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 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: 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 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 carbon-graphite material with an embedded additive. So that the carbon-graphite material is distinguished by a low coefficient of friction and low wear, it is proposed that the additive is one or several synthetic mechanically resistant materials of a mean grain size between 0.1 to 10 &mgr;m.

Abstract: A novel process is described for the preparation of monodisperse ceramic ders wherein particulate oxides or hydroxides are obtained by reaction of hydrolysable compounds with water. The reaction is carried out in the presence of a complexing agent and, optionally, a stabilizer.

Abstract: A process is described for the preparation of a suspension containing sph-shaped oxide particles, in which process there is emulsified in an organic liquid an aqueous phase containing at least one element which can be precipitated as an oxide (hydrate) in dissolved form or in the form of a sol. In this process there is dissolved in this organic liquid before, during or after formation of the emulsion at least one compound which acts as a phase transfer catalyst, and which can replace the anions or cations present in the emulsified water droplets by hydroxide ions or protons and which can thereby cause precipitation of the oxide in the droplets.