Abstract: Transparent, dyed cook top or hob with improved color display capability, consisting of a glass ceramic with high quartz mixed crystals as predominant crystal phase, whereby the glass-ceramic contains none of the chemical refining agents arsenic oxide and/or antimony, with transmission values of greater than 0.1% in the range of the visible light within the entire wavelength range greater than 450 nm, a light transmission in the visible of 0.8-2.5% and a transmission in the infrared at 1600 nm of 45-85%.

Abstract: Transparent, dyed cook top or hob with improved color display capability, consisting of a glass ceramic with high quartz mixed crystals as predominant crystal phase, whereby the glass-ceramic contains none of the chemical refining agents arsenic oxide and/or antimony, with transmission values of greater than 0.1% in the range of the visible light within the entire wavelength range greater than 450 nm, a light transmission in the visible of 0.8-2.5% and a transmission in the infrared at 1600 nm of 45-85%.

Abstract: Transparent, dyed cook top or hob with improved color display capability, consisting of a glass ceramic with high quartz mixed crystals as predominant crystal phase, whereby the glass-ceramic contains none of the chemical refining agents arsenic oxide and/or antimony, with transmission values of greater than 0.1% in the range of the visible light within the entire wavelength range greater than 450 nm, a light transmission in the visible of 0.8-2.5% and a transmission in the infrared at 1600 nm of 45-85%.

Abstract: A method of manufacturing glass ceramic articles such as glass ceramic plates for cooktops or fireplace windows is provided. The method facilitates the adjustment of a specific hue or a specific absorptivity of the glass ceramic in the visible spectral range. The method is based on the finding that the absorption of light by coloring agents which are appropriate for or present in glass ceramics can be attenuated during the ceramization process by adding substances that have a decoloring effect.

Abstract: A method for producing bubble-free glasses is provided, in which a glass mixture that is arsenic-free, antimony-free and tin-free with the exception of any unavoidable raw material impurities and at least one sulfate compound as a refining agent are used. The glass mixture and refining agent are melted and primarily refined in a first region of a melting tank, an average melting temperature (T1) is set at T1>1580° C. and an average melt residence time (t1) is set at t1>2 hours. A secondary refinement is carried out in a second region, an average melting temperature (T2) is set at T2>1660° C. and an average melt residence time (t2) is set at t2>1 hour, and the proportion of the SO3 resulting from decomposition of the sulfate is reduced to less than 0.002 wt. %.

Abstract: A transparent low-colour lithium aluminium silicate (LAS) glass ceramic and the use thereof are provided. The ceramic has an environmentally friendly composition with high-quartz mixed crystals as the main crystal phase. 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. In some embodiments, 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.

Abstract: The process for producing a transparent lithium aluminosilicate glass ceramic plate includes ceramicizing a green glass body of the Li2O—Al2O—SiO2 system using a ceramization program, which includes heating it, for the purpose of nucleation, to a temperature of 750° C.±20° C. and maintaining the temperature for 20±15 minutes, further heating the green glass body, for the purpose of ceramization, to a temperature of 900±20° C. and maintaining the to temperature for 20±15 minutes and then cooling to room temperature. The transparent plate has a thermal expansion coefficient (CTE) from ?0.15×10?6/K to +0.15×10?6/K at 30 to 700° C. and a brightness value observed at an angle of 2° of ?80 for a 4-mm thick plate for transmitted normal light.

Abstract: Transparent, dyed cook top or hob with improved color display capability, consisting of a glass ceramic with high quartz mixed crystals as predominant crystal phase, whereby the glass-ceramic contains none of the chemical refining agents arsenic oxide and/or antimony, with transmission values of greater than 0.1% in the range of the visible light within the entire wavelength range greater than 450 nm, a light transmission in the visible of 0.8-2.5% and a transmission in the infrared at 1600 nm of 45-85%.

Abstract: Transparent, dyed cook top or hob with improved color display capability, consisting of a glass ceramic with high quartz mixed crystals as predominant crystal phase, whereby the glass-ceramic contains none of the chemical refining agents arsenic oxide and/or antimony, with transmission values of greater than 0.1% in the range of the visible light within the entire wavelength range greater than 450 nm, a light transmission in the visible of 0.8-2.5% and a transmission in the infrared at 1600 nm of 45-85%.

Abstract: The armored or bulletproof glass include a transparent plate laminate, which includes one or more transparent glass ceramic plates made from a green glass body of the Li2O—Al2O3—SiO2 system, optionally one or more additional plates made of plastic material, and optionally one or more glass plates. The glass ceramic plate preferably has a thermal expansion coefficient of ?0.05×10?6/K to ?0.10×10?6/K at 30 to 700° C. and a brightness value for transmitted normal light at an angle of 2°?80 for a 4-mm thick plate. The transparent plate laminate preferably has a total of 4 to 8 plates and a thickness between 40 and 80 mm. A bulletproof vest, a fire prevention glazing, a fireplace viewing window pane, a cooktop, a magnetic storage plate or a substrate for semiconductor materials also advantageously include the transparent plate laminate described here.

Abstract: The process for producing a transparent lithium aluminosilicate glass ceramic plate includes ceramicizing a green glass body of the Li2O—Al2O—SiO2 system using a ceramization program, which includes heating it, for the purpose of nucleation, to a temperature of 750° C.±20° C. and maintaining the temperature for 20±15 minutes, further heating the green glass body, for the purpose of ceramization, to a temperature of 900±20° C. and maintaining the to temperature for 20±15 minutes and then cooling to room temperature. The transparent plate has a thermal expansion coefficient (CTE) from ?0.15×10?6/K to +0.15×10?6/K at 30 to 700° C. and a brightness value observed at an angle of 2° of ?80 for a 4-mm thick plate for transmitted normal light.

