Abstract: The invention relates to a method for producing a product, to a crucible and to the use of a layer of crystalline silicon nitride, the product being formed from a material consisting mainly of carbon or of a ceramic material, the product being coated with surface layer by chemical vapor deposition (CVD), wherein the product is coated with a surface layer of at least semi-crystalline, preferably crystalline silicon nitride (Si3N4), the surface layer being formed on the product at a process temperature of more than 1100° C. to 1700° C.

Abstract: A method for forming a hydrophilic surface on a graphite-containing material. The surface to be rendered hydrophilic is irradiated with a pulsed laser having a power density of at least 0.5 MW/mm2. A bipolar plate, for example, may be rendered hydrophilic in part-regions of its surface in a simple manner and with a low outlay in terms of apparatus.

Abstract: A method for producing a high-temperature includes forming a dimensionally stable green body of the high-temperature component from a matrix material and pyrolizing the matrix material. A material mixture of the matrix material with a carbon material is used to form the high-temperature component, and a thermoplastic is used as the matrix material. The green body is formed by additive manufacturing.

Abstract: A method and a device for joining a reinforcement sleeve onto a rotor of an electric motor. The method includes providing the reinforcement sleeve and the rotor, the reinforcement sleeve has a cylindrical inner periphery which is undersized with respect to a cylindrical outer periphery of the rotor; attaching at least two vacuum cups onto an outer lateral surface of the reinforcement sleeve, such that the vacuum cups adhere to the outer lateral surface of the reinforcement sleeve in a reversibly detachable manner on account of a vacuum generated between the vacuum cup and the outer lateral surface; and joining the reinforcement sleeve onto the rotor, in that the rotor is pressed into the reinforcement sleeve in a pressing direction.

Abstract: A process for producing a molded part from a highly filled thermosetting starting material including: introducing the starting material into a prepressing tool; producing a preform from the starting material, the starting material being brought to a prepressing temperature by the prepressing tool and being compressed with a prepressing force to form the preform; removing the preform from the prepressing tool and introducing the preform into a finish pressing tool; and producing a finished part from the preform, the preform being brought to a finish pressing temperature by the finish pressing tool and being compressed with a finish pressing force to form the finished part. Here, the prepressing temperature is lower than the finish pressing temperature and the finish pressing temperature is at least as high as an onset temperature of a curing reaction of the starting material.

Abstract: A metering device (10) for withdrawing and dispensing a melt consisting of or containing an oxide fibre reinforced oxide ceramic composite material.

Abstract: The invention relates to a tribological body (10) comprising a body with a sliding surface (12) and at least one hollow space through which a fluid can flow. The body (10) consists of a first monolithic partial body (14) comprising the sliding surface (12) and of a second monolithic partial body (16) connected to the first one, wherein the hollow space is designed as a conduit (20) which runs at least in sections inside the second partial body and is delimited from the latter at least on the bottom side and the side surface sides.

Abstract: The invention relates to a pressure relief device and to a method for producing a pressure relief device, the pressure relief device (10) comprising a rupture disc (11) and a vacuum support (12, 32), the rupture disc and the vacuum support being made of graphite, the one-piece rupture disc having an exit side (13) and an entry side (14), the rupture disc having a recess (15) on the entry side, said recess (15, 33) forming a rupture area (17) within a retainer (16) of the rupture disc, the vacuum support being inserted in the recess, the pressure relief device having a carbon retaining device (30) for a form-fitted fastening of the vacuum support in the recess.

Abstract: The invention relates to a tube furnace device for an atomizing furnace and to an analyzing apparatus comprising an atomizing furnace and a tube furnace device, in particular for atomic absorption spectrometry, the tube furnace device comprising a sample carrier means (11) and a bearing means (12) for supporting and forming electrical contact with the sample carrier means, the sample carrier means having a receiving tube (16) forming a tubular receiving space (17) for receiving an analyte, the sample carrier means having two bearing protrusions on the receiving tube for forming a connection with the bearing means, the bearing protrusions extending perpendicularly, preferably orthogonally, in relation to a longitudinal axis of the receiving tube, wherein the tube furnace device has a contact pressure means (13) via which a contact pressure force (14) can be exerted on the bearing protrusions in the direction of a passant line (20) in relation to a circular cross section (21) of the receiving tube.

