Patent DE-102009025436-A1 (DE)
Title: Method for producing a carbon component, comprises producing a mixture of coarse-grained and/or powdery and already carbonized- carbon, activated charcoal, brown-coal coke, charcoal, soot and/or carbon fibers, with epoxide- or phenol resin
IPC: C04B35/573
Filed: 2009-06-16
Abstract: The method for producing a carbon component for the fabrication of heat exchangers, tubes, pumps or ventilator impellers, and/or other components that consist of silicon carbide after the fabrication, comprises producing a mixture of coarse-grained and/or powdery and already carbonized- carbon, activated charcoal, brown-coal coke, charcoal, soot and/or carbon fibers, with a epoxide- or phenol resin or another binding agent, producing individual base elements or total components, and compounding and adhering the base elements to a blank. The method for producing a carbon component for the fabrication of heat exchangers, tubes, pumps or ventilator impellers, and/or other components that consist of silicon carbide after the fabrication, comprises producing a mixture of coarse-grained and/or powdery and already carbonized- carbon, activated charcoal, brown-coal coke, charcoal, soot and/or carbon fibers, with a epoxide- or phenol resin or another binding agent, producing individual base elements or total components, compounding and adhering the base elements to a blank, whose form corresponds to the component to be produced, and siliconizing the compounded blank in a kiln or using the component designed as blank as a finished or semi-finished carbon component, or pressing the mixture in a mold, whose shape corresponds to the base elements to be produced or the component, or extruding the mixture for mold formation, pre-heating the base element or the component after pressing in the mold or extruding under simultaneous heating for hardening the resin binder at 70-180[deg] C to form a hardened base element or the component, and further heating the base element to be produced, or the component under inert condition at 800-1300[deg] C, where the resin binder is partially carbonized. The individual base element or complete components are produced by fabrication process. The already carbonized carbon material consists of activated charcoal, brown-coal coke, charcoal and/or soot. The component consists of adhesive mixture of powdery or grained, already carbonized carbon material and powdery and/or fluid or creamy resin binder with epoxy resin, phenol resin or another binder agent for adhering the individual element. The component emerged by adhering is subjected again to heat treatment. The blank of the base element comprises a heat exchanger, a pump- or ventilator impeller or other component and if necessary connection elements. The hardened blank of the base element or the component is mechanically processed in order to receive the final form. The porosity of the blank is adjustable after the selection of the grain of the carbon to obtain sealed or porous blanks. The silicon melts and/or evaporates and penetrates in the component or the porous blank compounded from the base elements and partially reacts with the carbon material contained in the blank to silicon carbide. The hardened body designed as blank is used as finished component such as heat exchanger. The carbonized resin binder is partially transformed into carbonized carbon during siliconizing.