Abstract: A lithium aluminum silicate glass ceramic, which, apart from unavoidable impurities, is As2O3-free and Sb2O3-free. The lithium aluminum silicate glass ceramic has keatite as primary crystal phase and a keatite peak temperature TP of the keatite solid solution formation in the range of 980° C. to 1090° C., and the keatite peak temperature TP is determined by dynamic differential calorimetry (DSC) in accordance with DIN 51007:2019-04 at a heating rate of 5 K/min. A ceramization method is also described.

Abstract: An arrangement having an impeller that rotates about an axis and a stationary diffuser located downstream with guide vanes. The impeller has an inlet for an axial supply flow and an outlet for a radial out-flow, wherein radially and axially extending rotor blades are arranged between a wheel disc and a cover disc of the impeller. The impeller channels are separated from one another in a circumferential direction. The diffuser extends substantially radially along a main flow direction and has an axial channel width. The diffuser has a diffuser inlet and outlet, wherein guide vanes extending axially along a blade vertical direction and radially along a through-flow direction are arranged between the wheel disc side and the cover disc side of the diffuser, which separate the guide vane channels from one another. An inlet edge angle is smaller on the cover disc side than on the wheel disc side.

Abstract: An arrangement having an impeller that rotates about an axis and a stationary diffuser located downstream with guide vanes. The impeller has an inlet for an axial supply flow and an outlet for a radial out-flow, wherein radially and axially extending rotor blades are arranged between a wheel disc and a cover disc of the impeller. The impeller channels are separated from one another in a circumferential direction. The diffuser extends substantially radially along a main flow direction and has an axial channel width. The diffuser has a diffuser inlet and outlet, wherein guide vanes extending axially along a blade vertical direction and radially along a through-flow direction are arranged between the wheel disc side and the cover disc side of the diffuser, which separate the guide vane channels from one another. An inlet edge angle is smaller on the cover disc side than on the wheel disc side.

Abstract: An arrangement having an impeller that rotates about an axis and a stationary diffuser located downstream with guide vanes. The impeller has an inlet for an axial supply flow and an outlet for a radial out-flow, wherein radially and axially extending rotor blades are arranged between a wheel disc and a cover disc of the impeller. The impeller channels are separated from one another in a circumferential direction. The diffuser extends substantially radially along a main flow direction and has an axial channel width. The diffuser has a diffuser inlet and outlet, wherein guide vanes extending axially along a blade vertical direction and radially along a through-flow direction are arranged between the wheel disc side and the cover disc side of the diffuser, which separate the guide vane channels from one another. An inlet edge angle is smaller on the cover disc side than on the wheel disc side.

Abstract: An arrangement having an impeller that rotates about an axis and a stationary diffuser located downstream with guide vanes. The impeller has an inlet for an axial supply flow and an outlet for a radial out-flow, wherein radially and axially extending rotor blades are arranged between a wheel disc and a cover disc of the impeller. The impeller channels are separated from one another in a circumferential direction. The diffuser extends substantially radially along a main flow direction and has an axial channel width. The diffuser has a diffuser inlet and outlet, wherein guide vanes extending axially along a blade vertical direction and radially along a through-flow direction are arranged between the wheel disc side and the cover disc side of the diffuser, which separate the guide vane channels from one another. An inlet edge angle is smaller on the cover disc side than on the wheel disc side.

Abstract: A description is given of a coloured, transparent, lithium aluminium silicate glass-ceramic and also of the use thereof, said glass-ceramic possessing a light transmission Y of 2.5% to 10% and a spectral transmission ?(at 465 nm) of more than 1.0%.

Abstract: A glass ceramic substrate made of a transparent, colored LAS glass ceramic is provided. The glass ceramic has a gradient layer with keatite solid solution and an underlying core with high-quartz solid solution as predominant crystal phase. The keatite solid solution in a depth of 10 ?m or greater exceeds 50% of the sum of the high-quartz solid solution proportion and keatite solid solution proportion. The ceramization includes a crystal transformation step, in which the high-quartz solid solution is transformed at a maximum temperature in the range of 910° to 980° and a time period of between 1 and 25 minutes in part into the keatite solid solution.

Abstract: A glass ceramic substrate made of a transparent, colored LAS glass ceramic is provided. The glass ceramic has a gradient layer with keatite solid solution and an underlying core with high-quartz solid solution as predominant crystal phase. The keatite solid solution in a depth of 10 ?m or greater exceeds 50% of the sum of the high-quartz solid solution proportion and keatite solid solution proportion. The ceramization includes a crystal transformation step, in which the high-quartz solid solution is transformed at a maximum temperature in the range of 910° to 980° and a time period of between 1 and 25 minutes in part into the keatite solid solution.

Abstract: The invention relates to a method and to a device for ceramizing green glass in a continuous furnace, with the ceramization being carried out directly on rollers.

Abstract: The invention relates to a method and to a device for ceramizing green glass in a continuous furnace, with the ceramization being carried out directly on rollers.

Abstract: A membrane stack unit for performing a multichamber treatment of plural component fluids, composed of a plurality of sealing frames, membranes interposed between the frames, and two end plates with milegrated electrodes disposed at respective opposite ends of the unit with the frames and membranes interposed therebetween. Each frame has four side edges enclosing a region constituting a treatment chamber, with one pair of opposed side edges being provided with a set of through bores for conducting fluid, a set of second bores, and inlet and discharge channels each communicating with a respective second bore and with the chamber, and the second pair of opposed side edges being provided with through bores for conducting fluid. Each membrane is provided with openings aligned with all of the bores. The sealing frames are oriented relative to one another such that at least some of the through bores in one frame are aligned with respective ones of the second bores of another frame.

Abstract: A membrane stack unit for performing a multichamber treatment of plural component fluids, composed of a plurality of sealing frames, membranes interposed between the frames, and two end plates with integrated electrodes disposed at respective opposite ends of the unit with the frames and membranes interposed therebetween. Each frame has four side edges enclosing a region constituting a treatment chamber, with one pair of opposed side edges being provided with a set of through bores for conducting fluid, a set of second bores, and inlet and discharge channels each communicating with a respective second bore and with the chamber, and the second pair of opposed side edges being provided with through bores for conducting fluid. Each membrane is provided with openings aligned with all of the bores. The sealing frames are oriented relative to one another such that at least some of the through bores in one frame are aligned with respective ones of the second bores of another frame.

Abstract: A sealing frame for alternately arranged anion and cation exchanger membranes of a membrane stack for electrodialysis. The frame edges surround a chamber provided with a net-like spacer placed or inserted therein, and have oppositely located continuous supply and connection bores passing therethrough for the solution to be treated and for the solution enriched with or depleted of separated dissolved electrolyte or electrically non-charged dissolved materials. These bores alternately communicate by means of supply or discharge troughs or channels with the interior of the chamber. The supply and discharge troughs or channels diverge to such an extent in a direction toward the chamber interior that the flow media are distributed in essence over the complete width of the flow path between the cooperating supply and discharge troughs or channels. Furthermore, the net-like spacers extend as far as into the diverging regions of the supply and discharge troughs or channels.