Abstract: A threaded connection is secured against loosening/unscrewing for columns of carbon and/or graphite electrodes. The electrodes are connected in columns with threaded connection elements, i.e., carbon connecting pins. At least one part has a wedge ramp on the root of the thread winding. When the components of the threaded connection are screwed together, the crests of the thread windings of one part abut with the wedge ramps of the other threaded connection component. A contact line is created, possibly multiple sections of a contact line. When the parts are screwed together, all forces are transferred from one part to the other only via the contact line. In a special case, the contour of the thread winding along whose root the wedge ramp is running is reduced e.g. to a connecting line between two wedge ramps located one above the other in the cross-section.

Abstract: A pair of sliding elements for machine parts exposed to high-pressure and high-temperature steam, preferably piston-cylinder arrangements for steam engines. The first sliding element is produced from a synthetic, fired but not graphitized carbon material which comprises graphitized carbon black and/or natural graphite as significant filler and whose pores are filled with metal, metal alloy, a ceramic, synthetic resin and/or pitch which has been carbonized, preferably in the form of a piston and/or piston ring. The second sliding element, preferably in the form of a cylinder liner or guide bush, comprising an iron-containing, high-temperature-resistant material which is preferably alloyed with chromium and/or nickel and is provided at least on the surface layer with a nitride layer.

Abstract: Process for a fiber-reinforced ceramic material whose reinforcing fibers are present in the form of at least one of woven fabrics, short fibers and long fibers, wherein the mass ratio of the fibers in the form of woven fabrics, short fibers and long fibers is 0-35:25-80:0-45 and at least a part of the reinforcing fibers has at least one protective layer of carbon produced by pyrolysis of resins or pitches, boron compounds or phosphorus compounds or combinations thereof which have been deposited thereon, a process for producing it and its use as material for brake linings

Abstract: Friction members are composed of a ceramic composite material. The friction members can be used for motor vehicles as a clutch disk for friction clutches, for transmitting motive power, or as a brake disk. A friction zone of the friction member is composed of ceramic, in particular of Si and SiC. A core zone of the friction member is made from fiber-reinforced C/SiC, in particular of long fiber woven fabric-reinforced and short fiber-reinforced C/SiC.

Abstract: Electrode columns made from carbon and graphite are screwed together from individual elements, for example, the electrodes and nipples. The elements have directionally structured contact surfaces. Such a structure of the contact surfaces gives rise to the elements of a column demonstrating increased resistance to loosening after intensive machine screwing or screwing applied by hand, which, therefore, is often inadequate, whereby a higher level of operational reliability is achieved, in particular, in the case of electrode columns that are screwed together by hand.

Abstract: The invention comprises, in one form thereof, a continuous processing apparatus for high temperature thermal treatment of granular materials. The apparatus includes a vertical conveyor means with an internal feed mechanism for transporting granular feedstock upward, an external export means for taking reacted product downward wherein said internal feed heats said granular feedstock by absorbing heat from the product flowing downward through said export means, and a heating means disposed around a top portion of said vertical conveyor means and said external export means.

Abstract: A method is provided for producing a fiber-reinforced material which is composed, at least in a region of a surface layer, of a ceramic composite and has carbon-containing fibers reaction-bonded to a matrix containing the elements Si and C. In particular a method of producing fiber-reinforced silicon carbide is provided in which a structure of a matrix contains cracks and/or pores, at least at ambient temperature, because of a high thermal expansion coefficient compared with that of the fibers. Metals are selectively electrodeposited in the open pores and cracks of the matrix and, in particular, in a region of the electrically conductive reinforcing fibers. As a result, the open pores and cracks are filled and, in addition, metallic top layers are optionally formed that are firmly keyed to the ceramic composite and that may serve as an interlayer for glass top layers or ceramic top layers.

Abstract: The present invention relates to shaped bodies made of fiber-reinforced ceramic composites and comprising a core zone and at least one covering layer which has a coefficient of thermal expansion which is higher than that of the core zone. The covering layer is an SiC-rich covering layer and is divided into segments which are separated from the adjacent segments by gaps or bridging zones of a material which is different from the material of the segments. The invention also relates to a process for producing such shaped bodies by infiltration of an intermediate body with molten silicon and their use for friction disks, in vehicle construction or as protective plates.

