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The initial stage of oxidation process of HfB 2 –20 vol.% SiC composite at 1500°C in air was investigated. With no holding, the oxide scale is composed of a discontinuous SiO 2 -rich glass layer and an imperfect SiC-depleted layer. Detailed analysis showed that the imperfect SiC-depleted layer contained an HfB 2 matrix with partially oxidized HfB 2 and SiC particles...
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