Patent ID: 7763224

Claim:
A method for treating workpieces which workpieces consist of porous carbon material with liquid silicon with the formation of silicon carbide, the method comprising the steps: a) preheating porous carbon workpieces under inert gas to the selected operating temperature T B 1, b) feeding liquid silicon to the porous carbon workpieces at an operating pressure p B 2 and an operating temperature T B 2, and impregnating the porous carbon workpieces with liquid silicon, c) reacting the liquid silicon in the workpiece at a temperature T B 3 with the formation of silicon carbide, d) gassing the workpiece with inert gas and cooling from the operating temperature T B 3 to the conditioning temperature T k , and e) cooling the workpieces to room temperature, wherein the temperature T B 3 is greater than the temperature T B 2, and the workpiece in the step d is not in contact with liquid silicon outside of the workpiece.