Abstract: A heating chamber (1) for a heating furnace is proposed, with which electrothermal vaporization of impurities from samples can be effected in order to be able to then analyze them spectrometrically. The heating chamber has a wall (3), a sample reception area (5), a nozzle area (7) and two electrical connection areas (9, 11). The heating chamber (1) is specially configured such that an electric current flows through the wall (3) in such a way that a heating capacity caused by it is higher in the nozzle area (7) than in the sample reception area (5).

Abstract: The invention relates to a method for producing a latent heat accumulator of expanded graphite by expanding a graphitic starting material. The invention is characterized in that the graphitic starting material is introduced into a mold which corresponds at least in sections to the negative mold of the latent heat accumulator, and that the graphitic starting material is subsequently expanded in the closed mold.

Abstract: The invention relates to a method for producing a casting mold as well as to a casting mold (10), in particular a continuous casting mold or similar. Said casting mold is made of a material which is essentially made of carbon and the casting mold is coated with pyrolytic carbon and/or boron nitride.

Abstract: The invention relates to a tribological body (10) comprising a body with a sliding surface (12) and at least one hollow space through which a fluid can flow. The body (10) consists of a first monolithic partial body (14) comprising the sliding surface (12) and of a second monolithic partial body (16) connected to the first one, wherein the hollow space is designed as a conduit (20) which runs at least in sections inside the second partial body and is delimited from the latter at least on the bottom side and the side surface sides.

Abstract: The invention relates to a method for producing a latent heat accumulator of expanded graphite by expanding a graphitic starting material. The invention is characterized in that the graphitic starting material is introduced into a mold which corresponds at least in sections to the negative mold of the latent heat accumulator, and that the graphitic starting material is subsequently expanded in the closed mold.

Abstract: A heating chamber (1) for a heating furnace is proposed, with which electrothermal vaporization of impurities from samples can be effected in order to be able to then analyze them spectrometrically. The heating chamber has a wall (3), a sample reception area (5), a nozzle area (7) and two electrical connection areas (9, 11). The heating chamber (1) is specially configured such that an electric current flows through the wall (3) in such a way that a heating capacity caused by it is higher in the nozzle area (7) than in the sample reception area (5).

Abstract: The invention relates to a method for producing a molded body, having a silicon carbide support matrix and an integral carbon structure, wherein a base body on the basis of a powder mixture containing silicon carbide or silicon and carbon and of a binder is built in layers in a generative method, and wherein a pyrolysis of the base body is effected for realizing the molded body after the binder has been cured, wherein the carbon content of the carbon structure is adjusted by way of the pyrolysis of the binder and by way of the carbon content of the powder mixture or infiltration of a carbon material into the silicon carbide support matrix.

Abstract: The invention relates to a method for producing a composite body and to a composite body produced using the method, wherein the composite body (10) is formed as a pressure pipe or as a pressure container, wherein the composite body is composed of a main body (13) that is made of steel and of a coat (14) that is made of a fiber composite (15), said coat enclosing the outside of the main body at least in some sections, wherein, for forming the fiber composite, a fibrous material is wound around the main body, wherein the fibrous material is impregnated with a resin before or after winding, wherein the wound and impregnated fibrous material is heated in order to form the fiber composite, wherein the method is carried out in situ on a built-in pressure pipe or pressure container, wherein the wound and impregnated fibrous material is heated to up to 700° C.

Abstract: The invention relates to a carbon brush (2), having a wear limit indicating function, having a current-carrying stranded wire being arranged in the brush body (4), and having a stranded indicating wire (10), which, at a stranded wire end section (12), is surrounded and fixed by a sleeve (8) having an infeed opening (22), wherein the sleeve (8) is arranged in a recess (6) being formed in the brush body (4). The sleeve (8) is formed as a centering sleeve, the inner diameter (26a, 26b) of which at the infeed opening (22) nearly corresponds to the outer diameter (24) and features a tapering (30) that is conical in the infeed direction.

Abstract: In an apparatus for the continuous thermal treatment of metal continuously cast material having a heating section, the metal continuously cast material having a heating section, the metal continuously cast material is led over two contact rollers, wherein the first contact roller is arranged at a first end and the second contact roller is arranged at a second end of said heating section. Both contact rollers are connected to a voltage source in such a way that a current flows through the metal continuously cast material between the first and the second contact roller. Here, electrical contact is made with one of the contact rollers via a sliding contact element, which is in electrical contact with a slip-ring disk arranged concentrically with the axis of said contact roller. The sliding contact element is arranged on a current-carrying element using a plug-in connection which can be detached by pulling and which has at least one resilient and electrically conductive fixing element.