Abstract: This invention relates to a process and a device for producing components and semi-finished products from synthetic graphite or from ceramic granules, in particular for producing graphite tubes, involving shaping of a material to be mixed preferably containing petroleum coke or graphite granules, by means of an extrusion press (22) or an extruder, wherein the process provides the following steps: a) Pre-pressing the material (20) to be mixed in static or quasi-static manner, flow movements of the material (20) to be mixed being stopped or impeded in such a way that particles previously irregularly arranged in the material to be mixed are initially aligned transversely to the direction of pressing, b) Pressing out of the pre-pressed material (20) to be mixed through an outlet opening (28) of the extrusion press (22) or the extruder in such a way that owing to adjusted flow properties of the material (20) to be mixed, the particles within the pre-compressed material (20) to be mixed realign, starting from thei

Abstract: Frictional pairing in motor vehicles, including a carbon-ceramic brake disk or a grey cast iron brake disk and a brake pad for the brake caliper of the parking brake, characterised in that the brake pad comprises a fiber-reinforced ceramic composite material, which has a matrix with phases of silicon carbide and reinforcement fibers of carbon, graphite, silicon carbide or whiskers of high-melting metals with a melting temperature of over 1500° C.

Abstract: Internally ventilated brake disk in the form of a circular ring disk with cooling channels in the interior of the disk which extend, respectively, from the inner circumference to the outer circumference of the circular ring disk, wherein the channel cross section and the channel course within the brake disk as well as the branching of the channels is designed such that the cooling effect by means of air flow is as efficient as possible

Abstract: Friction pairing for clutch systems of two materials in which one of the materials is a fiber-reinforced ceramic or metallic material A which comprises reinforcing fibers comprising carbon or ceramic fibers or whiskers, and the material B acting against the material A in the friction pairing is selected from the group consisting of ceramic materials B11 and metallic materials B12, sintered metals B2, sintered oxidic ceramics B3, sintered nitridic ceramics B4, sintered carbidic ceramics B5 and organic sintered materials B6, processes for producing it and its use in clutch systems

Abstract: Clutch linings comprising fiber-reinforced ceramic materials which contain short carbon fibers and whose matrix has a mass fraction of at least 40% of silicon carbide, process for producing them and their use in clutch systems, in particular for motor vehicles

Abstract: Clutch linings comprising fiber-reinforced ceramic materials which comprise carbon fibers and whose matrix material is selected from among inorganic polymers, oxidic ceramics, set cements, organoelement polymers and finely divided inorganic solids which are held together by an inorganic or organic binder

Abstract: An electrode connection includes coated contact surfaces in differently constructed electrode strings formed of carbon and graphite being provided with sliding layers. With the aid of these sliding layers, the elements of a string can be screwed more firmly against one another, with the result that a higher release torque and higher operating reliability are achieved.

Abstract: Friction bodies comprising a fiber-reinforced porous carbon material in which the reinforcing fibers are present in the form of woven fabrics, short fibers and/or long fibers and whose pores are filled with metals, wherein carbides of the metals filling the pores are present in the material in a mass fraction of not more than 10%, a process for their production and the use thereof in brake and clutch systems

Abstract: Fiber-reinforced ceramic composites contain bundles, tows or hanks of long fibers, wherein the long fiber bundles, tows or hanks are completely surrounded by a short fiber-reinforced matrix, with the long and short fibers having, independently of one another, a mean diameter of from 4 to 12 &mgr;m and the long fibers having a mean length of at least 50 mm and the short fibers having a mean length of not more than 40 mm, a process for producing them and their use for producing clutch disks or brake disks.

Abstract: In order to pull semiconductor single crystals by the Czochralski method, quartz glass crucibles are used which require support crucibles having high temperature capabilities. Such support crucibles may be made of various materials, in which case graphite materials, carbon fiber-reinforced carbon (CFC), combinations thereof or carbon materials coated with silicon carbide (SiC) are used. The working life of a CFC support crucible can be extended by a partial thickening of the support crucible walls affected by corrosion processes.

Abstract: Fiber-reinforced ceramic composites which comprise at least two layers of a multidirectional woven fiber fabric as reinforcement, with at least 5% of the area of each layer of woven fiber fabric being permeated by matrix material, friction disks comprising these composites as core zone or support zone, a process for producing them and their use as brake disks or clutch disks.

Abstract: A flat gasket for flange connections has a leakage rate below the limit value of 1*10−5 kPa*1/(s*m). The gasket assembly has a thick, areal, pressure-resistant core formed from at least one layer of graphite foil with a base weight of at most 1500 g/m2, or a multilayer sandwich of such graphite foils and metal interlayers. The core is embedded between two metal foils, and the surfaces that are remote from the core are covered by covering layers of graphite foil with a base weight of at most 350 g/m2. A ratio of the base weight of the graphite foil of the covering layers to the base weight of the graphite foil of the core lies between 1:3 and 1:7.