The resistance of tial coupons to cyclic oxidation at 1300 k in a flow of purified oxygen under atmospheric pressure has been significantly improved by preoxidation. the preoxidation was performed by heating the specimen, buried in a silica powder and encapsulated in a silica tube under a vacuum of 1.3 x 10-3' PA AT 1200 K FOR 100 KS. AFTER 20 CYCLES (400HR) OF OXIDATION THE MASS GAIN WAS STILL ...
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