Appeal No. 1997-3260
Application 08/506,153
consolidating a composite preform using heat and pressure.
Boury, in contrast, discloses a method wherein a fibrous
preform having a graduated fiber density which is highest at
the face to be exposed to high temperature is subjected to
chemical vapor infiltration to form a coating of refractory
material on the fibers until the pores at the level of the
face to be exposed to high temperature are virtually all
occupied, leaving a residual porosity which increases in the
direction of the opposite face (col. 4, line 59 - col. 5,
line 7). Heat conductive material such as silicon then is
flowed in a molten state to terminate the densification of the
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