Method for densifying porous substrates by chemical vapour...

Details Method for densifying porous substrates by chemical vapour... Method for densifying porous substrates by chemical vapour...

2005-10-11

2005-10-11

Chen, Bret (Department: 1762)

Coating processes

Coating by vapor, gas, or smoke

C427S900000

Reexamination Certificate

active

06953605

ABSTRACT:
A method for densification of porous by CVI in which substrates are loaded into a loading zone of an oven and heated to a temperature at which a desired matrix material is formed from a precursor gas(es). A reative gas containing the precursor gas(es) is admitted into the end of the oven and heated upstream from the loading zone of the substrates. The reactive gas is also preheated prior to entering the oven so that, upon entering the oven, it is brought to an intermediate temperature between ambient temperature and the temperature to which the substrates are heated. In this manner, a very small temperature gradient is obtained throughout the loading zone.

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