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Abstract

Method for treatment of workpieces of porous carbon material with liquid silicon with the formation of silicon carbide, comprising the following steps: preheating of porous carbon workpieces under an inert gas to a selected operating temperature T_B1, delivery of liquid silicon to the porous carbon workpieces at an operating pressure p_B2 and an operating temperature T_B2 and impregnation of the porous carbon workpieces with liquid silicon, reaction of the liquid silicon in the workpiece at a temperature T_B3 with formation of silicon carbide from carbon and silicon, gassing of the workpieces with inert gas, and cooling from the operating temperature T_B3 to a conditioning temperature T_k, cooling of workpieces to room temperature, in step c the delivery of silicon and transport of the workpieces taking place over preferably cylindrical rolls which are porous at least in the exterior region and which are pivoted, and their speed of rotation determining the residence time for the delivery of silicon in step c, and the temperature T_B3 being greater than or equal to the temperature T_B2, and the workpieces for process step d no longer being in contact with liquid silicon outside the workpieces.

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