Abstract:
A lithium-containing, transparent glass-ceramic material is provided. The material has low thermal expansion and has an amorphous, lithium-depleted, vitreous surface zone. The zone is at least 50 nm thick on all sides and encloses a crystalline interior, which has high transmission. The material includes a transition region connecting the zone and the interior.
Abstract:
The method produces a glass-ceramic article substantially in the form of a plate with improved high temperature difference resistance or strength. The glass-ceramic article contains keatite mixed crystals (KMK) or high quartz mixed crystals (HQMK) as well as the keatite mixed crystals (KMK). The method includes heating a glass-ceramic in a high quartz mixed crystal state to form the keatite mixed crystals with a heating rate of 20 K/min to 150 K/min, preferably more than 15 K/min, especially preferably more than 20 K/min. These high heating rates increase the temperature difference resistance.
Abstract:
The invention relates to lead- and cadmium-free glass for glazing, enamelling and decorating glasses or glass-ceramics which have a low coefficient of thermal expansion of less than 2×10−6/K, having the composition (in % by weight) 0-6 Li2O, 0-5 Na2O, 0 to less than 2 K2O, where the sum Li2O+K2+Na2O is between 2 and 12, 0-4 MgO, 0-4 CaO, 0-4 SrO, 0-1 BaO, 0-4 ZnO, 3 to less than 10 Al2O3, 13-23 B2O3, 50-65 SiO2, 0-4 TiO2, 0-4 ZrO2 and 0-4 F, as replacement for oxygen and containing up to 30% by weight of a pigment which is resistant at the firing temperature, where the glass is suitable for glazing, enamelling and decoration in both primary and secondary firing, and both the full-area and sparse glaze, enamel or decoration layers have low abrasion susceptibility after firing, and it relates to processes for the production of a glass-ceramic coated therewith.
Abstract translation:本发明涉及具有小于2×10-6 / K的低热膨胀系数的玻璃,搪瓷和装饰玻璃或玻璃陶瓷的无铅和无镉玻璃,其组成(重量%)为0- 6 Li 2 O,0-5 Na 2 O,0至小于2 K 2 O,其中总和Li 2 O + K 2 + Na 2 O为2至12,0-4MgO,0-4 CaO,0-4 SrO,0-1 BaO,0 -4 ZnO,3至小于10的Al2O3,13-23B2O3,50-65SiO 2,0-4TiO 2,0-4 ZrO 2和0-4 F,作为氧的替代,并含有至多30重量%的 在烧成温度下耐光的颜料,其中玻璃适用于初级和次级烧制中的玻璃,搪瓷和装饰,并且全面和稀疏的釉料,搪瓷或装饰层在烧制后具有低的耐磨性,并且它 涉及制备涂覆有玻璃陶瓷的方法。
Abstract:
In order to avoid haloing when burning in a decoration on a glass ceramic substrate, the invention provides a method for producing a decorated glass ceramic substrate, in which a glass substrate is produced or provided, a layer containing silicon oxide is deposited on the substrate, decorative ink is applied on the layer containing silicon oxide and the decorative ink is burned in, wherein the layer containing silicon oxide is flame-pyrolytically deposited by sweeping over at least one region of the surface of a substrate with a flame and hydrolyzing a silicon compound added to the flame.
Abstract:
The method produces a glass-ceramic article substantially in the form of a plate with improved high temperature difference resistance or strength. The glass-ceramic article contains keatite mixed crystals (KMK) or high quartz mixed crystals (HQMK) as well as the keatite mixed crystals (KMK). The method includes heating a glass-ceramic in a high quartz mixed crystal state to form the keatite mixed crystals with a heating rate of 20 K/min to 150 K/min, preferably more than 15 K/min, especially preferably more than 20 K/min. These high heating rates increase the temperature difference resistance.
Abstract:
A lithium-containing, transparent glass-ceramic material is provided. The material has low thermal expansion and has an amorphous, lithium-depleted, vitreous surface zone. The zone is at least 50 nm thick on all sides and encloses a crystalline interior, which has high transmission. The material includes a transition region connecting the zone and the interior.
Abstract:
The support plate for transporting products during thermal treatment at firing temperatures is a nonporous keatite glass ceramic supporting member without a glassy surface layer. It has a nubby structure on an underside thereof and preferably C-shaped rounded edges. A method of making the keatite glass ceramic supporting member is described.