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: 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: 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: A transparent, dyed cooktop is provided that has improved color display capability. The cooktop is made of a glass ceramic having high quartz mixed crystals as the predominant crystal phase, wherein the glass ceramic comprises none of the chemical refining agents arsenic oxide and/or antimony oxide, except for inevitable trace amounts. The glass ceramic has transmission values of greater than 0.1% in the range of visible light over the entire wavelength range greater than 450 nm, light transmission in the visible range of 0.8 to 5%, and transmission in the infrared at 1600 nm of 45-85%. The glass ceramic also includes a display apparatus that has a display device which is designed to display different operating conditions with different colors and/or symbols.

Abstract: An oven muffle that has at least two wall elements adjoining each other, which delimit at least some regions of an interior space that is used as a cooking chamber. The wall elements are of a glass or a glass ceramic and the adjacent wall elements are oriented at an angle with respect to one another. In an oven muffle of this invention, along with ease of cleaning, a simple structural design is achieved if the wall elements are integrally joined to one another and constitute one formed part.

Abstract: In order to obtain glass or glass ceramic materials having increased strength, a method is provided for producing glass or glass ceramic articles, which comprises: producing an initial glass body, mounting the initial glass body on a gas cushion between a levitation support and the initial glass body, and at least partially ceramizing the initial glass body on the levitation support. The levitation support comprises at least one continuous surface region having at least one gas feed region where levitation gas for the gas cushion is fed out from the levitation support, and at least one gas discharge region where gas from the gas cushion is at least partially discharged into the levitation support.

Abstract: A method for the production of protection devices is provided. The method includes the step of providing a tile package. The provision of the tile package includes the steps of: laminating at least one board of a tile material onto a polymer foil; scoring the board on the side which is opposite to the polymer foil; and fracturing the board along the scoring lines for achieving a plurality of tiles which are fixed on the polymer foil.

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: In order to obtain glass or glass ceramic materials having increased strength, the invention provides a method for producing glass or glass ceramic articles, which comprises the steps: producing an initial glass body (11), mounting the initial glass body (11) on a gas cushion (13) between a levitation support (1) and the initial glass body (11), and at least partially ceramizing the initial glass body (11) on the levitation support (1). The levitation support comprises at least one continuous surface region (3) having at least one gas feed region (151, 152, 153) where levitation gas for the gas cushion (13) is fed out from the levitation support, and at least one gas discharge region (171 172, 173) where gas from the gas cushion (13) is at least partially discharged into the levitation support.

Abstract: An oven muffle having a receiving space, at least some regions of which are delimited by wall elements, in which at least one of the wall elements is permeable to IR radiation or has a region that is permeable to IR radiation. In the oven muffle, the cooking performance is successfully improved while also providing an easily cleanable interior because a reflecting element that reflects IR radiation is positioned in the region of the outer surface of the wall element on a side oriented away from the receiving space.

Abstract: A method for the production of protection devices is provided. The method includes the step of providing a tile package. The provision of the tile package includes the steps of: laminating at least one board of a tile material onto a polymer foil; scoring the board on the side which is opposite to the polymer foil; and fracturing the board along the scoring lines for achieving a plurality of tiles which are fixed on the polymer foil.

Abstract: A transparent, dyed cooktop is provided that has improved color display capability. The cooktop is made of a glass ceramic having high quartz mixed crystals as the predominant crystal phase, wherein the glass ceramic comprises none of the chemical refining agents arsenic oxide and/or antimony oxide, except for inevitable trace amounts. The glass ceramic has transmission values of greater than 0.1% in the range of visible light over the entire wavelength range greater than 450 nm, light transmission in the visible range of 0.8 to 5%, and transmission in the infrared at 1600 nm of 45-85%. The glass ceramic also includes a display apparatus that has a display device which is designed to display different operating conditions with different colours and/or symbols.

Abstract: An oven muffle having a receiving space, at least some regions of which are delimited by wall elements, in which at least one of the wall elements is permeable to IR radiation or has a region that is permeable to IR radiation. In the oven muffle, the cooking performance is successfully improved while also providing an easily cleanable interior because a reflecting element that reflects IR radiation is positioned in the region of the outer surface of the wall element on a side oriented away from the receiving space.

Abstract: In order to obtain glass or glass ceramic materials having increased strength, the invention provides a method for producing glass or glass ceramic articles, which comprises the steps: producing an initial glass body (11), mounting the initial glass body (11) on a gas cushion (13) between a levitation support (1) and the initial glass body (11), and at least partially ceramizing the initial glass body (11) on the levitation support (1). The levitation support comprises at least one continuous surface region (3) having at least one gas feed region (151, 152, 153) where levitation gas for the gas cushion (13) is fed out from the levitation support, and at least one gas discharge region (171 172, 173) where gas from the gas cushion (13) is at least partially discharged into the levitation support.

Abstract: The invention relates to a work plate arrangement (1) comprising a work plate (2) and a hot plate (3), said hot plate (3) being inserted in a recess (4) of the work plate (2). In order to provide a work plate arrangement (1) which also enables a wok to be used for cooking purposes in a simple manner, the hot plate (3) is provided with a bowl (5) which is made of a glass ceramic material and which protrudes into the recess (4) of the work plate (2), said bowl being used to receive a wok and having a heating device arranged thereunder (5).

Abstract: The cooking station includes a working panel (2) or other cooking station component providing a working or cooking surface (2s); a wok-type glass-ceramic bowl (1) built into an opening (O) provided in the working panel (2) or other cooking station component, which has an upstanding edge (1e) and a sunken curved heating surface (1s), the upstanding edge (1e) being arranged sunken to a predetermined depth below the working or cooking surface or flush with the working or cooking surface (2s); attaching components for rigidly mounting the glass-ceramic bowl (1) in the opening in the working or cooking surface and a bottom pan (3) attached under the glass-ceramic bowl (1) and to the attaching components, which provides support for heating elements of the cooking station.

Abstract: The cooking station includes a working panel (2) or other cooking station component providing a working or cooking surface (2s); a wok-type glass-ceramic bowl (1) built into an opening (O) provided in the working panel (2) or other cooking station component, which has an upstanding edge (1e) and a sunken curved heating surface (1s), the upstanding edge (1e) being arranged sunken to a predetermined depth below the working or cooking surface or flush with the working or cooking surface (2s); attaching components for rigidly mounting the glass-ceramic bowl (1) in the opening in the working or cooking surface and a bottom pan (3) attached under the glass-ceramic bowl (1) and to the attaching components, which provides support for heating elements of the cooking station.

Abstract: The wok is made from hardened glass or glass-ceramic material so that it has a cooking surface that is easier to clean than prior art metal woks. Furthermore when it is heated a better temperature distribution for cooking is produced and it can be universally heated, either by a radiantly heated body or an atmospheric gas burner. The method of making the wok starts with a glass blank or piece of borosilicate glass, which is heated until it softens and then is shaped or formed into the shape of the wok, optionally ceramicized and cooled.