Abstract: The invention relates to a process for producing a fiber composite material containing fibers with a high hot strength, in particular based on carbon, silicon, boron and/or nitrogen, a pressing compound being produced from fibers, a binder and, if appropriate, fillers and/or additives, which is then pressed in a press mold to form a green body. Various pressing compounds are produced, which contain fibers of different qualities and/or in different proportions, and the press mold is filled with the various pressing compounds in a number of successive steps. The invention also relates to a fiber composite material of this nature.

Abstract: A die provided for fixing a porous ceramic insert for producing a light metal component which is reinforced by the insert. For this purpose, the insert is positioned in the die in such a way that any force which occurs for the purpose of fixing the insert is compensated for by a collinear force, which minimizes the bending moments exerted on the insert. Furthermore, shielding elements are used to protect the insert from a casting metal flowing into the die. Furthermore, the invention describes a process in which the velocity of a casting plunger which moves the casting metal into the die is regulated in such a way that the insert is not damaged by the kinetic energy of the casting metal. This is achieved by filling the die at a low velocity until the metal has flowed around the insert. Then, the casting plunger is accelerated, thus ensuring optimum filling of the die with the casting metal.

Abstract: A reinforcing fiber, in particular for fiber composite materials, has a core which is provided with a layer of a pyrolysable binder. A coating of pyrolytic carbon or sugar is provided between the core and the layer fiber strands are provided with reinforcing fibers of this type and fiber strands are coated in this way. Fiber composite materials can be prepared with these reinforcing fibers. Processes for producing reinforcing fibers and composite materials involve coating fiber strands.

Abstract: A brake unit having a brake disc of ceramic and a hub of a different material, which radially overlap one another with their mutually facing rims and are mechanically joined by a wreath-type rim of mounting bolts that axially penetrate the overlapping rims. The mounting bolts are uniformly included in the transmission of torque. Entrainment bores or slots provided in the brake disc are plastically lined with a metal or plastic sleeve, or the disc material is formed specifically to certain areas in this region as a plastically deformable C/C structure. A method is disclosed for manufacturing a partially ceramized molded article, in particular a brake disc having a C/C structure in the area of the entrainment bores or slots. A completely non-metallic brake unit and a method for its manufacture are also disclosed.

Abstract: A method for manufacturing bodies containing reinforcing fibers includes mixing fibers, fiber bundles, or fiber agglomerates with at least one binder that can be carbonized to form a molding material; and compressing the molding material to form bodies containing reinforcing fibers with a mold having inserts. The resulting bodies have recesses with lateral edges corresponding to the inserts such that the reinforcing fibers are oriented approximately parallel to the lateral edges of the recesses.

Abstract: The invention concerns a process and a device for supercritical wet oxidation of a waste mixture containing particles comprised of organic and inorganic components. In the invention, the waste material mixture is introduced into a vessel (2), which is continuously flowed through by water in the direction counter to gravity, and that a near critical or supercritical condition exists. The flow velocity is so selected, that the particles are kept in suspension, however are not transported in the direction of flow, thereby forming a turbulence layer (30) having an upper boundary. Solids present in the water are discharged and fluid, which is located above the upper limit (32) of the turbulence layer, is continuously removed from the vessel.

Abstract: A process and a device for supercritical wet oxidation of a waste material mixture containing particles comprised of organic and inorganic components, which are suspended in water, which is raised to a near critical or supercritical condition and in this condition is passed through a pipe reactor (6). According to the invention the pipe reactor is so arranged, that the organic components substantially dissolve in water substantially without being oxidized. The output products of the pipe reactor are caused to pass through a second reactor (8) in the near or supercritical condition, which has a substantially smaller ratio of internal surface area to volume than the pipe reactor and is so arranged that the organic components are substantially completely oxidized therein.

Abstract: A process for producing bodies made of fiber-reinforced composites from fiber-reinforced precursor bodies having a porous carbon matrix, in particular from C/C bodies, includes (1) mixing fibers, fiber bundles or fiber agglomerates based on carbon, nitrogen, boron and/or silicon with at least one carbonizable binder to give a pressing composition, and (2) pressing the pressing composition to form a green body. At least one metal- or silicon-containing core is added to the green body. The green body is subsequently pyrolysed to convert the binder or binders into a porous carbon matrix, and the resulting fiber-reinforced precursor body is infiltrated with molten metal or silicon from the metal- or silicon-containing core.

