A BN interphase has been deposited, by isothermal/isobaric chemical vapor infiltration (ICVI) from BF 3 ─NH 3 , within a preform made from ex‐polycarbosilane (ex‐PCS) fibers, at about 1000°C. In a second step, the BN‐treated preform was densified with SiC deposited from CH 3 SiCl 3 ─H 2 at about the...
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