Patent ID: 6953605
Filing Date: 2005-10-11
Classification: C04B,C23C,Y10S

Abstract:
1. A method of densifying porous substrates with a matrix obtained by chemical vapour infiltration using a reactive gas containing at least one gaseous precursor for the matrix material, the method comprising the steps of: loading substrates for densification in a loading zone of an oven; heating the substrates in the oven so as to raise them to a temperature at which the desired matrix material is formed from the precursor gas(es) contained in the reactive gas; admitting the reactive gas to one end of the oven; and heating the reactive gas after it has entered into the oven by passing it through a gas heating zone situated upstream from the loading zone in the flow direction of the reactive gas in the oven; wherein the reactive gas is preheated prior to entering into the oven so that on entering into the oven it is brought to an intermediate temperature between ambient temperature and the temperature to which the substrates are heated.