Method of making carbon fibre reinforced ceramified shaped body and use of such a shaped body

摘要

Silicon is infiltrated into the moulded body to increase its mechanical strength. - Production of a moulded body reinforced with carbon fibres comprises infiltrating a porous carbon fibres containing preform of the moulded body made of polymer resin based on phenol and hardening, pyrolysing the green body obtained to convert the polymer resin into carbon into which silicon, preferably in liquid form, is infiltrated at 1400[deg]C. Before pyrolysis, the preform infiltrated with polymer resin is heated to a heat treatment temperature which is 20-70[deg]C above the temperature at which the polymer resin hardens. The heat treatment temperature is maintained for at least one hour and then the green body is cooled to room temperature at a rate >= 30[deg]C/hour. During pyrolysis, the green body is subjected to mechanical pressure which increases with increasing green body thickness. After the pyrolysis has ceased, the green body is cooled to room temperature at a rate of 30-300[deg]C/hour.