Patent ID: 7252860
Filing Date: 2007-08-07
Classification: B32B,C04B,Y10T

Abstract:
1. In a process for producing a high temperature stable fiber composite ceramic by chemical vapor infiltration (CVI) with a methyltrichlorosilane (MTS) in hydrogen (H 2 ) on fiber scrims of carbon fiber preforms or silicon carbide fiber preforms, wherein the partial pressure ratio of hydrogen to methyltrichlorosilane is adjusted between 4 and 8, the process further comprising: adjusting the process pressure to ≧0.6 bar absolute; adjusting the process temperature to ≧1100° C.; and arranging a heat-resistant material with a large surface between a gas feed in the reaction space and the fiber scrims of carbon fiber preforms or silicon carbide fiber preforms to be infiltrated for pre-reacting the methyltrichlorosilane on contact with the large surface of the heat-resistant material, and wherein the carbon fiber preforms or silicon carbide fiber preforms are generated in that fiber layers are first constructed, the fiber layers are fixed one above the other at a distance from one another by binders and then simultaneously molding and stabilizing the preform approximating a desired end product.