the above procedure.
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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