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Porous Nicalon–alumina compacts with a bulk density of 2.32 Mg/m3 were oxidized in Ar-25%O2 gas mixture at 1373–1773 K, and subsequently they were exposed to argon at 1773 K. The mass change of compacts was thermogravimetrically determined during oxidation and exposure. The oxidized and exposed fibers were characterized through AES and XRD analysis. As the oxidation temperature increased, the oxide...
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