Abstract: A device for electrically heating a vertically erect chamber comprising several heating zones arranged vertically one above the other. The components of the device, with the exception of the insulating components, are made from graphite materials. Each zone (Z) comprises a number of supports (1), arranged in an essentially even distribution around the chamber for heating, which simultaneously serve as electrical supplies for the heater, and the heater for each zone (Z) is fixed at one end and longitudinally displaceable at the other end.

Abstract: The invention relates to a device for electrically heating a vertically erect chamber, for example, a reactor, to high temperatures (?1000° C.) and/or with high power (30 to 1000 kW per zone), comprising several heating zones arranged vertically one above the other. The components of the de- vice, with the exception of the insulating components, are made from graphite materials. The aim of the invention is to embody and develop the device such that the largest possible degree of stability and functional capability for the whole device is achieved with low constructional complexity. The device should in particular be capable of heating very tall chambers.

Abstract: The invention relates to a method for producing hyper-pure, granular silicon by decomposing a gas containing silicon in a reactor consisting of a silicon carbide-based, carbon-fiber reinforced material; to a corresponding reactor; and to the use of said reactor for producing silicon.

Abstract: The invention relates to a method for producing hyper-pure, granular silicon by decomposing a gas containing silicon in a reactor consisting of a silicon carbide-based, carbon-fiber reinforced material; to a corresponding reactor; and to the use of said reactor for producing silicon.

Abstract: Metal and ceramic sintered bodies and coatings are produced using a combination of:(a) nanocrystalline metal or ceramic powder wherein less than 1% of the individual particles have a deviation of more than 40%, and no individual particles have a deviation of more than 60%, from the average grain size, and(b) at least one low molecular-weight organic compound having at least one functional group that can react and/or interact with groups present on the surface of the powder particles, the materials (a) and (b) being dispersed in water and/or a polar organic solvent as dispersion medium.

Abstract: The present invention relates to a process for the preparation of finely divided metal and/or ceramic powders by reacting appropriate metal compounds and appropriate reagents in the gas phase (CVR) chemical vapor reaction, wherein the metal compound(s) and the further reagents are brought to reaction in the gaseous state in a reactor and are subsequently homogeneously condensed directly out of the gas phase, with exclusion of any wall reaction, and are subsequently separated from the reaction medium.

Abstract: This invention relates to fine-particle powders of the metals B, Al, Si, Ti, Zr, Hf, V, Nb, Ta and/or Cr which have a defined particle size of 1.0 nm to less than 3 .mu.m. Less than 1% of the individual particles of the powder deviate by more than 40% from the average particle size, and no individual particle of the powder deviates by more than 60% from the average particle size.

Abstract: This invention relates to fine-particle powders of the metals Fe, Co, Ni, W and/or Mo which have a defined particle size of 1.0 nm to less than 1 00 nm. Less than 1% of the individual particles of the powder deviate by more than 40% from the average particle size, and no individual particle of the powder deviates by more than 60% from the average particle size.

Abstract: The invention relates to fine non-oxide ceramic powders MeX, whereinMe=B, Al, Si, Ti, Zr, Hf, V, Y, Ta, Nb, Mo, W, La, Fe, Co, Ni and/or Cr andX=C, N, B and Si or combinations thereof, with the exception of Si.sub.3 N.sub.4 greater than 100 nm and AlN greater than 200 nm.

Abstract: The invention relates to fine-particle oxide ceramic powders of the metal oxides MeO, whereMe=Al, Si, Zr, Hf, Ta, Nb, Mo, W, V, La and/or Y,Al.sub.2 O.sub.3 being present in the .alpha.-phase and SiO.sub.2 being present in crystalline form.

Abstract: The invention relates to a gas phase reactor for producing finely divided metal and/or ceramic powder and comprising a gas preheater, a gas-introducing part, a flow-shaping part, a reaction tube and a product discharge device.