Abstract: A method of manufacturing glass ceramic articles such as glass ceramic plates for cooktops or fireplace windows is provided. The method facilitates the adjustment of a specific hue or a specific absorptivity of the glass ceramic in the visible spectral range. The method is based on the finding that the absorption of light by coloring agents which are appropriate for or present in glass ceramics can be attenuated during the ceramization process by adding substances that have a decoloring effect.

Abstract: A method for producing bubble-free glasses is provided, in which a glass mixture that is arsenic-free and antimony-free with the exception of any unavoidable raw material impurities and a sulfate compound and SnO2 as refining agents are used. The glass mixture is melted and primarily refined in a first region of a melting tank, an average melting temperature (T1) is set at T1>1560° C. and an average melt residence time (t1) is set at t1>2 hours. The proportion of SO3 resulting from the decomposition of the sulfate compound is reduced to less than 0.002 wt. % as the primary refinement is carried out. A secondary refinement is carried out in a second region of the melting tank, an average melting temperature (T2) is set at T2>1640° C. and an average melt residence time (t2) is set at t2>1 hour.

Abstract: A transparent low-colour lithium aluminium silicate (LAS) glass ceramic and the use thereof are provided. The ceramic has an environmentally friendly composition with high-quartz mixed crystals as the main crystal phase. 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. In some embodiments, 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.

Abstract: A method for producing bubble-free glasses is provided, in which a glass mixture that is arsenic-free, antimony-free and tin-free with the exception of any unavoidable raw material impurities and at least one sulfate compound as a refining agent are used. The glass mixture and refining agent are melted and primarily refined in a first region of a melting tank, an average melting temperature (T1) is set at T1>1580° C. and an average melt residence time (t1) is set at t1>2 hours. A secondary refinement is carried out in a second region, an average melting temperature (T2) is set at T2>1660° C. and an average melt residence time (t2) is set at t2>1 hour, and the proportion of the SO3 resulting from decomposition of the sulfate is reduced to less than 0.002 wt. %.

Abstract: The armored or bulletproof glass include a transparent plate laminate, which includes one or more transparent glass ceramic plates made from a green glass body of the Li2O—Al2O3—SiO2 system, optionally one or more additional plates made of plastic material, and optionally one or more glass plates. The glass ceramic plate preferably has a thermal expansion coefficient of ?0.05×10?6/K to ?0.10×10?6/K at 30 to 700° C. and a brightness value for transmitted normal light at an angle of 2°?80 for a 4-mm thick plate. The transparent plate laminate preferably has a total of 4 to 8 plates and a thickness between 40 and 80 mm. A bulletproof vest, a fire prevention glazing, a fireplace viewing window pane, a cooktop, a magnetic storage plate or a substrate for semiconductor materials also advantageously include the transparent plate laminate described here.

Abstract: The process for producing a transparent lithium aluminosilicate glass ceramic plate includes ceramicizing a green glass body of the Li2O—Al2O—SiO2 system using a ceramization program, which includes heating it, for the purpose of nucleation, to a temperature of 750° C.±20° C. and maintaining the temperature for 20±15 minutes, further heating the green glass body, for the purpose of ceramization, to a temperature of 900±20° C. and maintaining the to temperature for 20±15 minutes and then cooling to room temperature. The transparent plate has a thermal expansion coefficient (CTE) from ?0.15×10?6/K to +0.15×10?6/K at 30 to 700° C. and a brightness value observed at an angle of 2° of ?80 for a 4-mm thick plate for transmitted normal light.

Abstract: A lithium-aluminosilicate glass or a corresponding glass ceramic that has a content of 0-0.4SnO2, 1.3-2.7% by weight of ?SnO2+TiO2, 1.3-2.5% by weight of ZrO2, 3.65-4.3% by weight of ?ZrO2+0.87 (TiO2+SnO2), ?0.04% by weight of Fe2O3, 50-4000 ppm of Nd2O3 and 0-50 ppm of CoO is described. The glass or the glass ceramic is color-neutral, has a turbidity of less than 1% HAZE and a high light transmission. The glazing time for conversion of the glass into glass ceramic is especially short with less than 2.5 hours.

Abstract: The transparent glass ceramic plate has a thermal expansion coefficient (CTE) of ?0.05 to ?0.1×10?6/K at 30 to 700° C. and a composition, in wt. %, consisting of: Li2O, 3.0-4.5; Al2O3, 18.0-24.0; SiO2, 55.0-70.0; TiO2, 0.01-2.3; ZrO2, 0.01-2.0; ? TiO2+ZrO2, 0.5-4.3; SnO2, 0-0.2; MgO, 0-0.8; BaO, 0-3; ZnO, 0-2.5; Na2O, 0-1.5; As2O3, 0.3-0.9; and Fe2O3, 0.004 to 0.02. A transparent plate laminate, which is used as armor or in a bullet-proof vest and which contains one or more of this glass ceramic plate together with optional glass and/or plastic plates, and a process for making the glass ceramic plate, are also described.

Abstract: A lithium-aluminosilicate glass or a corresponding glass ceramic that has a content of 0-0.4SnO2, 1.3-2.7% by weight of ?SnO2+TiO2, 1.3-2.5% by weight of ZrO2, 3.65-4.3% by weight of ?ZrO2+0.87 (TiO2+SnO2), ?0.04% by weight of Fe2O3, 50-4000 ppm of Nd2O3 and 0-50 ppm of CoO is described. The glass or the glass ceramic is color-neutral, has a turbidity of less than 1% HAZE and a high light transmission. The glazing time for conversion of the glass into glass ceramic is especially short with less than 2.5 hours.