Abstract: The invention relates to a brake unit (1) having a brake disc (2) of ceramic and a hub (10, 10′) of a different material, which radially overlap one another with their mutually facing rims and are mechanically joined by a wreath-type rim of mounting bolts (15) that axially penetrate the overlapping rims. Provision is made according to the present invention for the mounting bolts (15) to be uniformly included in the transmission of torque. For this, entrainment bores (5, 5′) or entrainment slots provided in the brake disc (2) are plastically lined according to the present invention with a metal or plastic sleeve (20), or the disc material is formed specifically to certain areas in this region (34) as a plastically deformable C/C structure. The invention relates furthermore to a method for manufacturing a partially ceramized molded article, in particular a brake disc (2) having a C/C structure in the area of the entrainment bores (5, 5′) or entrainment slots.

Abstract: A brake unit comprising at least one brake and at least one brake pad having at least one friction lining is described. The brake has a disk brake with a brake rotor made of a ceramic-metal composite (CMC) whose outer surface or surfaces at least partially form a friction surface for the at least one friction lining, and a disk brake cup that is mounted on the disk brake by way of one or more mounting elements. The friction surface of the disk brake has a hardness of approximately 1600 to 2500 HV, and the at least one friction lining has a coefficient of friction of approximately 0.3 to 0.5. The disk brake cup and/or the mounting elements form a corrosion-inhibiting attachment to the disk brake. The brake unit can be operated in corrosion-free fashion over a service life of at least approximately eight to 10 years or approximately 200,000 to 300,000 km.

Abstract: A brake unit including a brake disc of a material having a high thermal loading capacity and a brake pad that cooperates with it in tribological fashion. The brake disc is essentially made of a short-fiber reinforced ceramic material, whose thermal conductivity, in particular transversely to the disc surface, is at least 20 W/mK, preferably about 30 to 45 W/mK. The brake disc is combined with a brake pad having an organically bonded matrix. The brake pad may be a conventional series brake pad. The brake unit provides an optimal pairing of a brake disc, having a high thermal loading capacity, with a conventional brake pad in light of a reasonably expected brake pad service life, and in light of other tribological requirements, such as the friction coefficient.

Abstract: A brake unit having a brake disc of ceramic and a hub of a different material, which radially overlap one another with their mutually facing rims and are mechanically joined by a wreath-type rim of mounting bolts that axially penetrate the overlapping rims. The mounting bolts are uniformly included in the transmission of torque. Entrainment bores or slots provided in the brake disc are plastically lined with a metal or plastic sleeve, or the disc material is formed specifically to certain areas in this region as a plastically deformable C/C structure. A method is disclosed for manufacturing a partially ceramized molded article, in particular a brake disc having a C/C structure in the area of the entrainment bores or slots. A completely non-metallic brake unit and a method for its manufacture are also disclosed.

Abstract: A brake unit includes a brake disc of a ceramic material and a brake pad that cooperates with it in tribological fashion. The brake pad is made of a sintered metal material or of an inorganically bound material having a ceramic binding phase and metal particles. The brake unit has a high thermal loading capacity, very good performance characteristics in terms of comfort, and an acceptable service life.

Abstract: A ceramic composite includes (a) 30 to 60% by volume of C-fibers; (b) 10 to 55% by volume of a matrix made of SiC and C, wherein the weight ratio SiC:C is in the range of between 20:1 and 2:1; (c) 5 to 40% by volume porosity that may be open or closed. A base material is formed from a)+b)+c).

Abstract: A process for manufacturing a brake lining made of a fiber-reinforced ceramic C/SiC material includes (1) producing a carbon fiber body having at least one of a defined volume of pores and capillaries; (2) infiltrating the carbon fiber body with at least one of carbon or a carbon precursor; (3) pressing the infiltrated carbon fiber body, thereby forming a green compact; (4) pyrolyzing the green compact, thereby forming a porous C/C body; (5) adjusting at least one of a pore and a capillary volume of the porous C/C body to maximally approximately 60% by volume; and (6) infiltrating the C/C body with liquid silicon so that carbon, at least in an area of pores and capillaries which is close to the surface, becomes silicon carbide.

Abstract: A method for manufacturing coated short fibers, in which the short fibers are coated in a reactor with at least one coating agent. The method includes exposing a short fiber bundle having a coating or a plastic matrix to a high-frequency field which dissolves the coating or the plastic matrix. The fiber bundle is separated into individual fibers and are coated by chemical vapor deposition on all sides by at least one coating agent present in a gas phase. A combination of mechanical and microwave treatment is preferably provided to loosen the short fiber bundles.

Abstract: A brake unit includes a brake disk made of a fiber-reinforced ceramic C/SiC composite and a brake lining tribologically interacting with this brake disk. The brake lining comprises the same material as the brake disk, in which case, at least in the area of the brake lining close to the surface, the hardness is lower than that of the brake disk. The brake unit exhibits a high stability to temperature while the wear is low and the service life is acceptable.